WorldWideScience

Sample records for 111-5 magnetic separator

  1. Magnetic separator

    OpenAIRE

    Křupka, Jiří

    2015-01-01

    Cílem bakalářské práce je návrh konstrukčního řešení magnetického separátoru určeného k separaci drobného průmyslového odpadu. Tato zpráva obsahuje přehled zařízení světových výrobců, která slouží k magnetické separaci ocelového odpadu. Dále pak posouzení variant technických řešení konstrukčních uzlů magnetického separátoru a následný výběr konkrétního řešení. Dle vstupních parametrů jsou vypočteny všechny parametry potřebné ke správnému návrhu stroje. Ve výpočtech jsou zahrnuty i odůvodnění ...

  2. Magnetic Separation in Romania

    OpenAIRE

    Rezlescu, Nicolae; Bradu, Elena-Brandusa; Iacob, Gheorghe; Badescu, Vasile; Iacob, Lavinia

    1986-01-01

    The utilization of the magnetic separators of foreign and Romanian source is presented and the most important achievements in research, engineering design and manufacturing activity concerning the magnetic separation in Romania are reviewed.

  3. Magnetic Separation in Czechoslovakia

    OpenAIRE

    Hencl, Vladimir

    1991-01-01

    The use of magnetic separation in various mineral processing facilities in Czechoslovakia is described. The manufacture of assorted types of magnetic separation machines is highlighted. Potential applications and research and development activities are discussed.

  4. Magnetic separation of algae

    Energy Technology Data Exchange (ETDEWEB)

    Nath, Pulak; Twary, Scott N.

    2016-04-26

    Described herein are methods and systems for harvesting, collecting, separating and/or dewatering algae using iron based salts combined with a magnetic field gradient to separate algae from an aqueous solution.

  5. High gradient magnetic separation

    International Nuclear Information System (INIS)

    In a process in which magnetic material is trapped in a filter disposed in a magnetic field, and is unloaded by passing a fluid through the filter in the absence of the initial magnetic field, the magnetic field is first reduced to an intermediate value to allow unloading of the more weakly magnetic particles, the more strongly magnetic particles being retained and subsequently unloaded by further reduction of the magnetic field. Stage by stage reduction of the magnetic field during unloading allows separation of different species from the mixture. As an example the method can be applied to the separation of uranium compounds from mine ores. The uranium compounds are magnetic, while most of the other constituents of the ore are non-magnetic. The starting material is a suspension of the ore. Water is used for unloading. The filter material in this case is stainless steel balls. (author)

  6. USE OF SUPERCONDUCTING MAGNETS IN MAGNETIC SEPARATION

    OpenAIRE

    Parker, M.

    1984-01-01

    A review is given assessing the potential for superconducting high-field magnet systems in magnetic separation. Particular attention is given to the advantages of the reciprocating canister approach to high gradient magnetic separation and to the use of quadrupole magnets in open gradient magnetic separation.

  7. Magnetic separation in microfluidic systems

    OpenAIRE

    Smistrup, Kristian; Hansen, Mikkel Fougt; Bruus, Henrik; Tang, Peter Torben; Kruhne, Ulrich Willi Walter

    2007-01-01

    This Ph.D. thesis presents theory, modeling, design, fabrication, experiments and results for microfluidic magnetic separators. A model for magnetic bead movement in a microfluidic channel is presented, and the limits of the model are discussed. The effective magnetic field gradient is defined, and it is argued that it is a good measure, when comparing the performance of magnetic bead separators. It is described how numeric modelling is used to aid the design of microfluidic magnetic separati...

  8. Magnetic separation in microfluidic systems

    DEFF Research Database (Denmark)

    Smistrup, Kristian

    2007-01-01

    This Ph.D. thesis presents theory, modeling, design, fabrication, experiments and results for microfluidic magnetic separators. A model for magnetic bead movement in a microfluidic channel is presented, and the limits of the model are discussed. The effective magnetic field gradient is defined......, and it is argued that it is a good measure, when comparing the performance of magnetic bead separators. It is described how numeric modelling is used to aid the design of microfluidic magnetic separation systems. An example of a design optimization study is given. A robust fabrication scheme has been developed...... for fabrication of silicon based systems. This fabrication scheme is explained, and it is shown how, it is applied with variations for several designs of magnetic separators. An experimental setup for magnetic separation experiments has been developed. It has been coupled with an image analysis program...

  9. Magnetic Separation in South Africa

    OpenAIRE

    Corrans, Ian James; Svoboda, Jan

    1985-01-01

    The use of magnetic separators in the various mineral processing facilities in South Africa is described. A large number are used to recover medium in dense medium plants. The manufacture of various types of magnetic separation machines by three local suppliers is highlighted. The potential use of highgradient and/or high–intensity magnetic separation in the recovery of gold, uranium, and phosphate minerals is discussed.

  10. Magnetic separation for soil decontamination

    International Nuclear Information System (INIS)

    High gradient magnetic separation (HGMS) is a physical separation process that is used to extract magnetic particles from mixtures. The technology is used on a large scale in the kaolin clay industry to whiten or brighten kaolin clay and increase its value. Because all uranium and plutonium compounds are slightly magnetic, HGMS can be used to separate these contaminants from non-magnetic soils. A Cooperative Research and Development Agreement (CRADA) was signed in 1992 between Los Alamos National Laboratory (LANL) and Lockheed Environmental Systems and Technologies Company (LESAT) to develop HGMS for soil decontamination. This paper reports progress and describes the HGMS technology

  11. Continuous magnetic separator and process

    Science.gov (United States)

    Oder, Robin R.; Jamison, Russell E.

    2008-04-22

    A continuous magnetic separator and process for separating a slurry comprising magnetic particles into a clarified stream and a thickened stream. The separator has a container with a slurry inlet, an overflow outlet for the discharge of the clarified slurry stream, and an underflow outlet for the discharge of a thickened slurry stream. Magnetic particles in the slurry are attracted to, and slide down, magnetic rods within the container. The slurry is thus separated into magnetic concentrate and clarified slurry. Flow control means can be used to control the ratio of the rate of magnetic concentrate to the rate of clarified slurry. Feed control means can be used to control the rate of slurry feed to the slurry inlet.

  12. Magnetic separation for environmental remediation

    International Nuclear Information System (INIS)

    High Gradient Magnetic Separation (HGMS) is a form of magnetic separation used to separate solids from other solids, liquids or gases. HGMS uses large magnetic field gradients to separate ferromagnetic and paramagnetic particles from diamagnetic host materials. The technology relies only on physical properties, and therefore separations can be achieved while producing a minimum of secondary waste. Actinide and fission product wastes within the DOE weapons complex pose challenging problems for environmental remediation. Because the majority of actinide complexes and many fission products are paramagnetic, while most host materials are diamagnetic, HGMS can be used to concentrate the contaminants into a low volume waste stream. The authors are currently developing HGMS for applications to soil decontamination, liquid waste treatment, underground storage tank waste treatment, and actinide chemical processing residue concentration. Application of HGMS usually involves passing a slurry of the contaminated mixture through a magnetized volume. Field gradients are produced in the magnetized volume by a ferromagnetic matrix material, such as steel wool, expanded metal, iron shot, or nickel foam. The matrix fibers become trapping sites for ferromagnetic and paramagnetic particles in the host material. The particles with a positive susceptibility are attracted toward an increasing magnetic field gradient and can be extracted from diamagnetic particles, which react in the opposite direction, moving away from the areas of high field gradients. The extracted paramagnetic contaminants are flushed from the matrix fibers when the magnetic field is reduced to zero or when the matrix canister is removed from the magnetic field. Results are discussed for the removal of uranium trioxide from water, PuO2, U, and Pu from various soils (Fernald, Nevada Test Site), and the waste water treatment of Pu and Am isotopes using HGMS

  13. Magnetic separation for environmental remediation

    Energy Technology Data Exchange (ETDEWEB)

    Schake, A.R.; Avens, L.R.; Hill, D.D.; Padilla, D.D.; Prenger, F.C.; Romero, D.A.; Worl, L.A. [Los Alamos National Lab., NM (United States); Tolt, T.L. [Lockheed Environmental Systems and Technologies Co., Las Vegas, NV (United States)

    1994-11-01

    High Gradient Magnetic Separation (HGMS) is a form of magnetic separation used to separate solids from other solids, liquids or gases. HGMS uses large magnetic field gradients to separate ferromagnetic and paramagnetic particles from diamagnetic host materials. The technology relies only on physical properties, and therefore separations can be achieved while producing a minimum of secondary waste. Actinide and fission product wastes within the DOE weapons complex pose challenging problems for environmental remediation. Because the majority of actinide complexes and many fission products are paramagnetic, while most host materials are diamagnetic, HGMS can be used to concentrate the contaminants into a low volume waste stream. The authors are currently developing HGMS for applications to soil decontamination, liquid waste treatment, underground storage tank waste treatment, and actinide chemical processing residue concentration. Application of HGMS usually involves passing a slurry of the contaminated mixture through a magnetized volume. Field gradients are produced in the magnetized volume by a ferromagnetic matrix material, such as steel wool, expanded metal, iron shot, or nickel foam. The matrix fibers become trapping sites for ferromagnetic and paramagnetic particles in the host material. The particles with a positive susceptibility are attracted toward an increasing magnetic field gradient and can be extracted from diamagnetic particles, which react in the opposite direction, moving away from the areas of high field gradients. The extracted paramagnetic contaminants are flushed from the matrix fibers when the magnetic field is reduced to zero or when the matrix canister is removed from the magnetic field. Results are discussed for the removal of uranium trioxide from water, PuO{sub 2}, U, and Pu from various soils (Fernald, Nevada Test Site), and the waste water treatment of Pu and Am isotopes using HGMS.

  14. Magnetic separation apparatus and methods

    NARCIS (Netherlands)

    Tibbe, Arjan; Scholtens, Tycho M.; Terstappen, Leon W.M.M.

    2010-01-01

    Apparatuses and methods for separating, immobilizing, and quantifying biological substances from within a fluid medium. Biological substances are observed by employing a vessel (6) having a chamber therein, the vessel comprising a transparent collection wall (5). A high internal gradient magnetic ca

  15. The Physical Model of Magnetic Separation in a Plate Separator

    OpenAIRE

    Brożek, M.

    1999-01-01

    The results of magnetic separation depend on many factors, such as physical properties of particles of the separated mixture, magnetic intensity, particle sizes, separation conditions (constant or alternating field, dry or wet separation) and others. The formulae representing the dependence of separation results on the above mentioned factors are obtained from the model. The mathematical model presents only some general dependences of separations results on time or length of the separation pa...

  16. Recent Activities in Magnetic Separation in Sweden

    OpenAIRE

    Wang, Yanmin; Forssberg, Eric

    1995-01-01

    This paper describes some industrial applications of magnetic separation in Swedish mineral industry. Recent studies on magnetic treatment of minerals in Sweden are also presented. These studies involve selectivity of wet magnetic separation, wet magnetic recovery of mineral fines and ultrafines, sulphide processing by magnetic means, as well as dry magnetic purification of industrial minerals.

  17. Method of magnetic separation and apparatus therefore

    Science.gov (United States)

    Oder, Robin R. (Inventor)

    1991-01-01

    An apparatus for magnetically separating and collecting particulate matter fractions of a raw sample according to relative magnetic susceptibilities of each fraction so collected is disclosed. The separation apparatus includes a splitter which is used in conjunction with a magnetic separator for achieving the desired fractionation.

  18. Magnetic Separator Enhances Treatment Possibilities

    Science.gov (United States)

    2008-01-01

    Since the earliest missions in space, NASA specialists have performed experiments in low gravity. Protein crystal growth, cell and tissue cultures, and separation technologies such as electrophoresis and magnetophoresis have been studied on Apollo 14, Apollo 16, STS-107, and many other missions. Electrophoresis and magnetophoresis, respectively, are processes that separate substances based on the electrical charge and magnetic field of a molecule or particle. Electrophoresis has been studied on over a dozen space shuttle flights, leading to developments in electrokinetics, which analyzes the effects of electric fields on mass transport (atoms, molecules, and particles) in fluids. Further studies in microgravity will continue to improve these techniques, which researchers use to extract cells for various medical treatments and research.

  19. Application of Superconducting Magnets to Magnetic Separation. Some Selected Aspects.

    OpenAIRE

    Cieśla, Antoni

    1992-01-01

    One of the possible magnetic separation processes, the highgradient magnetic separation, is analysed. Mathematical model of separation for two alternative constructions, namely deflecting and matrix separators, is presented. The model enables the efficiency of separation to be analysed as a function of selected parameters. The performance of the matrix separator, as well as the phenomena that take place during the matrix replacement are described. Computed values of the magnetic force acting ...

  20. Magnetic Carbon Nanotubes for Protein Separation

    OpenAIRE

    Xiaobin Fan; Fengbao Zhang; Guoliang Zhang; Xiuhui Diao; Hongyu Chen

    2012-01-01

    Magnetic separation is a promising strategy in protein separation. Owing to their unique one-dimensional structures and desired magnetic properties, stacked-cup carbon nanotubes (CSCNTs) with magnetic nanoparticles trapped in their tips can serve as train-like systems for protein separation. In this study, we functionalized the magnetic CSCNTs with high density of carboxyl groups by radical addition and then anchored 3-aminophenylboronic acid (APBA) through amidation reaction to achieve orien...

  1. Magnetic separation of antibiotics by electrochemical magnetic seeding

    International Nuclear Information System (INIS)

    Magnetic separation of several classes of antibiotics was investigated using electrochemical magnetic seeding. Electrocoagulation with a sacrificial anode followed by addition of magnetite particles was applied for the magnetic seeding of antibiotics. With electrochemical magnetic seeding using an iron anode, tetracycline antibiotics (oxytetracycline, chlortetracycline, doxycycline and tetracycline) and cephalosporin antibiotic (cefdinir) were rapidly removed from synthetic wastewater by magnetic separation using a neodymium magnet. Iron and aluminium anodes were suitable for magnetic seeding of the antibiotics. The results indicated that the ability of antibiotics to form strong complex with iron and aluminium allowed the higher removal by magnetic separation. This method would be appropriate for rapid treatment of antibiotics in wastewater.

  2. Magnetic separation of antibiotics by electrochemical magnetic seeding

    Energy Technology Data Exchange (ETDEWEB)

    Ihara, I; Toyoda, K [Department of Agricultural Engineering and Socio Economics, Kobe University, Nada, Kobe 657-8501 (Japan); Beneragama, N; Umetsu, K [Department of Animal Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555 (Japan)], E-mail: ihara@port.kobe-u.ac.jp

    2009-03-01

    Magnetic separation of several classes of antibiotics was investigated using electrochemical magnetic seeding. Electrocoagulation with a sacrificial anode followed by addition of magnetite particles was applied for the magnetic seeding of antibiotics. With electrochemical magnetic seeding using an iron anode, tetracycline antibiotics (oxytetracycline, chlortetracycline, doxycycline and tetracycline) and cephalosporin antibiotic (cefdinir) were rapidly removed from synthetic wastewater by magnetic separation using a neodymium magnet. Iron and aluminium anodes were suitable for magnetic seeding of the antibiotics. The results indicated that the ability of antibiotics to form strong complex with iron and aluminium allowed the higher removal by magnetic separation. This method would be appropriate for rapid treatment of antibiotics in wastewater.

  3. Random porous media and magnetic separation of magnetic colloids

    NARCIS (Netherlands)

    Baars, R.J.

    2016-01-01

    The separation of magnetic nanoparticles from a stable dispersion is a challenging task because of the nanoparticles' thermal motion and relatively small magnetic moments. Strong magnetic gradients are required to capture such particles, which can be achieved in a high-gradient magnetic separator. I

  4. Application of High-Gradient Magnetic Separation

    OpenAIRE

    Svoboda, J

    1986-01-01

    Some problems of practical applications of magnetic separation, primarily in mineral industry, are outlined. The work shows that current theoretical models are inadequate in accounting for the magnetic separation of valuable mineral components. The negative impact of a lack of cost-effective separators in the mining industry is discussed.

  5. Isogeometric shape optimization of magnetic density separators

    OpenAIRE

    Dang Manh, N.; Evgrafov, A.; Gravesen, J; Lahaye, D

    2013-01-01

    Purpose: The waste recycling industry increasingly relies on magnetic density separators. These devices generate an upward magnetic force in ferro-fluids allowing to separate the immersed particles according to their mass density. Recently a new separator design that significantly reduces the required amount of permanent magnet material has been proposed. The purpose of this paper is to alleviate the undesired end-effects in this design by altering the shape of the ferromagnetic covers of the...

  6. Magnet design for superconducting open gradient magnetic separator

    Science.gov (United States)

    Ahoranta, Maria; Lehtonen, Jorma; Mikkonen, Risto

    2003-04-01

    The use of superconductivity opens new applications for magnetic separation because very high magnetic fields become available. In this paper the magnet design for a laboratory scale superconducting open gradient magnetic separator is presented. The separator will be used to optimize the separation parameters for different kinds of applications, such as the foundry sand purification. Therefore, the goal of the magnet design is to obtain a constant magnetic force density distribution inside the working volume. The high magnitude of magnetic force density is required because the materials to be separated have low magnetic susceptibilities. The maximum achievable force density is determined by the critical current in superconducting magnets. The advantages and drawbacks of solenoid, racetrack and saddle coil geometries are compared. Ways for improving the performance of the system is discussed. Finally, the influence of the stray field on the slurry flow outside the working volume is studied.

  7. Magnetic Separation of Weakly Magnatic Copper Minerals

    OpenAIRE

    Agricola, J. N.M.; Top, J. L.; Fort, A. F.

    1989-01-01

    High Gradient Magnetic Separation of small (5-38 µm) weakly magnetic copper mineral particles from a copper concentrate and ore has been performed. In previous work coarser fractions of these minerals, bornite and chalcopyrite, were separated successfully. The recovery of the smaller particles in the magnetic fraction decreases but their grade increases compared to the results obtained on the larger particles. At a magnetic background field of 1.3 T the concentrate was upgraded from 72% borni...

  8. Magnetic separations: From steel plants to biotechnology

    Energy Technology Data Exchange (ETDEWEB)

    Cafer T. Yavuz; Arjun Prakash; J.T. Mayo; Vicki L. Colvin [Rice University, Houston, TX (United States). Department of Chemistry

    2009-05-15

    Magnetic separations have for decades been essential processes in diverse industries ranging from steel production to coal desulfurization. In such settings magnetic fields are used in continuous flow processes as filters to remove magnetic impurities. High gradient magnetic separation (HGMS) has found even broader use in wastewater treatment and food processing. Batch scale magnetic separations are also relevant in industry, particularly biotechnology where fixed magnetic separators are used to purify complex mixtures for protein isolation, cell separation, drug delivery, and biocatalysis. In this review, we introduce the basic concepts behind magnetic separations and summarize a few examples of its large scale application. HGMS systems and batch systems for magnetic separations have been developed largely in parallel by different communities. However, in this work we compare and contrast each approach so that investigators can approach both key areas. Finally, we discuss how new advances in magnetic materials, particularly on the nanoscale, as well as magnetic filter design offer new opportunities for industries that have challenging separation problems.

  9. High gradient magnetic separation using superconducting bulk magnets

    International Nuclear Information System (INIS)

    We aim to apply the superconducting bulk magnets to high gradient magnetic separation technique. Two bulk magnets are face-to-face arranged and a pipe stuffed magnetic filters composed of ferromagnetic wires is placed between the magnetic poles. We setup the magnetic separation system and test it using slurry mixed with hematite particles (Fe2O3). Y123 bulk superconductors are magnetized by the 'IMRA' method (pulsed-field magnetization), and consequently a magnetic field of 1.59 T is generated at the center of 20 mm gap between the magnetic poles. As a result of experiment on the magnetic separation, hematite particles of over 90% were removed from slurry at the flow rate of 2 l/min

  10. Microfabricated Passive Magnetic Bead separators

    DEFF Research Database (Denmark)

    Hansen, Mikkel Fougt; Lund-Olesen, Torsten; Smistrup, Kristian;

    2006-01-01

    The use and manipulation of functionalized magnetic beads for bioanalysis in lab-on-a-chip systems is receiving growing interest. We have developed microfluidic systems with integrated magnetic structures for the capture and release of magnetic beads. The systems are fabricated in silicon by deep...

  11. The Selection and Application of Magnetic Separation Euipment. Part I

    OpenAIRE

    Morgan, D G; Bronkala, W. J.

    1991-01-01

    A survey of magnetic separators and of their selection in applications for tramp iron removal is given. Magnetic pulleys, suspended magnets, drum magnetic separators, plate and grate magnets are described and selection procedures are outlined.

  12. Particle acceleration at a reconnecting magnetic separator

    CERN Document Server

    Threlfall, J; Parnell, C E; Oskoui, S Eradat

    2014-01-01

    While the exact acceleration mechanism of energetic particles during solar flares is (as yet) unknown, magnetic reconnection plays a key role both in the release of stored magnetic energy of the solar corona and the magnetic restructuring during a flare. Recent work has shown that special field lines, called separators, are common sites of reconnection in 3D numerical experiments. To date, 3D separator reconnection sites have received little attention as particle accelerators. We investigate the effectiveness of separator reconnection as a particle acceleration mechanism for electrons and protons. We study the particle acceleration using a relativistic guiding-centre particle code in a time-dependent kinematic model of magnetic reconnection at a separator. The effect upon particle behaviour of initial position, pitch angle and initial kinetic energy are examined in detail, both for specific (single) particle examples and for large distributions of initial conditions. The separator reconnection model contains ...

  13. Magnetic separation of uranium from magnesium fluoride

    International Nuclear Information System (INIS)

    The attraction or repulsion of particles by a magnetic gradient, based on the respective susceptibilities, provides the basis for physical separation of particles that are comprised predominantly of uranium from those that are predominantly magnesium fluoride (MgF2). To determine the effectiveness of this approach, a bench-scale magnetic separator from the S.G. Frantz Co., Inc. was used. In the Frantz Model L-1, particles are fed through a funnel onto a vibration tray and through a magnetic field. The specific design of the Frantz magnet causes the magnetic field strength to vary along the width of the magnet, setting up a gradient. The tray in the magnetic field is split at a point about half way down its length so that the separated material does not recombine. A schematic is presented of Frantz Model L-1 CN - the same magnet configured for high gradient magnetic separation of liquid-suspended particles. Here different pole pieces create a uniform magnetic field, and stainless steel wood in the canister between the pole pieces creates the high gradient. 1 ref., 6 figs., 2 tabs

  14. Rapid Characterization of Magnetic Moment of Cells for Magnetic Separation

    OpenAIRE

    Ooi, Chinchun; Earhart, Christopher M.; Wilson, Robert J.; Wang, Shan X.

    2013-01-01

    NCI-H1650 lung cancer cell lines labeled with magnetic nanoparticles via the Epithelial Cell Adhesion Molecule (EpCAM) antigen were previously shown to be captured at high efficiencies by a microfabricated magnetic sifter. If fine control and optimization of the magnetic separation process is to be achieved, it is vital to be able to characterize the labeled cells’ magnetic moment rapidly. We have thus adapted a rapid prototyping method to obtain the saturation magnetic moment of these cells....

  15. Microfluidic magnetic separator using an array of soft magnetic elements

    DEFF Research Database (Denmark)

    Smistrup, Kristian; Lund-Olesen, Torsten; Hansen, Mikkel Fougt;

    2006-01-01

    We present the design, fabrication, characterization, and demonstration of a new passive magnetic bead separator. The device operates in an effective state when magnetized by an external magnetic field of only 50 mT, which is available from a tabletop electromagnet. We demonstrate the complete...

  16. Microfluidic magnetic separator using an array of soft magnetic elements

    OpenAIRE

    Smistrup, Kristian; Lund-Olesen, Torsten; Hansen, Mikkel Fougt; Tang, Peter Torben

    2006-01-01

    We present the design, fabrication, characterization, and demonstration of a new passive magnetic bead separator. The device operates in an effective state when magnetized by an external magnetic field of only 50 mT, which is available from a tabletop electromagnet. We demonstrate the complete capture of 1.0 mu m fluorescent magnetic beads from a 7.5 mu L sample volume traveling at an average linear fluid velocity of 5 mm/s.

  17. High gradient magnetic separation for powder material processing

    OpenAIRE

    Idziaszek-Gonzalez, Alicja; Kozlowski, Waldemar

    2013-01-01

    High gradient magnetic separators are widely used in both research and industry. The aim of the work is the analysis of magnetic separation for powder material processing. The paper presents the simulations of magnetic field for magnetic separators with various filter shapes. Finite Element Analysis has been used to get the magnetic field over the studied separator grid.

  18. Magnetic separation of uranium from waste materials

    International Nuclear Information System (INIS)

    Criteria were developed for selection of candidate wastes for testing magnetic separation of uranium and/or other paramagnetic materials. A survey of Department of Energy (DOE) hazardous wastes was conducted to determine good candidates for bench-scale magnetic separation tests. Representatives of 21 DOE sites were contacted, and materials were identified as potential candidates for magnetic separation. To date, seven samples have been obtained and tested for separability of uranium with a bench-scale magnetic assaying device. The samples tested have been obtained from the K-1401B and K-1401C ponds in Oak Ridge, Tennessee; from waste piles in Maywood, New Jersey; from North and South Ponds in Richland, Washington; and from magnesium fluoride drums in Fernald, Ohio. The magnetic device utilized in these tests can be used in a deflective mode with dry particulate samples or a matrix-gradient mode with either dry particulate or liquid-suspended materials. Uranium separation from magnesium fluoride has shown exceptionally good performance in both wet and dry systems and could be an important application of the technology. 13 figs., 6 tabs

  19. The Concept of Magnetic Mineral Separation by Particle Rotation

    OpenAIRE

    Allen, N. R.

    2002-01-01

    At present all magnetic separators use particle attraction as the separating criterion. Differences in magnetic susceptibility then determine whether or not two mineral particles can be magnetically separated. Some separators, such as the Magstream separator, have gone a step further and combined magnetic attraction with particle specific gravity.Mineral particles have a second, largely ignored, magnetic property that can be used as a separating criterion, and this property is particle rotati...

  20. Plasma separation from magnetic field lines in a magnetic nozzle

    Science.gov (United States)

    Kaufman, D. A.; Goodwin, D. G.; Sercel, J. C.

    1993-01-01

    This paper discusses conditions for separation of a plasma from the magnetic field of a magnetic nozzle. The analysis assumes a collisionless, quasineutral plasma, and therefore the results represent a lower bound on the amount of detachment possible for a given set of plasma conditions. We show that collisionless separation can occur because finite electron mass inhibits the flow of azimuthal currents in the nozzle. Separation conditions are governed by a parameter G which depends on plasma and nozzle conditions. Several methods of improving plasma detachment are presented, including moving the plasma generation zone downstream from the region of strongest magnetic field and using dual magnets to focus the plasma beam. Plasma detachment can be enhanced by manipulation of the nozzle configuration.

  1. Multistage Magnetic Separator of Cells and Proteins

    Science.gov (United States)

    Barton, Ken; Ainsworth, Mark; Daily, Bruce; Dunn, Scott; Metz, Bill; Vellinger, John; Taylor, Brock; Meador, Bruce

    2005-01-01

    The multistage electromagnetic separator for purifying cells and magnetic particles (MAGSEP) is a laboratory apparatus for separating and/or purifying particles (especially biological cells) on the basis of their magnetic susceptibility and magnetophoretic mobility. Whereas a typical prior apparatus based on similar principles offers only a single stage of separation, the MAGSEP, as its full name indicates, offers multiple stages of separation; this makes it possible to refine a sample population of particles to a higher level of purity or to categorize multiple portions of the sample on the basis of magnetic susceptibility and/or magnetophoretic mobility. The MAGSEP includes a processing unit and an electronic unit coupled to a personal computer. The processing unit includes upper and lower plates, a plate-rotation system, an electromagnet, an electromagnet-translation system, and a capture-magnet assembly. The plates are bolted together through a roller bearing that allows the plates to rotate with respect to each other. An interface between the plates acts as a seal for separating fluids. A lower cuvette can be aligned with as many as 15 upper cuvette stations for fraction collection during processing. A two-phase stepping motor drives the rotation system, causing the upper plate to rotate for the collection of each fraction of the sample material. The electromagnet generates a magnetic field across the lower cuvette, while the translation system translates the electromagnet upward along the lower cuvette. The current supplied to the electromagnet, and thus the magnetic flux density at the pole face of the electromagnet, can be set at a programmed value between 0 and 1,400 gauss (0.14 T). The rate of translation can be programmed between 5 and 2,000 m/s so as to align all sample particles in the same position in the cuvette. The capture magnet can be a permanent magnet. It is mounted on an arm connected to a stepping motor. The stepping motor rotates the arm to

  2. The separation velocity of emerging magnetic flux

    Science.gov (United States)

    Chou, Dean-Yi; Wang, Haimin

    1987-01-01

    The separation velocities and magnetic fluxes of 24 emerging bipoles on the sun are measured in order to provide data on the emerging mechanism. Velocities are shown to range from about 0.2-1 km/s, bipole fluxes to range over more than two orders of magnitude, and the mean field strength and the sizes to range over one order of magnitude. No correlation is noted between measured separation velocities and either the flux or the mean field strength of the bipole. Predicted separation velocities are found be about one order of magnitude greater than measured values.

  3. Method of magnetically separating particulate materials

    NARCIS (Netherlands)

    Rem, P.C.; Zhang, S.

    2000-01-01

    The present invention relates to a method of separating non-ferro metal particles using a rotating magnetic field. According to the invention the particles are surrounded by a fluid restricting the fall-velocity significantly, suitably a fluid having a density of at least 0.1 kg/l. The presence of s

  4. The Selection and Application of Magnetic Separation Equipment. Part II.

    OpenAIRE

    Morgan, D G; Bronkala, W. J.

    1993-01-01

    A survey of magnetic separators and of their selection in application for concentration and purification is given. Wet and dry low–intensity drum separators, magnetic pulleys, induced magnetic roll separator and cross–belt separator are described and selection procedures are outlined.

  5. 48 CFR 870.111-5 - Frozen processed food products.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Frozen processed food... DEPARTMENT SUPPLEMENTARY REGULATIONS SPECIAL PROCUREMENT CONTROLS Controls 870.111-5 Frozen processed food products. (a) The following frozen processed food products must have a label complying with the...

  6. A Study of Magnetic Aggregation—Gravity Separation for Separation of Coarse Magnetite Ores

    OpenAIRE

    Yu–Shu, Zhang; De–Zhang, Luo; Shuyi, Liu

    1997-01-01

    This paper describes experiments on separation of coarse magnetite ores using magnetic aggregation—gravity separation (MAGS) process for the first time. The results show that the MAGS technology can have a coarser separation size as well as a higher grade of the the magnetic product than the traditional low—intensity magnetic separation technology.

  7. A new industrial application of magnetic separation

    International Nuclear Information System (INIS)

    The aim of this work was to investigate the application of magnetic separation to the removal and recovery of carbon steel grinding swarf from machining fluids used in large-scale industrial manufacturing processes such as in the automotive industry. Magnetic separation is a technology which has found widespread application in the mineral processing industry and in particular the beneficiation of kaolin clay for use in the paper industry. The technical feasibility of the application was demonstrated in the early stages of the work by the successful treatment of industrial samples using a crude laboratory-scale separator. In addition, the fluid and swarf material underwent extensive analysis using electron microscope-based optical and spectroscopic techniques in order to ascertain the presence of other undesirable components of the fluid that would require removal also. It was demonstrated by these results that the overall objective of the project was the development and testing of a laboratory-scale system which would allow the optimum operational parameters to be ascertained for the design of a commercially viable, large-scale system. A series of detailed trials on large volumes of industrial samples was carried out in conjunction with the development of the modifications that were required to existing magnetic separation theory in order to accommodate the particulars of this application. The trial system was tested to low applied magnetic strengths and high fluid flow velocities in order to optimise the economics of the application, resulting in extraction efficiencies of the order of 99.998% being achieved. During the course of the project, a new type of matrix cleaning system was developed for which a patent was applied and this was successfully tested in the trial system. Economic appraisal of the application suggests that an industrial-scale system could provide reliable, high quality recovery of grinding swarf at a cost of around one cent per cubic metre of

  8. Magnetic force on a magnetic particle within a high gradient magnetic separator

    Science.gov (United States)

    Baik, S. K.; Ha, D. W.; Kwon, J. M.; Lee, Y. J.; Ko, R. K.

    2013-01-01

    HGMS (High Gradient Magnetic Separator) uses matrix to make high magnetic field gradient so that ferro- or para-magnetic particles can be attracted to them by high magnetic force. The magnetic force generated by the field gradient is several thousand times larger than that by background magnetic field alone. So the HGMS shows excellent performance compared with other magnetic separators. These matrixes are usually composed of stainless steel wires having high magnetization characteristics. This paper deals with superconducting HGMS which is aimed for purifying waste water by using stainless steel matrix. Background magnetic field up to 6 T is generated by a superconducting solenoid and the stainless steel matrixes are arranged inside of the solenoid. Based on magnetic field calculated by FEM (Finite Element Method), we could calculate magnetic force acting on a magnetic particle such as hematite and maghemite consisting of major impurities in the condenser water of a thermal power station.

  9. A Study of Matrices for High–Intensity Magnetic Separators

    OpenAIRE

    Maly, V. M.

    1995-01-01

    This paper summarises the results of the research carried out, for the last 15 years, by the Department of Separation of Weakly Magnetic Ores of the Mekhanobrchermet Institute, Krivoy Rog, Ukraine, on the matrices of high–intensity magnetic separators foe beneficiation of weakly magnetic iron ores and other weakly magnetic materials.

  10. High Radiation Environment Nuclear Fragment Separator Magnet

    Energy Technology Data Exchange (ETDEWEB)

    Kahn, Stephen [Muons, Inc., Batavia, IL (United States); Gupta, Ramesh [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2016-01-31

    Superconducting coils wound with HTS conductor can be used in magnets located in a high radiation environment. NbTi and Nb3Sn superconductors must operate at 4.5 K or below where removal of heat is less efficient. The HTS conductor can carry significant current at higher temperatures where the Carnot efficiency is significantly more favorable and where the coolant heat capacity is much larger. Using the HTS conductor the magnet can be operated at 40 K. This project examines the use of HTS conductor for the Michigan State University Facility For Rare Isotope Beams (FRIB) fragment separator dipole magnet which bends the beam by 30° and is located in a high radiation region that will not be easily accessible. Two of these magnets are needed to select the chosen isotope. There are a number of technical challenges to be addressed in the design of this magnet. The separator dipole is 2 m long and subtends a large angle. The magnet should keep a constant transverse field profile along its beam reference path. Winding coils with a curved inner segment is difficult as the conductor will tend to unwind during the process. In the Phase I project two approaches to winding the conductor were examined. The first was to wind the coils with curved sections on the inner and outer segments with the inner segment wound with negative curvature. The alternate approach was to use a straight segment on the inner segment to avoid negative curvature. In Phase I coils with a limited number of turns were successfully wound and tested at 77 K for both coil configurations. The Phase II program concentrated on the design, coil winding procedures, structural analysis, prototyping and testing of an HTS curved dipole coil at 40 K with a heat load representative of the radiation environment. One of the key criteria of the design of this magnet is to avoid the use of organic materials that would degrade rapidly in radiation. The Lorentz forces expected from the coils interacting with the

  11. Magnetic force on a magnetic particle within a high gradient magnetic separator

    Energy Technology Data Exchange (ETDEWEB)

    Baik, S.K., E-mail: skbaik@keri.re.kr [Korea Electrotechnology Research Institute, Seongju-dong 28-1, Changwon (Korea, Republic of); Ha, D.W.; Kwon, J.M.; Lee, Y.J.; Ko, R.K. [Korea Electrotechnology Research Institute, Seongju-dong 28-1, Changwon (Korea, Republic of)

    2013-01-15

    Highlights: ► Magnetic field and the gradient decide magnetic force on a particle in HGMS (High Gradient Magnetic Separation). ► We calculated the field and the gradient of a superconducting HGMS system by finite element method. ► We could calculate magnetic force on a particle consisting of major impurities in the condenser water of a thermal power station. -- Abstract: HGMS (High Gradient Magnetic Separator) uses matrix to make high magnetic field gradient so that ferro- or para-magnetic particles can be attracted to them by high magnetic force. The magnetic force generated by the field gradient is several thousand times larger than that by background magnetic field alone. So the HGMS shows excellent performance compared with other magnetic separators. These matrixes are usually composed of stainless steel wires having high magnetization characteristics. This paper deals with superconducting HGMS which is aimed for purifying waste water by using stainless steel matrix. Background magnetic field up to 6 T is generated by a superconducting solenoid and the stainless steel matrixes are arranged inside of the solenoid. Based on magnetic field calculated by FEM (Finite Element Method), we could calculate magnetic force acting on a magnetic particle such as hematite and maghemite consisting of major impurities in the condenser water of a thermal power station.

  12. Magnetic force on a magnetic particle within a high gradient magnetic separator

    International Nuclear Information System (INIS)

    Highlights: ► Magnetic field and the gradient decide magnetic force on a particle in HGMS (High Gradient Magnetic Separation). ► We calculated the field and the gradient of a superconducting HGMS system by finite element method. ► We could calculate magnetic force on a particle consisting of major impurities in the condenser water of a thermal power station. -- Abstract: HGMS (High Gradient Magnetic Separator) uses matrix to make high magnetic field gradient so that ferro- or para-magnetic particles can be attracted to them by high magnetic force. The magnetic force generated by the field gradient is several thousand times larger than that by background magnetic field alone. So the HGMS shows excellent performance compared with other magnetic separators. These matrixes are usually composed of stainless steel wires having high magnetization characteristics. This paper deals with superconducting HGMS which is aimed for purifying waste water by using stainless steel matrix. Background magnetic field up to 6 T is generated by a superconducting solenoid and the stainless steel matrixes are arranged inside of the solenoid. Based on magnetic field calculated by FEM (Finite Element Method), we could calculate magnetic force acting on a magnetic particle such as hematite and maghemite consisting of major impurities in the condenser water of a thermal power station

  13. Potential of a Dry Rotating-Disk Magnetic Separator

    OpenAIRE

    Gerhold, J.

    1992-01-01

    Selectivity is a severe problem in dry magnetic separation. Dry rotating-disk magnetic separator utilizes radial magnetic forces that compete against centrifugal mass forces. Genuine equilibrium of forces, which is compulsory for high selectivity can thus be achieved at a high level of magnetic force. The potential of an iron-pole separator for intergrown ferromagnetics, as well as of a superconducting system for paramagnetic materials is discussed.

  14. The Separation Performance of the Pulsating High–Gradient Magnetic Separator

    OpenAIRE

    Peng, Yang; Shuyi, Liu; Jin, Chen

    1993-01-01

    In order to develop the pulsating high–gradient magnetic separation technology, a laboratory pulsating high–gradient magnetic separator (PHGMS) has been manufactured.. Experiments on its separation performance were carried out. The results show that PHGMS can significantly increase the grade of the magnetic product and it can eliminate the matrix clogging. The characteristic curve of the pulsating fluid was measured and a formula for estimating the grade of the magnetic product from PHGMS was...

  15. Highly efficient magnetic separation using five-aligned superconducting bulk magnet

    International Nuclear Information System (INIS)

    We have constructed the highly efficient magnetic separation system using five-aligned superconducting bulk magnets, which has ten usable magnetic poles on both sides in open space. We applied the bulk magnet system to the magnetic separation of ferromagnetic particles (magnetite; Fe3O4) and paramagnetic ones (α-hematite; Fe2O3) dispersed in water for various average particle diameters d, flow speeds VF and initial concentrations C0 of the particles. The multi-bulk magnet system has been confirmed to be effective for the magnetic separation and the efficiency of the magnetic separation per one magnetic pole has been estimated using the theoretical relation.

  16. Highly efficient magnetic separation using five-aligned superconducting bulk magnet

    Science.gov (United States)

    Fujishiro, Hiroyuki; Miura, Takashi; Naito, Tomoyuki; Hayashi, Hidemi

    2010-06-01

    We have constructed the highly efficient magnetic separation system using five-aligned superconducting bulk magnets, which has ten usable magnetic poles on both sides in open space. We applied the bulk magnet system to the magnetic separation of ferromagnetic particles (magnetite; Fe3O4) and paramagnetic ones (α-hematite Fe2O3) dispersed in water for various average particle diameters d, flow speeds VF and initial concentrations C0 of the particles. The multi-bulk magnet system has been confirmed to be effective for the magnetic separation and the efficiency of the magnetic separation per one magnetic pole has been estimated using the theoretical relation.

  17. Integrated acoustic and magnetic separation in microfluidic channels

    OpenAIRE

    Adams, Jonathan; Thevoz, Patrick; Bruus, Henrik; Soh, H. Tom

    2009-01-01

    With a growing number of cell-based biotechnological applications, there is a need for particle separation systems capable of multiparameter separations at high purity and throughput, beyond what is presently offered by traditional methods including fluorescence activated cell sorting and column-based magnetic separation. Toward this aim, we report on the integration of microfluidic acoustic and magnetic separation in a monolithic device for multiparameter particle separation. Using our devic...

  18. The Application of Superconducting Magnet Systems to Dry Magnetic Separation of Coal

    OpenAIRE

    Pitel, J.; Chovanec, F.; Hencl, V.

    1992-01-01

    Two laboratory-scale facilities for dry magnetic separation using superconducting magnet systems are described. The results of magnetic separation of pulverized coal samples from various open-cast mines in Czechoslovakia, using these facilities, are presented. The efficiency of both open-gradient and high-gradient magnetic separation techniques, together with pretreatment of coal samples, are discussed.

  19. An isotope separation magnet for the injector test experiment (MITE)

    International Nuclear Information System (INIS)

    A magnet has been designed for space-charge neutralization studies on the Injector Test Experiment at the Chalk River Nuclear Laboratories. Augmented by suitable collectors, the magnet could also be used for pilot-scale isotope separations. The present report documents the design of this particular magnet and illustrates the process of designing beam transport magnets in general

  20. Microfabricated magnetic sifter for high-throughput and high-gradient magnetic separation

    OpenAIRE

    Earhart, Christopher M.; Wilson, Robert J.; White, Robert L.; Pourmand, Nader; Wang, Shan X.

    2009-01-01

    A microfabricated magnetic sifter has been designed and fabricated for applications in biological sample preparation. The device enables high-throughput, high-gradient magnetic separation of magnetic nanoparticles by utilizing columnar fluid flow through a dense array (~5000/mm2) of micropatterned slots in a magnetically soft membrane. The potential of the sifter for separation of magnetic nanoparticles conjugated with capture antibodies is demonstrated through quantitative separation experim...

  1. Use of an apparatus for separating magnetic pieces of material

    NARCIS (Netherlands)

    Rem, P.C.; Berkhout, S.P.M.

    2010-01-01

    Using of an apparatus for separating magnetic pieces of scrap-material of a first group from magnetic pieces of scrap- material of a second group, wherein a mixture of pieces of scrap-material from the first group and from the second group is collectively transported with a conveyor to a separating

  2. In Situ Magnetic Separation for Extracellular Protein Production

    DEFF Research Database (Denmark)

    Kappler, T.; Cerff, Martin; Ottow, Kim Ekelund;

    2009-01-01

    A new approach for in situ product removal from bioreactors is presented in which high-gradient magnetic separation is used. This separation process was used for the adsorptive removal of proteases secreted by Bacillus licheniformis. Small, non-porous bacitracin linked magnetic adsorbents were em...

  3. High gradient magnetic separation applied to environmental remediation

    International Nuclear Information System (INIS)

    High Gradient Magnetic Separation (HGMS) is an application of superconducting magnet technology to the separation of magnetic solids from other solids, liquids, or gases. The production of both high magnetic fields (>4 T) and large field gradients using superconducting magnet technology has made it possible to separate a previously unreachable but large family of paramagnetic materials. This is a powerful technique that can be used to separate widely dispersed contaminants from a host material and may be the only technique available for separating material in the colloidal state. Because it is a physical separation process, no additional waste is generated. We are applying this technology to the treatment of radioactive wastes for environmental remediation. We have conducted tests examining slurries containing nonradioactive, magnetic surrogates. Results from these studies were used to verify our analytical model of the separation process. The model describes the rate process for magnetic separation and is based on a force balance on the paramagnetic species. This model was used to support bench scale experiments and prototype separator design

  4. Rare Cell Separation and Analysis by Magnetic Sorting

    OpenAIRE

    Zborowski, Maciej; Chalmers, Jeffrey J.

    2011-01-01

    The separation and or isolation of rare cells using magnetic forces is commonly used and growing in use ranging from simple sample prep for further studies to a FDA approved, clinical diagnostic test. This grown is the result of both the demand to obtain homogeneous rare cells for molecular analysis and the dramatic increases in the power of permanent magnets that even allow the separation of some unlabeled cells based on intrinsic magnetic moments, such as malaria parasite-infected red blood...

  5. Magnetic separator having a multilayer matrix, method and apparatus

    Science.gov (United States)

    Kelland, David R.

    1980-01-01

    A magnetic separator having multiple staggered layers of porous magnetic material positioned to intercept a fluid stream carrying magnetic particles and so placed that a bypass of each layer is effected as the pores of the layer become filled with material extracted from the fluid stream.

  6. Remediation of Hanford tank waste using magnetic separation

    International Nuclear Information System (INIS)

    Large volumes of high-level radioactive waste are stored at the Department of Energy's Hanford site. Magnetic separation, a physical separation, process, can be used to segregate actinides and certain fission products from the waste. High gradient magnetic separation (HGMS) tests have been performed successfully using a simulated, nonradioactive underground storage tank (UST) waste. Variations in HGMS test parameters included separator matrix material, magnetic field strength, slurry surfactant, and slurry solids loading. Cerium was added to the simulated tank waste to act as a uranium surrogate. Results show that over 77% of the uranium surrogate can be captured and concentrated from the original bulk with a simple procedure. The results of these tests and the feasibility of magnetic separation for pretreatment of UST waste are discussed

  7. RING-SHAPED MAGNETIC POTENTIAL BARRIERS FOR SEPARATION OF WEAKLY MAGNETIC PARTICLES

    OpenAIRE

    Gerhold, J.; Schmidt, Julien

    1984-01-01

    Weakly magnetic materials may be separated within Open Gradient Magnetic Separators using dry or wet processes. Axial-symmetric arrangments are of special interest when utilizing centrifugal forces in addition to magnetic forces. Thereby gradient fields are needed which generate mainly radially inwards directed forces. Such forces form a kind of magnetic potential barrier which cannot be transversed by magnetic particles. The necessary field distributions can be attained by means of properly ...

  8. Microstripes for transport and separation of magnetic particles

    DEFF Research Database (Denmark)

    Donolato, Marco; Dalslet, Bjarke Thomas; Hansen, Mikkel Fougt

    2012-01-01

    We present a simple technique for creating an on-chip magnetic particle conveyor based on exchange-biased permalloy microstripes. The particle transportation relies on an array of stripes with a spacing smaller than their width in conjunction with a periodic sequence of four different externally...... applied magnetic fields. We demonstrate the controlled transportation of a large population of particles over several millimeters of distance as well as the spatial separation of two populations of magnetic particles with different magnetophoretic mobilities. The technique can be used for the controlled...... selective manipulation and separation of magnetically labelled species. (C) 2012 American Institute of Physics....

  9. A High-Throughput SU-8Microfluidic Magnetic Bead Separator

    OpenAIRE

    Bu, Minqiang; Christensen, T. B.; Smistrup, Kristian; Wolff, Anders; Hansen, Mikkel Fougt

    2007-01-01

    We present a novel microfluidic magnetic bead separator based on SU-8 fabrication technique for high through-put applications. The experimental results show that magnetic beads can be captured at an efficiency of 91 % and 54 % at flow rates of 1 mL/min and 4 mL/min, respectively. Integration of soft magnetic elements in the chip leads to a slightly higher capturing efficiency and a more uniform distribution of captured beads over the separation chamber than the system without soft magnetic el...

  10. High gradient magnetic field microstructures for magnetophoretic cell separation.

    Science.gov (United States)

    Abdel Fattah, Abdel Rahman; Ghosh, Suvojit; Puri, Ishwar K

    2016-08-01

    Microfluidics has advanced magnetic blood fractionation by making integrated miniature devices possible. A ferromagnetic microstructure array that is integrated with a microfluidic channel rearranges an applied magnetic field to create a high gradient magnetic field (HGMF). By leveraging the differential magnetic susceptibilities of cell types contained in a host medium, such as paramagnetic red blood cells (RBCs) and diamagnetic white blood cells (WBCs), the resulting HGMF can be used to continuously separate them without attaching additional labels, such as magnetic beads, to them. We describe the effect of these ferromagnetic microstructure geometries have on the blood separation efficacy by numerically simulating the influence of microstructure height and pitch on the HGMF characteristics and resulting RBC separation. Visualizations of RBC trajectories provide insight into how arrays can be optimized to best separate these cells from a host fluid. Periodic microstructures are shown to moderate the applied field due to magnetic interference between the adjacent teeth of an array. Since continuous microstructures do not similarly weaken the resultant HGMF, they facilitate significantly higher RBC separation. Nevertheless, periodic arrays are more appropriate for relatively deep microchannels since, unlike continuous microstructures, their separation effectiveness is independent of depth. The results are relevant to the design of microfluidic devices that leverage HGMFs to fractionate blood by separating RBCs and WBCs. PMID:27294532

  11. Electron spin separation without magnetic field

    International Nuclear Information System (INIS)

    A nanodevice capable of separating spins of two electrons confined in a quantum dot formed in a gated semiconductor nanowire is proposed. Two electrons confined initially in a single quantum dot in the singlet state are transformed into the system of two electrons confined in two spatially separated quantum dots with opposite spins. In order to separate the electrons' spins we exploit transitions between the singlet and the triplet state, which are induced by resonantly oscillating Rashba spin–orbit coupling strength. The proposed device is all electrically controlled and the electron spin separation can be realized within tens of picoseconds. The results are supported by solving numerically the quasi-one-dimensional time-dependent Schroedinger equation for two electrons, where the electron–electron correlations are taken into account in the exact manner. (paper)

  12. Microwave Pretreatment of Coal Prior to Magnetic Separation

    OpenAIRE

    Butcher, D. A.; Rowson, N. A.

    1995-01-01

    New methods to reduce the total sulphur content of coals are being developed since the introduction of legislation requiring cuts in sulphur emissions to the atmosphere. It is known that weakly paramagnetic pyrite (FeS2) particles are difficult to remove from clean coal by standard magnetic separation techniques. Data is presented here comparing standard magnetic separation tests to results achieved when the coal is subjected to a caustic microwave leach pretreatment, prior to conventional dr...

  13. MAGNETITE RECOVERY IN COAL WASHING BY HIGH GRADIENT MAGNETIC SEPARATION

    Science.gov (United States)

    The report describes a demonstration of the successful recovery of magnetite from mixtures of magnetite and coal, like those found in a coal-washing circuit, by High Gradient Magnetic Separation. The demonstration was part of a research program at Francis Bitter National Magnet L...

  14. A High-Throughput SU-8Microfluidic Magnetic Bead Separator

    DEFF Research Database (Denmark)

    Bu, Minqiang; Christensen, T. B.; Smistrup, Kristian;

    2007-01-01

    We present a novel microfluidic magnetic bead separator based on SU-8 fabrication technique for high through-put applications. The experimental results show that magnetic beads can be captured at an efficiency of 91 % and 54 % at flow rates of 1 mL/min and 4 mL/min, respectively. Integration...

  15. Separation and acceleration of magnetic monopole analogs in semiconductor microcavities

    OpenAIRE

    Flayac, H.; Solnyshkov, D.; Malpuech, G.

    2012-01-01

    Half-integer topological defects in polariton condensates can be regarded as magnetic charges, with respect to built-in effective magnetic fields present in microcavities. We show how an integer topological defect can be separated into a pair of half-integer ones, paving the way towards flows of magnetic charges: spin currents or magnetricity. We discuss the corresponding experimental implementation within microwires (with half-solitons) and planar microcavities (with half-vortices).

  16. Wet High Intensity Magnetic Separation of Iron Minerals

    OpenAIRE

    Shao, Y.; Veasey, T. J.; Rowson, N. A.

    1996-01-01

    Four different iron minerals were selected for study, and five size fractions of each mineral were prepared. The magnetic properties of these minerals were measured. The effect of particle size and magnetic susceptibility on wet high intensity magnetic separation was studied simultaneously. It was found that hematite—1 was a strongly paramagnetic mineral, and the effect of particle size in WHIMS was not significant. Goethite and limonite were weakly paramagnetic minerals, and could not be eff...

  17. Use of high gradient magnetic separation for actinide application

    International Nuclear Information System (INIS)

    Decontamination of materials such as soils or waste water that contain radioactive isotopes, heavy metals, or hazardous components is a subject of great interest. Magnetic separation is a physical separation process that segregates materials on the basis of magnetic susceptibility. Because the process relies on physical properties, separations can be achieved while producing a minimum of secondary waste. Most traditional physical separation processes effectively treat particles larger than 70 microns. In many situations, the radioactive contaminants are found concentrated in the fine particle size fraction of less than 20 microns. For effective decontamination of the fine particle size fraction most current operations resort to chemical dissolution methods for treatment. High gradient magnetic separation (HGMS) is able to effectively treat particles from 90 to ∼0.1 micron in diameter. The technology is currently used on the 60 ton per hour scale in the kaolin clay industry. When the field gradient is of sufficiently high intensity, paramagnetic particles can be physically captured and separated from extraneous nonmagnetic material. Because all actinide compounds are paramagnetic, magnetic separation of actinide containing mixtures is feasible. The advent of reliable superconducting magnets also makes magnetic separation of weakly paramagnetic species attractive. HGMS work at Los Alamos National Laboratory (LANL) is being developed for soil remediation, waste water treatment and treatment of actinide chemical processing residues. LANL and Lockheed Environmental Systems and Technologies Company (LESAT) have worked on a co-operative research and development agreement (CRADA) to develop HGMS for radioactive soil decontamination. The program is designed to transfer HGMS from the laboratory and other industries for the commercial treatment of radioactive contaminated materials. 9 refs., 2 figs., 2 tabs

  18. Magnetic source separation in Earth's outer core.

    Science.gov (United States)

    Hoffman, Kenneth A; Singer, Brad S

    2008-09-26

    We present evidence that the source of Earth's axial dipole field is largely independent from the sources responsible for the rest of the geomagnetic field, the so-called nonaxial dipole (NAD) field. Support for this claim comes from correlations between the structure of the historic field and the behavior of the paleomagnetic field recorded in precisely dated lavas at those times when the axial dipole was especially weak or nearly absent. It is argued that a "stratification" of magnetic sources exists in the fluid core such that the axial dipole is the only observed field component that is nearly immune from the influence exerted by the lowermost mantle. It follows that subsequent work on spherical harmonic-based field descriptions may now incorporate an understanding of a dichotomy of spatial-temporal dynamo processes. PMID:18818352

  19. Bench-scale magnetic separation of Department of Energy wastes

    International Nuclear Information System (INIS)

    Criteria were developed for selection of candidate wastes for testing magnetic separation of uranium and/or other paramagnetic materials. A survey of Department of Energy (DOE) hazardous wastes was conducted to determine good candidates for bench-scale magnetic separation tests. Representatives of 21 DOE sites were contacted, and 11 materials were identified as potential candidates for magnetic separation. To date, seven samples have been obtained and tested for separability of uranium with a bench-scale magnetic assaying device. The samples tested have been obtained from the K-1401B and K-1401C ponds in Oak Ridge, Tennessee; from waste piles in Maywood, New Jersey; from North and South Ponds in Richland, Washington; and from magnesium fluoride drums in Fernald, Ohio. The magnetic device utilized in these tests can be used in an open-gradient mode with dry particulate or liquid-suspended materials. Uranium separation from magnesium fluoride has shown exceptionally good performance in both open- and high-gradient modes and could be an important application of the technology

  20. Waste remediation using in situ magnetically assisted chemical separation

    International Nuclear Information System (INIS)

    The magnetically assisted chemical separation process (MACS) combines the selective and efficient separation afforded by chemical sorption with the magnetic recovery of ferromagnetic particles. This process is being developed for treating the underground storage tanks at Hanford. These waste streams contain cesium, strontium, and transuranics (TRU) that must be removed before this waste can be disposed of as grout. The separation process uses magnetic particles coated with either (1) a selective ion exchange material or an organic extractant containing solvent (for cesium and strontium removal) or (2) solvents for selective separation of TRU elements (e.g., TRUEX process). These coatings, by their chemical nature, selectively separate the contaminants onto the particles, which can then be recovered from the tank using a magnet. Once the particles are removed, the contaminants can either be left on the loaded particles and added to the glass feed slurry or stripped into a small volume of solution so that the extracting particles can be reused. The status of chemistry and separation process is discussed in this paper

  1. Iso-geometric shape optimization of magnetic density separators

    DEFF Research Database (Denmark)

    Dang Manh, Nguyen; Evgrafov, Anton; Gravesen, Jens;

    2014-01-01

    Purpose The waste recycling industry increasingly relies on magnetic density separators. These devices generate an upward magnetic force in ferro-fluids allowing to separate the immersed particles according to their mass density. Recently, a new separator design has been proposed that significantly...... covers with B-splines and defines a cost functional that measures the non-uniformity of the magnetic field in an area above the poles. The authors apply an iso-geometric shape optimization procedure, which allows us to accurately represent, analyze and optimize the geometry using only a few design...... variables. The design problem is regularized by imposing constraints that enforce the convexity of the pole cover shapes and is solved by a non-linear optimization procedure. The paper validates the implementation of the algorithm using a simplified variant of the design problem with a known analytical...

  2. An experimental investigation of the effect of preliminary magnetization in magnetic separation

    International Nuclear Information System (INIS)

    The effects of preliminary magnetization on the high-gradient magnetic separation of hematite and uranium-gold leach residues were studied. It is shown that the pre-magnetization of anti-ferromagnetic hematite can enhance the recovery of iron and the grade of the magnetic product. The effect of pre-magnetization was found to increase with decreasing particle size, the recovery from the fraction -12 μm increasing by 11% and the grade of the magnetic concentrate by 30%. The pre-magnetization of paramagnetic uranium-gold leach residues, however, reduced the recovery of uranium. It is suggested that the behaviour of a mineral with an ordered magnetic structure is related to magnetic viscosity. The capital and operating costs of the magnet required for pre-magnetization are assessed. (orig.)

  3. On heteroclinic separators of magnetic fields in electrically conducting fluids

    CERN Document Server

    Grines, V; Pochinka, O; Zhuzhoma, E

    2014-01-01

    In this paper we partly solve the problem of existence of separators of a magnetic field in plasma. We single out in plasma a 3-body with a boundary in which the movement of plasma is of special kind which we call an (a-d)-motion. We prove that if the body is the 3-annulus or the "fat" orientable surface with two holes the magnetic field necessarily have a heteroclinic separator. The statement of the problem and the suggested method for its solution lead to some theoretical problems from Dynamical Systems Theory which are of interest of their own.

  4. Magnetofluidic concentration and separation of non-magnetic particles using two magnet arrays.

    Science.gov (United States)

    Hejazian, Majid; Nguyen, Nam-Trung

    2016-07-01

    The present paper reports the use of diluted ferrofluid and two arrays of permanent magnets for the size-selective concentration of non-magnetic particles. The micro magnetofluidic device consists of a straight channels sandwiched between two arrays of permanent magnets. The permanent magnets create multiple capture zones with minimum magnetic field strength along the channel. The complex interaction between magnetic forces and hydrodynamic force allows the device to operate in different regimes suitable for concentration of non-magnetic particles with small difference in size. Our experimental results show that non-magnetic particles with diameters of 3.1 μm and 4.8 μm can be discriminated and separated with this method. The results from this study could be used as a guide for the design of size-sensitive separation devices for particle and cell based on negative magnetophoresis.

  5. Separation of actinide-made transurania by a gas-filled magnetic separator

    International Nuclear Information System (INIS)

    The performance of the gas-filled magnetic separator HECK at the UNI-LAC at GSI Darmstadt is described. The system consists of a 30 -dipole magnet and a quadrupole doublet of wide aperture. The separator is operated with helium at pressures between (0.1-1) hPa. It is used to investigate heavy ion induced fusion products in-flight. The recoils emerging from a thin target are separated with high efficiency of (10-50)%. The suppression factor of primary beam particles and transfer products is (1015) and (103), respectively. In this application of a gas-filled separator to synthesize transuranium elements using 238U-targets, isotopes of the elements fermium and nobelium were identified in irradiations with 16O- and 20Ne-beams. (orig.)

  6. Passive magnetic separator integrated with microfluidic mixer: Demonstration of enhanced capture efficiency

    DEFF Research Database (Denmark)

    Lund-Olesen, Torsten; Bruus, Henrik; Hansen, Mikkel Fougt

    2006-01-01

    In this paper, we present two results: (1) a new method for quantifying the efficiency of magnetic bead separators by magnetic measurements, and (2) a new idea for designing efficient magnetic bead separators. For microfluidic magnetic separators, a limiting factor for the capture of magnetic bea...

  7. Quantitative Magnetic Separation of Particles and Cells Using Gradient Magnetic Ratcheting.

    Science.gov (United States)

    Murray, Coleman; Pao, Edward; Tseng, Peter; Aftab, Shayan; Kulkarni, Rajan; Rettig, Matthew; Di Carlo, Dino

    2016-04-13

    Extraction of rare target cells from biosamples is enabling for life science research. Traditional rare cell separation techniques, such as magnetic activated cell sorting, are robust but perform coarse, qualitative separations based on surface antigen expression. A quantitative magnetic separation technology is reported using high-force magnetic ratcheting over arrays of magnetically soft micropillars with gradient spacing, and the system is used to separate and concentrate magnetic beads based on iron oxide content (IOC) and cells based on surface expression. The system consists of a microchip of permalloy micropillar arrays with increasing lateral pitch and a mechatronic device to generate a cycling magnetic field. Particles with higher IOC separate and equilibrate along the miropillar array at larger pitches. A semi-analytical model is developed that predicts behavior for particles and cells. Using the system, LNCaP cells are separated based on the bound quantity of 1 μm anti-epithelial cell adhesion molecule (EpCAM) particles as a metric for expression. The ratcheting cytometry system is able to resolve a ±13 bound particle differential, successfully distinguishing LNCaP from PC3 populations based on EpCAM expression, correlating with flow cytometry analysis. As a proof-of-concept, EpCAM-labeled cells from patient blood are isolated with 74% purity, demonstrating potential toward a quantitative magnetic separation instrument. PMID:26890496

  8. Quantitative Magnetic Separation of Particles and Cells Using Gradient Magnetic Ratcheting.

    Science.gov (United States)

    Murray, Coleman; Pao, Edward; Tseng, Peter; Aftab, Shayan; Kulkarni, Rajan; Rettig, Matthew; Di Carlo, Dino

    2016-04-13

    Extraction of rare target cells from biosamples is enabling for life science research. Traditional rare cell separation techniques, such as magnetic activated cell sorting, are robust but perform coarse, qualitative separations based on surface antigen expression. A quantitative magnetic separation technology is reported using high-force magnetic ratcheting over arrays of magnetically soft micropillars with gradient spacing, and the system is used to separate and concentrate magnetic beads based on iron oxide content (IOC) and cells based on surface expression. The system consists of a microchip of permalloy micropillar arrays with increasing lateral pitch and a mechatronic device to generate a cycling magnetic field. Particles with higher IOC separate and equilibrate along the miropillar array at larger pitches. A semi-analytical model is developed that predicts behavior for particles and cells. Using the system, LNCaP cells are separated based on the bound quantity of 1 μm anti-epithelial cell adhesion molecule (EpCAM) particles as a metric for expression. The ratcheting cytometry system is able to resolve a ±13 bound particle differential, successfully distinguishing LNCaP from PC3 populations based on EpCAM expression, correlating with flow cytometry analysis. As a proof-of-concept, EpCAM-labeled cells from patient blood are isolated with 74% purity, demonstrating potential toward a quantitative magnetic separation instrument.

  9. On Poor Separation in Magnetically Driven Shock Tube

    DEFF Research Database (Denmark)

    Chang, C.T.

    1973-01-01

    Observations made at steady-state running conditions in a magnetically driven shock tube, with parallel-plate electrodes, showed that for a given discharge voltage, sufficient separation between the shock and the current-sheet occurred only at relatively high discharge pressures. As a comparison......, poor separations were also noted in conventional diaphragm-type shock tubes running at low initial pressures. It is demonstrated that the observed poor separation can be explained by a mass leakage, instead of through the wall boundary layer, but through the current-sheet itself....

  10. Pair separation of magnetic elements in the quiet Sun

    CERN Document Server

    Giannattasio, F; Biferale, L; Del Moro, D; Sbragaglia, M; Rubio, L Bellot; Gosic, M; Suarez, D Orozco

    2014-01-01

    The dynamic properties of the quiet Sun photosphere can be investigated by analyzing the pair dispersion of small-scale magnetic fields (i.e., magnetic elements). By using $25$ hr-long Hinode magnetograms at high spatial resolution ($0".3$), we tracked $68,490$ magnetic element pairs within a supergranular cell near the disk center. The computed pair separation spectrum, calculated on the whole set of particle pairs independently of their initial separation, points out what is known as a super-diffusive regime with spectral index $\\gamma=1.55\\pm0.05$, in agreement with the most recent literature, but extended to unprecedented spatial and temporal scales (from granular to supergranular). Furthermore, for the first time, we investigated here the spectrum of the mean square displacement of pairs of magnetic elements, depending on their initial separation $r_0$. We found that there is a typical initial distance above (below) which the pair separation is faster (slower) than the average. A possible physical interp...

  11. Separation of the Magnetic Field into External and Internal Parts

    DEFF Research Database (Denmark)

    Olsen, Nils; Glassmeier, K.-H.; Jia, X.

    2010-01-01

    The magnetic field of a planet or a planetary moon contains contributions from a variety of sources in the environment of the body (external sources) and its interior (internal sources). This chapter describes different methods that have been developed for the separation of external and internal...... source contributions, and their application to selected planets and one of Jupiter’s moons, Ganymede....

  12. Metals separation using solvent extractants on magnetic microparticles

    International Nuclear Information System (INIS)

    The magnetically assisted chemical separation program was initially funded by DOE EM-50 to develop processes for the efficient separation of radionuclides and other hazardous metals. This process has simulated the partnership between industry and ANL for many applications related to hazardous metal problems in industry. In-tank or near-tank hazardous metals separation using magnetic particles promises simple, compact processing at very low costs and employs mature chemical separations technologies to remove and recover hazardous metals from aqueous solutions. The selective chemical extractants are attached to inexpensive magnetic carrier particles. Surfaces of small particles composed of rare earths or ferromagnetic materials are treated to retain chemical extractants (e.g., TBP, CMPO, quaternary amines, carboxylic acid). After selective partitioning of contaminants to the surface layer, magnets are used to collect the loaded particles from the tank. The particles can be regenerated by stripping the contaminants and the selective metals can be recovered and recycled from the strip solution. This process and its related equipment are simple enough to be used for recovery/recycling and waste minimization activities at many industrial sites. Both the development of the process for hazardous and radioactive waste and the transfer of the technology will be discussed

  13. TREATMENT OF COMBINED SEWER OVERFLOWS BY HIGH GRADIENT MAGNETIC SEPARATION

    Science.gov (United States)

    Seeded water treatment by high gradient magnetic separation techniques was carried out on combined storm overflows and raw sewage influents. Both bench-type and continuous pilot plant tests were performed to evaluate the effectiveness of the process in purifying waste waters. Cri...

  14. Ultrasound imaging for quantitative evaluation of magnetic density separation

    NARCIS (Netherlands)

    Sanaee, S.A.

    2013-01-01

    This thesis is dedicated to an investigation of the potential and technological possibilities of an inline ultrasound system as a quality control system for wet recycling of solid waste. The main targeted recycling technology is magnetic density separation (MDS), a novel technique that was investiga

  15. Magnetic Separations with Magnetite: Theory, Operation, and Limitations

    Energy Technology Data Exchange (ETDEWEB)

    G. B. Cotten

    2000-08-01

    This dissertation documents the theory development and experimental plan followed to describe how a magnetite-based column under the influence of an external magnetic field functions as a magnetic separator. Theoretical simulations predict that weekly paramagnetic particles in the sub-micron range can be magnetically separated while diamagnetic particles as large as 2 microns in diameter may pass. Magnetite-based columns were evaluated as magnetically-controllable enhanced filtration devices. There was no evidence of enhanced filtration for diamagnetic particles by the magnetite-based bed. Magnetite-based magnetic separators have proven to be effective in specific laboratory experiments, indicating a potential feasibility for scale-up operations. Column media-filter type filtration effects indicate a magnetite-based column would not be suitable for treatment of a waste stream with a high diamagnetic solids content or high volume throughput requirements. Specific applications requiring removal of sub-micron para- or ferromagnetic particles under batch or Stokes flow conditions would be most applicable.

  16. Magnetic Separations with Magnetite: Theory, Operation, and Limitations

    International Nuclear Information System (INIS)

    This dissertation documents the theory development and experimental plan followed to describe how a magnetite-based column under the influence of an external magnetic field functions as a magnetic separator. Theoretical simulations predict that weekly paramagnetic particles in the sub-micron range can be magnetically separated while diamagnetic particles as large as 2 microns in diameter may pass. Magnetite-based columns were evaluated as magnetically-controllable enhanced filtration devices. There was no evidence of enhanced filtration for diamagnetic particles by the magnetite-based bed. Magnetite-based magnetic separators have proven to be effective in specific laboratory experiments, indicating a potential feasibility for scale-up operations. Column media-filter type filtration effects indicate a magnetite-based column would not be suitable for treatment of a waste stream with a high diamagnetic solids content or high volume throughput requirements. Specific applications requiring removal of sub-micron para- or ferromagnetic particles under batch or Stokes flow conditions would be most applicable

  17. Magnetic separation using high-T sub c superconductors

    CERN Document Server

    Bolt, L

    2001-01-01

    sensitivity of the high-T sub c material to magnetic fields. Finite elements modelling of the system has provided the framework for the quantitative analysis of the magnetic field distributions on the coil windings and the optimisation of the system configuration. The performance of the separator has been tested at 77 K with liquid nitrogen at atmospheric pressure, and at a temperature approx = 67 K by pumping liquid nitrogen at a pressure around 100 Torr. The highest field obtained in the air gap at 67 K was of 340 mT. Magnetic separators with an iron circuit have been in operation for many years in mineral industry, and there appear to be an opportunity of building machines with high-T sub c coils or retrofitting existing machines with high-T sub c coils to run them closer to saturation in a cheap and effective way. Superconductivity has found in magnetic separation one of its major industrial applications second only to magnetic resonance imaging. Low-T sub c superconducting coils have been employed in Hig...

  18. The rate of separation of magnetic lines of force in a random magnetic field.

    Science.gov (United States)

    Jokipii, J. R.

    1973-01-01

    The mixing of magnetic lines of force, as represented by their rate of separation, as a function of distance along the magnetic field, is considered with emphasis on neighboring lines of force. This effect is particularly important in understanding the transport of charged particles perpendicular to the average magnetic field. The calculation is carried out in the approximation that the separation changes by an amount small compared with the correlation scale normal to the field, in a distance along the field of a few correlation scales. It is found that the rate of separation is very sensitive to the precise form of the power spectrum. Application to the interplanetary and interstellar magnetic fields is discussed, and it is shown that in some cases field lines, much closer together than the correlation scale, separate at a rate which is effectively as rapid as if they were many correlation lengths apart.

  19. Magnetic separation of iron-based nanosorbents from watery solutions

    Science.gov (United States)

    Medvedeva, Irina; Bakhteeva, Iuliia; Zhakov, Sergey; Baerner, Klaus

    2016-04-01

    Iron and iron oxide magnetic nanoparticles (MNP) both naked and with chemically modified surface are promising agents for different environmental applications, in particular for water purification and for analytical control of water and soil pollution. The MNP can be used as sorbents with selective abilities due to designed surface functionalization. While a lot of research has been devoted to the impurity sorption processes, the second part, that is the efficient removal of the MNP sorbents from the watery solution, has not been sufficiently studied so far. For that particles with magnetic cores are especially attractive due to the possibility of their subsequent magnetic separation from water without using coagulants, i.e. without a secondary water pollution, just by applying external magnetic fields B. In order to remove magnetic sorbent nanoparticles ( 10-100 nm) effectively from the water solution gradient magnetic fields are required. Depending on the MNP size, the magnetic moment, the chemical properties of the solution, the water purification conditions , either the low gradient magnetic separation (LGMS) with dB/dz 100 T/m is used. The gradient magnetic field is provided by permanent magnets or electromagnets of different configuration. In this work the sedimentation dynamics of naked Fe3O4 and Fe3O4@SiO2 nanoparticles (10-30 nm) in water was studied in a vertical gradient magnetic field (B1 ≤ 0.3T, dB/dz ≤ 0.13 T/cm). By this LGMS , the sedimentation time of the naked Fe3O4 NP is reduced down from several days to several minutes. The sedimentation time for Fe3O4@SiO2 decreases from several weeks to several hours and to several minutes when salts Na2SO4, CaCl2, NaH2PO4 are added to the solution. The results are interpreted in terms of MNP aggregate formation caused by electrostatic, steric and magnetic inter-particle interactions in the watery solution. ACKNOWLEDGMENTS The work was supported in part by the Ural Branch, Russian Academy of Sciences

  20. Upgrading mixed polyolefin waste with magnetic density separation.

    Science.gov (United States)

    Bakker, E J; Rem, P C; Fraunholcz, N

    2009-05-01

    Polyolefin fractions are often end fractions resulting from the recycling of end-of-life consumer products. Polypropylene (PP) and polyethylene (PE) are present in such fractions as a mixture. For instance, the ratio of PP and PE in car scrap is 70:30 on average. However, the grade of the PP and PE should typically be better than 97% to be reused again as a high quality product. Density separation of the different polyolefins can be a solution. A promising separation technique is the inverse magnetic density separator (IMDS). This paper discusses the potential of shredder residue, one of the possible polyolefin's waste stream sources for the IMDS, in detail. Experiments with the separation of polyolefins with an IMDS prototype show both high grade and high recovery. The paper concludes with the economic opportunities of the IMDS in the recycling of polyolefins. PMID:19128952

  1. Study on magnetic separation for decontamination of cesium contaminated soil by using superconducting magnet

    International Nuclear Information System (INIS)

    Highlights: • The method for the soil decontamination by the superconducting magnet is proposed. • Magnetic separation of clay minerals was performed by HGMS. • Soil separation ratio was evaluated by quantitative analysis using XRD. • It is expected that HGMS can be applied to the actual soil decontamination. - Abstract: The accident of Fukushima Daiichi nuclear power plant caused the diffusion of radioactive cesium over the wide area. We examined the possibility of applying magnetic separation method using the superconducting magnet, which can process a large amount of the soil in high speed, to the soil decontamination and volume reduction of the radioactive cesium contaminated soil. Clay minerals are classified as 2:1 and 1:1 types by the difference of their layer structures, and these types of minerals are respectively paramagnetic and diamagnetic including some exception. It is known that most of the radioactive cesium is strongly adsorbed on the clay, especially on 2:1 type clay minerals. It is expected that the method which can separate only 2:1 type clay minerals selectively from the mixture clay minerals can enormously contribute to the volume reduction of the contaminated soil. In this study, the components in the clay before and after separation were evaluated to estimate the magnetic separation efficiency by using X-ray diffraction. From the results, the decontamination efficiency and the volume reduction ratio were estimated in order to examine the appropriate separation conditions for the practical decontamination of the soil

  2. Study on magnetic separation for decontamination of cesium contaminated soil by using superconducting magnet

    Energy Technology Data Exchange (ETDEWEB)

    Igarashi, Susumu, E-mail: igarashi@qb.see.eng.osaka-u.ac.jp; Nomura, Naoki; Mishima, Fumihito; Akiyama, Yoko, E-mail: yoko-ak@see.eng.osaka-u.ac.jp

    2014-09-15

    Highlights: • The method for the soil decontamination by the superconducting magnet is proposed. • Magnetic separation of clay minerals was performed by HGMS. • Soil separation ratio was evaluated by quantitative analysis using XRD. • It is expected that HGMS can be applied to the actual soil decontamination. - Abstract: The accident of Fukushima Daiichi nuclear power plant caused the diffusion of radioactive cesium over the wide area. We examined the possibility of applying magnetic separation method using the superconducting magnet, which can process a large amount of the soil in high speed, to the soil decontamination and volume reduction of the radioactive cesium contaminated soil. Clay minerals are classified as 2:1 and 1:1 types by the difference of their layer structures, and these types of minerals are respectively paramagnetic and diamagnetic including some exception. It is known that most of the radioactive cesium is strongly adsorbed on the clay, especially on 2:1 type clay minerals. It is expected that the method which can separate only 2:1 type clay minerals selectively from the mixture clay minerals can enormously contribute to the volume reduction of the contaminated soil. In this study, the components in the clay before and after separation were evaluated to estimate the magnetic separation efficiency by using X-ray diffraction. From the results, the decontamination efficiency and the volume reduction ratio were estimated in order to examine the appropriate separation conditions for the practical decontamination of the soil.

  3. Exploiting Size-Dependent Drag and Magnetic Forces for Size-Specific Separation of Magnetic Nanoparticles

    OpenAIRE

    Hunter B. Rogers; Tareq Anani; Young Suk Choi; Beyers, Ronald J.; David, Allan E.

    2015-01-01

    Realizing the full potential of magnetic nanoparticles (MNPs) in nanomedicine requires the optimization of their physical and chemical properties. Elucidation of the effects of these properties on clinical diagnostic or therapeutic properties, however, requires the synthesis or purification of homogenous samples, which has proved to be difficult. While initial simulations indicated that size-selective separation could be achieved by flowing magnetic nanoparticles through a magnetic field, sub...

  4. Capture of metallic copper by high gradient magnetic separation system.

    Science.gov (United States)

    Wu, Wan-I; Wu, Chung-Hsin; Hong, P K Andy; Lin, Cheng-Fang

    2011-10-01

    Valence copper was recovered from wastewater by chemical reduction and use of a high gradient magnetic separation (HGMS) system. Ammonia (NH3) and sodium dithionate (Na2S2O4) at a molar ratio of [Cu]:[NH3]:[Na2S2O4] = 1:4:3 at pH = 9.5 were used first to chemically reduce copper ion to metallic copper; the resultant metal solids were captured in an upflowing reactor space equipped with a permalloy matrix net under a high gradient magnetic field. The captured solids were predominantly 6-20 microm in diameter, with Cu2O and CuO present among the solids. Four treatment configurations with and without the use of magnetic field and metal alloy as the matrix net were tested and their effects evaluated: (1) no magnetic field or matrix, (2) no magnetic field but with matrix, (3) with magnetic field but no matrix, (4) with both magnetic field and matrix. At flow rates of 40, 60, 80 and 100 cm3/min, capture efficiencies for metallic copper in the absence of magnetic field were 87%, 86%, 63%, and 39%, respectively, and in the presence of magnetic field were 99%, 98%, 95%, and 93%, respectively. The HGMS was critical for a high capture efficiency, whereas a matrix net only marginally enhanced it. Additional tests with a larger reactor confirmed similarly high efficiencies of > 85%. The use of an alloy matrix appeared to be important when high flow rates are most likely to be employed in practical applications. PMID:22329132

  5. The Barrier Magnetic Separator for the Treatment of Weakly Magnetic Ores: Laboratoryscale Investigations and Industrial Tests

    OpenAIRE

    Turkenich, A. M.; Baranov, U. D.; Ruditsky, A. V.

    2002-01-01

    The principle of action of the barrier separator for beneficiation of coarse weakly magnetic ores is described. New data of laboratory-scale investigations of beneficiation of manganese ore and mineral sands are introduced. The results of tests in the Volnogorsk State Mining and Metallurgical Plant (VSMMP) show high technological effectiveness and reliability of the experimental separator.

  6. Separation of core and crustal magnetic field sources

    Science.gov (United States)

    Shure, L.; Parker, R. L.; Langel, R. A.

    1985-01-01

    Fluid motions in the electrically conducting core and magnetized crustal rocks are the two major sources of the magnetic field observed on or slightly above the Earth's surface. The exact separation of these two contributions is not possible without imposing a priori assumptions about the internal source distribution. Nonetheless models like these were developed for hundreds of years Gauss' method, least squares analysis with a truncated spherical harmonic expansion was the method of choice for more than 100 years although he did not address separation of core and crustal sources, but rather internal versus external ones. Using some arbitrary criterion for appropriate truncation level, we now extrapolate downward core field models through the (approximately) insulating mantle. Unfortunately our view can change dramatically depending on the degree of truncation for describing core sources.

  7. Magnetic Separation for Nuclear Material Detection and Surveillance

    International Nuclear Information System (INIS)

    A high performance superconducting magnet is being developed for particle retrieval from field collected samples. Results show that maximum separation effectiveness is obtained when the matrix fiber diameter approaches the diameter of the particles to be captured. Experimentally, the authors obtained a single particle capture limit with 0.8microm PuO2 particles with dodecane as a carrier fluid. The development of new matrix materials is being pursued through the controlled corrosion of stainless steel wool, or the deposition of nickel dendrites on the existing stainless steel matrix material. They have also derived a model from a continuity equation that uses empirically determined capture cross section values. This enables the prediction of high gradient magnetic separator performance for a variety of materials and applications. The model can be used to optimize the capture cross section and thus increase the capture efficiency

  8. Study on Removal of Bilirubin with Magnetic Affinity Separation Technique

    Institute of Scientific and Technical Information of China (English)

    张凤宝; 王淑兰; 徐辉; 张国亮

    2003-01-01

    An affinity adsorbent, Cibacron Blue 3GA immobilized magnetic polyvinyl alcohol (PVA) microspheres was used for bilirubin removal taking the advantage of easy separation of magnetic sorbent from the biosystem.Fe3 O4 superparamagnetic particles was synthesized with hydrothermal reaction of ferrous chloride (FeC12) and ferric chloride (FeCl3). Such magnetic particles are then encapsulated in biocompatible PVA to form magnetic polymer microspheres sized from 2 to 15 nm with hydroxyl groups on its surface. Cibacron Blue 3GA, a dye-ligand, was covalently coupled with the polyvinyl alcohol through the nucleophilic reaction between the chloride of its triazine ring and the hydroxyl groups of PVA molecules under alkaline condition. The affinity adsorbent carried 21.1μmol Cibacron Blue 3GA per gram magnetic polymer microspheres was used to remove unconjugated and conjugated bilirubin from the solution which was composed of bilirubin or bilirubin and protein. After the adsorption, the adsorbent loaded with bilirubin was removed easily in the magnetic field.

  9. Theoretical Assessment of Technological Potential of Magnetic and Electrical Separation

    OpenAIRE

    Karmazin, V. V.

    1997-01-01

    Magnetic, electrical an combined methods of mineral beneficiation are widely used in various branches of mining industry. These processes have significant economic and ecological advantages in those areas where they can be applied technologically. It is thus necessary to analyse technological possibilities and areas of potential applications. Different designs of the separators must also be considered. Such an attempt is being done in this article based on the assessment of the level of diffe...

  10. Radiation Resistant Magnets for the RIA Fragment Separator

    CERN Document Server

    Zeller, Al; Gupta, Ramesh C; Ronningen, Reginald; Sherrill, Bradley

    2005-01-01

    The high radiation fields around the production target and the beam dump in the fragment separator at the Rare Isotope Accelerator requires that radiation resistant magnets be used. Because large apertures and high gradients are required for the quadrupoles and similar demanding requirements for the dipole and sextupoles, resistive coils are difficult to justify. The radiation heating of any materials at liquid helium temperatures also requires that superconducting versions of the magnets have low cold-masses. The final optical design has taken the practical magnets limits into account and sizes and fields adjusted to what is believed to be achievable with technology that is possible with sufficient R&D. Designs with higher obtainable current densities and having good radiation tolerances that use superconducting coils are presented, as well as the radiation transport calculations that drive the material parameters.

  11. Radiolysis and hydrolysis of magnetically assisted chemical separation particles

    International Nuclear Information System (INIS)

    The magnetically assisted chemical separation (MACS) process is designed to separate transuranic (TRU) elements out of high-level waste (HLW) or TRU waste. Magnetic microparticles (1--25 μm) were coated with octyl (phenyl)N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) dissolved in tributyl phosphate (TBP) and tested for removing TRU elements from acidic nitrate solutions. The particles were contacted with nitric acid solutions and Hanford plutonium finishing plant (PFP) simulant, irradiated with a high intensity 60Co γ-ray source, and evaluated for effectiveness in removing TRU elements from 2m HNO3 solutions. The resistance of the coatings and magnetic cores to radiolytic damage and hydrolytic degradation was investigated by irradiating samples of particles suspended in a variety of solutions with doses of up to 5 Mrad. Transmission electron microscopy (TEM), magnetic susceptibility measurements, and physical observations of the particles and suspension solutions were used to assess physical changes to the particles. Processes that affect the surface of the particles dramatically alter the binding sites for TRU in solution. Hydrolysis played a larger role than radiolysis in the degradation of the extraction capacity of the particles

  12. Development of magnetic separator for deironing of paint industrial stock

    Energy Technology Data Exchange (ETDEWEB)

    Bohm, J.; Csoke, B.; Antal, G. [Univ. of Miskolc (Hungary). Dept. of Process Engineering

    1995-12-31

    From the waste material of the production of aluminum foil aluminum pigment is produced for the paint industry by grinding it in white spirit. During grinding 1--2% iron impurity gets into the product, weakening its quality, from the war of the mill armor and the grinding bodies and from the contamination of the raw material. For deironing the product, a stage-operated electrically induced magnetic filter separator was developed and put into operation. The separator was sited in an explosive environment and therefore required a special design and safety system. The paper describes the results of the development work, the device that was developed, the safety system as well as the results of and experiences with the operation of the separator.

  13. On-chip magnetic bead microarray using hydrodynamic focusing in a passive magnetic separator.

    Science.gov (United States)

    Smistrup, K; Kjeldsen, B G; Reimers, J L; Dufva, M; Petersen, J; Hansen, M F

    2005-11-01

    Implementing DNA and protein microarrays into lab-on-a-chip systems can be problematic since these are sensitive to heat and strong chemicals. Here, we describe the functionalization of a microchannel with two types of magnetic beads using hydrodynamic focusing combined with a passive magnetic separator with arrays of soft magnetic elements. The soft magnetic elements placed on both sides of the channel are magnetized by a relatively weak applied external magnetic field (21 mT) and provide magnetic field gradients attracting magnetic beads. Flows with two differently functionalized magnetic beads and a separating barrier flow are introduced simultaneously at the two channel sides and the centre of the microfluidic channel, respectively. On-chip experiments with fluorescence labeled beads demonstrate that the two types of beads are captured at each of the channel sidewalls. On-chip hybridization experiments show that the microfluidic systems can be functionalized with two sets of beads carrying different probes that selectively recognize a single base pair mismatch in target DNA. By switching the places of the two types of beads it is shown that the microsystem can be cleaned and functionalized repeatedly with different beads with no cross-talk between experiments. PMID:16234958

  14. Photocatalytically active titanium dioxide nanopowders: Synthesis, photoactivity and magnetic separation

    International Nuclear Information System (INIS)

    Two approaches were used to obtain nanocrystalline titanium dioxide (TiO2) photocatalyst powders. Firstly, low-temperature synthesis method and secondly liquid flame spraying. The structural properties of the produced powders were determined with X-ray diffraction, transmission electron microscopy and nitrogen adsorption tests. The photocatalytic properties of the powders were studied with methylene blue (MB) discoloration tests. After discolorations tests, TiO2 was coagulated with magnetite particles using FeCl3·6 H2O at a fixed pH value. Magnetic separation of coagulated TiO2 and magnetite was carried out by a permanent magnet. The obtained results showed that the particle size of the powders synthesized at low-temperature was very small and the specific surface area high. The phase content of the powder was also shown to depend greatly on the acidity of the synthesis solution. Powder synthesized by liquid flame spraying was mixture of anatase and rutile phases with essentially larger particle size and lower specific surface area than those of low-temperature synthesized powders. The MB discoloration test showed that photocatalytic activity depends on the phase structure as well as the specific surface area of the synthesized TiO2 powder. The magnetic separation of TiO2–magnetite coagulate from solution proved to be efficient around pH:8

  15. Magnetically separable titania-coated nickel ferrite photocatalyst

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Yun Seup; Park, Seung Bin; Kang, Duk-Won

    2004-08-15

    A magnetically separable photocatalyst was prepared by a continuous multi-step spray pyrolysis process. In the first step, nickel ferrite core particles were prepared by an ultrasonic spray pyrolysis. In the second step, tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TTIP) were sequentially injected and coated on the surface of the core particles. The sequentially coated layers were decomposed to form silica and titania layers in a final furnace reactor. The titania-silica layered particles displayed higher photoactivity than particles coated only with titania and titania-silica mixture-coated particles. The photoactivity of the titania-silica layered particles remained unchanged after magnetic separation and washing. This confirms that the adhesion between the core particles and the coated layer is strong enough to withstand vigorous mixing. It also implies that the formation of free particles of silica or titania is negligible in the second reactor. The strong adhesion between the coated layer and the nickel ferrite core is attributed to the features of the multi-step process, wherein the core particles are exposed to high temperate in the second reactor for only a few seconds and transformation of the core particles into non-magnetic particles is prohibited.

  16. Plasma separation process: Magnet move to Oak Ridge National Laboratory

    International Nuclear Information System (INIS)

    This is the final report on the series of operations which culminated with the delivery of the Plasma Separation Process prototype magnet system (PMS) to Building K1432 at Oak Ridge National Laboratory (ORNL). This procedure included real time monitoring of the cold mass support strut strain gauges and an in-cab rider to monitor the instrumentation and direct the driver. The primary technical consideration for these precautions was the possibility of low frequency resonant vibration of the cold mass when excited by symmetrical rough road conditions at specific speeds causing excess stress levels in the support struts and consequent strut failure. A secondary consideration was the possibility of high acceleration loads due to sudden stops, severe road conditions, of impacts. The procedure for moving and transportation to ORNL included requirements for real time continuous monitoring of the eight strut stain gauges and three external accelerometers. Because the strain gauges had not been used since the original magnet cooldown, it was planned to verify their integrity during magnet warmup. The measurements made from the strut strain gauges resulted in stress values that were physically impossible. It was concluded that further evaluation was necessary to verify the usefulness of these gauges and whether they might be faulty. This was accomplished during the removal of the magnet from the building. 6 figs., 1 tab

  17. Research on the magnetic separation technology for the treatment of radioactive waste water

    Energy Technology Data Exchange (ETDEWEB)

    Jun, Byung Hyuk; Kim, Chan Joong; Park, Soon Dong; Lee, D. G.; Kim, K. M.

    2012-07-15

    The literature survey for the synthesis technology of magnetic compounds for the magnetic separation of radioactive waste water was performed. The cryocooler with high power of 10 K and closed cycle cryostat for magnetic field trap were designed and fabricated. The superconductor bulks of single crystals (3 cm size) for permanent magnet were fabricated successfully. The experiments of magnetic trapping and magnetic separation for Fe contaminated water were performed using cryocooler, cryostat and the superconductors.

  18. Magnetic microgels, a promising candidate for enhanced magnetic adsorbent particles in bioseparation: synthesis, physicochemical characterization, and separation performance.

    Science.gov (United States)

    Turcu, Rodica; Socoliuc, Vlad; Craciunescu, Izabell; Petran, Anca; Paulus, Anja; Franzreb, Matthias; Vasile, Eugeniu; Vekas, Ladislau

    2015-02-01

    For specific applications in the field of high gradient magnetic separation of biomaterials, magnetic nanoparticle clusters of controlled size and high magnetic moment in an external magnetic field are of particular interest. We report the synthesis and characterization of magnetic microgels designed for magnetic separation purposes, as well as the separation efficiency of the obtained microgel particles. High magnetization magnetic microgels with superparamagnetic behaviour were obtained in a two-step synthesis procedure by a miniemulsion technique using highly stable ferrofluid on a volatile nonpolar carrier. Spherical clusters of closely packed hydrophobic oleic acid-coated magnetite nanoparticles were coated with cross linked polymer shells of polyacrylic acid, poly-N-isopropylacrylamide, and poly-3-acrylamidopropyl trimethylammonium chloride. The morphology, size distribution, chemical surface composition, and magnetic properties of the magnetic microgels were determined using transmission electron microscopy, X-ray photoelectron spectroscopy, and vibrating sample magnetometry. Magnetically induced phase condensation in aqueous suspensions of magnetic microgels was investigated by optical microscopy and static light scattering. The condensed phase consists of elongated oblong structures oriented in the direction of the external magnetic field and may grow up to several microns in thickness and tens or even hundreds of microns in length. The dependence of phase condensation magnetic supersaturation on the magnetic field intensity was determined. The experiments using high gradient magnetic separation show high values of separation efficiency (99.9-99.97%) for the magnetic microgels. PMID:25519891

  19. Microfluidic separation of magnetic nanoparticles on an ordered array of magnetized micropillars

    Science.gov (United States)

    Orlandi, G.; Kuzhir, P.; Izmaylov, Y.; Alves Marins, J.; Ezzaier, H.; Robert, L.; Doutre, F.; Noblin, X.; Lomenech, C.; Bossis, G.; Meunier, A.; Sandoz, G.; Zubarev, A.

    2016-06-01

    Microfluidic separation of magnetic particles is based on their capture by magnetized microcollectors while the suspending fluid flows past the microcollectors inside a microchannel. Separation of nanoparticles is often challenging because of strong Brownian motion. Low capture efficiency of nanoparticles limits their applications in bioanalysis. However, at some conditions, magnetic nanoparticles may undergo field-induced aggregation that amplifies the magnetic attractive force proportionally to the aggregate volume and considerably increases nanoparticle capture efficiency. In this paper, we have demonstrated the role of such aggregation on an efficient capture of magnetic nanoparticles (about 80 nm in diameter) in a microfluidic channel equipped with a nickel micropillar array. This array was magnetized by an external uniform magnetic field, of intensity as low as 6-10 kA/m, and experiments were carried out at flow rates ranging between 0.3 and 30 μ L /min . Nanoparticle capture is shown to be mostly governed by the Mason number Ma, while the dipolar coupling parameter α does not exhibit a clear effect in the studied range, 1.4 < α < 4.5. The capture efficiency Λ shows a strongly decreasing Mason number behavior, Λ ∝M a-1.78 within the range 32 ≤ Ma ≤ 3250. We have proposed a simple theoretical model which considers destructible nanoparticle chains and gives the scaling behavior, Λ ∝M a-1.7 , close to the experimental findings.

  20. The magnetic monopole and the separation between fast and slow magnetic degrees of freedom.

    Science.gov (United States)

    Wegrowe, J-E; Olive, E

    2016-03-16

    The Landau-Lifshitz-Gilbert (LLG) equation that describes the dynamics of a macroscopic magnetic moment finds its limit of validity at very short times. The reason for this limit is well understood in terms of separation of the characteristic time scales between slow degrees of freedom (the magnetization) and fast degrees of freedom. The fast degrees of freedom are introduced as the variation of the angular momentum responsible for the inertia. In order to study the effect of the fast degrees of freedom on the precession, we calculate the geometric phase of the magnetization (i.e. the Hannay angle) and the corresponding magnetic monopole. In the case of the pure precession (the slow manifold), a simple expression of the magnetic monopole is given as a function of the slowness parameter, i.e. as a function of the ratio of the slow over the fast characteristic times.

  1. The magnetic monopole and the separation between fast and slow magnetic degrees of freedom

    International Nuclear Information System (INIS)

    The Landau–Lifshitz–Gilbert (LLG) equation that describes the dynamics of a macroscopic magnetic moment finds its limit of validity at very short times. The reason for this limit is well understood in terms of separation of the characteristic time scales between slow degrees of freedom (the magnetization) and fast degrees of freedom. The fast degrees of freedom are introduced as the variation of the angular momentum responsible for the inertia. In order to study the effect of the fast degrees of freedom on the precession, we calculate the geometric phase of the magnetization (i.e. the Hannay angle) and the corresponding magnetic monopole. In the case of the pure precession (the slow manifold), a simple expression of the magnetic monopole is given as a function of the slowness parameter, i.e. as a function of the ratio of the slow over the fast characteristic times. (paper)

  2. Primary beneficiation of tantalite using magnetic separation and acid leaching

    Institute of Scientific and Technical Information of China (English)

    M Nete; F Koko; T Theron; W Purcell; JT Nel

    2014-01-01

    Primary beneficiation was successfully performed prior to dissolution of manganotantalite (sample A) and ferrotantalite (sample C) samples obtained from two different mines in the Naquissupa area, Mozambique. Magnetic separation removed the majority of iron and tita-nium, whereas H2SO4 leaching removed a large portion of thorium and uranium in these samples. Analytical results indicated that 64.14wt%and 72.04wt%of the total Fe and Ti, respectively, and~2wt%each of Nb2O5 and Ta2O5 were removed from sample C (ferrotantalite) using the magnetic separation method, whereas only 9.64wt%and 8.66wt%of total Fe2O3 and TiO2, respectively, and~2wt%each of Nb2O5 and Ta2O5 were removed from sample A (manganotantalite). A temperature of 50°C and a leaching time of 3 h in the presence of concentrated H2SO4 were observed to be the most appropriate leaching conditions for removal of radioactive elements from the tantalite ores. The results obtained for sample A under these conditions indicated that 64.14wt%U3O8 and 60.77wt%ThO2 were leached into the acidic solution, along with 4.45wt%and 0.99wt%of Nb2O5 and Ta2O5, respectively.

  3. On-chip Magnetic Separation and Cell Encapsulation in Droplets

    Science.gov (United States)

    Chen, A.; Byvank, T.; Bharde, A.; Miller, B. L.; Chalmers, J. J.; Sooryakumar, R.; Chang, W.-J.; Bashir, R.

    2012-02-01

    The demand for high-throughput single cell assays is gaining importance because of the heterogeneity of many cell suspensions, even after significant initial sorting. These suspensions may display cell-to-cell variability at the gene expression level that could impact single cell functional genomics, cancer, stem-cell research and drug screening. The on-chip monitoring of individual cells in an isolated environment could prevent cross-contamination, provide high recovery yield and ability to study biological traits at a single cell level These advantages of on-chip biological experiments contrast to conventional methods, which require bulk samples that provide only averaged information on cell metabolism. We report on a device that integrates microfluidic technology with a magnetic tweezers array to combine the functionality of separation and encapsulation of objects such as immunomagnetically labeled cells or magnetic beads into pico-liter droplets on the same chip. The ability to control the separation throughput that is independent of the hydrodynamic droplet generation rate allows the encapsulation efficiency to be optimized. The device can potentially be integrated with on-chip labeling and/or bio-detection to become a powerful single-cell analysis device.

  4. Thorium-uranium processing with gravity, magnetic and electrical separation in zarigan ore deposit

    International Nuclear Information System (INIS)

    Because of low grade of thorium and uranium in the Zarigan mineral deposit, the pre-concentration operation prior to leaching is necessary. From X-ray diffraction analysis results, it was clear that this ore has large amount of other minerals such as Feldespat, Quartz, Hematite, Titanomagnetite, and rare earths. In this paper the thorium enhancement grade in Zarigan deposit by using gravity, magnetic and electrical separations methods is reported. The output of a Jaw crusher was ground to 85 micron by using ball mill. Then about 95% of SiO2 was separated by using shaking table separation. The heavy concentrate of shaking table was processed by a high intensity magnetic separator and then the magnetic concentrate separated by a low intensity magnetic separator. Finally, the non magnetic concentrate of low magnetic separator was processed with the electrical separation. The grades of thorium and uranium in the non magnetic concentrate of low magnetic separator were increased to 4000 and 5000 ppm, respectively where only 15% of the initial feed (ore) was transferred to this concentrate. Therefore, this resulted in a decrease of acid consumption in the leaching processes and the efficiency enhancement of the process. The pre-treatment circuit of this ore was designed as Jaw crusher/ball mill/shaking table/high-magnetic separator/low-magnetic separator/electrical separator, respectively.

  5. Theoretical analysis of a new, efficient microfluidic magnetic bead separator based on magnetic structures on multiple length scales

    DEFF Research Database (Denmark)

    Smistrup, Kristian; Bu, Minqiang; Wolff, Anders;

    2008-01-01

    We present a theoretical analysis of a new design for microfluidic magnetic bead separation. It combines an external array of mm-sized permanent magnets with magnetization directions alternating between up and down with mu m-sized soft magnetic structures integrated in the bottom of the separation...... channel. The concept is studied analytically for simple representative geometries and by numerical simulation of an experimentally realistic system geometry. The array of permanent magnets provides long-range magnetic forces that attract the beads to the channel bottom, while the soft magnetic elements...

  6. Magnetic Separation Research: A Survey of Some Activities in The Netherlands

    OpenAIRE

    Kerkdijk, C. B. W.; van Kleef, R. P. A. R.; Roeterdink, J. A.

    1984-01-01

    A survey of magnetic separation research at FDO Engineering consultants, the University of Nijmegen, and the Energy Research Foundation (ECN) will be given.FDO efforts were primarily on coal cleaning using the high gradient magnetic separation (HGMS) technique. The Institute for Materials of the University of Nijmegen performs fundamental studies on magnetic flocculation. A continuous flow magnetic separator is briefly described. The Energy Research Foundation has built and operates an HGMS–s...

  7. STUDY ON THE SEPARATION AND UTILIZATION TECHNOLOGY OF MAGNETIC BEAD IN FLY ASH

    Institute of Scientific and Technical Information of China (English)

    边炳鑫; 李哲; 吕一波; 石宪奎; 韦鲁滨

    2000-01-01

    On the basis of study on physical and chemical properties of magnetic bead (MB) in fly ash (FA), the paper gives out the separation methods of MB and results of three separating process. The result of comparative test in size, density, stability, magnetic material content, specific magnetic susceptibility (SMS), medium recovery oxidation resistance and wear resistance between MB and magnetic fines currently used in dense medium separation leads to that using MB recovered from fly ash is used as medium solids in coal cleaning in stead of magnetic fines not only have no influence upon taryests of separation, but can bring good economic and social benefits.

  8. Tracing magnetic separators and their dependence on IMF clock angle in global magnetospheric simulations

    CERN Document Server

    Komar, C M; Dorelli, J C; Glocer, A; Kuznetsova, M M

    2013-01-01

    A new, efficient, and highly accurate method for tracing magnetic separators in global magnetospheric simulations with arbitrary clock angle is presented. The technique is to begin at a magnetic null and iteratively march along the separator by finding where four magnetic topologies meet on a spherical surface. The technique is verified using exact solutions for separators resulting from an analytic magnetic field model that superposes dipolar and uniform magnetic fields. Global resistive magnetohydrodynamic simulations are performed using the three-dimensional BATS-R-US code with a uniform resistivity, in eight distinct simulations with interplanetary magnetic field (IMF) clock angles ranging from 0 (parallel) to 180 degrees (anti-parallel). Magnetic nulls and separators are found in the simulations, and it is shown that separators traced here are accurate for any clock angle, unlike the last closed field line on the Sun-Earth line that fails for southward IMF. Trends in magnetic null locations and the struc...

  9. Adsorption of Methyl Orange on Magnetically Separable Mesoporous Titania Nanocomposite☆

    Institute of Scientific and Technical Information of China (English)

    Libo Gao; Qiang Zhang; Junyang Li; Ruiting Feng; Hongyan Xu; Chenyang Xue

    2014-01-01

    The adsorption of mesoporous Fe3O4–SiO2–TiO2 (MFST), which can be separated easily from solution by a mag-net, for the removal of methyl orange (MO) was investigated. The nitrogen adsorption–desorption measurement shows successful synthesis of MFST with an average pore size of 3.8 nm and a large specific surface area of 55 m2·g−1. About 95%adsorption percentage of MO is achieved with an initial concentration of 10 mg·L−1 in the dark and the MFST exhibits superior adsorption ability under acid conditions. The adsorption data fit wel with the pseudo-second order model for adsorption. After 4 cycles, the adsorption rate for MO remains 74%in the dark and the MFST can be recovered in a magnetic field with a recovery of about 80%(by mass). It demon-strates that the samples have significant value on applications of wastewater treatment.

  10. Digital microfluidic magnetic separation for particle-based immunoassays.

    Science.gov (United States)

    Ng, Alphonsus H C; Choi, Kihwan; Luoma, Robert P; Robinson, John M; Wheeler, Aaron R

    2012-10-16

    We introduce a new format for particle-based immunoassays relying on digital microfluidics (DMF) and magnetic forces to separate and resuspend antibody-coated paramagnetic particles. In DMF, fluids are electrostatically controlled as discrete droplets (picoliters to microliters) on an array of insulated electrodes. By applying appropriate sequences of potentials to these electrodes, multiple droplets can be manipulated simultaneously and various droplet operations can be achieved using the same device design. This flexibility makes DMF well-suited for applications that require complex, multistep protocols such as immunoassays. Here, we report the first particle-based immunoassay on DMF without the aid of oil carrier fluid to enable droplet movement (i.e., droplets are surrounded by air instead of oil). This new format allowed the realization of a novel on-chip particle separation and resuspension method capable of removing greater than 90% of unbound reagents in one step. Using this technique, we developed methods for noncompetitive and competitive immunoassays, using thyroid stimulating hormone (TSH) and 17β-estradiol (E2) as model analytes, respectively. We show that, compared to conventional methods, the new DMF approach reported here reduced reagent volumes and analysis time by 100-fold and 10-fold, respectively, while retaining a level of analytical performance required for clinical screening. Thus, we propose that the new technique has great potential for eventual use in a fast, low-waste, and inexpensive instrument for the quantitative analysis of proteins and small molecules in low sample volumes. PMID:23013543

  11. Collection of Ni-bearing material from electroless plating waste by magnetic separation with HTS bulk magnet

    Energy Technology Data Exchange (ETDEWEB)

    Oka, T., E-mail: okat@eng.niigata-u.ac.jp [Niigata University, 8050 Ikarashi-Ninocho, Nishi-ku, Niigata 950-2181 (Japan); Fukazawa, H.; Fukui, S.; Ogawa, J.; Sato, T.; Ooizumi, M. [Niigata University, 8050 Ikarashi-Ninocho, Nishi-ku, Niigata 950-2181 (Japan); Tsujimura, M. [Aichi Giken Co., 50-1 Takeshita, Hitotugi-cho, Kariya, Aichi 448-0003 (Japan); Yokoyama, K. [Ashikaga Institute of Technology, 268-1 Ohmae-cho, Ashikaga, Tochigi 326-8558 (Japan)

    2014-01-15

    Highlights: ► The magnetic separation for Ni compounds was conducted by HTS bulk magnet. ► The coarse Ni-sulfate crystals were formed from the Ni-phosphite precipitates. ► Ni-sulfate crystals was separated from the mixture of Ni-sulfate and Ni-phosphite compounds. -- Abstract: The magnetic separation experiment to collect the Ni compounds from the waste liquid of electroless plating processes was conducted in the open-gradient magnetic separation process with the high temperature superconducting bulk magnet system. The magnetic pole containing Gd-based bulk superconductors was activated to 3.45 T at 35 K in the static magnetic field of 5 T with use of a superconducting solenoid magnet. The coarse Ni-sulfate crystals were formed by adding the concentrated sulfuric acid to the Ni-phosphite precipitates which yielded from the plating waste liquid by controlling the temperature and the pH value. The open-gradient magnetic separation technique was employed to separate the Ni-sulfate crystals from the mixture of the Ni-sulfate and Ni-phosphite compounds by the difference between their magnetic properties. And we succeeded in collecting Ni-sulfate crystals preferentially to the Ni-phosphite by attracting them to the magnetic pole soon after the Ni-sulfate crystals began to grow.

  12. Magnetic separation studies on ferruginous chromite fine to enhance Cr:Fe ratio

    Institute of Scientific and Technical Information of China (English)

    Sunil Kumar Tripathy; PK Banerjee; Nikkam Suresh

    2015-01-01

    The Cr:Fe ratio (chromium-to-iron mass ratio) of chromite affects the production of chrome-based ferroalloys. Although the lit-erature contains numerous reports related to the magnetic separation of different minerals, limited work concerning the application of mag-netic separation to fine chromite from the Sukinda region of India to enhance its Cr:Fe ratio has been reported. In the present investigation, magnetic separation and mineralogical characterization studies of chromite fines were conducted to enhance the Cr:Fe ratio. Characterization studies included particle size and chemical analyses, X-ray diffraction analysis, automated mineral analysis, sink-and-float studies, and mag-netic susceptibility measurements, whereas magnetic separation was investigated using a rare earth drum magnetic separator, a rare earth roll magnetic separator, an induced roll magnetic separator, and a wet high-intensity magnetic separator. The fine chromite was observed to be upgraded to a Cr:Fe ratio of 2.2 with a yield of 55.7%through the use of an induced roll magnetic separator and a feed material with a Cr:Fe ratio of 1.6.

  13. The study on the magnetic filter using the rotation of permanent magnets for separation of radioactive corrosion products

    International Nuclear Information System (INIS)

    Most of the insoluble radioactive corrosion products have the characteristic of showing strong ferrimagnetism. Along with the new development and production of permanent magnets which generate much stronger magnetic field than conventional permanent magnets, new type of magnetic filter that can separate radioactive corrosion products efficiently and eventually reduce the radiation exposure of the personnel at a nuclear power plant is suggested. This new type of separator with novel geometry consists of an inner and an outer magnet assembly, a coolant channel and a container surrounding the outer magnet assembly. The particulates are separated from the coolant by the alternating magnetic fields that are generated by shift arrangement of permanent magnets. This study describes of experimental results performed with the different flow rates, rotation velocities of magnet assemblies, particle size and various materials. The efficiency of magnetic filter tends to increase as the flow rate is lower, and particle size is bigger. The rotating velocity of magnet assembly has also some influences on the separation efficiency. This new magnetic filter shows good performance results in filtering magnetite, cobalt ferrite and nickel ferrite except hematite, which is a kind of anti-ferromagnetic material, from aqueous coolant simulation. At the above 5 μm of particle size, the separation efficiencies are over than 90%. (author)

  14. Magnetic separation studies for a low grade siliceous iron ore sample

    Institute of Scientific and Technical Information of China (English)

    Dwari Ranjan Kumar; Rao Danda Srinivas; Reddy Palli Sita Ram

    2013-01-01

    Investigations were carried out,on a low grade siliceous iron ore sample by magnetic separation,to establish its amenability for physical beneficiation.Mineralogical studies revealed that the sample consists of magnetite,hematite and goethite as major opaque oxide minerals where as silicates as well as carbonates form the gangue minerals in the sample.Processes involving combination of classification,dry magnetic separation and wet magnetic separation were carried out to upgrade the low grade siliceous iron ore sample to make it suitable as a marketable product.The sample was first ground and each closed size sieve fractions were subjected to dry magnetic separation and it was observed that limited upgradation is possible.The ground sample was subjected to different finer sizes and separated by wet low intensity magnetic separator.It was possible to obtain a magnetic concentrate of 67% Fe by recovering 90% of iron values at below 200 μm size.

  15. SUPERCONDUCTING MAGNET FOR 60 TONNE/HOUR MINERAL SEPARATOR WITH CLOSED CYCLE 4 KELVIN REFRIGERATION

    OpenAIRE

    Good, J.; White, K.

    1984-01-01

    Cryogenic Consultants Limited has constructed a superconducting magnet system for magnetic separation, with a three metre long dipole magnet cooled by a closed-cycle refrigerator. This paper considers the design and construction of the magnet system in relation to a theoretical expression for processing capacity.

  16. The Effect of Pretreatment on Magnetic Separation of Ferruginous Minerals in Bauxite

    OpenAIRE

    Rao, R. Bhima; Besra, L.; Reddy, B. R.; Banerjee, G. N.

    1997-01-01

    Bauxite sample of Jamnagar, India, is suitable for refractory applications after separation of iron minerals. Different magnetic separators and intensities are studied on different treated samples. The results of these investigations indicate that removal of ferruginous minerals from crude sample requires a magnetic intensity of 14 000 Gauss. The calcined sample at 800℃ requires magnetic intensity of about 7000 Gauss, whereas the reduced bauxite needs less than 2000 Gauss for separation of ir...

  17. Large Scale Magnetic Separation of Solanum tuberosum Tuber Lectin from Potato Starch Waste Water

    Science.gov (United States)

    Safarik, Ivo; Horska, Katerina; Martinez, Lluis M.; Safarikova, Mirka

    2010-12-01

    A simple procedure for large scale isolation of Solanum tuberosum tuber lectin from potato starch industry waste water has been developed. The procedure employed magnetic chitosan microparticles as an affinity adsorbent. Magnetic separation was performed in a flow-through magnetic separation system. The adsorbed lectin was eluted with glycine/HCl buffer, pH 2.2. The specific activity of separated lectin increased approximately 27 times during the isolation process.

  18. Magnetic separation of particles and cells in ferrofluid flow through a straight microchannel using two offset magnets

    Energy Technology Data Exchange (ETDEWEB)

    Zeng, Jian; Deng, Yanxiang [Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921 (United States); Vedantam, Pallavi; Tzeng, Tzuen-Rong [Department of Biological Sciences, Clemson University, Clemson, SC 29634-0314 (United States); Xuan, Xiangchun, E-mail: xcxuan@clemson.edu [Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921 (United States)

    2013-11-15

    The separation of particles and cells is critical in many chemical and biological applications. This work presents a simple idea for utilizing a pair of permanent magnets to continuously separate diamagnetic particles and cells in ferrofluid flow through a straight microchannel. The first magnet is placed close to the microchannel for focusing the particle mixture to a single stream without the use of a sheath flow. The second magnet, which is offset from the first magnet and placed farther from the channel, is to displace the aligned particles to dissimilar flow paths for a continuous sorting. This idea is first demonstrated through the separation of 3 μm- and 10 μm-diameter polystyrene particles, where the effects of flow speed and magnet distance are both examined. The experimental data are found to fit well with the predictions of an analytical model. Furthermore, a continuous separation of live yeast cells from 10 μm polystyrene particles is implemented in the same device. - Highlights: • We develop a simple diamagnetic particle and cell separation technique in ferrofluids. • Two offset magnets are used to achieve a sheath-free continuous separation in a straight microchannel. • The technique is demonstrated through the magnetic separation of polystyrene particles and yeast cells. • The effects of ferrofluid speed and magnet-channel distance are examined on particle separation. • The predictions from an analytical model agree with the experimental data quantitatively.

  19. SUPERCONDUCTING OPEN-GRADIENT MAGNETIC SEPARATION FOR THE PRETREATMENT OF RADIOACTIVE OR MIXED WASTE VITRIFICATION FEEDS

    Science.gov (United States)

    Scientists need to gain a better understanding of the magnetic separation processes that can be used to separate deleterious constituents (crystalline, amorphous, and colloidal) in vitrification feed streams for borosilicate glass production without adding chemicals or generating...

  20. Continuous sheath-free magnetic separation of particles in a U-shaped microchannel

    OpenAIRE

    Liang, Litao; Xuan, Xiangchun

    2012-01-01

    Particle separation is important to many chemical and biomedical applications. Magnetic field-induced particle separation is simple, cheap, and free of fluid heating issues that accompany electric, acoustic, and optical methods. We develop herein a novel microfluidic approach to continuous sheath-free magnetic separation of particles. This approach exploits the negative or positive magnetophoretic deflection to focus and separate particles in the two branches of a U-shaped microchannel, respe...

  1. Conjugates of Actinide Chelator-Magnetic Nanoparticles for Used Fuel Separation Technology

    Energy Technology Data Exchange (ETDEWEB)

    Qiang, You; Paszczynski, Andrzej; Rao, Linfeng

    2011-10-30

    The actinide separation method using magnetic nanoparticles (MNPs) functionalized with actinide specific chelators utilizes the separation capability of ligand and the ease of magnetic separation. This separation method eliminated the need of large quantity organic solutions used in the liquid-liquid extraction process. The MNPs could also be recycled for repeated separation, thus this separation method greatly reduces the generation of secondary waste compared to traditional liquid extraction technology. The high diffusivity of MNPs and the large surface area also facilitate high efficiency of actinide sorption by the ligands. This method could help in solving the nuclear waste remediation problem.

  2. Coupled particle-fluid transport and magnetic separation in microfluidic systems with passive magnetic functionality

    Science.gov (United States)

    Khashan, Saud A.; Furlani, Edward P.

    2013-03-01

    A study is presented of coupled particle-fluid transport and field-directed particle capture in microfluidic systems with passive magnetic functionality. These systems consist of a microfluidic flow cell on a substrate that contains embedded magnetic elements. Two systems are considered that utilize soft- and hard-magnetic elements, respectively. In the former, an external field is applied to magnetize the elements, and in the latter, they are permanently magnetized. The field produced by the magnetized elements permeates into the flow cell giving rise to an attractive force on magnetic particles that flow through it. The systems are studied using a novel numerical/closed-form modelling approach that combines numerical transport analysis with closed-form field analysis. Particle-fluid transport is computed using computational fluid dynamics (CFD), while the magnetic force that governs particle capture is obtained in closed form. The CFD analysis takes into account dominant particle forces and two-way momentum transfer between the particles and the fluid. The two-way particle-fluid coupling capability is an important feature of the model that distinguishes it from more commonly used and simplified one-way coupling analysis. The model is used to quantify the impact of two-way particle-fluid coupling on both the capture efficiency and the flow pattern in the systems considered. Many effects such as particle-induced flow-enhanced capture efficiency and flow circulation are studied that cannot be predicted using one-way coupling analysis. In addition, dilute particle dispersions are shown to exhibit significant localized particle-fluid coupling near the capture regions, which contradicts the commonly held view that two-way coupling can be ignored when analysing high-gradient magnetic separation involving such particle systems. Overall, the model demonstrates that two-way coupling needs to be taken into account for rigorous predictions of capture efficiency, especially

  3. Magnetic separation in microfluidic systems using microfabricated electromagnets - Experiments and simulations

    DEFF Research Database (Denmark)

    Smistrup, Kristian; Hansen, Ole; Bruus, Henrik;

    2005-01-01

    We present experiments and simulations of magnetic separation of magnetic beads in a microfluidic channel. The separation is obtained by microfabricated electromagnets. The results of our simulations using FEMLAB and Mathematica are compared with experimental results obtained using our own microf...... microfabricated systems. (c) 2005 Elsevier B.V. All rights reserved....

  4. An overview of separation by magnetically stabilized beds: State-of-the-art and potential applications

    Institute of Scientific and Technical Information of China (English)

    Jordan; Hristov; Ludmil; Fachikov

    2007-01-01

    This article deals with problems relevant to implementation of magnetically stabilized beds (MSB) as separation devices. The main issues discussed are: bed mechanics, bed structure, possibilities to create controllable filter media, etc. As examples several separation techniques are discussed: dust filtration-magnetic and non-magnetic, ion-exchange, copper cementation, yeast filtration from biological liquids, particle separation by density and magnetic properties, dangerous wastes removal. Only key publications will be quoted that provide a basis for further reading and study and relevant information.

  5. Development and Applications of a Drum Medium–Intensity Permanent Magnetic Separator

    OpenAIRE

    Liang, Cao Zhi

    1996-01-01

    This paper describes the development and testing of a drum medium—intensity permanent magnetic separator. The magnetic field strength on the drum surface can be increased to 0.8 T using a new magnet technology. Uniform distribution of a feed can be achieved with a two—stage feed system. Industrial tests were carried out using a manganese mineral from DouLan manganese mine. The results obtained show that good separation results can be obtained using the separator, with upper limit of the separ...

  6. HIGH-GRADIENT MAGNETIC SEPARATION FOR REMOVAL OF SULFUR FROM COAL

    Science.gov (United States)

    The report gives results of a thorough physical, chemical, and magnetic characterization of a Pennsylvania coal from the Upper Freeport seam. The powdered coal was then subjected to high-gradient magnetic separations, as a function of magnetic field and fluid velocity, in both a ...

  7. Magnetite/CdTe magnetic-fluorescent composite nanosystem for magnetic separation and bio-imaging

    Energy Technology Data Exchange (ETDEWEB)

    Kale, Anup; Yadav, Prasad; Gholap, Haribhau; Jog, J P; Ogale, Satishchandra [National Chemical Laboratory, Council of Scientific and Industrial Research, Pune 411008 (India); Kale, Sonia; Shastry, Padma [National Centre for Cell Science, Ganeshkhind, Pune 411007 (India); Pasricha, Renu [National Physical Laboratory, Council of Scientific and Industrial Research, New Delhi 110012 (India); Lefez, Benoit; Hannoyer, Beatrice, E-mail: padma@nccs.res.in, E-mail: satishogale@gmail.com [Universite de Rouen, GPM UMR 6634 CNRS-BP 12, 76801 Etienne du Rouvray Cedex (France)

    2011-06-03

    A new synthesis protocol is described to obtain a CdTe decorated magnetite bifunctional nanosystem via dodecylamine (DDA) as cross linker. High resolution transmission electron microscopy (HRTEM), energy-dispersive x-ray spectroscopy (EDAX), vibrating sample magnetometry (VSM), Fourier transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS) and fluorescence microscopy are used to characterize the constitution, size, composition and physical properties of these superparamagnetic-fluorescent nanoparticles. These CdTe decorated magnetite nanoparticles were then functionalized with anti-epidermal growth factor receptor (EGFR) antibody to specifically target cells expressing this receptor. The EGFR is a transmembrane glycoprotein and is expressed on tumor cells from different tissue origins including human leukemic cell line Molt-4 cells. The magnetite-CdTe composite nanosystem is shown to perform excellently for specific selection, magnetic separation and fluorescent detection of EGFR positive Molt-4 cells from a mixed population. Flow cytometry and confocal laser scanning microscopy results show that this composite nanosystem has great potential in antibody functionalized magnetic separation and imaging of cells using cell surface receptor antibody.

  8. Development of volume reduction method of cesium contaminated soil with magnetic separation

    Energy Technology Data Exchange (ETDEWEB)

    Yukumatsu, Kazuki; Nomura, Naoki; Mishima, Fumihito; Akiyama, Yoko; Nishijima, Shigehiro [Osaka University, Osaka (Japan)

    2016-03-15

    In this study, we developed a new volume reduction technique for cesium contaminated soil by magnetic separation. Cs in soil is mainly adsorbed on clay which is the smallest particle constituent in the soil, especially on paramagnetic 2:1 type clay minerals which strongly adsorb and fix Cs. Thus selective separation of 2:1 type clay with a superconducting magnet could enable to reduce the volume of Cs contaminated soil. The 2:1 type clay particles exist in various particle sizes in the soil, which leads that magnetic force and Cs adsorption quantity depend on their particle size. Accordingly, we examined magnetic separation conditions for efficient separation of 2:1 type clay considering their particle size distribution. First, the separation rate of 2:1 type clay for each particle size was calculated by particle trajectory simulation, because magnetic separation rate largely depends on the objective size. According to the calculation, 73 and 89 % of 2:1 type clay could be separated at 2 and 7 T, respectively. Moreover we calculated dose reduction rate on the basis of the result of particle trajectory simulation. It was indicated that 17 and 51 % of dose reduction would be possible at 2 and 7 T, respectively. The difference of dose reduction rate at 2 T and 7 T was found to be separated a fine particle. It was shown that magnetic separation considering particle size distribution would contribute to the volume reduction of contaminated soil.

  9. G-mode magnetic force microscopy: Separating magnetic and electrostatic interactions using big data analytics

    Science.gov (United States)

    Collins, Liam; Belianinov, Alex; Proksch, Roger; Zuo, Tingting; Zhang, Yong; Liaw, Peter K.; Kalinin, Sergei V.; Jesse, Stephen

    2016-05-01

    In this work, we develop a full information capture approach for Magnetic Force Microscopy (MFM), referred to as generalized mode (G-Mode) MFM. G-Mode MFM acquires and stores the full data stream from the photodetector, captured at sampling rates approaching the intrinsic photodiode limit. The data can be subsequently compressed, denoised, and analyzed, without information loss. Here, G-Mode MFM is implemented and compared to the traditional heterodyne-based MFM on model systems, including domain structures in ferromagnetic Yttrium Iron Garnet and the electronically and magnetically inhomogeneous high entropy alloy, CoFeMnNiSn. We investigate the use of information theory to mine the G-Mode MFM data and demonstrate its usefulness for extracting information which may be hidden in traditional MFM modes, including signatures of nonlinearities and mode-coupling phenomena. Finally, we demonstrate detection and separation of magnetic and electrostatic tip-sample interactions from a single G-Mode image, by analyzing the entire frequency response of the cantilever. G-Mode MFM is immediately implementable on any atomic force microscopy platform and as such is expected to be a useful technique for probing spatiotemporal cantilever dynamics and mapping material properties, as well as their mutual interactions.

  10. Purification of condenser water in thermal power station by superconducting magnetic separation

    International Nuclear Information System (INIS)

    Magnetic separation using cryo-cooled Nb-Ti superconducting magnet was applied for the purification of condenser water. Iron oxides in condenser water were effectively removed by superconducting magnetic separation. The effect of magnetic field strength and filter size was determined. Thermal power station is made up of a steam turbine and a steam condenser which need a lot of water. The water of steam condenser should be replaced, since scales consisting of iron oxide mainly are accumulated on the surface of condenser pipes as it goes. Superconducting high gradient magnetic separation (HGMS) system has merits to remove paramagnetic substance like iron oxides because it can generate higher magnetic field strength than electromagnet or permanent magnet. In this paper, cryo-cooled Nb-Ti superconducting magnet that can generate up to 6 T was used for HGMS systems. Magnetic filters were designed by the analysis of magnetic field distribution at superconducting magnets. The result of X-ray analysis showed contaminants were mostly α-Fe2O3 (hematite) and γ-Fe2O3 (maghemite). The higher magnetic field was applied up to 6 T, the more iron oxides were removed. As the wire diameter of magnetic filter decreased, the turbidity removal of the sample was enhanced.

  11. Purification of condenser water in thermal power station by superconducting magnetic separation

    Energy Technology Data Exchange (ETDEWEB)

    Ha, D.W., E-mail: dwha@keri.re.kr [Korea Electrotechnology Research Institute, Changwon 642-120 (Korea, Republic of); Kwon, J.M.; Baik, S.K.; Lee, Y.J. [Korea Electrotechnology Research Institute, Changwon 642-120 (Korea, Republic of); Han, K.S. [Korea South-East Power Co., Goseong 638-932 (Korea, Republic of); Ko, R.K.; Sohn, M.H.; Seong, K.C. [Korea Electrotechnology Research Institute, Changwon 642-120 (Korea, Republic of)

    2011-11-15

    Magnetic separation using cryo-cooled Nb-Ti superconducting magnet was applied for the purification of condenser water. Iron oxides in condenser water were effectively removed by superconducting magnetic separation. The effect of magnetic field strength and filter size was determined. Thermal power station is made up of a steam turbine and a steam condenser which need a lot of water. The water of steam condenser should be replaced, since scales consisting of iron oxide mainly are accumulated on the surface of condenser pipes as it goes. Superconducting high gradient magnetic separation (HGMS) system has merits to remove paramagnetic substance like iron oxides because it can generate higher magnetic field strength than electromagnet or permanent magnet. In this paper, cryo-cooled Nb-Ti superconducting magnet that can generate up to 6 T was used for HGMS systems. Magnetic filters were designed by the analysis of magnetic field distribution at superconducting magnets. The result of X-ray analysis showed contaminants were mostly {alpha}-Fe{sub 2}O{sub 3} (hematite) and {gamma}-Fe{sub 2}O{sub 3} (maghemite). The higher magnetic field was applied up to 6 T, the more iron oxides were removed. As the wire diameter of magnetic filter decreased, the turbidity removal of the sample was enhanced.

  12. Theoretical Principles, Present Status and Prospects for Development of Material Separation in Magnetic Fluids

    OpenAIRE

    Gubarevich, V. N.; Vidsota, S. V.

    1994-01-01

    This paper reviews theoretical principles of material separation in magnetic fluids according to their density. The main formulae and expressions are summarised and possible prospects for development of this relatively young branch of separation are indicated. Specifications are given for separators of this type, as designed over the last several years by the Lugansk Institute "Gipromashugleobogaschchenie". Practical experience obtained in the Institute is outlined.

  13. Characterization of the physical parameters in a process of magnetic separation and pressure-driven flow of a magnetic fluid

    Science.gov (United States)

    Cunha, F. R.; Sobral, Y. D.

    2004-11-01

    The equations governing the motion of a magnetic fluid are presented. These equations are non-linear and give rise to non-Newtonian effects attributable to the magnetization of the fluid. The equations are made dimensionless and the physical parameters of the coupled hydrodynamic-magnetic problem identified. The study is first applied to describe the motion of a magnetic droplet freely suspended in a viscous fluid undergoing a permanent magnetic field. A first-order theory is developed for the regime of small drop deformation in which viscous forces dominate inertial hydrodynamic force. At this regime, it is shown that the drift velocity of a magnetic drop scales with the square of the applied magnetic field and the deformation of the drop scales linearly with the applied field. Experiments are carried out and the range of validity of the small deformation analysis determined. The pressure-driven flow of a magnetic fluid is solved by a regular asymptotic expansion for two cases: a Poiseuille flow of a single magnetic fluid and a core pipe flow with a magnetic fluid adjacent to the tube wall. The theory is used to predict the volume rate of a viscous magnetic fluid separated from a non-magnetic viscous fluid by the action of a magnetic field. The apparent viscosity of a magnetic fluid as a function of magnetic parameters is also examined from our theory. A possible application of the present theoretical studies is on the remediation technology addressed to oil spills in natural environments.

  14. Magnetic separation of algae genetically modified for increased intracellular iron uptake

    Energy Technology Data Exchange (ETDEWEB)

    Buck, Amy [Case Western Reserve University, Cleveland, OH (United States); Cleveland Clinic, Cleveland, OH (United States); Moore, Lee R. [Cleveland Clinic, Cleveland, OH (United States); Lane, Christopher D.; Kumar, Anil; Stroff, Clayton; White, Nicolas [Phycal Inc., Cleveland, OH (United States); Xue, Wei; Chalmers, Jeffrey J. [The Ohio State University, Columbus, OH (United States); Zborowski, Maciej, E-mail: zborowm@ccf.org [Cleveland Clinic, Cleveland, OH (United States)

    2015-04-15

    Algae were investigated in the past as a potential source of biofuel and other useful chemical derivatives. Magnetic separation of algae by iron oxide nanoparticle binding to cells has been proposed by others for dewatering of cellular mass prior to lipid extraction. We have investigated feasibility of magnetic separation based on the presence of natural iron stores in the cell, such as the ferritin in Auxenochlorella protothecoides (A. protothecoides) strains. The A. protothecoides cell constructs were tested for inserted genes and for increased intracellular iron concentration by inductively coupled plasma atomic absorption (ICP–AA). They were grown in Sueoka’s modified high salt media with added vitamin B1 and increasing concentration of soluble iron compound (FeCl{sub 3} EDTA, from 1× to 8× compared to baseline). The cell magnetic separation conditions were tested using a thin rectangular flow channel pressed against interpolar gaps of a permanent magnet forming a separation system of a well-defined fluid flow and magnetic fringing field geometry (up to 2.2 T and 1000 T/m) dubbed “magnetic deposition microscopy”, or MDM. The presence of magnetic cells in suspension was detected by formation of characteristic deposition bands at the edges of the magnet interpolar gaps, amenable to optical scanning and microscopic examination. The results demonstrated increasing cellular Fe uptake with increasing Fe concentration in the culture media in wild type strain and in selected genetically-modified constructs, leading to magnetic separation without magnetic particle binding. The throughput in this study is not sufficient for an economical scale harvest. - Highlights: • Auxenochlorella protothecoides algae were genetically modified for biofuel production. • Algal iron metabolism was sufficient for their label-less magnetic separation. • High magnetic field and low flow required make the separation scale-up uneconomical.

  15. Magnetic separation of algae genetically modified for increased intracellular iron uptake

    International Nuclear Information System (INIS)

    Algae were investigated in the past as a potential source of biofuel and other useful chemical derivatives. Magnetic separation of algae by iron oxide nanoparticle binding to cells has been proposed by others for dewatering of cellular mass prior to lipid extraction. We have investigated feasibility of magnetic separation based on the presence of natural iron stores in the cell, such as the ferritin in Auxenochlorella protothecoides (A. protothecoides) strains. The A. protothecoides cell constructs were tested for inserted genes and for increased intracellular iron concentration by inductively coupled plasma atomic absorption (ICP–AA). They were grown in Sueoka’s modified high salt media with added vitamin B1 and increasing concentration of soluble iron compound (FeCl3 EDTA, from 1× to 8× compared to baseline). The cell magnetic separation conditions were tested using a thin rectangular flow channel pressed against interpolar gaps of a permanent magnet forming a separation system of a well-defined fluid flow and magnetic fringing field geometry (up to 2.2 T and 1000 T/m) dubbed “magnetic deposition microscopy”, or MDM. The presence of magnetic cells in suspension was detected by formation of characteristic deposition bands at the edges of the magnet interpolar gaps, amenable to optical scanning and microscopic examination. The results demonstrated increasing cellular Fe uptake with increasing Fe concentration in the culture media in wild type strain and in selected genetically-modified constructs, leading to magnetic separation without magnetic particle binding. The throughput in this study is not sufficient for an economical scale harvest. - Highlights: • Auxenochlorella protothecoides algae were genetically modified for biofuel production. • Algal iron metabolism was sufficient for their label-less magnetic separation. • High magnetic field and low flow required make the separation scale-up uneconomical

  16. In search of chiral magnetic effect: separating flow-driven background effects and quantifying anomaly-induced charge separations

    CERN Document Server

    Huang, Xu-Guang; Liao, Jinfeng

    2015-01-01

    We report our recent progress on the search of Chiral Magnetic Effect (CME) by developing new measurements as well as by hydrodynamic simulations of CME and background effects, with both approaches addressing the pressing issue of separating flow-driven background contributions and possible CME signal in current heavy ion collision measurements.

  17. Chiral magnetic microspheres purified by centrifugal field flow fractionation and microspheres magnetic chiral chromatography for benzoin racemate separation

    OpenAIRE

    Tian, Ailin; Qi, Jing; Liu, Yating; Wang, Fengkang; Ito, Yoichiro; Wei, Yun

    2013-01-01

    Separation of enantiomers still remains a challenge due to their identical physical and chemical properties in a chiral environment, and the research on specific chiral selector along with separation techniques continues to be conducted to resolve individual enantiomers. In our laboratory the promising magnetic chiral microspheres Fe3O4@SiO2@cellulose-2, 3-bis (3, 5-dimethylphenylcarbamate) have been developed to facilitate the resolution using both its magnetic property and chiral recognitio...

  18. On-chip magnetic separation of superparamagnetic beads for integrated molecular analysis

    OpenAIRE

    Florescu, Octavian; Wang, Kevan; Au, Patrick; Tang, Jimmy; Harris, Eva; Beatty, P. Robert; Boser, Bernhard E.

    2010-01-01

    We have demonstrated a postprocessed complementary metal oxide semiconductor (CMOS) integrated circuit (IC) capable of on-chip magnetic separation, i.e., removing via magnetic forces the nonspecifically bound magnetic beads from the detection area on the surface of the chip. Initially, 4.5 μm wide superparamagnetic beads sedimenting out of solution due to gravity were attracted to the detection area by a magnetic concentration force generated by flowing current through a conductor embedded in...

  19. Fluctuations of the Solitary Bubble at the Separation from the Air Cavity, Compressed by the Magnetic Field in Magnetic Liquid

    OpenAIRE

    M.L. Boev; Polunin, V.M.; O.V. Lobova; Shabanova, I.A.; L.M. Chervjakov; A.N. Ryapolov

    2013-01-01

    In the article, on the basis of the concept of "display" of geometry of a free surface of the "low-magnetic" environment by the topography of isolines of the module of intensity of a magnetic field, it is studied a form of a free surface of magnetic fluid in a static condition at the initial stage of rapprochement of a ring magnet with a surface of a column of magnetic fluid in a tube and at a stage of pressing of a cavity to a bottom. It is shown that the separation of bubbles from an air ca...

  20. Cleaning of liquid radioactive waste by the methods of ozonization and magnetic separation

    International Nuclear Information System (INIS)

    The possibility for purification of liquid radioactive wastes (LRW) from organic compounds by the methods of ozonization and magnetic separation is studied. It is shown that addition of a finely divided ferromagnetic substance into LRW and subsequent filtration through a magnetic filter is an effective method for removal of emulsified organic compounds. The dissolved organic compounds are destroyed by ozonization. Some characteristics of the ozonization and magnetic separation processes are determined. The composition of the products of reactions between ozone and organic compounds is defined. The behavior of 137Cs in the process of magnetic separation is investigated. A feasibility of very good cleaning of LRW from emulsified organic compounds by means of successive application of the methods of magnetic separation and ozonization is confirmed

  1. Integrated acoustic and magnetic separation in microfluidic channels

    DEFF Research Database (Denmark)

    Adams, Jonathan; Thevoz, Patrick; Bruus, Henrik;

    2009-01-01

    With a growing number of cell-based biotechnological applications, there is a need for particle separation systems capable of multiparameter separations at high purity and throughput, beyond what is presently offered by traditional methods including fluorescence activated cell sorting and column-......(8) particles/hr. (C) 2009 American Institute of Physics. [doi:10.1063/1.3275577]...

  2. Treatment of Red Mud From Alumina Production by High–Intensity Magnetic Separation

    OpenAIRE

    Fofana, Mohamad; Kmet, Stanislav; Jakabský, Štefan; Hredzák, Slavomír; Kunhalmi, Gabriel

    1995-01-01

    The paper gives attention to the possibilities of magnetic separation of red mud. The red mud can be characterised as an insoluble residue originated during the bayer method application in bauxite processing. Sample of red mud was obtained by leaching of bauxite from the Fria deposit (Guinea). The wet method of high–intensity magnetic separation was applied to the treatment. The magnetic product with the Fe content of 47% and recovery of 85% was obtained under magnetic field induction of 0.06...

  3. Magnetically Separable Fe3O4@DOPA-Pd: A Heterogeneous Catalyst for Aqueous Heck Reaction

    Science.gov (United States)

    Magnetically separable Fe3O4@DOPA-Pd catalyst has been synthesized via anchoring of palladium over dopamine-coated magnetite via non-covalent interaction and the catalyst is utilized for expeditious Heck coupling in aqueous media.

  4. Synthesis of TBP-coated magnetic Pst-DVB particles for uranium separation

    International Nuclear Information System (INIS)

    Magnetically assisted chemical separation process is an efficient method used widely in separating radionuclides and heavy metals in environmental samples. It is simple, compact and cost-effective, with less secondary waste streams. Tributyl phosphate (TBP)-coated magnetic poly (styrene-divinylbenzene) (Pst-DVB) nano-particles were synthesized and characterized by transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometer, thermogravimetry and Fourier transform infrared spectrometry. The application of TBP-coated magnetic Pst-DVB particles in separating low concentration of uranium from aqueous media was evaluated, and the equilibrium adsorption isotherm was investigated. Our results indicate that the TBP-coated magnetic Pst-DVB particles may be of potential application for uranium separation. (authors)

  5. Magnetically separable Fe3O4@DOPA–Pd: a heterogeneous catalyst for aqueous Heck reaction

    Data.gov (United States)

    U.S. Environmental Protection Agency — Magnetically separable Fe3O4@DOPA–Pd catalyst has been synthesized via anchoring of palladium over dopamine-coated magnetite via co-ordinate interaction and the...

  6. The use of magnetic isotope effect for the separation of uranium isotopes

    International Nuclear Information System (INIS)

    The influence of the magnetic isotope effect on the reaction of radical pairs containing radical-ion UO22+, is investigated. This can be further used in the new method of uranium isotope separation in chemical reaction

  7. Recovering limonite from Australia iron ores by flocculation-high intensity magnetic separation

    Institute of Scientific and Technical Information of China (English)

    LUO Li-qun; ZHANG Jing-sheng; YU Yong-fu

    2005-01-01

    Successful recovery of limonite from iron fines was achieved by using flocculation-high intensity magnetic separation (FIMS) and adding hydrolyzed and causticized flocculants according to the characteristic of iron fines. The separation results of the three iron samples are as follows: iron grade 66.77%-67.98% and the recovery of iron 69.26%-70.70% by the FIMS process with flocculants. The comparative results show that under the same separation conditions the FIMS process can effectively increase the recovery of iron by 10.97%-15.73%. The flowsheet results confirm the reliability of the process in a SHP high intensity magnetic separator. The concentrate product can be used as raw materials for direct reduction iron-smelting. The hydrolyzed and causticized flocculants can selectively flocculate fine feebly-magnetic iron mineral particles to increase their apparent separation sizes. The larger the separation size, the stronger the magnetic force. By comparing the separation results of the three samples it is found that among the three samples the higher the limonite content, the better the separation result. This means that the separation result relates closely to the flocculation process and the adding pattern of the flocculant.

  8. Application of Permanent Dry High Intensity Magnetic Separation for the Processing of Spent FCC Catalyst

    OpenAIRE

    Leaper, M. C.; Kingman, S. W.; Seville, J. P. K.

    2002-01-01

    This paper discusses the application of permanent dry high intensity magnetic separation to improve the efficiency of Fluidised Catalytic Cracking (FCC) systems used in oil refining, causing preferential removal of deactivated (spent) catalyst from the process. It was shown that this technique can provide efficient separation of spent catalyst from fresh, despite some loss of fine particles. The effects of particle segregation were also investigated, with both magnetic and nonmagnetic particl...

  9. Closed-loop magnetic separation of nanoparticles on a packed bed of spheres

    OpenAIRE

    Magnet, Cécilia; Akouala, Mesferdon; Kuzhir, Pavel; Bossis, Georges; Zubarev, A; Wereley, Norman

    2015-01-01

    International audience In this work, we consider magnetic separation of iron oxide nanoparticles when a nanoparticle suspension (diluted ferrofluid) passes through a closed-loop filter composed of a packed bed of micro-beads magnetized by an externally applied magnetic field. We show that the capture of nanoparticles of a size as small as 60 nm is easily achieved at low-to-moderate magnetic fields (15 kA/m) thanks to relatively strong magnetic interactions between them. The key parameter g...

  10. Characteristics of the magnetic control of separable ferrous impurities contained in raw construction materials

    Directory of Open Access Journals (Sweden)

    A.V. Sandulyak

    2013-04-01

    Full Text Available Currency of using the method of magnetic control of ferrous impurities for construction materials was noted. Especially it is important because of magnetic separators which are widely used for elimination of these impurities. There were shown the necessity of upgrading the present approach in order to realize the method of magnetic control. For example, it is necessary to take into account not only the rest of ferrous impurities (that is inevitable after limited numbers of operations but also a factor of involving sand particles. The concrete proposal how to develop the existing system of magnetic control of ferrous impurities in construction materials subjected to magnetic separation, is stated. The experimental-calculation model for such control is also shown. The main parameters of such model were estimated on the example of quartz sand and feldspar. The errors of standard methods of magnetic control were revealed for the first time.

  11. Fluctuations of the Solitary Bubble at the Separation from the Air Cavity, Compressed by the Magnetic Field in Magnetic Liquid

    Directory of Open Access Journals (Sweden)

    M.L. Boev

    2013-12-01

    Full Text Available In the article, on the basis of the concept of "display" of geometry of a free surface of the "low-magnetic" environment by the topography of isolines of the module of intensity of a magnetic field, it is studied a form of a free surface of magnetic fluid in a static condition at the initial stage of rapprochement of a ring magnet with a surface of a column of magnetic fluid in a tube and at a stage of pressing of a cavity to a bottom. It is shown that the separation of bubbles from an air cavity occurs in close proximity to the plane of symmetry of a ring magnet on its axis. It is described the method and experimental installation for studying the possibility of electromagnetic indication of sizes of the air bubbles, being in magnetic fluid. It is discussed the results of experimental research on process of a separation of solitary air bubble from a cavity, contained in magnetic fluid and squeezed by ponderomotive forces of a magnetic field which are of interest for creation of essentially new technique of the dosed supply of small amount of gas in the reactor.

  12. Magnetic mineral separation: a timeless challenge for an experimental rock magnetist

    Science.gov (United States)

    Lagroix, France; Guyodo, Yohan; Till, Jessica L.; Nova Naess, Live

    2014-05-01

    One timeless challenge in rock magnetic studies, inclusive of paleomagnetism and environmental magnetism, is decomposing a sample's bulk magnetic behaviour into its individual magnetic mineral components. One approach consists of physically separating the bulk into its components prior to magnetic characterization. Both dry magnetic based or wet magnetic or gravity based techniques are routinely used. A second approach consists of chemical separation where certain components may be preferentially dissolved. Component characterization is achieved by comparing before and after magnetic data. Both physical and chemical approaches have shortcomings biasing the separation towards a physical behavior which may encompass more than one mineral species. A third approach calls for numerical unmixing of magnetic data such as hysteresis loops and remanence (e.g. ARM, IRM) acquisition of demagnetization curves. Here the main drawback is that a priori knowledge of the expected behavior of each mineral component is required. When considering how dependent the magnetic behavior of a mineral is on, for example, grain size, stoichiometry, concentration (i.e. magnetic interactions); the a priori bases functions required become a significant limitation of numerical unmixing techniques. We present a method permitting to decompose the magnetic behavior of a bulk sample experimentally and at low temperature avoiding any ambiguities in data interpretation due to heating induced alteration. A single instrument is used to measure the temperature dependence of the remanent magnetization and to apply different steps of AF demagnetizations and thermal demagnetization. The experimental method is validated on synthetic mixtures of magnetite, hematite, goethite as well as on natural loess samples where the contributions of magnetite, goethite, hematite and maghemite are successfully isolated. The experimental protocol can be adapted to target other iron bearing minerals relevant to the rock or

  13. Quantitative characterization of magnetic separators: Comparison of systems with and without integrated microfluidic mixers

    DEFF Research Database (Denmark)

    Lund-Olesen, Torsten; Bruus, Henrik; Hansen, Mikkel Fougt

    2006-01-01

    We present two new types of microfluidic passive magnetic bead separator systems as well as methods for performing quantitative characterizations of them. Both systems consist of a microfluidic channel with long rectangular magnetic elements of permalloy that are placed by the sides of the channe...

  14. High-gradient magnetic affinity separation of trypsin from porcine pancreatin

    DEFF Research Database (Denmark)

    Hubbuch, Jürgen; Thomas, Owen R. T.

    2002-01-01

    We introduce a robust and scale-flexible approach to macromolecule purification employing tailor-made magnetic adsorbents and high-gradient magnetic separation technology adapted from the mineral processing industries. Detailed procedures for the synthesis of large quantities of low-cost defined ...

  15. A smart fully integrated micromachined separator with soft magnetic micro-pillar arrays for cell isolation

    Science.gov (United States)

    Dong, Tao; Su, Qianhua; Yang, Zhaochu; Zhang, Yulong; Egeland, Eirik B.; Gu, Dan D.; Calabrese, Paolo; Kapiris, Matteo J.; Karlsen, Frank; Minh, Nhut T.; Wang, K.; Jakobsen, Henrik

    2010-11-01

    A smart fully integrated micromachined separator with soft magnetic micro-pillar arrays has been developed and demonstrated, which can merely employ one independent lab-on-chip to realize cell isolation. The simulation, design, microfabrication and test for the new electromagnetic micro separator were executed. The simulation results of the electromagnetic field in the separator show that special soft magnetic micro-pillar arrays can amplify and redistribute the electromagnetic field generated by the micro-coils. The separator can be equipped with a strong magnetic field to isolate the target cells with a considerably low input current. The micro separator was fabricated by micro-processing technology. An electroplating bath was hired to deposit NiCo/NiFe to fabricate the micro-pillar arrays. An experimental system was set up to verify the function of the micro separator by isolating the lymphocytes, in which the human whole blood mixed with Dynabeads® FlowComp Flexi and monoclonal antibody MHCD2704 was used as the sample. The results show that the electromagnetic micro separator with an extremely low input current can recognize and capture the target lymphocytes with a high efficiency, the separation ratio reaching more than 90% at a lower flow rate. For the electromagnetic micro separator, there is no external magnetizing field required, and there is no extra cooling system because there is less Joule heat generated due to the lower current. The magnetic separator is totally reusable, and it can be used to separate cells or proteins with common antigens.

  16. A Model of Multiple Magnetic Separation in the Continuous Process

    OpenAIRE

    Brożek, M.

    1999-01-01

    In continuous enrichment processes, in industrial conditions and due to the generally required high efficiency of machines, a relatively high concentration of feed is applied. Since it is necessary to liberate the useful minerals, the feed has to be ground thoroughly and this fact results in the percentage growth of the fraction of particles measuring a few tens or several micrometers. When the particles are so fine and the feed is so much concentrated, the magnetic particles interactions pla...

  17. ELISA-like Analysis of Cisplatinated DNA Using Magnetic Separation

    OpenAIRE

    Kristyna Smerkova; Marcela Vlcnovska; Simona Dostalova; Vedran Milosavljevic; Pavel Kopel; Tomas Vaculovic; Sona Krizkova; Marketa Vaculovicova; Vojtech Adam; Rene Kizek

    2015-01-01

    Cisplatin belongs to the most widely used cytostatic drugs. The determination of the presence of the DNA-cisplatin adducts may not only signal the guanine-rich regions but also monitor the interaction reaction between DNA and the drug in terms of speed of interaction. In this work, the combined advantages of magnetic particles-based isolation/purification with fluorescent properties of quantum dots (QDs) and antibodies targeted on specific recognition of DNA-cisplatin adducts are demonstra...

  18. Fully integrated micro-separator with soft-magnetic micro-pillar arrays for filtrating lymphocytes.

    Science.gov (United States)

    Dong, Tao; Su, Qianhua; Yang, Zhaochu; Karlsen, Frank; Jakobsen, Henrik; Egeland, Eirik Bentzen; Hjelseth, Snorre

    2010-01-01

    A fully integrated micro-separator with soft-magnetic micro-pillar arrays has been developed, which merely employs one independent Lab-On-Chip to realize the lymphocytes isolation from the human whole blood. The simulation, fabrication and experiment are executed to realize this novel microseparator. The simulation results show that, the soft-magnetic micro-pillars array can amplify and redistribute the electromagnetic field generated by the microcoils. The tests certify desirable separation efficiency can be realized using this new separator at low current. No extra cooling system is required for such a micro-separator. This micro-separator can also be used to separate other target cells or particles with the same principle. PMID:21096497

  19. On-chip magnetic separation of superparamagnetic beads for integrated molecular analysis

    Science.gov (United States)

    Florescu, Octavian; Wang, Kevan; Au, Patrick; Tang, Jimmy; Harris, Eva; Beatty, P. Robert; Boser, Bernhard E.

    2010-03-01

    We have demonstrated a postprocessed complementary metal oxide semiconductor (CMOS) integrated circuit (IC) capable of on-chip magnetic separation, i.e., removing via magnetic forces the nonspecifically bound magnetic beads from the detection area on the surface of the chip. Initially, 4.5 μm wide superparamagnetic beads sedimenting out of solution due to gravity were attracted to the detection area by a magnetic concentration force generated by flowing current through a conductor embedded in the IC. After sedimentation, the magnetic beads that did not bind strongly to the functionalized surface of the IC through a specific biochemical complex were removed by a magnetic separation force generated by flowing current through another conductor placed laterally to the detection area. As the spherical bead pivoted on the surface of the chip, the lateral magnetic force was further amplified by mechanical leveraging, and 50 mA of current flowing through the separation conductor placed 18 μm away from the bead resulted in 7.5 pN of tensile force on the biomolecular tether immobilizing the bead. This force proved high enough to break nonspecific interactions while leaving specific antibody-antigen bonds intact. A sandwich capture immunoassay on purified human immunoglobulin G showed strong correlation with a control enzyme linked immunosorbent assay and a detection limit of 10 ng/ml or 70 pM. The beads bound to the detection area after on-chip magnetic separation were detected optically. To implement a fully integrated molecular diagnostics platform, the on-chip magnetic separation functionality presented in this work can be readily combine with state-of-the art CMOS-based magnetic bead detection technology.

  20. Magnetic separation of algae genetically modified for increased intracellular iron uptake

    Science.gov (United States)

    Buck, Amy; Moore, Lee R.; Lane, Christopher D.; Kumar, Anil; Stroff, Clayton; White, Nicolas; Xue, Wei; Chalmers, Jeffrey J.; Zborowski, Maciej

    2015-04-01

    Algae were investigated in the past as a potential source of biofuel and other useful chemical derivatives. Magnetic separation of algae by iron oxide nanoparticle binding to cells has been proposed by others for dewatering of cellular mass prior to lipid extraction. We have investigated feasibility of magnetic separation based on the presence of natural iron stores in the cell, such as the ferritin in Auxenochlorella protothecoides (A. protothecoides) strains. The A. protothecoides cell constructs were tested for inserted genes and for increased intracellular iron concentration by inductively coupled plasma atomic absorption (ICP-AA). They were grown in Sueoka's modified high salt media with added vitamin B1 and increasing concentration of soluble iron compound (FeCl3 EDTA, from 1× to 8× compared to baseline). The cell magnetic separation conditions were tested using a thin rectangular flow channel pressed against interpolar gaps of a permanent magnet forming a separation system of a well-defined fluid flow and magnetic fringing field geometry (up to 2.2 T and 1000 T/m) dubbed "magnetic deposition microscopy", or MDM. The presence of magnetic cells in suspension was detected by formation of characteristic deposition bands at the edges of the magnet interpolar gaps, amenable to optical scanning and microscopic examination. The results demonstrated increasing cellular Fe uptake with increasing Fe concentration in the culture media in wild type strain and in selected genetically-modified constructs, leading to magnetic separation without magnetic particle binding. The throughput in this study is not sufficient for an economical scale harvest.

  1. Improvement of the Magnetic System of Annular Magnetic Separator%磁选环柱磁系的改进

    Institute of Scientific and Technical Information of China (English)

    陈广振; 王培信; 金镇; 贾西寅

    2013-01-01

    Aiming at the problems of Fe grade in tailings of rough low intensity magnetic separation with annular magnetic separator higher than that of the on-site drum magnetic separator in dressing plant of Dagushan,the modification measures by adding an always-on magnet exciting coil to the annular magnetic separation and installing magnetic yoke rings to all the magnetic exciting coils have conducted.The key parameters of the improved annular magnetic separator were investigated and the beneficiation effects of the annular magnetic separator before and after improvement were contrasted.The result showed that under the same parameters and testing conditions,the improved annular magnetic separation not only guarantees the quality of concentrate,but also the percentage of Fe grade reduces 2.2,and the percentage of Fe recovery increased 2.95,the ideal modification effect was achieved.%针对大孤山选矿厂磁选环柱弱磁粗选尾矿铁品位高于现场筒式磁选机的问题,对原磁选环柱进行了增设1个常通电励磁线圈和在所有励磁线圈上增设聚磁环轭的改造,研究了改进后磁选环柱的重要工作参数,并对改进前后的磁选环柱进行了选矿效果对比.结果表明,在设备工作参数和试验条件相同的情况下,改进后的磁选环柱既保证了精矿质量,又降低了尾矿铁品位2.2个百分点,提高了精矿铁回收率2.95个百分点,达到了理想的改造效果.

  2. Isotope separation in the reflected ion beam in a with a cusp magnetic field

    International Nuclear Information System (INIS)

    The isotope separation in a reflected ion beam injected into a cusp magnetic field has been considered. The magnetic field configuration was formed by two rings with oppositely directed currents. The motion of the particles entering the system and reflected by the increasing magnetic field of the second ring is numerically calculated. A possibility for reflected particles to be separated in the radial direction is shown. This effect allows an annular ion source to be used, which leads to an increase in the total current and the performance of the system

  3. A study on the rare earth ore containing scandium by high gradient magnetic separation

    Institute of Scientific and Technical Information of China (English)

    高利坤; 陈云

    2010-01-01

    Scandium (Sc) concentration from the rare earth ore by high gradient magnetic separation (HGMS) was determined on the basis of Sc content, geophysical parameter determination and the magnetic analyses of the ore. Based on the condition experiments, expanding experiments were carried out. The results showed that the ore had a Sc grade of 48.90 g/t, and after removing iron by low-intensity magnetic separation, a Sc concentrate of 314.89 g/t grade and with 77.53% recovery was obtained by one-stage roughing-one...

  4. The Removal of Iron From Hard Pulverised Kaolin by Dry High–Gradient Magnetic Separation

    OpenAIRE

    Chun, Yu Kang

    1995-01-01

    Deposits of hard kaolin are abundant in China, with kaolin content in the ore exceeding 95%. It is, however, rather difficult to remove iron from the ore. It was demonstrated that wet high–gradient magnetic separation is very efficient in removing the iron compounds from kaolin. For hard kaolin, however, dry high–gradient magnetic separation (HGMS) may be more suitable. To this end, we have developed a new type of dry HGMS device for laboratory use. The separation performance of the device wa...

  5. Immobilization of invertase on chitosan coated γ-Fe2O3 magnetic nanoparticles to facilitate magnetic separation.

    Science.gov (United States)

    Waifalkar, P P; Parit, S B; Chougale, A D; Sahoo, Subasa C; Patil, P S; Patil, P B

    2016-11-15

    Industrially important invertase enzyme was immobilized on chitosan coated sol gel derived γ-Fe2O3 magnetic nanoparticles (MNPs) to enable it for repetitive use by magnetic separation. MNPs were characterized by X-ray diffraction (XRD), dynamic light scattering (DLS), field emission scanning electron microscope (FE-SEM), Fourier transform infrared (FTIR) spectrometer and magnetic measurements. FTIR studies confirmed successful immobilization of invertase on MNPs. The ability to convert sucrose into invert syrup was enhanced in immobilized invertase compared to that of free enzyme. Further it was found that invertase immobilized on MNPs (IIMNPs) were more stable at varying pH and temperature conditions. Magnetic separation technique was successfully employed for reuse of the IIMNPs for 20 times without significant loss of activity. PMID:27501039

  6. Separation of hematite from banded hematite jasper (BHJ) by magnetic coating

    Institute of Scientific and Technical Information of China (English)

    Subhashree Singh; H.Sahoo; S.S.Rath; B.B.Palei; B.Das

    2015-01-01

    The separation of iron oxide from banded hematite jasper (BHJ) assaying 47.8% Fe, 25.6% SiO2 and 2.30%Al2O3 using selective magnetic coating was studied. Characterization studies of the low grade ore indicate that besides hematite and goethite, jasper, a microcrystalline form of quartzite, is the major impurity associated with this ore. Beneficiation by conventional magnetic separation technique could yield a magnetic concentrate containing 60.8% Fe with 51% Fe recovery. In order to enhance the recovery of the iron oxide minerals, fine magnetite, colloidal magnetite and oleate colloidal magnetite were used as the coating material. When subjected to magnetic separation, the coated ore produces an iron concentrate containing 60.2% Fe with an enhanced recovery of 56%. The AFM studies indicate that the coagulation of hematite particles with the oleate colloidal magnetite facilitates the higher recovery of iron particles from the low grade BHJ iron ore under appropriate conditions.

  7. Versatile fabrication of magnetic carbon fiber aerogel applied for bidirectional oil-water separation

    Science.gov (United States)

    Li, Yong; Zhu, Xiaotao; Ge, Bo; Men, Xuehu; Li, Peilong; Zhang, Zhaozhu

    2015-09-01

    Fabricating functional materials that can solve environmental problems resulting from oil or organic solvent pollution is highly desired. However, expensive materials or complicated procedures and unidirectional oil-water separation hamper their applications. Herein, a magnetic superhydrophobic carbon fiber aerogel with high absorption capacity was developed by one-step pyrolysis of Fe(NO3)3-coated cotton in an argon atmosphere. The obtained aerogel can selectively collect oils from oil-polluted region by a magnet bar owing to its magnetic properties and achieves fast oil-water separation for its superhydrophobicity and superoleophilicity. Furthermore, the aerogel performs recyclable oil absorption capacity even after ten cycles of oil-water separation and bears organic solvent immersion. Importantly, the obtained aerogel turns to superhydrophilic and underwater superoleophobic after thermal treatment, allowing it as a promising and efficient material for bidirectional oil-water separation and organic contaminants removal.

  8. Removal of freshwater microalgae by a magnetic separation method

    Science.gov (United States)

    Vergini, Sofia S.; Aravantinou, Andriana F.; Manariotis, Ioannis D.

    2013-04-01

    Some species of microalgae, with high growth rate and high lipid content, appear to be attractive alternatives as a feedstock for biodiesel production. The high-energy input for harvesting biomass and removing the water from the algae makes current commercial microalgal biodiesel production cost expensive. The major techniques currently employed in microalgae harvesting and recovery include centrifugation, coagulation-flocculation, bio-flocculation, filtration and screening, gravity sedimentation, and flotation. The purpose of this study was to investigate the harvesting of microalgae cells by coagulation using magnetic activated carbon, magnetite (FeO4) nanoparticles, and common chemical coagulants. Scenedesmus rubescens was selected and cultivated in 10 L flasks under continuous artificial light. Samples were taken at different operation intervals. Jar tests were conducted to investigate the effect of adsorption of microalgae on the magnetic material. The removal efficiency of microalgae was affected by the coagulants dose, stirring time and speed, and the initial microalgae concentration. The recovery of microalgae was greater in cultures with high initial microalgae concentration compared to cultures with low microalgae concentrations.

  9. Preparation of Immuno-magnetic Beads and Their Separation & Detection to Ovary Cancer Cells

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The organic monomer-molecule with nanometer magnetic powder by means of reforming the surface of nanometer magnetic powder have been synthesized.Magnetic beads in diameter of 2μm or so are obtained by controlling conditions.Ovary cancer cells of ascites are separated and ovary cancer cells of blood are detected by using immuno-magnetic beads linked with ovary cancer cell mono-antibodies.Results show that the specificity is 85%,sensitivity is 87%,accuracy is 84%,cells acquiring purity is 90%,cells activity is 92% and detection sensitivity is 25×10-7.

  10. Probing magnetic phase separation in manganites by nonlinear susceptibility

    International Nuclear Information System (INIS)

    At low frequencies ν≤300Hz, nonlinear magnetic susceptibility of polycrystalline La0.7Pb0.3Mn0.8(Co, Ni)0.2O3 samples near the ferromagnetic (FM)–paramagnetic (PM) phase transition reinforces the earlier observation, based on linear ac susceptibility, that these systems behave as a three-dimensional isotropic dipolar ferromagnet in the asymptotic critical regime and exhibit an isotropic dipolar to isotropic Heisenberg crossover. In addition, the nonlinear susceptibility results reveal the phase segregation of the conducting and insulating FM phases (clusters) within the conducting FM regime and existence of conducting FM clusters in the insulating PM matrix at high frequencies

  11. 永磁强磁选机磁系磁场仿真分析%Simulation analysis on magnet system magnetic field of high intensity permanent magnetic separator

    Institute of Scientific and Technical Information of China (English)

    简辉华; 王卿

    2013-01-01

    After the structure and operation principle of the high intensity permanent magnetic separators being analyzed, finite element analysis software ANSYS was used to simulate the magnet system magnetic field of the separator, and distribution laws of magnetic flux density and magnetic line of force in separation space were obtained. The simulation results showed that the distribution of magnetic field was reasonable and simulated magnetic field intensity was coincident with measured one. The simulation results offered theoretical guide for the study on the same high intensity permanent magnetic separators.%分析了永磁强磁选机的结构与工作原理,并利用ANSYS软件的磁场分析功能,对该机磁系的磁场分布进行了有限元仿真分析,得到了分选空间内磁感应强度和磁力线分布规律.仿真分析结果表明:磁场分布合理,与实际测量磁场强度相符,可为同类永磁强磁选机磁场分布的研究提供参考.

  12. Ferronickel enrichment by fine particle reduction and magnetic separation from nickel laterite ore

    Institute of Scientific and Technical Information of China (English)

    Xiao-hui Tang; Run-zao Liu; Li Yao; Zhi-jun Ji; Yan-ting Zhang; Shi-qi Li

    2014-01-01

    Ferronickel enrichment and extraction from nickel laterite ore were studied through reduction and magnetic separation. Reduction experiments were performed using hydrogen and carbon monoxide as reductants at different temperatures (700-1000°C). Magnetic separa-tion of the reduced products was conducted using a SLon-100 cycle pulsating magnetic separator (1.2 T). Composition analysis indicates that the nickel laterite ore contains a total iron content of 22.50wt%and a total nickel content of 1.91wt%. Its mineral composition mainly con-sists of serpentine, hortonolite, and goethite. During the reduction process, the grade of nickel and iron in the products increases with in-creasing reduction temperature. Although a higher temperature is more favorable for reduction, the temperature exceeding 1000°C results in sintering of the products, preventing magnetic separation. After magnetic separation, the maximum total nickel and iron concentrations are 5.43wt%and 56.86wt%, and the corresponding recovery rates are 84.38%and 53.76%, respectively.

  13. Metalizing reduction and magnetic separation of vanadium titano-magnetite based on hot briquetting

    Institute of Scientific and Technical Information of China (English)

    Shuang-yin Chen; Man-sheng Chu

    2014-01-01

    To achieve high efficiency utilization of Panzhihua vanadium titano-magnetite, a new process of metalizing reduction and mag-netic separation based on hot briquetting is proposed, and factors that affect the cold strength of the hot-briquetting products and the effi-ciency of reduction and magnetic separation are successively investigated through laboratory experiments. The relevant mechanisms are elu-cidated on the basis of microstructural observations. Experimental results show that the optimal process parameters for hot briquetting in-clude a hot briquetting temperature of 475°C, a carbon ratio of 1.2, ore and coal particle sizes of less than 74 µm. Additionally, with respect to metalizing reduction and magnetic separation, the rational parameters include a magnetic field intensity of 50 mT, a reduction temperature of 1350°C, a reduction time of 60 min, and a carbon ratio of 1.2. Under these above conditions, the crushing strength of the hot-briquetting agglomerates is 1480 N, and the recovery ratios of iron, vanadium, and titanium are as high as 91.19%, 61.82%, and 85.31%, respectively. The new process of metalizing reduction and magnetic separation based on hot briquetting demonstrates the evident technological advan-tages of high efficiency separation of iron from other valuable elements in the vanadium titano-magnetite.

  14. Separator reconnection at Earth's dayside magnetopause under generic northward interplanetary magnetic field conditions

    Science.gov (United States)

    Dorelli, John C.; Bhattacharjee, Amitava; Raeder, Joachim

    2007-02-01

    We investigate the global properties of magnetic reconnection at the dayside terrestrial magnetopause under generic northward interplanetary magnetic field (IMF) conditions. In particular, we consider a zero dipole tilt case where the y and z components of the IMF (in GSM coordinates) are equal in magnitude, using three-dimensional resistive magnetohydrodynamics (MHD) simulations to address the following questions: (1) What is the geometry of the dayside X line? (2) How is current density distributed over the magnetopause surface? Using a technique described by Geene (1992) to track the magnetic nulls in the system, we identify the dayside X line as a magnetic separator line, a segment of a magnetic field line which extends across the dayside magnetopause, terminating in the cusps. We demonstrate that the separator line is the intersection of two separatrix surfaces which define volumes containing topologically distinct field lines. Parallel current density, proportional to the parallel electric field in our resistive MHD simulations, is distributed in a broad, thin sheet which extends across the separator line and terminates in the cusps. Thus separator reconnection at the dayside magnetopause displays features of both antiparallel (near the cusp nulls) and component (near the subsolar separator line) reconnection. We discuss some implications of our results for spacecraft observations of reconnection signatures.

  15. Magnetically assisted chemical separation (MACS) process: Preparation and optimization of particles for removal of transuranic elements

    International Nuclear Information System (INIS)

    The Magnetically Assisted Chemical Separation (MACS) process combines the selectivity afforded by solvent extractants with magnetic separation by using specially coated magnetic particles to provide a more efficient chemical separation of transuranic (TRU) elements, other radionuclides, and heavy metals from waste streams. Development of the MACS process uses chemical and physical techniques to elucidate the properties of particle coatings and the extent of radiolytic and chemical damage to the particles, and to optimize the stages of loading, extraction, and particle regeneration. This report describes the development of a separation process for TRU elements from various high-level waste streams. Polymer-coated ferromagnetic particles with an adsorbed layer of octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) diluted with tributyl phosphate (TBP) were evaluated for use in the separation and recovery of americium and plutonium from nuclear waste solutions. Due to their chemical nature, these extractants selectively complex americium and plutonium contaminants onto the particles, which can then be recovered from the solution by using a magnet. The partition coefficients were larger than those expected based on liquid[liquid extractions, and the extraction proceeded with rapid kinetics. Extractants were stripped from the particles with alcohols and 400-fold volume reductions were achieved. Particles were more sensitive to acid hydrolysis than to radiolysis. Overall, the optimization of a suitable NMCS particle for TRU separation was achieved under simulant conditions, and a MACS unit is currently being designed for an in-lab demonstration

  16. Magnetically assisted chemical separation (MACS) process: Preparation and optimization of particles for removal of transuranic elements

    Energy Technology Data Exchange (ETDEWEB)

    Nunez, L.; Kaminski, M.; Bradley, C.; Buchholz, B.A.; Aase, S.B.; Tuazon, H.E.; Vandegrift, G.F. [Argonne National Lab., IL (United States); Landsberger, S. [Univ. of Illinois, Urbana, IL (United States)

    1995-05-01

    The Magnetically Assisted Chemical Separation (MACS) process combines the selectivity afforded by solvent extractants with magnetic separation by using specially coated magnetic particles to provide a more efficient chemical separation of transuranic (TRU) elements, other radionuclides, and heavy metals from waste streams. Development of the MACS process uses chemical and physical techniques to elucidate the properties of particle coatings and the extent of radiolytic and chemical damage to the particles, and to optimize the stages of loading, extraction, and particle regeneration. This report describes the development of a separation process for TRU elements from various high-level waste streams. Polymer-coated ferromagnetic particles with an adsorbed layer of octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) diluted with tributyl phosphate (TBP) were evaluated for use in the separation and recovery of americium and plutonium from nuclear waste solutions. Due to their chemical nature, these extractants selectively complex americium and plutonium contaminants onto the particles, which can then be recovered from the solution by using a magnet. The partition coefficients were larger than those expected based on liquid[liquid extractions, and the extraction proceeded with rapid kinetics. Extractants were stripped from the particles with alcohols and 400-fold volume reductions were achieved. Particles were more sensitive to acid hydrolysis than to radiolysis. Overall, the optimization of a suitable NMCS particle for TRU separation was achieved under simulant conditions, and a MACS unit is currently being designed for an in-lab demonstration.

  17. Separating the ferromagnetic and glassy behavior within the metal-organic magnet Ni (TCNQ) 2

    Science.gov (United States)

    Berlie, Adam; Terry, Ian; Szablewski, Marek; Giblin, Sean R.

    2015-11-01

    An in-depth study of the metal-organic magnet Ni (TCNQ) 2 was conducted where the deuterated form was synthesised both to attempt to alter the magnetic properties of the material and to be advantageous in techniques such as neutron scattering and muon spectroscopy. Deuteration saw a 3 K increase in TC with magnetization and heat capacity measurements demonstrating a spin wave contribution at low temperatures confirming the 3D nature of the ferromagnetic state shown by Ni (TCNQ-D4)2 . AC susceptibility results suggest there is a glassy component associated with the magnetically ordered state, though muon spectroscopy measurements did not support the presence of a spin glass state. Instead muon spectroscopy at zero magnetic field indicated the presence of two magnetic transitions, one at 20 K and another below 6 K; the latter is likely due to the system entering a quasistatic regime, similar to what one might expect of a superspin or cluster glass. Neutron diffraction measurements further supported this by revealing very weak magnetic Bragg peaks suggesting that the magnetism may have a short coherence length and be confined to small grains or clusters. The separation of the ferromagnetic and glassy magnetic components of the material's properties suggest that this system may show promise as a metal-organic magnet which is easily modified to change its magnetic properties, providing larger grain sizes can be synthesized.

  18. Particle Capture Efficiency in a Multi-Wire Model for High Gradient Magnetic Separation

    CERN Document Server

    Eisenträger, Almut; Griffiths, Ian M

    2014-01-01

    High gradient magnetic separation (HGMS) is an efficient way to remove magnetic and paramagnetic particles, such as heavy metals, from waste water. As the suspension flows through a magnetized filter mesh, high magnetic gradients around the wires attract and capture the particles, removing them from the fluid. We model such a system by considering the motion of a paramagnetic tracer particle through a periodic array of magnetized cylinders. We show that there is a critical Mason number (ratio of viscous to magnetic forces) below which the particle is captured irrespective of its initial position in the array. Above this threshold, particle capture is only partially successful and depends on the particle's entry position. We determine the relationship between the critical Mason number and the system geometry using numerical and asymptotic calculations. If a capture efficiency below 100% is sufficient, our results demonstrate how operating the HGMS system above the critical Mason number but with multiple separa...

  19. Magnetophoresis 'meets' viscoelasticity: deterministic separation of magnetic particles in a modular microfluidic device.

    Science.gov (United States)

    Del Giudice, Francesco; Madadi, Hojjat; Villone, Massimiliano M; D'Avino, Gaetano; Cusano, Angela M; Vecchione, Raffaele; Ventre, Maurizio; Maffettone, Pier Luca; Netti, Paolo A

    2015-04-21

    The deflection of magnetic beads in a microfluidic channel through magnetophoresis can be improved if the particles are somehow focused along the same streamline in the device. We design and fabricate a microfluidic device made of two modules, each one performing a unit operation. A suspension of magnetic beads in a viscoelastic medium is fed to the first module, which is a straight rectangular-shaped channel. Here, the magnetic particles are focused by exploiting fluid viscoelasticity. Such a channel is one inlet of the second module, which is a H-shaped channel, where a buffer stream is injected in the second inlet. A permanent magnet is used to displace the magnetic beads from the original to the buffer stream. Experiments with a Newtonian suspending fluid, where no focusing occurs, are carried out for comparison. When viscoelastic focusing and magnetophoresis are combined, magnetic particles can be deterministically separated from the original streamflow to the buffer, thus leading to a high deflection efficiency (up to ~96%) in a wide range of flow rates. The effect of the focusing length on the deflection of particles is also investigated. Finally, the proposed modular device is tested to separate magnetic and non-magnetic beads. PMID:25732596

  20. Simulating Chiral Magnetic and Separation Effects with Spin-Orbit Coupled Atomic Gases.

    Science.gov (United States)

    Huang, Xu-Guang

    2016-01-01

    The chiral magnetic and chiral separation effects-quantum-anomaly-induced electric current and chiral current along an external magnetic field in parity-odd quark-gluon plasma-have received intense studies in the community of heavy-ion collision physics. We show that analogous effects occur in rotating trapped Fermi gases with Weyl-Zeeman spin-orbit coupling where the rotation plays the role of an external magnetic field. These effects can induce a mass quadrupole in the atomic cloud along the rotation axis which may be tested in future experiments. Our results suggest that the spin-orbit coupled atomic gases are potential simulators of the chiral magnetic and separation effects. PMID:26868084

  1. A Mathematical Model for The Separation of Viscous Liquid Flow by Magnetic Field

    OpenAIRE

    Hassanov, Hikmet

    2003-01-01

    Inverse problem of the two - phase liquid flow separation on components under magnetic field action is firstly resolved at given law of the moving boundary alteration. Automodel solution is established, which may be approximated till various areas of dimensionless variable O. It is found the relationship between the phase radius r o and magnetic properties of the liquid involved. The dependence of velocity function on rheological parameters of the liquid is estimated. The changes of the liqui...

  2. Electronic and Magnetic Nano Phase Separation in Cobaltates La₂₋ₓSrₓCoO₄

    OpenAIRE

    Li, Z W; Drees, Y.; Ricci, A.; Lamago, D.; Piovano, A.; M. Rotter; Schmidt, W.; Sobolev, O.; Rütt, U.; Gutowski, O.; Sprung, M.; Castellan, J. P.; Tjeng, L. H.; Komarek, A. C.

    2016-01-01

    The single-layer perovskite cobaltates have attracted enormous attention due to the recent observation of hour-glass shaped magnetic excitation spectra which resemble the ones of the famous high-temperature superconducting cuprates. Here, we present an overview of our most recent studies of the spin and charge correlations in floating-zone grown cobaltate single crystals. We find that frustration and a novel kind of electronic and magnetic nano phase separation are intimately connected to the...

  3. MULTILEVEL (3D) MICROFLUIDIC TECHNOLOGY FOR AN INNOVATIVE MAGNETIC CELL SEPARATION PLATFORM

    OpenAIRE

    Fouet, Marc; Cargou, Sébastien; Courson, Rémi; Blatché, Charline; Montrose, A.; Reybier, K; Gué, Anne-Marie

    2014-01-01

    We demonstrate a new concept of devices, which by combining 3D fluid engineering and localized mag-netic actuation enables the full integration of a cell tagging and magnetic separation device. We used a low cost, commercially available dry film (EMS Inc, Ohio, USA) that fits microfluidic requirements and gives the possibility to build easily 3D microfluidic structures. The labelling of blood monocytes with su-perparamagnetic particles was performed "up stream" with the aim of a microparticle...

  4. Theoretical and Experimental Study of the Magnetic Separation of Pollutants from Wastewater

    OpenAIRE

    Mariani, Giacomo

    2010-01-01

    This Thesys reports the study of a HGMS (High GradientMagnetic Separation) process for the treatment of industrialwastewaters that considers an assisted chemical-physical pre-treatment for the removal of heavy metals through the bound by adsorption with added iron-oxide particulate matter (hematite). The considered filter, constituted by ferromagnetic stainless steel wool and permanent magnets, is studied with a new approach based on a statistical analysis that requires the study of the traje...

  5. Comprehensive Utilization of Ludwigite Ore Based on Metallizing Reduction and Magnetic Separation

    Institute of Scientific and Technical Information of China (English)

    Xiao-jiao FU; Jia-qi ZHAO; Shuang-yin CHEN; Zheng-gen LIU; Tong-lai GUO; Man-sheng CHU

    2015-01-01

    With the aim of high-efifciency utilization of Dandong ludwigite ore, a new process of metallizing reduction and mag-netic separation was proposed, and the effects of reduction temperature, reduction time, carbon ratio, ore size and coal size on the efifciency of the process were investigated in details, and relevant mechanisms were elucidated by SEM and EDS. The optimum technological parameters for metallizing reduction and magnetic separation on ludwigite ore were obtained as reduction tempera-ture of 1 250 °C, reduction time of 60 min, carbon ratio of 1.4, ore size of 0.500−2.000 mm, and coal size of 0.50−1.50 mm. After adopting the optimum parameters, the iron content and recovery ratio of iron in magnetic substance are 87.78% and 88.02%, re-spectively, while the recovery ratios of boron, magnesium and silicon in non-magnetic substance are 88.86%, 94.60% and 98.66%, respectively. After metallizing reduction and magnetic separation, valuable elements of ludwigite ore could be separated and uti-lized in subsequent steelmaking process and hydrometallurgy process.

  6. Thinking out of the box for magnetic mineral separation using low temperature magnetism

    Science.gov (United States)

    Lagroix, F.; Guyodo, Y. J. B.; Till, J. L.; Taylor, S. N.

    2014-12-01

    One timeless challenge in rock magnetic studies, inclusive of paleomagnetism and environmental magnetism, is decomposing a sample's bulk magnetic behaviour into its individual magnetic mineral components. We present a method permitting to decompose the magnetic behavior of a bulk sample experimentally and at low temperature avoiding any ambiguities in data interpretation due to heating induced alteration. A single instrument is used to measure the temperature dependence of the remanent magnetization and to apply different steps of AF demagnetizations and thermal demagnetization. The experimental method is validated on synthetic mixtures of magnetite, hematite, goethite as well as on natural loess samples where the contributions of magnetite, goethite, hematite and maghemite are successfully isolated. The experimental protocol can be adapted to target other iron bearing minerals relevant to the rock or sediment under study. One limitation rests on the fact that the method is based on remanent magnetization. Consequently, a quantitative decomposition of absolute concentration of individual components remains unachievable without assumptions. Nonetheless, semi-quantitative magnetic mineral concentrations were determined on synthetic and natural loess/paleosol samples in order to validate and test the method as a semi-quantitative tool in environmental magnetism studies.

  7. Separation of Variables in the Classical Integrable SL(3) Magnetic Chain

    OpenAIRE

    Sklyanin, E. K.

    1992-01-01

    There are two fundamental problems studied by the theory of hamiltonian integrable systems: integration of equations of motion, and construction of action-angle variables. The third problem, however, should be added to the list: separation of variables. Though much simpler than two others, it has important relations to the quantum integrability. Separation of variables is constructed for the $SL(3)$ magnetic chain --- an example of integrable model associated to a nonhyperelliptic algebraic c...

  8. Recovery of iron from cyanide tailings with reduction roasting-water leaching followed by magnetic separation

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Yali; Li, Huaimei [College of Chemical Engineering, Shandong University of Technology, 255081, Zibo, Shandong (China); Yu, Xianjin, E-mail: xjy@sdut.edu.cn [College of Chemical Engineering, Shandong University of Technology, 255081, Zibo, Shandong (China)

    2012-04-30

    Highlights: Black-Right-Pointing-Pointer Using reduction roasting-water leaching-magnetic separation method, the recovery of iron from cyanide tailings was optimized. Black-Right-Pointing-Pointer The recovery of iron was highly depended on the water-leaching process after reduction roasting. Black-Right-Pointing-Pointer The results suggest that the method can be effectively used for iron recovery, and the grade of magnetic concentrate and recovery rate can reach 59.11% and 75.12%, respectively. - Abstract: Cyanide tailing is a kind of solid waste produced in the process of gold extraction from gold ore. In this paper, recovery of iron from cyanide tailings was studied with reduction roasting-water leaching process followed by magnetic separation. After analysis of chemical composition and crystalline phase, the effects of different parameters on recovery of iron were chiefly introduced. Systematic studies indicate that the high recovery rate and grade of magnetic concentrate of iron can be achieved under the following conditions: weight ratios of cyanide tailings/activated carbon/sodium carbonate/sodium sulfate, 100:10:3:10; temperature, 50 Degree-Sign C; time, 60 min at the reduction roasting stage; the liquid to solid ratio is 15:1 (ml/g), leaching at 60 Degree-Sign C for 5 min and stirring speed at 20 r/min at water-leaching; exciting current is 2 A at magnetic separation. The iron grade of magnetic concentrate was 59.11% and the recovery ratio was 75.12%. The mineralography of cyanide tailings, roasted product, water-leached sample, magnetic concentrate and magnetic tailings were studied by X-ray powder diffraction (XRD) technique. The microstructures of above products except magnetic tailings were also analyzed by scanning electron microscope (SEM) and energy disperse spectroscopy (EDS) to help understand the mechanism.

  9. Quantification of Non-Specific Binding of Magnetic Micro and Nano particles using Cell Tracking Velocimetry: Implication for magnetic cell separation and detection

    OpenAIRE

    Chalmers, J. J.; Xiong, Y; X. Jin; Shao, M.; Tong, X; Farag, S.; Zborowski, M.

    2010-01-01

    The maturation of magnetic cell separation technology places increasing demands on magnetic cell separation performance. While a number of factors can cause suboptimal performance, one of the major challenges can be non-specific binding of magnetic nano or micro particles to non-targeted cells. Depending on the type of separation, this non-specific binding can have a negative effect on the final purity, the recovery of the targeted cells, or both. In this work, we quantitatively demonstrate t...

  10. Simulating Chiral Magnetic and Separation Effects with Spin-Orbit Coupled Atomic Gases

    OpenAIRE

    Xu-Guang Huang

    2016-01-01

    The chiral magnetic and chiral separation effects---quantum-anomaly-induced electric current and chiral current along an external magnetic field in parity-odd quark-gluon plasma---have received intense studies in the community of heavy-ion collision physics. We show that analogous effects occur in rotating trapped Fermi gases with Weyl-Zeeman spin-orbit coupling where the rotation plays the role of an external magnetic field. These effects can induce a mass quadrupole in the atomic cloud alon...

  11. On-chip free-flow magnetophoresis: Separation and detection of mixtures of magnetic particles in continuous flow

    NARCIS (Netherlands)

    Pamme, Nicole; Eijkel, Jan C.T.; Manz, Andreas

    2006-01-01

    The complete separation of mixtures of magnetic particles was achieved by on-chip free-flow magnetophoresis. In continuous flow, magnetic particles were deflected from the direction of larninar flow by a perpendicular magnetic field depending on their magnetic susceptibility and size and on the flow

  12. "On-chip magnetic bead microarray using hydrodynamic focusing in a passive magnetic separator"

    DEFF Research Database (Denmark)

    Smistrup, Kristian; Kjeldsen, B.; Reimers, R.L.;

    2005-01-01

    Implementing DNA and protein microarrays into lab-on-a-chip systems can be problematic since these are sensitive to heat and strong chemicals. Here, we describe the functionalization of a microchannel with two types of magnetic beads using hydrodynamic focusing combined with a passive magnetic...

  13. Design of large aperture superferric quadrupole magnets for an in-flight fragment separator

    Energy Technology Data Exchange (ETDEWEB)

    Zaghloul, Aziz; Kim, Dogyun; Kim, Jangyoul; Kim, Mijung; Kim, Myeongjin; Yun, Chongcheoul; Kim, Jongwon [Rare Isotope Science Project, Institute for Basic Science, Yuseong, Daejeon, 305-811 (Korea, Republic of)

    2014-01-29

    Superferric quadrupole magnets to be used for in-flight fragment separator have been designed. A quadrupole magnet triplet for beam focusing is placed in a cryostat together with superconducting correction coils. To maximize acceptance of rare isotope beams produced by projectile fragmentation, it is essential to use large-aperture quadrupole magnets. The pole tip radius is 17 cm in the current design, and we tried to enlarge the aperture with 3D analysis on magnetic fields. In the front end of the separator, where a target and beam dump are located, we plan to use two sets of quadrupole triplets made of high-Tc superconductor (HTS) operating at 20-50 K considering high radiation heat load. The HTS magnet will use warm iron poles. Both low-Tc and high-Tc superconductors are acquired for test winding, and two kinds of dewar and cryostat are under construction to perform the coil and magnet tests. The magnetic design of superferric quadrupole is mainly discussed.

  14. Purification of condenser water in thermal power station by superconducting magnetic separation

    Science.gov (United States)

    Ha, D. W.; Kwon, J. M.; Baik, S. K.; Lee, Y. J.; Han, K. S.; Ko, R. K.; Sohn, M. H.; Seong, K. C.

    2011-11-01

    Thermal power station is made up of a steam turbine and a steam condenser which need a lot of water. The water of steam condenser should be replaced, since scales consisting of iron oxide mainly are accumulated on the surface of condenser pipes as it goes. Superconducting high gradient magnetic separation (HGMS) system has merits to remove paramagnetic substance like iron oxides because it can generate higher magnetic field strength than electromagnet or permanent magnet. In this paper, cryo-cooled Nb-Ti superconducting magnet that can generate up to 6 T was used for HGMS systems. Magnetic filters were designed by the analysis of magnetic field distribution at superconducting magnets. The result of X-ray analysis showed contaminants were mostly α-Fe 2O 3 (hematite) and γ-Fe 2O 3 (maghemite). The higher magnetic field was applied up to 6 T, the more iron oxides were removed. As the wire diameter of magnetic filter decreased, the turbidity removal of the sample was enhanced.

  15. Magnetic Separation-Assistant Fluorescence Resonance Energy Transfer Inhibition for Highly Sensitive Probing of Nucleolin.

    Science.gov (United States)

    Li, Yan-Ran; Liu, Qian; Hong, Zhangyong; Wang, He-Fang

    2015-12-15

    For the widely used "off-on" fluorescence (or phosphorescence) resonance energy transfer (FRET or PRET) system, the separation of donors and acceptors species was vital for enhancing the sensitivity. To date, separation of free donors from FRET/PRET inhibition systems was somewhat not convenient, whereas separation of the target-induced far-between acceptors has hardly been reported yet. We presented here a novel magnetic separation-assistant fluorescence resonance energy transfer (MS-FRET) inhibition strategy for highly sensitive detection of nucleolin using Cy5.5-AS1411 as the donor and Fe3O4-polypyrrole core-shell (Fe3O4@PPY) nanoparticles as the NIR quenching acceptor. Due to hydrophobic interaction and π-π stacking of AS1411 and PPY, Cy5.5-AS1411 was bound onto the surface of Fe3O4@PPY, resulting in 90% of fluorescence quenching of Cy5.5-AS1411. Owing to the much stronger specific interaction of AS1411 and nucleolin, the presence of nucleolin could take Cy5.5-AS1411 apart from Fe3O4@PPY and restore the fluorescence of Cy5.5-AS1411. The superparamagnetism of Fe3O4@PPY enabled all separations and fluorescence measurements complete in the same quartz cell, and thus allowed the convenient but accurate comparison of the sensitivity and fluorescence recovery in the cases of separation or nonseparation. Compared to nonseparation FRET inhibition, the separation of free Cy5.5-AS1411 from Cy5.5-AS1411-Fe3O4@PPY solution (the first magnetic separation, MS-1) had as high as 25-fold enhancement of the sensitivity, whereas further separation of the nucleolin-inducing far-between Fe3O4@PPY from the FRET inhibition solution (the second magnetic separation, MS-2) could further enhance the sensitivity to 35-fold. Finally, the MS-FRET inhibition assay displayed the linear range of 0.625-27.5 μg L(-1) (8.1-359 pM) and detection limit of 0.04 μg L(-1) (0.05 pM) of nucleolin. The fluorescence intensity recovery (the percentage ratio of the final restoring fluorescence intensity

  16. High intensity magnetic separation for the clean-up of a site polluted by lead metallurgy.

    Science.gov (United States)

    Sierra, C; Martínez, J; Menéndez-Aguado, J M; Afif, E; Gallego, J R

    2013-03-15

    The industrial history in the district of Linares (Spain) has had a severe impact on soil quality. Here we examined soil contaminated by lead and other heavy metals in "La Cruz" site, a brownfield affected by metallurgical residues. Initially, the presence of contaminants mainly associated with the presence of lead slag fragments mixed with the soil was evaluated. The subsequent analysis showed a quasi-uniform distribution of the pollution irrespective of the grain-size fractions. This study was accompanied by a characterization of the lead slag behavior under the presence of a magnetic field. Two main magnetic components were detected: first a ferromagnetic and/or ferrimagnetic contribution, second a paramagnetic and/or antiferromagnetic one. It was also established that the slag was composed mainly of lead spherules and iron oxides embedded in a silicate matrix. Under these conditions, the capacity of magnetic separation to remove pollutants was examined. Therefore, two high intensity magnetic separators (dry and wet devices, respectively) were used. Dry separation proved to be successful at decontaminating soil in the first stages of a soil washing plant. In contrast, wet separation was found effective as a post-process for the finer fractions.

  17. Nuclear charge and isobar separation in a gas-filled enge split-pole magnetic spectrograph

    International Nuclear Information System (INIS)

    The sepration technique is based on the fact that charge-changing processes of an ion in a gas, if they occur frequently enough in a magnetic field region, lead to trajectories determined by the average charge state of the ion in the gas. The technique has been used to separate isobaric 58Ni and 58Fe ions. 7 refs., 4 figs., 1 tab

  18. APPLICATION OF HIGH-GRADIENT MAGNETIC SEPARATION TO FINE PARTICLE CONTROL

    Science.gov (United States)

    The report gives results of an assessment of the potential use of high-gradient magnetic separation (HGMS) as a means of collecting gas stream particulates. The assessment included both experiments and analyses of theoretical models. Phase I included evaluations of theoretical ex...

  19. Separation and enrichment of enantiopure from racemic compounds using magnetic levitation.

    Science.gov (United States)

    Yang, Xiaochuan; Wong, Shin Yee; Bwambok, David K; Atkinson, Manza B J; Zhang, Xi; Whitesides, George M; Myerson, Allan S

    2014-07-18

    Crystallization of a solution with high enantiomeric excess can generate a mixture of crystals of the desired enantiomer and the racemic compound. Using a mixture of S-/RS-ibuprofen crystals as a model, we demonstrated that magnetic levitation (MagLev) is a useful technique for analysis, separation and enantioenrichment of chiral/racemic products. PMID:24875274

  20. Separation of flow from chiral magnetic effect in U+U collisions using spectator asymmetry

    CERN Document Server

    Chatterjee, Sandeep

    2014-01-01

    We demonstrate that the prolate shape of the Uranium nucleus generates anti-correlation between spectator asymmetry and initial state ellipticity of the collision zone, providing a way to constrain the initial event shape in U+U collisions. As an application, we show that this can be used to separate the background contribution due to flow from the signals of chiral magnetic effect.

  1. Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

    Directory of Open Access Journals (Sweden)

    Gcina Mamba

    2016-06-01

    Full Text Available Organic and inorganic compounds utilised at different stages of various industrial processes are lost into effluent water and eventually find their way into fresh water sources where they cause devastating effects on the ecosystem due to their stability, toxicity, and non-biodegradable nature. Semiconductor photocatalysis has been highlighted as a promising technology for the treatment of water laden with organic, inorganic, and microbial pollutants. However, these semiconductor photocatalysts are applied in powdered form, which makes separation and recycling after treatment extremely difficult. This not only leads to loss of the photocatalyst but also to secondary pollution by the photocatalyst particles. The introduction of various magnetic nanoparticles such as magnetite, maghemite, ferrites, etc. into the photocatalyst matrix has recently become an area of intense research because it allows for the easy separation of the photocatalyst from the treated water using an external magnetic field. Herein, we discuss the recent developments in terms of synthesis and photocatalytic properties of magnetically separable nanocomposites towards water treatment. The influence of the magnetic nanoparticles in the optical properties, charge transfer mechanism, and overall photocatalytic activity is deliberated based on selected results. We conclude the review by providing summary remarks on the successes of magnetic photocatalysts and present some of the future challenges regarding the exploitation of these materials in water treatment.

  2. Double-Layer Magnetic Nanoparticle-Embedded Silica Particles for Efficient Bio-Separation.

    Directory of Open Access Journals (Sweden)

    San Kyeong

    Full Text Available Superparamagnetic Fe3O4 nanoparticles (NPs based nanomaterials have been exploited in various biotechnology fields including biomolecule separation. However, slow accumulation of Fe3O4 NPs by magnets may limit broad applications of Fe3O4 NP-based nanomaterials. In this study, we report fabrication of Fe3O4 NPs double-layered silica nanoparticles (DL MNPs with a silica core and highly packed Fe3O4 NPs layers. The DL MNPs had a superparamagnetic property and efficient accumulation kinetics under an external magnetic field. Moreover, the magnetic field-exposed DL MNPs show quantitative accumulation, whereas Fe3O4 NPs single-layered silica nanoparticles (SL MNPs and silica-coated Fe3O4 NPs produced a saturated plateau under full recovery of the NPs. DL MNPs are promising nanomaterials with great potential to separate and analyze biomolecules.

  3. Semi-continuous in situ magnetic separation for enhanced extracellular protease productionmodeling and experimental validation

    DEFF Research Database (Denmark)

    Cerff, M.; Scholz, A.; Käppler, T.;

    2013-01-01

    In modern biotechnology proteases play a major role as detergent ingredients. Especially the production of extracellular protease by Bacillus species facilitates downstream processing because the protease can be directly harvested from the biosuspension. In situ magnetic separation (ISMS) constit......In modern biotechnology proteases play a major role as detergent ingredients. Especially the production of extracellular protease by Bacillus species facilitates downstream processing because the protease can be directly harvested from the biosuspension. In situ magnetic separation (ISMS......) constitutes an excellent adsorptive method for efficient extracellular protease removal during cultivation. In this work, the impact of semi‐continuous ISMS on the overall protease yield has been investigated. Results reveal significant removal of the protease from Bacillus licheniformis cultivations....... Bacitracin‐functionalized magnetic particles were successfully applied, regenerated and reused up to 30 times. Immediate reproduction of the protease after ISMS proved the biocompatibility of this integrated approach. Six subsequent ISMS steps significantly increased the overall protease yield up to 98...

  4. About the Equations of Motion of a Magnetic Particle in a Magnetic Separator

    OpenAIRE

    Mostika, Yu. S.; Karmazin, V. I.; Shutov, V. Yu.; Grebenyuk, L. Z.

    1999-01-01

    Equations of motion of magnetic particles in the flow medium near a cylindrical ferromagnetic collector have been developed. A vector equation, expressing the balance of the inertia force and the vector sum of three forces: the magnetic, the gravitational and the hydrodynamic drag force of a particle was taken as the initial equation. Reduced equations obtained from the initial one by rejection of terms corresponding to the inertia or the gravitational force were also considered. Examples of ...

  5. Magnetic separation of Dy(III) ions from homogeneous aqueous solutions

    International Nuclear Information System (INIS)

    The possibility to enrich paramagnetic dysprosium(III) ions in a magnetic field gradient is proved by means of interferometry, which may open the route for a magnetic separation of rare earth ions from aqueous solutions. The separation dynamics are studied for three different concentrations of DyCl3 and compared with those found recently in a sulphate solution of the 3d ion Mn(II). In view of the similar-sized hydration spheres for Dy(III) and Mn(II), the slower separation dynamics in DyCl3 is attributed to both a higher densification coefficient and the strong impact of Brownian motion due to the absence of ion-pair clusters

  6. Particle capture efficiency in a multi-wire model for high gradient magnetic separation

    KAUST Repository

    Eisenträger, Almut

    2014-07-21

    High gradient magnetic separation (HGMS) is an efficient way to remove magnetic and paramagnetic particles, such as heavy metals, from waste water. As the suspension flows through a magnetized filter mesh, high magnetic gradients around the wires attract and capture the particles removing them from the fluid. We model such a system by considering the motion of a paramagnetic tracer particle through a periodic array of magnetized cylinders. We show that there is a critical Mason number (ratio of viscous to magnetic forces) below which the particle is captured irrespective of its initial position in the array. Above this threshold, particle capture is only partially successful and depends on the particle\\'s entry position. We determine the relationship between the critical Mason number and the system geometry using numerical and asymptotic calculations. If a capture efficiency below 100% is sufficient, our results demonstrate how operating the HGMS system above the critical Mason number but with multiple separation cycles may increase efficiency. © 2014 AIP Publishing LLC.

  7. Measurement of the adhesion force between particles for high gradient magnetic separation of pneumatic conveyed powder products

    Energy Technology Data Exchange (ETDEWEB)

    Senkawa, K., E-mail: senkawa@qb.see.eng.osaka-u.ac.jp [Osaka University, A1 Bldg, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan); Nakai, Y.; Mishima, F.; Akiyama, Y.; Nishijima, S. [Osaka University, A1 Bldg, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

    2011-11-15

    In the industrial plants such as foods, medicines or industrial materials, there are big amount of issues on contamination by metallic wear debris originated from pipes of manufacturing lines. In this study, we developed a high gradient magnetic separation system (HGMS) under the dry process by using superconducting magnet to remove the ferromagnetic particles. One of the major problems of dry HGMS systems is, however, the blockage of magnetic filter caused by particle coagulation or deposition. In order to actualize the magnetic separation without blockage, we introduced pneumatic conveyance system as a new method to feed the powder. It is important to increase the drag force acting on the sufficiently dispersed particles, which require strong magnetic fields. To generate the strong magnetic fields, HGMS technique was examined which consists of a magnetic filter and a superconducting solenoid magnet. As a result of the magnetic separation experiment, it was shown that the separation efficiency changes due to the difference of the cohesive property of the particles. On the basis of the result, the adhesion force which acts between the ferromagnetic particles and the medium particles used for the magnetic separation was measured by Atomic Force Microscope (AFM), and cohesion of particles was studied from the aspect of interparticle interaction. We assessed a suitable flow velocity for magnetic separation according to the cohesive property of each particle based on the result.

  8. Development of 5 T NbTi Superconducting Magnet with 160 mm Warm Bore for Magnetic Separation

    Institute of Scientific and Technical Information of China (English)

    SHI Yi; WU Yu; LI Shaolei

    2008-01-01

    A wide-bore 5 T NbTi superconducting magnet,for magnetic separator,with an operational current of 106 A is designed and fabricated. This magnet with a φ60 mm room temperature bore is installed in a vacuum cryostat and immersed in liquid helium.A two-stage 4 K Gifford-McMahon (GM) cryocooler is used to maintain the cooling shield at 70 K and the condenser at 4 K in order to achieve the zero vaporization loss of liquid helium. The cooling power of the GM cryocooler is 1.5 W.In this paper,the design,heat leakage,stress analysis,quench protection characteristics and preliminary test results are presented.

  9. Model Magnet Development of D1 Beam Separation Dipole for the HL-LHC Upgrade

    CERN Document Server

    Nakamoto, T; Kawamata, H; Enomoto, S; Higashi, N; Idesaki, A; Iio, M; Ikemoto, Y; Iwasaki, R; Kimura, N; Ogitsu, T; Okada, N; Sasaki, K I; Yoshida, M; Todesco, E

    2015-01-01

    KEK has been conducting the design study of the beam separation dipole magnet, D1, for the High Luminosity LHC (HL-LHC) upgrade within a framework of the CERN-KEK collaboration. The D1 magnet has a coil aperture of 150 mm using Nb-Ti superconducting cable and the nominal dipole field of 5.6 T can be generated at 12 kA and 1.9 K. A field integral of 35 T·m is required. The development of the 2-m-long model magnet has been started since May 2013. This paper describes the development status of the short model magnet as well as advancement of the fundamental design studies.

  10. Magnetic deep eutectic solvents molecularly imprinted polymers for the selective recognition and separation of protein.

    Science.gov (United States)

    Liu, Yanjin; Wang, Yuzhi; Dai, Qingzhou; Zhou, Yigang

    2016-09-14

    A novel and facile magnetic deep eutectic solvents (DES) molecularly imprinted polymers (MIPs) for the selective recognition and separation of Bovine hemoglobin (BHb) was prepared. The new-type DES was adopted as the functional monomer which would bring molecular imprinted technology to a new direction. The amounts of DES were optimized. The obtained magnetic DES-MIPs were characterized with fourier transform infrared spectrometry (FT-IR), thermogravimetric analysis (TGA), field emission scanning electron microscope (FESEM), dynamic light scattering (DLS), elemental analysis and vibrating sample magnetometer (VSM). The results suggested that the imprinted polymers were successfully formed and possessed a charming magnetism. The maximum adsorption capability (Qmax) and dissociation constant (KL) were analyzed by Langmuir isotherms (R(2) = 0.9983) and the value were estimated to be 175.44 mg/g and 0.035 mg/mL for the imprinted particles. And the imprinted particles showed a high imprinting factor of 4.77. In addition, the magnetic DES-MIPs presented outstanding recognition specificity and selectivity so that it can be utilized to separate template protein from the mixture of proteins and real samples. Last but not least, the combination of deep eutectic solvents and molecular imprinted technology in this paper provides a new perspective for the recognition and separation of proteins. PMID:27566352

  11. On-chip micro-electromagnets for magnetic-based bio-molecules separation

    Energy Technology Data Exchange (ETDEWEB)

    Ramadan, Qasem E-mail: qasem@pmail.ntu.edu.sg; Samper, Victor; Poenar, Daniel; Yu Chen

    2004-10-01

    This paper reports a comprehensive theoretical, finite element and measurement analysis of different designs of planar micro-electromagnets for bio-molecular manipulation. The magnetic field due to current flowing in complex shapes of current-carrying conductors have been calculated analytically, simulated using finite-element analysis (FEA), and measured using the superconducting quantum interference device technique (SQUID). A comparison of the theoretical and measured magnetic field strength and patterns is presented. The planar electromagnets have been fabricated using patterned Al 2 {mu}m thick. The aim of the study is to explore and optimize the geometrical and structural parameters of planar electromagnets that give rise to the highest magnetic fields and forces for magnetic micro-beads manipulation. Magnetic beads are often used in biochemical assays for separation of bio-molecules. Typical beads are 0.2-10 {mu}m in diameter and have superparamagnetic properties. Increasing the intensity of the magnetic field generated by a coil by injection a larger current is not the most suitable solution as the maximum current is limited by Joule heating. Consequently, in order to maximize the field for a given current, one should optimize the geometry of the coil, as this is an extremely significant factor in determining the magnetic field intensity in 2D planar designs. The theoretical and measured results of this work show that the meander micro-electromagnet with mesh-shaped winding profile produces the strongest magnetic field (about 2.7 {mu}T for a current intensity of 6 mA) compared with other meander designs, such as the serpentine and rosette-shaped ones. The magnetic fields of these three types of meander-shaped micro-electromagnets were compared theoretically with that produced by a spiral micro-electromagnet whose technological realization is more complicated and costly due to the fact that it requires an additional insulation layer with a contact window and

  12. Separation of image-distortion sources and magnetic-field measurement in scanning electron microscope (SEM).

    Science.gov (United States)

    Płuska, Mariusz; Czerwinski, Andrzej; Ratajczak, Jacek; Katcki, Jerzy; Oskwarek, Lukasz; Rak, Remigiusz

    2009-01-01

    The electron-microscope image distortion generated by electromagnetic interference (EMI) is an important problem for accurate imaging in scanning electron microscopy (SEM). Available commercial solutions to this problem utilize sophisticated hardware for EMI detection and compensation. Their efficiency depends on the complexity of distortions influence on SEM system. Selection of a proper method for reduction of the distortions is crucial. The current investigations allowed for a separation of the distortions impact on several components of SEM system. A sum of signals from distortion sources causes wavy deformations of specimen shapes in SEM images. The separation of various reasons of the distortion is based on measurements of the periodic deformations of the images for different electron beam energies and working distances between the microscope final aperture and the specimen. Using the SEM images, a direct influence of alternating magnetic field on the electron beam was distinguished. Distortions of electric signals in the scanning block of SEM were also separated. The presented method separates the direct magnetic field influence on the electron beam below the SEM final aperture (in the chamber) from its influence above this aperture (in the electron column). It also allows for the measurement of magnetic field present inside the SEM chamber. The current investigations gave practical guidelines for selecting the most efficient solution for reduction of the distortions.

  13. Challenge to the volume reduction of contaminated soil based on magnetic separation

    International Nuclear Information System (INIS)

    A great amount of radioactive substances were released in the neighborhood of Fukushima Daiichi Nuclear Power Station following the accident of this plant. In particular, damage from radioactive cesium (134 or 137) has become the main case of trouble, incurring the necessity of decontamination of soil in the contaminated territory. In addition, a large amount of contaminated soil was generated due to the decontamination work, and its volume reduction has become a large challenge for the management and storage. This paper takes up magnetic separation technology as one of the technologies of volume reduction, and introduces its development condition. In this method, soil is firstly classified by size, and clay (or silt) with small particles, which adsorbs about 80% of radioactive cesium in soil, is separated from sand gravel. Furthermore, this clay portion is separated based on magnetic separation to 1:1 type and 1:2 type clay minerals with different magnetic susceptibilities, for the purpose of volume reduction. This paper describes the principle of the above method, as well as the development history to date. (A.O.)

  14. Haloing in bimodal magnetic colloids: The role of field-induced phase separation

    Science.gov (United States)

    Magnet, C.; Kuzhir, P.; Bossis, G.; Meunier, A.; Suloeva, L.; Zubarev, A.

    2012-07-01

    If a suspension of magnetic micrometer-sized and nanosized particles is subjected to a homogeneous magnetic field, the nanoparticles are attracted to the microparticles and form thick anisotropic halos (clouds) around them. Such clouds can hinder the approach of microparticles and result in effective repulsion between them [M. T. López-López, A. Yu. Zubarev, and G. Bossis, Soft Matter10.1039/c0sm00261e 6, 4346 (2010)]. In this paper, we present detailed experimental and theoretical studies of nanoparticle concentration profiles and of the equilibrium shapes of nanoparticle clouds around a single magnetized microsphere, taking into account interactions between nanoparticles. We show that at a strong enough magnetic field, the ensemble of nanoparticles experiences a gas-liquid phase transition such that a dense liquid phase is condensed around the magnetic poles of a microsphere while a dilute gas phase occupies the rest of the suspension volume. Nanoparticle accumulation around a microsphere is governed by two dimensionless parameters—the initial nanoparticle concentration (φ0) and the magnetic-to-thermal energy ratio (α)—and the three accumulation regimes are mapped onto a α-φ0 phase diagram. Our local thermodynamic equilibrium approach gives a semiquantitative agreement with the experiments on the equilibrium shapes of nanoparticle clouds. The results of this work could be useful for the development of the bimodal magnetorheological fluids and of the magnetic separation technologies used in bioanalysis and water purification systems.

  15. Removal of malaria-infected red blood cells using magnetic cell separators: A computational study.

    Science.gov (United States)

    Kim, Jeongho; Massoudi, Mehrdad; Antaki, James F; Gandini, Alberto

    2012-02-15

    High gradient magnetic field separators have been widely used in a variety of biological applications. Recently, the use of magnetic separators to remove malaria-infected red blood cells (pRBCs) from blood circulation in patients with severe malaria has been proposed in a dialysis-like treatment. The capture efficiency of this process depends on many interrelated design variables and constraints such as magnetic pole array pitch, chamber height, and flow rate. In this paper, we model the malaria-infected RBCs (pRBCs) as paramagnetic particles suspended in a Newtonian fluid. Trajectories of the infected cells are numerically calculated inside a micro-channel exposed to a periodic magnetic field gradient. First-order stiff ordinary differential equations (ODEs) governing the trajectory of particles under periodic magnetic fields due to an array of wires are solved numerically using the 1(st) -5(th) order adaptive step Runge-Kutta solver. The numerical experiments show that in order to achieve a capture efficiency of 99% for the pRBCs it is required to have a longer length than 80 mm; this implies that in principle, using optimization techniques the length could be adjusted, i.e., shortened to achieve 99% capture efficiency of the pRBCs. PMID:22345827

  16. Review and evaluation of extractants for strontium removal using magnetically assisted chemical separation

    Energy Technology Data Exchange (ETDEWEB)

    Bauer, C.B.; Rogers, R.D. [Northern Illinois Univ., De Kalb, IL (United States). Dept. of Chemistry; Nunez, L.; Ziemer, M.D.; Pleune, T.T.; Vandegrift, G.F. [Argonne National Lab., IL (United States)

    1995-11-01

    A literature review on extractants for strontium removal was initially performed at Northern Illinois University to assess their potential in magnetically assisted chemical separation. A series of potential strontium extractants was systematically evaluated there using radioanalytical methods. Initial experiments were designed to test the uptake of strontium from nitric acid using several samples of magnetic extractant particles that were coated with various crown ether ligands. High partition coefficient (K{sub d}) values for stimulant tank waste were obtained. Further studies demonstrated that the large partitioning was due to uncoated particles.

  17. High gradient magnetic separation versus expanded bed adsorption: a first principle comparison

    DEFF Research Database (Denmark)

    Hubbuch, Jürgen; Matthiesen, D.B.; Hobley, Timothy John;

    2001-01-01

    system exhibited substantially enhanced productivity over expanded bed adsorption when operated at processing velocities greater than 48 m h(-1). Use of the bacitracin- linked magnetic supports for a single cycle of batch adsorption and subsequent capture by high gradient magnetic separation...... at a processing rate of 12 m h(-1) resulted in a 2.2-fold higher productivity relative to expanded bed adsorption, while an increase in adsorbent collection rate to 72 m h(-1) raised the productivity to 10.7 times that of expanded bed adsorption. When the number of batch adsorption cycles was then increased...

  18. 浅析聚磁介质在磁选机中的应用%Analysis on the Assembled Magnetic Media Application in the Magnetic Separator

    Institute of Scientific and Technical Information of China (English)

    赵礼兵; 张玉栋; 李富平

    2012-01-01

    高梯度磁选机是在其他强磁选机的基础上发展起来的一种新型强磁选机.通过整个高梯度磁选机工作体积的磁化场是均匀的,即工作体积中的任何一个颗粒受到的力相同,且磁化场中的磁介质被均匀磁化,同直径的磁介质在磁化空间的任何位置,其梯度的数量级是相同的,与一般磁选机相比较,磁场梯度大大提高,从而为磁性颗粒的选别提供强大的磁力克服流体阻力和重力,使微细粒弱磁性颗粒可以得到有效的回收.高梯度磁选是在能产生高梯度的聚磁介质上进行的,而高梯度的产生与聚磁介质的材质、形状、放置方式、相对尺寸及充填率等参数有密切关系,对磁选机的磁选指标有较大的影响.%High gradient magnetic separator is a new type high-intensity magnetic separator which was developed on the basis of other strong magnetic separator. The magnetic field in the working volume of the high gradient magnetic separator is uniform, which means that any particles was subjected to equal force in the working volume, and the magnetic medium was uniform magnetization in uniform magnetic field. The magnetic medium with the same diameter in any postion of the magnetic space has the same gradient magnitude, ompared with general magnetic separator, the magnetic field gradient was greatly increased t which could provide a powerful magnetic force to overcome the fluid resistance and gravity for sorting of magnetic particles,so that the micro-fine weak-intensity magnetic particles can be effectively recycled. The high gradient magnetic separation is conducted in the magnetic matrices which can produce high gradient,and the generation of the high gradient has a close relation with the material,shape,the way of placement,relative size,filling rate and other parameters of the magnetic matrices,which have a significant influence on the magnetic separation index of the magnetic separator.

  19. Development and creation of the electromagnetic separator for isotope separation in the system of opposing axisymmetric magnetic fields with two fields reversed

    International Nuclear Information System (INIS)

    The paper reports the results of work on creation of a setup for isotope separation in the system of opposing axisymmetric magnetic fields with two field reverses. Consideration is given to a real possibility of improving the efficiency of the electromagnetic separator and its resolving power in the double-reverse magnetic field system. It is demonstrated that the use of the opposing axisymmetric field system may substantially reduce the energy consumption during the process of isotope separation. The estimated magnetic field of the facility attests to a possibility of molybdenum isotope separation and isolation of high-purity 98Mo and 100Mo isotopes required for production of the 99Mo/99Tc generator, most widely used in modern medicine.

  20. Electric arc furnace dust treatment: investigation on mechanical and magnetic separation methods.

    Science.gov (United States)

    Sekula, R; Wnek, M; Selinger, A; Wróbel, M

    2001-08-01

    Electric arc furnace dust (EAFD) is a major issue for processing technologies: Several million tons per year are generated, it contains both valuable and hazardous metals and yet no available treatment process has proven to be superior to all others. Processes currently applied or being developed are either of hydro- or pyrometallurgical type, which are very costly. In the paper testing of some physical separation methods of electric arc furnace dust from Polish steel industry were investigated. SEM, EDX analyses as well as grain size observations of dust particles were additionally performed. All investigations confirmed a possibility of effective magnetic and mechanical separation of EAFD particles.

  1. A water-fat separation imaging method for the brain on low field magnetic resonance imaging

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Water-fat separation is a particularly important problem for magnetic resonance imaging.Although many methods have been proposed,the reliability is still challenging.In this work,we have presented a method based on the combination of the branch-cut method and multigrid algorithm to get a more robust performance of water-fat separation.First,the branch-cut method is applied to identify residues,which violates the requirement that the interacting phase gradient around a closed path be zero.Residues and branch...

  2. Magnetic antibody immunoassay (MAIA) - a new improved separation technique in radioimmunoassay

    International Nuclear Information System (INIS)

    Following a short description of the principle of radioimmunoassay and immunoradiometric assay, the special difficulties connected with the separation steps are discussed. Centrifugation is subject to inaccuracies and both time-consuming and technically complicated. Moreover it involves the risk of microbial or radioactive contamination. A new solid-phase procedure is presented using magnetizable particles as solid phase which are for instance bonded with the antibody. Separation is effected by collection of the magnetizable particles and the attached antibodies using a permanent magnet and subsequent decanting of the supernatant. The method is explained using two examples (cortisol, digoxin). (ZDE)

  3. Characterization of steel grit recovered from ornamental rocks waste by magnetic separation; Caracterizacao da granalha de aco recuperada do residuo de rochas ornamentais por separacao magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Junca, E.; Telles, V.B.; Rodrigues, G.F.; Oliveira, J.R. de; Tenorio, J.A.S., E-mail: eduardojunca@gmail.co [Universidade de Sao Paulo (USP), SP (Brazil). Dept. de Engenharia Metalurgica e de Materiais; Instituto Federal de Ciencia e Tecnologia do Espirito Santo (IFES), Vitoria, ES (Brazil)

    2010-07-01

    The aim of this work is characterization of steel grit recovered from ornamental rock waste by magnetic separation. The magnetic separation was realized in three steps: first, using a high intensity wet magnetic separator, which used only the remaining magnetic field of equipment. In the second step, the magnetic material obtained in the first phase was subjected to a new manual magnetic separation using rare earth magnets. In a third step, magnetic material obtained with rare earth magnets was subjected to manual magnetic separation using ferrite magnets. After the magnetic separation, the material was sent to characterization which was obtained by chemical analysis, scanning electron microscopy, X-ray diffraction and size analysis. The size analysis showed that the concentrate range from 0,5 to 563,67 {mu}m with 4 wt.% over 100 {mu}m and content metallic iron of 93 wt%. (author)

  4. Magnetic anisotropy and anisotropic magnetoresistance in strongly phase separated manganite thin films

    Science.gov (United States)

    Kandpal, Lalit M.; Singh, Sandeep; Kumar, Pawan; Siwach, P. K.; Gupta, Anurag; Awana, V. P. S.; Singh, H. K.

    2016-06-01

    The present study reports the impact of magnetic anisotropy (MA) on magnetotransport properties such as the magnetic transitions, magnetic liquid behavior, glass transition and anisotropic magnetoresistance (AMR) in epitaxial film (thickness 42 nm) of strongly phase separated manganite La5/8-yPryCa3/8MnO3 (y≈0.4). Angle dependent magnetization measurement confirms the out-of-plane magnetic anisotropy with the magnetic easy axes aligned in the plane of the film and the magnetic hard axis along the normal to the film plane. The more prominent divergence between the zero filed cooled (ZFC) and field cooled warming (FCW) and the stronger hysteresis between the field cooled cooling (FCC) and FCW magnetization for H ∥ shows the weakening of the magnetic liquid along the magnetic hard axis. The peak at Tp≈42 K in FCW magnetization, which characterizes the onset of spin freezing shifts down to Tp≈18 K as the field direction is switched from the easy axes (H ∥) to the hard axis (H ⊥). The glass transition, which appears at Tg≈28 K for H ∥ disappears for H ⊥. The easy axis magnetization (M∣∣) appears to saturate around H~20 kOe, but the hard axis counterpart (M⊥) does not show such tendency even up to H=50 kOe. MA appears well above the ferromagnetic (FM) transition at T≈170 K, which is nearly the same as the Neel temperature (TN) of M⊥ - T . The temperature dependent resistivity measured at H=10 kOe applied along the easy axis (ρ|| - T) and the hard axis (ρ⊥ - T) shows insulator metal transition (IMT) at ≈106 K and ≈99 K in the cooling cycle, respectively. The large difference between ρ⊥ - T and ρ|| - T during the cooling cycle and in the vicinity of IMT results in huge AMR of ≈-142% and -115%. The observed properties have been explained in terms of the MA induced variation in the relative fraction of the coexisting magnetic phases.

  5. Separated Eutectic Structure of Al-11 wt pct Si Alloy under Direct Magnetic Field

    Institute of Scientific and Technical Information of China (English)

    Yan WANG; Jiang JIANG; Zhonghua ZHANG; Xiufang BIAN

    2001-01-01

    An investigation has been made on the effect of a direct magnetic field on the structure of eutectic Al-11 wt pct Si alloy. At the superheated temperature of 750℃, a separated eutectic structure in the alloy occurs under the condition of the magnetic induction intensity up to 0.24 T. A great number of primary Si particles in the Al-11 wt pct Si alloy are segregated to the surface layer of the specimens. The microstructure of the alloy consists of primary Si particles in the surface layer and Al matrix in the inner part of the specimen. Moreover, the higher the superheated temperature, the more remarkable the segregation trend. The mechanism of the formation of separated eutectic has been discussed.

  6. Developments in magnet modeling and beam optics for the ARIS separator at FRIB

    Science.gov (United States)

    Portillo, M.; Hausmann, M.; Chouhan, S.

    2016-06-01

    A description is given on the methods used for field analysis of magnets and the extracted parameters used for accurate beam simulations of the fragment separator. For the strong focusing magnets, Fourier decomposition is used in order to extract induced fields associated with higher order multipoles. For dipoles, a 2D field map model is used instead in order to emulate complex field distributions. The theory of the models and the techniques chosen are described, along with results from Monte Carlo beam simulations up to 5th order. The n = 6 multipole induced by the quadrupole is the most significant component. The effects on separator performance with and without this component in the model are demonstrated.

  7. Preparation of Metallic Iron Powder from Pyrite Cinder by Carbothermic Reduction and Magnetic Separation

    Directory of Open Access Journals (Sweden)

    Hongming Long

    2016-04-01

    Full Text Available The reduction and magnetic separation procedure of pyrite cinder in the presence of a borax additive was performed for the preparation of reduced powder. The effects of borax dosage, reduction temperature, reduction time and grinding fineness were investigated. The results show that when pyrite cinder briquettes with 5% borax were pre-oxidized at 1050 °C for 10 min, and reduced at 1050 °C for 80 min, with the grinding fineness (<0.44 mm passing 81%, the iron recovery was 91.71% and the iron grade of the magnetic concentrate was 92.98%. In addition, the microstructures of the products were analyzed by optical microscope, scanning electron microscope (SEM, and mineralography, and the products were also studied by the X-ray powder diffraction technique (XRD to investigate the mechanism; the results show that the borax additive was approved as a good additive to improve the separation of iron and gangue.

  8. Tailored functionalization of iron oxide nanoparticles for MRI, drug delivery, magnetic separation and immobilization of biosubstances.

    Science.gov (United States)

    Hola, Katerina; Markova, Zdenka; Zoppellaro, Giorgio; Tucek, Jiri; Zboril, Radek

    2015-11-01

    In this critical review, we outline various covalent and non-covalent approaches for the functionalization of iron oxide nanoparticles (IONPs). Tuning the surface chemistry and design of magnetic nanoparticles are described in relation to their applicability in advanced medical technologies and biotechnologies including magnetic resonance imaging (MRI) contrast agents, targeted drug delivery, magnetic separations and immobilizations of proteins, enzymes, antibodies, targeting agents and other biosubstances. We review synthetic strategies for the controlled preparation of IONPs modified with frequently used functional groups including amine, carboxyl and hydroxyl groups as well as the preparation of IONPs functionalized with other species, e.g., epoxy, thiol, alkane, azide, and alkyne groups. Three main coupling strategies for linking IONPs with active agents are presented: (i) chemical modification of amine groups on the surface of IONPs, (ii) chemical modification of bioactive substances (e.g. with fluorescent dyes), and (iii) the activation of carboxyl groups mainly for enzyme immobilization. Applications for drug delivery using click chemistry linking or biodegradable bonds are compared to non-covalent methods based on polymer modified condensed magnetic nanoclusters. Among many challenges, we highlight the specific surface engineering allowing both therapeutic and diagnostic applications (theranostics) of IONPs and magnetic/metallic hybrid nanostructures possessing a huge potential in biocatalysis, green chemistry, magnetic bioseparations and bioimaging.

  9. Tailored functionalization of iron oxide nanoparticles for MRI, drug delivery, magnetic separation and immobilization of biosubstances.

    Science.gov (United States)

    Hola, Katerina; Markova, Zdenka; Zoppellaro, Giorgio; Tucek, Jiri; Zboril, Radek

    2015-11-01

    In this critical review, we outline various covalent and non-covalent approaches for the functionalization of iron oxide nanoparticles (IONPs). Tuning the surface chemistry and design of magnetic nanoparticles are described in relation to their applicability in advanced medical technologies and biotechnologies including magnetic resonance imaging (MRI) contrast agents, targeted drug delivery, magnetic separations and immobilizations of proteins, enzymes, antibodies, targeting agents and other biosubstances. We review synthetic strategies for the controlled preparation of IONPs modified with frequently used functional groups including amine, carboxyl and hydroxyl groups as well as the preparation of IONPs functionalized with other species, e.g., epoxy, thiol, alkane, azide, and alkyne groups. Three main coupling strategies for linking IONPs with active agents are presented: (i) chemical modification of amine groups on the surface of IONPs, (ii) chemical modification of bioactive substances (e.g. with fluorescent dyes), and (iii) the activation of carboxyl groups mainly for enzyme immobilization. Applications for drug delivery using click chemistry linking or biodegradable bonds are compared to non-covalent methods based on polymer modified condensed magnetic nanoclusters. Among many challenges, we highlight the specific surface engineering allowing both therapeutic and diagnostic applications (theranostics) of IONPs and magnetic/metallic hybrid nanostructures possessing a huge potential in biocatalysis, green chemistry, magnetic bioseparations and bioimaging. PMID:25689073

  10. Magnetically Separable Base Catalysts: Heterogeneous Catalysis vs. Quasi-Homogeneous Catalysis

    OpenAIRE

    Raed Abu-Reziq; Howard Alper

    2012-01-01

    The synthesis of magnetically separable quasi-homogeneous base catalyst and heterogeneous base catalyst is described. The quasi-homogeneous catalyst is achieved by supporting silane monomers functionalized with different amine groups directly on the surface of magnetite nanoparticles. The heterogeneous catalyst is prepared via a sol-gel process in which silane monomers containing different amine groups are copolymerized with tetraethoxysilane in the presence of magnetite nanoparticles functio...

  11. Design of microfluidic channels for magnetic separation of malaria-infected red blood cells

    Science.gov (United States)

    Wu, Wei-Tao; Martin, Andrea Blue; Gandini, Alberto; Aubry, Nadine; Massoudi, Mehrdad; Antaki, James F.

    2016-01-01

    This study is motivated by the development of a blood cell filtration device for removal of malaria-infected, parasitized red blood cells (pRBCs). The blood was modeled as a multi-component fluid using the computational fluid dynamics discrete element method (CFD-DEM), wherein plasma was treated as a Newtonian fluid and the red blood cells (RBCs) were modeled as soft-sphere solid particles which move under the influence of drag, collisions with other RBCs, and a magnetic force. The CFD-DEM model was first validated by a comparison with experimental data from Han et al. 2006 (Han and Frazier 2006) involving a microfluidic magnetophoretic separator for paramagnetic deoxygenated blood cells. The computational model was then applied to a parametric study of a parallel-plate separator having hematocrit of 40% with a 10% of the RBCs as pRBCs. Specifically, we investigated the hypothesis of introducing an upstream constriction to the channel to divert the magnetic cells within the near-wall layer where the magnetic force is greatest. Simulations compared the efficacy of various geometries upon the stratification efficiency of the pRBCs. For a channel with nominal height of 100 µm, the addition of an upstream constriction of 80% improved the proportion of pRBCs retained adjacent to the magnetic wall (separation efficiency) by almost 2 fold, from 26% to 49%. Further addition of a downstream diffuser reduced remixing, hence improved separation efficiency to 72%. The constriction introduced a greater pressure drop (from 17 to 495 Pa), which should be considered when scaling-up this design for a clinical-sized system. Overall, the advantages of this design include its ability to accommodate physiological hematocrit and high throughput – which is critical for clinical implementation as a blood-filtration system.

  12. Superconducting magnet system of in-flight separator for a heavy ion accelerator planned in Korea

    Energy Technology Data Exchange (ETDEWEB)

    Kim, J. W.; Kim, D. G.; Jo, H. C. [Institute for Basic Science, Daejeon (Korea, Republic of); Choi, Y. S. [Korea Basic Science Institute, Daejeon (Korea, Republic of); Kim, S. H. [Changwon National University, Changwon (Korea, Republic of); Sim, K. D.; Sohn, M. H. [Korea Electrotechnology Research Institute, Changwon (Korea, Republic of)

    2015-03-15

    An in-flight fragment separator, which aims to produce and study rare isotopes, consists of superferric quadrupole triplets and dipole magnets to focus and bend the beams for achromatic focusing and momentum dispersion, respectively. The separator is divided into pre and main stages, and we plan to use superconducting magnets employing high-Tc superconductor (HTS) coils in the pre-separator area, where radiation heating is high. The HTS coils will be cooled by cold He gas in 20-50 K, and in the other area, superferric magnets using low-temperature superconductor (LTS) will be used at 4 K. A few LTS coils were wound and successfully tested in a LHe dewar, and the design of cryostat has been optimized. Development of the HTS coils is ongoing in collaboration with a group at KERI. An HTS coil of racetrack shape was wound and tested in a bath and in a dewar with cryocooler. No degradation on critical current due to coil winding was found.

  13. Separation of ferromagnetic components by analyzing the hysteresis loops of remanent magnetization

    Science.gov (United States)

    Kosareva, L. R.; Utemov, E. V.; Nurgaliev, D. K.; Shcherbakov, V. P.; Kosarev, V. E.; Yasonov, P. G.

    2015-09-01

    The new method is suggested for separating ferromagnetic components in sediments through analyzing the coercivity spectra of the samples by the continuous wavelet transform with the Gaussian-based wavelet (MHAT). A total of 1056 samples of Lake Khuvsgul's sediments (Mongolia) are studied. At least four groups of magnetic components are identified based on the analysis of their magnetization and remagnetization curves. Almost all samples are found to contain two components of bacterial origin which are represented by the assemblages of the interacting single-domain grains and differ by the grain compositions (magnetite and greigite). The applicability of the magnetic data for diagnosing magnetotactic bacteria in sediments and building paleoecological and paleoclimatic reconstructions is demonstrated.

  14. Temperature-Switchable Agglomeration of Magnetic Particles Designed for Continuous Separation Processes in Biotechnology.

    Science.gov (United States)

    Paulus, Anja S; Heinzler, Raphael; Ooi, Huey Wen; Franzreb, Matthias

    2015-07-01

    The purpose of this work was the synthesis and characterization of thermally switchable magnetic particles for use in biotechnological applications such as protein purification and enzymatic conversions. Reversible addition-fragmentation chain-transfer polymerization was employed to synthesize poly(N-isopropylacrylamide) brushes via a "graft-from" approach on the surface of magnetic microparticles. The resulting particles were characterized by infrared spectroscopy and thermogravimetric analysis and their temperature-dependent agglomeration behavior was assessed. The influence of several factors on particle agglomeration (pH, temperature, salt type, and particle concentration) was evaluated. The results showed that a low pH value (pH 3-4), a kosmotropic salt (ammonium sulfate), and a high particle concentration (4 g/L) resulted in improved agglomeration at elevated temperature (40 °C). Recycling of particles and reversibility of the temperature-switchable agglomeration were successfully demonstrated for ten heating-cooling cycles. Additionally, enhanced magnetic separation was observed for the modified particles. Ionic monomers were integrated into the polymer chain to create end-group functionalized particles as well as two- and three-block copolymer particles for protein binding. The adsorption of lactoferrin, bovine serum albumin, and lysozyme to these ion exchange particles was evaluated and showed a binding capacity of up to 135 mg/g. The dual-responsive particles combined magnetic and thermoresponsive properties for switchable agglomeration, easy separability, and efficient protein adsorption.

  15. Preconcentration and separation of ultra-trace beryllium using quinalizarine-modified magnetic microparticles

    Energy Technology Data Exchange (ETDEWEB)

    Ashtari, Parviz, E-mail: pashtari@aeoi.org.ir [State Key Laboratory of Chemo/Biosensing and Chemometrics, Biomedical Engineering Center, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China); NFCS, Nuclear Science and Technology Research Institute, PO Box 11365-8486, Tehran (Iran, Islamic Republic of); Wang Kemin; Yang Xiaohai [State Key Laboratory of Chemo/Biosensing and Chemometrics, Biomedical Engineering Center, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China); Ahmadi, Seyed Javad [NFCS, Nuclear Science and Technology Research Institute, PO Box 11365-8486, Tehran (Iran, Islamic Republic of)

    2009-07-30

    Magnetically-assisted chemical separation/preconcentration method for the analysis of beryllium from aqueous solutions was developed. According to this method several extractants were coated on certain magnetic microparticles to assist the extraction of beryllium from the aqueous solutions. The influence of different parameters (type and amount of extractant, pH, equilibrium time and ionic strength) was investigated. Also, the interfering effect of various cationic and anionic species on the percent recovery of beryllium was studied. The applied spectrophotometric method showed good linearity and precision at a given wavelength (605.0 nm). Among the extractants used, quinalizarine resulted in almost a full recovery of beryllium at pH 7.4, which was the optimum extraction pH. The equilibrium time of the extraction was 10.0 min. The quantitative re-extraction was carried out by 0.5 M nitric acid. Also, the stability of the extractant-coated magnetic microparticles was 4 cycles (extraction and re-extraction) and the used magnetic microparticles showed good selectivity for beryllium against other cations and anions. Finally, the developed method was applicable for the preconcentration and separation of beryllium from spring water, tap water and certified reference waters. The obtained detection limit was 30 ng L{sup -1}.

  16. Recovery of iron from vanadium tailings with coal-based direct reduction followed by magnetic separation

    Energy Technology Data Exchange (ETDEWEB)

    Yang Huifen, E-mail: yanghf@ustb.edu.cn [Key Laboratory for High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083 (China); Jing Lili [Key Laboratory for High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083 (China); Zhang Baogang [Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871 (China)

    2011-01-30

    A technique with coal-based direct reduction followed by magnetic separation is presented in this study for recovering and reusing iron otherwise wasted in vanadium tailings. Process parameters such as usage of additives, tailings/reductant/additives ratio, reduction temperature and time, as well as particle size were experimentally determined. The optimum process parameters were proposed as follows: using lime as the additive, lignite as the reductant, weight ratios of vanadium tailings/lignite/lime at 100:30:10, reduction roasting at 1200 deg. C for 60 min, and particle size of 98% less than 30 {mu}m in the final roasted product feeding to magnetic separation. Under these conditions, a magnetic concentrate containing 90.31% total iron and 89.76% metallization iron with a total iron recovery rate of 83.88% was obtained. In addition, mineralography of vanadium tailings, coal-based reduction product and magnetic concentrate were studied by X-ray powder diffraction technique (XRD). The microstructures of above products were analyzed by scanning electron microscope (SEM) to help understand the mechanism.

  17. Conjugates of Magnetic Nanoparticle -- Actinide Specific Chelator for Radioactive Waste Separation

    Energy Technology Data Exchange (ETDEWEB)

    Maninder Kaur; Huijin Zhang; Leigh Martin; Terry Todd; You Qiang

    2013-11-01

    A novel nanotechnology for the separation of radioactive waste that uses magnetic nanoparticles (MNPs) conjugated with actinide specific chelators (MNP-Che) is reviewed with a focus on design and process development. The MNP-Che separation process is an effective way of separating heat generating minor actinides (Np, Am, Cm) from spent nuclear fuel solution to reduce the radiological hazard. It utilizes coated MNPs to selectively adsorb the contaminants onto their surfaces, after which the loaded particles are collected using a magnetic field. The MNP-Che conjugates can be recycled by stripping contaminates into a separate, smaller volume of solution, and then become the final waste form for disposal after reusing number of times. Due to the highly selective chelators, this remediation method could be both simple and versatile while allowing the valuable actinides to be recovered and recycled. Key issues standing in the way of large-scale application are stability of the conjugates and their dispersion in solution to maintain their unique properties, especially large surface area, of MNPs. With substantial research progress made on MNPs and their surface functionalization, as well as development of environmentally benign chelators, this method could become very flexible and cost-effective for recycling used fuel. Finally, the development of this nanotechnology is summarized and its future direction is discussed.

  18. Conjugates of magnetic nanoparticle-actinide specific chelator for radioactive waste separation.

    Science.gov (United States)

    Kaur, Maninder; Zhang, Huijin; Martin, Leigh; Todd, Terry; Qiang, You

    2013-01-01

    A novel nanotechnology for the separation of radioactive waste that uses magnetic nanoparticles (MNPs) conjugated with actinide specific chelators (MNP-Che) is reviewed with a focus on design and process development. The MNP-Che separation process is an effective way of separating heat generating minor actinides (Np, Am, Cm) from spent nuclear fuel solution to reduce the radiological hazard. It utilizes coated MNPs to selectively adsorb the contaminants onto their surfaces, after which the loaded particles are collected using a magnetic field. The MNP-Che conjugates can be recycled by stripping contaminates into a separate, smaller volume of solution, and then become the final waste form for disposal after reusing number of times. Due to the highly selective chelators, this remediation method could be both simple and versatile while allowing the valuable actinides to be recovered and recycled. Key issues standing in the way of large-scale application are stability of the conjugates and their dispersion in solution to maintain their unique properties, especially large surface area, of MNPs. With substantial research progress made on MNPs and their surface functionalization, as well as development of environmentally benign chelators, this method could become very flexible and cost-effective for recycling used fuel. Finally, the development of this nanotechnology is summarized and its future direction is discussed. PMID:24070142

  19. Carboxyl modified magnetic nanoparticles coated open tubular column for capillary electrochromatographic separation of biomolecules.

    Science.gov (United States)

    Wang, Wentao; Xiao, Xing; Chen, Jia; Jia, Li

    2015-09-11

    Carboxyl modified magnetic nanoparticles (Fe3O4-COOH MNPs) coated open tubular (OT) columns were prepared for capillary electrochromatography. The Fe3O4-COOH MNPs coatings were constructed on the surface of positively charged poly(diallydimethylammonium chloride) (PDDA) modified capillaries through electrostatic self-assembly approach. The as-prepared PDDA@Fe3O4-COOH MNPs coated OT columns were characterized by scanning electron microscopy and electroosmotic flow measurement. The electrochromatographic characterization of the OT columns was evaluated by separation of amino acids, dipeptides and proteins. The influences of background solution pH, concentration, and organic modifier content on separation were investigated. The separation of these analytes was primarily based on the electrophoretic mechanism in combination with chromatographic mechanism. The Fe3O4-COOH MNPs coatings improved the separation resolution of these analytes due to their large surface area. Three variants of bovine serum albumin, two variants of β-lactoglobulin and nine glycoisoforms of ovalbumin were successfully separated. The relative standard deviations of migration times of analytes representing run-to-run, day-to-day and column-to-column were less than 4.3%. Furthermore, the feasibility of the PDDA@Fe3O4-COOH MNPs coated OT column was verified by successful separation of acidic proteins in egg white. PMID:26265004

  20. The gas-filled magnet: An isobar separator for accelerator mass spectrometry

    International Nuclear Information System (INIS)

    The most difficult problem for accelerator mass spectrometry is the rejection of stable atomic isobars. The intensity of isobaric interference is expected to become a problem for 36Cl measurements with the use of new high-intensity ion sources. Although better chemical separation may be possible through improved sample preparation, the device expected to help most with this problem is the gas-filled magnet. We tested a gas-filled Enge split-pole spectrograph combined with a multi-plate gas ionization detector for the separation of 36S from 36Cl and obtained an isobar separation of about two orders of magnitude better than that possible with the detector alone. 10 refs., 3 figs., 1 tab

  1. A water-fat separation imaging method for the brain on low field magnetic resonance imaging

    Institute of Scientific and Technical Information of China (English)

    Hong-jun Tian; Si-ping Chen; Tian-fu Wang; Xian-fen Diao; Chong-xun Zheng

    2009-01-01

    Water-fat separation is a particularly important problem for magnetic resonance imaging. Although many methods have been proposed, the reliability is still challenging. In this work, we have presented a method based on the combination of the branch-cut method and multigrid algorithm to get a more robust performance of water-fat separation. First, the branch-cut method is applied to identify residues, which violates the requirement that the interacting phase gradient around a closed path be zero. Residues and branches are marked to be zeros and filled to the weighting factor array. Then, the unwrapped phase array can be given by the multigrid algorithm. Finally, the Dixon method for water-fat separation is applied to the unwrapped phase array. Experiments for brain scanning on the 0.3T low field MRI system demonstrate the successful application of the proposed method.

  2. A ferrofluid guided system for the rapid separation of the non-magnetic particles in a microfluidic device.

    Science.gov (United States)

    Asmatulu, R; Zhang, B; Nuraje, N

    2010-10-01

    A microfluidic device was fabricated via UV lithography technique to separate non-magnetic fluoresbrite carboxy microspheres (approximately 4.5 microm) in the pH 7 ferrofluids made of magnetite nanoparticles (approximately 10 nm). A mixture of microspheres and ferrofluid was injected to a lithographically developed Y shape microfluidic device, and then by applying the external magnet fields (0.45 T), the microspheres were clearly separated into different channels because of the magnetic force acting on those non-magnetic particles. During this study, various pumping speeds and particle concentrations associated with the various distances between the magnet and the microfluidic device were investigated for an efficient separation. This study may be useful for the separation of biological particles, which are very sensitive to pH value of the solutions. PMID:21137734

  3. Application of a Halbach magnetic array for long-range cell and particle separations in biological samples

    Science.gov (United States)

    Kang, Joo H.; Driscoll, Harry; Super, Michael; Ingber, Donald E.

    2016-05-01

    Here, we describe a versatile application of a planar Halbach permanent magnet array for an efficient long-range magnetic separation of living cells and microparticles over distances up to 30 mm. A Halbach array was constructed from rectangular bar magnets using 3D-printed holders and compared to a conventional alternating array of identical magnets. We theoretically predicted the superiority of the Halbach array for a long-range magnetic separation and then experimentally validated that the Halbach configuration outperforms the alternating array for isolating magnetic microparticles or microparticle-bound bacterial cells at longer distances. Magnetophoretic velocities (ymag) of magnetic particles (7.9 μm diameter) induced by the Halbach array in a microfluidic device were significantly higher and extended over a larger area than those induced by the alternating magnet array (ymag = 178 versus 0 μm/s at 10 mm, respectively). When applied to 50 ml tubes (˜30 mm diameter), the Halbach array removed >95% of Staphylococcus aureus bacterial cells bound with 1 μm magnetic particles compared to ˜70% removed using the alternating array. In addition, the Halbach array enabled manipulation of 1 μm magnetic beads in a deep 96-well plate for ELISA applications, which was not possible with the conventional magnet arrays. Our analysis demonstrates the utility of the Halbach array for the future design of devices for high-throughput magnetic separations of cells, molecules, and toxins.

  4. Mineralogy and heavy metal leachability of magnetic fractions separated from some Chinese coal fly ashes

    International Nuclear Information System (INIS)

    Magnetic fractions (MFs) in fly ashes from eight coal-burning power plants were extracted by magnetic separation procedure. Their mineralogy and potential leachability of heavy metals were analyzed using rock magnetism, X-ray diffraction (XRD), scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM/EDX) and leaching procedures (toxicity characteristics leaching procedure by the United States Environmental Protection Agency, TCLP, and gastric juice simulation test, GJST). Results show that the MFs in the fly ashes range between 2.2 and 16.3 wt%, and are generally composed of magnetite, hematite, quartz and mullite. Thermomagnetic analysis and SEM/EDX indicate that the main magnetic carrier magnetite is substituted with small amounts of impure ions, and its structures are featured by rough, dendritic and granular iron spherules. The MFs are found to be rich in Fe, Mn, Cr, Cu, Cd and Pb. Compared with the non-magnetic fractions (NMFs), the MFs have about 5 times higher iron, and 1.6 times higher Mn, Cr, Cu and Cd concentrations. The TCLP test shows that the TCLP-extractable Cr, Cu, and Pb concentrations in the MFs are higher than those in the NMFs, while the TCLP-extractable Cd concentration in the MFs and NMFs is below the detection limit ( Cr > Pb > Cd. The heavy metals of fly ashes have a great potential to be released into the environment under acid environment.

  5. Nanomagnetism of Core-Shell Magnetic Nanoparticles and Application in Spent Nuclear Fuel Separation

    Science.gov (United States)

    Tarsem Singh, Maninder Kaur

    This dissertation presents the study on novel core-shell magnetic nanoparticles (NPs) with unique magnetic properties. Understanding the fundamental physics of antiferromagnetic - ferromagnetic interactions is essential to apply in different applications. Chromium (Cr) doped and undoped core-shell iron/iron-oxide NPs have been synthesized using cluster deposition system and studied with respect to their nanostructures, morphologies, sizes, chemical composition and magnetic properties. The room-temperature magnetic properties of Fe based NPs shows the strong dependence of intra/inter-particle interaction on NP size. The Cr-doped Fe NP shows the origin of sigma-FeCr phase at very low Cr concentration (2 at.%) unlike others reported at high Cr content and interaction reversal from dipolar to exchange interaction. A theoretical model of watermelon is constructed based on the experimental results and core-shell NP system in order to explain the physics of exchange interaction in Cr-doped Fe particles. The magnetic nanoparticle---chelator separation nanotechnology is investigated for spent nuclear fuel recycling and is reported 97% and 80% of extraction for Am(III) and Pu(IV) actinides respectively. If the long-term heat generating actinides such as Am(III) can be efficiently removed from the used fuel raffinates, the volume of material that can be placed in a given amount of repository space can be significantly increased. As it is a simple, versatile, compact, and cost efficient process that minimizes secondary waste and improves storage performance.

  6. Study of excess Fe metal in the lunar fines by magnetic separation, Moessbauer spectroscopy, and microscopic examination.

    Science.gov (United States)

    Housley, R. M.; Grant, R. W.; Abdel-Gawad, M.

    1972-01-01

    A simple and convenient method of making quantitative magnetic separations has been applied to the lunar fines. The fractions obtained form groups containing distinctively different particle types; thus, it appears that magnetic separation in itself many be a useful way of characterizing lunar fines. Moessbauer studies of fines 10084 show that the metal cannot contain more than about 1.5% Ni, implying that by far the bulk of the metal results from reduction rather than from direct meteoritic addition. Microscopic examination of magnetic separates from 15101 fines suggests that reduction of Fe accompanies every major impact event on the moon.

  7. Isotope production 98Mo and 100Mo electromagnetic separators on system axisymmetric magnetic fields with two reverse fields

    International Nuclear Information System (INIS)

    The paper demonstrates the possibility of separating 98Mo and 100Mo isotopes by means of the electromagnetic separator in the system of axially symmetric magnetic fields with two field reversals. The advantage of the method lies in the separation of the 100M o isotope in its pure form, without being contaminated with other isotopes. Of apparent interest is the proposed here method of increasing the productive capacity of the electromagnetic technique of isotope separation.

  8. Removal and recycle of phosphate from treated water of sewage plants with zirconium ferrite adsorbent by high gradient magnetic separation

    Energy Technology Data Exchange (ETDEWEB)

    Ito, D; Nishimura, K; Miura, O [Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397 (Japan)], E-mail: dai@eei.metro-u.ac.jp

    2009-03-01

    Zirconium ferrite particles are good adsorbent for phosphate ions. Magnetic separation characteristics for removal of phosphate from treated water of sewage plants with the adsorbent have been studied to prevent eutrophication of semi-enclosed bay, e.g. the bay of Tokyo. Based on the adsorption for the phosphate ions and ferromagnetic properties of the zirconium ferrite adsorbent, high gradient magnetic separation characteristics with using superconducting magnet was discussed. Very rapid magnetic filtration velocity, i.e. 1m/s, and regeneration properties of the adsorbent indicate that the zirconium ferrite is the excellent adsorbent for phosphorus removal and recycle from treated water of large scale sewage plants.

  9. Magnetic particle separation technique: a reliable and simple tool for RIA/IRMA and quantitative PCR assay

    International Nuclear Information System (INIS)

    Five types of magnetic particles without or with aldehyde, amino and carboxyl functional groups, respectively were used to immobilize first or second antibody by three models, i. e. physical adsorption, chemical coupling and immuno-affinity, forming four types of magnetic particle antibodies. The second antibody immobilized on polyacrolein magnetic particles through aldehyde functional groups and the first antibodies immobilized on carboxylic polystyrene magnetic particles through carboxyl functional groups were recommended to apply to RIAs and/or IRMAs. Streptavidin immobilized on commercial magnetic particles through amino functional groups was successfully applied to separating specific PCR product for quantification of human cytomegalovirus. In the paper typical data on reliability of these magnetic particle ligands were reported and simplicity of the magnetic particle separation technique was discussed. The results showed that the technique was a reliable and simple tool for RIA/IRMA and quantitative PCR assay. (author)

  10. 磁选柱的分选特性分析与实践应用%Characteristic Analysis and Application of the Separation of Magnetic Separation Column

    Institute of Scientific and Technical Information of China (English)

    赵通林; 陈中航; 陈广振

    2013-01-01

    The Magnetic field characteristics,the separation process,and the industrial application of magnetic separation column are analyzed in this paper.The reason why the separation precision is so high is discussed.The practice showed when the magnetic separation column was used,the grade of the iron concentrate is 2% ~ 5% higher than that of the Drum magnetic separator.Also,some improvements are pointed for the further research.%本文分析了磁选柱的磁场特性、分选过程和工业生产情况,讨论了磁选柱分选精度高的原因.实践表明,磁选柱用于精选作业,分选磁铁矿低品位粗精矿最终精矿铁品位优于筒式磁选机精矿2%~5%.同时指出了需改进之处,为进一步的开发研究工作提供了方向.

  11. Accessible and green manufacturing of magnetite (ferrous ferric oxide) nanocrystals and their use in magnetic separations

    Science.gov (United States)

    Yavuz, Cafer Tayyar

    This work describes the first size dependent magnetic separation in nanoscale. Magnetite (Fe3O4) nanocrystals of high quality and uniform size were synthesized with monodispersity below 10%. Magnetite nanocrystals of 4 nm to 33 nm (average diameter) were produced. Batch synthesis was shown to go up to 20 grams which is more than 10 times of a standard nanocrystal synthesis, without loosing the quality and monodispersity. Reactor design for mass (1 gram per hour) production of magnetite nanocrystals is reported for the first time. The cost of a kg of lab purity magnetite nanocrystals was shown to be 2600. A green synthesis that utilizes rust and edible oils was developed. The cost of a kg was brought down to 22. Size dependency of magnetism was shown in nanoscale for the first time. Reversible aggregation theory was developed to explain the low field magnetic separation and solution behavior of magnetite nanocrystals. Arsenic was removed from drinking water with magnetite nanocrystals 200 times better than commercial adsorbents. Silica coating was successfully applied to enable the known silica related biotechnologies. Magnetite-silica nanoshells were functionalized with amino groups. For the first time, silver was coated on the magnetite-silica nanoshells to produce triple multishells. Anti-microbial activity of multishells is anticipated.

  12. Effect of microwave irradiation on selective heating behavior and magnetic separation characteristics of Panzhihua ilmenite

    Science.gov (United States)

    Zhao, Wei; Chen, Jin; Chang, Xiaodong; Guo, Shenghui; Srinivasakannan, C.; Chen, Guo; Peng, Jinhui

    2014-05-01

    The influences of microwave irradiation on the surface characteristics of Panzhihua ilmenite were systematically investigated. The crystal structures, surface morphology and surface chemical functional groups of ilmenite were characterized before and after microwave irradiation and magnetic separation for different microwave treatment times by using various methods, such as XRD, SEM, and FT-IR, respectively. XRD analysis showed that the microwave treated ilmenite has the strongest peaks of phase more than that of raw samples, indicates that the crystalline compound of ilmenite increased with the microwave irradiation time. SEM analysis showed the micro-cracking appeared at many grain boundaries of ilmenite after being pretreated by microwave treatment. The separations of ilmenite from gangue minerals were completed and the micro-fissure within ilmenite minerals were also formed, which could be attributed to the microwave selective heating characteristics of the different minerals and compounds, and the thermal stresses were caused by the uniform heat rate disturbed under microwave irradiation. The mineral processing results showed that the magnetic separation characteristics and properties of microwave treated ilmenite samples were better than that of microwave untreated ilmenite samples. It was concluded that microwave irradiation can be applied effectively and efficiently to the irradiation processes of Panzhihua ilmenite.

  13. Performance of a New Magnetic Chitosan Nanoparticle to Remove Arsenic and Its Separation from Water

    Directory of Open Access Journals (Sweden)

    Cheng Liu

    2015-01-01

    Full Text Available Removal performance of arsenic in water by a novel magnetic chitosan nanoparticle (MCNP with a diameter of about 10 nm, including adsorption kinetics, adsorption isotherm, main influencing factors, and regeneration effects, was investigated. In addition, the effective separation way for MCNP particles and the new application mode were developed to prompt the application of MCNP. The results showed that MCNP exhibited excellent ability to remove As(V and As(III from water in a wide range of initial concentrations, MCNP removed arsenic rapidly with more than 95% of arsenic adsorbed in initial 15 min, and the whole process fitted well to the pseudo-second-order model. The Langmuir model fits the equilibrium data better than the Freundlich isotherm model and the maximum adsorption capacities of As(V and As(III were 65.5 mg/g and 60.2 mg/g, respectively. The saturated MCNP could be easily regenerated and kept more than 95% of initial adsorption capacity stable after 10 regeneration cycles. A new magnetic material separation method was established to separate MCNP effectively. The continuous-operation instrument developed based on the MCNP could operate stably and guarantee that the concentration of arsenic meets the guideline limit of arsenic in drinking water regulated by the WHO.

  14. Upgrading of Low-Grade Manganese Ore by Selective Reduction of Iron Oxide and Magnetic Separation

    Science.gov (United States)

    Gao, Yubo; Olivas-Martinez, M.; Sohn, H. Y.; Kim, Hang Goo; Kim, Chan Wook

    2012-12-01

    The utilization of low-grade manganese ores has become necessary due to the intensive mining of high-grade ores for a long time. In this study, calcined ferruginous low-grade manganese ore was selectively reduced by CO, which converted hematite to magnetite, while manganese oxide was reduced to MnO. The iron-rich component was then separated by magnetic separation. The effects of the various reduction parameters such as particle size, reduction time, temperature, and CO content on the efficiency of magnetic separation were studied by single-factor experiments and by a comprehensive full factorial experiment. Under the best experimental conditions tested, the manganese content in the ore increased from around 36 wt pct to more than 44 wt pct, and almost 50 wt pct of iron was removed at a Mn loss of around 5 pct. The results of the full factorial experiments allowed the identification of the significant effects and yielded regression equations for pct Fe removed, Mn/Fe, and pct Mn loss that characterize the efficiency of the upgrading process.

  15. Rapid detection and purification of sequence specific DNA binding proteins using magnetic separation

    Directory of Open Access Journals (Sweden)

    TIJANA SAVIC

    2006-02-01

    Full Text Available In this paper, a method for the rapid identification and purification of sequence specific DNA binding proteins based on magnetic separation is presented. This method was applied to confirm the binding of the human recombinant USF1 protein to its putative binding site (E-box within the human SOX3 protomer. It has been shown that biotinylated DNA attached to streptavidin magnetic particles specifically binds the USF1 protein in the presence of competitor DNA. It has also been demonstrated that the protein could be successfully eluted from the beads, in high yield and with restored DNA binding activity. The advantage of these procedures is that they could be applied for the identification and purification of any high-affinity sequence-specific DNA binding protein with only minor modifications.

  16. The separated electric and magnetic field responses of luminescent bacteria exposed to pulsed microwave irradiation

    Science.gov (United States)

    Williams, Catrin F.; Geroni, Gilles M.; Pirog, Antoine; Lloyd, David; Lees, Jonathan; Porch, Adrian

    2016-08-01

    Electromagnetic fields (EMFs) are ubiquitous in the digital world we inhabit, with microwave and millimetre wave sources of non-ionizing radiation employed extensively in electronics and communications, e.g., in mobile phones and Wi-Fi. Indeed, the advent of 5G systems and the "internet of things" is likely to lead to massive densification of wireless networks. Whilst the thermal effects of EMFs on biological systems are well characterised, their putative non-thermal effects remain a controversial subject. Here, we use the bioluminescent marine bacterium, Vibrio fischeri, to monitor the effects of pulsed microwave electromagnetic fields, of nominal frequency 2.5 GHz, on light emission. Separated electric and magnetic field effects were investigated using a resonant microwave cavity, within which the maxima of each field are separated. For pulsed electric field exposure, the bacteria gave reproducible responses and recovery in light emission. At the lowest pulsed duty cycle (1.25%) and after short durations (100 ms) of exposure to the electric field at power levels of 4.5 W rms, we observed an initial stimulation of bioluminescence, whereas successive microwave pulses became inhibitory. Much of this behaviour is due to thermal effects, as the bacterial light output is very sensitive to the local temperature. Conversely, magnetic field exposure gave no measurable short-term responses even at the highest power levels of 32 W rms. Thus, we were able to detect, de-convolute, and evaluate independently the effects of separated electric and magnetic fields on exposure of a luminescent biological system to microwave irradiation.

  17. Magnetically Separable Base Catalysts: Heterogeneous Catalysis vs. Quasi-Homogeneous Catalysis

    Directory of Open Access Journals (Sweden)

    Raed Abu-Reziq

    2012-03-01

    Full Text Available The synthesis of magnetically separable quasi-homogeneous base catalyst and heterogeneous base catalyst is described. The quasi-homogeneous catalyst is achieved by supporting silane monomers functionalized with different amine groups directly on the surface of magnetite nanoparticles. The heterogeneous catalyst is prepared via a sol-gel process in which silane monomers containing different amine groups are copolymerized with tetraethoxysilane in the presence of magnetite nanoparticles functionalized with ionic liquid moieties. The reactivity of the quasi-homogeneous and the heterogeneous base catalysts is compared in the nitroaldol condensation.

  18. Steelmaking slag beneficiation by magnetic separator and impacts on sinter quality

    Directory of Open Access Journals (Sweden)

    Bölükbaşı Ö.S.

    2014-01-01

    Full Text Available Basic oxygen furnaces (BOF slag is the main problem at all iron and steel factories. About more than 6 million tons/year of BOF slag has been accumulated from the waste stockyards in Turkey. Dumps slags can be revaluated by a processing technology which makes it possible to obtain products that meet the requirements of sintering and blast furnace production. The slags with particle size of -10 mm were enriched by the magnetic separator resulting and increase in Fe grade from 18% to 33%. The use of BOF slag in sinter blend provided additional Mn, CaO, MgO and introduced a good solution to environmental problems.

  19. Heterostructured magnetite-titanate nanosheets for prompt charge selective binding and magnetic separation of mixed proteins.

    Science.gov (United States)

    Zhou, Qinhua; Lu, Zhufeng; Cao, Xuebo

    2014-02-01

    We reported the prompt charge selective binding and magnetic separation of mixed proteins by utilizing heterostructured Fe3O4-Na2Ti3O7 nanosheets. Fe3O4-Na2Ti3O7 nanosheets are found to combine a variety of structure and property merits, such as the increased interlayer galleries, exposed exchange sites, flexible framework, and magnetic manipulability. Probing the dissociation dynamics of Na(+) inside the nanosheets reveals that they possess remarkably enhanced Na(+) dissociation capability and the dissociation rate of Na(+) reaches 7.9×10(-)(6)mol g(-)(1)s(-)(1), much superior to titanate nanotubes. In model protein separation experiments, we utilize mixed proteins containing albumin and hemoglobin to assess Fe3O4-Na2Ti3O7 nanosheets. It is found that, by controlling the pH of the sample at 6, positively charged hemoglobin and negatively charged albumin are immediately separated (∼5s) by the nanosheets and the saturated loading capacity of hemoglobin on the nanosheets reaches 4.7±0.61g g(-)(1). Furthermore, hemoglobin bound to the nanosheets can be readily released after buffer wash and is not damaged, while the nanosheets are recyclable and maintain their high efficiency. The outstanding performance of Fe3O4-Na2Ti3O7 nanosheets in separating mixed proteins is attributed to the ultrafast Na(+) dissociation rate, flexible titanate framework, open geometry, and aqueous-like environment to stabilize proteins. These merits, together with the recyclability and cost effectiveness, should make Fe3O4-Na2Ti3O7 nanosheets ideal candidates for biological recognition, isolation, and purification under technologically useful conditions. PMID:24267329

  20. Glassy ferromagnetism and magnetic phase separation in La1-xSrxCoO3

    Science.gov (United States)

    Wu, J.; Leighton, C.

    2003-05-01

    We present the results of a comprehensive investigation of the dc magnetization, ac susceptibility, and magnetotransport properties of the glassy ferromagnet La1-xSrxCoO3. The compositions studied span the range from the end-member LaCoO3 (x=0.0) through to x=0.7. These materials have attracted attention recently, primarily due to the spin-state transition phenomena in LaCoO3 and the unusual nature of the magnetic ground state for finite x. In this paper we present a consistent picture of the magnetic behavior of La1-xSrxCoO3 in terms of short-range ferromagnetic ordering and intrinsic phase separation. At high Sr doping (x>0.2) the system exhibits unconventional ferromagnetism (with a Curie temperature up to 250 K), which is interpreted in terms of the coalescence of short-range-ordered ferromagnetic clusters. Brillouin function fits to the temperature dependence of the magnetization as well as high-temperature Curie-Weiss behavior suggest that the Co3+ and Co4+ ions are both in the intermediate spin state. At lower Sr doping (xbehavior. On the other hand, field cooling results in a relatively large ferromagneticlike moment, with zero-field-cooled and field-cooled magnetizations bifurcating at an irreversibility point. Even in the region above x=0.2 the out-of-phase component of the ac susceptibility shows frequency-dependent peaks below the Curie temperature (indicative of glassy behavior) which have previously been interpreted in terms of the freezing of clusters. All of the results are consistent with the existence of a strong tendency towards magnetic phase separation in this material, a conclusion which is further reinforced by consideration of the electronic properties. The metal-insulator transition is observed to be coincident with the onset of ferromagnetic ordering (x=0.18) and has a behavior in the doping dependence of the low-temperature conductivity which is strongly suggestive of percolation. This can be interpreted as a percolation transition within

  1. TREATMENT OF COMBINED SEWER OVERFLOWS BY HIGH GRADIENT MAGNETIC SEPARATION. ON-SITE TESTING WITH MOBILE PILOT PLANT TRAILER

    Science.gov (United States)

    Seeded water treatment using a SALA high gradient magnetic separator pilot plant system was conducted on combined sewer overflows and raw sewage at SALA Magnetics in Cambridge, MA and at on-site locations in the Boston area. Special emphasis was placed on specific design and oper...

  2. Continuous Separation of Inclusions from Aluminum Melt Flowing in a Circular Pipe using a High Frequency Magnetic Field

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    The continuous separation of inclusions from aluminum melt flowing in a circular pipe using a high frequency magneticfield was investigated both theoretically and experimentally. The separation efficiency was calculated based on thetrajectory method and compared with experimental results. lt is found that the separation efficiency is a function ofnondimensional parameters ti @ d2B2/μfμea2 and a /δ The effective way to improve the separation efficiency is to increasethe effective magnetic flux density and decrease the pipe radius, and the value of a/δ should be kept about 2 in orderto obtain the optimum separation efficiency.

  3. Development program for magnetically assisted chemical separation: Evaluation of cesium removal from Hanford tank supernatant

    International Nuclear Information System (INIS)

    Magnetic particles (MAG*SEPSM) coated with various absorbents were evaluated for the separation and recovery of low concentrations of cesium from nuclear waste solutions. The MAG*SEPSM particles were coated with (1) clinoptilolite, (2) transylvanian volcanic tuff, (3) resorcinol formaldehyde, and (4) crystalline silico-titanate, and then were contacted with a Hanford supernatant simulant. Particles coated with the crystalline silico-titanate were identified by Bradtec as having the highest capacity for cesium removal under the conditions tested (variation of pH, ionic strength, cesium concentration, and absorbent/solution ratio). The MAG*SEPSM particles coated with resorcinol formaldehyde had high distribution ratios values and could also be used to remove cesium from Hanford supernant simulant. Gamma irradiation studies were performed on the MAG*SEPSM particles with a gamma dose equivalent to 100 cycles of use. This irradiation decreased the loading capacity and distribution ratios for the particles by greater than 75%. The particles demonstrated high sensitivity to radiolytic damage due to the degradation of the polymeric regions. These results were supported by optical microscopy measurements. Overall, use of magnetic particles for cesium separation under nuclear waste conditions was found to be marginally effective

  4. Non-magnetic insulator state in Na1CoO2 and phase separation of Na vacancies

    OpenAIRE

    de Vaulx, C.; Julien, M. -H.; Berthier, C.; Horvatic, M.; Bordet, P.; Simonet, V.; Chen, D. P.; Lin, C. T.

    2005-01-01

    Crystallographic, magnetic and NMR properties of a NaxCoO2 single crystal with x~1 are presented. We identify the stoichiometric Na1CoO2 phase, which is shown to be a non-magnetic insulator, as expected for homogeneous planes of Co3+ ions with S=0. In addition, we present evidence that, because of slight average Na deficiency, chemical and electronic phase separation leads to a segregation of Na vacancies into the well-defined, magnetic, Na0.8CoO2 phase. The importance of phase separation is ...

  5. Adsorption mechanism of magnetically separable Fe3O4/graphene oxide hybrids

    Science.gov (United States)

    Ouyang, Ke; Zhu, Chuanhe; Zhao, Ya; Wang, Leichao; Xie, Shan; Wang, Qun

    2015-11-01

    A reclaimable Fe3O4/graphene oxide (GO) magnetic hybrid was successfully synthesized via a facile one-pot polyol approach and employed as a recyclable adsorbent for Bisphenol A (BPA) in aqueous solutions. The maximum adsorption capacity (qm) of the Fe3O4/GO hybrid for BPA was 72.80 mg/g at 273 K. The kinetics of the adsorption process and the adsorption isotherm data were fitted using the Freundlich equation and a pseudo-second-order kinetic model. The results of the thermodynamic parameters ΔH°, ΔS° and ΔG° showed that the adsorption process was exothermic and spontaneous. Furthermore, the reusability of the samples was investigated, and the results indicated that the samples exhibited high stability. The magnetic characterization demonstrated that hybrids were superparamagnetic and could be recovered conveniently by magnetic separation. The strong π-π interaction was determined to be the predominant driving force behind the adsorption of BPA onto the Fe3O4/GO hybrid. Therefore, the Fe3O4/GO hybrid could be regarded as a potential adsorbent for wastewater treatment and purification processes.

  6. Easily separated silver nanoparticle-decorated magnetic graphene oxide: Synthesis and high antibacterial activity.

    Science.gov (United States)

    Zhang, Huai-Zhi; Zhang, Chang; Zeng, Guang-Ming; Gong, Ji-Lai; Ou, Xiao-Ming; Huan, Shuang-Yan

    2016-06-01

    Silver nanoparticle-decorated magnetic graphene oxide (MGO-Ag) was synthesized by doping silver and Fe3O4 nanoparticles on the surface of GO, which was used as an antibacterial agent. MGO-Ag was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Energy dispersive X-ray (EDS), X-ray diffraction (XRD), Raman spectroscopy and magnetic property tests. It can be found that magnetic iron oxide nanoparticles and nano-Ag was well dispersed on graphene oxide; and MGO-Ag exhibited excellent antibacterial activity against Escherichia coli and Staphylococcus aureus. Several factors were investigated to study the antibacterial effect of MGO-Ag, such as temperature, time, pH and bacterial concentration. We also found that MGO-Ag maintained high inactivation rates after use six times and can be separated easily after antibacterial process. Moreover, the antibacterial mechanism is discussed and the synergistic effect of GO, Fe3O4 nanoparticles and nano-Ag accounted for high inactivation of MGO-Ag.

  7. Effect of microwave irradiation on selective heating behavior and magnetic separation characteristics of Panzhihua ilmenite

    International Nuclear Information System (INIS)

    Highlights: • Microwave irradiation can be applied effectively and efficiently to the irradiation processes of Panzhihua ilmenite. • The mineral processing properties of microwave treated ilmenite were generally as good as or better than that of initial ilmenite. • The microwave selective heating characteristics of the different minerals and compounds, and the thermal stresses were caused by the uniform heat rate disturbed under microwave irradiation. - Abstract: The influences of microwave irradiation on the surface characteristics of Panzhihua ilmenite were systematically investigated. The crystal structures, surface morphology and surface chemical functional groups of ilmenite were characterized before and after microwave irradiation and magnetic separation for different microwave treatment times by using various methods, such as XRD, SEM, and FT-IR, respectively. XRD analysis showed that the microwave treated ilmenite has the strongest peaks of phase more than that of raw samples, indicates that the crystalline compound of ilmenite increased with the microwave irradiation time. SEM analysis showed the micro-cracking appeared at many grain boundaries of ilmenite after being pretreated by microwave treatment. The separations of ilmenite from gangue minerals were completed and the micro-fissure within ilmenite minerals were also formed, which could be attributed to the microwave selective heating characteristics of the different minerals and compounds, and the thermal stresses were caused by the uniform heat rate disturbed under microwave irradiation. The mineral processing results showed that the magnetic separation characteristics and properties of microwave treated ilmenite samples were better than that of microwave untreated ilmenite samples. It was concluded that microwave irradiation can be applied effectively and efficiently to the irradiation processes of Panzhihua ilmenite

  8. Magnetic separation of encapsulated islet cells labeled with superparamagnetic iron oxide nano particles.

    Science.gov (United States)

    Mettler, Esther; Trenkler, Anja; Feilen, Peter J; Wiegand, Frederik; Fottner, Christian; Ehrhart, Friederike; Zimmermann, Heiko; Hwang, Yong Hwa; Lee, Dong Yun; Fischer, Stefan; Schreiber, Laura M; Weber, Matthias M

    2013-01-01

    Islet cell transplantation is a promising option for the restoration of normal glucose homeostasis in patients with type 1 diabetes. Because graft volume is a crucial issue in islet transplantations for patients with diabetes, we evaluated a new method for increasing functional tissue yield in xenogeneic grafts of encapsulated islets. Islets were labeled with three different superparamagnetic iron oxide nano particles (SPIONs; dextran-coated SPION, siloxane-coated SPION, and heparin-coated SPION). Magnetic separation was performed to separate encapsulated islets from the empty capsules, and cell viability and function were tested. Islets labeled with 1000 μg Fe/ml dextran-coated SPIONs experienced a 69.9% reduction in graft volume, with a 33.2% loss of islet-containing capsules. Islets labeled with 100 μg Fe/ml heparin-coated SPIONs showed a 46.4% reduction in graft volume, with a 4.5% loss of capsules containing islets. No purification could be achieved using siloxane-coated SPIONs due to its toxicity to the primary islets. SPION labeling of islets is useful for transplant purification during islet separation as well as in vivo imaging after transplantation. Furthermore, purification of encapsulated islets can also reduce the volume of the encapsulated islets without impairing their function by removing empty capsules.

  9. The selection of a matrix for the recovery of uranium by wet high-intensity magnetic separation

    International Nuclear Information System (INIS)

    The proper choice of a suitable matrix for high-intensity magnetic separation is of the utmost importance, since the geometry and size of the matrix play decisive roles in the achievement of optimum separation conditions. In relatively simple filtration applications, the matrix must offer a high efficiency of collision with suspended particles, a high probability of retention of intercepted particles, and high loading capacity. Also, it must be easily cleaned. The results obtained by the use of theoretical models of magnetic separation fail to agree with the experimental results for basic parameters like the ratio of particle size to matrix size, the length of the matrix, and the magnetic properties of the matrix material. Preconceived ideas about the matrix often lead to the erroneous choice of a matrix, and hence to its unsatisfactory performance during magnetic separation. The potential value of high-intensity magnetic separation as applied to the recovery of uranium and gold from leach residues and in association with the development of a large-scale magnetic separator to be used for the same purpose led to the present investigation in which a wide spectrum of matrix shapes and sizes were tested. It was found that the optimum recovery and selectivity of separation are obtained at a ratio of particle size to matrix-element size ranging from 200 to 300. The use of these matrices also results in a low degree of mechanical entrapment, particularly of coarser particles, for which straining plays a significant role for fine matrices. It was also found that the magnetization of a matrix plays a minor role, contrary to the theoretical predictions. Furthermore, the effects of matrix height, matrix loading, and scalping of the pulp by paramagnetic matrices were evaluated for various types of matrices

  10. Pade-Froissart exact signal-noise separation in nuclear magnetic resonance spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Belkic, Dzevad; Belkic, Karen, E-mail: Dzevad.Belkic@ki.se [Karolinska Institute, PO Box 260, S-171 76 Stockholm (Sweden)

    2011-06-28

    Nuclear magnetic resonance spectroscopy is one of the key methods for studying the structure of matter on different levels (sub-nuclear, nuclear, atomic, molecular, cellular, etc). Its overall success critically depends upon reliable mathematical analysis and interpretation of the studied data. This is especially aided by parametric signal processing with the ensuing data quantification, which can yield the abundance or concentrations of the constituents in the examined matter. The sought reliability of signal processing rests upon the possibility of an accurate solution of the quantification problem alongside the unambiguous separation of true from false information in the spectrally analysed data. We presently demonstrate that the fast Pade transform (FPT), as the unique ratio of two polynomials for a given Maclaurin series, can yield exact signal-noise separation for a synthesized free induction decay curve built from 25 molecules. This is achieved by using the concept of Froissart doublets or pole-zero cancellations. Unphysical/spurious (noise or noise-like) resonances have coincident or near-coincident poles and zeros. They possess either zero- or near-zero-valued amplitudes. Such spectral structures never converge due to their instability against even the smallest perturbations. By contrast, upon convergence of the FPT, physical/genuine resonances are identified by their persistent stability against external perturbations, such as signal truncation or addition of random noise, etc. In practice, the computation is carried out by gradually and systematically increasing the common degree of the Pade numerator and denominator polynomials in the diagonal FPT. As this degree changes, the reconstructed parameters and spectra fluctuate until stabilization occurs. The polynomial degree at which this full stabilization is achieved represents the sought exact number of resonances. An illustrative set of results is reported in this work to show the exact separation of

  11. 辊式磁选机典型磁系结构磁场特性分析%Analysis on the Magnetic Field Characteristic of Roll Magnetic Separators with Different Magnetic System Structure

    Institute of Scientific and Technical Information of China (English)

    张义顺; 史长亮; 马娇; 王飞跃

    2013-01-01

    辊式磁选机对中强磁性矿物分选多为经验式分选,不同磁系磁场特性与对应磁选矿物基本物性(密度、比磁化率)间的相互关系并无探讨.基于MagNet软件模拟辊式磁选机单环磁系、四级拼接磁系(无轭铁)、八级拼接磁系(有/无轭铁)的磁力线及磁感应强度分布情况,得出各磁系磁场沿辊表周向变化趋势及磁感应强度随分选行程变化函数关系;考察了单元磁性颗粒在力平衡条件下其密度同比磁化率的比值与各磁系磁感应强度函数关系,综合分析得出不同磁系类型下矿物的分选标准.对辊式磁选机常用磁系磁场特性分析,为选择合适的辊式磁选机进行中强磁性矿物的高效分选提供基础理论指导.%Roll magnetic separators are blandly used to separate moderate and strong susceptibility minerals,but the correlation between the magnetic field characteristic of different magnetic system and the characteristics (density and per magnetic susceptibility) of minerals is rarely discussed.The paper simulated the magnetic field lines distribution and magnetic induction intensity of different magnetic system,including:single ring prototype,four-magnetic splicing poles prototype without yoke,eight-magnetic splicing poles prototype with and without yoke.The function between the magnetic induction intensity and separation distance was given.The function between ratios of the density and magnetic susceptibility of single magnetic particle,and the magnetic field strength of different magnetic system was studied.By comprehensive analysis,the minerals separation standard corresponding to magnetic system prototype was obtained.The magnetic field characteristics of roll magnetic separators with different magnetic system were analyzed,the results could provide basic theoretical guidance for the selection of a suitable roll magnetic separator to efficiently separate moderate and strong magnetic minerals.

  12. Blind Source Separation of Hemodynamics from Magnetic Resonance Perfusion Brain Images Using Independent Factor Analysis

    Directory of Open Access Journals (Sweden)

    Yen-Chun Chou

    2010-01-01

    Full Text Available Perfusion magnetic resonance brain imaging induces temporal signal changes on brain tissues, manifesting distinct blood-supply patterns for the profound analysis of cerebral hemodynamics. We employed independent factor analysis to blindly separate such dynamic images into different maps, that is, artery, gray matter, white matter, vein and sinus, and choroid plexus, in conjunction with corresponding signal-time curves. The averaged signal-time curve on the segmented arterial area was further used to calculate the relative cerebral blood volume (rCBV, relative cerebral blood flow (rCBF, and mean transit time (MTT. The averaged ratios for rCBV, rCBF, and MTT between gray and white matters for normal subjects were congruent with those in the literature.

  13. Preconcentration and separation of ultra-trace palladium ion using pyridine-functionalized magnetic nanoparticles

    International Nuclear Information System (INIS)

    We present a study on the application of magnetic nanoparticles (MNPs) prepared from Fe3O4 and functionalized with pyridine as an adsorbent for the solid-phase extraction of trace quantities of Pd(II) ion. The pyridine group was immobilized on the surface of the MNPs by covalent bonding of isonicotinamide. The modified MNPs can be readily separated from an aqueous solution by applying an external magnetic field. Effects of pH, the amount of functionalized MNPs, extraction time, type and quantity of eluent, desorption time, break-through volume and interfering ions on the extraction efficiency were optimized. The amount of Pd(II) was then determined using FAAS. Under the optimized conditions, the detection limit and preconcentration factor are 0.15 μg L-1 and 196, respectively, and the relative standard deviation (at 20 μgL-1; for n=10) is 3.7 %. The method had a linear analytical range from 1 to 80 μg L-1 and was applied to determine Pd(II) in spiked tape water and soil. (author)

  14. Removal of phosphate from municipal sewage by high gradient magnetic separation

    Institute of Scientific and Technical Information of China (English)

    黄自力; 胡岳华; 徐竞; 郑春华

    2004-01-01

    The removal of phosphate from municipal sewage by high gradient magnetic separation using aluminium sulphate as precipitating agent and Fe3O4 as seeding material was studied. The effects of aluminium sulphate,Fe3O4, magnetic field intensity, pH value and flow-rate of sewage on phosphorus removal rate were investigated.200 kA/m, pH value of 4.5 - 7.0 and flow-rate of 6.15 cm/s are both efficient and economic technical parameters for removal of phosphate. The pH value has a tremendous effect on the removal of phosphate. In the pH range of 4.5- 7.0, more than 95% phosphate can be removed. Theoretical analysis indicates that the solubility of AlPO4 is minimum at pH 4.0 - 7.0 and the electrostatic attractive force between AlPO4 and Fe3O4 is maximum at pH 4.5 -6.5.

  15. Templated synthesis of monodisperse mesoporous maghemite/silica microspheres for magnetic separation of genomic DNA

    International Nuclear Information System (INIS)

    A novel method is described for the preparation of superparamagnetic mesoporous maghemite (γ-Fe2O3)/silica (SiO2) composite microspheres to allow rapid magnetic separation of DNA from biological samples. With magnetite (Fe3O4) and silica nanoparticles as starting materials, such microspheres were synthesized by the following two consecutive steps: (1) formation of monodispersed organic/inorganic hybrid microspheres through urea-formaldedyde (UF) polymerization and (2) removal of the organic template and phase transformation of Fe3O4 to γ-Fe2O3 by calcination at elevated temperatures. The as-synthesized particles obtained by heating at temperature 300 deg. C feature spherical shape and uniform particle size (dparticle=1.72 μm), high saturation magnetization (Ms=17.22 emu/g), superparamagnetism (Mr/Ms=0.023), high surface area (SBET=240 m2/g), and mesoporosity (dpore=6.62 nm). The composite microsphere consists of interlocked amorphous SiO2 nanoparticles, in which cubic γ-Fe2O3 nanocrystals are homogeneously dispersed and thermally stable against γ- to α-phase transformation at temperatures up to 600 deg. C. With the exposed iron oxide nanoparticles coated with a thin layer of silica shell, the magnetic microspheres were used as a solid-phase adsorbent for rapid extraction of genomic DNA from plant samples. The results show that the DNA templates isolated from pea and green pepper displayed single bands with molecular weights greater than 8 kb and A260/A280 values of 1.60-1.72. The PCR amplification of a fragment encoding the endogenous chloroplast ndhB gene confirmed that the DNA templates obtained were inhibitor-free and amenable to sensitive amplification-based DNA technologies.

  16. Optimized high gradient magnetic separation for isolation of Plasmodium-infected red blood cells

    Directory of Open Access Journals (Sweden)

    Chimma Pattamawan

    2010-02-01

    Full Text Available Abstract Background Highly purified infected red blood cells (irbc, or highly synchronized parasite cultures, are regularly required in malaria research. Conventional isolation and synchronization rely on density and osmotic fragility of irbc, respectively. High gradient magnetic separation (HGMS offers an alternative based on intrinsic magnetic properties of irbc, avoiding exposure to chemicals and osmotic stress. Successful HGMS concentration in malaria research was previously reported using polymer coated columns, while HGMS depletion has not been described yet. This study presents a new approach to both HGMS concentration and depletion in malaria research, rendering polymer coating unnecessary. Methods A dipole magnet generating a strong homogenous field was custom assembled. Polypropylene syringes were fitted with one-way stopcocks and filled with stainless steel wool. Rbc from Plasmodium falciparum cultures were resuspended in density and viscosity optimized HGMS buffers and HGMS processed. Purification and depletion results were analysed by flow cytometer and light microscopy. Viability was evaluated by calculating the infection rate after re-culturing of isolates. Results In HGMS concentration, purity of irbc isolates from asynchronous cultures consistently ranged from 94.8% to 98.4% (mean 95.7%. With further optimization, over 90% of isolated irbc contained segmented schizonts. Processing time was less than 45 min. Reinfection rates ranged from 21.0% to 56.4%. In HGMS depletion, results were comparable to treatment with sorbitol, as demonstrated by essentially identical development of cultures. Conclusion The novel HGMS concentration procedure achieves high purities of segmented stage irbc from standard asynchronous cultures, and is the first HGMS depletion alternative to sorbitol lysis. It represents a simple and highly efficient alternative to conventional irbc concentration and synchronization methods.

  17. Actinide separation of high-level waste using solvent extractants on magnetic microparticles

    International Nuclear Information System (INIS)

    Polymeric-coated ferromagnetic particles with an absorbed layer of octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) diluted by tributyl phosphate (TBP) are being evaluated for application in the separation and the recovery of low concentrations of americium and plutonium from nuclear waste solutions. Due to their chemical nature, these extractants selectively complex americium and plutonium contaminants onto the particles, which can be recovered from the waste solution using a magnet. The effectiveness of the extractant-absorbed particles at removing transuranics (TRU) from simulated solutions and various nitric acid solutions was measured by gamma and liquid scintillation counting of plutonium and americium. The HNO3 concentration range was 0.01 M to 6M. The partition coefficients (Kd) for various actinides at 2M HNO3 were determined to be between 3,000 and 30,000. These values are larger than those projected for TRU recovery by traditional liquid/liquid extraction. Results from transmission electron microscopy indicated a large dependence of Kd on relative magnetite location within the polymer and the polymer surface area. Energy disperse spectroscopy demonstrated homogeneous metal complexation on the polymer surface with no metal clustering. The radiolytic stability of the particles was determined by using 60Co gamma irradiation under various conditions. The results showed that Kd more strongly depends on the nitric acid dissolution rate of the magnetite than the gamma irradiation dose. Results of actinide separation from simulated high-level waste representative of that at various DOE sites are also discussed

  18. Formation of iron oxides from acid mine drainage and magnetic separation of the heavy metals adsorbed iron oxides

    Energy Technology Data Exchange (ETDEWEB)

    Kwon, Hee Won; Kim, Jeong Jin; Kim, Young Hun [Andong National University, Andong (Korea, Republic of); Ha, Dong Woo [Korea Electrotechnology Research Institute, Changwon (Korea, Republic of)

    2016-03-15

    There are a few thousand abandoned metal mines in South Korea. The abandoned mines cause several environmental problems including releasing acid mine drainage (AMD), which contain a very high acidity and heavy metal ions such as Fe, Cu, Cd, Pb, and As. Iron oxides can be formed from the AMD by increasing the solution pH and inducing precipitation. Current study focused on the formation of iron oxide in an AMD and used the oxide for adsorption of heavy metals. The heavy metal adsorbed iron oxide was separated with a superconducting magnet. The duration of iron oxide formation affected on the type of mineral and the degree of magnetization. The removal rate of heavy metal by the adsorption process with the formed iron oxide was highly dependent on the type of iron oxide and the solution pH. A high gradient magnetic separation (HGMS) system successfully separated the iron oxide and harmful heavy metals.

  19. Photocatalytic degradation of methylene blue on magnetically separable MgFe2O4 under visible light irradiation

    KAUST Repository

    Shahid, Muhammad

    2013-05-01

    A magnetically separable single-phase MgFe2O4 photocatalyst with a spinel crystal structure was synthesized by using the solid-state reaction method. The formation of spinel structure is confirmed by X-ray diffraction and Fourier transform infrared spectroscopy. The magnetic measurements showed that the photocatalyst material can be separated from water when an external magnetic field is added and redispersed into water solution after the external magnetic field is eliminated. It is one of the promising photocatalysts for waste water treatment. The photocatalytic activity of MgFe2O4 was investigated by using the photo-decomposition of methylene blue dye under visible light. The photoelectrochemical property of the MgFe2O4 was studied by measuring their photocurrent-potential behavior in 1 M NaOH electrolyte under AM 1.5100 mW cm-2 illumination. © 2013 Elsevier B.V. All rights reserved.

  20. Improved Peak Capacity for Capillary Electrophoretic Separations of Enzyme Inhibitors with Activity-Based Detection Using Magnetic Bead Microreactors

    OpenAIRE

    Yan, Xiaoyan; Gilman, S. Douglass

    2010-01-01

    A technique for separating and detecting enzyme inhibitors was developed using capillary electrophoresis with an enzyme microreactor. The on-column enzyme microreactor was constructed using NdFeB magnet(s) to immobilize alkaline phosphatase-coated superparamagnetic beads (2.8 μm diameter) inside a capillary before the detection window. Enzyme inhibition assays were performed by injecting a plug of inhibitor into a capillary filled with the substrate, AttoPhos. Product generated in the enzyme ...

  1. Functional-integral approach to the investigation of the spin-spiral magnetic order and phase separation

    OpenAIRE

    Arzhnikov, Anatoly; Groshev, Andrey

    2011-01-01

    We investigate a two-dimensional single-band Hubbard model with a nearest-neighbor hopping. We treat a commensurate collinear order as well as incommensurate spiral magnetic phases at a finite temperature using a Hubbard-Stratonovich transformation with a two-field representation and solve this problem in a static approximation. We argue that temperature dramatically influence the collinear and spiral magnetic phases, phase separation in the vicinity of half-filling. The results imply a possi...

  2. Electronic and magnetic nano phase separation in cobaltates La$_{2-x}$Sr$_{x}$CoO$_4$

    OpenAIRE

    Li, Z W; Drees, Y.; Ricci, A.; Lamago, D.; Piovano, A.; M. Rotter; Schmidt, W.; Sobolev, O.; Rütt, U.; Gutowski, O.; Sprung, M.; Castellan, J. P.; Tjeng, L. H.; Komarek, A. C.

    2016-01-01

    The single-layer perovskite cobaltates have attracted enormous attention due to the recent observation of hour-glass shaped magnetic excitation spectra which resemble the ones of the famous high-temperature superconducting cuprates. Here, we present an overview of our most recent studies of the spin and charge correlations in floating-zone grown cobaltate single crystals. We find that frustration and a novel kind of electronic and magnetic nano phase separation are intimately connected to the...

  3. Novel Monoclonal Antibody and Peptide Binders for Mycobacterium avium subsp. paratuberculosis and Their Application for Magnetic Separation

    OpenAIRE

    Lorna M O'Brien; Stewart, Linda D.; Strain, Sam A. J.; Grant, Irene R

    2016-01-01

    The generation of novel Mycobacterium avium subsp. paratuberculosis (MAP)-specific monoclonal antibodies and phage-display derived peptide binders, along with their application for the magnetic separation (MS) of MAP cells, is described. Our aim was to achieve even greater MAP capture capability than is possible with peptide-mediated magnetic separation (PMS) using a 50:50 mix of biotinylated-aMp3 and biotinylated-aMptD peptide-coated beads. Gamma-irradiated whole MAP cells and ethanol extrac...

  4. A rational design for the separation of metallic and semiconducting single-walled carbon nanotubes using a magnetic field

    Science.gov (United States)

    Luo, Chengzhi; Wan, Da; Jia, Junji; Li, Delong; Pan, Chunxu; Liao, Lei

    2016-06-01

    The separation of metallic (m-) and semiconducting (s-) single-walled carbon nanotubes (SWNTs) without causing contamination and damage is a major challenge for SWNT-based devices. As a facile and nondestructive tool, the use of a magnetic field could be an ideal strategy to separate m-/s-SWNTs, based on the difference of magnetic susceptibilities. Here, we designed a novel magnetic field-assisted floating catalyst chemical vapor deposition system to separate m-/s-SWNTs. Briefly, m-SWNTs are attracted toward the magnetic pole, leaving s-SWNTs on the substrate. By using this strategy, s-SWNTs with a purity of 99% could be obtained, which is enough to construct high-performance transistors with a mobility of 230 cm2 V-1 s-1 and an on/off ratio of 106. We also established a model to quantitatively calculate the percentage of m-SWNTs on the substrate and this model shows a good match with the experimental data. Furthermore, our rational design also provides a new avenue for the growth of SWNTs with specific chirality and manipulated arrangement due to the difference of magnetic susceptibilities between different diameters, chiralities, and types.The separation of metallic (m-) and semiconducting (s-) single-walled carbon nanotubes (SWNTs) without causing contamination and damage is a major challenge for SWNT-based devices. As a facile and nondestructive tool, the use of a magnetic field could be an ideal strategy to separate m-/s-SWNTs, based on the difference of magnetic susceptibilities. Here, we designed a novel magnetic field-assisted floating catalyst chemical vapor deposition system to separate m-/s-SWNTs. Briefly, m-SWNTs are attracted toward the magnetic pole, leaving s-SWNTs on the substrate. By using this strategy, s-SWNTs with a purity of 99% could be obtained, which is enough to construct high-performance transistors with a mobility of 230 cm2 V-1 s-1 and an on/off ratio of 106. We also established a model to quantitatively calculate the percentage of m

  5. Frequency-Domain Approach To Determine Magnetic Address-Sensor Separation Distance Using the Harmonic Ratio Method.

    Science.gov (United States)

    Young, Colin C; Blackley, Benjamin W; Porter, Marc D; Granger, Michael C

    2016-02-16

    In this work, we describe an approach to determine the distance separating a magnetic address from a scanning magnetoresistive sensor, a critical adjustable parameter for certain bioassay analyses where magnetic nanoparticles are used as labels. Our approach is leveraged from the harmonic ratio method (HRM), a method used in the hard drive industry to control the distance separating a magnetoresistive read head from its data platter with nanometer resolution. At the heart of the HRM is an amplitude comparison of a signal's fundamental frequency to that of its harmonics. When the signal is derived from the magnetic field pattern of a periodic array of magnetic addresses, the harmonic ratio contains the information necessary to determine the separation between the address array and the read head. The elegance of the HRM is that there is no need of additional components to the detection platform to determine a separation distance; the streaming "bit signal" contains all the information needed. In this work, we demonstrate that the tenets governing HRM used in the hard drive industry can be applied to the bioanalytical arena where submicrometer to 100 μm separations are required. PMID:26879366

  6. Effect of surface potential of small particles suspended in solution on separation characteristics in a HGMS (High Gradient Magnetic Separator)

    International Nuclear Information System (INIS)

    The effect of surface potential of particles on removal characteristics in the HGMS were studied by using three kinds of small particles with individually different magnetic susceptibility: molybdenum, chrominum and hematite. It was shown that the effect of surface potential of particles such as molybdenum with low magnetic susceptibility value less than 1.7 x 104 appeared at a low linear velocity of liquid less than 150 m/h, and the removal performance increased by controlling the pH range in which the product of ζ-potential of the particle and matrix was negative. The relation between the particles volume captured with matrix and the rest potential of the matrix was determined. (author)

  7. Separation of the contributions to the magnetization of Tm1 - x Yb x B12 solid solutions in steady and pulsed magnetic fields

    Science.gov (United States)

    Bogach, A. V.; Sluchanko, N. E.; Glushkov, V. V.; Demishev, S. V.; Azarevich, A. N.; Filippov, V. B.; Shitsevalova, N. Yu.; Levchenko, A. V.; Vanacken, J.; Moshchalkov, V. V.; Gabani, S.; Flachbart, K.

    2013-05-01

    The magnetization of substitutional Tm1 - x Yb x B12 solid solutions is studied in the composition range 0 B12 compounds to be separated. These contributions include a Pauli component, which corresponds to the response of the heavy-fermion manybody states that appears in the energy gap in the vicinity of the Fermi level (density of states (3-4) × 1021 cm-3 meV-1), and a contribution with saturation in high magnetic fields attributed to the localized magnetic moments ((0.8-3.7)μB per unit cell) of the nanoclusters formed by rare-earth ions with an antiferromagnetic interaction.

  8. Magnetic separation-based blood purification: a promising new approach for the removal of disease-causing compounds?

    OpenAIRE

    Herrmann, I K; Schlegel, A A; Graf, R.; Stark, W J; Beck-Schimmer, Beatrice

    2015-01-01

    Recent studies report promising results regarding extracorporeal magnetic separation-based blood purification for the rapid and selective removal of disease-causing compounds from whole blood. High molecular weight compounds, bacteria and cells can be eliminated from blood within minutes, hence offering novel treatment strategies for the management of intoxications and blood stream infections. However, risks associated with incomplete particle separation and the biological consequences of par...

  9. Experiment of Roasting-Low Intensity Magnetic Separation-High Intensity Magnetic Separation Technology of a Manganese-Bearing Hematite Ore%某含锰赤铁矿石焙烧-弱磁选-强磁选试验

    Institute of Scientific and Technical Information of China (English)

    唐雪峰; 李家林

    2012-01-01

    针对某赤铁矿石中褐锰矿含量较高的特点,通过磁化焙烧将赤铁矿还原为磁铁矿,然后采用弱磁选将铁与锰及脉石分离,并对弱磁选尾矿进行强磁选富集回收锰矿物,取得了铁精矿产率为71.32%、铁品位为64.18%、铁回收率为94.79%,锰精矿产率为13.78%、锰品位为27.98%,锰回收率为79.45%的试验指标,使铁和锰得到了较好的综合回收.%According to the characteristics of a hematite with high content braunite,first reduced the hematite to artificial magnetite by magnetizing roasting,then separated the iron with manganese and gangue by low intensity magnetic separation,recovered the manganese minerals from low intensity magnetic separation tailings by high intensity magnetic separation. The experiment results got the iron concentrate with yield 71. 32% ,iron grade 64. 18% ,iron recovery 94. 79% ,manganese concentrate with yield 13. 78% ,manganese grade 27. 98% ,manganese recovery 79. 45%. Iron and manganese are comprehensively recovered.

  10. Separation of charge-order and magnetic QCPs in heavy fermions and high Tc cuprates

    Science.gov (United States)

    Harrison, Neil

    2010-03-01

    The Fermi surface topology of high temperature superconductors inferred from magnetic quantum oscillation measurements provides clues for the origin of unconventional pairing thus previously not accessed by other spectroscopy techniques. While the overdoped regime of the high Tc phase diagram has a large Fermi surface consistent with bandstructure calculations, the underdoped regime of YBa2Cu2O6+x is found to be composed of small pockets. There is considerable debate as to whether the small observed ``pocket'' is hole-like or electron-like- whether the Fermi surface is best described by a t-J model or a conventional band folding picture- whether or not a Fermi liquid description applies- or- whether bilayer coupling splits the degeneracy of the observed pockets. We (myself and collaborators) have now collected an extensive body of experimental data that brings this debate to rest, but raises new questions about the nature of itinerant magnetism in underdoped high Tc cuprates. Quantum oscillation measurements are performed on multiple samples in magnetic fields extending to 85 T, temperatures between 30 mK (dilution fridge in dc fields to 45 T) and 18 K, over a range of hole dopings and with samples rotated in-situ about multiple axes with respect to the magnetic field. We perform a topographical map of the Fermi surface, enabling the in-plane shape of one of the pockets to be determined- imposing stringent constraints on the origin of the Fermi surface. While quantum oscillations measurements are consistent with a topological Fermi surface change associated with magnetism near optimal doping, they also point to a secondary instability deep within the underdoped regime beneath a high Tc superconducting sub-dome. An steep upturn in the quasiparticle effective mass is observed on underdoping, suggestive of a quantum critical point near x= 0.46 separating the metallic regime (composed of small pockets) from a more underdoped insulating charge-ordered regime (earlier

  11. Ferrimagnetism and magnetic phase separation in Nd1−xYxMnO3 studied by magnetization and high frequency electron paramagnetic resonance

    International Nuclear Information System (INIS)

    Ferrimagnetism and metamagnetic features tunable by composition are observed in the magnetic response of Nd1−xYxMnO3, for x=0.1–0.5. For all values of x in the series, the compound crystallizes in orthorhombic Pbnm space group similar to NdMnO3. Magnetization studies reveal a phase transition of the Mn-sublattice below TNMn≈80K for all compositions, which, decreases up on diluting the Nd-site with Yttrium. For x=0.35, ferrimagnetism is observed. At 5 K, metamagnetic transition is observed for all compositions x<0.4. The evolution of magnetic ground states and appearance of ferrimagnetism in Nd1−xYxMnO3 can be accounted for by invoking the scenario of magnetic phase separation. The high frequency electron paramagnetic resonance measurements on x=0.4 sample, which is close to the critical composition for phase separation, revealed complex temperature dependent lineshapes clearly supporting the assumption of magnetic phase separation

  12. Magnetically separable nanocomposites with photocatalytic activity under visible light for the selective transformation of biomass-derived platform molecules

    Science.gov (United States)

    Novel magnetically separable TiO2-guanidine-(Ni,Co)Fe2O4 nanomaterials were prepared and characterised by a series of techniques including XRD, SEM, TEM, N2 physisorption as well as XPS and subsequently tested for their photocatalytic activities in the selective transformation of...

  13. Metal organic framework derived magnetically separable 3-dimensional hierarchical Ni@C nanocomposites: Synthesis and adsorption properties

    Science.gov (United States)

    Song, Yixuan; Qiang, Tingting; Ye, Ming; Ma, Qiuyang; Fang, Zhen

    2015-12-01

    Design an effective absorbent that has high surface area, and perfect recyclable is imperative for pollution elimination. Herein, we report a facile two-step strategy to fabricate magnetically separable 3-dimensional (3D) hierarchical carbon-coated nickel (Ni@C) nanocomposites by calcinating nickel based metal organic framework (Ni3(OH)2(C8H4O4)2(H2O)4). SEM and TEM images illuminate that the nanocomposites were constructed by 8 nm nickel nanoparticle encapsulated in 3D flake like carbon. The specific surface area of the obtained nanocomposites is up to 120.38 m2 g-1. Room temperature magnetic measurement indicates the nanocomposites show soft magnetism property, which endows the nanocomposites with an ideal fast magnetic separable property. The maximum adsorption capacity of the nanocomposites for rhodamine B is 84.5 mg g-1. Furthermore, the nanocomposites also exhibit a high adsorption capacity for heavy metal ions. The adsorbent can be very easily separated from the solution by using a common magnet without exterior energy. The as-prepared Ni@C nanocomposites can apply in waste water treatment on a large-scale as a new adsorbent with high efficiency and excellent recyclability.

  14. Development of SSS Type High Gradient Magnetic Separator%SSS新型高梯度磁选机的改进

    Institute of Scientific and Technical Information of China (English)

    赵明; 黄雪平; 王丰雨

    2011-01-01

    High gradient magnetic separator because of its high magnetic field strength and magnetic field strength changes in range and other factors, has been development and utilization in mineral resources widely, however, the problem of media jam, low recovery rate and power consumption increased the election cost. SSS new high gradient magnetic separator taking high gradient magnetic separator in multi - graded media, air and water combined unloading ore and energy efficient technologies such as high frequency inverter power supply, effectively solute the media jam, and low recovery problems, more water - saving and electricity - saving than ever before.%高梯度磁选机因为其磁场力高且磁场力变化范围大等因素,已经在矿产资源的开发利用中得到广泛应用,但同时存在介质堵塞,回收率低,电能消耗大等问题,增加了选别成本.SSS新型高梯度磁选机中采用多梯度介质、气水联合卸矿和高效节能高频逆变型电源等技术,有效地解决了介质堵塞、回收率低等问题,而且比以往的设备更节水省电.

  15. Evaluation of Cyanex 923-coated magnetic particles for the extraction and separation of lanthanides and actinides from nuclear waste streams

    Energy Technology Data Exchange (ETDEWEB)

    Shaibu, B.S. [Chemical Sciences Division, Regional Research Laboratory (CSIR), Thiruvananthapuram-695019 (India); Reddy, M.L.P. [Chemical Sciences Division, Regional Research Laboratory (CSIR), Thiruvananthapuram-695019 (India)]. E-mail: mlpreddy@yahoo.co.uk; Bhattacharyya, A. [Radiochemistry Division, B.A.R.C, Trombay, Mumbai-400085 (India); Manchanda, V.K. [Radiochemistry Division, B.A.R.C, Trombay, Mumbai-400085 (India)

    2006-06-15

    In the magnetically assisted chemical separation (MACS) process, tiny ferromagnetic particles coated with solvent extractant are used to selectively separate radionuclides and hazardous metals from aqueous waste streams. The contaminant-loaded particles are then recovered from the waste solutions using a magnetic field. The contaminants attached to the magnetic particles are subsequently removed using a small volume of stripping agent. In the present study, Cyanex 923 (trialkylphosphine oxide) coated magnetic particles (cross-linked polyacrylamide and acrylic acid entrapping charcoal and iron oxide, 1:1:1, particle size=1-60 {mu}m) are being evaluated for the possible application in the extraction and separation of lanthanides and actinides from nuclear waste streams. The uptake behaviour of Th(IV), U(VI), Am(III) and Eu(III) from nitric acid solutions was investigated by batch studies. The effects of sorption kinetics, extractant and nitric acid concentrations on the uptake behaviour of metal ions were systematically studied. The influence of fission products (Cs(I), Sr(II)) and interfering ions including Fe(III), Cr(VI), Mg(II), Mn(II), and Al(III) were investigated. The recycling capacity of the extractant-coated magnetic particles was also evaluated.

  16. Evaluation of Cyanex 923-coated magnetic particles for the extraction and separation of lanthanides and actinides from nuclear waste streams

    Science.gov (United States)

    Shaibu, B. S.; Reddy, M. L. P.; Bhattacharyya, A.; Manchanda, V. K.

    2006-06-01

    In the magnetically assisted chemical separation (MACS) process, tiny ferromagnetic particles coated with solvent extractant are used to selectively separate radionuclides and hazardous metals from aqueous waste streams. The contaminant-loaded particles are then recovered from the waste solutions using a magnetic field. The contaminants attached to the magnetic particles are subsequently removed using a small volume of stripping agent. In the present study, Cyanex 923 (trialkylphosphine oxide) coated magnetic particles (cross-linked polyacrylamide and acrylic acid entrapping charcoal and iron oxide, 1:1:1, particle size=1-60 μm) are being evaluated for the possible application in the extraction and separation of lanthanides and actinides from nuclear waste streams. The uptake behaviour of Th(IV), U(VI), Am(III) and Eu(III) from nitric acid solutions was investigated by batch studies. The effects of sorption kinetics, extractant and nitric acid concentrations on the uptake behaviour of metal ions were systematically studied. The influence of fission products (Cs(I), Sr(II)) and interfering ions including Fe(III), Cr(VI), Mg(II), Mn(II), and Al(III) were investigated. The recycling capacity of the extractant-coated magnetic particles was also evaluated.

  17. Environmental friendly crush-magnetic separation technology for recycling metal-plated plastics from end-of-life vehicles.

    Science.gov (United States)

    Xue, Mianqiang; Li, Jia; Xu, Zhenming

    2012-03-01

    Metal-plated plastics (MPP), which are important from the standpoint of aesthetics or even performance, are increasingly employed in a wide variety of situations in the automotive industry. Serious environmental problems will be caused if they are not treated appropriately. Therefore, recycling of MPP is an important subject not only for resource recycling but also for environmental protection. This work represents a novel attempt to deal with the MPP. A self-designed hammer crusher was used to liberate coatings from the plastic substrate. The size distribution of particles was analyzed and described by the Rosin-Rammler function model. The optimum retaining time of materials in the crusher is 3 min. By this time, the liberation rate of the materials can reach 87.3%. When the density of the suspension is 31,250 g/m(3), the performance of liberation is the best. Two-step magnetic separation was adopted to avoid excessive crushing and to guarantee the quality of products. Concerning both the separation efficiency and grade of products, the optimum rotational speed of the magnetic separator is 50-70 rpm. On the basis of the above studies about the liberating and separating behavior of the materials, a continuous recycling system (the technology of crush-magnetic separation) is developed. This recycling system provides a feasible method for recycling MPP efficiently, economically, and environmentally. PMID:22304328

  18. Separation of species of a binary fluid mixture confined in a channel in presence of a strong transverse magnetic field

    Directory of Open Access Journals (Sweden)

    Sharma Bishwaram

    2012-01-01

    Full Text Available Effects of a transverse magnetic field on separation of a binary mixture of incompressible viscous thermally and electrically conducting fluids confined between two stationary parallel plates are examined. Both the plates are maintained at constant temperatures. It is assumed that one of the components, which is rarer and lighter, is present in the mixture in a very small quantity. The equations governing the motion, temperature and concentration in Cartesian coordinate are solved analytically. The solution obtained for concentration distribution is plotted against the width of the channel for various values of non-dimensional parameters. It is found that the effect of transverse magnetic field is to separate the species of rarer and lighter component by contributing its effect directly to the temperature gradient and the pressure gradient. The effects of increase in the values of Hartmann number, magnetic Reynolds number, barodiffusion number, thermal diffusion number, electric field parameter and the product of Prandtl number and Eckert number are to collect the rarer and lighter component near the upper plate and throw away the heavier component towards the lower plate. The problem discussed here derives its application in the basic fluid dynamics separation processes to separate the rare component of the different isotopes of heavier molecules where electromagnetic method of separation does not work.

  19. Development of a magnetic separation method to capture sepsis associated bacteria in blood.

    Science.gov (United States)

    Lopes, Ana Luisa Kalb; Cardoso, Josiane; Dos Santos, Fernanda Roberta Correa Cleto; Silva, Ana Claudia Graziani; Stets, Maria Isabel; Zanchin, Nilson Ivo Tonin; Soares, Maurilio José; Krieger, Marco Aurélio

    2016-09-01

    Bloodstream infections are important public health problems, associated with high mortality due to the inability to detect the pathogen quickly in the early stages of infection. Such inability has led to a growing interest in the development of a rapid, sensitive, and specific assay to detect these pathogens. In an effort to improve diagnostic efficiency, we present here a magnetic separation method for bacteria that is based on mutated lysozyme (LysE35A) to capture S. aureus from whole blood. LysE35A-coated beads were able to bind different MSSA and MRSA isolates in the blood and also other six Gram-positive and two Gram-negative species in whole blood. This system was capable to bind bacteria at low concentrations (10CFU/ml) in spiked blood. Samples captured with the mutated lysozyme showed more responsive amplification of the 16S gene than whole blood at concentrations of 10(3)-10(5)CFU. These data demonstrate detection of S. aureus directly in blood samples, without in vitro cultivation. Our results show that capture with LysE35A-coated beads can be useful to develop a point of care diagnostic system for rapid and sensitive detection of pathogens in clinical settings. PMID:27432342

  20. A Novel Magnetic Separation Oxygen-enriched Method and the Influence of Temperature and Magnetic Field on Enrichment

    Institute of Scientific and Technical Information of China (English)

    Li WANG; Jun CAI; Ping WU; Lige TONG; Shufeng SUN

    2007-01-01

    A novel oxygen-enriched method is presented. Using two opposite magnetic poles of two magnets with certain distance forms a magnetic space having a field intensity gradient near its borders. When air injected into the magnetic space outflows from the magnetic space via its borders, oxygen molecules in air will experience the interception effect of the gradient magnetic field, but nitrogen molecules will outflow without hindrance. Thereby the continuous oxygen enrichment is realized. The results show that the maximum increment of oxygen concentration reaches 0.49% at 298 K when the maximum product of magnetic flux density and field intensity gradient is 563T2/m. The enrichment level is significantly influenced by the gas temperature and the magnetic field. The maximum increment of oxygen concentration drops to 0.16% when the gas temperature rises to 343 K, and drops to 0.09% when the maximum product of magnetic flux density and gradient is reduced to 101 T2/m from 563T2/m.

  1. The synthesis, characterization and application of iron oxide nanocrystals in magnetic separations for arsenic and uranium removal

    Science.gov (United States)

    Mayo, John Thomas

    Arsenic and uranium in the environment are hazardous to human health and require better methods for detection and remediation. Nanocrystalline iron oxides offer a number of advantages as sorbents for water purification and environmental remediation. First, highly uniform and crystalline iron oxide nanocrystals (nMAG) were prepared using thermal decomposition of iron salts in organic solutions; for the applications of interest in this thesis, a central challenge was the adaptation of these conventional synthetic methods to the needs of low infrastructure and economically disadvantaged settings. We show here that it is possible to form highly uniform and magnetically responsive nanomaterials using starting reagents and equipment that are readily available and economical. The products of this approach, termed the 'Kitchen Synthesis', are of comparable quality and effectiveness to laboratory materials. The narrow size distributions of the iron oxides produced in the laboratory synthesis made it possible to study the size-dependence of the magnetic separation efficiency of nanocrystals; generally as the diameter of particles increased they could be removed under lower applied magnetic fields. In this work we take advantage of this size-dependence to use magnetic separation as a tool to separate broadly distributed populations of magnetic materials. Such work makes it possible to use these materials in multiplexed separation and sensing schemes. With the synthesis and magnetic separation studies of these materials completed, it was possible to optimize their applications in water purification and environmental remediation. These materials removed both uranium and arsenic from contaminated samples, and had remarkably high sorption capacities --- up to 12 wt% for arsenic and 30 wt% for uranium. The contaminated nMAG is removed from the drinking water by either retention in a sand column, filter, or by magnetic separation. The uranium adsorption process was also utilized

  2. Boundary-value problem for a counterrotating electrical discharge in an axial magnetic field. [plasma centrifuge for isotope separation

    Science.gov (United States)

    Hong, S. H.; Wilhelm, H. E.

    1978-01-01

    An electrical discharge between two ring electrodes embedded in the mantle of a cylindrical chamber is considered, in which the plasma in the anode and cathode regions rotates in opposite directions under the influence of an external axial magnetic field. The associated boundary-value problem for the coupled partial differential equations describing the azimuthal velocity and radial current-density fields is solved in closed form. The velocity, current density, induced magnetic induction, and electric fields are presented for typical Hartmann numbers, magnetic Reynolds numbers, and geometry parameters. The discharge is shown to produce anodic and cathodic plasma sections rotating at speeds of the order 1,000,000 cm/sec for conventional magnetic field intensities. Possible application of the magnetoactive discharge as a plasma centrifuge for isotope separation is discussed.

  3. Development of superconducting high gradient magnetic separation system for scale removal from feed-water in thermal power plant

    Energy Technology Data Exchange (ETDEWEB)

    Shibatani, Saori; Nakanishi, Motohiro; Mizuno, Nobumi [Osaka University, Osaka (Japan); and others

    2016-03-15

    A Superconducting High Gradient Magnetic Separation (HGMS) system is proposed for treatment of feed-water in thermal power plant. This is a method to remove the iron scale from feed-water utilizing magnetic force. One of the issues for practical use of HGMS system is to extend continuous operation period. In this study, we designed the magnetic filters by particle trajectory simulation and HGMS experiments in order to solve this problem. As a result, the quantity of magnetite captured by each filter was equalized and filter blockage was prevented. A design method of the magnetic filter was proposed which is suitable for the long-term continuous scale removal in the feed-water system of the thermal power plant.

  4. Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system

    International Nuclear Information System (INIS)

    The phase equilibria of Co–V binary system were experimentally investigated, and the magnetically induced phase separation in the fcc phase was observed in a Co/V diffusion couple. Based on previous research and present work, a thermodynamic reassessment in the Co–V binary system was carried out by means of the CALPHAD method. The calculated results are consistent with the experimental data. The metastable miscibility gap of the hcp phase in the Co–V binary system was thermodynamically calculated. According to the calculation, the Co–V thin films with three concentrations were designed and deposited by magnetron sputtering. The transmission electron microscope (TEM) results prove that the metastable phase separation in the hcp phase exists in the Co–V system. The determined magnetic properties of the thin films reveal that the values of coercivity and remanence ratio are function of V content. - Highlights: • The magnetically induced phase separation of (αfCo) + (αpCo) was determined. • A thermodynamic reassessment of the Co–V binary system has been carried out. • The phase separation in the (εfCo) was observed in the Co85V15 thin film. • The coercivity and remanence ratio of the thin films are function of V content

  5. Superconducting open-gradient magnetic separation for the pretreatment of radioactive or mixed waste vitrification feeds. 1997 annual progress report

    International Nuclear Information System (INIS)

    'Vitrification has been selected as a final waste form technology in the US for long-term storage of high-level radioactive wastes (HLW). However, a foreseeable problem during vitrification in some waste feed streams lies in the presence of elements (e.g., transition metals) in the HLW that may cause instabilities in the final glass product. The formation of spinel compounds, such as Fe3O4 and FeCrO4, results in glass phase separation and reduces vitrifier lifetime, and durability of the final waste form. A superconducting open gradient magnetic separation (OGMS) system maybe suitable for the removal of the deleterious transition elements (e.g. Fe, Co, and Ni) and other elements (lanthanides) from vitrification feed streams due to their ferromagnetic or paramagnetic nature. The OGMS systems are designed to deflect and collect paramagnetic minerals as they interact with a magnetic field gradient. This system has the potential to reduce the volume of HLW for vitrification and ensure a stable product. In order to design efficient OGMS and High gradient magnetic separation (HGMS) processes, a fundamental understanding of the physical and chemical properties of the waste feed streams is required. Using HLW simulant and radioactive fly ash and sludge samples from the Savannah River Technology Center, Rocky Flats site, and the Hanford reservation, several techniques were used to characterize and predict the separation capability for a superconducting OGMS system.'

  6. Study of the correlation of charge separation of the chiral magnetic effect in Relativistic Heavy-ion Collisions

    CERN Document Server

    Feng, Sheng-Qin; Sun, Fei; Zhong, Yang; Yin, Zhong-Bao

    2016-01-01

    It was pointed out that the Chiral Magnetic Effect is a process of charge separation with respect to the reaction plane. There is one kind of phenomenon of gauge field configurations with nonzero topological charge, which can be a sphaleron in the QCD vacuum. At high temperatures, one expects that the sphaleron process is a dominant process. One finds that left-handed quarks will become right-handed quarks, and right-handed quarks will remain right-handed in a region with negative topological charge. The strong magnetic field produced in relativistic heavy-ion collisions interacts with the magnetic moment of the quarks and locates the spins of quarks with positive (negative) electric charge to be parallel (anti-parallel) to the field direction. The Chiral Separation Effect is a similar effect in which the occurrence of a vector charge, e.g. electric charge, causes a separation of chiralities. We calculate the chiral separation effects during RHIC and LHC energy regions by studying the detailed chiral charge s...

  7. Progress in Study on Magnetically Separable Nanocatalysts%磁性纳米催化剂的研究进展

    Institute of Scientific and Technical Information of China (English)

    郭祖鹏; 郭莉; 师存杰; 焉海波

    2011-01-01

    介绍了磁性纳米催化剂的特性,综述了近年来磁性纳米催化剂在在氢化催化、加氢甲酰化催化、C-C键偶联反应催化、氧化和环氧化催化、酯化反应催化、缩合反应催化、烯烃复分解催化、光催化、生物催化等领域应用的研究进展,旨在探讨磁性纳米催化剂制备方法和应用领域,同时提出其应用过程中存在的问题,并对发展前景进行了展望.%Magnetically separable nanocatalysts have the magnetic sensitivity and the unique properties of nano-materials as well as those of catalytic materials. Compared to their parent catalysts in solution, the magnetically separable nanocatalyst not only allow facile separation and recycling of the catalyst under the extern magnetic field, but also keep their previous dynamic performance such as high activity and selectivity due to the body size under the nano meter scale. In this paper, the applications of magnetically separable nanocatalyst in hydrogenation, hydroformylation, C-C coupling reaction, oxidation and epoxidation, esterification, condensation reaction, olefin metathesis, photocatalysis and biocatalysis were reviewed. The problems and the direction of the further research were also put forwarded.

  8. APPLICATIONS OF MAGNETIC SEPARATION IN WASTE WATER TREATMENT%磁选技术在水污染治理中的应用

    Institute of Scientific and Technical Information of China (English)

    李建军; 朱金波; 张丽亭; 刘银

    2012-01-01

    Owing to their simple operation, broad application scope, high efficiency of separation, and little secondary pollution output, magnetic separation techniques have been applied more and more widely in waste water purification and water circulation use. In this paper, the recent development of the applied magnetic separations in waste water purification at home and abroad was reviewed. And at the same time, some new magnetic separation techniques for water treatment, including superconducting magnetic separation, magnetophoresis separation, magnetic seed separation, and magnetic field assisted membrane separation, were described in detail. The development direction of magnetic separation technology was discussed.%磁分选技术因其操作简单、分选能力强、应用范围广、不产生二次污染等特点,在污水净化、水资源循环利用等领域的应用日益增多.本文综述了近年来国内外磁选技术在水污染治理中的应用研究进展;同时对水治理磁分离新技术—超导磁选、磁泳分离、磁种-絮凝磁选、磁场辅助膜分离等作了介绍,并探讨了磁选技术的发展方向.

  9. A novel biosensor based on competitive SERS immunoassay and magnetic separation for accurate and sensitive detection of chloramphenicol.

    Science.gov (United States)

    Yang, Kang; Hu, Yongjun; Dong, Ning

    2016-06-15

    The accurate and sensitive detection of chloramphenicol (CAP) is particularly imperative to public health and safety. Here, we present a novel sensor for residual CAP detection based on competitive surface-enhanced Raman scattering (SERS) immunoassay and magnetic separation. In this nanosensor, functionalized Au nanoparticles (AuNPs) were labeled with the Raman reporter molecule (e.g. 4,4'-dipyridyl). With the addition of free CAP, a competitive immune reaction was initiated between free CAP and above AuNPs for conjugating with CAP antibody-modified magnetic nanoparticles (MNPs). Instead of the solid substrate, the antibody conjugated-magnetic beads were used as supporting materials and separation tools in the present sensor. With the aid of a magnet, the mixture was removed from the supernatant for concentration effects. This caused obvious change of SERS signal intensity obtained from supernatant. The SERS signals were collected from the supernatant directly, which made the SERS measurements more stable, repeatable and reliable. The proposed SERS-based magnetic immunosensor allows us to detect CAP in a fast, selective and sensitive (1.0 pg/mL) manner over a wide concentration range ( 1-1 × 10(4)pg/mL). In addition, these results demonstrate that this immunosensor holds great potential for the detection of antibiotics in real aquatic environment, which is crucial to our life. PMID:26866562

  10. Separation of radioimmunoassay in magnetic phase with particles prepared at the IPEN and its comparison with conventional methodologies

    International Nuclear Information System (INIS)

    In the present work two main objectives were chosen. The first was the preparation for the execution of the magnetic phase separation technique, useful for the radioimmunoassay as well as for the most modern and most efficient immunoradiometric assay. The second objective, of a theoretical-practical kind and directly linked to the first, was the realization of a study about the precision of the technique with synthesized products compared with imported products and with two liquid phase separation techniques: the second antibody and polyethyleneglycol (PEG). This analysis was performed with the help of precision profiles built according to R.P.Ekins' recommendations. (author)

  11. Simple analytical model for the magnetophoretic separation of superparamagnetic dispersions in a uniform magnetic gradient

    Science.gov (United States)

    Andreu, J. S.; Camacho, J.; Faraudo, J.; Benelmekki, M.; Rebollo, C.; Martínez, Ll. M.

    2011-08-01

    Magnetophoresis—the motion of magnetic particles under applied magnetic gradient—is a process of great interest in novel applications of magnetic nanoparticles and colloids. In general, there are two main different types of magnetophoresis processes: cooperative magnetophoresis (a fast process enhanced by particle-particle interactions) and noncooperative magnetophoresis (driven by the motion of individual particles in magnetic fields). In the case of noncooperative magnetophoresis, we have obtained a simple analytical solution which allows the prediction of the magnetophoresis kinetics from particle characterization data (size and magnetization). Our comparison with new experimental results shows good quantitative agreement. In addition, we show the existence of a universal curve onto which all experimental results should collapse after proper rescaling. The range of applicability of the analytical solution is discussed in light of the predictions of a magnetic aggregation model [Soft MatterJAPIAU1744-683X10.1039/c0sm01424a 7, 2336 (2011)].

  12. Graphene supported silver@silver chloride & ferroferric oxide hybrid, a magnetically separable photocatalyst with high performance under visible light irradiation

    Science.gov (United States)

    Zhong, Suting; Jiang, Wei; Han, Mei; Liu, Gongzong; Zhang, Na; Lu, Yue

    2015-08-01

    A stable magnetic separable plasmonic photocatalyst was successfully fabricated by grafting silver@silver chloride (Ag@AgCl) and ferroferric oxide (Fe3O4) nanoparticles on graphene sheets. The composite exhibited high activity degrading methylene blue (MB) and rhodamine B (RB) under visible light irradiation: decomposition 97.4% of MB in 100 min and 97.9% of RB in 120 min. The enhanced photocatalytic activities can be attributed to synergistic effect between Ag@AgCl and graphene: the effective charge transfer from Ag@AgCl to graphene thus promotes the separation of electron-hole pairs. Moreover, the excellent magnetic property gives a more convenient way to recycle the photocatalysts.

  13. Beam-energy dependence of charge separation along the magnetic field in Au+Au collisions at RHIC

    CERN Document Server

    Adamczyk, L; Agakishiev, G; Aggarwal, M M; Ahammed, Z; Alekseev, I; Alford, J; Anson, C D; Aparin, A; Arkhipkin, D; Aschenauer, E C; Averichev, G S; Banerjee, A; Beavis, D R; Bellwied, R; Bhasin, A; Bhati, A K; Bhattarai, P; Bichsel, H; Bielcik, J; Bielcikova, J; Bland, L C; Bordyuzhin, I G; Borowski, W; Bouchet, J; Brandin, A V; Brovko, S G; Bültmann, S; Bunzarov, I; Burton, T P; Butterworth, J; Caines, H; Sánchez, M Calderón de la Barca; Cebra, D; Cendejas, R; Cervantes, M C; Chaloupka, P; Chang, Z; Chattopadhyay, S; Chen, H F; Chen, J H; Chen, L; Cheng, J; Cherney, M; Chikanian, A; Christie, W; Chwastowski, J; Codrington, M J M; Contin, G; Cramer, J G; Crawford, H J; Cui, X; Das, S; Leyva, A Davila; De Silva, L C; Debbe, R R; Dedovich, T G; Deng, J; Derevschikov, A A; de Souza, R Derradi; Dhamija, S; di Ruzza, B; Didenko, L; Dilks, C; Ding, F; Djawotho, P; Dong, X; Drachenberg, J L; Draper, J E; Du, C M; Dunkelberger, L E; Dunlop, J C; Efimov, L G; Engelage, J; Engle, K S; Eppley, G; Eun, L; Evdokimov, O; Eyser, O; Fatemi, R; Fazio, S; Fedorisin, J; Filip, P; Finch, E; Fisyak, Y; Flores, C E; Gagliardi, C A; Gangadharan, D R; Garand, D; Geurts, F; Gibson, A; Girard, M; Gliske, S; Greiner, L; Grosnick, D; Gunarathne, D S; Guo, Y; Gupta, A; Gupta, S; Guryn, W; Haag, B; Hamed, A; Han, L-X; Haque, R; Harris, J W; Heppelmann, S; Hirsch, A; Hoffmann, G W; Hofman, D J; Horvat, S; Huang, B; Huang, H Z; Huang, X; Huck, P; Humanic, T J; Igo, G; Jacobs, W W; Jang, H; Judd, E G; Kabana, S; Kalinkin, D; Kang, K; Kauder, K; Ke, H W; Keane, D; Kechechyan, A; Kesich, A; Khan, Z H; Kikola, D P; Kisel, I; Kisiel, A; Koetke, D D; Kollegger, T; Konzer, J; Koralt, I; Kosarzewski, L K; Kotchenda, L; Kraishan, A F; Kravtsov, P; Krueger, K; Kulakov, I; Kumar, L; Kycia, R A; Lamont, M A C; Landgraf, J M; Landry, K D; Lauret, J; Lebedev, A; Lednicky, R; Lee, J H; LeVine, M J; Li, C; Li, W; Li, X; Li, Y; Li, Z M; Lisa, M A; Liu, F; Ljubicic, T; Llope, W J; Lomnitz, M; Longacre, R S; Luo, X; Ma, G L; Ma, Y G; Don, D M M D Madagodagettige; Mahapatra, D P; Majka, R; Margetis, S; Markert, C; Masui, H; Matis, H S; McDonald, D; McShane, T S; Minaev, N G; Mioduszewski, S; Mohanty, B; Mondal, M M; Morozov, D A; Mustafa, M K; Nandi, B K; Nasim, Md; Nayak, T K; Nelson, J M; Nigmatkulov, G; Nogach, L V; Noh, S Y; Novak, J; Nurushev, S B; Odyniec, G; Ogawa, A; Oh, K; Ohlson, A; Okorokov, V; Oldag, E W; Olvitt, D L; Pachr, M; Page, B S; Pal, S K; Pan, Y X; Pandit, Y; Panebratsev, Y; Pawlak, T; Pawlik, B; Pei, H; Perkins, C; Peryt, W; Pile, P; Planinic, M; Pluta, J; Poljak, N; Poniatowska, K; Porter, J; Poskanzer, A M; Pruthi, N K; Przybycien, M; Pujahari, P R; Putschke, J; Qiu, H; Quintero, A; Ramachandran, S; Raniwala, R; Raniwala, S; Ray, R L; Riley, C K; Ritter, H G; Roberts, J B; Rogachevskiy, O V; Romero, J L; Ross, J F; Roy, A; Ruan, L; Rusnak, J; Rusnakova, O; Sahoo, N R; Sahu, P K; Sakrejda, I; Salur, S; Sandweiss, J; Sangaline, E; Sarkar, A; Schambach, J; Scharenberg, R P; Schmah, A M; Schmidke, W B; Schmitz, N; Seger, J; Seyboth, P; Shah, N; Shahaliev, E; Shanmuganathan, P V; Shao, M; Sharma, B; Shen, W Q; Shi, S S; Shou, Q Y; Sichtermann, E P; Singaraju, R N; Skoby, M J; Smirnov, D; Smirnov, N; Solanki, D; Sorensen, P; Spinka, H M; Srivastava, B; Stanislaus, T D S; Stevens, J R; Stock, R; Strikhanov, M; Stringfellow, B; Sumbera, M; Sun, X; Sun, X M; Sun, Y; Sun, Z; Surrow, B; Svirida, D N; Symons, T J M; Szelezniak, M A; Takahashi, J; Tang, A H; Tang, Z; Tarnowsky, T; Thomas, J H; Timmins, A R; Tlusty, D; Tokarev, M; Trentalange, S; Tribble, R E; Tribedy, P; Trzeciak, B A; Tsai, O D; Turnau, J; Ullrich, T; Underwood, D G; Van Buren, G; van Nieuwenhuizen, G; Vandenbroucke, M; Vanfossen,, J A; Varma, R; Vasconcelos, G M S; Vasiliev, A N; Vertesi, R; Videbæk, F; Viyogi, Y P; Vokal, S; Vossen, A; Wada, M; Wang, F; Wang, G; Wang, H; Wang, J S; Wang, X L; Wang, Y; Webb, G; Webb, J C; Westfall, G D; Wieman, H; Wissink, S W; Witt, R; Wu, Y F; Xiao, Z; Xie, W; Xin, K; Xu, H; Xu, J; Xu, N; Xu, Q H; Xu, Y; Xu, Z; Yan, W; Yang, C; Yang, Y; Ye, Z; Yepes, P; Yi, L; Yip, K; Yoo, I-K; Yu, N; Zawisza, Y; Zbroszczyk, H; Zha, W; Zhang, J B; Zhang, J L; Zhang, S; Zhang, X P; Zhang, Y; Zhang, Z P; Zhao, F; Zhao, J; Zhong, C; Zhu, X; Zhu, Y H; Zoulkarneeva, Y; Zyzak, M

    2014-01-01

    Local parity-odd domains are theorized to form inside a Quark-Gluon-Plasma (QGP) which has been produced in high-energy heavy-ion collisions. The local parity-odd domains manifest themselves as charge separation along the magnetic field axis via the chiral magnetic effect (CME). The experimental observation of charge separation has previously been reported for heavy-ion collisions at the top RHIC energies. In this paper, we present the results of the beam-energy dependence of the charge correlations in Au+Au collisions at midrapidity for center-of-mass energies of 7.7, 11.5, 19.6, 27, 39 and 62.4 GeV from the STAR experiment. After background subtraction, the signal gradually reduces with decreased beam energy, and tends to vanish by 7.7 GeV. The implications of these results for the CME will be discussed.

  14. Beyond "turn-on" readout: from zero background to signal amplification by combination of magnetic separation and plasmon enhanced fluorescence.

    Science.gov (United States)

    Gong, Suqin; Xia, Yunsheng

    2016-08-11

    By magnetic separation and subsequent plasmon enhanced fluorescence, an assay platform with a signal output from completely "zero" background to fluorescence amplification is achieved, using quantum dots as reporters. So, it well breaks through the conventional "turn-on" strategy in both lower and upper limits. The sensitivity for hyaluronidase sensing is enhanced 10(4)-10(6) times as compared with previous fluorescence methods. PMID:27398675

  15. The Vlasov equation with strong magnetic field and oscillating electric field as a model for isotop resonant separation

    Directory of Open Access Journals (Sweden)

    Emmanuel Frenod

    2002-01-01

    Full Text Available We study the qualitative behavior of solutions to the Vlasov equation with strong external magnetic field and oscillating electric field. This model is relevant to the understanding of isotop resonant separation. We show that the effective equation is a kinetic equation with a memory term. This memory term involves a pseudo-differential operator whose kernel is characterized by an integral equation involving Bessel functions. The kernel is explicitly given in some particular cases.

  16. Upgrading of High-Aluminum Hematite-Limonite Ore by High Temperature Reduction-Wet Magnetic Separation Process

    OpenAIRE

    Xianlin Zhou; Deqing Zhu; Jian Pan; Yanhong Luo; Xinqi Liu

    2016-01-01

    The huge consumption of iron ores in China has attracted much attention to utilizing low grade complex iron resources, such as high-aluminum hematite-limonite ore, which is a refractory resource and difficult to upgrade by traditional physical concentration processes due to the superfine size and close dissemination of iron minerals with gangue minerals. An innovative technology for a high temperature reduction-magnetic separation process was studied to upgrade a high-aluminum iron ore assayi...

  17. The Application of High–Gradient Magnetic Separation to Water Treatment by Means of Chemically Precipitated Magnetite

    OpenAIRE

    Hencl, V.; Mucha, P.

    1994-01-01

    Conditions of high–gradient magnetic separation (HGMS) of chemically precipitated magnetite, prepared from a waste material of the titanium white production were studied. The magnetite was used as a sorption material for the treatment of water from the Vltava River. Detailed experimental research resulted in a proposal for a technology of water treatment, schematic description of which is presented. The results of HGMS of chemically precipitated magnetite together with those of water treatmen...

  18. Study on agglomeration-collected magnetic separation of ink%油墨的凝聚-磁选研究

    Institute of Scientific and Technical Information of China (English)

    郑其; 车小奎; 陈松; 陈伟东

    2011-01-01

    Agglomeration and magnetic separation of ink are investigated in the paper. Magnetite, sodium oleate and kerosene were added in waste ink pulp, which holds magnetite and nonmagnetic ink together through hydrophobic agglomeration. The agglomerates were then recovered through magnetic separation. The study indicates that sodium oleate and kerosene as the agglomeration reagents are the premise and guarantee for agglomeration of magnetite and ink, and magnetite as the magnetic seed ensures the magnetism of the agglomerate that can be used for magnetic separation. Ink agglomerate size and magnetism increased as a result of agglomeration. Ink recovery in magnetic product is 84.09%, when the experiment conditions are the ink density of 20% ,magnetite dosage of 2 g/L,sodium oleate dosage of 3 g/L, and kerosene dosage of 3 g/L, pH = 9,the agglomeration stir time of 20 min and the magnetic field intensity of 1 T.%进行了油墨凝聚、磁选的研究,在废油墨中添加磁铁矿、油酸钠和煤油,使磁铁矿和非磁性油墨通过疏水性凝聚粘附在一起,再用磁选回收.研究表明,油酸钠和煤油作为凝聚剂是磁铁矿与油墨凝聚的前提和保证,磁种磁铁矿的加入确保了聚团的磁性能用于磁选.凝聚增大油墨聚团粒度和磁性.在油墨浓度为200g/L、磁铁矿用量2g/L、油酸钠用量为3g/L、煤油用量3g/L、pH=9、凝聚搅拌时间20 min和磁场强度为1 T的条件下,油墨在磁性产品中的回收率为84.09%.

  19. Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators

    Science.gov (United States)

    Joshi, G.; Miller, R.; Ogden, L.; Kavand, M.; Jamali, S.; Ambal, K.; Venkatesh, S.; Schurig, D.; Malissa, H.; Lupton, J. M.; Boehme, C.

    2016-09-01

    Separating the influence of hyperfine from spin-orbit interactions in spin-dependent carrier recombination and dissociation processes necessitates magnetic resonance spectroscopy over a wide range of frequencies. We have designed compact and versatile coplanar waveguide resonators for continuous-wave electrically detected magnetic resonance and tested these on organic light-emitting diodes. By exploiting both the fundamental and higher-harmonic modes of the resonators, we cover almost five octaves in resonance frequency within a single setup. The measurements with a common π-conjugated polymer as the active material reveal small but non-negligible effects of spin-orbit interactions, which give rise to a broadening of the magnetic resonance spectrum with increasing frequency.

  20. Training effects induced by cycling of magnetic field in ferromagnetic rich phase-separated nanocomposite manganites

    Energy Technology Data Exchange (ETDEWEB)

    Das, Kalipada, E-mail: kalipada.das@saha.ac.in; Das, I.

    2015-12-01

    We have carried out an experimental investigation of magneto-transport and magnetic properties of charge-ordered Pr{sub 0.67}Ca{sub 0.33}MnO{sub 3} (PCMO) and ferromagnetic La{sub 0.67}Sr{sub 0.33}MnO{sub 3} (LSMO) nanoparticles along with a nanocomposite consisting of those two types of nanoparticles. From the magneto-transport measurements, clear irreversibility is observed in the field dependence of resistance due to magnetic field cycling in the case of PCMO nanoparticles. The value of resistance increases during such a field cycling. However such an irreversibility is absent in the case of LSMO nanoparticles as well as nanocomposites. On the other hand, the magnetic measurements indicate the gradual growth of antiferromagnetic phases in all samples leading to a decrease in magnetization. These inconsistencies between magneto-transport and magnetic behaviors are attributed to the magnetic training effects. - Highlights: • The resistance value in Pr{sub 0.67}Ca{sub 0.33}MnO{sub 3} nanoparticles is found to increase owing to the magnetic field cycling. • No anomaly in resistance was found in Pr{sub 0.67}Ca{sub 0.33}MnO{sub 3}–La{sub 0.67}Sr{sub 0.33}MnO{sub 3} nanocomposite. • Magnetic measurements indicate the training effect in nanostructure compounds.

  1. Optimization of Human Corneal Endothelial Cells for Culture: The Removal of Corneal Stromal Fibroblast Contamination Using Magnetic Cell Separation

    Directory of Open Access Journals (Sweden)

    Gary S. L. Peh

    2012-01-01

    Full Text Available The culture of human corneal endothelial cells (CECs is critical for the development of suitable graft alternative on biodegradable material, specifically for endothelial keratoplasty, which can potentially alleviate the global shortage of transplant-grade donor corneas available. However, the propagation of slow proliferative CECs in vitro can be hindered by rapid growing stromal corneal fibroblasts (CSFs that may be coisolated in some cases. The purpose of this study was to evaluate a strategy using magnetic cell separation (MACS technique to deplete the contaminating CSFs from CEC cultures using antifibroblast magnetic microbeads. Separated “labeled” and “flow-through” cell fractions were collected separately, cultured, and morphologically assessed. Cells from the “flow-through” fraction displayed compact polygonal morphology and expressed Na+/K+ATPase indicative of corneal endothelial cells, whilst cells from the “labeled” fraction were mostly elongated and fibroblastic. A separation efficacy of 96.88% was observed. Hence, MACS technique can be useful in the depletion of contaminating CSFs from within a culture of CECs.

  2. The effect of particle size and colloid stability on the wet high-intensity magnetic separation of uranium from cyanidation residues

    International Nuclear Information System (INIS)

    This report describes an experimental investigation on the magnetic separation of U3O8 from various size fractions of uranium-gold tailings. High recoveries were obtained at high grades, even from the finest fraction (smaller than 25μm), and an increase in magnetic field did not improve the efficiency of separation. The use of theoretical models did not lead to the correct prediction of the limiting particle size recoverable by magnetic separation. It was shown that the presence of coarse fractions enhances the recovery of uranium from a very fine fraction, and that 'piggy-back' magnetic separation plays an important role in the capture of slimes. The results also showed that the use of a dispersant considerably improves the selectivity of the separation

  3. Magnetic properties and loss separation in Fe76−xAgxNb2Si13B9 amorphous alloys

    International Nuclear Information System (INIS)

    Highlights: • Soft magnetic properties can be optimized by applying a suitable heat treatment. • Low field magnetic permeability of the optimized samples increases about 10 times. • Total magnetic loss of the optimized samples decreases at least 10 times. • Plasticity is much higher than that reported for similar nanocrystalline alloys. • Observed effects are attributed to formation of the relaxed amorphous phase. - Abstract: Some selected properties (magnetic, plastic, elastic) in amorphous Fe76−xAgxNb2Si13B9 (x = 0.5, 0.75, 1.0) alloys, obtained by melt spinning technique, are presented and discussed in detail. It was shown that a suitable heat treatment of the as quenched samples (i.e. the optimization annealing) leads to a significant improvement of soft magnetic properties (permeability increases at least 10 times). The observed effect is attributed to formation of the so-called relaxed amorphous phase free of iron nanograins. Special attention is paid for loss separation into different components: hysteresis loss, eddy-current loss and residual loss. The latter effect can be attributed to diffusion of free volume and practically disappear after the optimization annealing

  4. Magnetic properties and loss separation in FeSi/MnZnFe2O4 soft magnetic composites

    Science.gov (United States)

    Lauda, M.; Füzer, J.; Kollár, P.; Strečková, M.; Bureš, R.; Kováč, J.; Baťková, M.; Baťko, I.

    2016-08-01

    We investigated composites that have been prepared from FeSi powders covered with MnZnFe2O4 (MnZn ferrite), which was prepared by sol-gel synthesis accompanied with the auto-combustion process. The aim of this paper is to analyze the complex permeability and core losses of prepared samples with different amount of MnZn ferrite. The microstructure and the powder morphology were examined by scanning electron microscopy. Magnetic measurements on bulk samples were carried out using a vibrating sample magnetometer, an impedance analyzer and hysteresisgraphs. The results indicate that the composites with 2.6 wt% MnZn ferrite show better soft magnetic properties than the composites with about 6 wt% MnZn ferrite.

  5. Manipulation of magnetic phase separation and orbital occupancy in manganites by strain engineering and electric field

    Science.gov (United States)

    Cui, Bin; Song, Cheng; Pan, Feng; Key Laboratory of Advanced Materials (MOE) Team

    2015-03-01

    The modification of electronic phases in correlated oxides is one of the core issues of condensed matter. We report the reversible control of ferromagnetic phase transition in manganite films by ionic liquid gating, replicating the La1-xSrxMnO3 (LSMO) phase diagram. The formation and annihilation of an insulating and magnetically hard phase in the soft magnetic matrix, which randomly nucleates and grows across the film, is directly observed under different gate voltages (VG) . The realization of reversible metal-insulator transition in colossal magnetoresistance materials can lead to the development of four-state memories. The orbital occupancy and magnetic anisotropy of LSMO films are manipulated by VG in a reversible and quantitative manner. Positive and negative VG increases and reduces the occupancy of the orbital and magnetic anisotropy that were initially favored by strain (irrespective of tensile and compressive), respectively. This finding fills in the blank of electrical manipulation of four degrees of freedom in correlated system.

  6. Application of magnetic poly(styrene-glycidyl methacrylate) microspheres for immunomagnetic separation of bone marrow cells

    Energy Technology Data Exchange (ETDEWEB)

    Chung, T.-H.; Chang, J.-Y. [Department of Chemical Engineering, National Chung Cheng University, Chiayi 621, Taiwan (China); Lee, W.-C. [Department of Chemical Engineering, National Chung Cheng University, Chiayi 621, Taiwan (China)], E-mail: chmwcl@ccu.edu.tw

    2009-05-15

    Surface-functionalized magnetic poly(styrene-glycidyl methacrylate) (PS-GMA) microspheres were prepared and coupled with Sca-1 antibody for cell selection from murine bone marrow mononuclear cells (MNCs). Biotinylated Sca-1 antibody could be directly coupled to avidin-bound magnetic microspheres. Alternatively, oxidized goat anti-mouse antibody was covalently bound onto the amino group-containing magnetic microspheres in a site-directed manner, and the resultant conjugate was coupled with non-modified Sca-1 antibody. Using the indirect antibody-bound magnetic microspheres, the purity of isolated Sca-1{sup +} cells increased with bead-to-cell ratio. Using a bead-to-cell ratio of 10 beads/cell, a purity of 85% Sca-1{sup +} cells corresponding to a 17-fold enrichment was achieved.

  7. Application of magnetic poly(styrene-glycidyl methacrylate) microspheres for immunomagnetic separation of bone marrow cells

    International Nuclear Information System (INIS)

    Surface-functionalized magnetic poly(styrene-glycidyl methacrylate) (PS-GMA) microspheres were prepared and coupled with Sca-1 antibody for cell selection from murine bone marrow mononuclear cells (MNCs). Biotinylated Sca-1 antibody could be directly coupled to avidin-bound magnetic microspheres. Alternatively, oxidized goat anti-mouse antibody was covalently bound onto the amino group-containing magnetic microspheres in a site-directed manner, and the resultant conjugate was coupled with non-modified Sca-1 antibody. Using the indirect antibody-bound magnetic microspheres, the purity of isolated Sca-1+ cells increased with bead-to-cell ratio. Using a bead-to-cell ratio of 10 beads/cell, a purity of 85% Sca-1+ cells corresponding to a 17-fold enrichment was achieved.

  8. Application of magnetic poly(styrene-glycidyl methacrylate) microspheres for immunomagnetic separation of bone marrow cells

    Science.gov (United States)

    Chung, Ting-Hao; Chang, Jing-Yi; Lee, Wen-Chien

    2009-05-01

    Surface-functionalized magnetic poly(styrene-glycidyl methacrylate) (PS-GMA) microspheres were prepared and coupled with Sca-1 antibody for cell selection from murine bone marrow mononuclear cells (MNCs). Biotinylated Sca-1 antibody could be directly coupled to avidin-bound magnetic microspheres. Alternatively, oxidized goat anti-mouse antibody was covalently bound onto the amino group-containing magnetic microspheres in a site-directed manner, and the resultant conjugate was coupled with non-modified Sca-1 antibody. Using the indirect antibody-bound magnetic microspheres, the purity of isolated Sca-1 + cells increased with bead-to-cell ratio. Using a bead-to-cell ratio of 10 beads/cell, a purity of 85% Sca-1 + cells corresponding to a 17-fold enrichment was achieved.

  9. Electronic and magnetic phase separation in EuB6. Fluctuation spectroscopy and nonlinear transport

    International Nuclear Information System (INIS)

    The main topics of this thesis are electrical, stationary, and time-resolved transport measurements on EuB6 as well as the further development of measuring methods and analysis procedures of the fluctuation spectroscopy. The first part of this thesis was dedicated to the further development of the already known measuring methods under application of a fast data-acquisition card. The second part deals with the electrical transport properties of EuB6 and the understanding of the coupling between charge and magnetic degrees of freedom. By means of resistance and nonlinear-transport measurements as well as fluctuation spectroscopy hypotheses of other scientists were systematically verified as well as new knowledge obtained. The magnetoresistance was studied as function of the temperature in small external magnetic fields between 1 mT and 700 mT. Measurements of the third harmonic resistance as function of the temperature show maxima at TMI and TC. Electrical-resistance fluctuations were measured without external magnetic field between 5 and 100 K as well in presence of a magnetic field between 18 K and 32 K. At constant temperature measurements of the spectral power density in external magnetic fields were performed in the temperature range from 18 K to 32 K. Highly resolving measurements of the thermal expansion coefficient showed a very strong coupling of the magnetic (polaronic) degrees of freedom to the crystal lattice.

  10. Magnetization Roasting-Magnetic Separation on a Siderite Ore from Chongqing%重庆某菱铁矿石磁化焙烧-磁选试验

    Institute of Scientific and Technical Information of China (English)

    蔡新伟; 葛英勇; 瞿军

    2015-01-01

    In order to confirm the utilization scheme of a highly oxidized siderite ore from Chongqing Province,the exper-imental study of the magnetic roasting-grinding-low intensity magnetic separation process was carried out. Under the conditions of roasting temperature at 800 ℃ for 50 min,the consumption of coal of 10%,the grind fineness of roasted product for 88%passing 200 mesh,low intensity magnetic separation of magnetic field intensity of 119. 43 kA/m,low intensity magnetic concen-trate with iron grade of 58. 94%,and iron recovery of 76. 38% were obtained. After SiO2 ,the high contents of MgO,MnO and Al2 O3 in the weak magnetic separation concentrate are the factors that affect the iron grade of concentrate.%为了确定重庆某高度氧化的菱铁矿资源的开发利用方案,采用磁化焙烧—磨矿—弱磁选工艺进行了选矿试验。结果表明:在磁化焙烧温度为800℃、焙烧时间为50 min、配碳量为10%、磁化焙烧产物的磨矿细度为-200目占88%、弱磁选磁场强度为119.43 kA/m的情况下,可获得铁品位为58.94%、铁回收率为76.38%的弱磁选精矿;弱磁选精矿中Al2 O3、MgO、MnO的含量较高,是仅次于SiO2的影响精矿铁品位的因素,这些杂质有待后续反浮选试验脱除。

  11. Studies on density dependence of charge separation in a direct energy converter using slanted Cusp magnetic field

    International Nuclear Information System (INIS)

    In an advanced fusion, fusion-produced charged particles must be separated from each other for efficient energy conversion to electricity. The CuspDEC performs this function of separation and direct energy conversion. Analysis of working characteristics of CuspDEC on plasma density is an important subject. This paper summarizes and discusses experimental and theoretical works for high density plasma by using a small scale experimental device employing a slanted cusp magnetic field. When the incident plasma is low-density, good separation of the charged particles can be accomplished and this is explained by the theory based on a single particle motion. In high density plasma, however, this theory cannot be always applied due to space charge effects. In the experiment, as gradient of the field line increases, separation capability of the charged particles becomes higher. As plasma density becomes higher, however, separation capability becomes lower. This can be qualitatively explained by using calculations of the modified Störmer potential including space charge potential. (author)

  12. Preparation of magnetic molecularly imprinted polymer for the separation of tetracycline antibiotics from egg and tissue samples.

    Science.gov (United States)

    Chen, Ligang; Liu, Jun; Zeng, Qinglei; Wang, Hui; Yu, Aimin; Zhang, Hanqi; Ding, Lan

    2009-05-01

    Magnetic molecularly imprinted polymers were prepared using hydrophobic Fe(3)O(4) magnetite as the magnetically susceptible component, oxytetracycline as template molecule, methacrylic acid as functional monomer, and styrene and divinylbenzene as polymeric matrix components. The polymers were applied to the separation of tetracycline antibiotics from egg and tissue samples. The extraction and clean-up procedures were carried out in a single step by blending and stirring the sample, extraction solvent and polymers. The analytes can be transferred from the sample matrix to the polymers directly or through the extraction solvent as medium. When the extraction was complete, the polymers adsorbing the analytes were easily separated from the sample matrix by an adscititious magnet. The analytes eluted from the polymers were determined by liquid chromatography-tandem mass spectrometry. The recoveries ranging from 72.8% to 96.5% were obtained with relative standard deviations in the range of 2.9-12.3%. The limit of detection was less than 0.2 ng g(-1). The feasibility of this method was validated by analysis of incurred egg and tissue samples, and the results were compared with those obtained by the classical method in which solvent extraction, centrifugation, and subsequent clean-up and concentration by solid-phase extraction were applied. The proposed method reduced the complicacy of classical method and improved the reliability of method. PMID:19268956

  13. Design of a single magnet separator with mass resolving power m/Δm ≈/20,000

    Science.gov (United States)

    Breitenfeldt, Martin; Augustin, Mathieu; Catherall, Richard; Giles, Tim; Schoerling, Daniel; Tveten, Gry M.

    2016-06-01

    ISOLDE at CERN is a leading radioactive ion beam facility. With its upgrade, the HIE-ISOLDE project, an increase in primary beam intensity and energy is envisaged and the aim is a significant increase in intensity of the exotic beams. The high resolution separator (HRS) after the upgrade is required to suppress contaminations almost completely when the masses differ to the beam of interest by Δm / m > 1 / 20, 000 . Here a 120° magnet with a bending radius of 1.25 m has been chosen. The magnetic rigidity is 0.625 Tm (B-field of 0.5 T) to allow for separation of molecules of up to a mass of 300 u. The magnet comprises a yoke in wedged H-type configuration for stability and precision and pole face conductors for focusing and compensation of aberrations. The concept was derived analytically, refined with the OPERA 2D software and tested with the ray-tracing module of OPERA 3D.

  14. Upgrading of High-Aluminum Hematite-Limonite Ore by High Temperature Reduction-Wet Magnetic Separation Process

    Directory of Open Access Journals (Sweden)

    Xianlin Zhou

    2016-03-01

    Full Text Available The huge consumption of iron ores in China has attracted much attention to utilizing low grade complex iron resources, such as high-aluminum hematite-limonite ore, which is a refractory resource and difficult to upgrade by traditional physical concentration processes due to the superfine size and close dissemination of iron minerals with gangue minerals. An innovative technology for a high temperature reduction-magnetic separation process was studied to upgrade a high-aluminum iron ore assaying 41.92% Fetotal, 13.74% Al2O3 and 13.96% SiO2. The optimized results show that the final metal iron powder, assaying 90.46% Fetotal, was manufactured at an overall iron recovery of 90.25% under conditions as follows: balling the high aluminum iron ore with 15% coal blended and at 0.3 basicity, reducing the dried pellets at 1350 °C for 25 min with a total C/Fe mass ratio of 1.0, grinding the reduced pellets up to 95%, passing at 0.074 mm and magnetically separating the ground product in a Davis Tube at a 0.10-T magnetic field intensity. The metal iron powder can be used as the burden for an electric arc furnace (EAF. Meanwhile, the nonmagnetic tailing is suitable to produce ceramic, which mainly consists of anorthite and corundum. An efficient way has been found to utilize high-aluminum iron resources.

  15. Design study of a superconducting 120 inch-diameter magnetic matrix separator

    International Nuclear Information System (INIS)

    This paper reports that matrix separators with forced flow helium cooling can be built simpler and smaller. Thus eddy current losses otherwise occurring in a liquid helium bath container can be avoided

  16. Fingerprints of intrinsic phase separation: magnetically doped two-dimensional electron gas

    OpenAIRE

    Terletska, Hanna; Dobrosavljević, Vladimir

    2010-01-01

    In addition to Anderson and Mott localization, intrinsic phase separation has long been advocated as the third fundamental mechanism controlling the doping-driven metal-insulator transitions. In electronic system, where charge neutrality precludes global phase separation, it may lead to various inhomogeneous states and dramaticahttp://arxiv.org/submit/215787/metadata arXiv Submission metadatally affect transport. Here we theoretically predict the precise experimental signatures of such phase-...

  17. 磁致空气分离技术的研究进展%Progress in magnetic air separation technology

    Institute of Scientific and Technical Information of China (English)

    包士然; 张金辉; 张小斌; 唐媛; 张瑞平; 邱利民

    2015-01-01

    Main research progress in magnetic air separation field was systematically reviewed . As an emerging air separation technology , magnetic air separation technology (MAST ) utilizes magnetic susceptibility difference to separate oxygen and nitrogen .MAST can be divided into three kinds according to its structure:absorption type ,side diffusion type ,and ring type .Various MAST systems were formed by the combination and cascading of these structures .Key techniques and major applications of MAST were summarized . MAST has advantages of simple structure , easy pretreatment , and low energy consumption , w hich is suitable to low concentration oxygen production . Development trends and application prospect were illustrated .Combination of MAST with traditional cryogenic distillation or membrane separation has the potential to produce high purity oxygen , w hich can improve separation efficiency with low extra energy and financial cost .%系统回顾了磁致空气分离领域的主要研究进展,磁致空气分离是一种新兴的空气分离方法,它主要利用氧氮气体的磁化率差异实现分离。按照装置结构特点可以分为吸附富集法、轨迹偏转法、磁环法3种,通过不同方法的组合级联形成了形态多样的磁致分离系统。总结归纳了利用梯度磁场进行空气分离的技术要点及适用范围,磁致分离方法装置简单、预处理方便、能耗低,与传统分离方法相比,更适宜于低纯度氧气的生产。展望了磁致空气分离的发展趋势和应用前景,为了获得更高纯度的富氧空气,可以将磁致空气分离方法与传统低温精馏、膜分离方法有机结合,花费较少的代价来有效地提高传统方法的分离效率。

  18. Application of Graphene Oxide-MnFe2O4 Magnetic Nanohybrids as Magnetically Separable Adsorbent for Highly Efficient Removal of Arsenic from Water

    Science.gov (United States)

    Huong, Pham Thi Lan; Huy, Le Thanh; Phan, Vu Ngoc; Huy, Tran Quang; Nam, Man Hoai; Lam, Vu Dinh; Le, Anh-Tuan

    2016-05-01

    In this work, a functional magnetic nanohybrid consisting of manganese ferrite magnetic nanoparticles (MnFe2O4) deposited onto graphene oxide (GO) nanosheets was successfully synthesized using a modified co-precipitation method. The as-prepared GO-MnFe2O4 magnetic nanohybrids were characterized using x-ray diffraction, transmission electron microscopy, Fourier transformed infrared spectroscopy, and vibrating sample magnetometer measurements. Adsorption experiments were performed to evaluate the adsorption capacities and efficient removal of arsenic of the nanohybrid and compared with bare MnFe2O4 nanoparticles and GO nanosheets. Our obtained results reveal that the adsorption process of the nanohybrids was well fitted with a pseudo-second-order kinetic equation and a Freundlich isotherm model; the maximum adsorption capacity and removal efficiency of the nanohybrids obtained ~240.385 mg/g and 99.9% with a fast response of equilibrium adsorption time ~20 min. The larger adsorption capacity and shorter equilibrium time of the GO-MnFe2O4 nanohybrids showed better performance than that of bare MnFe2O4 nanoparticles and GO nanosheets. The advantages of reusability, magnetic separation, high removal efficiency, and quick kinetics make these nanohybrids very promising as low-cost adsorbents for fast and effective removal of arsenic from water.

  19. Model experiments for immunomagnetic elimination of leukemic cells from human bone marrow. Presentation of a novel magnetic separation system.

    Science.gov (United States)

    Gruhn, B; Häfer, R; Müller, A; Andrä, W; Danan, H; Zintl, F

    1991-11-01

    Optimal conditions for removing leukemic cells from human bone marrow with monoclonal antibodies (mAb) and magnetic immunobeads were investigated. Monodisperse 3 microns polystyrene microspheres containing magnetite were coated with affinity-purified rabbit antimouse IgG at 4 degrees C, pH 9.6 for 18 h. SKW-3 cells (T-CLL cell line) were marked with the supravital DNA stain Hoechst 33342, seeded into normal human bone marrow, and then incubated with the mAb CD1, CD6, and CD8 at 4 degrees C for 30 min. In preliminary experiments REH cells (cALL cells) and mouse anti-REH cell antibodies were used to find the most favorable conditions for the binding of magnetic beads to tumor cells. Optimal formation of cell-bead rosettes was achieved by rotating beads and tumor cells together at room temperature at a concentration of 1 x 10(7) cells/ml, a bead: tumor cell ratio of 100:1 and an incubation time of one hour. The novel magnetic separation apparatus consists of three polystyrene chambers connected by silicone rubber tubing. The chambers contain four steel inserts each equipped with 32 nickel wires, which are magnetized by permanent magnets in such a way that the inhomogeneous high gradient magnetic field could be established within the cell suspension containing the cells to be depleted. The fluid flow was established by a peristaltic pump. At a flow rate of 1.5 ml/min and a field strength of 160 kA/m, no beads could be detected in the purged marrow. A cocktail of the three mAb was more effective than any single antibody in forming bead-cell rosettes. Two sequential purging cycles were superior to one. The marrow recovered was highly viable as assessed by trypan blue dye exclusion and by growth of CFU-GM. PMID:1786986

  20. Influence of the separation procedure on the properties of magnetic nanoparticles: Gaining in vitro stability and T1-T2 magnetic resonance imaging performance.

    Science.gov (United States)

    Guldris, Noelia; Argibay, Bárbara; Kolen'ko, Yury V; Carbó-Argibay, Enrique; Sobrino, Tomás; Campos, Francisco; Salonen, Laura M; Bañobre-López, Manuel; Castillo, José; Rivas, José

    2016-06-15

    Ultrasmall superparamagnetic iron oxide nanoparticles (USPIOs) coated with polyacrylic acid (PAA) were synthesized by a hydrothermal method in gram-scale quantity and extensively characterized. Only the nanoparticles subjected to an additional centrifugation step showed narrow size distribution, high polymeric coverage, and ideal superparamagnetism. In addition to improved physico-chemical properties, these nanoparticles feature high stability in vitro as well as dual T1-T2 performance as contrast agents (CAs) for magnetic resonance imaging (MRI), highlighting the importance of the additional separation step in obtaining material with the desired properties. PMID:27038785

  1. Characteristics and Application of Vertical Ring High Gradient Magnetic Separator%LHGC-F型立环高梯度磁选机的特性及其应用

    Institute of Scientific and Technical Information of China (English)

    王兆连; 刘风亮; 贾洪利; 魏黎明; 曾亮亮; 王宝春; 田凌佳; 张金庆

    2013-01-01

    On the basis of LHGC-vertical ring high gradient magnetic separator which has been developed and used successfully, LHGC-F oil-water compound-coolimg vertical ring high gradient magnetic separator is also developed by Shandong Huate Magnet Technology Co., Ltd., and it was appraised at the provincial and ministerial level on July 2012. The coil of the magnetic separator is cooled by transform oil, and the oil is cooled by water, so the coil can reach fine cooling effect. Meantime, the two ends of coil are fitted with armour, it can avoid magnetic leakage, improve the utilization ratio of magnetic energy, the background field of the magnetic separator reachs 1.3T, and the magnetic separator has yet some other advantages, now the magnetic separator has been applied in the separations of nonmetallic minerals effectively.%在成功研制和应用强制油冷立环高梯度磁选机的基础上,华特又研制出第四代油水复合冷却立环高梯度磁选机,并于2012年7月初通过省部级鉴定.该磁选机线圈用油冷却,油又用水冷却,线圈达到良好的降温效果,同时在线圈两端加装铁铠,防止漏磁,提高磁能利用率,背景场强达到1.3T,因诸多优点而在非金属矿选矿成功应用.

  2. γ-Fe2O3:A magnetic separable catalyst for synthesis of 5-substituted 1H-tetrazoles from nitriles and sodium azide

    Institute of Scientific and Technical Information of China (English)

    Gang Qi; Yong Dai

    2010-01-01

    An efficient route for the synthesis of 5-substituted 1H-tetrazole via[2+3]cycloaddition of nitriles and sodium azide is reported using γ-Fe2O3 nanoparticles as a magnetic separable catalyst.Under optimized conditions,the moderate to good yields(71-95%)can be obtained.The catalyst can be easily separated by a magnet and reused for several circles.

  3. Investigation of Performances of Wet and Dry High-Intensity Magnetic Separators for concentration of Çatalca region quartzite

    OpenAIRE

    ESKİBALCI, Mehmet Faruk; UZUN, Nihal; ŞAHKULUBEY, Lale

    2013-01-01

    In this study, the effect of wet and dry high intensity magnetic separators on removal of iron minerals from quartzite ore obtained from a private company in the region of Akalan, Çatalca Istanbul was investigated in order to produce a product which can be used in glass industry. The chemical analysis of the sample showed that the sample is composed of 97,35% SiO2, 1,66% Al2O3, 0,16% Fe2O3, 0,13% TiO2, 0,07% MgO. Additionally, the mineralogical analysis of the sample indicated that the sample...

  4. Magnetic separation technology in water treatment%磁分离技术在水处理中的运用

    Institute of Scientific and Technical Information of China (English)

    李莎莉

    2015-01-01

    Magnetic separation technology has higher separate speed and efficiency. It is widely used in the food waste water treatment,oily wastewater treatment,the urban sewage treatment,printing and dyeing wastewater treatment of industrial waste water treatment.Along with the development of society,this technology is widening its fields in application, such as solid waste slag and fly ash.%磁分离技术具有分离速度快、效率高等特点,它已经应用于食品废水处理、含油废水处理、城市污水处理、印染废水处理等工业废水的处理,随着发展进步,该技术不断拓宽应用领域,如固体废弃物矿渣、粉煤灰。

  5. Current development status and trends of domestic magnetic separators%国内磁选机的发展现状和趋势

    Institute of Scientific and Technical Information of China (English)

    吕波; 骆振福

    2011-01-01

    磁选是矿物分选中不可或缺的一部分,而磁选机性能的好坏更是磁选流程中的关键性因素.介绍了近几年国内磁选设备的结构和生产实况,阐述了磁选机的实际现状以及发展趋势.伴随着磁性材料的不断更新和磁选工艺的日益发展,磁选机开始向永磁化和大型化的方向发展,同时为解决低品位、粒度细、磁性弱的矿物的选别开辟了新的道路.%Magnetic separation is the indispensable part of mineral separation, and the performance of mag netic separators is the key factor affecting the separating process. With the unceasing renewal of magnetic ma terials and the development of magnetic separation technology, magnetic separators have developed toward the direction of everlasting magnetization and large scale, which provides a new road for sperarating minerals with low grade, small grains and weak magnetism.

  6. CALCULATING SEPARATE MAGNETIC FREE ENERGY ESTIMATES FOR ACTIVE REGIONS PRODUCING MULTIPLE FLARES: NOAA AR11158

    International Nuclear Information System (INIS)

    It is well known that photospheric flux emergence is an important process for stressing coronal fields and storing magnetic free energy, which may then be released during a flare. The Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) captured the entire emergence of NOAA AR 11158. This region emerged as two distinct bipoles, possibly connected underneath the photosphere, yet characterized by different photospheric field evolutions and fluxes. The combined active region complex produced 15 GOES C-class, two M-class, and the X2.2 Valentine's Day Flare during the four days after initial emergence on 2011 February 12. The M and X class flares are of particular interest because they are nonhomologous, involving different subregions of the active region. We use a Magnetic Charge Topology together with the Minimum Current Corona model of the coronal field to model field evolution of the complex. Combining this with observations of flare ribbons in the 1600 Å channel of the Atmospheric Imaging Assembly on board SDO, we propose a minimization algorithm for estimating the amount of reconnected flux and resulting drop in magnetic free energy during a flare. For the M6.6, M2.2, and X2.2 flares, we find a flux exchange of 4.2 × 1020 Mx, 2.0 × 1020 Mx, and 21.0 × 1020 Mx, respectively, resulting in free energy drops of 3.89 × 1030 erg, 2.62 × 1030 erg, and 1.68 × 1032 erg.

  7. Inspection of magnetic elements using forces of separation from the pole

    Energy Technology Data Exchange (ETDEWEB)

    Zhuk, V.V.; Kalnin' , R.K.; Kuzin, S.B.; Polis, A.V.

    1988-07-01

    The magnetodynamic method of inspection based on the interaction between the inspected body and the source of the electromagnetic field can be used for large-scale verification of the quality of ferromagnetic components. This is carried out using the dependence of the magnetic forces acting on the component on the value of the inspected parameter (presence-absence or size of a slit, a cut-out, etc.). Examples of solving specific inspection problems and grading ferromagnetic components are given.

  8. Design of Countercurrent Separation of Ginkgo biloba Terpene Lactones by Nuclear Magnetic Resonance

    OpenAIRE

    Qiu, Feng; Friesen, Brent J.; McAlpine, James B.; Pauli, Guido F.

    2012-01-01

    Terpene lactones such as bilobalide, ginkgolides A, B, C, and J are major bioactive compounds of Ginkgo biloba L. Purification of these compounds is tedious due to their similar chemical properties. For the purpose of developing an effective and efficient method for both analytical and preparative separation of terpene lactones in G. biloba, an innovative orthogonality-enhanced high-speed countercurrent chromatography (HSCCC) method was established. Taking advantage of quantitative 1H NMR (qH...

  9. Phase separation instabilities and magnetism in two dimensional square and honeycomb Hubbard model

    International Nuclear Information System (INIS)

    The variational cluster approximation is applied to rigorously calculate intrinsic local electron correlations in bipartite square and honeycomb Hubbard lattices. The Mott–Hubbard gap at half filling is manifested by a smooth metal–insulator transition in both lattices in agreement with the generic two-dimensional phase diagram. However, a density variation with the chemical potential shows the distinct structural differences away from half filling. The square lattice exhibits electron density discontinuity accompanied with spontaneous transition from antiferromagnetic Mott–Hubbard insulator into nonmagnetic metal. The spectral density anomaly and spin susceptibility peaks also are signaling on coexistence of hole rich metallic and hole poor insulating regions. In contrast, honeycomb lattice does not show density anomaly but displays a smooth transition with continuous evolution of a homogenous metallic state. These calculations provide strong evidence for spontaneous phase separation instability found in our quantum cluster calculations at moderate U - Highlights: • Variational cluster approximation (VCA) captures phase separation in various lattices under doping. • The conditions are formulated for continuous and discontinuous transitions. • Discontinuous phase separation is found in square lattices under doping and pressure. • Honeycomb lattice displays continuous evolution of a homogenous metallic state. • Spectral function anomaly in square geometry displays the folding of the first Brillouin zone

  10. LHGC - vertical Ring High Gradient Magnetic Separator and Its Use in Feldstar Mineral Separation%LHGC型立环高梯度磁选机及其在陶瓷原料长石矿分选中的应用

    Institute of Scientific and Technical Information of China (English)

    刘梅; 刘风亮; 王建波

    2012-01-01

    LHGC-vertical ring high gradient magnetic separator is developed and made by Shandong Huate Magnetism Technology magnetic separator. The magnetic separation equipment was expertized by 9 experts in SOU ,fhe experts unanimously thought:this is a initiating magnetic separation equipment at home and abroad,its technical performance has achieved the word leading level. The mag-netic separator can be extensively used to process metalic mineral and nonmetalic mineral, especially is suitable to ihe separation of class taws as quarz and feldspar,and has got fine technical index and notable economic benefit.%我公司开发生产的LHGC型高梯度磁选机是一种节能、环保、有强制油冷却、有脉动作用的新型立环高梯度磁选机.该磁选设备已于2011年由9位专家做了技术鉴定.专家一致认为,这是一种国内外首创的磁选设备,其技术性能达到了国际领先水平,该磁选设备可以广泛地应用于金属矿物和非金属矿物的分选,尤其适用于陶瓷原料长石矿物的除铁提纯,长石经除铁提纯后其技术指标达到优良,经济效益十分显著.

  11. 基于水处理的磁分离技术研究进展%Progress in magnetic separation technology research for water treatment

    Institute of Scientific and Technical Information of China (English)

    班云霄; 李得花

    2012-01-01

    Magnetic separation technology has particular separation principles,having good economical and practical value in water treatment field. With the development of superconducting magnetic materials, plasma technology, catalytic modification technology,bio-technology,etc., magnetic separation technology has widely been applied to water treatment. The research status quo about magnetic seeds and magnetic separation technology is reviewed, its application to water treatment is summarized briefly, and the prospect of magnetic separation technology is discussed.%磁分离技术具有独特的分离原理,在水处理领域中具有较好的经济性和实用价值.随着超导磁材、等离子体技术、催化改性技术、生物技术等的发展,磁分离技术已在水处理领域获得广泛应用.对磁种、磁分离工艺的研究现状进行综述,并简述其在水处理行业的应用情况,探讨了磁分离技术未来的应用前景.

  12. Mass magnetophoretic experiment applied to the separation of biocompatible magnetic nanoparticles with potential for magnetohyperthermia

    International Nuclear Information System (INIS)

    A mass magnetophoretic experiment was developed to segregate nanoparticles according to their diameter and size dispersion. The samples were synthesized by the coprecipitation method and characterized using x-ray diffraction, high-resolution transmission electron microscopy and vibrating sample magnetometry. The mean diameter (standard deviation) showed a decrease of nanoparticle size (size dispersion) in the surface of the magnetic fluid sample submitted to the magnetophoretic experiment. Those effects were monitored by time-dependent apparent mass variation data, which could be important for scale-up applications. Magnetohyperthemia experiments were also performed, confirming our findings. (paper)

  13. The Utilization of the Tailings From Wet Magnetic Separation at the Krivoy Rog Gok

    OpenAIRE

    Khvatov, U. A.; Armashova, Z. P.; Maly, V. M.; Gardash, N. K.; Kolos, V. P.; Knyazhitsky, Yu. A.; Kaptilaya, L. V.; Sheludko, V. P.

    1995-01-01

    A new technique of beneficiation of tailings from the Krivoy Rog magnetite ore is described. By employing a high–intensity separator, the iron–rich and iron–poor products are obtained. These products can be used in building industry: the iron-rich fraction can be used as a correction component of a raw material in the production of the portland cement clinker, as a replacement for the pyrite cinder. The iron–poor product can be used for the manufacture of bricks and other building materials....

  14. Magnetizing Roasting and Magnetic Separation of Specularite Ore%某镜铁矿石焙烧磁选试验研究

    Institute of Scientific and Technical Information of China (English)

    李萌; 白丽梅; 王学涛; 张晓亮; 刘淑贤

    2014-01-01

    新疆某镜铁矿石含TFe 35%,P 0.021%,S 0.012%,矿石中部分镜铁矿以细粒和微细粒的状态与隐晶质细粒的碳酸盐混杂构成细粒隐晶质结构,属难选矿石。对其进行了实验室磁化焙烧弱磁选试验。结果表明,将-2 mm原矿与煤粉按100砄12质量比(煤配比100砄12)混合,在焙烧温度800℃,焙烧时间为75 min的条件下焙烧,焙烧后细磨至-0.074 mm占90%,在磁场强度均为120 kA/m条件下进行两段弱磁选,可获得铁精矿品位65.95%、回收率77.70%的技术指标。该工艺技术为我国镜铁矿的开发利用提供了参考。%The iron content in a Xinjiang specularite was 35%, and the impurities of phosphorus and sulfur were 0.024%and 0.011%respectively.Part of the specularite occurred as fine and mi-cro-fine, and formed fine cryptocrystalline structure with the cryptocrystalline fine carbonate .La-boratory tests of magnetic roasting -low intensity magnetic separation were carried out with the run-of-mine.The sample(-2mm) was mixed with coal powder with a mass ratio of 100:12 and roasted at temperature of 800 ℃for 75 min.The as-roasted product was ground to -0.074 mm 90%, and then separated twice by low intensity magnetic separator at 120 kA/m.A concentrate with iron grade of 65 .95%and recovery of 77 .70%was obtained .

  15. Cryo magnetic separation adaptation to environment technologies: application to industrial effluents; Adaptation de la separation cryomagnetique aux technologies de l`environnement: application a l`epuration d`effluents liquides industriels

    Energy Technology Data Exchange (ETDEWEB)

    Bureau, V.

    1993-12-20

    Cryomagnetic separation adaptation to environment technologies application to industrial liquid effluents. The performance, obtained by superconducting high filed - high gradient magnetic separation, permitted to foresee the magnetic treatment of heavy metals in rinse waters, derived from the surface finishing industry. The paramagnetic ions, precipitated in basic media as hydroxides, present a very hydrated amorphous structure, which masks their subjacent magnetic properties. Coprecipitation of a `magnetic carrier`, jointly with the heavy metals, has been studied: ferric chloride forms in basic media, an hydrated iron oxide. Its structure is of the goethite type, and it stabilizes as hematite. The magnetic susceptibility of the obtained product is still weak and its crystalline structure is not enough affirmative to utilize magnetic filtration with efficiency. Mixture of ferrous sulphate and ferric chloride forms, in a basic media, an hydrated magnetite. Initial ideal ratio between divalent iron and trivalent iron, varies between 0,5 and 1,2. This mixture, coprecipitated with the heavy metals, permits to optimize the magnetic cleaning of the fluids in a high field - high gradient filter. (author)

  16. Process of Self-magnetization, Hydrophobic Flocculation and Magnetic Separation of Fine Weak-magnetic Iron Minerals%细粒弱磁性铁矿物自磁化-疏水絮凝-磁选研究

    Institute of Scientific and Technical Information of China (English)

    伍喜庆; 戴川; 戴亮

    2015-01-01

    利用菱铁矿在碱性溶液中的溶解特性,无需添加任何铁离子,通过控制矿浆pH值、反应温度、搅拌速度和时间等因素实现菱铁矿自磁化及其对赤铁矿的协同磁化作用,使弱磁性铁矿物能被选择性磁选回收。为加强细粒的回收,考察了六偏磷酸钠用量、非极性油(煤油)用量、油酸钠用量、煤油用量与油酸钠用量比、搅拌速度等因素对疏水絮凝⁃磁选的影响,结果表明,通过自磁化和疏水絮凝的联合作用,含Fe 42.35%的细粒(-0.038 mm)人工混合矿经0.35 T高梯度磁选机一次磁选可获得Fe品位61.30%、铁回收率90.92%的铁精矿。与其它磁选方法相比,自磁化⁃疏水絮凝⁃磁选流程处理含菱铁矿的细粒弱磁性混合铁矿石,分选效果较好。%Utilizing the solubility characteristics of siderite in alkaline solution, surface self⁃magnetization of fine siderite and its synergic magnetization on hematite can be actualized by adjusting parameters such as pulp pH, reaction temperature, reaction time and stirring speed without adding any iron ions, resulting in a selective recovery of these weak⁃magnetic iron minerals. To promote the recovery of fine minerals, hydrophobic flocculation⁃magnetic separation in combination with self⁃magnetization was investigated in terms of some variables such as dosages of sodium hexametaphosphate, kerosene and sodium oleate, the ratio of kerosene to sodium oleate as well as the stirring speed. Results showed an iron concentrate with iron grade and recovery of 61. 30% and 90. 92%, respectively, was obtained from the artificial ore with fineness of -0. 038 mm and iron grade of 42. 35% by a one⁃stage separation using a high gradient magnetic separator with the magnetic induction intensity of 0.35 T. In comparison with other magnetic separation techniques, the flowsheet of self⁃magnetization, hydrophobic flocculation, magnetic separation

  17. Levitation Performance of Two Opposed Permanent Magnet Pole-Pair Separated Conical Bearingless Motors

    Science.gov (United States)

    Kascak, Peter; Jansen, Ralph; Dever, Timothy; Nagorny, Aleksandr; Loparo, Kenneth

    2013-01-01

    In standard motor applications, rotor suspension with traditional mechanical bearings represents the most economical solution. However, in certain high performance applications, rotor suspension without contacting bearings is either required or highly beneficial. Examples include applications requiring very high speed or extreme environment operation, or with limited access for maintenance. This paper expands upon a novel bearingless motor concept, in which two motors with opposing conical air-gaps are used to achieve full five-axis levitation and rotation of the rotor. Force in this motor is created by deliberately leaving the motor s pole-pairs unconnected, which allows the creation of different d-axis flux in each pole pair. This flux imbalance is used to create lateral force. This approach is different than previous bearingless motor designs, which require separate windings for levitation and rotation. This paper examines the predicted and achieved suspension performance of a fully levitated prototype bearingless system.

  18. Engineering Application of Magnetic Separation Technology%磁分离技术的工程应用实践

    Institute of Scientific and Technical Information of China (English)

    邓大鹏; 董惠芳; 李大功; 李艳芳

    2011-01-01

    随着国家对水资源环境保护以及水资源严重不足引起的各种问题的日益重视,污水处理厂的处理标准逐年提高,由曾经的重质量逐渐演变到目前的质与量要同步提高.磁分离应急技术就是针对此问题而提出的.由于其高效的处理污水能力,已成为目前污水处理领域的热点之一.就磁分离应急技术在北京清河污水处理厂的实际应用情况作简单介绍,阐述其工作原理和今后需要解决的问题.%With national increasing attention to environmental protection of water resources and to a variety of questions caused by serious shortage of water resources, wastewater treatment standards for wastewater treatment plants are improved year by year, from the quality over quantity to the current quality and quantity. Magnetic separation technology for emergency is put forward for this situation. Because of its highly efficient wastewater treatment capacity, it has become one of the hot topics in wastewater treatment. The practical application of magnetic separation technology at Beijing Qinghe WWTP is introduced. The principle of the technology and problems needing to be solved are expounded.

  19. Colorimetric aptasensing of ochratoxin A using Au@Fe3O4 nanoparticles as signal indicator and magnetic separator.

    Science.gov (United States)

    Wang, Chengquan; Qian, Jing; Wang, Kun; Yang, Xingwang; Liu, Qian; Hao, Nan; Wang, Chengke; Dong, Xiaoya; Huang, Xingyi

    2016-03-15

    Gold nanoparticles (Au NPs) doped Fe3O4 (Au@Fe3O4) NPs have been synthesized by a facile one-step solvothermal method. The peroxidase-like activity of Au@Fe3O4 NPs was effectively enhanced due to the synergistic effect between the Fe3O4 NPs and Au NPs. On this basis, an efficient colorimetric aptasensor has been developed using the intrinsic dual functionality of the Au@Fe3O4 NPs as signal indicator and magnetic separator. Initially, the amino-modified aptamer specific for a typical mycotoxin, ochratoxin A (OTA), was surface confined on the amino-terminated glass beads surafce using glutaraldehyde as a linker. Subsequently, the amino-modified capture DNA (cDNA) was labeled with the amino-functionalized Au@Fe3O4 NPs and the aptasensor was thus fabricated through the hybridization reaction between cDNA and the aptamers. While upon OTA addition, aptamers preferred to form the OTA-aptamer complex and the Au@Fe3O4 NPs linked on the cDNA were released into the bulk solution. Through a simple magnetic separation, the collected Au@Fe3O4 NPs can produce a blue colored solution in the presence of 3,3',5,5'-tetramethylbenzidine and H2O2. When the reaction was terminated by addition of H(+) ions, the blue product could be changed into a yellow one with higher absorption intensity. This colorimetric aptasensor can detect as low as 30 pgmL(-1) OTA with high specificity. To the best of our knowledge, the present colorimetric aptasensor is the first attempt to use the peroxidase-like activity of nanomaterial for OTA detection, which may provide an acttractive path toward routine quality control of food safety. PMID:26583358

  20. GRM crustal magnetic anomalies: Separating the Lord Howe Rise and Norfolk Ridge submarine structures

    Science.gov (United States)

    Frey, H.

    1985-01-01

    Multiple source bodies often lie within the resolution element of the MAGSAT and POGO data. Small weak sources lying near larger stronger sources will tend to be missed, although they do contribute to the total observed anomaly. Lower elevation magnetic anomaly surveys such as GRM alleviate this problem through the combined effects of significantly greater resolution and stronger signal amplitude. This permits the detection of smaller source bodies, and analysis of their structure and nature. The improvement a GRM will provide is demonstrated in the Lord Howe Rise/Norfolk Ridge area east of Australia, between the Tasman Sea and south Fiji Basin. The submarine features origin have important plate tectonic implications. The Lord Howe Rise (LHR) is a continental fragment broken off from Australia by the opening of the Tasman Sea. It is a wide, shallow structure lying between 160 and 165 deg longitude at 23 to 37 deg S latitude. Seismic refraction data show the LHR crust extending to depths in excess of 20 km.

  1. Recovery of iron from high phosphorus oolitic iron ore using coal-based reduction followed by magnetic separation

    Science.gov (United States)

    Sun, Yong-sheng; Han, Yue-xin; Gao, Peng; Wang, Ze-hong; Ren, Duo-zhen

    2013-05-01

    Oolitic iron ore is one of the most important iron resources. This paper reports the recovery of iron from high phosphorus oolitic iron ore using coal-based reduction and magnetic separation. The influences of reduction temperature, reduction time, C/O mole ratio, and CaO content on the metallization degree and iron recovery were investigated in detail. Experimental results show that reduced products with the metallization degree of 95.82% could be produced under the optimal conditions (i.e., reduction temperature, 1250°C; reduction time, 50 min; C/O mole ratio, 2.0; and CaO content, 10wt%). The magnetic concentrate containing 89.63wt% Fe with the iron recovery of 96.21% was obtained. According to the mineralogical and morphologic analysis, the iron minerals had been reduced and iron was mainly enriched into the metallic iron phase embedded in the slag matrix in the form of spherical particles. Apatite was also reduced to phosphorus, which partially migrated into the metallic iron phase.

  2. A rapid method for detection of genetically modified organisms based on magnetic separation and surface-enhanced Raman scattering.

    Science.gov (United States)

    Guven, Burcu; Boyacı, İsmail Hakkı; Tamer, Ugur; Çalık, Pınar

    2012-01-01

    In this study, a new method combining magnetic separation (MS) and surface-enhanced Raman scattering (SERS) was developed to detect genetically modified organisms (GMOs). An oligonucleotide probe which is specific for 35 S DNA target was immobilized onto gold coated magnetic nanospheres to form oligonucleotide-coated nanoparticles. A self assembled monolayer was formed on gold nanorods using 5,5'-dithiobis (2-nitrobenzoic acid) (DTNB) and the second probe of the 35 S DNA target was immobilized on the activated nanorod surfaces. Probes on the nanoparticles were hybridized with the target oligonucleotide. Optimization parameters for hybridization were investigated by high performance liquid chromatography. Optimum hybridization parameters were determined as: 4 μM probe concentration, 20 min immobilization time, 30 min hybridization time, 55 °C hybridization temperature, 750 mM buffer salt concentration and pH: 7.4. Quantification of the target concentration was performed via SERS spectra of DTNB on the nanorods. The correlation between the target concentration and the SERS signal was found to be linear within the range of 25-100 nM. The analyses were performed with only one hybridization step in 40 min. Real sample analysis was conducted using Bt-176 maize sample. The results showed that the developed MS-SERS assay is capable of detecting GMOs in a rapid and selective manner.

  3. Processing and size range separation of pristine and magnetic poly(l-lactic acid) based microspheres for biomedical applications.

    Science.gov (United States)

    Correia, D M; Sencadas, V; Ribeiro, C; Martins, P M; Martins, P; Gama, F M; Botelho, G; Lanceros-Méndez, S

    2016-08-15

    Biodegradable poly(l-lactic acid) (PLLA) and PLLA/CoFe2O4 magnetic microspheres with average sizes ranging between 0.16-3.9μm and 0.8-2.2μm, respectively, were obtained by an oil-in-water emulsion method using poly(vinyl alcohol) (PVA) solution as the emulsifier agent. The separation of the microspheres in different size ranges was then performed by centrifugation and the colloidal stability assessed at different pH values. Neat PLLA spheres are more stable in alkaline environments when compared to magnetic microspheres, both types being stable for pHs higher than 4, resulting in a colloidal suspension. On the other hand, in acidic environments the microspheres tend to form aggregates. The neat PLLA microspheres show a degree of crystallinity of 40% whereas the composite ones are nearly amorphous (17%). Finally, the biocompatibility was assessed by cell viability studies with MC3T3-E1 pre-osteoblast cells. PMID:27209393

  4. Separating spatial and temporal variations in auroral electric and magnetic fields by Cluster multipoint measurements

    Directory of Open Access Journals (Sweden)

    T. Karlsson

    2004-07-01

    Full Text Available Cluster multipoint measurements of the electric and magnetic fields from a crossing of auroral field lines at an altitude of 4RE are used to show that it is possible to resolve the ambiguity of temporal versus spatial variations in the fields. We show that the largest electric fields (of the order of 300mV/m when mapped down to the ionosphere are of a quasi-static nature, unipolar, associated with upward electron beams, stable on a time scale of at least half a minute, and located in two regions of downward current. We conclude that they are the high-altitude analogues of the intense return current/black auroral electric field structures observed at lower altitudes by Freja and FAST. In between these structures there are temporal fluctuations, which are shown to likely be downward travelling Alfvén waves. The periods of these waves are 20-40s, which is not consistent with periods associated with either the Alfvénic ionospheric resonator, typical field line resonances or substorm onset related Pi2 oscillations. The multipoint measurements enable us to estimate a lower limit to the perpendicular wavelength of the Alfvén waves to be of the order of 120km, which suggests that the perpendicular wavelength is similar to the dimension of the region between the two quasi-static structures. This might indicate that the Alfvén waves are ducted within a wave guide, where the quasi-static structures are associated with the gradients making up this waveguide.

  5. Magnetic-optical nanohybrids for targeted detection, separation, and photothermal ablation of drug-resistant pathogens.

    Science.gov (United States)

    Ondera, Thomas J; Hamme, Ashton T

    2015-12-01

    A rapid, sensitive and quantitative immunoassay for the targeted detection and decontamination of E. coli based on Fe3O4 magnetic nanoparticles (MNPs) and plasmonic popcorn-shaped gold nanostructure attached single-walled carbon nanotubes (AuNP@SWCNT) is presented. The MNPs were synthesized as the support for a monoclonal antibody (mAb@MNP). E. coli (49979) was captured and rapidly preconcentrated from the sample with the mAb@MNP, followed by binding with Raman-tagged concanavalin A-AuNP@SWCNTs (Con A-AuNP@SWCNTs) as detector nanoprobes. A Raman tag 5,5'-dithiobis-(2-nitrobenzoic acid) (DTNB) generated a Raman signal upon 670 nm laser excitation enabling the detection and quantification of E. coli concentration with a limit of detection of 10(2) CFU mL(-1) and a linear logarithmic response range of 1.0 × 10(2) to 1.0 × 10(7) CFU mL(-1). The mAb@MNP could remove more than 98% of E. coli (initial concentration of 1.3 × 10(4) CFU mL(-1)) from water. The potential of the immunoassay to detect E. coli bacteria in real water samples was investigated and the results were compared with the experimental results from the classical count method. There was no statistically significant difference between the two methods (p > 0.05). Furthermore, the MNP/AuNP@SWCNT hybrid system exhibits an enhanced photothermal killing effect. The sandwich-like immunoassay possesses potential for rapid bioanalysis and the simultaneous biosensing of multiple pathogenic agents. PMID:26469636

  6. Separation and purification of Si from solidification of hypereutectic Al-Si melt under rotating magnetic field

    Science.gov (United States)

    Jie, J. C.; Zou, Q. C.; Wang, H. W.; Sun, J. L.; Lu, Y. P.; Wang, T. M.; Li, T. J.

    2014-08-01

    A low-cost and high-efficiency method to purify Si directly from cheap MG-Si at low temperature was proposed and demonstrated in this paper, which used power frequency rotating magnetic field (RMF) to separate the primary Si from a hypereutectic Al-Si alloy and was followed by the acid peeling. The separation mechanism was based on the flow characteristic of melt under RMF and the cooling condition of the liquid metal. A Si-rich layer with Si content of 65-59 wt% was formed in the periphery of alloy, while the inner microstructure of the alloy was mainly the Al-Si eutectic structure. The refined silicon was collected after aqua regia leaching, and had much fewer typical impurities (Fe, Ti, Ca, B, P) than those in MG-Si, and the metallic impurities besides Al had removal fraction higher than 98%, which is mainly ascribed to the segregation effect of Al-30Si alloy during solidification under RMF.

  7. Signature of magnetic phase separation in the ground state of Pr1-xCaxMnO3

    Energy Technology Data Exchange (ETDEWEB)

    Sha, Hao [Florida International University, Miami; Ye, Feng [ORNL; Dai, Pengcheng [ORNL; Fernandez-Baca, Jaime A [ORNL; Mesa, Dalgis [ORNL; Lynn, J. W. [National Institute of Standards and Technology (NIST); Tomioka, Y. [Correlated Electron Research Center (CERC), Japan; Tokura, Y. [University of Tokyo, Tokyo, Japan; Zhang, Jiandi [Florida International University, Miami

    2008-01-01

    Neutron scattering has been used to investigate the evolution of the long- and short-range charge-ordered (CO), ferromagnetic (FM), and antiferromagnetic (AF) correlations in single crystals of $\\rm Pr_{1-x}Ca_{x}MnO_3$ ($x$ = 0.3, 0.35 and 0.4). These correlations are a ssociated with the existence of spin clusters with populations that drastically depend on the doping ($x$) and temperature. Concentrated spin clusters coexist with long-range canted AF order in a wide temperature range for $x$ = 0.3 while clusters do not appear in the $x$ = 0.4 crystal. In contrast, both CO and AF order parameters in the $x$ = 0.35 crystal show a precipitous decrease below $\\sim$ 35 K where spin clusters form. These results provide direct evidence of magnetic phase separation and indicate that there is a critical doping $x_{c}$ (close to $x$ = 0.35) that divides the phase-separated site-centered from the homogeneous bond-centered or charge-disproportionated CO ground state.

  8. Tandem assays of protein and glucose with functionalized core/shell particles based on magnetic separation and surface-enhanced Raman scattering.

    Science.gov (United States)

    Kong, Xianming; Yu, Qian; Lv, Zhongpeng; Du, Xuezhong

    2013-10-11

    Tandem assays of protein and glucose in combination with mannose-functionalized Fe3 O4 @SiO2 and Ag@SiO2 tag particles have promising potential in effective magnetic separation and highly sensitive and selective SERS assays of biomaterials. It is for the first time that tandem assay of glucose is developed using SERS based on the Con A-sandwiched microstructures between the functionalized magnetic and tag particles.

  9. Coupling Underwater Superoleophobic Membranes with Magnetic Pickering Emulsions for Fouling-Free Separation of Crude Oil/Water Mixtures: An Experimental and Theoretical Study.

    Science.gov (United States)

    Dudchenko, Alexander V; Rolf, Julianne; Shi, Lucy; Olivas, Liana; Duan, Wenyan; Jassby, David

    2015-10-27

    Oil/water separations have become an area of great interest, as growing oil extraction activities are increasing the generation of oily wastewaters as well as increasing the risk of oil spills. Here, we demonstrate a membrane-based and fouling-free oil/water separation method that couples carbon nanotube-poly(vinyl alcohol) underwater superoleophobic ultrafiltration membranes with magnetic Pickering emulsions. We demonstrate that this process is insensitive to low water temperatures, high ionic strength, or crude oil loading, while allowing operation at high permeate fluxes and producing high quality permeate. Furthermore, we develop a theoretical framework that analyzes the stability of Pickering emulsions under filtration mechanics, relating membrane surface properties and hydrodynamic conditions in the Pickering emulsion cake layer to membrane performance. Finally, we demonstrate the recovery and recyclability of the nanomagnetite used to form the Pickering emulsions through a magnetic separation step, resulting in an environmentally friendly, continuous process for oil/water separation. PMID:26422748

  10. Bernoulli Equation in Rotating Magnetic Fluid Separation%旋转磁流体分选法中的伯努利方程研究

    Institute of Scientific and Technical Information of China (English)

    张应强; 魏镜弢; 张明; 张晶

    2014-01-01

    立足于旋转磁流体的非磁性矿物分选法,从磁流体微元体模型受力状态出发,对旋转磁流体运动状态进行了分析,以流体力学、铁磁流体力学、离心力学等理论基础为手段,建立旋转磁流体伯努利方程,为旋转磁流体分选法的理论完善和工业应用提供支持。%Starting from non-magnetic mineral separation using rotating magnetic fluid,and focusing on the forces in representative elemental volume of magnetic fluid,the state of dynamics in magnetic fluid is analysed. Based on hydromechanics,ferrohydromechanics(FHD),centrifugal mechanics,etc,the Bernoulli eguation in rotating magnetic fluid separation is established. All of these tasks would help to improve the theories and industrial application of rotating magnetic fluid separation.

  11. Theory and Performance of a Slurry Flow in Form of a Film in the 6ERM–35/315 Separator With a High—Gradient Magnetic Field

    OpenAIRE

    Turkenich, A. M.

    1996-01-01

    The physical foundations and theoretical determination of conditions for formation of a slurry flow in form of a film along ferromagnetic plates of a rotary high—gradient magnetic separator are described. It is shown that this new hydrodynamics allows to increase not only the reliability of the separator thanks to the increase of the width of gaps between the plates, but also to improve its metallurgical efficiency.

  12. Ferric hydrogen sulfate supported on silica-coated nickel ferrite nanoparticles as new and green magnetically separable catalyst for 1,8-dioxodecahydroacridine synthesis

    Institute of Scientific and Technical Information of China (English)

    Amir Khojastehnezhad; Mohammad Rahimizadeh; Hossein Eshghi; Farid Moeinpour; Mehdi Bakavoli

    2014-01-01

    A new magnetically separable catalyst consisting of ferric hydrogen sulfate supported on sili-ca-coated nickel ferrite nanoparticles was prepared. The synthesized catalyst was characterized using vibrating sample magnetometry, X-ray diffraction, transmission electron microscopy, scan-ning electron microscopy, and Fourier transform infrared spectroscopy. This new magnetic catalyst was shown to be an efficient heterogeneous catalyst for the synthesis of 1,8- dioxodecahydroacri-dines under solvent-free conditions. The catalyst is readily recovered by simple magnetic decanta-tion and can be recycled several times with no significant loss of catalytic activity.

  13. 弱磁性矿石高效强磁选关键技术及装备研究%Key Technologies and Equipments of High Intensity Magnetic Separation for Weakly Magnetic Minerals

    Institute of Scientific and Technical Information of China (English)

    饶宇欢; 熊大和

    2015-01-01

    The mineral processing equipment of weak magnetic ores has some key technological difficulties, such as low magnetic field, easily jammed magnetic media, low recovery rate and difficult maintenance. This paper discusses a series of theoretical problems in designing magnetic separator, including dynamic function of fine-grain sized ore particle in the multi-force field and relation function affecting mineral processing indexes. Magnetic field intensity (>1.0T) is obtained by unique armor furnishing and inner cooling magnetic system to reduce magnet leakage. Easy jamming problem of magnetic separator is solved by bar-shaped magnetic media with optimized structure. The former hydraulic magnetic separator can only process small particle size crude ores (<1 mm). However, the newly-invented magnetic separator has the capacity to separate crude ores with large particle size (2~5 mm).The invention of dry vibrating high gradient magnetic separator expands the magnetic separation from hydraulic to dried technologies. The daily processing capacity of a single SLon magnetic separator reaches 10,000t. The industrial application of SLon magnetic separators, with more than 30 models, has been practiced.%针对我国弱磁性矿石选矿效率低,强磁选设备存在磁场强度低、磁介质易堵塞、回收率低、维修难度大等重大技术难题。研究提出了微细粒弱磁性矿粒在综合力场中的动力学方程和影响弱磁性矿物选矿指标的关系方程式等一系列磁选机设计方面的理论问题;在装备设计中通过独特的铠装、水内冷磁系,减少漏磁,获得了1.0 T以上磁场强度,实现了强磁选机节能;研发了棒状磁介质及其优化排列结构,解决了强磁选机易堵塞问题;发明了分选大颗粒物料(2~5 mm)的强磁选机,解决了湿式强磁选机仅能处理小于1 mm物料的难题;发明了干式振动高梯度磁选机,使强磁选从湿式

  14. Key Technologies and Equipments of High Intensity Magnetic Separation for Weakly Magnetic Minerals%弱磁性矿石高效强磁选关键技术及装备研究

    Institute of Scientific and Technical Information of China (English)

    饶宇欢; 熊大和

    2015-01-01

    针对我国弱磁性矿石选矿效率低,强磁选设备存在磁场强度低、磁介质易堵塞、回收率低、维修难度大等重大技术难题。研究提出了微细粒弱磁性矿粒在综合力场中的动力学方程和影响弱磁性矿物选矿指标的关系方程式等一系列磁选机设计方面的理论问题;在装备设计中通过独特的铠装、水内冷磁系,减少漏磁,获得了1.0 T以上磁场强度,实现了强磁选机节能;研发了棒状磁介质及其优化排列结构,解决了强磁选机易堵塞问题;发明了分选大颗粒物料(2~5 mm)的强磁选机,解决了湿式强磁选机仅能处理小于1 mm物料的难题;发明了干式振动高梯度磁选机,使强磁选从湿式分选扩大到干式分选。 SLon系列强磁选机已有30多种型号,单台设备日处理量可达10000 t。研究提出了强磁选选矿的新工艺,实现了SLon系列强磁选机的大规模工业应用。%The mineral processing equipment of weak magnetic ores has some key technological difficulties, such as low magnetic field, easily jammed magnetic media, low recovery rate and difficult maintenance. This paper discusses a series of theoretical problems in designing magnetic separator, including dynamic function of fine-grain sized ore particle in the multi-force field and relation function affecting mineral processing indexes. Magnetic field intensity (>1.0T) is obtained by unique armor furnishing and inner cooling magnetic system to reduce magnet leakage. Easy jamming problem of magnetic separator is solved by bar-shaped magnetic media with optimized structure. The former hydraulic magnetic separator can only process small particle size crude ores (<1 mm). However, the newly-invented magnetic separator has the capacity to separate crude ores with large particle size (2~5 mm).The invention of dry vibrating high gradient magnetic separator expands the magnetic separation from hydraulic to dried

  15. 莱矿磁选工艺技术改造措施%Technical Transformtion Measures of Magnetic Separation Process in Laiwu Mining Industry

    Institute of Scientific and Technical Information of China (English)

    鲍加庆

    2014-01-01

    莱矿选矿厂为提高铁金属回收率,降低尾矿品位,减少铁金属的流失,不断对磁选进行技术改造,实施磨前湿选工艺,应用大筒径磁选机,使用中磁机及污水磁选机,对尾矿进行扫选改造,更新磁选设备等,取得了良好的效果,最终铁金属综合回收率达到93%以上,尾矿品位降到7%以下。%In order to increase the recovery rate, reduce the tailing grade and reduce the loss of iron metal, the technical transformations of magnetic separation have continuous been carried out in concentrator of Laiwu Mining Industry Co., Ltd., such as implementing wet-grinding pre-selection process, using big tube diameter magnetic separator, using the medium magnetic separation machine and the magnetic separator machine with disposing waste water, transforming sweep choose for tailing, updating the equipment of mineral concentration and so on, achieved good results. At last the recovery rate of the iron metal was above 93%, the tailing grade was down to 7%or less.

  16. MAGNETIC DRUM SEPARATOR PERFORMANCE SCALPING SHREDDED TROMMEL OVERFLOW AT NOMINAL DESIGN CONDITIONS. TEST NO. 4.03, RECOVERY 1, NEW ORLEANS

    Science.gov (United States)

    This report describes the first test of the shredded trommel overs magnetic drum separator at the New Orleans, Louisiana, resource recovery facility. Shredded trommel overs refers to waste which reports to the oversize discharge from the trommel and is subsequently shredded. For ...

  17. Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet

    NARCIS (Netherlands)

    Rem, P.C.; Berkhout, S.P.M.; Fraunholcz, O.N.

    2008-01-01

    The invention relates to a process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet, wherein a mixture of said liberated ferrous and not liberated ferrous fragments is fed onto a continuous conveyor belt whic

  18. Recovery and separation of erythromycin from industrial wastewater by imprinted magnetic nanoparticles that exploit β-cyclodextrin as the functional monomer.

    Science.gov (United States)

    Zhang, Yuxin; Li, Jinyang; Wang, FeiFei; Wu, Gang; Qv, Xue; Hong, Hua; Liu, Changsheng

    2016-01-01

    A type of surface imprinting over magnetic Fe3 O4 nanoparticles utilizing erythromycin-A as a template for use in the separation and recovery of erythromycin was developed and investigated. As the intermolecular forces play a key role in the performance of imprinted materials, differential scanning calorimetry, and (1) H NMR spectroscopy was employed to evaluate the interactions between erythromycin and the functional monomer β-cyclodextrin. To synthesize the surface imprinted polymers, magnetic Fe3 O4 nanoparticles, the core materials, were modified with a free radical initiator to initialize polymerization in a "grafting from" manner. Then using acryloyl-modified β-cyclodextrin as the functional monomer and ethyleneglycol dimethacrylate as the cross-linker, thin erythromycin-imprinted films were fabricated by the radical-induced graft copolymerization of monomers on the surface of the Fe3 O4 nanoparticles. Selectivity experiments showed that the erythromycin-A-imprinted materials had recognition ability toward erythromycin derivatives. Finally, these magnetic molecularly imprinted particles were successfully used for the separation and enrichment of erythromycin from the mother liquor. The recovery, detected by high-performance liquid chromatography and differential pulse voltammetry, approached 97%. The combination of the specific selectivity of the imprinted material and the magnetic separation provided a powerful tool that is simple, flexible, and selective for the separation and recovery of erythromycin. PMID:26805958

  19. Effect of traveling magnetic field on separation and purification of Si from Al-Si melt during solidification

    Science.gov (United States)

    Zou, Q. C.; Jie, J. C.; Liu, S. C.; Wang, T. M.; Yin, G. M.; Li, T. J.

    2015-11-01

    Separation and purification of the Si crystal during solidification process of hypereutectic Al-30Si melt under traveling magnetic field (TMF) were investigated in the present study. The results showed that under a proper condition the Si-rich layer can be formed in the periphery of the ingot while the inner microstructure is mainly the Al-Si eutectic structure. The intense melt flow carries the bulk liquid with higher Si content to promote the growth of the primary Si phase which is first precipitated close to the inner wall of the crucible with a relatively lower temperature, which resulting in the remarkable segregation of the primary Si phase. The impurity contents of the refined Si can be reduced to a very low level. The typical metallic impurities have removal fraction higher than 99.5%. In addition, there is a significant difference in the P contents between the primary and eutectic Si phases, which might be ascribed to the formation of AlP phase that acts as the heterogeneous nucleation sites. Furthermore, a considerable amount of Fe-containing particles with a size about 100-300 nm is found inside the eutectic Si phase, indicating an unintended entrapment of Fe in Si.

  20. Multifunctional inorganic-organic hybrid nanospheres for rapid and selective luminescence detection of TNT in mixed nitroaromatics via magnetic separation.

    Science.gov (United States)

    Ma, Yingxin; Huang, Sheng; Wang, Leyu

    2013-11-15

    Rapid, sensitive and selective detection of 2,4,6-trinitrotoluene (TNT) in aqueous solution differentiating from other nitroaromatics and independent of complicated instruments is in high demand for public safety and environmental monitoring. Despite of many methods for TNT detection, it is hard to differentiate TNT from 2,4,6-trinitrophenol (TNP) due to their highly similar structures and properties. In this work, via a simple and versatile method, LaF3ːCe(3+)-Tb(3+)and Fe3O4 nanoparticle-codoped multifunctional nanospheres were prepared through self-assembly of the building blocks. The luminescence of these nanocomposites was dramatically quenched via adding nitroaromatics into the aqueous solution. After the magnetic separation, however, the interference of other nitroaromatics including 2,4,6-trinitrophenol (TNP), 2,4-dinitrotoluene (DNT), and nitrobenzene (NB) was effectively overcome due to the removal of these coexisting nitroaromatics from the surface of nanocomposites. Due to the formation of TNT(-)-RCONH3(+), the TNT was attached to the surface of the nanocomposites and was quantitatively detected by the postexposure luminescence quenching. Meanwhile, the luminescence intensity is negatively proportional to the concentration of TNT in the range of 0.01-5.0 μg/mL with the 3σ limit of detection (LOD) of 10.2 ng/mL. Therefore, the as-developed method provides a novel strategy for rapid and selective detection of TNT in the mixture solution of nitroaromatics by postexposure luminescence quenching. PMID:24148441

  1. Preparation of anionic polyelectrolyte modified magnetic nanoparticles for rapid and efficient separation of lysozyme from egg white.

    Science.gov (United States)

    Chen, Jia; Lin, Yuexin; Jia, Li

    2015-04-01

    Poly(sodium 4-styrenesulfonate) modified magnetic nanoparticles (PSS-MNPs) were successfully synthesized and characterized by transmission electron microscopy, scanning electron microscopy, zeta potential, vibrating sample magnetometry, and Fourier-transform infrared spectrometry. The PSS-MNPs were found to enable effective separation of lysozyme from egg white. The impacts of solution pH, ionic strength, and contact time on the adsorption process were investigated. The adsorption kinetic data were well fitted using a pseudo-second-order kinetic model and the adsorption equilibrium can be reached in 3 min. The adsorption isotherm data could be well described by the Langmuir equation. The maximum adsorption capacity of PSS-MNPs for lysozyme was calculated to be 476.2 mg g(-1) according to the Langmuir adsorption isotherm. The fast and efficient adsorption of lysozyme by PSS-MNPs was mainly based on electrostatic interactions between them. The adsorbed lysozyme can be eluted using 20mM phosphate buffer (pH 7.0) containing 1.0M NaCl with a recovery of 96%. The extracted lysozyme from egg white demonstrated high purity, retaining about 90.7% of total lysozyme activity. PMID:25728660

  2. Microwave Heating and Pre-sintering of Copper Powder Metal Compacts in Separated Electric and Magnetic Fields

    Science.gov (United States)

    Martin, Kelly; Johnson, Earnie; Ma, Junkun; Miskovsky, Nicholas; Weisel, Gary; Weiss, Brock; Zimmerman, Darin

    2006-03-01

    We present results of microwave heating and pre-sintering of pure copper metal powder compacts. Using a 2.45GHz, WR284 microwave system operating in TE102 single mode resonance, we have systematically studied the microwave heating and pre-sintering behavior of various copper powder metal compacts as a function of particle size and green density. Cylindrical samples (0.25in by 0.25in) were positioned in either the magnetic-- or electric--field antinode, allowing the study of the separate effects of the two fields. The results show significant differences in heating rates and sample microstructure (SEM) even when average sample temperatures are below half the melting point of bulk copper. Numerical simulations of the absorption and heating have been developed to check the consistency of the experimental results. We acknowledge the additional work of undergraduate students John Diehl, John Rea, Charles Smith, and Devin Spratt, who assisted in the setup of experimental apparatus, sample preparation, and data acquisition.

  3. Dry magnetic separation experiment on converter steel slag of small particle size based on new roll separator%基于新型辊式机的细粒转炉钢渣干法磁选试验

    Institute of Scientific and Technical Information of China (English)

    史长亮; 张兵豪; 孙小朋; 李沙; 李勇军

    2015-01-01

    A multi-stage roll separator was designed for converter steel slag of small particle size,which was of low-grade and different magnetite iron minerals. Experiments were carried out for single-stage magnetic roller roughing and multi-stage magnetic roller concentrating under different grind size. The impacts of magnetic roller rotation frequency and separation distance on the concentrate grade and recovery of each particle size steel slag were compared. The results show that concentrate grade by multi-stage magnetic roller is significantly higher than the single-stage magnetic roller roughing, although the recovery rate is slightly lower. Magnetic roller rotation frequency obviously affects the recovery rate,and, separation distance is significantly higher at both sides of the value. Better performance of magnetic separator can be at-tained with the smaller particle size. Grinding fineness of <0.3 mm accounting for 90% can increase the concentrate grade by about 32 percentage points compared with the raw ore.%选取低品位、多组分磁性铁矿物转炉初炼钢渣,设计适用于细粒钢渣处理的多级辊式磁选机,开展了不同磨矿粒度下单级磁辊粗选及多级磁辊精选试验,对比了磁辊转频、分选行程对各粒度钢渣精矿品位及回收率的影响.结果表明:精选精矿品位明显高于粗选精矿品位,回收率略低;磁辊转频影响回收率较为明显,分选行程两边取值对磁选指标影响程度明显高于中间取值;磨矿粒度越细,磁选机综合处理效果越好;磨矿粒度小于0.3 mm粒级的占90%,精选精矿品位比原矿品位提高约32个百分点.

  4. 磁性催化剂与磁稳定床反应器或磁集成强化反应过程%Intensification catalytic reaction by integration of magnetic catalyst and magnetically stabilized bed reactor or magnetic separator

    Institute of Scientific and Technical Information of China (English)

    宗保宁

    2012-01-01

    通过将非晶态镍合金催化剂的磁性和加氢活性与磁稳定床反应器集成,实现了在己内酰胺加氢精制过程的工业应用.磁稳定床加氢精制替代己内酰胺氧化精制过程,显著提高了反应过程的能效和物效,并减少了污染物排放.非晶态镍合金催化剂与磁分离集成,强化了苯甲酸加氢反应过程.磁性Pd/Al2O3和NiSO4/Al2O3催化剂与磁稳定床反应器集成,强化了乙炔选择性加氢反应和烯烃叠合反应,形成了新技术生长点.%Utilizing the excellent hydrogenation activity and magnetism of the amorphous Ni catalyst, a magnetically stabilized bed reactor was developed for the purification of caprolactam, to ensure higher reactor and process efficiency. Integration of amorphous Ni catalyst and magnetic separator has enhanced the benzoic acid hydrogenation reaction to reduce the Pd/C catalyst consumption by 50%, and to increase the plant output by 15%, respectively. Integration of the appropriate magnetic catalyst into the magnetically stabilized bed reactor also allowed improved performances in selective hydrogenation of acetylene and olefin oligomerization, compared with current processes, and thus constitutes a highly effective technique for process intensification.

  5. Ferrimagnetism and magnetic phase separation in Nd{sub 1−x}Y{sub x}MnO{sub 3} studied by magnetization and high frequency electron paramagnetic resonance

    Energy Technology Data Exchange (ETDEWEB)

    Nair, Harikrishnan S., E-mail: krishnair1@gmail.com [Department of Physics, Indian Institute of Science, Bangalore 560012 (India); Yadav, Ruchika [Department of Physics, Indian Institute of Science, Bangalore 560012 (India); Adiga, Shilpa [Jülich Center for Neutron Sciences 2/Peter Grünberg Institute 4, Forschungszentrum Jülich GmbH, 52425 Jülich (Germany); Rao, S.S. [Materials Science Division, Army Research Office, Research Triangle Park, North Carolina 27709 (United States); Department of Material Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Tol, Johan van [National High Magnetic Field Laboratory, Centre for Interdisciplinary Magnetic Resonance, Florida State University,1800 E. Paul Dirac Drive, Tallahassee, Florida 32310 (United States); Elizabeth, Suja [Department of Physics, Indian Institute of Science, Bangalore 560012 (India)

    2015-01-01

    Ferrimagnetism and metamagnetic features tunable by composition are observed in the magnetic response of Nd{sub 1−x}Y{sub x}MnO{sub 3}, for x=0.1–0.5. For all values of x in the series, the compound crystallizes in orthorhombic Pbnm space group similar to NdMnO{sub 3}. Magnetization studies reveal a phase transition of the Mn-sublattice below T{sub N}{sup Mn}≈80K for all compositions, which, decreases up on diluting the Nd-site with Yttrium. For x=0.35, ferrimagnetism is observed. At 5 K, metamagnetic transition is observed for all compositions x<0.4. The evolution of magnetic ground states and appearance of ferrimagnetism in Nd{sub 1−x}Y{sub x}MnO{sub 3} can be accounted for by invoking the scenario of magnetic phase separation. The high frequency electron paramagnetic resonance measurements on x=0.4 sample, which is close to the critical composition for phase separation, revealed complex temperature dependent lineshapes clearly supporting the assumption of magnetic phase separation.

  6. 铁钛平行分选对微细粒钛铁矿强磁选的影响%Effect of Parallel Separation of Fe and Ti on High-Intensity Magnetic Separation of Micro-fine Ilmenite

    Institute of Scientific and Technical Information of China (English)

    郭小飞; 袁致涛; 申帅平; 李丽匣

    2016-01-01

    The separation test of -3.2 mm V-Ti magnetite ore ultra-finely crushed by HPGR was carried out with the process of parallel separation of Fe and Ti.The effect of high-intensity magnetic separation on ilmenite was investigated.When the crushed ores with grind fineness of-74 μm accounted for 80%,the liberation degree of the product crushed by HPGR increased by 0.58% and the number of iron oxide in the ores with fineness of -19 μm +1 1 μm decreased by 1.38%,compared with that by Jaw crusher.The TiO2 recovery could increase by 5.1 1 % and the content of the product with -19 μm could reduce by 2.62% in high-intensity magnetic concentrate,compared with the product crushed by Jaw crusher and separated by the process of stage-grinding and stage-separating.The force analysis on ilmenite with different sizes in the separation space show that,as the particle size decreases gradually,the specific resistance on ilmenite increases sharply and the specific magnetic force reduces,so ilmenite particle is more difficult to be captured by magnetic field.The process of parallel separation of Fe and Ti can reduce the amount of newly formed micro-fine ilmenite in the separation, improving the performance of high-intensity magnetic separation of ilmenite.%采用“铁钛平行分选”工艺对高压辊磨超细碎的-3.2 mm 钒钛磁铁矿进行选别实验,研究了强磁选对钛铁矿的分选效果.当磨矿细度为-74μm粒级占80%时,辊压产品选钛给矿的单体解离度较颚破产品高0.58%,辊压产品-19μm +11μm 粒级中铁氧化物的单体含量较颚破产品低1.38%.与颚破产品采用“阶段磨矿-阶段分选”工艺相比,“铁钛平行分选”得到的强磁精矿中 TiO2的回收率提高5.11%,-19μm粒级的含量降低2.62%.不同粒级钛铁矿在分选空间中的受力分析表明,当粒度降低时,钛铁矿所受的比阻力急剧增加,而比磁力却有所降低,这增加了钛铁矿颗粒被磁场捕获的难度.“

  7. THE RESEARCH AND APPLICATION OF CYCLONE MAGNETIC SEPARATOR%旋流磁力分选机的研究及应用

    Institute of Scientific and Technical Information of China (English)

    史佩伟; 王晓明; 梁殿印

    2012-01-01

    为了进一步提高选矿工艺流程中磁性矿物的分选效率,有必要探索磁铁矿分选机理,研究新型选矿装备,适应选矿高效化的要求.本文介绍了一种新型的旋流磁力分选机,其特点是利用多种分选力场,实现贫矿提纯或者高效回收的目的.%To further improve the separation efficiency of magnetic minerals in beneficiation process, it' s necessary to explore the mechanism of magnetite separation and develop new type of separating equipment to meet the requirements of high efficient separation. This article describes a new type of cyclone magnetic separator, which is characterized by using of a variety of sorting force fields to achieve the purposes of lean ore purification or high efficient recycling.

  8. Separation of species of a binary fluid mixture confined between two concentric rotating circular cylinders in presence of a strong radial magnetic field

    Energy Technology Data Exchange (ETDEWEB)

    Sharma, B.R. [Dibrugarh University, Department of Mathematics, Dibrugarh, Assam (India); Singh, R.N. [Marwari Hindi High School, Dibrugarh (India)

    2010-08-15

    The effect of a radial magnetic field on separation of a binary mixture of incompressible viscous thermally and electrically conducting fluids confined between two concentric rotating circular cylinders with different angular velocity is examined. The equations governing the motion, temperature and concentration in cylindrical polar coordinate are solved analytically. The solution obtained in closed form for concentration distribution is plotted against the radial distances from the surface of the inner circular cylinder for various values of non-dimensional parameters. It is found that the non-dimensional parameters viz. the Hartmann number, thermal diffusion number, baro diffusion number, rotational Reynolds number, the product of Prandtl number and Eckert number, magnetic Prandtl number and the ratio of the angular velocities of inner and outer cylinders affects the species separation of rarer and lighter component significantly. The problem discussed here derives its application in the basic fluid dynamics separation processes to separate the rarer component of the different isotopes of heavier molecules where electromagnetic method of separation does not work. (orig.)

  9. Cluster glass magnetism in the phase-separated Nd{sub 2/3}Ca{sub 1/3}MnO{sub 3} perovskite

    Energy Technology Data Exchange (ETDEWEB)

    Fertman, Elena, E-mail: fertman@ilt.kharkov.ua [B. Verkin Institute for Low Temperature Physics and Engineering NASU, 47 Lenin Ave., Kharkov 61103 (Ukraine); Dolya, Sergiy; Desnenko, Vladimir; Beznosov, Anatoly [B. Verkin Institute for Low Temperature Physics and Engineering NASU, 47 Lenin Ave., Kharkov 61103 (Ukraine); Kajnakova, Marcela; Feher, Alexander [P. J. Safarik University in Kosice, Faculty of Science, Park Angelinum 9, 04154 Kosice (Slovakia)

    2012-09-15

    A detailed study of the low-temperature magnetic state and the relaxation in the phase-separated colossal magnetoresistance Nd{sub 2/3}Ca{sub 1/3}MnO{sub 3} perovskite has been carried out. Clear experimental evidence of the cluster-glass magnetic behavior of this compound has been revealed. Well defined maxima in the in-phase linear ac susceptibility {chi} Prime (T) were observed, indicative of the magnetic glass transition at T{sub g}{approx}60 K. Strongly divergent zero-field-cooled and field-cooled static magnetizations and frequency dependent ac susceptibility are evident of the glassy-like magnetic state of the compound at low temperatures. The frequency dependence of the cusp temperature T{sub max} of the {chi} Prime (T) susceptibility was found to follow the critical slowing down mechanism. The Cole-Cole analysis of the dynamic susceptibility at low temperature has shown extremely broad distribution of relaxation times, indicating that spins are frozen at 'macroscopic' time scale. Slow relaxation in the zero-field-cooled magnetization has been experimentally revealed. The obtained results do not agree with a canonical spin-glass state and indicate a cluster glass magnetic state of the compound below T{sub g}, associated with its antiferromagnetic-ferromagnetic nano-phase segregated state. It was found that the relaxation mechanisms below the cluster glass freezing temperature T{sub g} and above it are strongly different. Magnetic field up to about {mu}{sub 0}H{approx}0.4 T suppresses the glassy magnetic state of the compound. - Highlights: Black-Right-Pointing-Pointer Cluster-glass magnetic state of Nd{sub 2/3}Ca{sub 1/3}MnO{sub 3} below T{sub g}{approx}60 K has been revealed. Black-Right-Pointing-Pointer Magnetic fields up to about {mu}{sub 0}H{approx}0.4 T suppress the glassy magnetic state. Black-Right-Pointing-Pointer Extremely broad distribution of relaxation times has been found below T{sub g}. Black-Right-Pointing-Pointer The relaxation

  10. 斜环永磁高梯度磁选机的原理及应用%High-gradient permanent magnetic separator with inclined cylinder and its application

    Institute of Scientific and Technical Information of China (English)

    伍喜庆; 米夏夏; 杨斌

    2011-01-01

    介绍新型斜环永磁高梯度磁选机的基本结构,分析磁性矿粒在复合力场中的受力和捕获机理,测试该设备对某铁矿尾矿的磁选效果.该磁选机为永磁磁系,分选环为倾斜配置且分选环倾斜角度和转速可调;分选时,磁介质在底部磁场区捕收磁性矿粒,旋转到顶部非磁场区冲洗卸矿.研究结果表明:调节分选环的倾斜角度可改变磁性矿粒所受各作用力的大小,从而调节磁选粒度的下限和磁选作业的回收率;当原矿铁品位为17.81%时,经一次磁选可获得回收率为65.05%、全铁品位为29.53%的磁选精矿.该磁选机设计合理、节能,可实现连续给矿、分选和排矿.%The structure of a high-gradient permanent magnetic separator with inclined cylinder (HGPMSIC) was described, the load conditions and capture mechanism of mineral particles in a compound force field were analyzed, and magnetic separation effect of tailings containing iron by the HGPMSIC was tested. The inclination angle and rotational speed of separation cylinder, which was attached to the HGPMSIC, were adjustable. Magnetic particles were attracted by magnetic media in the inner bottom of the cylinder due to the presence of magnetic field and then washed down by pressured water after rotation into the inner top wall with nearly non-magnetic field. The mechanics analysis of mineral particles in the compound force field indicates that the lower limit of particle size (i.e. finest particle) recoverable by the HGPMSIC is controllable by adjusting the inclination of the separation cylinder. The test results of reclaiming iron minerals from a tailings containing iron by the HGPMSIC show that for a tailings with a content of 17.81% iron as feed, a magnetic concentrate with TFe grade of 29.53% and recovery of 65.05% are obtained after one time magnetic separation. The design of the magnetic separator is reasonable, and it operates well continuously through feeding

  11. Membrane Separation Process of Oxytetracycline Fermentation Broth with Magnetization%磁场强化膜分离土霉素发酵液工艺研究

    Institute of Scientific and Technical Information of China (English)

    王亚卿

    2012-01-01

    The oxytetracycline filtered broth by plate and framefilter was purified and concentrated with membrane separation techniques in magnetic field.Experiment results indicate that ultrafiltration membrane PES20 and nanofiltration membrane NF270 separation properties is better effect in 0.4 T,and the production quality of oxytetracycline increased compared with no magnetization treatment process or the original technology.%引入磁场强化膜分离技术对板框过滤后的土霉素发酵液进行提纯和浓缩,研究结果表明,经0.4T磁段磁场强化后,PES20超滤膜及NF270纳滤分离性能均表现出较佳的正效应,土霉素产品质量较无磁场作用及原工艺有所提高。

  12. Development and Application of Three New Type High Efficiency Magnetic Separators%3种新型高效磁选机的研制与应用

    Institute of Scientific and Technical Information of China (English)

    赵瑞敏

    2011-01-01

    The structures characteristics and application results of BK, CTB - 1245, BKB special multi-pole magnetic separator are introduced chiefly.It shows that these new type high efficiency drum magnetic separators play an important role in improving mineral processing efficiency and economic benefit.%对BK系列专用磁选机研发思路、应用情况及CTB-1245型超大型筒式磁选机、BKB多磁极磁选机结构特点和使用情况作了介绍.工业应用和试验表明,这些新型高效磁选设备对于提高选厂的选矿效率,增加企业经济效益起了重要作用.

  13. 用于清除胆红素的磁性亲和分离方法%Study on Removal of Bilirubin with Magnetic Affinity Separation Technique

    Institute of Scientific and Technical Information of China (English)

    徐辉; 张国亮; 张凤宝; 王淑兰

    2003-01-01

    An affinity adsorbent, Cibacron Blue 3GA immobilized magnetic polyvinyl alcohol (PVA) microsphereswas used for bilirubin removal taking the advantage of easy separation of magnetic sorbent from the biosystem.Fe3 O4 superparamagnetic particles was synthesized with hydrothermal reaction of ferrous chloride (FeCl2) and ferricchloride (FeCl3). Such magnetic particles are then encapsulated in biocompatible PVA to form magnetic polymermicrospheres sized from 2 to 15 nm with hydroxyl groups on its surface. Cibacron Blue 3GA, a dye-ligand, wascovalently coupled with the polyvinyl alcohol through the nucleophilic reaction between the chloride of its triazinering and the hydroxyl groups of PVA molecules under alkaline condition. The affinity adsorbent carried 21.1 μmolCibacron Blue 3GA per gram magnetic polymer microspheres was used to remove unconjugated and conjugatedbilirubin from the solution which was composed of bilirubin or bilirubin and protein. After the adsorption, theadsorbent loaded with bilirubin was removed easily in the magnetic field.

  14. Magnetic phase separation in double layer ruthenates Ca3(Ru1−x Ti x )2O7

    OpenAIRE

    Jin Peng; Liu, J. Y.; J. Hu; Mao, Z. Q.; F. M. Zhang; Wu, X S

    2016-01-01

    A phase transition from metallic AFM-b antiferromagnetic state to Mott insulating G-type antiferromagnetic (G-AFM) state was found in Ca3(Ru1−x Ti x )2O7 at about x = 0.03 in our previous work. In the present, we focused on the study of the magnetic transition near the critical composition through detailed magnetization measurements. There is no intermediate magnetic phases between the AFM-b and G-AFM states, which is in contrasted to manganites where a similar magnetic phase transition takes...

  15. Application on Water Treatment with Magnetic Separation%磁分离技术在水处理中的应用

    Institute of Scientific and Technical Information of China (English)

    马健伟; 宋亚瑞

    2012-01-01

    概述了磁分离技术的原理、设备及在水处理中的应用,并展望了该技术在水处理中的应用前景。%The paper gave a brief account of the principle,equipment of magnetic separation and application in water treatment,which prospects were also put forward in the paper.

  16. Novel Phase Separation and Magnetic Volume Tuning in Underdoped NaFe1-xCoxAs (x ˜0.01)

    Science.gov (United States)

    Ma, Long; Dai, J.; Lu, X. R.; Tan, Guotai; Song, Yu; Dai, Pengcheng; Zhang, C. L.; Normand, B.; Yu, Weiqiang

    2013-03-01

    NaFeAs is a quasi-2D pnictide parent compound with a weak magnetic moment and separate structural and antiferromagnetic transitions. Because Co doping leads to a superconductor with Tc ~= 20 K at a very low optimal doping of x = 0 . 02 , NaFe1-xCoxAs is uniquely suited to sensitive studies of the cohabitation and competition between magnetism and superconductivity. Using NMR as a local probe of both antiferromagnetic order and superconductivity, we have compared Knight shifts and relaxation rates on the Na, As, and Co nuclei. Above Tc, we find weak doping inhomogeneity, in the form of residual paramagnetic regions with differing TN values, and a strongly field-controlled magnetic volume. Below Tc, we observe a strong competition between antiferromagnetism and superconductivity, in which the temperature is the dominant control parameter, suppressing the magnetic volume fraction very significantly in favor of the superconducting one, while the external field suppresses Tc. Our results suggest both a microscale phase separation in real space and in reciprocal space a competition between two order parameters requiring the same electrons on the quasi-2D Fermi surface.

  17. Asymptotic behaviour of the equilibrium nuclear separation for the H{sup +}{sub 2} molecule in a strong magnetic field

    Energy Technology Data Exchange (ETDEWEB)

    Benguria, Rafael [Pontificia Universidad Catolica de Chile, Departamento de Fisica, Casilla 306, Santiago 22, Chile (Chile); Brummelhuis, Raymond [School of Economics, Mathematics and Statistics, 7-15 Gresse Street, University of London (United Kingdom); Duclos, Pierre [Centre de Physique Theorique UMR 6207-Unite Mixte de Recherche du CNRS et des Universites Aix-Marseille I, Aix-Marseille II et de l' Universite du Sud Toulon-Var-Laboratoire affilie a la FRUMAM, Luminy Case 907, F-13288 Marseille Cedex 9 (France); Perez-Oyarzun, Santiago [Instituto de Ciencias Basicas, Facultad de Ingenieria, Universidad Diego Portales, Av. Ejercito 441, Casilla 298-v, Santiago (Chile); Vytras, Petr [Katedra Matematiky, FJFI, CVUT, Trojanova 13, CZ-Prague 12000 (Czech Republic)

    2006-06-30

    We consider the hydrogen molecular ion H{sup +}{sub 2} in the fixed nuclear approximation, in the presence of a strong homogeneous magnetic field. We determine the leading asymptotic behaviour for the equilibrium distance between the nuclei of this molecule in the limit when the strength of the magnetic field goes to infinity.

  18. Experimental Research on Magnetic Separation of Ilmenite Placer of Yun Nan%云南钛铁矿砂矿磁选试验研究

    Institute of Scientific and Technical Information of China (English)

    徐明; 张渊; 傅文章; 洪秉信

    2011-01-01

    The main useful components of ilmenite placers of Yun Nan are ilmenite and titanium magnetite and the ores are extremely sliming. Experimental research on magnetic separation for this ore was adopted. When the technology of selective scrubbing dissociation was carried on, +0.030mm products of 35. 31%TiO2 with the yield of 78.25% and -0.030mm products of 8.46% TiO2 with the yield of 21.75% were obtained respectively. Directed at + 0.030mm products,low -intensity magnetic separation was adopted to remove iron,the tailings of which was carried on titanium beneficiation by adopting the technology of grading-high - intensity magnetic separation and the concentrate was carried on separating iron and titanium by using low - intensity magnetic separation-high - intensity magnetic separation. Directed at the -0.030mm products,fine particle titanium separation was carried on by using the technology of desliming-magnetic separation. Finally, titanium concentrate of 48. 83%TiO2 with recovery of 85.51% and iron concentrate of 56.62% Tfe with recovery of 25.17% were obtained. This technology is rational and feasible and the separation index is satisfactory.%云南钛铁矿石中主要有用矿物为钛铁矿、钛磁铁矿,矿石泥化较严重,针对该矿石进行了磁选试验研究.对原矿采用选择性擦洗解离,可以得到TiO2品位35.31%,产率78.25%的+0.030mm产品及TiO2品位8.46%,产率21.75%的-0.030mm产品.+0.030mm粒级采用弱磁除铁,弱磁尾矿采用分级-强磁选工艺进行选钛试验,对弱磁精矿再磨后采用弱磁-强磁工艺进行钛、铁分离;-0.030mm粒级采用脱泥-磁选工艺进行细粒选钛试验.最终可得到TiO2品位48.83%的钛精矿,回收率85.51%,TFe晶位56.62%的铁精矿,回收率25.17%.该工艺合理可行,选矿指标较为理想.

  19. Entangled microwaves as a resource for entangling spatially separate solid-state qubits: Superconducting qubits, nitrogen-vacancy centers, and magnetic molecules

    Science.gov (United States)

    Gómez, Angela Viviana; Rodríguez, Ferney Javier; Quiroga, Luis; García-Ripoll, Juan José

    2016-06-01

    Quantum correlations present in a broadband two-line squeezed microwave state can induce entanglement in a spatially separated bipartite system consisting of either two single qubits or two-qubit ensembles. By using an appropriate master equation for a bipartite quantum system in contact with two separate but entangled baths, the generating entanglement process in spatially separated quantum systems is thoroughly characterized. Decoherence thermal effects on the entanglement transfer are also discussed. Our results provide evidence that this entanglement transfer by dissipation is feasible, yielding to a steady-state amount of entanglement in the bipartite quantum system which can be optimized for a wide range of realistic physical systems that include state-of-the-art experiments with nitrogen-vacancy centers in diamond, superconducting qubits, or even magnetic molecules embedded in a crystalline matrix.

  20. Compression Sensitivity of Magnetic Separation Fly Ash Mortar and Its Mechanism%磁选粉煤灰砂浆压敏性及其机理分析

    Institute of Scientific and Technical Information of China (English)

    贾兴文; 钱觉时; 黄煜镔; 汪宏涛

    2011-01-01

    The normal fly ash was extracted by the simple magnetic separation technique to obtain the magnetic separation fly ash(MSFA). The compression sensitivity of magnetic separation fly ash mortar (MSFAM) and its mechanism were analyzed. The results show that MSFAM has favorable conductivity when the use level of magnetic separation fly ash reaches percolation threshold(40 %, by mass). Under uniaxial pressure, MSFAM has favorable compression sensitivity. Under triaxial pressure, the compression sensitivity of MSFAM decreases with the increase of confining pressure when the pressure is smaller. The compression sensitivity of MSFAM increases with the increase of use level of magnetic separation fly ash,while the compression sensitivity of MSFAM decreases with the increase of age. Under the pressure, electrons in the Fe3O4 crystal absorb energy, and exchange between Fe2+ and Fe3+ through tunnel effect. So electrons get across the barrier of cement matrix and produce tunnel current, and then MSFAM generates compression sensitivity.%对普通粉煤灰进行磁选,得到了磁选粉煤灰.研究了磁选粉煤灰砂浆的压敏性,分析了其产生的机理.结果表明:当磁选粉煤灰掺量达到"渗滤阈值"即40%(质量分数)后,砂浆具有良好的导电性;单轴压力下,磁选粉煤灰砂浆具有优良的压敏性;三轴压力下,当压力较小时,随着围压的增大,磁选粉煤灰砂浆压敏性逐渐降低;随着磁选粉煤灰掺量的增加,砂浆压敏性逐渐增强;随着龄期的延长,磁选粉煤灰砂浆压敏性有所减弱.压力作用下,Fe3O4晶体中的电子吸收能量后通过隧道效应在Fe2+和Fe3+之间交换,并穿透水泥基体的势垒产生跃迁,形成隧道电流,从而使磁选粉煤灰砂浆具有压敏性.

  1. Synthesis of Fe3O4@poly(methylmethacrylate-co-divinylbenzene) magnetic porous microspheres and their application in the separation of phenol from aqueous solutions.

    Science.gov (United States)

    Tai, Yulei; Wang, Li; Gao, Jingmin; Amer, Wael A; Ding, Wenbing; Yu, Haojie

    2011-08-15

    A simple strategy to fabricate magnetic porous microspheres of Fe(3)O(4)@poly(methylmethacrylate-co-divinylbenzene) was demonstrated. The magnetic microspheres, consisting of polymer-coated iron oxide nanoparticles, were synthesized by the modified suspension polymerization of methacrylate and divinylbenzene in the presence of a magnetic fluid. The morphology and the properties of the magnetic porous microspheres were examined by scanning electron microscopy, transmission electron microscopy, superconducting quantum interference device, Fourier transform infrared spectroscopy, thermogravimetry, and X-ray powder diffraction. The pore size distribution and the specific surface area of the microspheres were measured by nitrogen sorption and mercury porosimetry technique. As predicted from the previous knowledge, the magnetic porous microspheres possessed a high specific surface area using n-hexane as a porogen. It was further found that the amounts of divinylbenzene and methacrylate, the ratio of porogens, and the dosage of ferrofluids affect the specific surface area of the microspheres. Furthermore, the microspheres were applied to remove phenol from aqueous solutions. The results showed that the microspheres had a high adsorption capacity for phenol and a high separation efficiency due to their porous structure, polar groups, and superparamagnetic characteristic. PMID:21601864

  2. Possible magnetic phase separation in Ru-doped La{sub 0.67}Ca{sub 0.33}MnO{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Seetha Lakshmi, L.; Sridharan, V. E-mail: varadu@igcar.ernet.insridh61@hotmail.com; Natarajan, D.V.; Chandra, Sharat; Sankara Sastry, V.; Radhakrishnan, T.S.; Pandian, Ponn; Justine Joseyphus, R.; Narayanasamy, A

    2003-02-01

    X-ray diffraction, resistivity, AC susceptibility and magnetization studies on La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Ru{sub x}O{sub 3} (0{<=}x<0.085) were carried out. A significant increase in the lattice parameters indicated the presence of mixed valence state of Ru: Ru{sup 3+} and Ru{sup 4+}. The resistivity of the doped compounds exhibited two features: a broad hump and a relatively sharp peak. While a para- to ferromagnetic transition could be observed for the latter peak, no magnetic signal either in AC susceptibility or in magnetization measurements could be observed for the broad hump. The magnetic moment of Mn per unit cell decreases non-linearly from 3.55 to 3 {mu}{sub B} for the Ru compositions studied. Based on the results of the present studies and existing literature on Mn-site substituted systems, we argue that a magnetic phase separation occurs in the Ru-doped system. While the sharp peak in the resistivity corresponds to Ru{sup 4+}-enriched regions with ferromagnetic coupling of Ru with the neighboring Mn ions, the broad peak corresponds to Ru{sup 3+}-rich regions, with antiferromagnetic coupling of Ru with the neighboring Mn ions.

  3. Pre-analysis separation and concentration of actinides in groundwater using a magnetic filtration/sorption method. I. Background and concept

    International Nuclear Information System (INIS)

    A wide variety of iron oxides has been used for the removal of radioactive and toxic metals from aqueous solutions. Natural magnetite and iron ferrite (FeO x Fe2O3) in a batch mode to remove actinides (Pu and Am) from wastewater have been utilized. Compared to the batch process, enhanced capacity for actinide removal was observed using supported magnetite in a column surrounded by an external magnetic field (0.3 tesla). The enhanced magnetite capacity in the column is primarily due to magnetic filtration of colloidal and submicron actinide particles along with some actinide complex and ion exchange sorption mechanisms. The removal of the magnetic field from around the column and use of a regenerating solution will easily remove the actinides loaded on the magnetite. The magnetic field-enhanced column process is under development for a variety of applications. Previous work on using ferrites for water treatment is reviewed and the potential for using the magnetic field-enhanced column process as a pre-analysis separation and concentration method for actinides in groundwater is discussed. (author)

  4. Ni(2+)-zeolite/ferrosphere and Ni(2+)-silica/ferrosphere beads for magnetic affinity separation of histidine-tagged proteins.

    Science.gov (United States)

    Vereshchagina, T A; Fedorchak, M A; Sharonova, O M; Fomenko, E V; Shishkina, N N; Zhizhaev, A M; Kudryavtsev, A N; Frank, L A; Anshits, A G

    2016-01-28

    Magnetic Ni(2+)-zeolite/ferrosphere and Ni(2+)-silica/ferrosphere beads (Ni-ferrosphere beads - NFB) of a core-shell structure were synthesized starting from coal fly ash ferrospheres having diameters in the range of 0.063-0.050 mm. The strategy of NFB fabrication is an oriented chemical modification of the outer surface preserving the magnetic core of parent beads with the formation of micro-mesoporous coverings. Two routes of ferrosphere modification were realized, such as (i) hydrothermal treatment in an alkaline medium resulting in a NaP zeolite layer and (ii) synthesis of micro-mesoporous silica on the glass surface using conventional methods. Immobilization of Ni(2+) ions in the siliceous porous shell of the magnetic beads was carried out via (i) the ion exchange of Na(+) for Ni(2+) in the zeolite layer or (ii) deposition of NiO clusters in the zeolite and silica pores. The final NFB were tested for affinity in magnetic separation of the histidine-tagged green fluorescent protein (GFP) directly from a cell lysate. Results pointed to the high affinity of the magnetic beads towards the protein in the presence of 10 mM EDTA. The sorption capacity of the ferrosphere-based Ni-beads with respect to GFP was in the range 1.5-5.7 mg cm(-3).

  5. HRS Separator

    CERN Multimedia

    2016-01-01

    Footage of the 90 and 60 degree ISOLDE HRS separator magnets in the HRS separator zone. In the two vacuum sectors HRS20 and HRS30 equipment such as the HRS slits SL240, the HRS faraday cup FC300 and wiregrid WG210 can be spotted. Vacuum valves, turbo pumps, beamlines, quadrupoles, water and compressed air connections, DC and signal cabling can be seen throughout the video. The HRS main and user beamgate in the beamline between MAG90 and MAG60 and its switchboxes as well as all vacuum bellows and flanges are shown. Instrumentation such as the HRS scanner unit 482 / 483, the HRS WG470 wiregrid and slits piston can be seen. The different quadrupoles and supports are shown as well as the RILIS guidance tubes and installation at the magnets and the different radiation monitors.

  6. Application of Magnetic Separation Technology with Low Polymer Sewage Treatment%磁分离技术在低含聚污水处理中的应用

    Institute of Scientific and Technical Information of China (English)

    尹立平; 张浩男

    2016-01-01

    In consideration of the difficult of the polymer containing sewage treatment and its complicated process, the magnetic separation technology is carried out in industrialization test. Field test showed that the magnetic separation technology has high removal efficiency in oil and suspended solids, and it is suitable for low polymer sewage treatment. The water quality of the effluent can reach the requirement of "8.3.2", when the inlet water content of oil is less than 50 mg/L and the content of suspended matter is less than 50 mg/L. Under these experimental conditions, the optimal concentration of magnetic separation of the floc-culant and magnetic powder were 120 and 300 mg/L, respectively. Because of its smaller volume, poor performance of anti volatility, suitable for the II stage treatment process, magnetic separation technology should be set before the impact resistance of the pretreatment process.%针对含聚污水处理难度较大,处理工艺复杂的问题,开展了磁分离技术工业化试验。磁分离技术具有较高的除油及除悬浮物效率,适用于低含聚污水处理。在磁分离装置进水含油低于50 mg/L、悬浮物含量低于50 mg/L的情况下,出水水质可以达到“8.3.2”指标要求。在试验条件下,磁分离的絮凝剂及磁粉投加最佳浓度分别为120、300 mg/L,浓度再增加意义不大。由于磁分离设备容积较小,抗波动性能差,仅适用于二级处理工艺,其前应设置抗冲击能力强的预处理工艺。

  7. Experimental Research on Mineral Separation of a Magnetic-flotation Tailings Mixture%磁浮混合铁尾矿选矿试验研究

    Institute of Scientific and Technical Information of China (English)

    韩京增; 朱申红; 荀志远; 赵贵军

    2012-01-01

    将某选厂的磁选尾矿和反浮选尾矿按实际生产的产率比例混合后,进行铁矿物的回收试验。利用不同矿物间的相互载体作用进行反浮选,采用Slon-100周期式脉动高梯度磁选机进行抛尾,极大地提高了分选指标。采用两段磨矿,两段强磁选,两段弱磁选,反浮选工艺,试验最终得到产率7.54%,品位65.35%,回收率25.57%的铁精矿,以及产率8.69%,铁品位29.30%,回收率13.43%的中矿,最终尾矿品位为13.68%,与实际生产相比,精矿产率提高2.74%,回收率提高6.50%。%Experiment on iron recovery from a mixture of magnetic separation tailings mixed with reverse flotation tailings in their actual yields was made for an ore-dressing plant.Reverse flotation was used to mixture by the inter-carrier effect of different minerals,Slon-100 cyclic pulsating high gradient magnetic separator was used to discard tailings,and the separation indexes was improved greatly.By two-stage grinding,two-stage high-intensity magnetic separation,two-stage low-intensity magnetic separation and reverse flotation,an iron concentrate was obtained,with yield of 7.54%,iron grade of 65.35% and recovery of 25.57%.And a middling product was obtained also,with yield of 8.69%,iron grade of 29.30% and recovery of 13.43%.The iron grade of final tailings was 13.68%.Compared with the actual production indexes,the yield of iron concentrate was increased by 2.74%,the iron recovery was increased 6.50%.

  8. A quantitative determination of magnetic nanoparticle separation using on-off field operation of quadrupole magnetic field-flow fractionation (QMgFFF).

    Science.gov (United States)

    Orita, Toru; Moore, Lee R; Joshi, Powrnima; Tomita, Masahiro; Horiuchi, Takashi; Zborowski, Maciej

    2013-01-01

    Quadrupole Magnetic Field-Flow Fractionation (QMgFFF) is a technique for characterization of sub-micrometer magnetic particles based on their retention in the magnetic field from flowing suspensions. Different magnetic field strengths and volumetric flow rates were tested using on-off field application and two commercial nanoparticle preparations that significantly differed in their retention parameter, λ (by nearly 8-fold). The fractograms showed a regular pattern of higher retention (98.6% v. 53.3%) for the larger particle (200 nm v. 90 nm) at the higher flow rate (0.05 mL/min v. 0.01 mL/min) at the highest magnetic field (0.52 T), as expected because of its lower retention parameter. The significance of this approach is a demonstration of a system that is simpler in operation than a programmed field QMgFFF in applications to particle mixtures consisting of two distinct particle fractions. This approach could be useful for detection of unwanted particulate contaminants, especially important in industrial and biomedical applications.

  9. Effective approach towards Si-bilayer-IDA modified CoFe2O4 magnetic nanoparticles for high efficient protein separation.

    Science.gov (United States)

    Li, Jianhao; Chen, Mengjun; Gao, Zhuo; Du, Jie; Yang, Wantai; Yin, Meizhen

    2016-10-01

    Ultrafine cobalt ferrite (CoFe2O4) nanoparticles with narrow size distributions and regular morphologies were prepared through an improved procedure based on the high-temperature diol reduction method. By replacing the original reducing agent like expensive dihydric alcohol, oleylamine was applied as both stabilizer and reducing agent, which benefit for large scale synthesis of magnetic CoFe2O4 nanoparticles. To produce protein-separation agent with both high specific surface area and magnet content, inverse microemulsion system and substitution reaction were employed to render the produced CoFe2O4 nanoparticles with dense silica bilayer and iminodiacetic acid (IDA)-like structure modification. After the chelation with Cu(2+), the metal-immobilized CoFe2O4 nanoparticles can specifically absorb bovine hemoglobin (BHb) with maximum adsorption capacity as qm=1812.3mg/g. Compared with the reported Cu(2+)-immobilized magnetic nanoparticles, the as-prepared CoFe2O4@Si-IDA-Cu(2+) nanoparticles exhibited excellent adsorption capacity and were applied as high efficient protein separation agent in a real complex biological fluid like bovine blood. PMID:27400241

  10. Facile preparation of magnetic separable powdered-activated-carbon/Ni adsorbent and its application in removal of perfluorooctane sulfonate (PFOS) from aqueous solution.

    Science.gov (United States)

    Liang, Xuanqi; Gondal, Mohammed A; Chang, Xiaofeng; Yamani, Zain H; Li, Nianwu; Lu, Hongling; Ji, Guangbin

    2011-01-01

    The main aim of this study was to synthesize magnetic separable Nickel/powdered activated carbon (Ni/PAC) and its application as an adsorbent for removal of PFOS from aqueous solution. In this work, the synthesized adsorbent using simple method was characterized by using X-ray diffractionometer (XRD), surface area and pore size analyzer, vibrating sample magnetometer (VSM), and high resolution transmission electron microscope (HRTEM). The surface area, pore volume and pore size of synthesized PAC was 1521.8 m(2)g(-1), 0.96 cm(3)g(-1), 2.54 nm, respectively. Different kinetic models: the pseudo-first-order model, the pseudo-second-order model, and three adsorption isotherms--Langmuir, Freundlich and Temkin--were applied to study the sorption kinetics and isothermal behavior of PFOS onto the surface of an as-prepared adsorbent. The rate constant using the pseudo-second-order model for removal of 150 ppm PFOS was estimated as 8.82×10(-5) and 1.64×10(-4) for PAC and 40% Ni/PAC, respectively. Our results demonstrated that the composite adsorbents exhibited a clear magnetic hysteretic behavior, indicating the potential practical application in magnetic separation of adsorbents from aqueous solution phase as well. PMID:21961696

  11. Fine coal particles separation by air-solid magnetic fluidization%气固磁场流态化分选细粒煤

    Institute of Scientific and Technical Information of China (English)

    宋树磊; 赵跃民; 骆振福; 唐利刚; 杨旭亮

    2012-01-01

    利用研制的横流式气固磁稳定流化床,以0.074~0.045 mm粒级磁铁矿粉和磁珠作为高密度和低密度分选介质,对6.0~0.5 mm细粒煤进行连续分选试验。结果表明:当处于稳定流化时,磁场气固流化床比普通气固流化床具有更宽的稳定操作气速范围;外加磁场使磁性颗粒沿磁力线形成平行磁链,增大了床层空隙率,形成了分布均匀的通道,气体通过时不会产生气泡,由此形成了稳定的散式气固磁场流化床;高密度分选和低密度分选的可能偏差分别为0.085,0.075 g/cm3。%Continuous separation tests of fine coal particles of 6. 0-0. 5 mm were done by a crossflow air-solid magneti- cally stabilized fluidized bed ( MSFB ), which used 0. 074-0. 045 mm magnetite powder and magnetite beads as medi- um of high and low density separation respectively. The results show that the range of steadily operational air velocity in air-solid magnetically fluidized beds is broader than that in standard air-solid fluidized beds when they are at stable fluidization. External magnetic field compels the magnetic grains to form parallel magnetic chains following the magnet- ic induction lines, which enlarge the bed voidage and form the uniform air channels. Air bubbles cannot be produced when the air flows through the channels, thus stable and particulate air-solid magnetically fluidized beds coming into being. The possible deviation of high and low density separation are 0. 085 and 0. 075 g/cm3 respectively.

  12. A novel magnetically separable TiO2/CoFe2O4 nanofiber with high photocatalytic activity under UV–vis light

    International Nuclear Information System (INIS)

    Graphical abstract: A novel magnetically separable composite photocatalyst TiO2/CoFe2O4 nanofiber was prepared by sol–gel method and electrospinning technique, which can be reclaimed with a magnet, and the decolorizing efficiency of MB solution reached 95.87%. Highlights: ► The composite TiO2/CoFe2O4 nanofibers with diameter of 110 ± 28 nm have been successfully synthesized by the combination of sol–gel method and electrospinning technique. ► The presence of Co2+ or/and Fe3+ ions may occupy some of the lattice sites of TiO2 to form an iron–titanium solid solution and narrow the band gap, which broadens the response region of visible light. ► The resultant nanofibers not only have high decomposition efficiency with methylene blue (MB) under the UV irradiation, which is close to that of Degussa P25, but also can be separated with a magnet and avoid the secondary pollution of the treated water. -- Abstract: A novel magnetically separable heterogeneous photocatalyst TiO2/CoFe2O4 nanofiber was prepared by sol–gel method and electrospinning technology, followed by heat treatment at 550 °C for 2 h. The phase structure, morphology and magnetic property of the composite nanofibers were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscope and vibrating sample magnetometer analysis. The photocatalytic studies of TiO2/CoFe2O4 fibers suggested that the presence of CoFe2O4 not only enhanced the absorbance of UV light, but also broadened the response region to visible light. The decolorizing efficiency of methylene blue (MB) solution reaches 95.87% over TiO2/CoFe2O4 nanofibers under 300 W Hg lamp after 5 h, which is close to that of Degussa P25. Furthermore, these fibers can be collected with a magnet for reuse and effectively avoid the secondary pollution of the treated water.

  13. A novel magnetically separable TiO{sub 2}/CoFe{sub 2}O{sub 4} nanofiber with high photocatalytic activity under UV-vis light

    Energy Technology Data Exchange (ETDEWEB)

    Li, Cong-Ju, E-mail: congjuli@gmail.com [Beijing Key Laboratory of Clothing Materials R and D and Assessment, Beijing Institute of Fashion Technology, Beijing 100029 (China); Wang, Jiao-Na; Wang, Bin [Beijing Key Laboratory of Clothing Materials R and D and Assessment, Beijing Institute of Fashion Technology, Beijing 100029 (China); Gong, Jian Ru, E-mail: gongjr@nanoctr.cn [National Center for Nanoscience and Technology, China, 11 Zhongguancun Beiyitiao, Beijing 100190 (China); Lin, Zhang [Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian 350002 (China)

    2012-02-15

    Graphical abstract: A novel magnetically separable composite photocatalyst TiO{sub 2}/CoFe{sub 2}O{sub 4} nanofiber was prepared by sol-gel method and electrospinning technique, which can be reclaimed with a magnet, and the decolorizing efficiency of MB solution reached 95.87%. Highlights: Black-Right-Pointing-Pointer The composite TiO{sub 2}/CoFe{sub 2}O{sub 4} nanofibers with diameter of 110 {+-} 28 nm have been successfully synthesized by the combination of sol-gel method and electrospinning technique. Black-Right-Pointing-Pointer The presence of Co{sup 2+} or/and Fe{sup 3+} ions may occupy some of the lattice sites of TiO{sub 2} to form an iron-titanium solid solution and narrow the band gap, which broadens the response region of visible light. Black-Right-Pointing-Pointer The resultant nanofibers not only have high decomposition efficiency with methylene blue (MB) under the UV irradiation, which is close to that of Degussa P25, but also can be separated with a magnet and avoid the secondary pollution of the treated water. -- Abstract: A novel magnetically separable heterogeneous photocatalyst TiO{sub 2}/CoFe{sub 2}O{sub 4} nanofiber was prepared by sol-gel method and electrospinning technology, followed by heat treatment at 550 Degree-Sign C for 2 h. The phase structure, morphology and magnetic property of the composite nanofibers were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscope and vibrating sample magnetometer analysis. The photocatalytic studies of TiO{sub 2}/CoFe{sub 2}O{sub 4} fibers suggested that the presence of CoFe{sub 2}O{sub 4} not only enhanced the absorbance of UV light, but also broadened the response region to visible light. The decolorizing efficiency of methylene blue (MB) solution reaches 95.87% over TiO{sub 2}/CoFe{sub 2}O{sub 4} nanofibers under 300 W Hg lamp after 5 h, which is close to that of Degussa P25. Furthermore, these fibers can be collected with a magnet for reuse and

  14. Experimental investigation of inhomogeneities, nanoscopic phase separation, and magnetism in arc melted Fe-Cu metals with equal atomic ratio of the constituents

    KAUST Repository

    Hassnain Jaffari, G.

    2015-12-16

    Composition gradient and phase separation at the nanoscale have been investigated for arc-melted and solidified with equiatomic Fe-Cu. Diffraction studies revealed that Fe and Cu exhibited phase separation with no trace of any mixing. Microscopy studies revealed that immiscible Fe-Cu form dense bulk nanocomposite. The spatial distribution of Fe and Cu showed existence of two distinct regions, i.e., Fe-rich and Cu-rich regions. Fe-rich regions have Cu precipitates of various sizes and different shapes, with Fe forming meshes or channels greater than 100 nm in size. On the other hand, the matrix of Cu-rich regions formed strips with fine strands of nanosized Fe. Macromagnetic response of the system showed ferromagnetic behavior with a magnetic moment being equal to about 2.13 μB/Fe atom and a bulk like negligible value of coercivity over the temperature range of 5–300 K. Anisotropy constant has been calculated from various laws of approach to saturation, and its value is extracted to be equal to 1350 J/m3. Inhomogeneous strain within the Cu and Fe crystallites has been calculated for the (unannealed) sample solidified after arc-melting. Annealed sample also exhibited local inhomogeneity with removal of inhomogeneous strain and no appreciable change in magnetic character. However, for the annealed sample phase separated Fe exhibited homogenous strain.

  15. Iron concentration and sulfur reduction on sulphuric acid drag by magnetic roasting-magnetic separation%硫酸渣磁化焙烧—磁选提铁降硫

    Institute of Scientific and Technical Information of China (English)

    张汉泉; 路漫漫; 胡定国

    2012-01-01

    The iron content (mass fraction) is 55. 08% and the sulfur is 1. 3% in sulfuric acid residue. This experiment aims at improving the iron grade and reducing the harmful elements such as sulfur in the drag. Direct magnetic separation was used, obtaining 60. 54% iron concentrate grade, only 54. 46% iron recoveries. Then process of magnetizing roasting-magnetic separation was put forward. Through analyzing the experimental condition of magnetizing roast temperature, magnetizing roast time and the proportion of reducer, the condition of 40 minutes of roast time, 750 °C of roasting temperature and 10% reducer is the best. When the roasted product is grinded to —0. 074 mm 97. 02%, a good index through simple mineral processing is got, the iron grade of concentrate reaches to 64. 57%% and the iron recovery rate reaches to 86. 99%. The mass fraction of sulfur in iron concentrate is reduced to 0. 13% after the roasting product is separated by one roughing and one cleaning magnetic separation process.%硫酸渣铁品位为55.08%,其中有害元素硫的含量为1.3%.为高效利用硫酸渣,必须提高铁含量、降低硫磷等有害元素.硫酸渣试样直接进行弱磁选,得到铁精矿品位60.54%,精矿回收率仅为54.46%,采用磁化焙烧-弱磁选的方法来进行选铁试验,通过对磁化焙烧时间、磁化焙烧温度、还原剂的质量配比等条件试验,确定了在焙烧时间40 min,焙烧温度750℃,还原剂10%的最佳焙烧条件.焙烧矿磨矿至-0.074 mm 97.02%,用弱磁选管进行磁选的最佳试验条件,在此焙烧条件下,进行一粗一精的磁选,获得了铁品位64.57%,精矿回收率86.99%,硫含量降低到0.13%.

  16. A self-consistent two-dimensional resistive fluid theory of field-aligned potential structures including charge separation and magnetic and velocity shear

    Science.gov (United States)

    Hesse, Michael; Birn, Joachim; Schindler, Karl

    1990-01-01

    A self-consistent two-fluid theory that includes the magnetic field and shear patterns is developed to model stationary electrostatic structures with field-aligned potential drops. Shear flow is also included in the theory since this seems to be a prominent feature of the structures of interest. In addition, Ohmic dissipation, a Hall term, and pressure gradients in a generalized Ohm's law, modified for cases without quasi-neutrality, are included. In the analytic theory, the electrostatic force is balanced by field-aligned pressure gradients (i.e., thermal effects in the direction of the magnetic field) and by pressure gradients and magnetic stresses in the perpendicular direction. Within this theory, simple examples of applications are presented to demonstrate the kind of solutions resulting from the model. The results show how the effects of charge separation and shear in the magnetic field and the velocity can be combined to form self-consistent structures such as are found to exist above the aurora, suggested also in association with solar flares.

  17. Magnetic composite of Fe3O4 and activated carbon as a adsorbent for separation of trace Sr(II) from radioactive wastewater

    International Nuclear Information System (INIS)

    Magnetic adsorbent of Fe3O4 and activated carbon (Fe3O4/AC) was prepared by chemical coprecipitation technique, and was characterized by SEM, TEM, BET, XRD, and VSM techniques in details. The adsorption results of Sr(II) on Fe3O4/AC revealed that Sr(II) adsorption on Fe3O4/AC surface was an spontaneous and endothermic process, and can be well described by the pseudo-second-order model. The adsorption of Sr(II) on Fe3O4/AC increased with increasing pH, and decreased with increasing ionic strength. Fe3O4/AC can be easily separated from aqueous solution with an external magnetic field after application. (author)

  18. A Research of YHXTG-4012 of Strong Magnetic Separation-Machine and Industrial Production%YHXTG-4012强磁选机的研制及工业生产实践

    Institute of Scientific and Technical Information of China (English)

    黄诚

    2012-01-01

    YHXTG - 4012型永磁干式强磁选机是一种磁极作业面宽、具有高磁场和高梯度的新型磁系结构的磁选机系列.对该磁极单元和磁系结构做了较详细的介绍,分析了该新型永磁强磁选机磁系结构在选别粗粒级弱磁性矿物上的优势,列举了试验样机投入生产后的选矿技术经济指标.%YHXTG-4012 type of permanent magnet in dry strong magnetic separation-machine is a pole operation in high magnetic field, wide with the high gradient of new magnetic system structure of magnetic separation machine series. In this paper, the author tells of the magnetic poles unit of structure, including a more detailed presentation. He analyzes that the new permanent magnetism in strong magnetic separation-machine magnetic system structure are not in macrolevel magnetic advantage in weak level.

  19. Volume reduction on all particle size of the contaminated soil. Continuous processing technology of attrition, chemical wash under an ambient temperature and pressure condition and magnetic separation

    International Nuclear Information System (INIS)

    An examination was conducted in order to establish a practical purification system that could largely reduce the storage volume of radioactive waste in the Intermediate Storage Facility. The examination consists of a 3-step washing treatment of contaminated soil, which includes “Milling Washing” of removed contaminated soil, chemical extraction of fine soil fraction resulted from the “Milling Washing” under an ambient temperature and pressure condition, and magnetic separation of cesium from the extracted solution. As a result of the examination, we succeeded in development of a safe system with low initial cost and running cost. (author)

  20. Radiochemical Separation and Measurement by Mass Spectrometry with Magnetic Sector with Inductively Coupled Plasma source (ICP-SFMS of Plutonium Isotopes in Soil Samples

    Directory of Open Access Journals (Sweden)

    C. O. Torres-Cortés

    2016-08-01

    Full Text Available The aim of this work is twofold: to optimize the radiochemical separation of Plutonium (Pu from soil samples, and to measure the Pu concentration. Soil samples were prepared using acid digestion assisted by microwaves; then, Pu purification was carried out with Pu AG1X8 resin. Pu isotopes were measured using Mass Spectrometry with Magnetic Sector with Inductively Coupled Plasma source (ICP-SFMS. In order to reduce the interference due to the presence of 238UH+ in the samples a desolvation system (Apex was used. The limit of detection (LOD of Pu was determined. The efficiency of Pu recovery from soil samples varies from 70 to 93%.

  1. Effect and mechanism of a High Gradient Magnetic Separation (HGMS) and Ultraviolet (UV) composite process on the inactivation of microbes in ballast water.

    Science.gov (United States)

    Ren, Zhijun; Zhang, Lin; Shi, Yue; Leng, Xiaodong; Shao, Jingchao

    2016-07-15

    The patented technology of a High Gradient Magnetic Separation (HGMS)-Ultraviolet (UV) composite process was used to treat ballast water. Staphylococcus aureus (S. aureus) was selected as the reference bacteria. After treatment by the HGMS-UV process, the concentration of S. aureus on the log 10 scale was lower than 2 at different flow rates, S. aureus suffered the most serious damage, and K(+) leakage of the bacteria was 1.73mg/L higher than separate 60min UV irradiation (1.17mg/L) and HGMS (0.12mg/L) processes. These results demonstrated that the HGMS-UV composite process was an effective approach to treat ballast water. Further, the HGMS process had synergistic action on the subsequent UV irradiation process and accelerated cell membrane damage. Meanwhile, the results of superoxide dismutase (SOD) activities of bacteria and DNA band analyses indicated that the inactivation mechanisms were different for HGMS and UV irradiation. PMID:27126180

  2. Magnetic ordering in electronically phase-separated La2-xSrxCuO4+y: Neutron diffraction experiments

    DEFF Research Database (Denmark)

    Udby, Linda; Andersen, Niels Hessel; Chou, F.C.;

    2009-01-01

    We present results of magnetic neutron diffraction experiments on the codoped superoxygenated La2-xSrxCuO4+y (LSCO+O) system with x=0.09. We find that the magnetic phase is long-range ordered incommensurate antiferromagnetic with a Neacuteel temperature T-N coinciding with the superconducting...... ordering temperature T-c=40 K. The incommensurability value is consistent with a hole doping of n(h)approximate to 1>8 but in contrast to nonsuperoxygenated La2-xSrxCuO4 with hole doping close to n(h)approximate to 18 the magnetic-order parameter is not field dependent. We attribute this to the magnetic...... order being fully developed in LSCO+O as in the spin and charge ordered "stripe" compounds La1.48Nd0.40Sr0.12CuO4 and La7/8Ba1/8CuO4....

  3. Resource Recovery and Reuse: Recycled Magnetically Separable Iron-based Catalysts for Phosphate Recovery and Arsenic Removal

    Science.gov (United States)

    Environmentally friendly processes that aid human and environmental health include recovering, recycling, and reusing limited natural resources and waste materials. In this study, we re-used Iron-rich solid waste materials from water treatment plants to synthesize magnetic iron-o...

  4. Manipulating Migration Behavior of Magnetic Graphene Oxide via Magnetic Field Induced Casting and Phase Separation toward High-Performance Hybrid Ultrafiltration Membranes.

    Science.gov (United States)

    Xu, Zhiwei; Wu, Tengfei; Shi, Jie; Wang, Wei; Teng, Kunyue; Qian, Xiaoming; Shan, Mingjing; Deng, Hui; Tian, Xu; Li, Cuiyu; Li, Fengyan

    2016-07-20

    Hybrid membranes blended with nanomaterials such as graphene oxide (GO) have great opportunities in water applications due to their multiple functionalities, but they suffer from low modification efficiency of nanomaterials due to the fact that plenty of the nanomaterials are embedded within the polymer matrix during the blending process. Herein, a novel Fe3O4/GO-poly(vinylidene fluoride) (Fe3O4/GO-PVDF) hybrid ultrafiltration membrane was developed via the combination of magnetic field induced casting and a phase inversion technique, during which the Fe3O4/GO nanocomposites could migrate toward the membrane top surface due to magnetic attraction and thereby render the surface highly hydrophilic with robust resistance to fouling. The blended Fe3O4/GO nanocomposites migrated to the membrane surface with the magnetic field induced casting, as verified by X-ray photoelectron spectroscopy, elemental analysis, and energy dispersive X-ray spectroscopy. As a result, the novel membranes exhibited significantly improved hydrophilicity (with a contact angle of 55.0°) and water flux (up to 595.39 L m(-2) h(-1)), which were improved by 26% and 206%, 12% and 49%, 25% and 154%, and 11% and 33% compared with those of pristine PVDF membranes and PVDF hybrid membranes blended with GO, Fe3O4, and Fe3O4/GO without the assistance of magnetic field during membrane casting, respectively. Besides, the novel membranes showed high rejection of bovine serum albumin (>92%) and high flux recovery ratio (up to 86.4%). Therefore, this study presents a novel strategy for developing high-performance hybrid membranes via manipulating the migration of nanomaterials to the membrane surface rather than embedding them in the membrane matrix. PMID:27355273

  5. 甘肃某镜铁矿尾矿磁化焙烧-弱磁选试验%Magnetizing Roast-Low Intensity Magnetic Separation of a Specularite Tailing from Gansu

    Institute of Scientific and Technical Information of China (English)

    苏涛; 陈铁军; 汪博

    2015-01-01

    There are 22. 39% iron in specularite tailing from Gansu. Iron mainly exists in form of specularite,and then siderite. In order to provide technical basis for comprehensive utilization of the tailing,the process of magnetizing roast-low in-tensity magnetic separation was carried out with half coking coal produced by a coking plant in Gansu Province as reductant. The results indicated that:with coal fines to raw tailings mass ratio of 1. 5%,roasting at 750℃ for 60 min,most of specularite and siderite in tailings were converted to magnetite. With the roast product grinding at 87. 36% passing 0. 074 mm,and through the process of one rough low intensity magnetic separation,one scavenging low intensity magnetic separation,and mixed rough concentrate screened by 0. 045 mm size,one cleaning low intensity magnetic separation for underflows,and concentrate mixed with the overflows,the iron concentrate with iron grade of 54. 57% and recovery of 78. 97% was achieved finally.%甘肃某镜铁矿尾矿中尚含有22.39%的铁,且铁主要以镜铁矿形式存在,其次以菱铁矿形式存在。为了给该尾矿的综合利用提供技术支持,以甘肃某焦化厂生产的半焦化煤粉作为还原剂,对该尾矿进行了磁化焙烧—弱磁选工艺研究。结果表明:在煤粉与原尾矿的质量比为1.5%、温度为750℃的条件下磁化焙烧60 min,可使原尾矿中绝大部分的镜铁矿和菱铁矿转化为磁铁矿;焙烧矿磨至-0.074 mm占87.36%后经1次弱磁粗选和1次弱磁扫选—粗、扫选所得粗精矿按0.045 mm 筛分—筛下物1次弱磁精选—精选精矿与筛上物合并,可以获得铁品位为54.57%、铁回收率为78.97%的最终铁精矿。

  6. Separation of inclusions from liquid metal contained in a triangle/square pipe by travelling magnetic field

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    By using plug flow and trajectory model, the elimination efficiency of the inclusions from liquid metals purifiedby travelling magnetic field (TMF) in either a triangle or a square pipe was analyzed theoretically. The ways to improvethe elimination efficiency were suggested. The results using different kinds of pipes were reciprocally compared. It is de-termined that by means of TMF to eliminate inclusions the efficiency is affected by the diameter of the inclusions, inwhich the inclusions can be removed most efficiently, is optimized

  7. Synthesis of Cu-Fe{sub 3}O{sub 4}@graphene composite: A magnetically separable and efficient catalyst for the reduction of 4-nitrophenol

    Energy Technology Data Exchange (ETDEWEB)

    Xu, Ran [Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, Jiangsu Province 213164 (China); Bi, Huiping, E-mail: hpbi@njust.edu.cn [Key Laboratory of Ministry of Education for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Nanjing 210094 (China); He, Guangyu [Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, Jiangsu Province 213164 (China); Zhu, Junwu [Key Laboratory of Ministry of Education for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Nanjing 210094 (China); Chen, Haiqun, E-mail: hqchenyf@hotmail.com [Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, Jiangsu Province 213164 (China)

    2014-09-15

    Highlights: • The Cu-Fe{sub 3}O{sub 4}@GE composite was prepared by one-step solvent–thermal method. • The Cu-Fe{sub 3}O{sub 4}@GE composite exhibited the highest catalytic activity with excellent stability. • The Cu-Fe{sub 3}O{sub 4}@GE composite was magnetically separable. - Abstract: In this work, the Cu-Fe{sub 3}O{sub 4}@GE composite was prepared easily by a one-step solvent–thermal method, which achieved the formation of Cu nanoparticles (Cu NPs), Fe{sub 3}O{sub 4} nanoparticles (Fe{sub 3}O{sub 4} NPs) and reduction of GO simultaneously. The morphology and structure of the composite was fully characterized by means of X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, transmission electron microscopy (TEM). The time-dependent adsorption spectra of the reaction mixture was measured by UV–vis absorption spectroscopy. The results demonstrated that the Cu NPs and Fe{sub 3}O{sub 4} NPs were densely and evenly deposited on the graphene (GE) sheets. It was found that the Cu-Fe{sub 3}O{sub 4}@GE composite exhibited high catalytic activities on the reduction of p-nitrophenol to p-aminophenol. Furthermore, the composite catalyst can be easily recovered due to its magnetic separability and high stability.

  8. Supported hydrophobic ionic liquid on magnetic nanoparticles as a new sorbent for separation and preconcentration of lead and cadmium in milk and water samples

    International Nuclear Information System (INIS)

    We have prepared a highly selective and efficient sorbent for the simultaneous separation and preconcentration of lead and cadmium ions from milk and water samples. An ionic liquid was deposited on the surface of magnetic nanoparticles (IL-MNPs) and used for solid phase extraction of these ions. The IL-MNPs carrying the target metals were then separated from the sample solution by applying an external magnetic field. Lead and cadmium were almost quantitatively retained by the IL-MNPs, and then eluted with nitric acid. The effect of different variables on solid phase extraction was investigated. The calibration curve is linear in the range from 0.3 to 20 ng mL-1 of Cd(II), and from 5 to 330 ng mL-1 of Pb(II) in the initial solution. Under optimum conditions, the detection limits are 1.61 and 0.122 μg L-1 for Pb(II) and Cd(II) respectively. Relative standard deviations (n=10) were 2.87 % and 1.45 % for 0.05 μg mL-1 and 0.2 μg mL-1 of Cd (II) and Pb (II) respectively. The preconcentration factor is 200 for both of ions. (author)

  9. Magnetically separable Cu{sub 2}O/chitosan–Fe{sub 3}O{sub 4} nanocomposites: Preparation, characterization and visible-light photocatalytic performance

    Energy Technology Data Exchange (ETDEWEB)

    Cao, Chunhua [School of Resource and Environmental Science, Wuhan University, Wuhan 430072 (China); Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, College of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056 (China); Xiao, Ling, E-mail: xiaoling9119@whu.edu.cn [School of Resource and Environmental Science, Wuhan University, Wuhan 430072 (China); Chen, Chunhua [Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, College of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056 (China); Cao, Qihua [School of Resource and Environmental Science, Wuhan University, Wuhan 430072 (China)

    2015-04-01

    Highlights: • A novel magnetically-separable Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} photocatalyst was in situ prepared. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs had rough and porous chitosan surface layer embedded with Fe{sub 3}O{sub 4} NPs. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs showed large surface areas and special dimodal pore structure. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs showed superparamagnetism and could be easily magnetic separated. • Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs exhibited good visible-light photocatalytic activity and stability. - Abstract: A novel magnetically-separable visible-light-induced photocatalyst, Cu{sub 2}O/chitosan–Fe{sub 3}O{sub 4} nanocomposite (Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NC), was prepared via a facile one-step precipitation–reduction process by using magnetic chitosan chelating copper ions as precursor. The structure and properties of Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs were characterized by XRD, FT-IR, SEM, HRTEM, SAED, EDS, BET, VSM, XPS and UV–vis/DRS. The photocatalytic activity of Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs was evaluated by decolorization of reactive brilliant red X-3B (X-3B) under visible light irradiation. The characterization results indicated that Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs exhibited relatively large specific surface areas and special dimodal pore structure because Cu{sub 2}O was wrapped in chitosan matrix embedded with Fe{sub 3}O{sub 4} nanoparticles. The tight combination of magnetic Fe{sub 3}O{sub 4} and semiconductor Cu{sub 2}O through chitosan made the nanocomposites show good superparamagnetism and photocatalytic activity. It was found that X-3B could be decolorized more efficiently in acidic media than in neutral or alkaline media. The decolorization of X-3B was ascribed to the synergistic effect of photocatalysis and adsorption. Cu{sub 2}O/CS–Fe{sub 3}O{sub 4} NCs could be easily separated from the solution by an external magnet, and the decolorization rates of X-3B

  10. 磁分离废压裂液处理技术现场试验%Field Test on Treatment of Waste Fracturing Fluid with Magnetic Separation

    Institute of Scientific and Technical Information of China (English)

    韩国勇; 宋新萍

    2016-01-01

    According to the number of conventional hydraulic fracturing and large-scale fracturing wells has been increasing in recent years, waste liquid quantity is increasing year by year, large amounts of waste fracturing fluid to promptly solve the problem, using magnetic separation technology, a high efficiency and energy saving, cost saving, movable waste frac-turing fluid recovery skid mounted device is researched and applied. The device is mainly composed of three parts∶the dispensing tank, a reaction tank and a magnetic separation ma-chine etc., the magnetic separation technology to rapid flocculation and sedimentation, rapid separation.The oil content of the treated wastewater average in 12.27 mg/L,suspend-ed solid content average in 29.3 mg/L, the sludge thickener further concentrated sludge moisture rate 65.3%-70.6%,can meet standard requirements of oil production.%近年来常规压裂和大规模压裂井数日益增多,废液量逐年增加,大量的废压裂液得不到及时处理。利用磁分离技术,研制出一种高效节能、节约成本的废压裂液回收可移动式橇装处理装置,该装置主要由配药罐、反应罐和磁分离主机三部分组成。利用磁分离技术能够使废压裂液快速絮凝沉淀、分离。处理后的废液含油浓度平均为12.27 mg/L,悬浮固体浓度平均为29.3 mg/L,经污泥浓缩机进一步浓缩后污泥含水率为65.3%~70.6%。

  11. GPS Separator

    CERN Multimedia

    2016-01-01

    Footage of the 70 degree ISOLDE GPS separator magnet MAG70 as well as the switchyard for the Central Mass and GLM (GPS Low Mass) and GHM (GPS High Mass) beamlines in the GPS separator zone. In the GPS20 vacuum sector equipment such as the long GPS scanner 482 / 483 unit, faraday cup FC 490, vacuum valves and wiregrid piston WG210 and WG475 and radiation monitors can also be seen. Also the RILIS laser guidance and trajectory can be seen, the GPS main beamgate switch box and the actual GLM, GHM and Central Beamline beamgates in the beamlines as well as the first electrostatic quadrupoles for the GPS lines. Close up of the GHM deflector plates motor and connections and the inspection glass at the GHM side of the switchyard.

  12. MAGNET

    CERN Multimedia

    by B. Curé

    2011-01-01

    The magnet operation was very satisfactory till the technical stop at the end of the year 2010. The field was ramped down on 5th December 2010, following the successful regeneration test of the turbine filters at full field on 3rd December 2010. This will limit in the future the quantity of magnet cycles, as it is no longer necessary to ramp down the magnet for this type of intervention. This is made possible by the use of the spare liquid Helium volume to cool the magnet while turbines 1 and 2 are stopped, leaving only the third turbine in operation. This obviously requires full availability of the operators to supervise the operation, as it is not automated. The cryogenics was stopped on 6th December 2010 and the magnet was left without cooling until 18th January 2011, when the cryoplant operation resumed. The magnet temperature reached 93 K. The maintenance of the vacuum pumping was done immediately after the magnet stop, when the magnet was still at very low temperature. Only the vacuum pumping of the ma...

  13. Phase separation, orbital ordering and magnetism in (La0.375Ca0.625)MnO3

    Science.gov (United States)

    Martinelli, A.; Ferretti, M.; Ritter, C.

    2016-07-01

    At 300 K (La0.375Ca0.625)MnO3 crystallizes in the orthorhombic Pnma space group; on cooling a Pnma → Pnma structural transition occurs due to charge-orbital ordering within the Mn sub-lattice, producing a superstructure consistent with a Wigner-crystal model with a tripling of the cell parameter a. The primary active mode yielding the observed ordered structure corresponds to the irreducible representation labelled Σ3, with wave vector (⅓,0,0). Nevertheless, the disordered polymorph stable at room temperature is retained at low temperature as a secondary phase, coexisting with the charge-orbital ordered structure. These two phases display different spin orderings; the antiferromagnetic structure associated to the charge-orbital ordered phase is characterized by a magnetic propagation wave vector k=(0,0,½), with a canted spin ordering in the ac plane, whereas a Cy-type arrangement develops within the disordered polymorph.

  14. Drive tube 60009 - A chemical study of magnetic separates of size fractions from five strata. [lunar soil analysis

    Science.gov (United States)

    Blanchard, D. P.; Jacobs, J. W.; Brannon, J. C.; Brown, R. W.

    1976-01-01

    Each bulk soil and both the magnetic and nonmagnetic components of the 90-150 micron and below 20 micron fractions of five soils from drive tube 60009 were analyzed. Samples were analyzed for FeO, Na2O, Sc, Cr, Co, Ni, Hf, Ta, Th, La, Ce, Sm, Eu, Tb, Yb, and Lu by neutron activation analysis. Several samples were fused and analyzed for major elements by electron microprobe analysis. Compositional variations are not systematically related to depth. The compositions of the five soils studied are well explained by a two-component mixing model whose end members are a submature Apollo 16-type soil and an extremely immature anorthositic material similar to 60025. There is evidence that the anorthositic component had received a small amount of exposure before these soils were mixed. After mixing, the soils received little exposure suggesting mixing and deposition on a rapid time scale.

  15. Potential environmental benefits of improving recycling of polyolefines – LCA of Magnetic density separation (MDS) developed in the EU FP7 funded project W2Plastic

    DEFF Research Database (Denmark)

    Olsen, Stig Irving; Bonou, Alexandra

    2012-01-01

    identify eco-design criteria for the development and secondly to document the potential environmental improvement of polyolefin recycling using the MDS technology. A preliminary study focusing solely on the carbon footprint benefits of recycling plastic waste compared to virgin production of polymers...... showed that there are large benefits to recycling. However, including other uses of the waste illustrates that the benefits to a large extent depend on that the recycled plastic have such high quality that it can actually replace virgin plastic and also to some extent depends on which energy systems e......The core of the EU FP7 funded project W2Plastic is development of a magnetic density separation (MDS) of polyolefines in order to improve the sorting efficiency of these polymer types in different waste fractions. As part of the project a life cycle assessment is performed in order to firstly...

  16. A Study of Magnetizing Roasting-magnetic Separation for Xinjiang A Siderite%新疆某菱铁矿磁化焙烧——磁选试验

    Institute of Scientific and Technical Information of China (English)

    朱德庆; 何威; 潘建; 薛子兴

    2012-01-01

    以新疆某地菱铁矿为原料,详细研究了焙烧温度、焙烧时间、还原剂用量、菱铁矿粒度、焙烧产物磨矿细度和弱磁选磁场强度等因素对磁选效果的影响.结果表明:16 ~10 mm的菱铁矿在不加还原煤、焙烧温度为800℃、焙烧时间为15 min条件下的焙烧产物磨至-0.074 mm占90%,经1次弱磁选(151.20 kA/m),可获得铁品位柏63.55%、回收率为95.76%的铁精矿.%Taking Xinjing a siderite as investigated object the effects of various factois to magnetie separation, such as roasting temperature, duration, mass ratio of coal to ore, grinding fineness of roasted ore and magnetic field intensity were investigated. It is shown that the magnetic concentrate,assaying 63.55% iron at 95.76%iron recovery, was produced under such conditions as roasting 16 ~ 10 mm siderite at 800 ℃ for 15 min within MUFFLE furnace in air atmosphere , and magnetic separation of the roasted ores with grinding fineness of 90% passing 0.074 mm and at 151.20 kA/'m field intensity.

  17. Research on Magnetizing Roasting-Low Intensity Magnetic Separation of a Xuanlong-Type Oolitic Hematite Ore%宣龙式鲕状赤铁矿石磁化焙烧-弱磁选试验

    Institute of Scientific and Technical Information of China (English)

    刘硕; 张亚辉; 张家; 张艳娇; 张红新; 李洪潮

    2015-01-01

    The iron grade of Xuanlong-type Oolitic hematite ore is up to 48. 65%. Main iron mineral is hematite,account-ing for 85. 84% of the total iron,followed by iron carbonate,representing 9. 50%. The content of magnetic iron is low,only 3. 12%. Gangue minerals are quartz with trace of harmful elements,phosphorus,aluminum,etc. . In order to explore efficient, low-consumption development and utilization of the resources,the process of magnetic roasting-low intensity magnetic separa-tion was selected. The results showed that the mass ratio of sample with 0. 2 ~ 0 mm bituminous coal and-0. 074 mm accoun-ted for 62% as 12%,roasted at 800 ℃ for 45 min,ground the roasted products to 89. 2% -0. 074 mm,and through the process of low intensity magnetic separation (magnetic field intensity 105. 6 kA/m),iron concentrate with iron grade of 62. 50% and recovery of 85. 50% was obtained. Therefore,the process of magnetic roasting-low intensity magnetic separation is the suitable process to deal with Xuanlong-type oolitic hematite.%宣龙式鲕状赤铁矿石铁品位较高,达48.65%,主要铁矿物为赤铁矿,占总铁的85.84%,其次是碳酸铁,占总铁的9.50%,磁性铁含量较低,仅占总铁的3.12%;脉石矿物主要为石英,磷、铝等有害元素含量均不高。为探索该资源的高效、低耗开发利用方案,采用磁化焙烧—弱磁选工艺进行了选矿试验研究。结果表明,0.2~0 mm的烟煤与-0.074 mm占62%的试样按质量比12%混合,在800℃下焙烧45 min,焙烧产物磨至-0.074 mm占89.2%的情况下进行弱磁选(磁场强度为105.6 kA/m ),可得到铁品位为62.50%、铁回收率为85.50%的铁精矿。因此,磁化焙烧—弱磁选工艺适合处理宣龙式鲕状赤铁矿石。

  18. Well-Combined Magnetically Separable Hybrid Cobalt Ferrite/Nitrogen-Doped Graphene as Efficient Catalyst with Superior Performance for Oxygen Reduction Reaction.

    Science.gov (United States)

    Lu, Lei; Hao, Qingli; Lei, Wu; Xia, Xifeng; Liu, Peng; Sun, Dongping; Wang, Xin; Yang, Xujie

    2015-11-18

    Catalysts with low-cost, high activity and stability toward oxygen reduction reaction (ORR) are extremely desirable, but its development still remains a great challenge. Here, a novel magnetically separable hybrid of multimetal oxide, cobalt ferrite (CoFe2O4), anchored on nitrogen-doped reduced graphene oxide (CoFe2O4/NG) is prepared via a facile solvothermal method followed by calcination at 500 °C. The structure of CoFe2O4/NG and the interaction of both components are analyzed by several techniques. The possible formation of Co/Fe-N interaction in the CoFe2O4/NG catalyst is found. As a result, the well-combination of CoFe2O4 nanoparticles with NG and its improved crystallinity lead to a synergistic and efficient catalyst with high performance to ORR through a four-electron-transfer process in alkaline medium. The CoFe2O4/NG exhibits particularly comparable catalytic activity as commercial Pt/C catalyst, and superior stability against methanol oxidation and CO poisoning. Meanwhile, it has been proved that both nitrogen doping and the spinel structure of CoFe2O4 can have a significant contribution to the catalytic activity by contrast experiments. Multimetal oxide hybrid demonstrates better catalysis to ORR than a single metal oxide hybrid. All results make the low-cost and magnetically separable CoFe2O4/NG a promising alternative for costly platinum-based ORR catalyst in fuel cells and metal-air batteries. PMID:26390018

  19. MAGNET

    CERN Multimedia

    Benoit Curé

    2010-01-01

    Operation of the magnet has gone quite smoothly during the first half of this year. The magnet has been at 4.5K for the full period since January. There was an unplanned short stop due to the CERN-wide power outage on May 28th, which caused a slow dump of the magnet. Since this occurred just before a planned technical stop of the LHC, during which access in the experimental cavern was authorized, it was decided to leave the magnet OFF until 2nd June, when magnet was ramped up again to 3.8T. The magnet system experienced a fault also resulting in a slow dump on April 14th. This was triggered by a thermostat on a filter choke in the 20kA DC power converter. The threshold of this thermostat is 65°C. However, no variation in the water-cooling flow rate or temperature was observed. Vibration may have been the root cause of the fault. All the thermostats have been checked, together with the cables, connectors and the read out card. The tightening of the inductance fixations has also been checked. More tem...

  20. MAGNET

    CERN Multimedia

    B. Curé

    2012-01-01

      Following the unexpected magnet stops last August due to sequences of unfortunate events on the services and cryogenics [see CMS internal report], a few more events and initiatives again disrupted the magnet operation. All the magnet parameters stayed at their nominal values during this period without any fault or alarm on the magnet control and safety systems. The magnet was stopped for the September technical stop to allow interventions in the experimental cavern on the detector services. On 1 October, to prepare the transfer of the liquid nitrogen tank on its new location, several control cables had to be removed. One cable was cut mistakenly, causing a digital input card to switch off, resulting in a cold-box (CB) stop. This tank is used for the pre-cooling of the magnet from room temperature down to 80 K, and for this reason it is controlled through the cryogenics control system. Since the connection of the CB was only allowed for a field below 2 T to avoid the risk of triggering a fast d...

  1. MAGNET

    CERN Multimedia

    B. Curé

    2012-01-01

      The magnet was energised at the beginning of March 2012 at a low current to check all the MSS safety chains. Then the magnet was ramped up to 3.8 T on 6 March 2012. Unfortunately two days later an unintentional switch OFF of the power converter caused a slow dump. This was due to a misunderstanding of the CCC (CERN Control Centre) concerning the procedure to apply for the CMS converter control according to the beam-mode status at that time. Following this event, the third one since 2009, a discussion was initiated to define possible improvement, not only on software and procedures in the CCC, but also to evaluate the possibility to upgrade the CMS hardware to prevent such discharge from occurring because of incorrect procedure implementations. The magnet operation itself was smooth, and no power cuts took place. As a result, the number of magnetic cycles was reduced to the minimum, with only two full magnetic cycles from 0 T to 3.8 T. Nevertheless the magnet suffered four stops of the cryogeni...

  2. One-step multiplexed detection of foodborne pathogens: Combining a quantum dot-mediated reverse assaying strategy and magnetic separation.

    Science.gov (United States)

    Yin, Binfeng; Wang, Yu; Dong, Mingling; Wu, Jing; Ran, Bei; Xie, Mengxia; Joo, Sang Woo; Chen, Yiping

    2016-12-15

    A rapid and multiplexed immunosensor was developed based on a quantum dot (QD)-reverse assaying strategy (RAS) and immuno-magnetic beads (IMBs) for one-step and simultaneous detection of Escherichia coli O157: H7 and Salmonella. In a conventional QD-based immunosensor, the fluorescence signal of the "IMBs-target-QD" immunoconjugate is directly used as the assaying readout. However, the fluorescence signal is affected by IMBs due to light scattering and the "IMBs-target-QD" immunoconjugate needs multiple washing and re-suspension steps. To address these problems, we use the surplus QD-antibody conjugate as signal readout in the RAS, which prevents interference from the IMBs, increases the fluorescence signal, and avoids complex operations. Compared with conventional QD-based immunosensor, the sensitivity of QD-RSA immunosensor for detection of Escherichia coli O157: H7 has been improved fifty-fold, and whole analysis procedure can be finished within 1h. Therefore, this RSA strategy is promising for improving the performance of QD-based immunosensors and could greatly broaden their applications. PMID:27498327

  3. A novelty strategy for the fast analysis of sulfonamide antibiotics in fish tissue using magnetic separation with high-performance liquid chromatography-tandem mass spectrometry.

    Science.gov (United States)

    Li, Jincheng; Liu, Huan; Zhang, Jing; Liu, Yang; Wu, Lidong

    2016-08-01

    A simple, fast and low-cost extraction method with high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) determination was developed on sulfonamide antibiotics (SAs) in fish tissue. Magnetic separation was first introduced into the rapid sample preparation procedure combined with acetonitrile extraction for the analysis of SAs. Partitioning was rapidly achieved between acetonitrile solution and solid matrix by applying an external magnetic field. Acetonitrile solution was collected and concentrated under a nitrogen stream. The residue was redissolved with 1‰ formic acid aqueous solution and defatted with n-hexane before analysis. The recoveries of SAs were in the range of 74.87-104.74%, with relative standard deviations <13%. The limits of quantification and the limits of detection for SAs ranged from 5.0 to 25.0 μg (kg-1) and from 2.5 to 10.0 μg (kg-1) , respectively. The presented extraction method proved to be a rapid method which only took 20 min for one sample preparation procedure. Copyright © 2016 John Wiley & Sons, Ltd. PMID:26849706

  4. On separable Pauli equations

    International Nuclear Information System (INIS)

    We classify (1+3)-dimensional Pauli equations for a spin-(1/2) particle interacting with the electro-magnetic field, that are solvable by the method of separation of variables. As a result, we obtain the 11 classes of vector-potentials of the electro-magnetic field A(t,x(vector sign))=(A0(t,x(vector sign)), A(vector sign)(t,x(vector sign))) providing separability of the corresponding Pauli equations. It is established, in particular, that the necessary condition for the Pauli equation to be separable into second-order matrix ordinary differential equations is its equivalence to the system of two uncoupled Schroedinger equations. In addition, the magnetic field has to be independent of spatial variables. We prove that coordinate systems and the vector-potentials of the electro-magnetic field providing the separability of the corresponding Pauli equations coincide with those for the Schroedinger equations. Furthermore, an efficient algorithm for constructing all coordinate systems providing the separability of Pauli equation with a fixed vector-potential of the electro-magnetic field is developed. Finally, we describe all vector-potentials A(t,x(vector sign)) that (a) provide the separability of Pauli equation, (b) satisfy vacuum Maxwell equations without currents, and (c) describe non-zero magnetic field

  5. MAGNET

    CERN Multimedia

    B. Curé

    2012-01-01

      The magnet and its sub-systems were stopped at the beginning of the winter shutdown on 8th December 2011. The magnet was left without cooling during the cryogenics maintenance until 17th January 2012, when the cryoplant operation resumed. The magnet temperature reached 93 K. The vacuum pumping was maintained during this period. During this shutdown, the yearly maintenance was performed on the cryogenics, the vacuum pumps, the magnet control and safety systems, and the power converter and discharge lines. Several preventive actions led to the replacement of the electrovalve command coils, and the 20A DC power supplies of the magnet control system. The filters were cleaned on the demineralised water circuits. The oil of the diffusion pumps was changed. On the cryogenics, warm nitrogen at 343 K was circulated in the cold box to regenerate the filters and the heat exchangers. The coalescing filters have been replaced at the inlet of both the turbines and the lubricant trapping unit. The active cha...

  6. MAGNET

    CERN Multimedia

    Benoit Curé

    2010-01-01

    The magnet was successfully operated at the end of the year 2009 despite some technical problems on the cryogenics. The magnet was ramped up to 3.8 T at the end of November until December 16th when the shutdown started. The magnet operation met a few unexpected stops. The field was reduced to 3.5 T for about 5 hours on December 3rd due to a faulty pressure sensor on the helium compressor. The following day the CERN CCC stopped unintentionally the power converters of the LHC and the experiments, triggering a ramp down that was stopped at 2.7 T. The magnet was back at 3.8 T about 6 hours after CCC sent the CERN-wide command. Three days later, a slow dump was triggered due to a stop of the pump feeding the power converter water-cooling circuit, during an intervention on the water-cooling plant done after several disturbances on the electrical distribution network. The magnet was back at 3.8 T in the evening the same day. On December 10th a break occurred in one turbine of the cold box producing the liquid ...

  7. MAGNET

    CERN Multimedia

    B. Curé

    2011-01-01

    The CMS magnet has been running steadily and smoothly since the summer, with no detected flaw. The magnet instrumentation is entirely operational and all the parameters are at their nominal values. Three power cuts on the electrical network affected the magnet run in the past five months, with no impact on the data-taking as the accelerator was also affected at the same time. On 22nd June, a thunderstorm caused a power glitch on the service electrical network. The primary water cooling at Point 5 was stopped. Despite a quick restart of the water cooling, the inlet temperature of the demineralised water on the busbar cooling circuit increased by 5 °C, up to 23.3 °C. It was kept below the threshold of 27 °C by switching off other cooling circuits to avoid the trigger of a slow dump of the magnet. The cold box of the cryogenics also stopped. Part of the spare liquid helium volume was used to maintain the cooling of the magnet at 4.5 K. The operators of the cryogenics quickly restarted ...

  8. MAGNET

    CERN Multimedia

    B. Curé

    2013-01-01

      The magnet was operated without any problem until the end of the LHC run in February 2013, apart from a CERN-wide power glitch on 10 January 2013 that affected the CMS refrigerator, causing a ramp down to 2 T in order to reconnect the coldbox. Another CERN-wide power glitch on 15 January 2013 didn’t affect the magnet subsystems, the cryoplant or the power converter. At the end of the magnet run, the reconnection of the coldbox at 2.5 T was tested. The process will be updated, in particular the parameters of some PID valve controllers. The helium flow of the current leads was reduced but only for a few seconds. The exercise will be repeated with the revised parameters to validate the automatic reconnection process of the coldbox. During LS1, the water-cooling services will be reduced and many interventions are planned on the electrical services. Therefore, the magnet cryogenics and subsystems will be stopped for several months, and the magnet cannot be kept cold. In order to avoid unc...

  9. MAGNETS

    Science.gov (United States)

    Hofacker, H.B.

    1958-09-23

    This patent relates to nmgnets used in a calutron and more particularly to means fur clamping an assembly of magnet coils and coil spacers into tightly assembled relation in a fluid-tight vessel. The magnet comprises windings made up of an assembly of alternate pan-cake type coils and spacers disposed in a fluid-tight vessel. At one end of the tank a plurality of clamping strips are held firmly against the assembly by adjustable bolts extending through the adjacent wall. The foregoing arrangement permits taking up any looseness which may develop in the assembly of coils and spacers.

  10. MAGNET

    CERN Multimedia

    B. Curé

    2011-01-01

    The magnet ran smoothly in the last few months until a fast dump occurred on 9th May 2011. Fortunately, this occurred in the afternoon of the first day of the technical stop. The fast dump was due to a valve position controller that caused the sudden closure of a valve. This valve is used to regulate the helium flow on one of the two current leads, which electrically connects the coil at 4.5 K to the busbars at room temperature. With no helium flow on the lead, the voltage drop and the temperatures across the leads increase up to the defined thresholds, triggering a fast dump through the Magnet Safety System (MSS). The automatic reaction triggered by the MSS worked properly. The helium release was limited as the pressure rise was just at the limit of the safety valve opening pressure. The average temperature of the magnet reached 72 K. It took four days to recover the temperature and refill the helium volumes. The faulty valve controller was replaced by a spare one before the magnet ramp-up resumed....

  11. 铁酸镍负载TiO2的可磁分离光催化剂的制备及性能%Preparation and Photocatalytic Properties of Magnetically Separable TiO2 Supported on Nickel Ferrite

    Institute of Scientific and Technical Information of China (English)

    许士洪; 上官文峰; 袁坚; 陈铭夏; 施建伟

    2007-01-01

    A magnetically separable photocatalyst TiO2/SiO2/NiFe2O4 (TSN) with a typical ferromagnetic hysteresis was prepared by a liquid catalytic phase transfer method.When the intensity of applied magnetic field weakened to zero,the remnant magnetism of the prepared photocatalyst faded to zero.The photocatalytst can be separated from water when an external magnetic field is added and redispersed into aqueous solution after the external magnetic field is eliminated,that makes the photocatalysts promising for wastewater treatment.Transmission electron microscope (TEM) and X-ray diffractometer (XRD) were used to characterize the structure of the photocatalyst, indicating that the magnetic SiO2/NiFe2O4 (SN) particle was compactly enveloped by P-25 titania and TiO2 shell was formed.The magnetic composite showed high photocatalytic activity for the degradation of methyl orange in water.A thin SiO2 layer between NiFe2O4 and TiO2 shell prevented effectively the leakage of charges from TiO2 particles to NiFe2O4,which gave rise to the increase in photocatalytic activity.Moreover,the experiment on recycled use of TSN demonstrated a good repeatability of the photocatalytic activity.

  12. Magnetogravimetric Separation in a Rotational Device

    OpenAIRE

    Bunge, R. C.; Fuerstenau, D. W.

    1996-01-01

    Magnetogravimetric separation in a rotational device is a promising method for effecting sharp separation of minerals according to density. Separation is accomplished by two competing forces with opposite directions, namely the magnetic buoyancy and the centrifugal force. Magnetic buoyancy is experienced by particles which are suspended in a magnetic fluid when exposed to a non—homogeneous magnetic field. Since the magnetic buoyancy depends on particle volume whereas the centrifugal depends o...

  13. On separable Pauli equations

    OpenAIRE

    Zhalij, Alexander

    2002-01-01

    We classify (1+3)-dimensional Pauli equations for a spin-1/2 particle interacting with the electro-magnetic field, that are solvable by the method of separation of variables. As a result, we obtain the eleven classes of vector-potentials of the electro-magnetic field A(t,x) providing separability of the corresponding Pauli equations. It is established, in particular, that the necessary condition for the Pauli equation to be separable into second-order matrix ordinary differential equations is...

  14. Progress on applications of magnetic nanoparticles in separation and detection%磁性纳米材料在分离和检测中的应用研究进展

    Institute of Scientific and Technical Information of China (English)

    郭祖鹏; 师存杰; 焉海波

    2012-01-01

    The applications of magnetic nanoparticles in biotechnology and environmental, and so on, has attracted considerable attention in recent years. The magnetic nanoparticles with suitable surface modification are capable of binding molecules selectively. Magnetic nanoparticles and the magnetic separations, magnetic detections have advantages of rapidity, convenience and high selectivity. In this review, the applications of magnetic nanoparticles in separation (including ion exchange and adsorbing organic compounds in water treatment, barrier separation, bioseparation, and so on) and detection (including water quality detection, bioassay, food safety detection) were reviewed. This paper have guiding significance for the construction of multifunctional magnetic nanoparticles and their applications in separation and detection.%磁性纳米材料应用于生物、环境等众多领域近年来受到了广泛关注.磁性纳米粒子经过适当的表面修饰,可高度选择性地结合目标分子,在解决目标物的快速分离检测及高特异性的选择性分离检测方面具有优势.本文介绍了磁性纳米粒子在分离(包括水处理中的离子吸附分离、水处理中有机物吸附分离、膜分离、生物分离和其他分离)及分析检测(包括水体检测、生物监测、食品安全检测)中的应用,对多功能磁性纳米粒子的构建及其在分离及分析检测领域中的应用具有指导意义.

  15. Rapid and Specific Enrichment of Culturable Gram Negative Bacteria Using Non-Lethal Copper-Free Click Chemistry Coupled with Magnetic Beads Separation.

    Science.gov (United States)

    Fugier, Emilie; Dumont, Audrey; Malleron, Annie; Poquet, Enora; Mas Pons, Jordi; Baron, Aurélie; Vauzeilles, Boris; Dukan, Sam

    2015-01-01

    Currently, identification of pathogenic bacteria present at very low concentration requires a preliminary culture-based enrichment step. Many research efforts focus on the possibility to shorten this pre-enrichment step which is needed to reach the minimal number of cells that allows efficient identification. Rapid microbiological controls are a real public health issue and are required in food processing, water quality assessment or clinical pathology. Thus, the development of new methods for faster detection and isolation of pathogenic culturable bacteria is necessary. Here we describe a specific enrichment technique for culturable Gram negative bacteria, based on non-lethal click chemistry and the use of magnetic beads that allows fast detection and isolation. The assimilation and incorporation of an analog of Kdo, an essential component of lipopolysaccharides, possessing a bio-orthogonal azido function (Kdo-N3), allow functionalization of almost all Gram negative bacteria at the membrane level. Detection can be realized through strain-promoted azide-cyclooctyne cycloaddition, an example of click chemistry, which interestingly does not affect bacterial growth. Using E. coli as an example of Gram negative bacterium, we demonstrate the excellent specificity of the technique to detect culturable E. coli among bacterial mixtures also containing either dead E. coli, or live B. subtilis (as a model of microorganism not containing Kdo). Finally, in order to specifically isolate and concentrate culturable E. coli cells, we performed separation using magnetic beads in combination with click chemistry. This work highlights the efficiency of our technique to rapidly enrich and concentrate culturable Gram negative bacteria among other microorganisms that do not possess Kdo within their cell envelope.

  16. Novel multifunctional NiFe2O4/ZnO hybrids for dye removal by adsorption, photocatalysis and magnetic separation

    Science.gov (United States)

    Zhu, Hua-Yue; Jiang, Ru; Fu, Yong-Qian; Li, Rong-Rong; Yao, Jun; Jiang, Sheng-Tao

    2016-04-01

    Novel multifunctional NiFe2O4/ZnO hybrids were prepared by a hydrothermal method and their physicochemical properties were characterized by XRD, SEM, TEM, TGA, VSM, BET and UV-vis DRS. The adsorption and photocatalytic performance of NiFe2O4/ZnO hybrids were systematically investigated using congo red as a model contaminant. With the introduction of NiFe2O4, NiFe2O4/ZnO hybrids can absorb the whole light from 300 nm to 700 nm. The adsorption capacity (221.73 mg g-1) of NiFe2O4/ZnO hybrids is higher than those of NiFe2O4, ZnO and mechanically mixed NiFe2O4/ZnO hybrids. The removal of congo red solution (20 mg L-1) by NiFe2O4/ZnO hybrids was about 94.55% under simulated solar light irradiation for 10 min. rad OH and h+ play important roles in the decolorization of congo red solution by NiFe2O4/ZnO hybrids under simulated solar light irradiation. The decolorization efficiency of congo red solution is 97.23% for the fifth time by NiFe2O4/ZnO hybrids under simulate solar light irradiation, indicating the high photostability and durability. NO3- and Cl- anions which are ubiquitous components in dye-containing wastewater have negligible influence on the effectiveness of NiFe2O4/ZnO hybrids. Moreover, the magnetic NiFe2O4/ZnO hybrids can be easily separated from the reacted solution by an external magnet.

  17. MAGNET

    CERN Multimedia

    B. Curé

    MAGNET During the winter shutdown, the magnet subsystems went through a full maintenance. The magnet was successfully warmed up to room temperature beginning of December 2008. The vacuum was broken later on by injecting nitrogen at a pressure just above one atmosphere inside the vacuum tank. This was necessary both to prevent any accidental humidity ingress, and to allow for a modification of the vacuum gauges on the vacuum tank and maintenance of the diffusion pumps. The vacuum gauges had to be changed, because of erratic variations on the measurements, causing spurious alarms. The new type of vacuum gauges has been used in similar conditions on the other LHC experiments and without problems. They are shielded against the stray field. The lubricants of the primary and diffusion pumps have been changed. Several minor modifications were also carried out on the equipment in the service cavern, with the aim to ease the maintenance and to allow possible intervention during operation. Spare sensors have been bough...

  18. MAGNET

    CERN Multimedia

    Benoit Curé

    2010-01-01

    The magnet worked very well at 3.8 T as expected, despite a technical issue that manifested twice in the cryogenics since June. All the other magnet sub-systems worked without flaw. The issue in the cryogenics was with the cold box: it could be observed that the cold box was getting progressively blocked, due to some residual humidity and air accumulating in the first thermal exchanger and in the adsorber at 65 K. This was later confirmed by the analysis during the regeneration phases. An increase in the temperature difference between the helium inlet and outlet across the heat exchanger and a pressure drop increase on the filter of the adsorber were observed. The consequence was a reduction of the helium flow, first compensated by the automatic opening of the regulation valves. But once they were fully opened, the flow and refrigeration power reduced as a consequence. In such a situation, the liquid helium level in the helium Dewar decreased, eventually causing a ramp down of the magnet current and a field...

  19. MAGNET

    CERN Multimedia

    Benoit Curé.

    The magnet operation restarted end of June this year. Quick routine checks of the magnet sub-systems were performed at low current before starting the ramps up to higher field. It appeared clearly that the end of the field ramp down to zero was too long to be compatible with the detector commissioning and operations plans. It was decided to perform an upgrade to keep the ramp down from 3.8T to zero within 4 hours. On July 10th, when a field of 1.5T was reached, small movements were observed in the forward region support table and it was decided to fix this problem before going to higher field. At the end of July the ramps could be resumed. On July 28th, the field was at 3.8T and the summer CRAFT exercise could start. This run in August went smoothly until a general CERN wide power cut took place on August 3rd, due to an insulation fault on the high voltage network outside point 5. It affected the magnet powering electrical circuit, as it caused the opening of the main circuit breakers, resulting in a fast du...

  20. MAGNET

    CERN Multimedia

    B. Curé

    2013-01-01

    The magnet is fully stopped and at room temperature. The maintenance works and consolidation activities on the magnet sub-systems are progressing. To consolidate the cryogenic installation, two redundant helium compressors will be installed as ‘hot spares’, to avoid the risk of a magnet downtime in case of a major failure of a compressor unit during operation. The screw compressors, their motors, the mechanical couplings and the concrete blocks are already available and stored at P5. The metallic structure used to access the existing compressors in SH5 will be modified to allow the installation of the two redundant ones. The plan is to finish the installation and commissioning of the hot spare compressors before the summer 2014. In the meantime, a bypass on the high-pressure helium piping will be installed for the connection of a helium drier unit later during the Long Shutdown 1, keeping this installation out of the schedule critical path. A proposal is now being prepared for the con...

  1. Rapid ionic liquid-based ultrasound assisted dual magnetic microextraction to preconcentrate and separate cadmium-4-(2-thiazolylazo)-resorcinol complex from environmental and biological samples.

    Science.gov (United States)

    Khan, Sumaira; Kazi, Tasneem Gul; Soylak, Mustafa

    2014-04-01

    A rapid and innovative microextraction technique named as, ionic liquid-based ultrasound-assisted dual magnetic microextraction (IL-UA-DMME) was developed for the preconcentration and extraction of trace cadmium from environmental and biological samples, prior to analyzed by flame atomic absorption spectrometry (FAAS). The proposed method has many obvious advantages, including evading the use of organic solvents and achieved high extraction yields by the combination of dispersive liquid-liquid microextraction (DLLME) and magnetic mediated-solid phase extraction (MM-SPE). In this approach ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate [C4mim][PF6] play an important role to extract the cadmium-4-(2-thiazolylazo)-resorcinol (Cd-TAR) complex from acid digested sample solutions and ultrasonic irradiation was applied to assist emulsification. After then, dispersed small amount of Fe3O4 magnetic nanoparticles (MNPs) in sample solutions to salvaged the IL and complete phase separation was attained. Some analytical parameters that influencing the efficiency of proposed (IL-UA-DMME) method, such as pH, volume of IL, ligand concentration, ultra-sonication time, amount of Fe3O4 MNPs, sample volume and matrix effect were optimized. Limit of detection (LOD) and enrichment factor (EF) of the method under optimal experimental conditions were found to be 0.40μgL(-1) and 100, respectively. The relative standard deviation (RSD) of 50μgL(-1) Cd was 4.29%. The validity and accuracy of proposed method, was assessed to analyzed certified reference materials of fortified lake water TMDA-54.4, SPS-WW2 waste water, spinach leaves 1570a and also checked by standard addition method. The obtained values showed good agreement with the certified values and sufficiently high recovery were found in the range of 98.1-101% for Cd. The proposed method was facile, rapid and successfully applied for the determination of Cd in environmental and different biological samples. PMID

  2. 磁化焙烧法强化高岭土磁选除铁增白工艺研究∗%Processes study on magnetization roasting method to strengthen whitening kaolin by magnetic separating removal iron method

    Institute of Scientific and Technical Information of China (English)

    夏光华; 陈翌斌; 何婵; 周翔宇; 张晓林

    2015-01-01

    采用磁化焙烧工艺,以自制碱法活性竹炭为磁化焙烧还原剂,研究了添加剂、焙烧温度、保温时间对高岭土中含铁矿物质量磁化率的影响,最终确定磁化焙烧工艺的最佳方案:2.0%硼酸和3.0% NaHCO3,磁化焙烧温度450℃,保温时间30 min,高岭土中含铁矿物的质量磁化率达5.58×10-4 m3/kg.经磁化焙烧工艺对处理后的高岭土进行湿法球磨,当浆料体系在pH 值为9,球磨时间为30 min时,磁选精矿磁选产率可达84.4%,此时磁选高岭土精矿的煅烧白度(温度1200℃)为87.4%,比未处理高岭土煅烧白度64.8%提高幅度22.6%,比传统化学漂白高岭土的煅烧白度73.2%提高幅度14.2%.%The experiment used magnetic roasting process,took bamboo charcoal powder that was dealt with base activator as magnetic roasting reducing agent.It studied that additive,sintering temperature,and holding time had some effects on mass susceptibility of iron mineral in kaolin.Determined finally the best solution of magnetic roasting process was that it was added 2.0% boric acid and 3.0% NaHCO3 ,its magnetic roasting tem-perature was about 450 ℃,its holding time was 30 min,and mass susceptibility of iron mineral in kaolin reached 5.58×10-4 m3/kg.To kaolin after treatment of magnetic roasting process,it was necessary to deal with it by wet milling.When the pH value in the slurry system was about 9 and milling time was about 30 min.The production rate of magnetic separation was up to 84.4%.And this time the calcined whiteness of magnetic kaolin concentrate (Temperature was 1 200 ℃)was 87.4%.It increased by 22.6% than calcined whiteness 71.3% of untreated kaolin sample,it increased by 14.2% than calcined whiteness 76.5% of original kaolin sample.

  3. Supramolecular control of the spin-dependent dynamics of long-lived charge-separated states at the micellar interface as studied by magnetic field effect.

    Science.gov (United States)

    Miura, Tomoaki

    2013-05-30

    Spin selectivity in long-lived charge separation at the micellar interface is studied using the magnetic field effect (MFE). An amphiphilic viologen is complexed with a nonionic surfactant to form a supramolecular acceptor cage, of which the size is controlled by the acceptor concentration, as confirmed by dynamic light scattering measurement. Photoinduced electron transfer (ET) from a guest polyaromatic molecule to the viologen moiety is observed spin-dependently with time-resolved fluorescence (trFL) and transient absorption (TA). A negative MFE on the radical yield is successfully observed, which indicates generation of singlet-born long-lived radical pair that is realized by supramolecular control of the donor-acceptor (D-A) distances. The dominance of the singlet-precursor MFE is sensitive to the acceptor concentration, which presumably affects the D-A distance as well as the cage size. However, theoretical analysis of the MFE gives large recombination rates of ca. 10(8) s(-1), which indicate the contribution of spin-allowed recombination of the pseudocontact radical pair generated by still active in-cage diffusion. Dependence of the viologen concentration and alkyl chain length on the recombination and escape dynamics is discussed in terms of precursor spin states and the microenvironments in the cage.

  4. Separation of multiple-quantum signals with different orders along with frequency axis in Raman magnetic resonance spectroscopy in heteronuclear systems

    Institute of Scientific and Technical Information of China (English)

    缪希茄; 卢广; 叶朝辉

    1997-01-01

    One-dimensional multiple-quantum spectroscopy with Raman magnetic resonance (RMR) in het-eronuclear systems was described by the product operator formalism in detail.The effects of the field strength and the frequency offset of the irradiation introduced during the detection period on the intensities and the resonant frequencies of the multiple-quantum signals in RMR spectra were investigated extensively by this product operator formalism.The results predicted by the formalism showed that the multiple-quantum signals in RMR spectroscopy had a higher sensitivity when a smaller frequency offset of irradiation field was employed.However,this situation would complicate the assignment and the separation of the multiple-quantum signals in different orders along the frequency axis in RMR spectra.On the other hand,a larger strength of the irradiation field would result in decoupling and therefore would obscure the detection of the multiple-quantum signals.In the meantime,a much weaker RF field might greatly dec

  5. 3D-printed biosensor with poly(dimethylsiloxane) reservoir for magnetic separation and quantum dots-based immunolabeling of metallothionein.

    Science.gov (United States)

    Heger, Zbynek; Zitka, Jan; Cernei, Natalia; Krizkova, Sona; Sztalmachova, Marketa; Kopel, Pavel; Masarik, Michal; Hodek, Petr; Zitka, Ondrej; Adam, Vojtech; Kizek, Rene

    2015-06-01

    Currently, metallothioneins (MTs) are extensively investigated as the molecular biomarkers and the significant positive association of the MT amount was observed in tumorous versus healthy tissue of various types of malignant tumors, including head and neck cancer. Thus, we proposed a biosensor with fluorescence detection, comprising paramagnetic nanoparticles (nanomaghemite core with gold nanoparticles containing shell) for the magnetic separation of MT, based on affinity of its sulfhydryl groups toward gold. Biosensor was crafted from PDMS combined with technology of 3D printing and contained reservoir with volume of 50 μL linked to input (sample/detection components and washing/immunobuffer) and output (waste). For the immunolabeling of immobilized MT anti-MT antibodies conjugated to CdTe quantum dots through synthetic heptapeptide were employed. After optimization of fundamental conditions of the immunolabeling (120 min, 20°C, and 1250 rpm) we performed it on a surface of paramagnetic nanoparticles in the biosensor reservoir, with evaluation of fluorescence of quantum dots (λexc 400 nm, and λem 555 nm). The developed biosensor was applied for quantification of MT in cell lines derived from spinocellular carcinoma (cell line 122P-N) and fibroblasts (122P-F) and levels of the biomarker were found to be about 90 nM in tumor cells and 37 nM in fibroblasts. The proposed system is able to work with low volumes (< 100 μL), with low acquisition costs and high portability. PMID:25735231

  6. Magnetic BaFe{sub 12}O{sub 19} nanofiber filter for effective separation of Fe{sub 3}O{sub 4} nanoparticles and removal of arsenic

    Energy Technology Data Exchange (ETDEWEB)

    Byun, Jeehye; Patel, Hasmukh A.; Yavuz, Cafer T., E-mail: yavuz@kaist.ac.kr [Korea Advanced Institute of Science and Technology (KAIST), Graduate School of EEWS (Korea, Republic of)

    2014-12-15

    Magnetic nanoparticles are promising in applications where magnetic separation is intended, although material losses via leaching mechanisms are often inevitable. Magnetic separations with widely available permanent magnets can effectively trap particles, leading to a complete removal of used or waste particles. In this report, we first demonstrate the synthesis of the thinnest (112.7 ± 16.4 nm) and most magnetic (71.96 emu g{sup −1}) barium hexaferrite (BaFe{sub 12}O{sub 19}, BHF—fridge magnet) via an organic solvent-free electrospinning procedure. When the fibers are then packed into a column, they clearly remove 12 nm magnetite (Fe{sub 3}O{sub 4}) nanoparticles quantitatively. The same BHF cartridge also removes more than 99.9 % As-treated magnetite nanoparticles at capacities up to 70 times of its weight. As a result, one liter of 150 μg L{sup −1} As-contaminated water can be purified rapidly at a material cost of less than 2 US cents.

  7. EFFICIENCY OF METAL SCRAP SEPARATION IN EDDY CURRENT SEPARATOR

    OpenAIRE

    Gordan Bedeković; Branko Salopek; Ivan Sobota

    2008-01-01

    Eddy-current separation is most often method used for the recovery of non-ferrous metals (Al, Cu, Zn, Pb) from solid wastes and also for separating non-ferrous metals from each other. The feed material comes to rotary drum and magnetic field by belt conveyer. The changing magnetic field induce eddy currents in conductive (metallic) particles. Because interaction between this currents and the magnetic field electrodynamic forces will act on conductive particles. Therefore the trajectories of c...

  8. MAGNET

    CERN Multimedia

    Benoit Curé

    The magnet subsystems resumed operation early this spring. The vacuum pumping was restarted mid March, and the cryogenic power plant was restarted on March 30th. Three and a half weeks later, the magnet was at 4.5 K. The vacuum pumping system is performing well. One of the newly installed vacuum gauges had to be replaced at the end of the cool-down phase, as the values indicated were not coherent with the other pressure measurements. The correction had to be implemented quickly to be sure no helium leak could be at the origin of this anomaly. The pressure measurements have been stable and coherent since the change. The cryogenics worked well, and the cool-down went quite smoothly, without any particular difficulty. The automated start of the turbines had to be fine-tuned to get a smooth transition, as it was observed that the cooling power delivered by the turbines was slightly higher than needed, causing the cold box to stop automatically. This had no consequence as the cold box safety system acts to keep ...

  9. MAGNET

    CERN Multimedia

    B. Curé

    During the winter shutdown, the magnet subsystems went through a full maintenance. The magnet was successfully warmed up to room temperature beginning of December 2008. The vacuum was broken later on by injecting nitrogen at a pressure just above one atmosphere inside the vacuum tank. This was necessary both to prevent any accidental humidity ingress, and to allow for a modification of the vacuum gauges on the vacuum tank and maintenance of the diffusion pumps. The vacuum gauges had to be changed, because of erratic variations on the measurements, causing spurious alarms. The new type of vacuum gauges has been used in similar conditions on the other LHC experiments and without problems. They are shielded against the stray field. The lubricants of the primary and diffusion pumps have been changed. Several minor modifications were also carried out on the equipment in the service cavern, with the aim to ease the maintenance and to allow possible intervention during operation. Spare sensors have been bought. Th...

  10. 强磁性矿粒在磁选过程中的受力分析及动力学模拟%Force analysis and dynamic simulation of ferromagnetic mineral particles in magnetic separation process

    Institute of Scientific and Technical Information of China (English)

    库建刚; 陈辉煌; 何逵; 晏全香

    2015-01-01

    基于磁偶极子磁场分布理论计算强磁性矿粒在磁场中所受到的力,并采用Verlet速度算法对2个磁性矿粒相互作用和9个磁性矿粒相互作用的二维动态过程进行模拟。研究结果表明:磁偶极子力和黏性阻力是影响磁性矿粒团聚的主要因素,磁偶极子力是强磁性矿粒在磁选过程中受到的最主要的力;2个磁性矿粒相互作用的动态过程由外磁场的大小和方向决定,矿粒从初始位置到接触所用时间小于8.3 ms;9个矿粒相互作用的动态过程与初始位置(随机性)有关,矿粒从初始位置到结成磁链所用时间小于30 ms,磁性矿粒最终沿外磁场方向团聚成链状结构。%Based on magnetic dipole magnetic field distributing theory, forces acting on ferromagnetic mineral particles in magnetic field were calculated. The Velocity Verlet algorithm was adopted to simulate the two-dimensional dynamic interaction of two magnetic particles and nine magnetic particles respectively. The results show that the magnetic interaction force and viscous drag are the primary factors affecting the agglomeration of magnetic particles and the magnetic dipole force is the main force acting on ferromagnetic mineral particles in magnetic separation process. Furthermore, the dynamic processof the interaction between two magnetic particles is determined by the strength and direction of the external magnetic field. The time it takes for the two magnetic mineral particles to meet each other from the initial position is less than 8.3 ms. Additionally, the dynamic processof the interaction of nine magnetic particles is affected by the initial position (randomly assigned) and the time for the nine particles to form magnetic chains from the initial position is less than 30 ms. Magnetic mineral particles eventually agglomerate into chain aggregate structure along the direction of external magnetic field.

  11. Application of Magstream in Mineral Sands Separation

    OpenAIRE

    Kojovic, T.

    1994-01-01

    The Magstream separation process, developed by Intermagnetics General corporation, offers an alternative method for both laboratory and plant mineral separations. It is based on the concept of using a fluid whose effective density is magnetically derived. The separator can be applied to both purely gravimetric separation of non–magnetic materials and magnetic–gravimetric separation of paramagnetic material.The separation density can be easily adjusted by changing the speed of rotation or proc...

  12. Application and Practice of the Combined Thick Coils in Magnetic Separators%厚壁组合线圈在磁选设备中的应用与实践

    Institute of Scientific and Technical Information of China (English)

    陈中航; 赵通林; 陈广振

    2012-01-01

    磁选柱是一种新型高效的磁选设备,通过磁聚合-分散及旋转上升水流作用,使磁铁矿颗粒受到磁力和流体力的联合作用,能有效破坏磁团聚,分离出单体脉石和夹杂的连生体,提高精矿品位和降低SiO2含量.磁选柱的电磁磁系是由几组均匀电流密度厚壁线圈组合而成,通过线圈的有效配置,产生特殊的磁场.本研究从分析磁选柱的厚壁线圈入手,首先介绍了三种常规线圈的结构、电流密度特征及其功率因子的大小,然后以均匀电流密度线圈为例对线圈的组合方式进行了简要分析,在此基础上研究了磁选柱励磁线圈的磁场特性及分选原理.磁选柱应用在本钢南芬选矿厂铁精矿提铁降硅技术改造中,改造后精矿品位由67.50%提高到69%以上,SiO2含量由6.5%降低到4.5%以下,证实了其在磁铁矿选矿厂工艺流程中的巨大作用.%Column magnetic separator is a new type high efficiency magnetic separator,by a combined effect of magnetic and hydraulic forces exerted on the magnetic particles through magnetic agglomeration - dispersion and swirling rising flow,, it can effectively separate the liberated gangue and intergrowth particles so as to raise the iron grade and reduce the content of SiO2 in the concentrate. The magnetic system of column magnetic separator is composed of several groups of thick coils. Through the reasonable combination of the thick coils, specific magnetic field are produced. From the analysis of the thick coil of the column magnetic separator, the structure, the current density property and the size of power factor of the three kinds of conventional coil structure were introduced firstly, then taking the uniform current density coil as an example, the combination of the coils was briefly analyzed. Based on this,the magnetic field characteristics and separating principle of the excitation coil were studied. When the column magnetic separator was applied to the

  13. 用高梯度磁分离技术控制钢铁企业颗粒物的分析%Discussion on application of high gradient magnetic separation technology for particulate matter control in steel industry

    Institute of Scientific and Technical Information of China (English)

    赵亮; 邓堃; 孙文强; 李小玲; 张革; 黄健

    2016-01-01

    According to the existing research results all over the world, the magnetic properties of iron and steel enterprises particles was firstly illustrated, then the basic principle of high gradient magnetic separation technology and the influence factors of gradient magnetic separation effect were expounded, finally the existing problems and development prospects of the high gradient magnetic separation tech-nology used in iron and steel enterprises particles were explained, especially for the feasibility of PM10 and PM2.5 control.%文章结合国内外现有的研究成果,首先说明钢铁企业颗粒物的磁特性,其次阐述高梯度磁分离技术的基本原理,分析梯度磁场分离效果的影响因素,最后说明了高梯度磁分离技术用于钢铁企业颗粒物,尤其是对于PM10和PM2.5控制的可行性,存在问题以及发展前景。

  14. 难选赤褐铁矿焙烧-磁选探索性试验研究%Experimental study on magnetic roasting-separation of refractory hematite limonite

    Institute of Scientific and Technical Information of China (English)

    关翔

    2012-01-01

    In this paper, tests of mineral processing were finished on the ref ractory hematite limonite of Shanxi with iron content about 24. 05%, rate of magnetism (FeO/ Tfe) about 0. 6%. Grindability and tech-nique of mineralogy of this iron ore were described. The major study was put attention on efficiency of magnetic separation at high intensity and reducing roasting-magnetic separation. Tests of reducing roasting-magnetic separation could attained good results as: concentrate iron grade be about to 58%, recovery of iron above 60%.%对某含铁品位为24.05%、磁性率(FeO/ TFe)为0.6%的难选赤褐铁矿矿石进行了选矿试验研究.考查了该矿石的矿物工艺学和磨矿特性,重点研究了还原焙烧-磁选分选情况.确定还原焙烧-磁选可以获得较好的选别指标为:精矿铁品位达58%以上,铁回收率60%以上.

  15. Research into a kind of manganese-containing fine grained limonite ore by magnetizing roast-magnetic separation process%某细粒含锰褐铁矿焙烧-磁选试验研究

    Institute of Scientific and Technical Information of China (English)

    刘红召; 王威; 王守敬; 曹耀华; 高照国

    2015-01-01

    According to the characteristics that the disseminated extent of iron mineral was fine ,the content of manganese was high ,the magnetizing roast followed by magnetic separation process was adopted to utilizing the iron for a kind of manganese‐containing fine grained limonite ore in Hunan province .Based on XRD analyses and microstructure analysis ,the mineral composition and dissemination relationship of roasting product were discussed .By the optimum conditions that the roasting temperature 850℃ ,the roasting time 60min ,the quantity of coal addition 4% ,the particle size of grinding -44μm 85% ~90% ,the magnetic field intensity 159kA/m ,and by three‐stage cleaning ,the iron concentrate ,with the grade of iron was 55 .72% ,the grade of Mn was 7 .03% and the recovery of Fe was 80 .84% ,was gained .In the roasting product the main minerals were magnetite and manganese oxides .Most of the magnetite was fine grained , exited in the aggregates forms with manganese mineral and gangue .The magnetite was very difficult to be liberated because of the special existing form .%湖南某含锰铁矿铁矿物嵌布粒度细、锰含量高,本文采用磁化焙烧‐磁选工艺进行铁的可利用性研究,并对磁化焙烧产品进行了X射线衍射分析和显微形貌分析。研究表明,在焙烧温度为850℃、时间60min、煤炭加入量4%条件下得到的磁化焙烧产品,控制磨矿细度-325目85%~90%,在159kA/m的磁选场强下,经过三次精选,可以得到铁品位55.72%、锰品位为7.03%的铁精矿,铁回收率达到80.84%;磁化焙烧产品中主要矿物为磁铁矿,大部分的磁铁矿嵌布粒度细,与锰矿物、脉石以集合体的形式存在,磁铁矿难以实现单体解离。

  16. Synthesis of magnetically separable Bi2O4/Fe3O4 hybrid nanocomposites with enhanced photocatalytic removal of ibuprofen under visible light irradiation.

    Science.gov (United States)

    Xia, Dehua; Lo, Irene M C

    2016-09-01

    Ibuprofen (IBU) is one of the representative persistent organic pollutants (POPs) which can cause severe adverse effects in humans and wildlife. Therefore, effectively removing IBU from water is a worldwide necessity. In this study, a novel superparamagnetic Bi2O4/Fe3O4 nanocomposite was successfully prepared by an in-situ growth method and utilized for photocatalytic removal of IBU. The structural characterization of the Bi2O4/Fe3O4 nanocomposite indicates that the monodisperse Fe3O4 nanoparticles of diameter 10 nm are highly assembled on the Bi2O4 nanorods of diameter 120 nm. Under visible light irradiation, using an optimum molar ratio of Bi2O4/Fe3O4 (1:2.5) resulted in a complete photocatalytic degradation of IBU within 2 h, which is a 1.7 times higher efficiency than pure Bi2O4, and a complete mineralization of IBU with a prolonged irradiation time of 4 h. In addition, the potential practicality of Bi2O4/Fe3O4 (1:2.5) was also demonstrated by the efficient photocatalytic degradation of IBU in actual drinking water. The photocatalytic mechanisms of Bi2O4/Fe3O4 (1:2.5) were revealed, indicating that the enhanced photocatalytic performance was mainly attributed to the accelerated separation of electron-hole pairs after surface modification of Fe3O4, and that the photogenerated h(+) was the primary reactive species for the photocatalytic removal of IBU. Furthermore, the Bi2O4/Fe3O4 (1:2.5) can be magnetically recycled and shows good reusability without significant loss of photocatalytic activity or structural change even after reuse over five cycles, showing a promising application for the photocatalytic degradation of POPs from water. PMID:27219049

  17. Kinetic analysis of single-particle pulverized coal during high-gradient magnetic separation%高梯度磁选中单颗粒微粉煤的动力学分析

    Institute of Scientific and Technical Information of China (English)

    刘鹏; 焦红光

    2012-01-01

    为了建立气固流态化磁选过程中颗粒群的相互作用模型,优化了高梯度磁选设备工作参数,在单颗粒微粉煤比磁化率一定的条件下,通过对高梯度磁选中单颗粒球形微粉煤的动力学分析,建立了气固流态化分选过程中的单颗粒煤粉运动的动态数学模型;进而探索出聚磁介质当量直径的临界模型,并分析了单颗粒微粉煤被捕集到聚磁介质上时相对气体流速的运动速度。%To establish the model of granule group interaction during gas-solid fluidization magnetic separa- tion, the paper optimized the operation parameters of the high-gradient magnetic separation equipment. On thecondition of keeping the specific magnetic susceptibility constant, through kinetic analysis of the spherical sin- gle-particle pulverized coal during high-gradient magnetic separation, a dynamic mathematical model of single- particle pulverized coal during gas-solid fluidization magnetic separation was established. And then the critical model of the equivalent diameter of the magnetic medium was achieved. Finally the relative gas flow velocity of single-particle pulverized coal was analyzed when single-particle pulverized coal was trapped onto the mag- netic medium.

  18. Effect of Magnetic Carrier NiFe2O4 Nanoparticles on Physicochemical and Catalytic Properties of Magnetically Separable Photocatalyst TiO2/NiFe2O4

    Institute of Scientific and Technical Information of China (English)

    XU Shi-hong; TAN Dong-dong; BI De-fu; SHI Peng-hui; LU Wei; SHANGGUAN Wen-feng; MA Chun-yan

    2013-01-01

    A series of magnetically separable photocatalyst TiO2/NiFe2O4(TN) with different mass ratios of NiFe2O4 to TiO2 was prepared by sol-gel method.The X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),ultraviolet-visible spectroscopy(UV-Vis),Brunauer-Emmett-Teller(BET) surface analysis and photoluminescence spectroscopy(PL) were used to characterize the photocatalyst TN.The XRD patterns of TN indicate that adulterating a smidgen of NiFe2O4 into TiO2(about 0.1%,mass ratio) can promote the phase transformation of TiO2,however,when the doped amount of NiFe2O4 surpasses 1%,the introduction of NiFe2O4 can inhibit the growth of TiO2 crystal grain and reduce the size of TiO2 crystal grain.The XPS results of TN indicate that some Fe3+ replace Ti4+ of the TiO2 lattice forming Fe—O—Ti bonds.The PL analysis of TN shows that the NiFe2O4 nanoparticles in photocatalyst TN play the role of the effective recombination centre of the photogenerated electrons and holes,leading to the decrease in photocatalytic activity.

  19. MAGNET

    CERN Multimedia

    Benoit Curé

    The cooling down to the nominal temperature of 4.5 K was achieved at the beginning of August, in conjunction with the completion of the installation work of the connection between the power lines and the coil current leads. The temperature gradient on the first exchanger of the cold box is now kept within the nominal range. A leak of lubricant on a gasket of the helium compressor station installed at the surface was observed and several corrective actions were necessary to bring the situation back to normal. The compressor had to be refilled with lubricant and a regeneration of the filters and adsorbers was necessary. The coil cool down was resumed successfully, and the cryogenics is running since then with all parameters being nominal. Preliminary tests of the 20kA coil power supply were done earlier at full current through the discharge lines into the dump resistors, and with the powering busbars from USC5 to UXC5 without the magnet connected. On Monday evening August 25th, at 8pm, the final commissionin...

  20. MAGNET

    CERN Multimedia

    Benoit Curé

    2013-01-01

    Maintenance work and consolidation activities on the magnet cryogenics and its power distribution are progressing according to the schedules. The manufacturing of the two new helium compressor frame units has started. The frame units support the valves, all the sensors and the compressors with their motors. This activity is subcontracted. The final installation and the commissioning at CERN are scheduled for March–April 2014. The overhauls of existing cryogenics equipment (compressors, motors) are in progress. The reassembly of the components shall start in early 2014. The helium drier, to be installed on the high-pressure helium piping, has been ordered and will be delivered in the first trimester of 2014. The power distribution for the helium compressors in SH5 on the 3.3kV network is progressing. The 3.3kV switches, between each compressor and its hot spare compressor, are being installed, together with the power cables for the new compressors. The 3.3kV electrical switchboards in SE5 will ...