Back extensor muscle endurance test scores in coal miners in Australia

Energy Technology Data Exchange (ETDEWEB)

Stewart, M.; Latimer, J.; Jamieson, M. [University of Sydney, Sydney, NSW (Australia). Faculty of Health and Science, School of Physiotherapy

2003-06-01

Low back pain is a common complaint among those working in the Australian coal mining industry. One test that may be predictive of first-time episodes of low back pain is the Biering-Sorensen test of back extensor endurance strength. While this test has been evaluated in overseas sedentary populations, normative data and the discriminative ability of the test have not been evaluated with coal miners. Eighty-eight coal miners completed a questionnaire for known risk factors for low back pain, performed the Biering-Sorensen test, and undertook a test of aerobic fitness. Data analysis was performed to describe the groups and to determine whether any significant difference existed between those with a past history of low back pain and those without. Significantly lower than expected holding times were found in this group of coal miners (mean 113 s). This result was significantly lower than demonstrated in previous studies. When holding times for those with a past history of low back pain were compared with times for those with no history of low back pain, the difference was not statistically significant, nor was there a significant difference in fitness between those with a past history of low back pain and those without. It is concluded that coal miners in Australia have lower than normal Biering-Sorensen holding times. This lower back holding time does not differ between coal miners with a past history of low back pain and those without.

Characterization of Rare Earth Element Minerals in Coal Utilization Byproducts

Energy Technology Data Exchange (ETDEWEB)

Montross, Scott N. [Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States); Verba, Circe A. [National Energy Technology Lab. (NETL), Albany, OR (United States). Research Innovation Center; Collins, Keith [National Energy Technology Lab. (NETL), Albany, OR (United States). Research Innovation Center

2017-07-17

The United States currently produces over 100 million tons of coal utilization byproducts (CUB) per year in the form of fly ash, bottom ash, slag, and flue gas (American Coal Ash Association (ACCA), 2015). But this “waste material” also contains potentially useful levels of rare earth elements (REE). Rare earth elements are crucial for many existing and emerging technologies, but the U.S. lacks a domestic, sustainable REE source. Our project explored the possibility of developing a supply of REEs for U.S. technologies by extracting REEs from CUBs. This work offers the potential to reduce our dependence on other countries for supply of these critical elements (NETL, REE 2016 Project Portfolio). Geologic and diagenetic history, industrial preparation methods, and the specific combustion process all play major roles in the composition of CUB. During combustion, inorganic mineral phases of coal particles are fluidized at temperatures higher than 1400oC, so inorganic mineral materials are oxidized, fused, disintegrated, or agglomerated into larger spherical and amorphous (non-crystalline) particles. The original mineralogy of the coal-containing rock and heating/cooling of the material significantly affects the composition and morphology of the particles in the combustion byproduct (Kutchko and Kim, 2006). Thus, different types of coal/refuse/ash must be characterized to better understand mineral evolution during the combustion process. Our research focused on developing a working model to address how REE minerals behave during the combustion process: this research should help determine the most effective engineering methods for extracting REEs from CUBs. We used multimodal imaging and image processing techniques to characterize six rock and ash samples from different coal power plants with respect to morphology, grain size, presence of mineral phases, and elemental composition. The results of these characterization activities provided thresholds for realizing the

Distribution of Clay Minerals in Light Coal Fractions and the Thermal Reaction Products of These Clay Minerals during Combustion in a Drop Tube Furnace

Directory of Open Access Journals (Sweden)

Sida Tian

2016-06-01

Full Text Available To estimate the contribution of clay minerals in light coal fractions to ash deposition in furnaces, we investigated their distribution and thermal reaction products. The light fractions of two Chinese coals were prepared using a 1.5 g·cm−3 ZnCl2 solution as a density separation medium and were burned in a drop-tube furnace (DTF. The mineral matter in each of the light coal fractions was compared to that of the relevant raw coal. The DTF ash from light coal fractions was analysed using hydrochloric acid separation. The acid-soluble aluminium fractions of DTF ash samples were used to determine changes in the amorphous aluminosilicate products with increasing combustion temperature. The results show that the clay mineral contents in the mineral matter of both light coal fractions were higher than those in the respective raw coals. For the coal with a high ash melting point, clay minerals in the light coal fraction thermally transformed more dehydroxylation products compared with those in the raw coal, possibly contributing to solid-state reactions of ash particles. For the coal with a low ash melting point, clay minerals in the light coal fraction produced more easily-slagging material compared with those in the raw coal, playing an important role in the occurrence of slagging. Additionally, ferrous oxide often produces low-melting substances in coal ash. Due to the similarities of zinc oxide and ferrous oxide in silicate reactions, we also investigated the interactions of clay minerals in light coal fractions with zinc oxide introduced by a zinc chloride solution. The extraneous zinc oxide could react, to a small extent, with clay minerals in the coal during DTF combustion.

30 CFR 750.21 - Coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal extraction incidental to the extraction of... ENFORCEMENT, DEPARTMENT OF THE INTERIOR INDIAN LANDS PROGRAM REQUIREMENTS FOR SURFACE COAL MINING AND RECLAMATION OPERATIONS ON INDIAN LANDS § 750.21 Coal extraction incidental to the extraction of other minerals...

Cervical spine degenerative changes (narrowed intervertebral disc spaces and osteophytes) in coal miners

International Nuclear Information System (INIS)

Zejda, J. E.; Stasiow, B.

2003-01-01

A series of 685 x-rays films of the cervical spine obtained in coal miners was analyzed to explore the occurrence of narrowed disc spaces and osteophytes in this occupational group, and to examine the association of x-rays changes with age, duration of employment, and duration of occupational exposure to hand-arm vibration. All data were extracted from individual medical files of coal miners examined for suspected hand-arm vibration-related disorders in 1989-1999 at the Occupational Medicine Center in Katowice. The narrowed intervertebral disc spaces were found in 188 coal miners (26.9%) and osteophytes in 332 coal miners (47.5%). The occurrence of degenerative changes in coal miners was similar to that observed in a small group of 68 blue-collar workers (no exposure to hand-arm vibration) employed in the coal industry. Univariate comparisons showed that intervertebral disc spaces and osteophytes were more frequent among older subjects and among subjects with longer duration of employment. The results of logistic regression analysis confirmed statistically significant effect of age, but not of other factors included in the model. When both x-ray changes were grouped together (a combined dependent variable) age remained the only statistically significant explanatory variable. The findings do not support the view that the examined degenerative changes in cervical spine are more prevalent in coal miners and depend on duration of physical work or local exposure to hand-arm vibration in this occupational group. (author)

Removal of mineral oil and wastewater pollutants using hard coal

Directory of Open Access Journals (Sweden)

BRANISLAV R. SIMONOVIĆ

2009-05-01

Full Text Available This study investigates the use of hard coal as an adsorbent for removal of mineral oil from wastewater. In order to determine the efficiency of hard coal as an adsorbent of mineral oil, process parameters such as sorption capacity (in static and dynamic conditions, temperature, pH, contact time, flow rate, and chemical pretreatment were evaluated in a series of batch and continuous flow experiments. There were significant differences in the mineral oil removal for various pH values examined. The adsorption of mineral oil increased as pH values diverged from 7 (neutral. At lower temperatures, the adsorption was notably higher. The wastewater flow rate was adjusted to achieve optimal water purification. Equilibrium was reached after 10 h in static conditions. At that time, more than 99% of mineral oil had been removed. At the beginning of the filtering process, the adsorption rate increased rapidly, only to show a minor decrease afterwards. Equilibrium data were fitted to Freundlich models to determine the water-hard coal partitioning coefficient. Physical adsorption caused by properties of the compounds was the predominant mechanism in the removal process.

In the pit: a Cape Breton coal miner

Energy Technology Data Exchange (ETDEWEB)

MacKenzie, R.; Caplan, R. (ed.)

2001-07-01

This is an account of the mining life of a coal miner in Nova Scotia from 1951 to 1969. The author was born in New Waterford and worked there, in Numbers 12 and 18 Colliery. Many of his experiences and observations from working at the coal face are described. These include accounts of hauling coal in the pit, driving a diesel, and the coming of mechanization. Mining community life is included as background material. A brief history of 12 Colliery (1908-1975) is included. 12 figs.

Biering-Sorensen test scores in coal miners

Energy Technology Data Exchange (ETDEWEB)

Tekin, Y.; Ortancil, O.; Ankarali, H.; Basaran, A.; Sarikaya, S.; Ozdolap, S. [Zonguldak Karaelmas University, Zonguldak (Turkey)

2009-05-15

Biering-Sorensen test is an isometric back endurance test. Biering-Sorensen test scores have varied in different cultural and occupational groups. The aims of this study were to collect normative data on Biering-Sorensen holding times, to determine the discriminative ability of the Biering-Sorensen test in Turkish coal miners, and to examine the association between Biering-Sorensen test result and functional disability. One hundred and fifty male coal miners participated in this study. Trunk extensor muscle strength was measured using the Biering-Sorensen test. Oswestry disability index was used to measure the functional disability level of low back pain. The mean Biering-Sorensen holding time for the total subject group was 107.3 {+-} 22.5 s. The mean time of Biering-Sorensen test of the subjects with and without low back pain were 99.9 {+-} 19.8 and 128.6 {+-} 15.2 s, respectively. The difference between the subjects with and without low back pain was statistically significant (p < 0.001). There was a statistically significant negative correlation between Oswestry functional disability score and Biering-Sorensen holding time (R = -0.824, p < 0.001). Turkish coal miners have low mean back extensor endurance holding times. Biering-Sorensen test had a good discriminative ability in our study group. Trunk muscle strength has a significant effect on the disability level of low back pain. Thus trunk muscle endurance training exercise therapy may be effective for the reduction of disability in patients with low back pain.

Study of blood pressure among coal miners

Energy Technology Data Exchange (ETDEWEB)

Chandon; Dhar, B.B.; Singh, A.K.P.; Sahay, L.K. [Central Mining Research Institute, Dhanbad (India)

1997-12-31

The aim of the work was to assess the prevalence of hypertension among 2772 coal miners and to establish the relationship of hypertension with family history, living conditions, dietary habits, and other associated medical parameters. 4 refs., 5 tabs.

Spirometry in a population of coal miners in Paipa, Colombia

Directory of Open Access Journals (Sweden)

Nubia González

2017-12-01

Conclusions: Spirometry is a useful test for detecting the presence of respiratory disorders in the population of coal miners. The time of exposure was significantly associated with the respiratory disease exhibited by these miners.

Assessment of subclinical right ventricular systolic dysfunction in coal miners using myocardial isovolumic acceleration.

Science.gov (United States)

Ozcan Abacıoglu, Ozge; Kaplan, Mehmet; Abacıoglu, Serkan; Quisi, Ala

2017-09-01

Several studies have been conducted regarding the effects of coal mining on the respiratory system. However, there is a lack of data concerning potential effects of coal mining on the cardiovascular system. In this study, we aimed to evaluate the potential subclinical right and left ventricular dysfunction in coal miners. This single-center, prospective study included a total of 102 patients. Patient and control groups consisted of 54 coal miners and 48 healthy men, respectively. All patients underwent 12-lead electrocardiography, transthoracic echocardiography, and pulmonary function test. As compared to control group, coal miners had significantly higher right ventricular myocardial performance index (RVMPI) (0.41 ± 0.03 vs 0.37 ± 0.02, P right ventricular fractional area change (RVFAC) (33.55% ± 6.70% vs 37.04 ± 9.26 P right and left ventricular dysfunction, including RVMPI, RVFAC, TAPSE, IVA, and AD, are impaired in coal miners. © 2017 The Authors Echocardiography Published by Wiley Periodicals, Inc.

Diffuse interlobular septal thickening in a coal miner

Energy Technology Data Exchange (ETDEWEB)

Thrumurthy, S.G.; Kearney, S.; Sissons, M.; Haider, Y. [Lancashire Teaching Hospital for NHS Funding Trust, Chorley (United Kingdom)

2010-01-15

Diffuse interlobular septal thickening (DIST) is an abnormality seen on high-resolution CT (HRCT) scanning of the thorax. While DIST may be present to variable extents in a number of lung conditions, it is uncommon as a predominant finding except in a few entities. This report features an ex-coal miner, thought to have coal workers' pneumoconiosis (CWP), in whom the HRCT scan showed no evidence of CWP and instead showed DIST. The patient's condition progressed incessantly towards death from severe secondary pulmonary hypertension. The case links fatal pulmonary hypertension to DIST, a pattern not previously described in coal workers.

Prevalence and Associated Factors of Depressive Symptoms among Chinese Underground Coal Miners

Directory of Open Access Journals (Sweden)

Li Liu

2014-01-01

Full Text Available Although underground coal miners are quite susceptible to depressive symptoms due to a highly risky and stressful working environment, few studies have focused on this issue. The purpose of the study was to evaluate the prevalence of depressive symptoms and to explore its associated factors in this population. A cross-sectional survey was conducted in a coal-mining population in northeast China. A set of self-administered questionnaires was distributed to 2500 underground coal miners (1,936 effective respondents. Depressive symptoms, effort-reward imbalance (ERI, overcommitment (OC, perceived physical environment (PPE, work-family conflict (WFC, and some demographic and working characteristics were measured anonymously. The prevalence of depressive symptoms was 62.8%, and the mean level was 20.00 (9.99. Hierarchical linear regression showed that marital status, education, monthly income, and weekly working time were significantly associated with depressive symptoms. A high level of depressive symptoms was significantly associated with high ERI, PPE, WFC, and OC. Accordingly, most Chinese underground coal miners probably have depressive symptoms that are mainly predicted by some occupational psychosocial factors. Efforts should be made to develop strategies to reduce ERI and OC, improve physical working environment, and care for workers’ family well-being, thereby mitigating the risk of depression among Chinese underground coal miners.

Lung cancer among coal miners, ore miners and quarrymen : smoking-adjusted risk estimates from the synergy pooled analysis of case-control studies

NARCIS (Netherlands)

Taeger, Dirk; Pesch, Beate; Kendzia, Benjamin; Behrens, Thomas; Jöckel, Karl-Heinz; Dahmann, Dirk; Siemiatycki, Jack; Kromhout, Hans; Vermeulen, Roel; Peters, Susan; Olsson, Ann; Brüske, Irene; Wichmann, Heinz-Erich; Stücker, Isabelle; Guida, Florence; Tardón, Adonina; Merletti, Franco; Mirabelli, Dario; Richiardi, Lorenzo; Pohlabeln, Hermann; Ahrens, Wolfgang; Landi, Maria Teresa; Caporaso, Neil; Pesatori, Angela Cecilia; Mukeriya, Anush; Szeszenia-Dabrowska, Neonila; Lissowska, Jolanta; Gustavsson, Per; Field, John; Marcus, Michael W; Fabianova, Eleonora; 't Mannetje, Andrea; Pearce, Neil; Rudnai, Peter; Bencko, Vladimir; Janout, Vladimir; Dumitru, Rodica Stanescu; Foretova, Lenka; Forastiere, Francesco; John McLaughlin, John McLaughlin; Paul Demers, Paul Demers; Bas Bueno-de-Mesquita, Bas Bueno-de-Mesquita; Joachim Schüz, Joachim Schüz; Kurt Straif, Kurt Straif; Brüning, Thomas

2015-01-01

OBJECTIVES: Working in mines and quarries has been associated with an elevated lung cancer risk but with inconsistent results for coal miners. This study aimed to estimate the smoking-adjusted lung cancer risk among coal miners and compare the risk pattern with lung cancer risks among ore miners and

30 CFR 947.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 947.702 Section 947.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... other minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of...

30 CFR 933.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 933.702 Section 933.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... other minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of...

30 CFR 939.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 939.702 Section 939.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... other minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of...

30 CFR 903.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 903.702 Section 903.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of Other...

30 CFR 912.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 912.702 Section 912.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of Other...

30 CFR 937.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 937.702 Section 937.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of Other...

30 CFR 921.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 921.702 Section 921.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... other minerals. Part 702 of the chapter, Exemption for Coal Extraction Incidental to the Extraction of...

30 CFR 905.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 905.702 Section 905.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... other minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of...

30 CFR 942.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 942.702 Section 942.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of Other...

30 CFR 910.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 910.702 Section 910.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of Other...

30 CFR 922.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 922.702 Section 922.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of Other...

30 CFR 941.702 - Exemption for coal extraction incidental to the extraction of other minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Exemption for coal extraction incidental to the extraction of other minerals. 941.702 Section 941.702 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... other minerals. Part 702 of this chapter, Exemption for Coal Extraction Incidental to the Extraction of...

Respirable coal dust exposure and respiratory symptoms in South-African coal miners: A comparison of current and ex-miners

Energy Technology Data Exchange (ETDEWEB)

Naidoo, R.N.; Robins, T.G.; Seixas, N.; Lalloo, U.G.; Becklake, M. [University of KwaZuluNatal, Congella (South Africa). Nelson R Mandela School of Medicine

2006-06-15

Dose-response associations between respirable dust exposure and respiratory symptoms and between symptoms and spirometry outcomes among currently employed and formerly employed South-African coal miners were investigated. Work histories, interviews, and spirometry and cumulative exposure were assessed among 684 current and 212 ex-miners. Results: Lower prevalences of symptoms were found among employed compared with ex-miners. Associations with increasing exposure for symptoms of phlegm and past history of tuberculosis were observed, whereas other symptom prevalences were higher in the higher exposure categories. Symptomatic ex-miners exhibited lower lung-function compared to the nonsymptomatic. Compared with published data, symptoms rates were low in current miners but high in ex-miners. Although explanations could include the low prevalence of smoking and/or reporting/selection bias, a 'Survivor' and/or a 'hire' effect is more likely, resulting in an underestimation of the dust-related effect.

Mineral distribution in two southwest colombian coals using cyclone separation and oxidation at low temperature

International Nuclear Information System (INIS)

Rojas Andres F; Barraza, Juan M; Rojas, Andres F.

2010-01-01

It was studied the mineral distribution of two Colombian coals using a cyclone separation and oxidation at low temperature, OLT. The cyclone separation was carried out at two densities (1.3 and 1.4), three particle size (1000+ 600?m, 600+ 425?m and 425+ 250?m) and two processing stages. To determine the mineral matter, feed and under flow fractions from hydrocyclone were concentrated in mineral matter by OLT in a fluidized bed (T<300 celsius degrade). 18 minerals were identified by X Ray Diffraction, XRD. XRD results showed 13 minerals from Golondrinas and 15 minerals from Guachinte coal. It was found that kaolinite and quartz were the most abundant minerals in coal fractions from Golondrinas and Guachinte. Furthermore, it was found that mainly minerals kaolinite, quartz, dolomite, jarosite, gypsum and pyrite, exhibited affinity towards mineral matter, while siderite and valerite showed affinity towards organic matter.

Radiographic outcomes among South African coal miners.

Science.gov (United States)

Naidoo, Rajen N; Robins, Thomas G; Solomon, A; White, Neil; Franzblau, Alfred

2004-10-01

This study, the first to document the prevalence of pneumoconiosis among a living South African coal mining cohort, describes dose-response relationships between coal workers' pneumoconiosis and respirable dust exposure, and relationships between pneumoconiosis and both lung function deterioration and respiratory symptoms. A total of 684 current miners and 188 ex-miners from three bituminous-coal mines in Mpumalanga, South Africa, was studied. Chest radiographs were read according to the International Labour Organization (ILO) classification by two experienced readers, one an accredited National Institute for Occupational Safety and Health (NIOSH) "B" reader. Interviews were conducted to assess symptoms, work histories (also obtained from company records), smoking, and other risk factors. Spirometry was performed by trained technicians. Cumulative respirable dust exposure (CDE) estimates were constructed from historical company-collected sampling and researcher-collected personal dust measurements. kappa-Statistics compared the radiographic outcomes predicted by the two readers. An average profusion score was used in the analysis for the outcomes of interest. Because of possible confounding by employment status, most analyses were stratified on current and ex-miner status. The overall prevalence of pneumoconiosis was low (2%-4%). The degree of agreement between the two readers for profusion was moderate to high (kappa=0.58). A significant association (Pminers only. A significant (Pminers with pneumoconiosis than among those without. Logistic regression models showed no significant relationships between pneumoconiosis and symptoms. The overall prevalence of pneumoconiosis, although significantly associated with CDE, was low. The presence of pneumoconiosis is associated with meaningful health effects, including deterioration in lung function. Intervention measures that control exposure are indicated, to reduce these functional effects.

Overall requirements for an advanced underground coal extraction system. [environment effects, miner health and safety, production cost, and coal conservation

Science.gov (United States)

Goldsmith, M.; Lavin, M. L.

1980-01-01

Underground mining systems suitable for coal seams expoitable in the year 2000 are examined with particular relevance to the resources of Central Appalachia. Requirements for such systems may be summarized as follows: (1) production cost; (2)miner safety; (3) miner health; (4) environmental impact; and (5) coal conservation. No significant trade offs between production cost and other performance indices were found.

Gastric cancer in coal miners: an hypothesis of coal mine dust causation

Energy Technology Data Exchange (ETDEWEB)

Ong, T M; Whong, W Z; Ames, R G

1983-10-01

An hypothesis is proposed to explain the elevated incidence of gastric cancer among coal miners. Inhaled coal mine dust, especially the larger particles, is cleared from the lung and tracheobronchial tree by mucociliary function, swallowed, and introduced into the stomach. Organic and/or inorganic materials in the dust can undergo intra-gastric nitrosation and/or interaction with exogenous chemicals to form carcinogenic compounds which in turn may lead to precancerous lesions, which may subsequently develop into gastric cancer. This sequence of events, however, depends upon occupational exposures as well as life-style features and individual genetic predisposition.

A Look into Miners' Health in Prevailing Ambience of Underground Coal Mine Environment

Science.gov (United States)

Dey, N. C.; Pal, S.

2012-04-01

Environmental factors such as noise, vibration, illumination, humidity, temperature and air velocity, etc. do play a major role on the health, comfort and efficient performance of underground coal miners at work. Ergonomics can help to promote health, efficiency and well being of miners and to make best use of their capabilities within the ambit of underground coal mine environment. Adequate work stretch and work-rest scheduling have to be determined for every category of miners from work physiology point of view so as to keep better health of the miners in general and to have their maximum efficiency at work in particular.

Combustion characteristics of intensively cleaned coal fractions. Effect of mineral matter

Energy Technology Data Exchange (ETDEWEB)

Rubiera, F.; Arenillas, A.; Fuente, E.; Pis, J.J. [Inst. Nacional de Carbon, Oviedo (Spain); Ivatt, S. [ETSU, Harwell, Didcot (United Kingdom)

1997-12-31

The purpose of this work has been to assess the effect that intensive coal cleaning exerts on the combustion behaviour of different density-separated coal fractions. Samples with ash contents varying from 39% for the raw coal, to 2% for the cleanest fraction were obtained after density separation. Temperature-programmed combustion and isothermal gasification in air were used to measure the reactivities of the parent coal and the cleaned fractions. Coal and char reactivities increased with increasing ash content of the samples. Thermal analysis-mass spectrometry of the low-temperature ashes was also carried out in order to study the reactions of coal minerals under combustion conditions. (orig.)

Development and Validation of a Safety Attitude Scale for Coal Miners in China

Directory of Open Access Journals (Sweden)

Xiang Wu

2017-11-01

Full Text Available Safety attitude is of vital importance to accident prevention, and the high accident rate in the coal mining industry makes it urgent to undertake research on coal miners’ safety attitude. However, the current literature still lacks a valid and reliable safety attitude measurement scale for coal miners, which stands as a barrier against their safety attitude improvement. In this study, a scale is developed that can be used to measure coal miners’ safety attitude. The preliminary scale was based on an extended literature review. Empirical data were then collected from 725 coal miners using the preliminary scale. Both exploratory and confirmatory factor analyses were undertaken to validate and improve the scale. The final scale, which consists of 17 items, contains four dimensions: management safety commitment, team safety climate, fatalism and work pressure. Results show that this safety attitude scale can effectively measure the safety attitude of coal miners, showing high psychological measurement validity. This paper contributes to the occupational safety research by developing the factor structure and indicator system of coal miners’ safety attitude, thus providing more profound interpretation of this crucial construct in the safety research domain. The measurement scale serves as an important tool for safety attitude benchmarking among different coal mining enterprises and, thus, can boost the overall safety improvement of the whole industry. These findings can facilitate improvement of both theories and practices related to occupational safety attitude.

Using X-ray methods to evaluate the combustion sulfur minerals and graphitic carbon in coals and ashes

International Nuclear Information System (INIS)

Wertz, D.L.; Collins, L.W.

1988-01-01

Coals are complex mixtures of vastly different materials whose combustion kinetics may well exhibit symbiotic effects. Although the sulfur oxide gases produced during the combustion of coals may have a variety of sources, they are frequently caused by the thermal degradation of inorganic minerals to produce ''acid rain''. Since many of the minerals involved either as reactants or products in coal combustion produce well defined x-ray power diffraction (XRPD) patterns, the fate of these minerals may be followed by measuring the XRPD patterns of combustion products. Coal 1368P, a coal with an unusually high pyrite (FeS/sub 2/) fraction, has been the subject materials in our investigations of the fate of the inorganic minerals during combustion. These studies include measuring the fate of pyrite and of graphitic carbon in coal 1368P under varying combustion conditions. The results discussed in this paper were obtained by standard XRPD methods

Gallium-67 citrate imaging in underground coal miners

International Nuclear Information System (INIS)

Kanner, R.E.; Barkman, H.W. Jr.; Rom, W.N.; Taylor, A.T. Jr.

1985-01-01

Twenty-two underground coal workers with 27 or more years of coal dust exposure were studied with gallium-67 citrate (Ga-67) imaging. Radiographic evidence of coal workers indicates that pneumoconiosis (CWP) was present in 12 subjects. The Ga-67 scan was abnormal in 11 of 12 with, and 9 of 10 without, CWP. The Ga-67 uptake index was significantly correlated with total dust exposure (p less than 0.01) and approached significant correlation with the radiographic profusion of the nodules (0.10 greater than p greater than 0.05). There was no correlation between Ga-67 uptake and spirometric function, which was normal in this group of patients; furthermore, increased lung uptake of gallium did not indicate a poor prognosis in subjects no longer exposed to coal dust. While coal dust exposure may be associated with positive Ga-67 lung scan in coal miners with many years of coal dust exposure, the scan provided no information not already available from a careful exposure history and a chest radiograph. Since Ga-67 scanning is a relatively expensive procedure the authors would recommend that its use in subjects with asymptomatic CWP be limited to an investigative role and not be made part of a routine evaluation

Injury experience in nonmetallic mineral mining (except stone and coal), 1991

Energy Technology Data Exchange (ETDEWEB)

1993-10-01

This Mine Safety and Health Administration (MSHA) informational report reviews in detail the occupational injury and illness experience of nonmetallic mineral mining (except stone and coal) in the United States for 1991. Data reported by operators of mining establishments concerning work injuries are summarized by work location, accident classification, part of body injured, nature of injury, occupation, and principal type of mineral. Related information on employment, worktime, and operating activity also is presented. Data reported by independent contractors performing certain work at mining locations are depicted separately in this report. For ease of comparison with other metal and nonmetallic mineral mining industries and with coal mining, summary reference tabulations are included at the end of both the operator and the contractor sections of this report.

Frequency of musculoskeleton health problems and its relation with demographic variables among cherat coal miners district nowshera khyber pukhtunkhwa pakistan

International Nuclear Information System (INIS)

Ishtiaq, M.; Zehan, N.

2014-01-01

The objective was to determine the frequency of musculo-skeleton health problems among the coal miners and to assess the relation of musculo-skeleton with various demographic variables among cherat coal miners of District Nowshera Khyber Pukhtunkhwa Pakistan. Materials and Methods: A cross-sectional study design was conducted between July and December 2014 at the cherat coal mines of District Nowshera. A sample size of 400 was selected through cluster sampling technique, in which the study area was divided into four clusters and then from each cluster 40% coal miners were selected based on simple random technique. There are approximately 80-90 Cherat coal mines in which around 1000 of coal miners are working. Coal miner's having more than one year of coal mining job were included in the study while those with less than one year or having any pathological problems were excluded from the study population. Field visits were conducted to collect relevant data from the study areas. The structured pretested questionnaire was used to collect data regarding history of musculo-skeleton problems and was evaluated with the selected demographic variables like age, duration of coal mining job, job satisfaction, and previous history of mine injuries. Results: Our study results showed that approximately 61% of coal miners had history of musculo-skeleton problems. Among those coal miners who gave history of musculo-skeleton problems, 76.64% were due to lack of training, 24.59% to early 1-4 years of coal mining job, 60.23% to less than 30 years of coal miner's age, 75.00% to unsatisfied with job, 83.19% to poor/bad knowledge of mine safety measures; 58.87% for not using personnel protective measures; and 67.62% to positive smoking history while the remaining 32.38 were among non-smokers. Conclusion: The frequency of occupational musculo-skeleton problems among coal miners 61% more and had strong relationship with age, duration of coal mining job, smoking behavior, job satisfaction

Sulphur self–retention and sulphur dioxide capture with active calcium minerals in mineral–rich coals / Mchabe, D.

OpenAIRE

Mchabe, Dursman

2011-01-01

In order to provide information for the development of clean coal technology, the sulphur self–retention and sulphur dioxide capturing properties of minerals present in low grade coals was investigated. This study consisted of detailed mineral analyses of coal and ash samples using results obtained from QEMSCAN and separate retention (coal) and capture (ash) experiments with laboratory scale reactors. Typical South African coal samples were used in this study. The ash content v...

A scanning electron microscope method for automated, quantitative analysis of mineral matter in coal

Energy Technology Data Exchange (ETDEWEB)

Creelman, R.A.; Ward, C.R. [R.A. Creelman and Associates, Epping, NSW (Australia)

1996-07-01

Quantitative mineralogical analysis has been carried out in a series of nine coal samples from Australia, South Africa and China using a newly-developed automated image analysis system coupled to a scanning electron microscopy. The image analysis system (QEM{asterisk}SEM) gathers X-ray spectra and backscattered electron data from a number of points on a conventional grain-mount polished section under the SEM, and interprets the data from each point in mineralogical terms. The cumulative data in each case was integrated to provide a volumetric modal analysis of the species present in the coal samples, expressed as percentages of the respective coals` mineral matter. Comparison was made of the QEM{asterisk}SEM results to data obtained from the same samples using other methods of quantitative mineralogical analysis, namely X-ray diffraction of the low-temperature oxygen-plasma ash and normative calculation from the (high-temperature) ash analysis and carbonate CO{sub 2} data. Good agreement was obtained from all three methods for quartz in the coals, and also for most of the iron-bearing minerals. The correlation between results from the different methods was less strong, however, for individual clay minerals, or for minerals such as calcite, dolomite and phosphate species that made up only relatively small proportions of the mineral matter. The image analysis approach, using the electron microscope for mineralogical studies, has significant potential as a supplement to optical microscopy in quantitative coal characterisation. 36 refs., 3 figs., 4 tabs.

Emphysema and chronic obstructive pulmonary disease in coal miners

Energy Technology Data Exchange (ETDEWEB)

Tomas, L.H.S. [Medical College of Wisconsin, Milwaukee, WI (United States)

2011-03-15

Coal mining remains a major industry that has workers at risk for developing chronic lung disease. Aside from simple coal workers' pneumoconiosis and progressive massive fibrosis, the development of emphysema and obstructive lung disease independent of smoking may be underappreciated. This article reviews more recent studies that may help rectify this faulty view. Cumulative exposure to coal dust is a significant risk factor for the development of emphysema and has an additive effect to smoking. Increased coal dust exposure is associated with increased risk of death from chronic obstructive pulmonary disease (COPD). In newly employed coal miners, bronchitic symptoms are associated with a rapid decline in lung function within 2 years after starting work. In evaluating impairment, the chest radiograph may be helpful as a marker of exposure but the diffusing capacity is most correlated with dyspnea, whereas the emphysema computed tomography score has good association with expiratory flow limitation. Latest studies further support the association of emphysema and COPD with coal dust exposure. Increased cumulative exposure may also increase risk of death from these diseases.

Gamma radiation hazard to miners in bituminous coal mines

International Nuclear Information System (INIS)

Skubacz, K.

1986-01-01

Radiation hazard to miners working in 16 bituminous coal mines was determined by a thermoluminescence method. While the miners exposure to gamma radiation is higher than that of the general population, the yearly dose was never found to exceed 5 mSv in any investigated person. Factors contributing to the estimate of the exposure hazard and the need for individual dose monitoring in mines are discussed in more detail. 3 refs., 4 figs. (author)

Determination of mineral matter distribution in a coal seam using O sub 2 chemisorption technique

Energy Technology Data Exchange (ETDEWEB)

Palmer, A.D.; Goulet, J.-C.; Grandsen, J.; Price, J.T.; Furimsky, E. (CANMET, Ottawa, ON (Canada). Energy Research Laboratories)

1990-08-01

A series of samples taken from different depths of the seam of a bituminous coal in Western Canada was used to determine the mineral matter distribution. The measurements were carried out using the O{sub 2} chemisorption based on a thermogravimetric technique. The O{sub 2} chemisorption increased with decreasing mineral matter content. The employed technique was found to be suitable for identifying the portion of coal seam least contaminated with mineral matter. 5 refs., 3 figs., 1 tab.

75 FR 64411 - Lowering Miners' Exposure to Respirable Coal Mine Dust, Including Continuous Personal Dust Monitors

Science.gov (United States)

2010-10-19

... industries, such as mining, by reducing workplace deaths and improving the health of coal miners. This..., enhanced enforcement, collaborative outreach, and education and training. The initiative will reduce, and... reducing the respirable coal mine dust levels, miners continue to develop black lung. Based on recent data...

Debilitating lung disease among surface coal miners with no underground mining tenure.

Science.gov (United States)

Halldin, Cara N; Reed, William R; Joy, Gerald J; Colinet, Jay F; Rider, James P; Petsonk, Edward L; Abraham, Jerrold L; Wolfe, Anita L; Storey, Eileen; Laney, A Scott

2015-01-01

To characterize exposure histories and respiratory disease among surface coal miners identified with progressive massive fibrosis from a 2010 to 2011 pneumoconiosis survey. Job history, tenure, and radiograph interpretations were verified. Previous radiographs were reviewed when available. Telephone follow-up sought additional work and medical history information. Among eight miners who worked as drill operators or blasters for most of their tenure (median, 35.5 years), two reported poor dust control practices, working in visible dust clouds as recently as 2012. Chest radiographs progressed to progressive massive fibrosis in as few as 11 years. One miner's lung biopsy demonstrated fibrosis and interstitial accumulation of macrophages containing abundant silica, aluminum silicate, and titanium dust particles. Overexposure to respirable silica resulted in progressive massive fibrosis among current surface coal miners with no underground mining tenure. Inadequate dust control during drilling/blasting is likely an important etiologic factor.

Burnout, Depression and Proactive Coping in Underground Coal Miners in Serbia - Pilot Project

Directory of Open Access Journals (Sweden)

Manić Saška

2017-03-01

Full Text Available Mining is unsurprisingly considered a high-risk occupation because it involves continuous hard labour under highly demanding and stressful conditions. Many of these work stressors can impair individuals’ well-being in both a physiological and psychological sense. The aims of this study were to assess the prevalence of burnout and depressive symptoms and to evaluate aspects of proactive coping among underground coal miners in Serbia. The study involved 46 male underground coal miners. Burnout was measured with the Copenhagen Burnout Inventory, depression was assessed with the Patient Health Questionnaire-9, and level of proactive coping was measured with the Proactive Coping Inventory. The results showed a low level of burnout syndrome among the underground coal miners (12.46±4.879. Depression was slightly above the minimum (1.2±2.094, and the majority of the participants had no symptoms of depression (93.5%. Overall, the underground coal miners’ ability to proactively cope with work stress was very good (42.17±6.567. This is in contrast to the findings of the few previous international studies and is a good basis for further research using a larger sample in Serbia.

The three-dimensional shapes of underground coal miners' feet do not match the internal dimensions of their work boots.

Science.gov (United States)

Dobson, Jessica A; Riddiford-Harland, Diane L; Bell, Alison F; Steele, Julie R

2018-04-01

Mining work boots provide an interface between the foot and the ground, protecting and supporting miners' feet during lengthy coal mining shifts. Although underground coal miners report the fit of their work boots as reasonable to good, they frequently rate their boots as uncomfortable, suggesting that there is a mismatch between the shape of their feet and their boots. This study aimed to identify whether dimensions derived from the three-dimensional scans of 208 underground coal miners' feet (age 38.3 ± 9.8 years) differed from the internal dimensions of their work boots. The results revealed underground coal miners wore boots that were substantially longer than their feet, possibly because boots available in their correct length were too narrow. It is recommended boot manufacturers reassess the algorithms used to create boot lasts, focusing on adjusting boot circumference at the instep and heel relative to increases in foot length. Practitioner Summary: Fit and comfort ratings suggest a mismatch between the shape of underground coal miners' feet and their boots exists. This study examined whether three-dimensional scans of 208 miners' feet differed from their boot internal dimensions. Miners wore boots substantially longer than their feet, possibly due to inadequate width.

Pre-Concentration of Vanadium from Stone Coal by Gravity Using Fine Mineral Spiral

Directory of Open Access Journals (Sweden)

Xin Liu

2016-08-01

Full Text Available Due to the low grade of V2O5 in stone coal, the existing vanadium extraction technologies face challenges in terms of large handling capacity, high acid consumption and production cost. The pre-concentration of vanadium from stone coal before the extraction process is an effective method to reduce cost. In this study, detailed mineral characterization of stone coal was investigated. It has been confirmed that the vanadium mainly occurs in muscovite and illite. A significant demand for an effective pre-concentration process with simple manipulation for discarding quartz and other gangue minerals is expected. Based on the mineralogical study, a new vanadium pre-concentration process using a fine mineral spiral was investigated. The experimental results showed that the separation process, which was comprised of a rougher and scavenger, could efficiently discard quartz, pyrite and apatite. A final concentrate with V2O5 grade of 1.02% and recovery of 89.6% could be obtained, with 26.9% of the raw ore being discarded as final tailings.

Osteoarthritis of the knee in coal miners: report by the Industrial Injuries Advisory Council in accordance with Section 171 of the Social Security Administration Act 1992 considering prescription for osteoarthritis of the knee in coal miners

Energy Technology Data Exchange (ETDEWEB)

NONE

2008-08-15

The report considers prescription for osteoarthritis of the knee in miners. Osteoarthritis of the knee, a common disorder in the general population, was last reviewed by the Council in May 1995 in its Command paper 'Disorders of the Knee' (Cm. 2842). This report follows a representation from an ex-Council member highlighting epidemiological evidence of an increased risk of this disorder in miners. The coal mining industry has undergone many changes which have decreased the extent to which miners have been exposed to such employment conditions, notably the closure of many mines by 1986. However, there is evidence that the relevant exposure circumstances will still have occurred after 1986 in certain categories of miner, such as faceworkers working nonmechanised coal faces.It is recommended that osteoarthritis of the knee should be prescribed in relation to work as an underground miner for ten years or more in aggregate; but that to be reckonable, any service from 1986 onwards should be in certain specific categories of coal mining occupation, as set out in the recommended prescription schedule. 2 apps.

Birth and first steps of mineral coal industry in the USA

International Nuclear Information System (INIS)

Martin-Amouroux, Jean-Marie

2015-10-01

The author proposes a brief history of the emergence of a mineral coal industry in the USA. He notices that wood has been the first source of energy used by settlers for housing heating, and then in industry and transports for heat and steam production. As demand and supply conditions were bad, coal production, although mining sites had been quickly identified and used, only emerged from the 1840's. Different kinds of coal (anthracite, bitumen) have been extracted depending on the region. Then, urbanisation and industrialisation created new opportunities for coal, and the share of coal regularly increased. The author describes how the coal industry was organised: seven regions, central position of Pittsburgh. He outlines the tremendous growth of coal production between 1840 and 1913; comments the distribution of this production among the different states. He describes and comments how this production has been industrialised. This industrialisation resulted in a dramatic increase of productivity between 1890 and 1910. He finally evokes the rather late creation of federal bodies

Contributions of dust exposure and cigarette smoking to emphysema severity in coal miners in the United States

Energy Technology Data Exchange (ETDEWEB)

Kuempel, E.D.; Wheeler, M.W.; Smith, R.J.; Vallyathan, V.; Green, F.H.Y. [NIOSH, Cincinnati, OH (United States)

2009-08-15

Previous studies have shown associations between dust exposure or lung burden and emphysema in coal miners, although the separate contributions of various predictors have not been clearly demonstrated. The objective was to quantitatively evaluate the relationship between cumulative exposure to respirable coal mine dust, cigarette smoking, and other factors on emphysema severity. The study group included 722 autopsied coal miners and nonminers in the United States. Data on work history, smoking, race, and age at death were obtained from medical records and questionnaire completed by next-of-kin. Emphysema was classified and graded using a standardized schema. Job-specific mean concentrations of respirable coal mine dust were matched with work histories to estimate cumulative exposure. Relationships between various metrics of dust exposure (including cumulative exposure and lung dust burden) and emphysema severity were investigated in weighted least squares regression models. Emphysema severity was significantly elevated in coal miners compared with nonminers among ever- and never-smokers (P < 0.0001). Cumulative exposure to respirable coal mine dust or coal dust retained in the lungs were significant predictors of emphysema severity (P < 0.0001) after accounting for cigarette smoking, age at death, and race. The contributions of coal mine dust exposure and cigarette smoking were similar in predicting emphysema severity averaged over this cohort. Coal dust exposure, cigarette smoking, age, and race are significant and additive predictors of emphysema severity in this study.

Pathological study of the prevalence of silicosis among coal miners in Iran: A case history

Science.gov (United States)

Zare Naghadehi, Masoud; Sereshki, Farhang; Mohammadi, F.

2014-02-01

One of the most hazardous diseases that is commonly associated with the coal mining industry is Silicosis which caused by dust inhalation. This disease occurs as a result of prolonged breathing of dust containing silica (quartz). The generation of coal mine dust during underground and surface coal mining is the most significant source of coal dust exposure. Silica dust develops scar tissue inside the lungs which reduces the lungs ability to extract oxygen from the air. All miners working in underground and surface coal mines are at risk of being exposed to mine dust containing silica. In this study, cases with pathologic diagnosis of silicosis during seven years period between 2000 and 2007 were retrieved, from the pathologic file of Department of Pathology, Massih Daneshvary Hospital in Iran. Results of this case study showed the great effects of dust exposure and inhalation from the viewpoint of symptoms especially between the miners.

Mineral coal. Reactivation of the consumption inside the country

International Nuclear Information System (INIS)

Unidad de Planeacion Minero Energetica, UPME

2000-01-01

Contrary of the Atlantic coast coal, that for their geographical location and for the size of the exploitation, they are dedicated to the international markets, the coal of the interior of the country that in general are exploited in handmade form and in small scale, they are dedicated to the domestic, given market the lack of infrastructure of transport to locate them at competitive costs in the ports. The coal of the interior are, however, an input of non-worthless importance in the electric power generation and in the cement production, brick and paper. The exploitation of the mineral also exercises its influence in the economic development of the regions producers. The study of the situation and perspectives of the sector are, this way, fundamental for the orientation and design of the strategies for their invigoration. This article examines to big features the problems associated with the loss of dynamism of the consumption of coal in the departments of the interior of Colombia and it presents some alternatives to confront the difficulties of the sector, in this region of the country

Environmental procedures for thermoelectric power plants by national mineral coal

International Nuclear Information System (INIS)

Serra, M.T.F.; Verney Gothe, C.A. de; Silva Ramos, R. da

1990-01-01

This paper presents the environmental impacts decursive of utilization of South-Brazilian mineral coal to generation of electric energy. This environmental impacts and alternatives of attenuating measures are presented and evaluated, containing the totality of productive cycle: mining, processing, transport, stock piling and use in thermoelectric power plants. Environmental procedures are systematized for first time, in order to be observed in whole expansion of coal thermoelectric generator park. The conception of power plants and site studies of their useful lives are also included. (C.M.). 19 figs, 24 tabs

Behavior of catalyst and mineral matter in coal liquefaction; Sekitan ekika hannochu no kobusshitsu to shokubai no kyodo

Energy Technology Data Exchange (ETDEWEB)

Iwasaki, K.; Wang, J.; Tomita, A. [Tohoku University, Sendai (Japan). Institute for Chemical Reaction Science

1996-10-28

Mineral matter in coals is important in various senses for coal liquefaction. It is possible that the catalytic activity is affected by the interaction between catalyst and mineral matter. Iron-based catalyst forms pyrrhotite in the process of liquefaction, but the interaction between it and mineral matter is not known in detail. In this study, the interaction between mineral matter and catalyst and the selective reaction between them were investigated. Tanito Harum coal was used for this study. This coal contains a slight amount of siderite and jarosite besides pyrite as iron compounds. Liquefaction samples were obtained from the 1 t/d NEDOL process PSU. The solid deposits in the reactor mainly contained pyrrhotite and quartz. A slight amount of kaolinite was observed, and pyrite was little remained. It was found that the catalyst (pyrrhotite) often coexisted with quartz, clay and calcite. 8 figs., 2 tabs.

Bioprocessing of coal - 10 - an application of microbial flotation to mineral processing

Energy Technology Data Exchange (ETDEWEB)

Nagaoka, T. [and others] [CRIEPI, Abiko-shi (Japan). Abiko Research Lab.

1996-09-01

Microbial flotation for coal desulfurization is being developed. Pyrite in coal is removed by bacterial adhesion by changing the surface property of pyrite. The bacterial adhesion of Thiobacillus ferrooxidans to sulfide minerals (pyrite, galena, molybdenite, chalcocite and millerite), and pyrite removal from the mixture of these sulfide minerals by microbial flotation was investigated. To compare the adhesion of T. ferrooxidans to pyrite with that to the other four minerals mentioned, the surface areas of the minerals, where the bacterium could adhere, was measured. It was observed that the roughness on the mineral surfaces was much smaller than the size of the bacterial cells. Hence, it was suggested that the roughness did not affect the bacterial adhesion to mineral surfaces. Bacterial adhesion to pyrite was compared with that to the other minerals. The amount of adhering bacterium was estimated on the basis of the adherable surface area measured with microscopic method. The amount of adhering cells to pyrite was 421.6 x 10{sup 8} cells/cm{sup 2}. On the other hand, the amounts of adhering cells to the minerals, except for pyrite were in a range of 77.1 to 160.8 x 10{sup 8} cells/cm{sup 2}. The bacterium adheres more to pyrite than to the other minerals, and only adheres to pyrite even if the pyrite is mixed with other minerals. Hence, T. ferrooxidans could adhere selectively to pyrite. Pyrite removal from the mineral mixtures was investigated with microbial flotation. Pyrite removal was in a range of 83.7% to 95.1% and mineral recovery was 72.9% to 100%. The grade of recovered minerals was in a range of 79.2 to 86.0% and that of rejected pyrite was in a range of 78.7 to 90.0%. These results suggest that microbial flotation can be a novel technology for mineral processing.

Minerals in the Ash and Slag from Oxygen-Enriched Underground Coal Gasification

Directory of Open Access Journals (Sweden)

Shuqin Liu

2016-03-01

Full Text Available Underground coal gasification (UCG is a promising option for the recovery of low-rank and inaccessible coal resources. Detailed mineralogical information is essential to understand underground reaction conditions far from the surface and optimize the operation parameters during the UCG process. It is also significant in identifying the environmental effects of UCG residue. In this paper, with regard to the underground gasification of lignite, UCG slag was prepared through simulation tests of oxygen-enriched gasification under different atmospheric conditions, and the minerals were identified by X-Ray diffraction (XRD and a scanning electron microscope coupled to an energy-dispersive spectrometer (SEM-EDS. Thermodynamic calculations performed using FactSage 6.4 were used to help to understand the transformation of minerals. The results indicate that an increased oxygen concentration is beneficial to the reformation of mineral crystal after ash fusion and the resulting crystal structures of minerals also tend to be more orderly. The dominant minerals in 60%-O2 and 80%-O2 UCG slag include anorthite, pyroxene, and gehlenite, while amorphous substances almost disappear. In addition, with increasing oxygen content, mullite might react with the calcium oxide existed in the slag to generate anorthite, which could then serve as a calcium source for the formation of gehlenite. In 80%-O2 UCG slag, the iron-bearing mineral is transformed from sekaninaite to pyroxene.

Impact of organic-mineral matter interactions on thermal reaction pathways for coal model compounds

Energy Technology Data Exchange (ETDEWEB)

Buchanan, A.C. III; Britt, P.F.; Struss, J.A. [Oak Ridge National Lab., TN (United States). Chemical and Analytical Sciences Div.

1995-07-01

Coal is a complex, heterogeneous solid that includes interdispersed mineral matter. However, knowledge of organic-mineral matter interactions is embryonic, and the impact of these interactions on coal pyrolysis and liquefaction is incomplete. Clay minerals, for example, are known to be effective catalysts for organic reactions. Furthermore, clays such as montmorillonite have been proposed to be key catalysts in the thermal alteration of lignin into vitrinite during the coalification process. Recent studies by Hatcher and coworkers on the evolution of coalified woods using microscopy and NMR have led them to propose selective, acid-catalyzed, solid state reaction chemistry to account for retained structural integrity in the wood. However, the chemical feasibility of such reactions in relevant solids is difficult to demonstrate. The authors have begun a model compound study to gain a better molecular level understanding of the effects in the solid state of organic-mineral matter interactions relevant to both coal formation and processing. To satisfy the need for model compounds that remain nonvolatile solids at temperatures ranging to 450 C, model compounds are employed that are chemically bound to the surface of a fumed silica (Si-O-C{sub aryl}linkage). The organic structures currently under investigation are phenethyl phenyl ether (C{sub 6}H{sub 5}CH{sub 2}CH{sub 2}OC{sub 6}H{sub 5}) derivatives, which serve as models for {beta}-alkyl aryl ether units that are present in lignin and lignitic coals. The solid-state chemistry of these materials at 200--450 C in the presence of interdispersed acid catalysts such as small particle size silica-aluminas and montmorillonite clay will be reported. Initial focus will be on defining the potential impact of these interactions on coal pyrolysis and liquefaction.

Explanatory models of black lung: understanding the health-related behavior of Appalachian coal miners.

Science.gov (United States)

Friedl, J

1982-03-01

Many retired coal miners who are eligible for care in a black lung treatment center at little or no cost to themselves do not enter into available programs or discontinue soon after beginning therapy. Reasons for this behavior are related to the prevalent beliefs among Appalachians concerning the course of black lung and the appropriate treatment for it. The miners' health beliefs are clearly at odds with those of the health care providers who work in the centers. Using the concept of explanatory model, popular and professional health cultures are analyzed, focusing on course of disease, sick role, appropriate treatment, and expected outcome. Differences in explanatory models are discussed with regard to implications for the organization and delivery of care to retired coal miners with black lung.

Nuclear techniques for in situ evaluation of coal and mineral deposits

International Nuclear Information System (INIS)

Borsaru, M.

1993-01-01

This paper reviews developments in in situ analysis of minerals and coal by nuclear borehole logging. Developments in the oil, gas and uranium industries are not discussed in the present paper unless they have direct applications in the mineral industry (e.g. multi-element analysis and development of spectral litho-density tools). The review covers techniques developed mostly in the last decade and is based on work published in North America, Europe and Australia. (author)

Estimation of respirable dust exposure among coal miners in South Africa.

Science.gov (United States)

Naidoo, Rajen; Seixas, Noah; Robins, Thomas

2006-06-01

The use of retrospective occupational hygiene data for epidemiologic studies is useful in determining exposure-outcome relationships, but the potential for exposure misclassification is high. Although dust sampling in the South African coal industry has been a legal requirement for several decades, these historical data are not readily adequate for estimating past exposures. This study describes the respirable coal mine dust levels in three South African coal mines over time. Each of the participating mining operations had well-documented dust sampling information that was used to describe historical trends in dust exposure. Investigator-collected personal dust samples were taken using standardized techniques from the face, backbye (underground jobs not at the coal face), and surface from 50 miners at each mine, repeated over three sampling cycles. Job histories and exposure information was obtained from a sample of 684 current miners and 188 ex-miners. Linear models were developed to estimate the exposure levels associated with work in each mine, exposure zone, and over time using a combination of operator-collected historical data and investigator-collected samples. The estimated levels were then combined with work history information to calculate cumulative exposure metrics for the miner cohort. The mean historical and investigator-collected respirable dust levels were within international norms and South African standards. Silica content of the dust samples was also below the 5% regulatory action level. Mean respirable dust concentrations at the face, based on investigator-collected samples, were 0.9 mg/m(3), 1.3 mg/m(3), and 1.9 mg/m(3) at Mines 1, 2, and 3, respectively. The operator-collected samples showed considerable variability across exposure zones, mines, and time, with the annual means at the face ranging from 0.4 mg/m(3) to 2.9 mg/m(3). Statistically significant findings were found between operator- and investigator-collected dust samples. Model

Acidic surface functional groups and mineral elements in Lakra coal (Sindh, Pakistan)

International Nuclear Information System (INIS)

Saeed, K.; Ishaq, M.; Ahjmad, I.; Shakirullah, M.; Haider, S.

2010-01-01

Surface acidity of virgin coal (Lakra Sindh, Pakistan) and variously extracted/leached coal samples with HNO/sub 3/ NaOH, and KMnO/sub 4/, were investigated by aqueous potentiometric titration employing KOH as a titrant. The titration curve of virgin coal showed that its surface might contain carboxylic, carbonyl, phenolic and other weak acidic functional groups such as enols and C-H bond. The titration curves of leached coal samples showed inflections at pH 4-11, being not similar the inflections of carboxylic groups. This inflection might be given by functional groups like CO/sub 2/, phenolic, enols and C-H. Mineral matter such as Fe, K, Zn, Mn and Ni were determined in the ash of coal by atomic absorption spectrophotometer and was found that Fe (3104 micro g/g) in the highest and Ni (36.05 micro g/g) in the lowest quantity is present in virgin coal sample. (author)

Book review: Economic geology: Principles and practice: Metals, minerals, coal and hydrocarbons—Introduction to formation and sustainable exploitation of mineral deposits

Science.gov (United States)

Anderson, Eric

2013-01-01

This volume, available in both hardcover and paperback, is an English translation of the fifth edition of the German language text Mineralische und Energie-Rohstoffe. The book provides an extensive overview of natural resources and societal issues associated with extracting raw materials. The comprehensive list of raw materials discussed includes metals, industrial minerals, coal, and hydrocarbons. The book is divided into four parts: (1) “Metalliferous ore deposits,” (2) “Nonmetallic minerals and rocks,” (3) “Practice of economic geology,” and (4) “Fossil energy raw materials—coal, oil, and gas.” These sections are bound by a brief introduction and an extensive list of up-to-date references as well as an index. Each chapter begins with a concise synopsis and concludes with a summary that contains useful suggestions for additional reading. All figures are grayscale images and line drawings; however, several have been grouped together and reproduced as color plates. Also included is a companion website (www.wiley.com/go/pohl/geology) that contains additional resources, such as digital copies of figures, tables, and an expanded index, all available for download in easy-to-use formats.Economic Geology: Principles and Practice: Metals, Minerals, Coal and Hydrocarbons—Introduction to Formation and Sustainable Exploitation of Mineral Deposits. Walter l. Pohl. 2011. Wiley-Blackwell. Pp. 663. ISBN 978-1-4443-3663-4 (paperback).

Prevalence of major obstructive sleep apnea syndrome symptoms in coal miners and healthy adults.

Science.gov (United States)

Kart, Levent; Dutkun, Yalçın; Altın, Remzi; Ornek, Tacettin; Kıran, Sibel

2010-01-01

Obstructive sleep apnea syndrome obstructive sleep apnea syndrome is associated with symptoms including habitual snoring, witness apnea and excessive daytime sleepiness. Also obstructive sleep apnea syndrome is related to some occupations which are needed attention for work accident. We aimed to determine the prevalence of snoring, witnessed apnea and excessive daytime sleepiness in coal workers and healthy adults in Zonguldak city center, and also evaluate the differences between these groups. This study consisted of 423 underground coal workers and 355 individuals living in centre of Zonguldak. Study and comparison group were chosen by nonstratified randomized sampling method. Data were collected by a questionnaire that included information regarding snoring, witnessed apnea and excessive daytime sleepiness. Mean age was 43.3 ± 6.05 years in miners and 44.3 ± 11.8 years in comparison group. In miners, snoring frequency was determined as 42.6%, witnessed apneas were 4.0%, and daytime sleepiness were 4.7%. In comparison group, these symptoms were 38.6%, 4.8% and 2.8% respectively. There were no statistical differences between coal workers and comparison group in these symptoms. Also snoring prevalence was higher in smoker miners. We found that major symptoms of obstructive sleep apnea syndrome in coal workers are similar to general population in Zonguldak. Further studies that constucted higher populations and with polysomnography are needed to evaluate these findings.

The estimation of the number of underground coal miners and normalization collective dose at present in China

International Nuclear Information System (INIS)

Liu, Fu-dong; Chen, Lu; Pan, Zi-qiang; Liu, Sen-lin; Chen, Ling; Wang, Chun-hong

2017-01-01

Due to the improvement of production technology and the adjustment of energy structure, as well as the town-ownership and private-ownership coal mines (TPCM) were closed or merged by national policy, the number of underground miner has changed comparing with 2004 in China, so collective dose and normalization collective dose in different type of coal mine should be changed at the same time. In this paper, according to radiation exposure by different ventilation condition and the annual output, the coal mines in China are divided into three types, which are named as national key coal mines (NKCM), station-owned local coal mines (SLCM) and TPCM. The number of underground coal miner, collective dose and normalization collective dose are estimated at present base on surveying annual output and production efficiency of raw coal in 2005-2014. The typical total value of the underground coal miners recommended in China is 5.1 million in 2005-2009, and in which there are respectively included 1 million, 0.9 million and 3.2 million for NKCM, SLCM and TPCM. There are total of 4.7 million underground coal miner in 2010-2014, and the respectively number for NKCM, SLCM and TPCM are 1.4 million, 1.2 million and 2.1 million. The collective dose in 2005-2009 is 11 335 man.Sv.y"-"1, and in which there are respectively included 280, 495 and 10 560 man.Sv.y"-"1 for NKCM, SLCM and TPCM. As far as 2010-2014, there are total of 7982 man.Sv.y"-"1, and 392, 660 and 6930 man.Sv.y"-"1 for each type of coal mines. Therefore, the main contributor of collective dose is from TPCM. The normalization collective dose in 2005-2009 is 0.0025, 0.015 and 0.117 man.Sv per 10 kt for NKCM, SLCM and TPCM, respectively. As far as 2010-2014, there are 0.0018, 0.010 and 0.107 man.Sv per 10 kt for each type of coal mines. The trend of normalization collective dose is decreased year by year. (authors)

A kinetic study of gaseous potassium capture by coal minerals in a high temperature fixed-bed reactor

DEFF Research Database (Denmark)

Zheng, Yuanjing; Jensen, Peter Arendt; Jensen, Anker Degn

2008-01-01

The reactions between gaseous potassium chloride and coal minerals were investigated in a lab-scale high temperature fixed-bed reactor using single sorbent pellets. The applied coal minerals included kaolin, mullite, silica, alumina, bituminous coal ash, and lignite coal ash that were formed...... into long cylindrical pellets. Kaolin and bituminous coal ash that both have significant amounts of Si and Al show superior potassium capture characteristics. Experimental results show that capture of potassium by kaolin is independent of the gas oxygen content. Kaolin releases water and forms metakaolin...... when heated at temperatures above 450°C. The amounts of potassium captured by metakaolin pellet decreases with increasing reaction temperature in the range of 900-1300°C and increases again with further increasing the temperature up to 1500°C. There is no reaction of pre-made mullite with KCl...

Linking Compensation and Health Surveillance Data Sets to Improve Knowledge of US Coal Miners' Health.

Science.gov (United States)

Almberg, Kirsten S; Cohen, Robert A; Blackley, David J; Laney, Anthony S; Storey, Eileen; Halldin, Cara N

2017-10-01

Increase knowledge of US coal miners' respiratory health by linking data from the black lung benefits program (BLBP) and the coal workers' health surveillance program (CWHSP). BLBP claims data from 2000 through 2013 was linked to CWHSP data from 1970 through 2016. Overall, 273,644 miners participated in CWHSP, 37,548 in BLBP, and 22,903 in both programs. Median age of miners at their time of first/only participation in CWHSP was 28 and 32 years, respectively. BLBP claimants were older (median age 59). Thirty-nine percent of BLBP claimants had not participated in CWHSP. The relative contributions of states to participation differed between CWHSP and BLBP. For example, Kentucky miners accounted for 18% of CWHSP participants, but 36% of BLPB participants. Many BLBP claimants never appeared in CWHSP, indicating missed opportunities for secondary prevention.

Absenteeism due to sickness in coal miners

Energy Technology Data Exchange (ETDEWEB)

Szymczykiewicz, K.

1980-01-01

During two consecutive years sickness absence of 8005 miners from two pit coal mines (A and B) of different geological structure and mechanization degree was analysed. It was found that in mine ''A'' 37% had no sick leaves, whereas in mine ''B''--28%. Absence rate was similar in both mines (though the miners' work and living conditions differed), i.e. 5.21% in mine ''A'', and 5.98% in mine ''B''. Thus work and living conditions do not determine general sickness absence rate. The highest absence in both mines was that of miners frequently falling ill for a long time (approx. 5.5% miners). For the group the number of work disablement days was 28.8 and 26.7, respectively. Underground miners' sickness absence was higher than that of surface workers, the rate being 3.8 and 4.0 and 1.1 and 2.1, respectively. The highest absence was that of miners travelling to work on motor cycles (7.1 and 7.3) and bicycles (6.4 and 6.7). Those working regularly in the first shift were more frequently absent from work than those working in different shifts. Miners living in worse conditions had higher absence rate than those living in flats of a higher standard. Also elderly employees and those having children represented a higher absence rate. The highest absence rate was that of workers having four children, the lowest--that of single persons. In addition, specific absence rate of men, especially due to respiratory and circulatory system diseases, was found to be enhanced by smoking. Absence rate of smokers was 2--3 times higher than that of non-smokers.

Technological roadmap for production, clean and efficient use of Brazilian mineral coal: 2012 to 2035; Roadmap tecnologico para producao, uso limpo e eficiente do carvao mineral nacional: 2012 a 2035

Energy Technology Data Exchange (ETDEWEB)

NONE

2012-07-01

Brazil has one of the largest coal reserves in the world, but it is not among the largest producers in the world. Coal in Brazil, has two main applications: use as fuel for power generation, including industrial energy use, and in the iron and steel industry for production of coke, pig iron and steel. In the updated rates of use, the coal reserves can provide coal for more than 500 years. A public policy to better take advantage of the mineral coal, with horizons in 2022 and 2035 and the guidelines and strategies proposed for the country to reach the production, clean and efficient use of the expressive quantity of the mineral national coal are presented.

The properties of the nano-minerals and hazardous elements: Potential environmental impacts of Brazilian coal waste fire.

Science.gov (United States)

Civeira, Matheus S; Pinheiro, Rafael N; Gredilla, Ainara; de Vallejuelo, Silvia Fdez Ortiz; Oliveira, Marcos L S; Ramos, Claudete G; Taffarel, Silvio R; Kautzmann, Rubens M; Madariaga, Juan Manuel; Silva, Luis F O

2016-02-15

Brazilian coal area (South Brazil) impacted the environment by means of a large number of coal waste piles emplaced over the old mine sites and the adjacent areas of the Criciúma, Urussanga, and Siderópolis cities. The area studied here was abandoned and after almost 30 years (smokeless visual) some companies use the actual minerals derived from burning coal cleaning rejects (BCCRs) complied in the mentioned area for industry tiles or refractory bricks. Mineralogical and geochemical similarities between the BCCRs and non-anthropogenic geological environments are outlined here. Although no visible flames were observed, this study revealed that auto-combustion existed in the studied area for many years. The presence of amorphous phases, mullite, hematite and other Fe-minerals formed by high temperature was found. There is also pyrite, Fe-sulphates (eg. jarosite) and unburnt coal present, which are useful for comparison purposes. Bad disposal of coal-dump wastes represents significant environmental concerns due to their potential influence on atmosphere, river sediments, soils and as well as on the surface and groundwater in the surroundings of these areas. The present study using advanced analytical techniques were performed to provide an improved understanding of the complex processes related with sulphide-rich coal waste oxidation, spontaneous combustion and mineral formation. It is reporting huge numbers of rare minerals with alunite, montmorillonite, szomolnokite, halotrichite, coquimbite and copiapite at the BCCRs. The data showed the presence of abundant amorphous Si-Al-Fe-Ti as (oxy-)hydroxides and Fe-hydro/oxides with goethite and hematite with various degrees of crystallinity, containing hazardous elements, such as Cu, Cr, Hf, Hg, Mo, Ni, Se, Pb, Th, U, Zr, and others. By Principal Component Analysis (PCA), the mineralogical composition was related with the range of elemental concentration of each sample. Most of the nano-minerals and ultra-fine particles

Miners' lung: a history of dust disease in British coal mining

Energy Technology Data Exchange (ETDEWEB)

Arthur McIvor; Ronald Johnston

2007-02-15

The authors explore the experience of coal miners' lung diseases and the attempts at voluntary and legal control of dusty conditions in British mining from the late nineteenth century to the present. In this way, the book addresses the important issues of occupational health and safety within the mining industry. The authors examine the prevalent diseases, notably pneumoconiosis, emphysema and bronchitis, and evaluate the roles of key players such as the doctors, management and employers, the state and the trade unions. Contents are: General editor's preface; Introduction. Part 1 Interpretations and Context: Methodology and historiography; Work and the body in coalmining. Part 2 Advancing Medical Knowledge on Dust Disease: Coal workers' pneumoconiosis: discovery and denial; Social medicine and pioneering epidemiology; The last gasp: bronchitis and emphysema. Part 3 The Industrial Politics of Miners' Lung: 'Enlightened management'? The NCB, the state and dust; The trade unions and dust. Part 4 Miners' Testimonies: Dust and Disability Narratives: Workplace culture: risk and masculinity; Breathless men: living and dying with dust disease. Conclusion. 3 figs., 10 tabs., 1 app.

77 FR 1359 - Specifications for Medical Examinations of Underground Coal Miners

Science.gov (United States)

2012-01-09

... ionizing radiation associated with the radiograph. Proposed Sec. 37.42(h) would require the use of... potential for higher ionizing radiation exposures using digital radiography systems, we have included... resulted in no coal miners employed by a non-compliant operator participating in the Program. NIOSH is...

Meanings of sex, concepts of risk and sexual practices among migrant coal miners in Quang Ninh, Vietnam.

Science.gov (United States)

Van Tuan, Ta

2010-08-01

The study explores the meanings of sex among migrant coal miners in Vietnam and identifies contextual factors influencing engagement in unsafe sexual practices. Findings reveal that sex carries a number of social meanings in the lives of migrant miners: sex is relaxation and reward for their risk and hard work; access to sex is an incentive for miners to continue working in the mine; sex strengthens identity and social networks; sex helps miners to affirm manhood, group membership and masculinity; and sex workers are confidants with whom they can share their problems. Facing accidents at work on a daily basis, miners are less inclined to worry about the long-term risks of HIV infection. In addition, being excluded from access to relevant information, miners feel distant from HIV infection. Findings suggest that interventions on sexual behaviour and practices should be sensitive to the concepts of risk and meanings of sex among migrant groups such as coal miners.

Study on the correlation between chemical and mineral composition of coal ashes; Sekitanbaibun no kobutsu soseigakuteki kento kagakubutsu sosei to kobutsugakuteki sosei no sokan

Energy Technology Data Exchange (ETDEWEB)

Hirato, M.; Nagashima, S.; Okada, S. [Hachinohe Institute of Technology, Aomori (Japan)

1996-10-28

Coal ash is a substance that has been mixed into minerals in the earth`s crust during their coalification process. Estimation was made on what kinds of mineral composition have been mixed into coals. Noted first was the kinds of compounds contained in the ash, wherein the ratios of mass in the compounds and minerals were correlated, and selection was made on minerals which are thought correlated. The selection criterion was based on minerals containing silica, alumina, iron oxide, lime and magnesium as compounds. Then, a phase equilibrium line diagram was used to estimate compositions and melting points of minerals which are thought to have been produced from these compounds. By comparing the estimation with the measured melting points of the ashes, mineral compositions thought reasonable were all selected. Assumption was possible on minerals that are thought to have been transferred into coal ash. Compound indications of ashes from 29 kinds of the world`s typical coals were replaced with the subject minerals and expressed as mineral compositions. As a method of calculation, stoichiometric coefficients for each mineral were determined by taking material balance in atomic/molecular levels in masses of compound aggregates and mineral composition aggregates. 7 tabs.

Cross sectional and longitudinal study on selenium, glutathione peroxidase, smoking, and occupational exposure in coal miners

Energy Technology Data Exchange (ETDEWEB)

Nadif, R.; Oryszczyn, M.P.; Fradier-Dusch, M.; Hellier, G.; Bertrand, J.P.; Pham, Q.T.; Kauffmann, F. [INSERM, Vandoeuvre-les-Nancy (France). Faculty of Medicine

2001-04-01

The aim of the study was to understand the variations of selenium (Se) concentration relative to changes in occupational exposure to coal dust, taking into account age and changes in smoking habits in miners surveyed twice, in 1990 and 1994. It was found that selenium concentration and glutathione peroxidase activities (GSH-Px) activities were significantly lower in active than in retired miners. Moreover, Se concentration was lower in miners exposed to high compared with those exposed to low dust concentrations. In miners exposed to high dust concentrations, Se concentration was significantly lower whereas erythrocyte GSH-Px activity was significantly higher in the subgroup with estimated cumulative exposure {gt} 68 mg/m{sup 3}.y. In all miners, plasma GSH-Px activity was correlated with Se concentration. The 4 year Se changes were negatively related to exposure to high dust concentrations and positively related to change in exposure from high to retirement and to change from smoker to ex-smoker. The variations of Se concentration in relation to changes in occupational exposure to coal dust and in smoking habits, and the close correlation found between plasma Se concentration and GSH-Px activity suggest that both are required in antioxidant defence. These results agree well with the hypothesis that the decrease in Se concentration reflects its use against reactive oxygen species generated by exposure to coal mine dust and by smoking.

[Changes in the interleukin-6 and interleukin-10 concentrations in the blood plasma of miners working in deep coal mines].

Science.gov (United States)

Plotkin, V Ia; Rebrov, B A; Belkina, E B

2000-03-01

Blood plasma levels of interleukin-6 (IL-6) and interleukin-10 (IL-10) were measured in 45 miners working in a deep coal mine immediately after work shift using an immunoenzyme technique. The highest IL-6 level was recorded in those miners engaged in hard work under most adverse conditions of underground workings--it was found to exceed the control values. The same group of workers demonstrated the lowest level of IL-10 that differed from the control value. Miners aged between 41 to 50 years working in a coal mine, their underground service duration 16 to 20 years, displayed a decline in the level of IL-6. The coal mine miners with the 11- to 15-year service duration revealed an increase in the level of IL-10.

Recent developments in nucleonic control systems and on-stream analysers for the mineral and coal industries

International Nuclear Information System (INIS)

Mathew, P.J.

1994-01-01

Some recent developments in industrial nuclear gauging in Australia are briefly reviewed. Quality control, process control and automation in the mineral and coal industries are based on measurements of the composition and flows of critical process stream. Australia's vast mineral wealth and its importance to the national economy has resulted in CSIRO (Commonwealth Scientific and Industrial Research Organisation) successfully developing and commercializing a variety of nucleonic gauges to meet the needs of the mineral and coal industries. These include gauges for on-line determination of the ash content of coal on conveyor belts, the ash content of solids of weight fraction of coal in slurries, on-stream determination of iron, alumina and manganese in iron ore, bulk analysis of raw feed limestone in the cement industry, and gauges for the measurement of level, moisture, and interfaces. A variety of gauges based on natural radioactivity have also been developed. Instruments based on natural gamma radiation are relatively inexpensive, and free of artificial radiation sources. An on-stream analyser based on natural gamma ray activity has been developed for monitoring the soil content of sugar cane. Significant benefits accrued to industry in using nucleonic gauges are briefly discussed. (author). 18 refs., 8 figs

Predicted mineral melt formation by BCURA Coal Sample Bank coals: Variation with atmosphere and comparison with reported ash fusion test data

Energy Technology Data Exchange (ETDEWEB)

D. Thompson [University of Sheffield (United Kingdom). Department of Engineering Materials

2010-08-15

The thermodynamic equilibrium phases formed under ash fusion test and excess air combustion conditions by 30 coals of the BCURA Coal Sample Bank have been predicted from 1100 to 2000 K using the MTDATA computational suite and the MTOX database for silicate melts and associated phases. Predicted speciation and degree of melting varied widely from coal to coal. Melting under an ash fusion test atmosphere of CO{sub 2}:H{sub 2} 1:1 was essentially the same as under excess air combustion conditions for some coals, and markedly different for others. For those ashes which flowed below the fusion test maximum temperature of 1773 K flow coincided with 75-100% melting in most cases. Flow at low predicted melt formation (46%) for one coal cannot be attributed to any one cause. The difference between predicted fusion behaviours under excess air and fusion test atmospheres becomes greater with decreasing silica and alumina, and increasing iron, calcium and alkali metal content in the coal mineral. 22 refs., 7 figs., 3 tabs.

Environmental procedures for thermoelectric power plants by national mineral coal; Diretrizes ambientais para usinas termeletricas a carvao mineral nacional

Energy Technology Data Exchange (ETDEWEB)

Serra, M T.F.; Verney Gothe, C.A. de; Silva Ramos, R da

1990-01-01

This paper presents the environmental impacts decursive of utilization of South-Brazilian mineral coal to generation of electric energy. This environmental impacts and alternatives of attenuating measures are presented and evaluated, containing the totality of productive cycle: mining, processing, transport, stock piling and use in thermoelectric power plants. Environmental procedures are systematized for first time, in order to be observed in whole expansion of coal thermoelectric generator park. The conception of power plants and site studies of their useful lives are also included. (C.M.). 19 figs, 24 tabs.

Using the extended parallel process model to prevent noise-induced hearing loss among coal miners in Appalachia

Energy Technology Data Exchange (ETDEWEB)

Murray-Johnson, L.; Witte, K.; Patel, D.; Orrego, V.; Zuckerman, C.; Maxfield, A.M.; Thimons, E.D. [Ohio State University, Columbus, OH (US)

2004-12-15

Occupational noise-induced hearing loss is the second most self-reported occupational illness or injury in the United States. Among coal miners, more than 90% of the population reports a hearing deficit by age 55. In this formative evaluation, focus groups were conducted with coal miners in Appalachia to ascertain whether miners perceive hearing loss as a major health risk and if so, what would motivate the consistent wearing of hearing protection devices (HPDs). The theoretical framework of the Extended Parallel Process Model was used to identify the miners' knowledge, attitudes, beliefs, and current behaviors regarding hearing protection. Focus group participants had strong perceived severity and varying levels of perceived susceptibility to hearing loss. Various barriers significantly reduced the self-efficacy and the response efficacy of using hearing protection.

Increasing Severity of Pneumoconiosis Among Younger Former US Coal Miners Working Exclusively Under Modern Dust-Control Regulations.

Science.gov (United States)

Graber, Judith M; Harris, Gerald; Almberg, Kirsten S; Rose, Cecile S; Petsonk, Edward L; Cohen, Robert A

2017-06-01

Coal workers' pneumoconiosis (CWP) steadily declined among US miners following dust control regulations in 1970. In 2000, severe forms of this disease reemerged among young miners, and are well described among working-but not former-miners. Black lung benefits program (BLBP) data (2001 to 2013) were used to estimate respiratory disease burden among former miners including: (1) CWP (simple; advanced CWP, and progressive massive fibrosis [CWP/PMF]); and (2) respiratory impairment (FEV1 percent reference: mild, moderate, ≥moderately-severe). Among 24,686 claimants, 8.5% had advanced CWP/PMF; prevalence was highest among younger (less than or equal to 56 years: 10.8%) and older (greater than 70 years: 8.4%) miners and those who began work after versus before 1970 (8.3% vs. 4.0%). BLBP claims provide potentially useful data for monitoring the burden and severity of coal mine dust lung disease, and assessing efficacy of protective regulations.

Mineral catalysis of oil producing reactions in coal liquefaction

Energy Technology Data Exchange (ETDEWEB)

Shridharani, K.G.

1983-01-01

This work was concerned primarily with the development of a relatively inexpensive, readily available, high activity catalyst that can be used as a disposable catalyst in coal liquefaction processes. For a fair evaluation of the developmental mineral catalyst (presulfided iron oxide), it was necessary to determine at different stages of this work, whether catalyst inhibition, deactivation or activity was the limiting factor in coal liquefaction catalysis. First, different routes were explored to prepare a high hydrogenation activity, iron-based catalyst. Naphthalene hydrogenation was used as a model reaction to rate the hydrogenation activities of different additives. Presulfiding of iron oxide with H/sub 2/S, under controlled conditions, rendered the highest hydrogenation activity mineral catalyst, which had a hydrogenation activity even greater than that of commercial CoMo/Al/sub 2/O/sub 3/ catalyst sulfided with creosote oil and hydrogen. Sulfiding of CoMo/Al/sub 2/O/sub 3/ catalyst with H/sub 2/S remarkably improved its initial hydrogenation activity. Second, the catalyst inhibition and deactivation during liquefaction were studied. Liquefaction-process solvents contain a number of compounds that can either deactivate or inhibit the hydrogenation activity of a catalyst. Finally, the hydrocracking activity of the presulfided iron oxide catalyst was compared with that of commercial catalysts, CoMo/Al/sub 2/O/sub 3/ and low alumina FCC catalyst.

Volcanic ash in feed coal and its influence on coal combustion products

Energy Technology Data Exchange (ETDEWEB)

Brownfield, M.E.; Affolter, R.H.; Cathcart, J.D.; Brownfield, I.K.; Hower, J.C.; Stricker, G.D.; O' Connor, J.T.

2000-07-01

The US Geological Survey and the University of Kentucky Center for Applied Energy Research are collaborating with an Indiana Utility to determine the physical and chemical properties of feed coal and coal combustion products (CCPs) from a coal-fired power plant. The plant utilizes a low-sulfur (.23--.47 weight percent S) coal from the Powder River Basin, Wyoming. Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) analysis of feed coal samples identified two mineral suites. A primary suite (not authigenic) consisting of quartz (detrital and volcanic beta-form grains), biotite, and minor zircon and a secondary authigenic mineral suite containing calcite, alumino-phosphates (crandallite and gorceixite), kaolinite, quartz, anatase, barite, and pyrite. The authigenic minerals are attributed to air-fall and reworked volcanic ash that was deposited in peat-forming mires. The Powder River Basin feed coals contain higher amounts of Ba, Ca, Mg, Na, Sr, and P compared to other analyzed eastern coals. These elements are associated with alumino-phosphate, biotite, calcite, and clay minerals. The element associations are indicative of coal that incorporated volcanic ash during deposition. XRD analysis of CCPs revealed a predominance of glass, perovskite, lime, gehlenite, quartz, and phosphates with minor amounts of periclase, anhydrite, hematite, and spinel group minerals in the fly ash; and quartz, plagioclase (albite and anorthite), pyroxene (augite and fassaite), rhodonite, and akermanite in the bottom ash. Microprobe and SEM analysis of fly ash samples revealed quartz, zircon, monazite, euhedral laths of corundum with merrillite, hematite, dendritic spinels/ferrites, and rounded grains of wollastonite with periclase. The abundant Ca and Mg mineral phases in the fly ashes are related to the presence of carbonate, clay, and phosphate minerals in the feed coal. The Ca- and Mg-rich mineral phases in the CCPs can be attributed to volcanic minerals deposited in the

Role of non-ferrous coal minerals and by-product metallic wastes in coal liquefaction. Technical progress report, September 1, 1980-November 30, 1980

Energy Technology Data Exchange (ETDEWEB)

Garg, D.; Givens, E.N.; Schweighardt, F.K.; Curtis, C.W.; Guin, J.A.; Shridharani, K.; Huang, W.J.

1981-02-01

The effects of minerals and inexpensive ores or by-products (pyrites, red mud, flue dust, speculites, zinc sulfides, calcium oxide, dolomites, mica, molybdenite) in catalysing coal liquefaction or the hydrogenation of process solvents was studied with different cokes and solvents. Improved results were obtained in several cokes and th results are given in terms of oil fields, hydrogen consumption, desulfurization of SRC, etc. The addition of pyrite resulted in increased production of oils and increased conversion of coal; however, the effects varied from coal to coal. Dolomite, mica and molybdenite had insignificant catalytic activity. The reduction of pyrite, Fe/sub 2/O/sub 3/ and Fe/sub 3/O/sub 4/ at process conditions was studied. (LTN)

Miners' return to work following injuries in coal mines.

Science.gov (United States)

Bhattacherjee, Ashis; Kunar, Bijay Mihir

2016-12-22

The occupational injuries in mines are common and result in severe socio-economical consequences. Earlier studies have revealed the role of multiple factors such as demographic factors, behavioral factors, health-related factors, working environment, and working conditions for mine injuries. However, there is a dearth of information about the role of some of these factors in delayed return to work (RTW) following a miner's injury. These factors may likely include personal characteristics of injured persons and his or her family, the injured person's social and economic status, and job characteristics. This study was conducted to assess the role of some of these factors for the return to work following coal miners' injuries. A study was conducted for 109 injured workers from an underground coal mine in the years 2000-2009. A questionnaire, which was completed by the personnel interviews, included among others age, height, weight, seniority, alcohol consumption, sleeping duration, presence of diseases, job stress, job satisfaction, and injury type. The data was analyzed using the Kaplan-Meier estimates and the Cox proportional hazard model. According to Kaplan-Meier estimate it was revealed that a lower number of dependents, longer sleep duration, no job stress, no disease, no alcohol addiction, and higher monthly income have a great impact on early return to work after injury. The Cox regression analysis revealed that the significant risk factors which influenced miners' return to work included presence of disease, job satisfaction and injury type. The mine management should pay attention to significant risk factors for injuries in order to develop effective preventive measures. Med Pr 2016;67(6):729-742. This work is available in Open Access model and licensed under a CC BY-NC 3.0 PL license.

Maximum Aerobic Capacity of Underground Coal Miners in India

Directory of Open Access Journals (Sweden)

Ratnadeep Saha

2011-01-01

Full Text Available Miners fitness test was assessed in terms of determination of maximum aerobic capacity by an indirect method following a standard step test protocol before going down to mine by taking into consideration of heart rates (Telemetric recording and oxygen consumption of the subjects (Oxylog-II during exercise at different working rates. Maximal heart rate was derived as 220−age. Coal miners reported a maximum aerobic capacity within a range of 35–38.3 mL/kg/min. It also revealed that oldest miners (50–59 yrs had a lowest maximal oxygen uptake (34.2±3.38 mL/kg/min compared to (42.4±2.03 mL/kg/min compared to (42.4±2.03 mL/kg/min the youngest group (20–29 yrs. It was found to be negatively correlated with age (r=−0.55 and −0.33 for younger and older groups respectively and directly associated with the body weight of the subjects (r=0.57 – 0.68, P≤0.001. Carriers showed maximum cardio respiratory capacity compared to other miners. Indian miners VO2max was found to be lower both compared to their abroad mining counterparts and various other non-mining occupational working groups in India.

SULPHIDE MINERALIZATION IN UPPER WESTPHALIAN COAL SEAMS FROM THE EASTERN PART OF THE UPPER SILESIAN COAL BASIN

Directory of Open Access Journals (Sweden)

Lipiarski Ireneusz

1997-10-01

Full Text Available Morphologically diversified sulphide mineralization has been found in No. 301 and 302 coal seams (Westphalian B. The main sulphide is pyrite which forms veinlets cross-cutting the sedimentary fabrics of the coal, encrusts the cellular structures and intergrowths with oxysulphides. Two generations of pyrites were observed: the preceding and the following the oxysulphides. Pyrite composition is stoichiometric, rare admixtures are up to(in wt.%: Mn - 0.19, Co - 0.48, Ni - 0.42 and As - 1.41. Iron oxysulphides contain up to 35.06 wt.% oxygen. Their composition varies between FeS2O and FeS2O3. Increased contents of As (up to 1.46 wt.% and Pb (up to 0.96 wt.% were detected.

A prospective cohort study among new Chinese coal miners: the early pattern of lung function change

Energy Technology Data Exchange (ETDEWEB)

Wang, M.L.; Wu, Z.E.; Du, Q.G.; Petsonk, E.L.; Peng, K.L.; Li, Y.D.; Li, S.K.; Han, G.H.; Atffield, M.D. [NIOSH, Morgantown, WV (United States)

2005-11-01

The early pattern of lung function changes in 317 newly hired Chinese underground coal miners was compared to 132 referents. This three year prospective cohort study involved a pre-employment and 15 follow up health surveys, including a questionnaire and spirometry tests. Twice a month, total and respirable dust area sampling was done. The authors used a two stage analysis and a linear mixed effects model approach to analyse the longitudinal spirometry data, and to investigate the changes in forced expiratory volume in 1 second (FEV1) over time, controlling for age, height, pack years of smoking, mean respirable dust concentration, the room temperature during testing, and the group x time interaction terms. Results: FEV1 change over time in new miners is non-linear. New miners experience initial rapid FEV1 declines, primarily during the first year of mining, little change during the second year, and partial recovery during the third year. Both linear and quadratic time trends in FEV1 change are highly significant. Smoking miners lost more FEV1 than non-smokers. Referents, all age less than 20 years, showed continued lung growth, whereas the miners who were under age 20 exhibited a decline in FEV1. Conclusion: Dust and smoking affect lung function in young, newly hired Chinese coal miners. FEV1 change over the first three years of employment is non-linear. The findings have implications for both methods and interpretation of medical screening in coal mining and other dusty work: during the first several years of employment more frequent testing may be desirable, and caution is required in interpreting early FEV1 declines.

James Craufurd Gregory, 19th century Scottish physicians, and the link between occupation as a coal miner and lung disease.

Science.gov (United States)

Donaldson, K; Wallace, W A; Elliot, T A; Henry, C

2017-09-01

By the mid-19th century about 200,000 miners were employed in a UK coal mining industry still growing with the advances of the Industrial Revolution. Coal miners were long known to suffer poor health but the link to inhaling dust in the mines had not been made. In 1813 George Pearson was the first to suggest that darkening of lungs seen in normal individuals as they aged was caused by inhaled soot from burning oil, candles and coal, which were the common domestic sources of heat and light. In 1831 Dr James Craufurd Gregory first described black pigmentation and disease in the lungs of a deceased coal miner and linked this to pulmonary accumulation of coal mine dust. Gregory hypothesised that the black material seen at autopsy in the collier's lungs was inhaled coal dust and this was confirmed by chemical analysis carried out by Professor Sir Robert Christison. Gregory suggested that coal dust was the cause of the disease and warned physicians in mining areas to be vigilant for the disease. This first description of what came to be known as 'coal worker's pneumoconiosis' sparked a remarkable intellectual effort by physicians in Scotland, culminating in a large body of published work that led to the first understandings of this disease and its link to coalblackened lungs. This paper sets out the history of the role of Scottish physicians in gaining this understanding of coal worker's pneumoconiosis. It describes Gregory's case and the lung - recently discovered in the pathology collection of the Surgeons' Hall Museums, Edinburgh, where it has lain unnoticed for over 180 years - on which Gregory based his landmark paper.

Geochemistry of coals, coal ashes and combustion wastes from coal-fired power stations

International Nuclear Information System (INIS)

Vassilev, S.V.; Vassileva, C.G.

1997-01-01

Contents, concentration trends, and modes of occurrence of 67 elements in coals, coal ashes, and combustion wastes at eleven Bulgarian thermoelectric power stations (TPS) were studied. A number of trace elements in coal and coal ash have concentrations greater than their respective worldwide average contents (Clarke values). Trace elements are concentrated mainly in the heavy accessory minerals and organic matter in coal. In decreasing order of significance, the trace elements in coal may occur as: element-organic compounds; impurities in the mineral matter; major components in the mineral matter; major and impurity components in the inorganic amorphous matter; and elements in the fluid constituent. A number of trace elements in the waste products, similar to coal ashes, exceed known Clarke contents. Trace elements are mainly enriched in non-magnetic, heavy and fine-grained fractions of fly ash. They are commonly present as impurities in the glass phases, and are included in the crystalline components. Their accessory crystalline phases, element-organic compounds, liquid and gas forms, are of subordinate importance. Some elements from the chalcophile, lithophile and siderophile groups may release into the atmosphere during coal burning. For others, the combustion process appears to be a powerful factor causing their relative enrichment in the fly ash and rarely in the bottom ash and slag. 65 refs., 1 fig., 11 tabs

A Novel Real-Time Coal Miner Localization and Tracking System Based on Self-Organized Sensor Networks

Directory of Open Access Journals (Sweden)

Wang Yang

2010-01-01

Full Text Available With the development of information technology, we envision that the key of improving coal mine safety is how to get real-time positions of miners. In this paper, we propose a prototype system for real-time coal miner localization and tracking based on self-organized sensor networks. The system is composed of hardware and software platform. We develop a set of localization hardware devices with the Safety Certificate of Approval for Mining Products include miner node, wired fixed access station, and base with optical port. On the software side, we develop a layered software architecture of node application, server management, and information dissemination and broadcasting. We also develop three key localization technologies: an underground localization algorithm using received signal strength indication- (RSSI- verifying algorithm to reduce the influence of the severe environment in a coal mine; a robust fault-tolerant localization mechanism to improve the inherent defect of instability of RSSI localization; an accurate localization algorithm based on Monte Carlo localization (MCL to adapt to the underground tunnel structure. In addition, we conduct an experimental evaluation based on a real prototype implementation using MICA2 motes. The results show that our system is more accurate and more adaptive in general than traditional localization algorithms.

Facility certification program for coal miners pneumoconiosis

International Nuclear Information System (INIS)

Trout, E.D.; Kelley, J.P.; Larson, V.L.; Herbert, G.L.

1976-01-01

Public Law 91-173, often referred to as the Black Lung Law, called for a chest radiograph of all active coal miners at stated intervals. The National Institute for Occupational Safety and Health was responsible for carrying out the provisions of the law. Among other requirements was a provision for certification of radiological facilities where radiological examinations would be provide. A test object to be radiographed by each such facility was designed and sent to those facilities applying for certification. To date, 284 facilities have applied for certification of which 215 have been approved. A record has been kept of the number of times any approved facility submitted radiographs before approval. A complete listing of the types of equipment used, personnel qualifications and other pertinent data will be reported

Influence of inorganic compounds on the combustion of coal. III. The effect of water of constitution of added compounds, moisture, and mineral matter in coal

Energy Technology Data Exchange (ETDEWEB)

Newall, H F

1939-01-01

The effects on the combustion rate from excess moisture and the addition of selected inorganic substances to powdered coals were determined. The catalytic effect of 19 known inorganic ash constituents on combustion rates was also examined. Alumina and silica were found to inhibit combustion while ferric oxide accelerated it. Titanium, Ge, and B oxides, along with gypsum and calcium phosphate, decreased the rate of combusion, while Ca, Mg, Mn, and V oxides increased combustion rates. Although several of the ash constituents in coal directly affected combustion rates, the effect of adding them to the coal prior to combustion did not correlate with the effect of the mineral matter already in the coal.

STATISTICAL ANALYSYS OF THE SCFE OF A BRAZILAN MINERAL COAL

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DARIVA Cláudio

1997-01-01

Full Text Available The influence of some process variables on the productivity of the fractions (liquid yield times fraction percent obtained from SCFE of a Brazilian mineral coal using isopropanol and ethanol as primary solvents is analyzed using statistical techniques. A full factorial 23 experimental design was adopted to investigate the effects of process variables (temperature, pressure and cosolvent concentration on the extraction products. The extracts were analyzed by the Preparative Liquid Chromatography-8 fractions method (PLC-8, a reliable, non destructive solvent fractionation method, especially developed for coal-derived liquids. Empirical statistical modeling was carried out in order to reproduce the experimental data. Correlations obtained were always greater than 0.98. Four specific process criteria were used to allow process optimization. Results obtained show that it is not possible to maximize both extract productivity and purity (through the minimization of heavy fraction content simultaneously by manipulating the mentioned process variables.

Molecular analysis of p53 and K-ras in lung carcinomas of coal miners

Energy Technology Data Exchange (ETDEWEB)

Sarkar, F.H.; Li, Y.W.; Vallyathan, V. [Wayne State University, Detroit, MI (United States). School of Medicine, Dept. of Pathology

2001-10-01

Thirty-three cases of non-small cell lung cancers (NSCLC) from the archives of National Coal Workers' Autopsy Study were studied for mutational alterations in p53 and K-ras using PCR-SSCP, DNA sequencing and PCR-oligonucleotide probe hybridization techniques. Mutations of the p53 were observed in 4 smokers (19%) and one in a never smoker (8%). Two polymorphisms in smokers were detected at codon 213, a common site for sequence variation. Among the smokers the p53 mutations were in the heavy smokers. In never smokers there was only a single p53 mutation and two K-ras mutations. In never smokers the frequency of K-ras mutations was similar (17%) in smokers, but one never smoker had two K-ras mutations. Mutations of p53 were more frequent in adenocarcinomas (27%) and they were AT-GC transitions. There were two large cell undifferentiated carcinomas with p53 mutation and one with a K-ras mutation. Two of the 16 squamous cell carcinomas were positive for p53 mutation, while no K-ras mutations were found in this group. The results of these preliminary studies indicate a moderately different mutational spectrum of p53 and K-ras in coal miners independent of cigarette smoking. The mutational spectrum observed in this study of coal miners with heavy cigarette smoking history suggest a protective effect of coal mine dust in preventing abnormal mutations induced by chemical carcinogens in cigarette smoke or reactive oxygen species.

Current data on pneumoconiosis in Lorraine coal miners

Energy Technology Data Exchange (ETDEWEB)

Dechoux, J

1975-01-01

Despite great efforts at technical prevention, pneumoconiosis is still common among miners of the Lorraine (France) region. Radiological anomalies are seen much more frequently in coal mining than rock mining areas. The radiological picture has been modified in that grossly nodular forms have almost completely disappeared and are increasingly replaced by punctiform patterns characteristic of mixed-dust pneumoconiosis. Tuberculosis, which in 1953 was the cause of death of some half of silicotic patients, was observed in only about 15% of Lorraine pneumoconiotic subjects in 1973. Changes in the nature of pneumoconiosis, at least as much as therapeutic advances, have increased the mean age at death of Lorraine pneumoconiotic workers from 56.9 in 1953 to 68.8 in 1973.

Gas emissions, minerals, and tars associated with three coal fires, Powder River Basin, USA.

Science.gov (United States)

Engle, Mark A; Radke, Lawrence F; Heffern, Edward L; O'Keefe, Jennifer M K; Hower, James C; Smeltzer, Charles D; Hower, Judith M; Olea, Ricardo A; Eatwell, Robert J; Blake, Donald R; Emsbo-Mattingly, Stephen D; Stout, Scott A; Queen, Gerald; Aggen, Kerry L; Kolker, Allan; Prakash, Anupma; Henke, Kevin R; Stracher, Glenn B; Schroeder, Paul A; Román-Colón, Yomayra; ter Schure, Arnout

2012-03-15

Ground-based surveys of three coal fires and airborne surveys of two of the fires were conducted near Sheridan, Wyoming. The fires occur in natural outcrops and in abandoned mines, all containing Paleocene-age subbituminous coals. Diffuse (carbon dioxide (CO(2)) only) and vent (CO(2), carbon monoxide (CO), methane, hydrogen sulfide (H(2)S), and elemental mercury) emission estimates were made for each of the fires. Additionally, gas samples were collected for volatile organic compound (VOC) analysis and showed a large range in variation between vents. The fires produce locally dangerous levels of CO, CO(2), H(2)S, and benzene, among other gases. At one fire in an abandoned coal mine, trends in gas and tar composition followed a change in topography. Total CO(2) fluxes for the fires from airborne, ground-based, and rate of fire advancement estimates ranged from 0.9 to 780mg/s/m(2) and are comparable to other coal fires worldwide. Samples of tar and coal-fire minerals collected from the mouth of vents provided insight into the behavior and formation of the coal fires. Published by Elsevier B.V.

Inorganic Constituents in Coal

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Rađenović A.

2006-02-01

Full Text Available Coal contains not only organic matter but also small amounts of inorganic constituents. More thanone hundred different minerals and virtually every element in the periodic table have been foundin coal. Commonly found group minerals in coal are: major (quartz, pyrite, clays and carbonates,minor, and trace minerals. Coal includes a lot of elements of low mass fraction of the orderof w=0.01 or 0.001 %. They are trace elements connected with organic matter or minerals comprisedin coal. The fractions of trace elements usually decrease when the rank of coal increases.Fractions of the inorganic elements are different, depending on the coal bed and basin. A varietyof analytical methods and techniques can be used to determine the mass fractions, mode ofoccurrence, and distribution of organic constituents in coal. There are many different instrumentalmethods for analysis of coal and coal products but atomic absorption spectroscopy – AAS is theone most commonly used. Fraction and mode of occurrence are one of the main factors that haveinfluence on transformation and separation of inorganic constituents during coal conversion.Coal, as an important world energy source and component for non-fuels usage, will be continuouslyand widely used in the future due to its relatively abundant reserves. However, there is aconflict between the requirements for increased use of coal on the one hand and less pollution onthe other. It’s known that the environmental impacts, due to either coal mining or coal usage, canbe: air, water and land pollution. Although, minor components, inorganic constituents can exert asignificant influence on the economic value, utilization, and environmental impact of the coal.

The cytological status of the nasal mucosa and the buccal epithelium in coal miners

Energy Technology Data Exchange (ETDEWEB)

L.T. Bazeliuk; B.M. Salimbaeva

2006-11-15

Sixty-four persons were examined. The examination was undertaken to study the cytomophological parameters of the cells of the nasal mucosa and the buccal epithelium in coal miners. Group 1 consisted of 18 donors without contact with industrial dust; Group 2 comprised 24 apparently healthy miners; Group 3 included 22 workers (drift miners) with Stage 1 anthracosilicosis, grade 1 respiratory failure. The patients with Stage 1 anthracosilicosis had noticeably worse morphofunctional characteristics of the epithelium that displayed extensive fields with pronounced structural changes, such as destruction and desquamation of the integumentary epithelium of the nasal mucosa. Nasal mucosal atrophic changes were observed in 50% of the examined miners. Examination of the buccal epithelium in apparently healthy miners (code 0) and in workers with Stage I anthracosilicosis revealed the increased proportion of microfloral (Streptococcus) contamination by 79% and 3.7 times, respectively.

King coal: miners, coal, and Britain's industrial future

Energy Technology Data Exchange (ETDEWEB)

Hall, T.

1981-01-01

The coal industry in the United Kingdom and the history of the mineworkers, from their attempts at unionization until the present day, are described. Reasons for the policy of closing pits and dismantling the coal industry, and for importing coal are discussed and analyzed.

Cleaning and dewatering fine coal

Science.gov (United States)

Yoon, Roe-Hoan; Eraydin, Mert K.; Freeland, Chad

2017-10-17

Fine coal is cleaned of its mineral matter impurities and dewatered by mixing the aqueous slurry containing both with a hydrophobic liquid, subjecting the mixture to a phase separation. The resulting hydrophobic liquid phase contains coal particles free of surface moisture and droplets of water stabilized by coal particles, while the aqueous phase contains the mineral matter. By separating the entrained water droplets from the coal particles mechanically, a clean coal product of substantially reduced mineral matter and moisture contents is obtained. The spent hydrophobic liquid is separated from the clean coal product and recycled. The process can also be used to separate one type of hydrophilic particles from another by selectively hydrophobizing one.

The application of the coal grain analysis method to coal liberation studies

Energy Technology Data Exchange (ETDEWEB)

O' Brien, G.; Firth, B.; Adair, B. [CSIRO Earth Science & Resource Engineering Brisbane, Qld. (Australia)

2011-07-01

Emerging coal markets such as the use of coal for conversion to liquid fuels and its use in fuels cells and as coal water slurries in diesel engines require coal products with different coal quality specifications than those applicable to traditional coal markets of coke making and conventional power generation. As well as quantifying coals in terms of their chemical and physical properties, detailed knowledge of the mineral inclusions within the coal particles is required to identify coals that are suited to economically produce the low-ash value coals required for these markets. After mining and processing, some particles can consist of essentially pure components of a single maceral or mineral phase whilst others are composite particles that are comprised of varying amounts of macerals and minerals. The proportion of particles that are present as pure components or as composites will be a function of the characteristics of the coal and the particle size. In general, it is considered that size reduction will result in liberation and hence increased yield. The amount of liberation that occurs during crushing or grinding a coal is however coal specific. Particle characterization information provided by an optical microscopic-imaging method, Coal Grain Analysis, was used to identify coals that might benefit from additional crushing to improve recovery of clean coal by new density separation techniques and by flotation. As expected, the results of these studies suggest that the degree of liberation that is obtained is coal specific, and, hence, yield improvements are also coal specific. Hence a quantitative method of investigating this issue is required.

Associations of symptoms related to isocyanate, ureaformol, and formophenolic exposures with respiratory symptoms and lung function in coal miners

Energy Technology Data Exchange (ETDEWEB)

Bertrand, J.P.; Simon, V.; Chau, N. [Houilleres Bassin Lorraine, Freyming Merlebach (France)

2007-04-15

The respiratory effects of diphenylmethane diisocyanate (MDI)-based resins and ureaformol- and formophenolic-based resins, used in coal mining, are unknown. This cross-sectional study of 354 miners evaluated respiratory health in miners with MDI-related symptoms (IS) and ureaformol/formophenolic-related symptoms (UFS). The protocol included clinical examination, chest radiograph, questionnaire on respiratory symptoms, smoking habit, job history, resin handling, and spirometry. Resin handling concerned 27.7% of the miners. IS affected 5.6%, and 1.4% also after work. UFS affected 22.6%, and 2.3% also after work. Wheezing affected 35.6%; chronic cough, expectoration, or bronchitis about 10%; dyspnea 5.4%; and asthma 2.8%. The miners with UFS had significantly more frequent chronic cough, expectoration, chronic bronchitis, dyspnea, and wheezing, whereas those with IS at and after work had markedly lower FVC, FEV1, MMEF, FEF50% and FEF25%. These findings raise the possibility of deleterious effects of exposures to MDI and ureaformol/ ormophenolic resins on respiratory health and lung function in coal miners during their working life.

Daughters of the mountain: women coal miners in central Appalachia

Energy Technology Data Exchange (ETDEWEB)

Tallichet, S.E. [Morehead State University in Kentucky, KY (United States). Department of Sociology, Social Work, and Criminology

2006-10-15

The book introduces us to a cohort of women miners at a large underground coal mine in southern West Virginia, where women entered the workforce in the late 1970s after mining jobs began opening up for women throughout the Appalachian coalfields. The work goes beyond anecdotal evidence to provide complex and penetrating analyses of qualitative data. Based on in-depth interviews with including social relations among men and women, professional advancement, and union participation. She also explores the ways in which women adapt to mining culture, developing strategies for both resistance and accommodation to an overwhelmingly male-dominated world. 1 app.

Quantitative determination of mineral coal impurities from Brazil through optical emission spectrography technique

International Nuclear Information System (INIS)

Clain, Almir Faria

1982-01-01

The aim of the present research was to develop a spectrographic technique to determine the highest possible number of the chemical elements micro-constituents of Brazilian mineral coals. The experimental technique developed corresponds to the so called total-burning procedure. Coal samples were calcined to ashes at 400°C and then totally burned in graphite electrodes by a DC arc. The spectrographic measurements were made in a Jarrell-Ash emission spectrograph, Ebert mounting type, model Mark IV. An inert atmosphere chamber (for a gaseous mixture 20% 0 2 and 80% air) and a seven step rotating sector were used as main accessories. The analytical curves for the different elements, were obtained using synthetic standards in the concentration range of 10 to 1.000 ppm, and the standards as well as the coal ashes were diluted with spectrographically pure graphite in 1:1 ratio. Seventeen coal samples from different shells and strata of Morungava and Charqueadas mines - Rio Grande do Sul State - were analyzed to test the proposed technique, being possible to determine the following elements: B, Be, Bi, Cd, Co, Cr, Cu, Ga,Pb, Ge, Mn, Mo, Ni, Sn, Sb, V, Y, Zn and Zr. The coefficient of variation was 14% in average for all the elements and the sensitivity was so that the majority of the impurities present in the coals were analyzed. (author)

Electric plants to gas, influence of both Mineral Matter and Air Oxidation in coal pyrolysis

International Nuclear Information System (INIS)

Mondragon, F.; Jaramillo, A.; Quintero, G.

1995-01-01

In this work some coal samples from different Colombia's deposits are analyzed. In first stage, material matter is removed from coal by acid treatment with HF/HCl, and aerial oxidation of coal is made with air in oven to 150 Centigrade degree temperature. In second stage, pyrolysis is carried out in two different techniques: 1. Thermogravimetric Analysis (TGA) and 2. Programmed Temperature Pyrolysis (PTP) in a pyrolyzer equipped with a quadrupole mass spectrometer. In both techniques, the coal samples are heated in different rates to 650 Centigrade degree. During PTP trials the evolution of CH4, H2S, hydrocarbons (m/z=42), CO2, benzene and toluene are monitored. Studied coal samples showed: 1). A gas conversion range between 48.8% to 21.8%; 2). A decrease in the gas conversion between 2% to 4%, when oxidation it is applied; 3). The temperature at the one which is presented the maximum evolution of CH4 is similar for all coal samples; 4). The maximum evolution of H2S depends on mineral matter composition, occurs between 480 to 550 Centigrade degrees and is presented due to pyrite decomposition. 5). The evolution of CO2 occurs between 100 to 650 Centigrade degree, its production is generated in different stage of the mentioned temperature range, and in some coal samples is presented due to inorganic origin

Use of clay-mineral alteration patterns to define syntectonic permeability of joints (cleat) in Pennsylvania anthracite coal

Energy Technology Data Exchange (ETDEWEB)

Daniels, E.J.; Marshak, S.; Altaner, S.P. [Chevron Oil Field Research Company, La Habra, CA (United States)

1996-10-15

Joints (cleat) in Pennsylvania anthracite contain two distinct clay-mineral assemblages, both of which formed by alteration of preexisting kaolinite at peak metamorphic conditions during the Alleghanian orogeny. The first assemblage, NH{sub 4} - illite or pyrophyllite {+-} quartz, formed by reaction of kaolinite with methane-rich fluids derived from within the coal. The second assemblage, sudoite {+-} tosudite {+-} rectorite {+-} berthierine, formed by the reaction of kaolinite with ferromagnesian-bearing hydrothermal fluids which must have come from outside the coal. In an earlier paper, the authors suggested that the first assemblage indicated clay diagenesis in low-permeability environments, and that the second assemblage indicated clay diagenesis in high-permeability environments. If this premise is correct, then the distribution of clay-mineral alteration assemblages serves to define syntectonic permeability variations in coal cleat. The first assemblage dominates in the coal matrix itself, in isolated cleat, in cleat that parallel the regional trend of Alleghanian folds, and in the mirror portions of cleat oriented perpendicular to the fold trends, suggesting that these regions are low-permeability environments. The second assemblage dominates in the hackle fringe of interconnected cleat that trend perpendicular to the strike of the Appalachian orogen, suggesting that these regions are high-permeability environments. These results emphasize that syntectonic cleat permeability is a function of cleat orientation, macroscopic cleat interconnetivity and orientation, as well as microscopic cleat-surface morphology.

Exposure to radon and mortality standard in a coal miner cohort in Brazil

International Nuclear Information System (INIS)

Veiga, Lene Holanda Sadler; Amaral, Eliana; Koifman, Sergio

2002-01-01

High levels of radon and his products have been found at a underground coal mine, at the Southern Brazil, in operation since 1945. The 222 Rn concentration levels measured were 7000 Bq/m 3 and 0.7 WL for the radon sons (7.7 WLM/year), which are values considered higher than the limits for intervention in a working environments (500 to 1500 Bq/m3 of 222 Rn) and the occupational exposure limit (4.0 WLM/year). Due to the unique opportunity found in these miner group, it was decided to construct a cohort with miners from that mining (underground and surface) viewing the evaluation of the possible effects to the health decurrens from that exposure

Investigation of the potential of coal combustion fly ash for mineral sequestration of CO2 by accelerated carbonation

International Nuclear Information System (INIS)

Ukwattage, N.L.; Ranjith, P.G.; Wang, S.H.

2013-01-01

Mineral carbonation of alkaline waste materials is being studied extensively for its potential as a way of reducing the increased level of CO 2 in the atmosphere. Carbonation converts CO 2 into minerals which are stable over geological time scales. This process occurs naturally but slowly, and needs to be accelerated to offset the present rate of emissions from power plants and other emission sources. The present study attempts to identify the potential of coal fly ash as a source for carbon storage (sequestration) through ex-situ accelerated mineral carbonation. In the study, two operational parameters that could affect the reaction process were tested to investigate their effect on mineralization. Coal fly ash was mixed with water to different water-to-solid ratios and samples were carbonated in a pressure vessel at different initial CO 2 pressures. Temperature was kept constant at 40 °C. According to the results, one ton of Hazelwood fly ash could sequester 7.66 kg of CO 2 . The pressure of CO 2 inside the vessel has an effect on the rate of CO 2 uptake and the water-to-solid ratio affects the weight gain after the carbonation of fly ash. The results confirm the possibility of the manipulation of process parameters in enhancing the carbonation reaction. - Highlights: ► Mineral sequestration CO 2 by of coal fly ash is a slow process under ambient conditions. ► It can be accelerated by manipulating the process parameters inside a reactor. ► Initial CO 2 pressure and water to solid mixing ratio inside the reactor are two of those operational parameters. ► According to the test results higher CO 2 initial pressure gives higher on rates of CO 2 sequestration. ► Water to fly ash mixing ratio effect on amount of CO 2 sequestered into fly ash

Characterization of Egyptian coal from Sinai using Moessbauer spectroscopy

International Nuclear Information System (INIS)

Eissa, N.A.; Abdel Meguid, M.M.; Deriu, A.; Albanese, G.

1983-08-01

The presence of iron bearing minerals in coal makes the Moessbauer Spectroscopy (MS) extremely useful for characterization of coals from different localities. In this paper the MS has been applied to characterize Egyptian coal from Sinai (Maghara). The chemical analysis of this coal is given. The MS results showed that pyritic sulphur (pyrite and marcasite) is the only bearing mineral in Egyptian coal. A review is given for the iron bearing minerals in coals from different countries measured by MS. (author)

Applying a health action model to predict and improve healthy behaviors in coal miners.

Science.gov (United States)

Vahedian-Shahroodi, Mohammad; Tehrani, Hadi; Mohammadi, Faeze; Gholian-Aval, Mahdi; Peyman, Nooshin

2018-05-01

One of the most important ways to prevent work-related diseases in occupations such as mining is to promote healthy behaviors among miners. This study aimed to predict and promote healthy behaviors among coal miners by using a health action model (HAM). The study was conducted on 200 coal miners in Iran in two steps. In the first step, a descriptive study was implemented to determine predictive constructs and effectiveness of HAM on behavioral intention. The second step involved a quasi-experimental study to determine the effect of an HAM-based education intervention. This intervention was implemented by the researcher and the head of the safety unit based on the predictive construct specified in the first step over 12 sessions of 60 min. The data was collected using an HAM questionnaire and a checklist of healthy behavior. The results of the first step of the study showed that attitude, belief, and normative constructs were meaningful predictors of behavioral intention. Also, the results of the second step revealed that the mean score of attitude and behavioral intention increased significantly after conducting the intervention in the experimental group, while the mean score of these constructs decreased significantly in the control group. The findings of this study showed that HAM-based educational intervention could improve the healthy behaviors of mine workers. Therefore, it is recommended to extend the application of this model to other working groups to improve healthy behaviors.

The release of mineral matter and associated phosphorus as a function of the particle size coal

Energy Technology Data Exchange (ETDEWEB)

Claassens, V. [Sasol Technology Research & Development, Sasolburg (South Africa). Syngas & Coal Technologies

2009-05-15

The presence of phosphorus in carbon reductants is a major concern in the metallurgical industry. The behaviour of the phosphorus and mineral matter content (reported as ash) as a function of particle size was investigated. The primary aim of this study was to determine the reduction in phosphorus and mineral matter that occurred as the particle size decreased. A secondary aim was to determine how the phosphorus was distributed in the feed coal and to where it reported during floc-flotation. Results showed that the ash content decreased more rapidly than the phosphorus content as the mean particle size was reduced. It remains unclear why P-rejection is only half as effective as mineral matter rejection. Detailed liberation analysis of P-containing minerals is required to possibly explain this phenomenon.

The assessment of micronucleus frequency in lymphocytes in the cohort of coal-miners characterized by different polymorphisms of double strand break reparation genes

Directory of Open Access Journals (Sweden)

Maxim Yur'yevich Sinitsky

2015-12-01

Full Text Available Background: Coal-miners are exposed to a lot of number of harmful factors (chemical agents, ionizing radiation, heavy metals, coal dust etc.. Material and methods: Venous blood samples extracted from 129 coal-miners. Assessment of cytogenetic damage was performed using the cytokinesis-block micronucleus assay (CBMN on peripheral blood lymphocytes. PCR and gel electrophoresis were used to determine polymorphisms in the genes Lig4 (rs1805388 and XRCC4 (rs6869366. Results: We found a significant increase in the frequency of binucleated lymphocytes with micronuclei (MN and protrusions in carriers of the Ile/ Ile genotype of the Lig4 gene Thr9Ile polymorphism in comparison to Thr/Thr and Thr/Ile genotypes. Conclusions: Thr9Ile polymorphism within Lig4 gene can be used as potential molecular genetic markers of increased individual susceptibility to the complex of harmful factors in coal-mining conditions.

Health status of anthracite surface coal miners

International Nuclear Information System (INIS)

Amandus, H.E.; Petersen, M.R.; Richards, T.B.

1989-01-01

In 1984-1985, medical examinations consisting of a chest radiograph, spirometry test, and questionnaire on work history, respiratory symptoms, and smoking history were administered to 1,061 white males who were employed at 31 coal cleaning plants and strip coal mines in the anthracite coal region of northeastern Pennsylvania. The prevalence of radiographic evidence of International Labour Office (ILO) category 1 or higher small opacities was 4.5% in 516 men who had never been employed in a dusty job other than in surface coal mining. Among these 516 workers, all 4 cases of ILO radiographic category 2 or 3 rounded opacities and 1 case of large opacities had been employed as a highwall drill operator or helper. The prevalence of category 1 or higher opacities increased with tenure as a highwall drill operator or helper (2.7% for 0 y, 6.5% for 1-9 yr, 25.0% for 10-19 y, and 55.6% for greater than or equal to 20 y drilling). Radiographic evidence of small rounded opacities, dyspnea, and decreases in FEV1.0, FVC, and peak flow were significantly related to tenure at drilling operations after adjusting for age, height, cigarette smoking status, and exposures in dusty jobs other than in surface coal mining. However, tenure in coal cleansing plants and other surface coal mine jobs were not related to significant health effects. The apparent excess prevalence of radiographic small rounded opacities in anthracite surface coal mine drillers suggests that quartz exposures have been increased. Average respirable quartz concentrations at surface coal mine drilling operations should be evaluated to determine whether exposures are within existing standards, and dust exposures should be controlled

Elaboration of new ceramic microfiltration membranes from mineral coal fly ash applied to waste water treatment.

Science.gov (United States)

Jedidi, Ilyes; Saïdi, Sami; Khemakhem, Sabeur; Larbot, André; Elloumi-Ammar, Najwa; Fourati, Amine; Charfi, Aboulhassan; Salah, Abdelhamid Ben; Amar, Raja Ben

2009-12-15

This work aims to develop a new mineral porous tubular membrane based on mineral coal fly ash. Finely ground mineral coal powder was calcinated at 700 degrees C for about 3 h. The elaboration of the mesoporous layer was performed by the slip-casting method using a suspension made of the mixture of fly-ash powder, water and polyvinyl alcohol (PVA). The obtained membrane was submitted to a thermal treatment which consists in drying at room temperature for 24 h then a sintering at 800 degrees C. SEM photographs indicated that the membrane surface was homogeneous and did not present any macrodefects (cracks, etc...). The average pore diameter of the active layer was 0.25 microm and the thickness was around 20 microm. The membrane permeability was 475 l/h m(2) bar. This membrane was applied to the treatment of the dying effluents generated by the washing baths in the textile industry. The performances in term of permeate flux and efficiency were determined and compared to those obtained using a commercial alumina microfiltration membrane. Almost the same stabilised permeate flux was obtained (about 100 l h(-1)m(-2)). The quality of permeate was almost the same with the two membranes: the COD and color removal was 75% and 90% respectively.

Washability characteristics of residual coals obtained from solvent extraction: studies towards developing cleaner coal technology

Energy Technology Data Exchange (ETDEWEB)

Giri, C.C.; Sharma, D.K. [Indian Institute of Technology, New Delhi (India). Centre for Energy Studies

2004-07-01

The washability characteristics of original Indian coals and solvent-extracted residual coals were studied by the float and sink technique. The following conclusions were drawn on the basis of the present study. Anthracene oil-extracted residual coals have lower percentage of reactions in the specific gravity range of 1.4 to 1.6 than the original coals, which indicates that the mineral matter is disassociated from the organic mass, and the anthracene oil-extracted residual coal is more suitable for washing than the original coal. The floatability behaviour of coal increases during NMP (N-methyl-2-pyrrolidone) extraction. This indicates that coal changes its washability character during NMP extractions. As during NMP extraction the surface area of coal increases by creating fissures in the matrix, the chemical leaching technique would be more suitable to remove the mineral matter in the residual coals. 12 refs., 3 figs., 2 tabs.

Mineralization of PAHs in coal-tar impacted aquifer sediments and associated microbial community structure investigated with FISH

Energy Technology Data Exchange (ETDEWEB)

Rogers, S W; Ong, S K; Moorman, T B [Iowa State University, Ames, IA (USA)

2007-11-15

The microbial community structure and mineralization of polycyclic aromatic hydrocarbons (PAHs) in a coal-tar contaminated aquifer were investigated spatially using fluorescence in situ hybridization (FISH) and in laboratory-scale incubations of the aquifer sediments. DAPI-detected microbial populations in the contaminated sediments were three orders of magnitude greater than nearby uncontaminated sediments, suggesting growth on coal-tar constituents in situ. Actinobacteria, {beta}- and {gamma}-Proteobacteria, and Flavobacteria dominated the in situ aerobic (> 1 mg l{sup -1} dissolved oxygen) microbial community, whereas sulfate-reducing bacteria comprised 37% of the microbial community in the sulfidogenic region of the aquifer. Rapid mineralization of naphthalene and phenanthrene were observed in aerobic laboratory microcosms and resulted in significant enrichment of {beta}- and {gamma}-Proteobacteria potentially explaining their elevated presence in situ. Nitrate- and sulfate-limited mineralization of naphthalene in laboratory microcosms occurred to a small degree in aquifer sediments from locations where groundwater chemistry indicated nitrate- and sulfate-reduction, respectively. The results of this study suggest that FISH may be a useful tool for providing a link between laboratory microcosms and groundwater measurements made in situ necessary to better demonstrate the potential for natural attenuation at complex PAH contaminated sites.

Coal, culture and community

Energy Technology Data Exchange (ETDEWEB)

NONE

1993-11-01

16 papers are presented with the following titles: the miners; municipalisation and the millenium - Bolton-upon-Dearne Urban District Council 1899-1914; the traditional working class community revisited; the cultural capital of coal mining communities; activities, strike-breakers and coal communities; the limits of protest - media coverage of the Orgreave picket during the miners` strike; in defence of home and hearth? Families, friendships and feminism in mining communities; young people`s attitudes to the police in mining communities; the determinants of productivity growth in the British coal mining industry, 1976-1989; strategic responses to flexibility - a case study in coal; no coal turned in Yorkshire?; the North-South divide in the Central Coalfields; the psychological effects of redundancy and worklessness - a case study from the coalfields; the Dearne Valley initiative; the future under labour: and coal, culture and the community.

Basinal analysis of the Ecca and Lowermost Beaufort Beds and associated coal, uranium and heavy mineral beach sand occurrences

International Nuclear Information System (INIS)

Ryan, P.J.; Whitfield, G.G.

1979-01-01

The regional sediment transport directions, major provenance areas and the controlling palaeotectonic and palaeogeographic frameworks of sedimentation have been reconstructed for the Great Karoo Basin during the Permian. Analyses of this magnitude can be useful in regional exploration programmes for coal, uranium and fossil heavy mineral beach sand deposits. The strong palaeogeographic control on coal deposition is demonstrated by the fact that some of the most important deposits accumulated in topographically low lying areas on the pre-Karoo surface. Such areas formed sheltered environments ideal for the growth and accumulation of organic material. Elsewhere relatively slow rates of subsidence of a broad, protected, low lying delta plain controlled the deposition of coal. North of the main Karoo Basin many of the coal deposits are confined to structurally controlled linear basins. Hundreds of sedimentary uranium occurrences of varying grade and size occur within a broad, discontinuous belt in the Lower Beaufort of the southwestern portion of the Karoo Basin. The uranium mineralization occurs in a variety of fluvial deposits usually rich in carbonaceous material. Minute tuffaceous fragments, reflecting contemporaneous vulcanism, form a minor but significant constituent in some of the uraniferous sandstones. The uranium occurrences are confined largely to the Southern and Western Facies of the Lower Beaufort, and occur mainly within the confines of the Karoo Trough. Consolidated heavy mineral beach deposits have been found in the predominantly fluvio-deltaic Middle Ecca Group of the Northern Facies at a number of widely separated locations. These deposits were formed by shore line processes, such as the reworking of delta-front sands, during periods of temporary marine regression

[Disorders of locomotor system and effectiveness of physiotherapy in coal miners].

Science.gov (United States)

Bilski, Bartosz; Bednarek, Agata

2003-01-01

The aim of the survey was to analyze the efficacy of physiotherapy applied in coal miners as well as to assess their locomotor system load and the effects of working conditions in mines. The questionnaire survey covered a group of 51 miners, aged 28-76 years (mean, 54 years), undergoing physiotherapeutic procedures in the mine out-patient clinic during the first quarter of 2003. The survey revealed that lumbosacral disorders were the most frequent locomotor system complaints reported by miners, especially those who work in a bending down position. According to the clinical data, spondylosis and allied disorders were the main reasons for pain in this part of the body. Having analyzed the relationship between age and occurrence of back pains, the majority of complaints were found in the 46-55 age group (two complaints per one respondent). The analysis of the association between back pains and duration of employment revealed that the complaints for the locomotor system occurred already after a five-year employment. The survey showed that the application of physiotherapeutic procedures diminished the back pain in the study group by 2.83 on average on the 0-10 scale. It was also found that magnetotherapy proved to be the most effective method in treating the spinal degenerative changes.

Emphysema and pulmonary impairment in coal miners: Quantitative relationship with dust exposure and cigarette smoking

Science.gov (United States)

Kuempel, E. D.; Vallyathan, V.; Green, F. H. Y.

2009-02-01

Coal miners have been shown to be at increased risk of developing chronic obstructive pulmonary diseases including emphysema. The objective of this study was to determine whether lifetime cumulative exposure to respirable coal mine dust is a significant predictor of developing emphysema at a clinically-relevant level of severity by the end of life, after controlling for cigarette smoking and other covariates. Clinically-relevant emphysema severity was determined from the association between individuals' lung function during life (forced expiratory volume in one second, FEV1, as a percentage of predicted normal values) and emphysema severity at autopsy (as the proportion of lung tissue affected). In a logistic regression model, cumulative exposure to respirable coal mine dust was a statistically significant predictor of developing clinically-relevant emphysema severity, among both ever-smokers and never-smokers. The odds ratio for developing emphysema associated with FEV1 <80% at the cohort mean cumulative coal dust exposure (87 mg/m3 x yr) was 2.30 (1.46-3.64, 95% confidence limits), and at the cohort mean cigarette smoking (among smokers: 42 pack-years) was 1.95 (1.39-2.79).

Emphysema and pulmonary impairment in coal miners: quantitative relationship with dust exposure and cigarette smoking

Energy Technology Data Exchange (ETDEWEB)

E.D. Kuempel; V. Vallyathan; F.H.Y. Green [National Institute for Occupational Safety and Health, Cincinnati, OH (United States)

2009-07-01

Coal miners have been shown to be at increased risk of developing chronic obstructive pulmonary diseases including emphysema. The objective of this study was to determine whether lifetime cumulative exposure to respirable coal mine dust is a significant predictor of developing emphysema at a clinically-relevant level of severity by the end of life, after controlling for cigarette smoking and other covariates. Clinically-relevant emphysema severity was determined from the association between individuals' lung function during life (forced expiratory volume in one second, FEV{sub 1}, as a percentage of predicted normal values) and emphysema severity at autopsy (as the proportion of lung tissue affected). In a logistic regression model, cumulative exposure to respirable coal mine dust was a statistically significant predictor of developing clinically-relevant emphysema severity, among both ever-smokers and never-smokers. The odds ratio for developing emphysema associated with FEV1 <80% at the cohort mean cumulative coal dust exposure (87 mg/m{sup 3} x yr) was 2.30 (1.46-3.64, 95% confidence limits), and at the cohort mean cigarette smoking (among smokers: 42 pack-years) was 1.95 (1.39-2.79). 20 refs., 2 figs., 2 tabs.

Emphysema and pulmonary impairment in coal miners: Quantitative relationship with dust exposure and cigarette smoking

Energy Technology Data Exchange (ETDEWEB)

Kuempel, E D [National Institute for Occupational Safety and Health, Education and Information Division, Risk Evaluation Branch, Cincinnati, Ohio (United States); Vallyathan, V [National Institute for Occupational Safety and Health, Health Effects Laboratory Division, Pathology and Physiology Research Branch, Morgantown, West Virginia (United States); Green, F H Y, E-mail: ekuempel@cdc.go [Department of Pathology, Faculty of Medicine, University of Calgary, Calgary, Alberta (Canada)

2009-02-01

Coal miners have been shown to be at increased risk of developing chronic obstructive pulmonary diseases including emphysema. The objective of this study was to determine whether lifetime cumulative exposure to respirable coal mine dust is a significant predictor of developing emphysema at a clinically-relevant level of severity by the end of life, after controlling for cigarette smoking and other covariates. Clinically-relevant emphysema severity was determined from the association between individuals' lung function during life (forced expiratory volume in one second, FEV{sub 1}, as a percentage of predicted normal values) and emphysema severity at autopsy (as the proportion of lung tissue affected). In a logistic regression model, cumulative exposure to respirable coal mine dust was a statistically significant predictor of developing clinically-relevant emphysema severity, among both ever-smokers and never-smokers. The odds ratio for developing emphysema associated with FEV{sub 1} <80% at the cohort mean cumulative coal dust exposure (87 mg/m{sup 3} x yr) was 2.30 (1.46-3.64, 95% confidence limits), and at the cohort mean cigarette smoking (among smokers: 42 pack-years) was 1.95 (1.39-2.79).

Concentrations of lithium in Chinese coals

Energy Technology Data Exchange (ETDEWEB)

Sun, Yuzhuang; Li, Yanheng; Zhao, Cunliang; Lin, Mingyue; Wang, Jinxi; Qin, Shenjun [Hebei University of Engineering, Handan (China). Key Laboratory of Resource Exploration Research of Hebei Province

2010-04-15

Lithium is an important energy metal. Its concentrations in coals have been studied by many geologists. Its average content is only 14 mg/kg in the coals of the world. Lithium has never been reported as a coal associated deposit before. In order to study the concentrations in Chinese coals, 159 coal and gangue samples were taken from six coal mines and were determined by ICP-MS and the minerals in the samples were identified by X-ray powder diffraction. The results indicate that the Li contents in the coal samples from the Antaibao Coal Mine have reached the industry grade of coal associated deposits. In Tongxing Coal Mine, Li contents in the coal floor rock samples have reached the industry grade of independent lithium deposits. Main minerals are polylithionite, triphylite, zinnwaldite, lithionite and cookeite, which were transported into the peats. Therefore, lithium enriched is most likely in the synsedimentary stage in both coal mines. Furthermore, a revised average Li content in Chinese coals was given.

The application of artificial intelligence for the identification of the maceral groups and mineral components of coal

Science.gov (United States)

Mlynarczuk, Mariusz; Skiba, Marta

2017-06-01

The correct and consistent identification of the petrographic properties of coal is an important issue for researchers in the fields of mining and geology. As part of the study described in this paper, investigations concerning the application of artificial intelligence methods for the identification of the aforementioned characteristics were carried out. The methods in question were used to identify the maceral groups of coal, i.e. vitrinite, inertinite, and liptinite. Additionally, an attempt was made to identify some non-organic minerals. The analyses were performed using pattern recognition techniques (NN, kNN), as well as artificial neural network techniques (a multilayer perceptron - MLP). The classification process was carried out using microscopy images of polished sections of coals. A multidimensional feature space was defined, which made it possible to classify the discussed structures automatically, based on the methods of pattern recognition and algorithms of the artificial neural networks. Also, from the study we assessed the impact of the parameters for which the applied methods proved effective upon the final outcome of the classification procedure. The result of the analyses was a high percentage (over 97%) of correct classifications of maceral groups and mineral components. The paper discusses also an attempt to analyze particular macerals of the inertinite group. It was demonstrated that using artificial neural networks to this end makes it possible to classify the macerals properly in over 91% of cases. Thus, it was proved that artificial intelligence methods can be successfully applied for the identification of selected petrographic features of coal.

Relationships between coal-quality and organic-geochemical parameters: A case study of the Hafik coal deposits (Sivas Basin, Turkey)

Energy Technology Data Exchange (ETDEWEB)

Erik, N. Yalcin; Sancar, S. [Cumhuriyet University, Department of Geological Engineering, Sivas (Turkey)

2010-09-01

This study provides coal-quality, organic-petrographic and organic-geochemical data on Tertiary subbituminous coal of the Hafik area, northwestern part of the Sivas Basin, Turkey. Coal-petrological studies along with proximate and ultimate analyses were undertaken to determine the organic-petrographic characteristics of the Hafik coals. Huminite reflectances were found to be between 0.38 and 0.48% (corresponding to an organic-material-rich and coal layers), values characteristic of low maturity. This parameter shows a good correlation with calorific values (average 21,060 kJ/kg) and average T{sub max} (422 C) mineral-matter diagenesis, indicating immaturity. The studied coals and organic material underwent only low-grade transformation, a consequence of low lithostatic pressure. Therefore, the Hafik coals are actually subbituminous in rank. Rock-Eval analysis results show types II/III and III kerogens. The organic fraction of the coals is mostly comprised of humic-group macerals (gelinites), with small percentages derived from the inertinite and liptinite groups. In this study, organic-petrographic, organic-geochemical and coal quality data were compared. The Hafik deposit is a high-ash, high-sulfur coal. The mineral matter of the coals is comprised mainly of calcite and clay minerals. (author)

30 CFR 206.452 - Coal subject to royalties-general provisions.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Coal subject to royalties-general provisions... MINERALS REVENUE MANAGEMENT PRODUCT VALUATION Indian Coal § 206.452 Coal subject to royalties—general provisions. (a) All coal (except coal unavoidably lost as determined by BLM pursuant to 43 CFR group 3400...

30 CFR 206.253 - Coal subject to royalties-general provisions.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Coal subject to royalties-general provisions... MINERALS REVENUE MANAGEMENT PRODUCT VALUATION Federal Coal § 206.253 Coal subject to royalties—general provisions. (a) All coal (except coal unavoidably lost as determined by BLM under 43 CFR part 3400) from a...

Studies on the effect of coal particle size on biodepyritization of high sulfur coal in batch bioreactor

Directory of Open Access Journals (Sweden)

Singh Sradhanjali

2015-03-01

Full Text Available The moderate thermophilic mix culture bacteria were used to depyritize the Illinois coal of varying particle sizes (-100 μm, 100-200 μm, +200 μm. Mineral libration analysis showed the presence of pyrite along with other minerals in coal. Microbial depyritization of coal was carried out in stirred tank batch reactors in presence of an iron-free 9K medium. The results indicate that microbial depyritization of coal using moderate thermophiles is an efficient process. Moreover, particle size of coal is an important parameter which affects the efficiency of microbial depyritization process. At the end of the experiment, a maximum of 75% pyrite and 66% of pyritic sulphur were removed from the median particle size. The XRD analysis showed the absence of pyrite mineral in the treated coal sample. A good mass balance was also obtained with net loss of mass ranging from 5-9% showing the feasibility of the process for large scale applications.

Surface chemical problems in coal flotation

Science.gov (United States)

Taylor, S. R.; Miller, K. J.; Deurbrouck, A. W.

1981-02-01

As the use of coal increases and more fine material is produced by mining and processing, the need for improved methods of coal beneficiation increases. While flotation techniques can help meet these needs, the technique is beset with many problems. These problems involve surface chemical and interfacial properties of the coal-mineral-water slurry systems used in coal flotation. The problems associated with coal flotation include non-selectivity, inefficient reagent utilization, and excessive variablity of results. These problems can be broadely classified as a lack of predictability. The present knowledge of coal flotation is not sufficient, in terms of surface chemical parameters, to allow prediction of the flotation response of a given coal. In this paper, some of the surface chemical properties of coal and coal minerals that need to be defined will be discussed in terms of the problems noted above and their impact on coal cleaning.

Trace element affinities in two high-Ge coals from China

Energy Technology Data Exchange (ETDEWEB)

Jing Li; Xinguo Zhuang; Xavier Querol [China University of Geosciences, Wuhan (China). Faculty of Earth Resources

2011-01-15

The Lincang (Yunnan Province, Southwest China) and Wulantuga (Inner Mongolia, Northeast China) coal deposits are known because of the high-Ge content. These coals have also a high concentration of a number of other elements. To determine the mode of occurrence of the enriched elements in both coals, six density fractions from {lt} 1.43 to {gt} 2.8 g/cm{sup 3} were obtained from two representative samples using heavy-liquids. A number of peculiar geochemical patterns characterize these high-Ge coals. Thus, the results of the chemical analysis of these density fractions showed that both coals (very distant and of a different geological age) are highly enriched (compared with the usual worldwide coal concentration ranges) in Ge, As, Sb, W, Be, and Tl. This may be due to similar geochemistry of hydrothermal fluids influencing the Earth Crust in these regions of China. Moreover, Wulantuga coal (Early Cretaceous subbituminous coal) is also enriched in Ca, Mg, and Na, and Lincang coal (Neogene subbituminous coal) in K, Rb, Nb, Mo, Sn, Cs, and U. A group of elements consisting of Ge, W, B, Nb, and Sb mostly occur with an organic affinity in both coals. Additionally, Be, U, and Mo (and partially Mn and Zn) in Lincang, and Na and Mg in Wulantuga occur also with a major organic affinity. Both coals have sulfide-arsenide mineral assemblages (Fe, S, As, Sn, and Pb, and in addition to Tl, Ta, and Cs in the Lincang coal). The occurrence of Al, P, Li, Sc, Ti, V, Cr, and Zr in both coals, and Ba in Lincang, are associated with the mineral assemblage of silico-aluminates and minor heavy minerals. Furthermore, P, Na, Li, Sc, Ti, Ga, Rb, Zr, Cr, Ba, Th, and LREE (La, Ce, Pr, Nd, and Gd) in Lincang are associated with mineral assemblages of phosphates and minor heavy minerals. The two later mineral assemblages are derived from the occurrence of detrital minerals. 34 refs., 7 figs., 3 tabs.

Coal preparation

International Nuclear Information System (INIS)

Anon.

1991-01-01

The acid rain control legislation has prompted the Department of Energy (DOE) to seek new technology using the Clean Coal Technology program solicitation. The main goal of the program is to reduce SO 2 emissions below 9 Mt/a (10 million stpy) and NO x emission below 5.4 Mt/a (6 million stpy) by the year 2000. This would be accomplished by using precombustion, combustion, post combustion and conversion technology. Utilities are considering installing new scrubbers, switching fuel or possibly deep clean. However, the time required to implement the control technology is short. Due to the legislation, about 110 plants will have to adopt one of the approaches. This paper reports that in characterization of coal, Ames Laboratory used a scanning electron microscope- based, automated image analysis (SEM-AIA) technique to identify coal and mineral matter association. Various forms of organic sulfur were identified using peroxyacetic acid oxidation of coal. This was followed by subsequent microscopic, GC-MS, and HRMS analysis by Southern Illinois University. In ultrafine grinding of coal, it was reported by the Mining and Mineral Institute of Alabama that silica sand or flint shot used less energy compared to steel ball mills

[Changes in the blood concentrations of interleukins and electrolytes in miners working in deep coal mines].

Science.gov (United States)

Belkina, E B; Rebrov, B A; Rebrova, O A; Stroilo, N G; Voloshinovich, A R

2001-01-01

Miners working in deep coal mines, engaged in hard physical work under most harsh mine conditions demonstrate a striking imbalance between pro- and antiinflammatory cytokines and a rise in the blood levels of electrolytes K+ and Na+ as well. The analysis performed revealed a direct correlation between the level of blood concentration of IL-6 and that of K+, Na+.

Obtention and characterization of ceramic products with addition of the mineral coal bottom ashes from thermoelectric power plants

International Nuclear Information System (INIS)

Kniess, C.T.; Prates, P.B.; Brys, M.; Martins, G.J.; Riella, H.G.; Bernardin, A.

2011-01-01

The physical, chemical and mineralogical properties of mineral coal bottom ash derived from thermoelectric power plants are compatible with various raw materials used in ceramic industries, which indicates a possibility of partial or fully substitution of raw materials by this residue. This work intends to obtain and characterize ceramic products with additions of different percentages of bottom ash coal. For this, was used a commercial ceramic body (CI) made by an industry in the state of Santa Catarina. The formulations of the ceramics products were obtained by the mixture design (planning network Simplex). The byproduct of coal bottom ash was found to be an attractive raw material source of SiO_2 and Al_2O_3 to obtain ceramic materials. Was demonstrated the possibility of developing a ceramic materials classified as semi-porous (6 10) with additions of up to 20% of coal bottom ash in the composition of the ceramic body. (author)

Emphysema and pulmonary impairment in coal miners: Quantitative relationship with dust exposure and cigarette smoking

International Nuclear Information System (INIS)

Kuempel, E D; Vallyathan, V; Green, F H Y

2009-01-01

Coal miners have been shown to be at increased risk of developing chronic obstructive pulmonary diseases including emphysema. The objective of this study was to determine whether lifetime cumulative exposure to respirable coal mine dust is a significant predictor of developing emphysema at a clinically-relevant level of severity by the end of life, after controlling for cigarette smoking and other covariates. Clinically-relevant emphysema severity was determined from the association between individuals' lung function during life (forced expiratory volume in one second, FEV 1 , as a percentage of predicted normal values) and emphysema severity at autopsy (as the proportion of lung tissue affected). In a logistic regression model, cumulative exposure to respirable coal mine dust was a statistically significant predictor of developing clinically-relevant emphysema severity, among both ever-smokers and never-smokers. The odds ratio for developing emphysema associated with FEV 1 3 x yr) was 2.30 (1.46-3.64, 95% confidence limits), and at the cohort mean cigarette smoking (among smokers: 42 pack-years) was 1.95 (1.39-2.79).

[Correlative factors on prevalence rate of dislipidemia among 1 337 coal miners in Shanxi province].

Science.gov (United States)

Fu, Z D; Wen, D D; Wang, B; Xue, S L; Liu, G S; Li, X H; Zhao, Z H; Wang, J; Wei, B G; Wang, S P

2017-02-10

Objective: To understand the prevalence rate and correlative factors of dislipidemia among Shanxi coal miners and to provide evidence for the development of programs on dislipidemia prevention. Methods: We investigated 1 337 mine workers from a Coal Group in April 2016 and collected data related to their blood biochemistry. We then classified the types in accordance with the diagnostic criteria of " Guidelines for prevention and treatment of dyslipidemia in Chinese adults (2007)" , using χ (2) test and unconditional logistic regression model for analysis. Results: The overall prevalence rate of Dislipidemia was 59.1% (790/1 337), with males as 60.4% (708/1 173) and females as 50.0%(82/164) while males appeared higher ( χ (2)=6.386, P dislipidemia ( χ (2)=7.117, P dislipidemia ( P dislipidemia. Conclusion: Among the coal mine workers, those who were males, aged from 20 to 34, having high blood pressure (systolic blood pressure abnormalities) or with high BMI (≥24.0 kg/m(2)) need to be taken special attention on care and prevention of dislipidemia.

Magnetic resonance imaging for the wrist joint of the coal miners in vibration department

Energy Technology Data Exchange (ETDEWEB)

Zhao, X.Z.; Liu, R.L.; Hu, S.D.; Zhang, W.; Xu, W.X.; Ge, L.X. [Central Hospital of Zaozhuang Mine Corporation, Zaozhuang (China)

2006-04-15

To study the magnetic resonance imaging (MRI) in the wrist joint of coal miners who work in excavation and vibration department. Forty-three coal miners with the hand-arm vibration disease served as the observation group while 20 workers who were not working in the vibration department acted as the control group. The patients in the observation group were divided into five subgroups according to the time when they received vibration. The regularity of the development of signs and symptoms of MRI was observed and analyzed. The hydroarthrosis was most found in MRI. There were significant difference in hydroarthrosis osteoporosis and osteomyelitis between the observation group and the control group. The edema of bone marrow and the avascular necrosis of ossa carpi were found only in the observation group and not found in the control group. The hydroarthrosis and the edema of bone marrow occurred most in the early stage of vibration. The signal in the edema of the bone marrow of the distal end of the radius was decreased in the GE sequence with the specificity. Changes in the wrist joint occur in the early stage of the vibration work, and can be found in the MRI. The edema of the bone marrow of the distal end of the radius is of great value in the diagnosis of the hand-arm vibration disease.

Mitochondrial DNA copy number in peripheral blood cell and hypertension risk among mining workers: a case-control study in Chinese coal miners.

Science.gov (United States)

Lei, L; Guo, J; Shi, X; Zhang, G; Kang, H; Sun, C; Huang, J; Wang, T

2017-09-01

Alteration of mitochondrial DNA (mtDNA) copy number, which reflects oxidant-induced cell damage, has been observed in a wide range of human diseases. However, whether it correlates with hypertension has not been elucidated. We aimed to explore the association between mtDNA copy number and the risk of hypertension in Chinese coal miners. A case-control study was performed with 378 hypertension patients and 325 healthy controls in a large coal mining group located in North China. Face-to-face interviews were conducted by trained staffs with necessary medical knowledge. The mtDNA copy number was measured by a quantitative real-time PCR assay using DNA extracted from peripheral blood. No significant differences in mtDNA copy number were observed between hypertension patients and healthy controls. However, in both case and control groups, the mtDNA copy number was statistically significantly lower in the elder population (≥45 years old) compared with the younger subjects (associated with hypertension in coal miners.

Australian mineral industry annual review for 1986

Energy Technology Data Exchange (ETDEWEB)

1988-01-01

This volume of the Australian Mineral Industry Annual Review records the development and performance of the industry during the calendar year 1986. It reports production, consumption, treatment, trade, prices, new developments, exploration, and resources for mineral commodities including fuels, and summarises equivalent developments abroad. Part 1, 'General Review', after briefly surveying the world mineral industry, summarises developments in the Australian mineral industry as a whole. Part 2, 'Commodity Review', covers individual mineral commodities and commodity groups including brown coal, black coal and peat. Part 3, 'Mining Census', tabulates statistics extracted from the Mining Census, together with some mineral processing statistics from the Manufacturing Census. Part 4, tabulates quantity and value data on mineral output provided by the State departments of mines and their equivalents. The commodity review of black coal has been abstracted separately.

Forecasting safe duration of working time at coal face

Energy Technology Data Exchange (ETDEWEB)

Sukhanov, V V

1981-01-01

This paper discusses methods of evaluating pneumoconiosis hazard for coal miners, depending on factors which influence disease development. Some theories developed in the USSR, according to which the critical mass of coal dust in miner's lungs can amount to 20 g, are criticized. It is noted that this amount of dust causes an acute form of pneumoconiosis. Using regression analysis an equation was developed which describes dependence of pathologic changes in a miner's lung on the following factors: number of shifts characterized by contact with dust, dust concentration, volume of pulmonary ventilation in dust air (m3/min), miner's age, coal rank (described by volatile matter content), and a correction factor. On the basis of the described equation it has been calculated that a safe concentration of coal dust which practically excludes pneumoconiosis risk for a miner with 35 years of service ranges from 2 to 9 mg/m/sup 3/ for coals with volatile matter content from 2 to 44%.

Associations between occupational factors and occupational injury and the interplay of personal factors in Indian and French coal miners.

OpenAIRE

Bhattacherjee, A.; Kunar, BM.; Baumann, Michèle

2011-01-01

Research studies during the last decade have shown the roles of occupational and individual factors in occupational injury but a few information is available regarding their interplay. This study aimed at assessing the roles of occupational hazards and exploring their contributions to the occurrences of injuries among the Indian and French coal miners. In this study two surveys were conducted. The survey in India was a matched case-control study including 245 miners with an occupational injur...

Demographic variables in coal miners’ safety attitude

Science.gov (United States)

Yin, Wen-wen; Wu, Xiang; Ci, Hui-Peng; Qin, Shu-Qi; Liu, Jia-Long

2017-03-01

To change unsafe behavior through adjusting people’s safety attitudes has become an important measure to prevent accidents. Demographic variables, as influential factors of safety attitude, are fundamental and essential for the research. This research does a questionnaire survey among coal mine industry workers, and makes variance analysis and correlation analysis of the results in light of age, length of working years, educational level and experiences of accidents. The results show that the coal miners’ age, length of working years and accident experiences correlate lowly with safety attitudes, and those older coal miners with longer working years have better safety attitude, as coal miners without experiences of accident do.However, educational level has nothing to do with the safety attitude. Therefore, during the process of safety management, coal miners with different demographic characteristics should be put more attention to.

Women and men coal miners: coping with gender integration underground

Energy Technology Data Exchange (ETDEWEB)

Yount, K.R.

1986-01-01

The central purpose of this research is to initiate a theoretical understanding of the integration of women into traditionally-male, physical-labor jobs. The primary sources of data consist of in depth interviews with women and men underground coal miners and company personnel, and field notes collected during participant observation work in mining communities. Part I addresses the relationship between conditions of production and modes of interaction in underground mines. Personality traits conceived as aspects of masculinity are traced to efforts to cope with the stressors of engaging in physical labor in a work setting characterized by lack of work autonomy, a high degree of threat, and a high degree of interdependence for task accomplishment. Part II focuses on situational and individual factors affecting the integration of women in the workplace. Although most women miners are satisfied with their work, a gender based division of labor has arisen in which women are concentrated in low-prestige laborer positions. The processes involved in undermining a woman's work reputation and self-concept are summarized and forms of discrimination that recreate aspects of the female sterotype and lead to the development of sex segregation in the workplace are to the development of sex segregation in the workplace are discussed.

Automated mineralogical logging of coal and coal measure core

Energy Technology Data Exchange (ETDEWEB)

Stephen Fraser; Joan Esterle; Colin Ward; Ruth Henwood; Peter Mason; Jon Huntington; Phil Connor; Reneta Sliwa; Dave Coward; Lew Whitbourn [CSIRO Exploration & Mining (Australia)

2006-06-15

A mineralogical core logging system based on spectral reflectance (HyLogger{trademark}) has been used to detect and quantify mineralogies in coal and coal measure sediments. The HyLogger{trademark} system, as tested, operates in the visible-to-shortwave infrared spectral region, where iron oxides, sulphates, hydroxyl-bearing and carbonate minerals have characteristic spectral responses. Specialized software assists with mineral identification and data display. Three Phases of activity were undertaken. In Phase I, carbonates (siderite, ankerite, calcite) and clays (halloysite, dickite) were successfully detected and mapped in coal. Repeat measurements taken from one of the cores after three months demonstrated the reproducibility of the spectral approach, with some spectral differences being attributed to variations in moisture content and oxidation. Also, investigated was HyLogger{trademark} ability to create a 'brightness-profile' on coal materials, and these results were encouraging. In Phase II, geotechnically significant smectitic clays (montmorillonite) were detected and mapped in cores of clastic roof and floor materials. Such knowledge would be useful for mine planning and design purposes. In Phase III, our attempts at determining whether phosphorus-bearing minerals such as apatite could be spectrally detected were less than conclusive. A spectral index could only be created for apatite, and the relationships between the spectrally-derived apatite-index, the XRD results and the analytically-derived phosphorus measurements were ambiguous.

Coal beneficiation by gas agglomeration

Science.gov (United States)

Wheelock, Thomas D.; Meiyu, Shen

2003-10-14

Coal beneficiation is achieved by suspending coal fines in a colloidal suspension of microscopic gas bubbles in water under atmospheric conditions to form small agglomerates of the fines adhered by the gas bubbles. The agglomerates are separated, recovered and resuspended in water. Thereafter, the pressure on the suspension is increased above atmospheric to deagglomerate, since the gas bubbles are then re-dissolved in the water. During the deagglomeration step, the mineral matter is dispersed, and when the pressure is released, the coal portion of the deagglomerated gas-saturated water mixture reagglomerates, with the small bubbles now coming out of the solution. The reagglomerate can then be separated to provide purified coal fines without the mineral matter.

Environmental assessment and nano-mineralogical characterization of coal, overburden and sediment from Indian coal mining acid drainage

Directory of Open Access Journals (Sweden)

Madhulika Dutta

2017-11-01

Full Text Available The deterioration of environmental conditions is the major contributory factor to poor health and quality of life that hinders sustainable development in any region. Coal mining is one of the major industries that contribute to the economy of a country but it also impacts the environment. The chemical parameters of the coal, overburden, soil and sediments along with the coal mine drainage (CMD were investigated in order to understand the overall environmental impact from high sulphur coal mining at northeastern coalfield (India. It was found that the total sulphur content of the coal is noticeably high compared to the overburden (OB and soil. The volatile matter of the coal is sufficiently high against the high ash content of the soil and overburden. The water samples have a High Electrical Conductivity (EC and high Total Dissolve Solid (TDS. Lower values of pH, indicate the dissolution of minerals present in the coal as well as other minerals in the mine rejects/overburden. The chemical and nano-mineralogical composition of coal, soil and overburden samples was studied using a High Resolution-Transmission Electron Microscopy (HR-TEM, Energy Dispersive Spectroscopy (EDS, Selected-Area Diffraction (SAED, Field Emission-Scanning Electron Microscopy (FE-SEM/EDS, X-ray diffraction (XRD, Fourier Transform Infrared Spectroscopy (FTIR, Raman and Ion-Chromatographic analysis, and Mössbauer spectroscopy. From different geochemical analysis it has been found that the mine water sample from Ledo colliery has the lowest pH value of 3.30, Tirap colliery samples have the highest electrical conductivity value of 5.40 ms cm−1. Both Ledo and Tirap coals have total sulphur contents within the range 3–3.50%. The coal mine water from Tirap colliery (TW-15B has high values of Mg2+ (450 ppm, and Br− (227.17 ppm. XRD analysis revealed the presence of minerals including quartz and hematite in the coals. Mineral analysis of coal mine overburden (OB indicates

Investigation of virgin coals and coals subjected to a mild acid treatment

Energy Technology Data Exchange (ETDEWEB)

Clark, T.M.; Evans, B.J.; Wynter, C.; Pollak, H.; Taole, S.; Radcliffe, D. [University of Michigan, Ann Arbor, MI (United States). Dept. of Chemistry

1998-06-01

A quantitative determination of the relative marcasite/pyrite contents in virgin coals is possible by means of {sup 57}Fe Moessbauer spectroscopy. Complications arise however, when iron-containing silicates, carbonates, or other salts are present. The application of a mild chemical treatment involving hydrofluoric acid has been employed to remove these Fe-containing phases while leaving the iron-disulfide phases unaffected. Several South African coal samples with non-iron disulfide, Fe-containing phases ranging from 18 to 30 weight percent were subjected to a hydrofluoric acid leaching at room temperature. The loss of mineral matter with HF leaching correlates well with the mineral matter residue following low temperature ashing. The {sup 57}Fe Moessbauer spectra of the resulting coal samples indicate that only FeS{sub 2} phases are present and the absence of appreciable quantities of marcasite in the coals.

Mineral matter reactions in cokes

Energy Technology Data Exchange (ETDEWEB)

D. French; R. Sakurovs; M. Grigore [CSIRO Energy Technology (Australia)

2009-07-15

Some cokes appear to be particularly susceptible to weakening in the blast furnace. A mechanism which has been postulated to explain this is silica reduction by coke. Thus this project was initiated to ascertain the behaviour of quartz and silicates in coke with an emphasis on the role of the clay minerals. It is now possible to obtain quantitative mineralogical data and, the case of coal, to also obtain quantitative data on mineral grain size, shape and association through the use of automated electron beam image analysis techniques. This new ability can allow relationships between the amount of minerals in a coke and its reactivity to be established for the first time. Samples of five Australian coking coals were selected based upon quartz and clay mineral contents, mineral grain size and association. Samples were also provided by BlueScope Steel of coal, feed coke, and tuyere coke samples from the bosh, deadman and raceway regions of the blast furnace. The analytical work program conducted was as follows: Preparation of cokes by CSIRO; Petrography of starting coals and cokes; QEMSCAN of coals; LTA and XRD of starting coals and cokes; Coke reactivity tests (NSC and small scale); Petrography, LTA and XRD of reacted cokes; Petrographic and XRD examination of heat treated cokes. This study indicates that the NSC reactivity test does not adequately reflect the behaviour of coke in the lower part of the blast furnace. Further investigation of the behaviour of coke in the lower part of the blast furnace is required.

30 CFR 49.30 - Requirements for small coal mines.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Requirements for small coal mines. 49.30 Section 49.30 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR EDUCATION AND TRAINING MINE RESCUE TEAMS Mine Rescue Teams for Underground Coal Mines § 49.30 Requirements for small coal...

30 CFR 49.40 - Requirements for large coal mines.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Requirements for large coal mines. 49.40 Section 49.40 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR EDUCATION AND TRAINING MINE RESCUE TEAMS Mine Rescue Teams for Underground Coal Mines § 49.40 Requirements for large coal...

78 FR 26638 - Non-Competitive One-Year Extension With Funds for Black Lung/Coal Miner Clinics Program (H37...

Science.gov (United States)

2013-05-07

... DEPARTMENT OF HEALTH AND HUMAN SERVICES Health Resources and Services Administration Non-Competitive One-Year Extension With Funds for Black Lung/Coal Miner Clinics Program (H37) Current Grantee..., 2013), announcing the issuing of a non-competitive one-year extension with funds for the Black Lung...

Dermatoses of Belchatow brown coal mine employees

Energy Technology Data Exchange (ETDEWEB)

Ruszczak, Z.; Bienias, L.; Proszczynska-Kuczynska, W.

1981-09-01

Evaluates the results of examinations carried out in the Belchatow brown coal surface mine on skin diseases. Influence of working conditions specific for brown coal mines on the development of some dermatoses is analyzed. From 1978 to 1979 443 miners were examined. Two groups of miners were examined separately: 1. 235 miners who contacted the firm physician due to skin problems and 2. 208 miners who underwent a periodic examination. In group 1 skin dermatoses were found in 86% of all cases, and in group 2 in 48%. Foot skin inflammation, particularly interdigital intertrigo, was the most common dermatosis. Oil acne (occupational disease of coal miners) was diagnosed in 15 cases, common acne in 23 cases, pytiriasis versicolor in 19 cases, erythrasma in 10, eczema and other contact dermatitis in 10 cases. Investigations show that 23% of the foot interdigital intertrigo is caused by mycotic infections. Dermatoses of the skin of miners' feet are caused mainly by rubber protective boots. (10 refs.) (In Polish)

Dermatoses of Belchatow brown coal mine employees

Energy Technology Data Exchange (ETDEWEB)

Ruszczak, Z; Bienias, L; Proszczynska-Kuczynska, W

1981-09-01

Evaluates the results of examinations carried out in the Belchatow brown coal surface mine on skin diseases. Influence of working conditions specific for brown coal mines on the development of some dermatoses is analyzed. From 1978 to 1979 443 miners were examined. Two groups of miners were examined separately: 1. 235 miners who contacted the firm physician due to skin problems and 2. 208 miners who underwent a periodic examination. In group 1 skin dermatoses were found in 86% of all cases, and in group 2 in 48%. Foot skin inflammation, particularly interdigital intertrigo, was the most common dermatosis. Oil acne (occupational disease of coal miners) was diagnosed in 15 cases, common acne in 23 cases, pytiriasis versicolor in 19 cases, erythrasma in 10, eczema and other contact dermatitis in 10 cases. Investigations show that 23% of the foot interdigital intertrigo is caused by mycotic infections. Dermatoses of the skin of miners' feet are caused mainly by rubber protective boots. (10 refs.) (In Polish)

Taxation of unmined minerals

International Nuclear Information System (INIS)

Bremberg, B.P.

1989-01-01

This paper reports on the Kentucky Revenue Cabinet which began implementing its controversial unmined minerals tax program. The Revenue Cabinet should complete its first annual assessment under this program in December, 1989. The Revenue Cabinet's initial efforts to collect basic data concerning the Commonwealth's coal bearing lands has yielded data coverage for 5 million of Kentucky's 10 million acres of coal lands. Approximately 1000 detailed information returns have been filed. The returns will be used to help create an undeveloped mineral reserves inventory, determine mineral ownership, and value mineral reserves. This new program is run by the Revenue Cabinet's Mineral Valuation Section, under the Division of Technical Support, Department of Property Taxation. It has been in business since September of 1988

Concerning coal: an anthology

Energy Technology Data Exchange (ETDEWEB)

Mayer, M.; Hawse, M.L.; Maloney, P.J. [eds.

1997-12-31

The anthology takes a humanistic look at coal mining in Illinois. One of its goals is to increase public awareness of coal in American society; it also seeks to enhance understanding of the historical aspects of coal and to study the impact of coal on mining families. Many of the 25 selections in the anthology come from Coal Research Center publications, `Concerning coal` and `Mineral matters`. Articles are arranged in three parts entitled: life in the mining community; mining in folklore, story telling, literature, art and music; and technology as it affected the people of the coal fields. 117 refs., 25 photos. 1 map.

Microscopic coal research in Canada

NARCIS (Netherlands)

Hacquebard, P.A.

1955-01-01

Since the industrial developments of Europe and North America in the nineteenth century, coal has been considered as the most important mineral wealth a country could possess. Coal was often referred to as King Coal, and it was not until around 1950 that its position as the major fuel for modern

Mineralogic and element association of coals from the Gevra mine, Korba coal field, Madhya Pradesh, India

International Nuclear Information System (INIS)

Hart, B.R.; Powell, M.A.; Fyfe, W.S.; Sahu, K.C.; Tripathy, S.

1991-01-01

As a part of a project to study the content and distribution of trace elements in coals and coal by-products from coal mining areas of India, the mineral and elemental composition of the whole coal and concentration of the selective elements in the whole coal mined from the Gevra mine of the Korba coal field in Madhya Pradesh are studied. The vertical trend of the selected elements are defined and possible relationships of these elements to the minerals present in or associated with the above coal are examined. The Gevra Coals have ash contact ( 3 times world average) and low sulphur content (1/4 of world average). Most elements are found to be positively correlated with ash indicating an inorganic association. Elements which show organic affinity include S, Cl, I and In. Fe, Cu, Zn and Pb occur in sulfide phases, the dominant Fe phase identified is siderite which also contain Mn and Mg. Th and U along with varying proportions of rare earths, Ce, Dy, La and Y have been identified with discrete phosphate minerals. Most trace elements have been found to be concentrated in the upper and lower portions of the coal seam exposed in Gevra mine and in partings. It is, therefore, suggested that selective mining and removal of high ash/inorganic material, particularly the upper and lower portion of the seam, will greatly reduce the mobilization of Al, As, Co, Fe, Hf, Sc, Si, Ti and to a lesser degree Cr, La, Mn, Th U and V during combustion of coal in power plants and consequently will reduce the influx of trace elements to the environment. (M.G.B.). 23 refs., 5 figs

Properties of sorbents from brown coal

Energy Technology Data Exchange (ETDEWEB)

Straka, P.; Buchtele, J. [Academy of Sciences of the Czech Republic, Prague (Czech Republic)

2000-07-01

The surface and sorptional properties of carbonaceous materials prepared from brown coal and their relation to minerals content and coal bulk density as technologically important parameters of starting coal were described. Chars were prepared from brown coal of North Bohemian Brown Coal District and activated with CO{sub 2} in a large-scale laboratory unit. Their surface and sorptive properties were investigated. It was found that mineral matter/ash content favourably affects the mesoporosity development in chars/activated chars as the sorption capacity increased with increasing ash content in chars. No influence of ash content on the macroporosity was observed. With the activated chars, both the inner surface and sorption capacity showed the maximum in the burn-off range of 41-64%. Optimization of the process is discussed.

Effect of coal rank and mineral matter on gasification reactivity of coal char treated at high temperature; Netsushorishita sekitan char no gas ka tokusei ni taisuru tanshu oyobi kobutsushitsu no eikyo

Energy Technology Data Exchange (ETDEWEB)

Morishita, K.; Takei, H.; Harano, A.; Takarada, T. [Gunma University, Gunma (Japan). Faculty of Engineering

1996-10-28

In the wide range from brown coal to anthracite, an investigation was made of effects of heat treatment on physical/chemical properties and of coal rank dependence. For the experiment, 12 kinds of coal samples were used, and for heat treatment, the fluidized bed heated by the electric furnace and the infrared-ray gold image furnace were used. To examine characteristics of the heat-treated coal char, conducted were oxygen gasification, TPD measurement, XRD measurement, alkali metal measurement, and pore distribution measurement. The following were obtained from the experiment. The gasification reaction rate of the char heat-treated in the temperature range between 900{degree}C to 1700{degree}C decreases with a rise of the temperature of heat treatment, and the degree of decrease in the rate depends on coal rank. The order of gasification rate between coal ranks depends on the temperature of heat treatment, and the lower the heat treatment temperature is, the more largely the gasification rate is influenced by catalysis of mineral matters included in the coal. As causes of the decrease in gasification rate associated with the rise in temperature of heat treatment, indicated were release of alkali metal having catalysis and decrease of active sites by carbonaceous crystallinity. 6 figs.

Environmental problems in Russian coal industry

International Nuclear Information System (INIS)

Kharchenko, V.; Oumnov, V.

1996-01-01

The state of the Russian coal industry is complicated both economically and environmentally. Most mines are unprofitable. Several coal mines are intended to be closed. So, under existing conditions, coal mines are unable to give much attention to environmental protection problems. At the same time, coal mining is one of the most polluting industries. The main trends in this industry's negative influence upon the environment are: land spoilage and immobilization to lay out open-pit mines and mineral waste dump areas and tailing piles as well as with industrial waste water runoff; atmospheric pollution with the air coming from underground and substances blown off from dumps, hydrogeological regime intervention in coal mining areas, etc. One way to solve environmental problems in coal mining is a more rational utilization of the accompanying natural coal resources. Such measures make it possible to obtain complementary profits not only at the expense of reducing environmental destruction but producing new kinds of goods or services as well. Examples of similar solutions are solid mineral wastes utilization, underground space utilization, coal gas utilization and other issues

30 CFR 772.13 - Coal exploration compliance duties.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal exploration compliance duties. 772.13... INTERIOR SURFACE COAL MINING AND RECLAMATION OPERATIONS PERMITS AND COAL EXPLORATION SYSTEMS UNDER REGULATORY PROGRAMS REQUIREMENTS FOR COAL EXPLORATION § 772.13 Coal exploration compliance duties. (a) All...

Lung disease and coal mining: what pulmonologists need to know.

Science.gov (United States)

Go, Leonard H T; Krefft, Silpa D; Cohen, Robert A; Rose, Cecile S

2016-03-01

Coal mine workers are at risk for a range of chronic respiratory diseases including coal workers' pneumoconiosis, diffuse dust-related fibrosis, and chronic obstructive pulmonary disease. The purpose of this review is to describe coal mining processes and associated exposures to inform the diagnostic evaluation of miners with respiratory symptoms. Although rates of coal workers' pneumoconiosis declined after regulations were enacted in the 1970s, more recent data shows a reversal in this downward trend. Rapidly progressive pneumoconiosis with progressive massive fibrosis (complicated coal workers' pneumoconiosis) is being observed with increased frequency in United States coal miners, with histologic findings of silicosis and mixed-dust pneumoconiosis. There is increasing evidence of decline in lung function in individuals with pneumoconiosis. Multiple recent cohort studies suggest increased risk of lung cancer in coal miners. A detailed understanding of coal mining methods and processes allows clinicians to better evaluate and confirm chronic lung diseases caused by inhalational hazards in the mine atmosphere.

Variations in pore characteristics in high volatile bituminous coals: Implications for coal bed gas content

Science.gov (United States)

Mastalerz, Maria; Drobniak, A.; Strapoc, D.; Solano-Acosta, W.; Rupp, J.

2008-01-01

The Seelyville Coal Member of the Linton Formation (Pennsylvanian) in Indiana was studied to: 1) understand variations in pore characteristics within a coal seam at a single location and compare these variations with changes occurring between the same coal at different locations, 2) elaborate on the influence of mineral-matter and maceral composition on mesopore and micropore characteristics, and 3) discuss implications of these variations for coal bed gas content. The coal is high volatile bituminous rank with R0 ranging from 0.57% to 0.60%. BET specific surface areas (determined by nitrogen adsorption) of the coals samples studied range from 1.8 to 22.9??m2/g, BJH adsorption mesopore volumes from 0.0041 to 0.0339??cm3/g, and micropore volumes (determined by carbon dioxide adsorption) from 0.0315 to 0.0540??cm3/g. The coals that had the largest specific surface areas and largest mesopore volumes occur at the shallowest depths, whereas the smallest values for these two parameters occur in the deepest coals. Micropore volumes, in contrast, are not depth-dependent. In the coal samples examined for this study, mineral-matter content influenced both specific surface area as well as mesopore and micropore volumes. It is especially clear in the case of micropores, where an increase in mineral-matter content parallels the decrease of micropore volume of the coal. No obvious relationships were observed between the total vitrinite content and pore characteristics but, after splitting vitrinite into individual macerals, we see that collotelinite influences both meso- and micropore volume positively, whereas collodetrinite contributes to the reduction of mesopore and micropore volumes. There are large variations in gas content within a single coal at a single location. Because of this variability, the entire thickness of the coal must be desorbed in order to determine gas content reliably and to accurately calculate the level of gas saturation. ?? 2008 Elsevier B.V. All

Nano-mineralogical investigation of coal and fly ashes from coal-based captive power plant (India): An introduction of occupational health hazards

International Nuclear Information System (INIS)

Oliveira, Marcos L.S.; Marostega, Fabiane; Taffarel, Silvio R.; Saikia, Binoy K.; Waanders, Frans B.; DaBoit, Kátia; Baruah, Bimala P.

2014-01-01

Coal derived nano-particles has been received much concern recently around the world for their adverse effects on human health and the environment during their utilization. In this investigation the mineral matter present in some industrially important Indian coals and their ash samples are addressed. Coal and fly ash samples from the coal-based captive power plant in Meghalaya (India) were collected for different characterization and nano-mineralogy studies. An integrated application of advanced characterization techniques such as X-ray diffraction (XRD), High Resolution-Transmission Electron microscopy (HR-TEM)/(Energy Dispersive Spectroscopy) EDS/(selected-area diffraction pattern) SAED, Field Emission-Scanning Electron Microscopy (FE-SEM)/EDS analysis, and Mössbauer spectroscopy were used to know their extent of risks to the human health when present in coal and fly ash. The study has revealed that the coals contain mainly clay minerals, whilst glass fragments, spinel, quartz, and other minerals in lesser quantities were found to be present in the coal fly ash. Fly ash carbons were present as chars. Indian coal fly ash also found to contain nanominerals and ultrafine particles. The coal-fired power plants are observed to be the largest anthropogenic source of Hg emitted to the atmosphere and expected to increase its production in near future years. The Multi Walled Carbon Nano-Tubes (MWCNTs) are detected in our fly ashes, which contains residual carbonaceous matter responsible for the Hg capture/encapsulation. This detailed investigation on the inter-relationship between the minerals present in the samples and their ash components will also be useful for fulfilling the clean coal technology principles. - Highlights: • We research changes in the level of ultrafine and nanoparticles about coal–ash quality. • Increasing dates will increase human health quality in this Indian coal area. • Welfare effects depend on ex-ante or ex-post assumptions about

Investigation of a separation process involving liquid-water-coal systems

Energy Technology Data Exchange (ETDEWEB)

Keller, Jr, D V; Burry, W

1987-01-01

A liquid-liquid-solid separation procedure wherein a water-oil-coal-mineral matter slurry is allowed to come to equilibrium through mechanical agitation has for many years been applied to the separation of coal from mineral matter. The product is a black cottage cheese-like mass of agglomerated coal particles and oil suspended in the excess water which supports the dispersed mineral matter particles. A liquid bridge model which was proposed by earlier investigators is reviewed critically and used to estimate the free energy per unit area of the separation of coals of different ranks. Observations of the kinetics of the process suggest that the simple liquid bridge model is insufficient, probably due to the heterogeneous surfaces of the coal. An alternative model is proposed. 14 references.

Coal and recycling mark the way forward

Energy Technology Data Exchange (ETDEWEB)

Bignell, E.

2000-11-01

A report is given of this year's Mineral Engineering Society's annual conference held in Scarborough, UK. The themes of recycling and coal were chosen for the two days of technical presentations. Topics included the cleaning up of brown field sites; the use of recycled waste oxide to replace iron ore pellets for cooling furnaces in steel making; high pressure filtration of industrial mineral effluent; iron ore mining in Australia; screen development; the status of coal preparation technology, by RJB Mining; study of movement of material (to simulate coal) in a hopper; and a UK-Chinese project on reduction of sulphur in coal.

The Video Collaborative Localization of a Miner's Lamp Based on Wireless Multimedia Sensor Networks for Underground Coal Mines.

Science.gov (United States)

You, Kaiming; Yang, Wei; Han, Ruisong

2015-09-29

Based on wireless multimedia sensor networks (WMSNs) deployed in an underground coal mine, a miner's lamp video collaborative localization algorithm was proposed to locate miners in the scene of insufficient illumination and bifurcated structures of underground tunnels. In bifurcation area, several camera nodes are deployed along the longitudinal direction of tunnels, forming a collaborative cluster in wireless way to monitor and locate miners in underground tunnels. Cap-lamps are regarded as the feature of miners in the scene of insufficient illumination of underground tunnels, which means that miners can be identified by detecting their cap-lamps. A miner's lamp will project mapping points on the imaging plane of collaborative cameras and the coordinates of mapping points are calculated by collaborative cameras. Then, multiple straight lines between the positions of collaborative cameras and their corresponding mapping points are established. To find the three-dimension (3D) coordinate location of the miner's lamp a least square method is proposed to get the optimal intersection of the multiple straight lines. Tests were carried out both in a corridor and a realistic scenario of underground tunnel, which show that the proposed miner's lamp video collaborative localization algorithm has good effectiveness, robustness and localization accuracy in real world conditions of underground tunnels.

Yoga-based pulmonary rehabilitation for the management of dyspnea in coal miners with chronic obstructive pulmonary disease: A randomized controlled trial

Directory of Open Access Journals (Sweden)

Rajashree Ranjita

2016-07-01

Conclusions: Findings indicate that IAYT benefits coal miners with COPD, reducing dyspnea; fatigue and PR, and improving functional performance and peripheral capillary SpO2%. Yoga can now be included as an adjunct to conventional therapy for pulmonary rehabilitation programs for COPD patients.

Mineral industry in Australia

International Nuclear Information System (INIS)

Parbo, S.A.

1982-01-01

The paper reviews the history and growth of the mineral industry in Australia and its significance to the nation's economic growth and overseas trade, particularly over the last twenty years during which time production of coal, iron ore, manganese and mineral sands has increased greatly and new discoveries of petroleum, bauxite and nickel have given rise to major new industries. Australia ranks fourteenths in the value of world trade and is among the world's largest exporters of alumina, iron ore, mineral sands, coal, lead, zinc and nickel. Some details of production, processing and exports of the major minerals are given. Comment is made on the policies and roles of the six State Governments and the Federal Government in respect of ownership and control of the mining, processing and exporting of both energy and non-energy minerals. (orig.) [de

30 CFR 210.205 - What reports must I submit to claim allowances on Indian coal leases?

Science.gov (United States)

2010-07-01

... on Indian coal leases? 210.205 Section 210.205 Mineral Resources MINERALS MANAGEMENT SERVICE... Minerals § 210.205 What reports must I submit to claim allowances on Indian coal leases? General. You must... coal leases: (1) Form MMS-4292, Coal Washing Allowance Report, to claim an allowance for the reasonable...

Database on nuclide content of coal and gangue in Chinese coal mines

International Nuclear Information System (INIS)

Liu Fudong; Liao Haitao; Wang Chunhong; Chen Ling; Liu Senlin

2006-01-01

The designing ides, structure, interface and basic function of a database are introduced of nuclide content of coal or gangue in Chinese coal mine. The design of the database adopts Sybase database system, and the database has the functions of making inquiries of keyword, classification and statistics, printing, data input which are achieved by using Power builder Language program. At the present, in this database, the data are collected on the radioactivity of natural radionuclide of 2043 coal, gangue and the other relative samples from various coal miners of all over the country. The database will provide the basic data for the environmental impact assessment of Chinese coal energy. (authors)

Methods of medical prevention of borderline states and maintaining capacity to work in miners at deep coal mines

Energy Technology Data Exchange (ETDEWEB)

Kobets, G.P.; Perederii, G.S.; Tkachenko, L.N.; Ivanov, V.V.; Kiva, A.I. (Institut Gigieny Truda i Profzabolevanii, Donetsk (USSR))

1990-01-01

Describes the procedures used to identify and treat borderline states in coal miners working in deep mines in the Donbass. Timely preventive treatment helps to maintain the condition of the miners and reduce time lost through sickness. Diagnosis is performed on the basis of a number of physical indices coupled with a subjective assessment marked on a points scale. The types of treatment available at sanatoria are outlined: they include physiotherapy, mud and carbon dioxide baths, various types of massage, etc. Courses last 2-3 weeks and are followed by 3-8 days of rehabilitation at work, depending on occupation and working conditions. 6 refs.

30 CFR 206.459 - Allocation of washed coal.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Allocation of washed coal. 206.459 Section 206... MANAGEMENT PRODUCT VALUATION Indian Coal § 206.459 Allocation of washed coal. (a) When coal is subjected to washing, the washed coal must be allocated to the leases from which it was extracted. (b) When the net...

30 CFR 206.260 - Allocation of washed coal.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Allocation of washed coal. 206.260 Section 206... MANAGEMENT PRODUCT VALUATION Federal Coal § 206.260 Allocation of washed coal. (a) When coal is subjected to washing, the washed coal must be allocated to the leases from which it was extracted. (b) When the net...

EFFECTS OF THE APPLICATION OF A MINERAL-AND-ORGANIC FERTILISER PRODUCED FROM BROWN COAL ON THE OCCURRENCE AND INFECTIOUS POTENTIAL OF ENTOMOPATHOGENIC FUNGI IN SOIL

Directory of Open Access Journals (Sweden)

Anna Majchrowska-Safaryan

2017-05-01

Full Text Available This study compared the species composition and rate of entomopathogenic fungi occurrence in cultivable soil following the application of a mineral-and-organic fertiliser produced from brown coal. The material for testing consisted of soil samples collected in the second year of the experiment on two dates in 2015 (spring and autumn. The experiment was carried out on the following plots: control plot (no fertilisation; a plot fertilised with mineral fertilisers NPK presowing + N60 for top dressing; a plot fertilised with NPK presowing + manure; a plot fertilised with a fertiliser produced from brown coal at a dose of 1 t/ha NPK presowing + N20 for top dressing; and a plot fertilised with a fertiliser produced from brown coal at a dose of 5 t/ha NPK presowing + N40 for top dressing. Entomopathogenic fungi were isolated from soil of particular fertilisation experiment plots using insect traps (Galleria mellonella larvae as well as a selective medium. Three species of entomopathogenic fungi, i.e. Beauveria bassiana, Metarhizium anisopliae s.l. and Isaria fumosorosea, were isolated using two methods, from the soil samples collected from particular fertilisation experiment plots on two dates, i.e. spring and autumn. Fungus M. anisopliae s.l. proved to be the predominant species in the tested soil samples. The addition of the mineral-and-organic fertiliser, produced based on brown coal, to the soil at both applied doses contributed to an increase in the number of infectious units (CFUs of entomopathogenic fungi formed in relation to the control plot.

Buckets of money for coal

International Nuclear Information System (INIS)

Anon

2001-01-01

The revival of coal prices is providing record profits for Australian coal producers. As the world's largest coal exporter, any move in coal prices has significant ramifications for the Australian economy. The coal boom of the mid-1980s resulted in a massive increase in mine capacity and subsequently excess supply. This resulted in the decade between 1990 and 2000 seeing benchmark prices for coking coal in Japan plummeting to $US 39 a tonne (down from around the $US 52 mark) and a price of $US 28 for a tonne of steaming coal. Asia's financial problems, late in the decade coupled with a rapid fall in Asian steel making, also added to our coal export woes. As a result for most of the 1990s, Australia's coal sector delivered inadequate returns, was seen as over-capitalised and suffered from a profound investor indifference. But the sector is now seeing a definite turnaround in fortunes. Prices for thermal coal are on the rise and the benchmark coking coal prices to Asia have also jumped. Market analysts reported the price for contract deliveries of thermal coal in April this year were $US 34.50 ($AUD 69.35) up by $US 5.75 from the same time last year. The increased production is expected on the back of a continued rise in export demand, further improvement in prices, significant improvements in mine productivity, a weak Australian dollar and the probability of new projects and mine extensions going into operation. The improved returns have also flowed into rising valuations for listed coal miners. Over the last year, coal miners such as MIM and Gympie Gold, have delighted in share price gains of 12 per cent and 55 per cent respectively. These sort of performances are being repeated across the Australian industry

What differences does age make? Coal mining injuries

Energy Technology Data Exchange (ETDEWEB)

Mallett, L.; Schwerha, D.J. [National Institute for Occupational Safety and Health, Pittsburgh, PA (United States). Research Laboratory

2007-02-15

The US Bureau of Labor Statistics says that in 2002 the coal mine workforce in the USA had a higher medium age than the workforce in any other sector of mining. Many older miners are part of the generation group known as Baby Boomers. The article gives figures for injuries received in underground coal mining, surface coal mining and coal preparation plant workers, analysed by age groups (Nexters, {lt}22; Generation Xers, 22-41; Baby Boomers, 42-59; Veterans, 60 and above), and also by job title. In all generation groups, more injuries were recorded in miners with less than two years experience. 4 refs., 3 tabs., 6 charts.

Coal petrology of coal seams from the Leao-Butia Coalfield, Lower Permian of the Parana Basin, Brazil - Implications for coal facies interpretations

Energy Technology Data Exchange (ETDEWEB)

Silva, M.B. [Laboratorio de Oceanografia Geologica, Departamento de Geociencias, Fundacao Universidade Federal do Rio Grande, FURG, Av. Italia km 08, Campus Carreiros, 96201-900, Rio Grande, RS (Brazil); Kalkreuth, W.; Holz, M. [Instituto de Geociencias, UFRGS, Av. Bento Goncalves, 9500 91501-970 Porto Alegre, RS (Brazil)

2008-02-01

In the Leao-Butia Coalfield, Rio Grande do Sul the coal seams occur in the Rio Bonito Formation, Guata Group, Tubarao Supergroup of the Parana Basin, Brazil and are of Permian (Artinskian-Kungurian) age. This study is the first detailed investigation on the coal petrographic characterization of the coal-bearing sequence in relation to the depositional settings of the precursor mires, both in terms of whole seam characterization and in-seam variations. The study is based on the analyses of nine coal seams (I2, CI, L4, L3, L2, L1, S3, S2, S1), which were selected from core of borehole D-193, Leao-Butia and represent the entire coal-bearing sequence. The interpretation of coal facies and depositional environment is based on lithotype, maceral and microlithotype analyses using different facies-critical petrographic indices, which were displayed in coal facies diagrams. The seams are characterized by the predominance of dull lithotypes (dull, banded dull). The dullness of the coal is attributed to relatively high mineral matter, inertinite and liptinite contents. The petrographic composition is dominated by vitrinite (28-70 vol.% mmf) and inertinite (> 30 vol.% mmf) groups. Liptinite contents range from 7 to 30 vol.% (mmf) and mineral matter from 4-30 vol.%. Microlithotypes associations are dominated by vitrite, duroclarite, carbominerite and inertite. It is suggested that the observed vertical variations in petrographic characteristics (lithotypes, microlithotypes, macerals, vitrinite reflectance) were controlled by groundwater level fluctuations in the ancient mires due to different accommodation/peat accumulation rates. Correlation of the borehole strata with the general sequence-stratigraphical setting suggests that the alluvial fan system and the coal-bearing mudstone succession are linked to a late transgressive systems tract of sequence 2. Based on average compositional values obtained from coal facies diagrams, a deposition in a limno-telmatic to limnic coal

Characterization of coal types by their content of volatile matter

Energy Technology Data Exchange (ETDEWEB)

Scholz, A. (Ruhrkohle A.G., Essen (Germany, F.R.). Qualitaetsstelle)

1979-08-01

First of all, the difference between mineral content and ash content, the effect of minerals on the content of volatile matter and the connection between the ash and volatile matter contents is examined. Then three processes are described, to determine the content of organic fuels in the volatile matter of hard coal. The results are compared and the applicability of the processes is assessed. The conversion formulae recommended for the ASTM and NCB classifications are examined regarding their applicability to German types of coal. Finally an equation is proposed, in order to calculate the estimated value for the content of water and mineral free fuel in volatile matter. Apart from the content of volatile matter in water free coal, one only needs the figures ash content and the mineral factor for this. The equation can also be used for mixtures the usability of the equation is tested for Ruhr coal.

Trace element geochemistry and mineralogy of coal from Samaleswari open cast coal block (S-OCB), Eastern India

Science.gov (United States)

Saha, Debasree; Chatterjee, Debashis; Chakravarty, Sanchita; Mazumder, Madhurina

2018-04-01

Coal samples of Samaleswari open cast coal block (S-OCB) are high ash (Aad, mean value 35.43%) and low sulphur content (St, on dry basis, mean value 0.91% analysis. The work is further supported by the use of chemical fractionation experiment that reveals the multi mode of occurrence of several environmentally concern and interested trace elements (Sb, As, Be, Cd, Cr, Co, Cu, Pb, Mn, Ni, Zn). Among the analysed trace elements Co, Mn and Zn have major silicate association along with significant carbonate/oxide/monosulfide association. Whereas As, Cd, Cu, Pb and Ni have dominant pyritic association with notable silicate and carbonate/oxide/monosulfide association. The rest three elements (Sb, Be, Cr) have principally organic association with minor silicate and carbonate/oxide/monosulfide association. The stratigraphic variation of organo-mineral matrix content and detrital-authigenic mineral ratio are primarily related to coal rank. Geochemical character of coal also reflects a light towards proper utilisation of S-OCB coal from technical and environmental view point.

Process for agglomerating fine coal

Energy Technology Data Exchange (ETDEWEB)

Austin, L J; Misbach, P

1976-06-24

The invention concerns a process for agglomerating black coal in mud or powder form in the presence of a mineral oil product dispersed in water. During this process, the nutty slack is added to a portion - approximately 5 - 15% of its weight in the case of anhydrous coal - of a bitumen emulsion and thoroughly mixed. The emulsion should contain mineral oil bitumen with a penetration value 25/sup 0/ less than 5, or a Conradson value of over 35. In a further finishing process the emulsion contains alkaline naphthenate.

30 CFR 716.5 - Anthracite coal mines.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Anthracite coal mines. 716.5 Section 716.5... PROGRAM REGULATIONS SPECIAL PERFORMANCE STANDARDS § 716.5 Anthracite coal mines. (a) Permittees of anthracite surface coal mining and reclamation operations in those States where the mines are regulated by...

30 CFR 206.265 - Value enhancement of marketable coal.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Value enhancement of marketable coal. 206.265... MANAGEMENT PRODUCT VALUATION Federal Coal § 206.265 Value enhancement of marketable coal. If, prior to use, sale, or other disposition, the lessee enhances the value of coal after the coal has been placed in...

30 CFR 206.464 - Value enhancement of marketable coal.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 2 2010-07-01 2010-07-01 false Value enhancement of marketable coal. 206.464... MANAGEMENT PRODUCT VALUATION Indian Coal § 206.464 Value enhancement of marketable coal. If, prior to use, sale, or other disposition, the lessee enhances the value of coal after the coal has been placed in...

Moessbauer and XRD Characterization of the Mineral Matter of Coal from the Guachinte Mine in Colombia

International Nuclear Information System (INIS)

Reyes, F.; Perez Alcazar, G. A.; Barraza, J. M.; Bohorquez, A.; Tabares, J. A.; Speziali, N. L.

2003-01-01

The aim of this work was the characterization and differentiation, using Moessbauer spectroscopy (MS) and X-ray diffraction (XRD), of coal samples with different ash and sulfur contents obtained in three places corresponding at cuts in different seams from the Guachinte mine, Valle, Colombia. The mineral phases identified by XRD were in general kaolinite, quartz, pyrite and gypsum, and in particular dolomite and calcite. MS confirms the presence of pyrite and kaolinite, besides evidences the additional presence of jarosite which was not detected by the XRD results due their low amounts. In the high mineral matter ash sample quartz and hematite was identified by XRD, the last one confirmed by MS results. A second phase in this sample was detected by Moessbauer spectroscopy, which could be superparamagnetic hematite. Rietveld refinement for XRD pattern from a sample is reported.

Trace element geochemistry of self-burning and weathering of a mineralized coal waste dump: The Novátor mine, Czech Republic

Czech Academy of Sciences Publication Activity Database

Kříbek, B.; Sýkorová, Ivana; Veselovský, F.; Laufek, F.; Malec, J.; Knésl, I.; Majer, V.

2017-01-01

Roč. 173, MAR 15 (2017), s. 158-175 ISSN 0166-5162 R&D Projects: GA ČR(CZ) GA15-11674S Institutional support: RVO:67985891 Keywords : coal wastes * organic matter * uranium * mineralization * self-heating * biomarkers Subject RIV: DD - Geochemistry OBOR OECD: Geology Impact factor: 4.783, year: 2016

The Transformation of Coal-Mining Waste Minerals in the Pozzolanic Reactions of Cements

Directory of Open Access Journals (Sweden)

Rosario Giménez-García

2016-06-01

Full Text Available The cement industry has the potential to become a major consumer of recycled waste materials that are transformed and recycled in various forms as aggregates and pozzolanic materials. These recycled waste materials would otherwise have been dumped in landfill sites, leaving hazardous elements to break down and contaminate the environment. There are several approaches for the reuse of these waste products, especially in relation to clay minerals that can induce pozzolanic reactions of special interest in the cement industry. In the present paper, scientific aspects are discussed in relation to several inert coal-mining wastes and their recycling as alternative sources of future eco-efficient pozzolans, based on activated phyllosilicates. The presence of kaolinite in this waste indicates that thermal treatment at 600 °C for 2 h transformed these minerals into a highly reactive metakaolinite over the first seven days of the pozzolanic reaction. Moreover, high contents of metakaolinite, together with silica and alumina sheet structures, assisted the appearance of layered double hydroxides through metastable phases, forming stratlingite throughout the main phase of the pozzolanic reaction after 28 days (as recommended by the European Standard as the reaction proceeded.

30 CFR 827.12 - Coal preparation plants: Performance standards.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal preparation plants: Performance standards...-COAL PREPARATION PLANTS NOT LOCATED WITHIN THE PERMIT AREA OF A MINE § 827.12 Coal preparation plants..., modification, reclamation, and removal activities at coal preparation plants shall comply with the following...

Bioremediation potential of coal-tar-oil-contaminated soil

International Nuclear Information System (INIS)

Lajoie, C.A.

1991-01-01

The bioremediation of coal tar oil contaminated soil was investigated in 90 day laboratory simulation experiments. The effect of soil moisture, humic acid amendment, and coal tar oil concentration on the rate of disappearance of individual coal tar oil constituents (PAHs and related compounds) was determined by methylene chloride extraction and gas chromatography. Mass balance experiments determined the fate of both the individual 14 C-labeled PAHs phenanthrene, pyrene, and benzo(a)pyrene, and the total coal tar oil carbon. Mineralization, volatilization, incorporation into microbial biomass, disappearance of individual coal tar oil constitutents, and the distribution of residual 14 C-activity in different soil fractions were measured. The rate of disappearance of coal tar oil constituents increased with increasing soil moisture over the experimental range. Humic acid amendment initially enhanced the rate of disappearance, but decreased the extent of disappearance. The amount of contamination removed decreased at higher coal tar oil concentrations. The practical limit for biodegradation in the system tested appeared to be between 1.0 and 2.5% coal tar oil. Mineralization accounted for 40 to 50% of the applied coal tar oil. Volatilization was a minor pathway of disappearance

30 CFR 716.4 - Special bituminous coal mines.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Special bituminous coal mines. 716.4 Section... INTERIOR INITIAL PROGRAM REGULATIONS SPECIAL PERFORMANCE STANDARDS § 716.4 Special bituminous coal mines. (a) Definition. Special bituminous coal surface mines as used in this section means those bituminous...

A STUDY ON THE GRINDABILITY OF SERBIAN COALS

Directory of Open Access Journals (Sweden)

Dragoslava D Stojiljković

2011-01-01

Full Text Available Thermal power plants in the Republic of Serbia are making considerable efforts and even more considerable investments, not only to maintain electricity production at maximum design levels, but even to additionally increase the power output of existing generating units. Capacities of mills used in pulverized coal preparation are identified as one of the main constraints to achieving maximum mill plant capacity, while coal grindability is seen as one of the factors that directly affect capacities of the coal mills utilized in thermal power plants. The paper presents results of experimental investigation conducted for the purpose of determining Hardgrove grindability index of coal. The investigation was conducted in accordance with ISO 5074 and included analysis of approximately 70 coal samples taken from the open pit mine of Kolubara coal basin. Research results obtained indicate that coal rich in mineral matter and thus, of lower heating value is characterized by higher grindability index. Therefore, analyses presented in the paper suggest that characteristics of solid fuels analyzed in the research investigation conducted are such that the use coals less rich in mineral matter i. e. coals characterized by lower grindability index will cause coal mills to operate at reduced capacity. This fact should be taken into account when considering a potential for electricity production increase.

30 CFR 817.84 - Coal mine waste: Impounding structures.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal mine waste: Impounding structures. 817.84... ACTIVITIES § 817.84 Coal mine waste: Impounding structures. New and existing impounding structures constructed of coal mine waste or intended to impound coal mine waste shall meet the requirements of § 817.81...

30 CFR 49.20 - Requirements for all coal mines.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Requirements for all coal mines. 49.20 Section... TRAINING MINE RESCUE TEAMS Mine Rescue Teams for Underground Coal Mines § 49.20 Requirements for all coal mines. (a) The operator of each underground coal mine shall make available two certified mine rescue...

Chemical characterization of bottom ashes generated during combustion of a Colombian mineral coal in a thermal power plant

International Nuclear Information System (INIS)

Pinheiro, H.S.; Nogueira, R.E.F.Q.; Lobo, C.J.S.; Nobre, A.I.S.; Sales, J.C.; Silva, C.J.M.

2012-01-01

Bottom ashes generated during combustion of a mineral coal from Colombia were characterized by X-ray fluorescence spectrometry and X-ray diffraction. The interest in this particular coal is due to the fact that it will be used by a thermal power plant in Ceara, Northeastern Brazil, where it could produce over 900 tons of different residues/combustion products every day. Results from Xray fluorescence allowed identification and quantification of elements present in the sample: silicon (59,17%), aluminum (13,17%), iron (10,74%), potassium (6,11%), titanium (2,91%), calcium (4,97%), sulphur (0,84%) and others (2,09%). The X-ray diffraction revealed patterns from silica, mullite, calcium sulphate and hydrated sodium. Results obtained so far indicate that the material is a potential raw-material for use in the formulation of ceramic components (author)

Anatomy of an intruded coal, I: Effect of contact metamorphism on whole-coal geochemistry, Springfield (No. 5) (Pennsylvanian) coal, Illinois Basin

Energy Technology Data Exchange (ETDEWEB)

Rimmer, Susan M. [Department of Geology, Southern Illinois University Carbondale, Carbondale, IL 62901 (United States); Yoksoulian, Lois E. [Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506 (United States); Hower, James C. [Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511 (United States)

2009-08-01

If time and heating rate are important agents in coal maturation, one might expect to see differences in chemical changes in response to maturation depending on the means of increased rank. Using a suite of samples obtained from an intruded Pennsylvanian-age coal in southern Illinois, we present whole-coal chemical data. Comparing these data to extant geochemical data for coals that have undergone normal burial maturation, we evaluated the hypothesis that if coal alteration occurs rapidly (due to intrusion) rather than gradually (burial maturation), then different relationships are seen in chemical composition (proximate and ultimate analyses) and vitrinite reflectance. The Pennsylvanian-age (Asturian [Westphalian D]) Springfield (No. 5) coal is mined at the Big Ridge Mine, near Eldorado, southern Illinois. This high volatile B bituminous coal was intruded by an ultramafic igneous intrusion during the early Permian. Alteration occurs out to {proportional_to} 1.2 x dike thickness and includes an increase in random vitrinite reflectance (R{sub m}) from levels {proportional_to} 0.7% to over 5.3%, loss of liptinites, and formation of devolatilization vacuoles and fine mosaic texture. Decreases in volatile matter (VM) and increases in fixed carbon (FC) appear to be less than would be expected for the level of reflectance seen within the alteration halo. Carbonate minerals have a major influence on proximate analyses but even following the removal of carbonates, the decrease in VM is still less than would be seen in coals of similar vitrinite reflectance that were altered by normal burial maturation. Carbonate mineralization also contributes to variability in ultimate analysis values approaching the intrusion, particularly for %C and %O. After carbonate removal, data for these coals do not appear to follow the normal burial coalification tracks when plotted on a van Krevelen diagram and on a Seyler chart. These differences suggest that a slightly different maturation

30 CFR 817.81 - Coal mine waste: General requirements.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal mine waste: General requirements. 817.81... ACTIVITIES § 817.81 Coal mine waste: General requirements. (a) General. All coal mine waste disposed of in an... within a permit area, which are approved by the regulatory authority for this purpose. Coal mine waste...

30 CFR 816.81 - Coal mine waste: General requirements.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal mine waste: General requirements. 816.81... ACTIVITIES § 816.81 Coal mine waste: General requirements. (a) General. All coal mine waste disposed of in an... within a permit area, which are approved by the regulatory authority for this purpose. Coal mine waste...

Outlook 96: Minerals and Energy

International Nuclear Information System (INIS)

1996-01-01

Papers discussing the future of Australia's minerals and energy are presented under the following headings: Australia in the global minerals and energy markets; minerals exploration; steelmaking raw materials; aluminium and alumina; gold; nickel; base metals; titanium minerals; energy for a sustainable future; electricity; electricity in Asia; crude oil; coal trade; natural gas in Australia and uranium. Relevant papers are individually indexed/abstracted. Tabs., figs., refs

30 CFR 827.13 - Coal preparation plants: Interim performance standards.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal preparation plants: Interim performance...-COAL PREPARATION PLANTS NOT LOCATED WITHIN THE PERMIT AREA OF A MINE § 827.13 Coal preparation plants: Interim performance standards. (a) Persons operating or who have operated coal preparation plants after...

Ash liberation from included minerals during combustion of pulverized coal: the relationship with char structure and burnout

Energy Technology Data Exchange (ETDEWEB)

Wu, H.; Wall, T.; Liu, G.; Bryant, G. [University of Newcastle, Callaghan, NSW (Australia). CRC for Black Coal Utilization and Dept. of Chemical Engineering

1999-12-01

In this study, the float fraction ({lt} specific gravity of 2.0) of a size cut (63-90 {mu}m) bituminous coal was combusted in a drop tube furnace (DTF) at a gas temperature of 1300{degree}C under an atmosphere of air, to investigate the ash liberation at five coal burnoff levels (35.5%, 54.3%, 70.1%, 87.1% and 95.6%). The data indicated that char structure determines the ash liberation at different burnoff levels. Fragmentation of porous char was found to be the determinative mechanism for formation of fine ash during the early and middle stages of char combustion, while coalescence of included mineral matter determines the coarse ash formed in the later stages of combustion. The investigation confirmed that the char morphology and structure play a key role in determining char fragmentation, char burnout history, and the ash liberation during combustion. 35 refs., 5 figs., 2 tabs.

30 CFR 872.21 - What are historic coal funds?

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false What are historic coal funds? 872.21 Section... What are historic coal funds? (a) “Historic coal funds” are moneys provided under section 402(g)(5) of SMCRA based on the amount of coal produced before August 3, 1977, in your State or on Indian lands in...

Indochina area mineral prospects

Energy Technology Data Exchange (ETDEWEB)

1990-10-05

Prospects for commercial mining of various minerals are considered for Kampuchea (Cambodia), Laos, Vietnam, Myanmar (Burma) and Thailand. Mineral production is much below its geologic potential for economic and political reasons. Resource potential is limited to tin, tungsten, lead and zinc, barytes and gemstones, and coal. 1 fig.

Coal-related research, organic chemistry, and catalysis

International Nuclear Information System (INIS)

Anon.

1980-01-01

Coal chemistry research topics included: H exchange at 400 0 C, breaking C-C bonds in coal, molecular weight estimation using small-angle neutron scattering, 13 C NMR spectra of coals, and tunneling during H/D isotope effects. Studies of coal conversion chemistry included thermolysis of bibenzyl and 1-naphthol, heating of coals in phenol, advanced indirect liquefaction based on Koelbel slurry Fischer-Tropsch reactor, and plasma oxidation of coal minerals. Reactions of PAHs in molten SbCl 3 , a hydrocracking catalyst, were studied. Finally, heterogeneous catalysis (desulfurization etc.) was studied using Cu, Au, and Ni surfaces. 7 figures, 6 tables

30 CFR 702.16 - Stockpiling of minerals.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Stockpiling of minerals. 702.16 Section 702.16 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR GENERAL EXEMPTION FOR COAL EXTRACTION INCIDENTAL TO THE EXTRACTION OF OTHER MINERALS § 702.16 Stockpiling of...

Sumpor u ugljenu (Sulphur in Coal

Directory of Open Access Journals (Sweden)

Rađenović, A.

2004-12-01

Full Text Available The presence of sulphur in coal possesses important environmetal problems in its usage. The sulphur dioxide (S02 emissions produced during coal combustion account for a significant proportion of the total global output of anthropogenic SO2. The extent of sulphur separation depends on several variables such as the form of sulphur in coal, intimacy of contact between minerals and the products of devolatilization. The total sulphur in coal varies in the range of 0.2 - 11 wt %, although in most cases it is beetwen 1 and 3 wt %. Sulphur occurs in a variety of both inorganic and organic forms. Inorganic sulphur is found mainly as iron pyrite, marcasite, pyrrhotite, sphalerite, galena, chalcopirite and as sulphates (rarely exceeds w = 0,1 %. Organic sulphur is found in aromatic rings and aliphatic functionalities usually as mercaptans, aliphatic and aryl sulfides, disulfides and thiophenes. Organic and pyritic sulphur quantities depend on coal rank. Higher rank coals tend to have a high proportion of labile sulphur. All the organic sulphur is bivalent and it is spread throughout the organic coal matrix. Sulphur occurs in all the macerals and most minerals. Vitrinite contains the major part of organic sulphur and metals. Elemental sulphur is produced during coal weathering. The depolymerization methods as pyrolysis and hydrogenation are very drastic methods wich change the structure of the coal and the sulphur groups. In the case of pyrolysis, high levels of desulphurization, in chars and additional production of liquid hydrocarbon can be achieved. Thiophenes and sulphides were the major sulphur components of tars from coal pyrolysis. Hyrdogen sulphide and the lower mercaptans and sulphides were found in the volatile matters. Hydrogen sulphide and thiophenes are practically the only sulphur products of coal hydrogenation. H2S is produced in char hydrodesulphurization. A number of options are available for reducing sulphur emissions including the

Abundances and distribution of minerals and elements in high-alumina coal fly ash from the Jungar Power Plant, Inner Mongolia, China

Science.gov (United States)

Dai, S.; Zhao, L.; Peng, S.; Chou, C.-L.; Wang, X.; Zhang, Y.; Li, D.; Sun, Y.

2010-01-01

The fly ash from the Jungar Power Plant, Inner Mongolia, China, is unique because it is highly enriched in alumina (Al2O3>50%). The fly ash mainly consists of amorphous glass and mullite and trace amounts of corundum, quartz, char, calcite, K-feldspar, clay minerals, and Fe-bearing minerals. The mullite content in fly ash is as high as 37.4% because of high boehmite and kaolinite contents in feed coal. Corundum is a characteristic mineral formed during the combustion of boehmite-rich coal.Samples from the economizer were sieved into six size fractions (500 mesh) and separated into magnetic, mullite+corundum+quartz (MCQ) and glass phases for mineralogical and chemical analysis. The corundum content increases but amorphous glass decreases with decreasing particle size. Fractions of small particle sizes are relatively high in mullite, probably because mullite was formed from fine clay mineral particles under high-temperature combustion condition. Similarly, fine corundum crystals formed in the boiler from boehmite in feed coal. The magnetic phase consists of hematite, magnetite, magnesioferrite, and MgFeAlO4 crystals. The MCQ phase is composed of 89% mullite, 6.1% corundum, 4.5% quartz, and 0.5% K-feldspar.Overall, the fly ash from the power plant is significantly enriched in Al2O3 with an average of 51.9%, but poor in SiO2, Fe2O3, CaO, MgO, Na2O, P2O5, and As. Arsenic, TiO2, Th, Al2O3, Bi, La, Ga, Ni, and V are high in mullite, and the magnetic matter is enriched in Fe2O3, CaO, MnO, TiO2, Cs, Co, As, Cd, Ba, Ni, Sb, MgO, Zn, and V. The remaining elements are high in the glass fraction. The concentration of K2O, Na2O, P2O5, Nb, Cr, Ta, U, W, Rb, and Ni do not clearly vary with particle size, while SiO2 and Hg decrease and the remaining elements clearly increase with decreasing particle size. ?? 2009 Elsevier B.V.

Rosebud SynCoal Partnership, SynCoal{reg_sign} demonstration technology update

Energy Technology Data Exchange (ETDEWEB)

Sheldon, R.W. [Rosebud SynCoal Partnership, Billings, MT (United States)

1997-12-31

An Advanced Coal Conversion Process (ACCP) technology being demonstrated in eastern Montana (USA) at the heart of one of the world`s largest coal deposits is providing evidence that the molecular structure of low-rank coals can be altered successfully to produce a unique product for a variety of utility and industrial applications. The product is called SynCoal{reg_sign} and the process has been developed by the Rosebud SynCoal Partnership (RSCP) through the US Department of Energy`s multi-million dollar Clean Coal Technology Program. The ACCP demonstration process uses low-pressure, superheated gases to process coal in vibrating fluidized beds. Two vibratory fluidized processing stages are used to heat and convert the coal. This is followed by a water spray quench and a vibratory fluidized stage to cool the coal. Pneumatic separators remove the solid impurities from the dried coal. There are three major steps to the SynCoal{reg_sign} process: (1) thermal treatment of the coal in an inert atmosphere, (2) inert gas cooling of the hot coal, and (3) removal of ash minerals. When operated continuously, the demonstration plant produces over 1,000 tons per day (up to 300,000 tons per year) of SynCoal{reg_sign} with a 2% moisture content, approximately 11,800b Btu/lb and less than 1.0 pound of SO{sub 2} per million Btu. This product is obtained from Rosebud Mine sub-bituminous coal which starts with 25% moisture, 8,600 Btu/lb and approximately 1.6 pounds of SO{sub 2} per million Btu.

Coal Transition in the United Kingdom. An historical case study for the project 'Coal Transitions: Research and Dialogue on the Future of Coal'

International Nuclear Information System (INIS)

Fothergill, Steve

2017-01-01

This is one of the 6 country case-studies commissioned to collect experience on past coal transitions. The 6 countries are: Czech Republic, the Netherlands, Poland, Spain, UK, USA. Their role in the Coal Transitions project was to provide background information for a Synthesis Report for decision makers, and provide general lessons for national project teams to take into account in developing their coal transitions pathways for the future. The UK has virtually completed its move away from the production and use of coal - an astonishing transformation for an economy that once relied overwhelmingly on coal power. This is however a transformation that was never really 'planned' and the move away from coal started long before concerns about climate change achieved political prominence. Until as late as November 2015, for example, there was no government commitment to phase out coal in UK electricity generation. But it was already happening, and some of the most rapid change was actually in 2016, triggered in particular by the impact of a 'carbon tax' which has tipped the economics away from coal to gas-fired generation. A handful of coal-fired power stations will remain on the grid for a few years to help meet peak demand, but to all intents the UK is already entering the post-coal era. Whether this has been achieved without undue pain to coal mining areas is however deeply questionable. Job losses were for many years managed by a combination of redundancies and transfers to surviving mines. Redundancy payments, welfare benefits and early access to pensions provided support former miners, and careers advice and training was on offer. Most former miners have now reached retirement age. The big problem for mining communities has been replacement of the lost jobs. The UK has a long history of efforts to regenerate areas affected by coal closures and there is clear evidence that this has delivered positive results in the form of new jobs. Nevertheless, there continues to

ENVIRONMENTAL IMPACT ON PHYSIOLOGICAL RESPONSES OF UNDERGROUND COAL MINERS IN THE EASTERN PART OF INDIA.

Science.gov (United States)

Dey, Netai Chandra; Nath, Suva; Sharma, Gourab Dhara; Mallik, Avijit

2014-12-01

Coal in India is extracted generally by semi-mechanized and mechanized underground mining methods. The Bord and Pillar (B & P) mining method still continues to be popular where deployment of manual miners is more than that of other mining methods. The study is conducted at haulage based mine of Eastern Coalfields of West Bengal. Underground miners confront with a lot of hazards like extreme hostile environment, awkward working posture, dust, noise as well as low luminosity. It is difficult to delay the onset of fatigue. In order to study the physiological responses of trammers, various parameters like working heart rates, net cardiac cost and relative cardiac cost including recovery heart rate patterns are recorded during their work at site. Workload classification of trammers has been done following various scales of heaviness. The effect of environment on the physiological responses has been observed and suitable recommendations are made. The work tasks are bound to induce musculoskeletal problems and those problems could be better managed through rationalizing the work-rest scheduling.

Airways obstruction, coal mining, and disability.

OpenAIRE

Lapp, N L; Morgan, W K; Zaldivar, G

1994-01-01

It has recently been suggested that the inhalation of coal in the absence of complicated coal workers' pneumoconiosis (CWP) or smoking can lead to disabling airways obstruction. The cause of such obstruction has been variously attributed to emphysema or bronchitis. The frequency of significant airways obstruction in a group of United States coal miners seeking compensation for occupationally induced pulmonary impairment was therefore determined. In a sample of 611 "Black Lung" claimants there...

30 CFR 819.13 - Auger mining: Coal recovery.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Auger mining: Coal recovery. 819.13 Section 819....13 Auger mining: Coal recovery. (a) Auger mining shall be conducted so as to maximize the utilization and conservation of the coal in accordance with § 816.59 of this chapter. (b) Auger mining shall be...

Quantum chemistry calculation and experimental study on coal ash fusion characteristics of coal blend

Energy Technology Data Exchange (ETDEWEB)

Chen Yushuang; Zhang Zhong-xiao; Wu Xiao-jiang; Li Jie; Guang Rong-qing; Yan Bo [University of Shanghai for Science and Technology, Shanghai (China). Department of Power Engineering

2009-07-01

The coal ash fusion characteristics of high fusibility coal blending with two low fusibility coals respectively were studied. The data were analyzed using quantum chemistry methods and experiment from micro-and macro-molecular structures. The results show that Ca{sup 2+}, as the electron acceptor, easily enters into the lattice of mullite, causing a transition from mullite to anorthite. Mullite is much more stable than anorthite. Ca{sup 2+} of anorthite occupies the larger cavities with the (SiO{sub 4}){sup 4-} tetrahedral or (AlO{sub 4}){sup 5-} tetrahedral rings respectively. Ca atom linked O weakens Si-O bond, leading ash fusion point to reduce effectively. The chemistry, reactivity sites and bond-formation characteristics of minerals can well explain the reaction mechanism refractory minerals and flux ash melting process at high temperature. The results of experiment are agreed with the theory analysis by using ternary phase diagrams and quantitative calculation. 27 refs., 9 figs., 3 tabs.

Coal Mine Dust Desquamative Chronic Interstitial Pneumonia: A Precursor of Dust-Related Diffuse Fibrosis and of Emphysema.

Science.gov (United States)

Jelic, Tomislav M; Estalilla, Oscar C; Sawyer-Kaplan, Phyllis R; Plata, Milton J; Powers, Jeremy T; Emmett, Mary; Kuenstner, John T

2017-07-01

Diseases associated with coal mine dust continue to affect coal miners. Elucidation of initial pathological changes as a precursor of coal dust-related diffuse fibrosis and emphysema, may have a role in treatment and prevention. To identify the precursor of dust-related diffuse fibrosis and emphysema. Birefringent silica/silicate particles were counted by standard microscope under polarized light in the alveolar macrophages and fibrous tissue in 25 consecutive autopsy cases of complicated coal worker's pneumoconiosis and in 21 patients with tobacco-related respiratory bronchiolitis. Coal miners had 331 birefringent particles/high power field while smokers had 4 (pcoal miner had intra-alveolar macrophages with silica/silicate particles and interstitial fibrosis ranging from minimal to extreme. All coal miners, including those who never smoked, had emphysema. Fibrotic septa of centrilobular emphysema contained numerous silica/silicate particles while only a few were present in adjacent normal lung tissue. In coal miners who smoked, tobacco-associated interstitial fibrosis was replaced by fibrosis caused by silica/silicate particles. The presence of silica/silicate particles and anthracotic pigment-laden macrophages inside the alveoli with various degrees of interstitial fibrosis indicated a new disease: coal mine dust desquamative chronic interstitial pneumonia, a precursor of both dust-related diffuse fibrosis and emphysema. In studied coal miners, fibrosis caused by smoking is insignificant in comparison with fibrosis caused by silica/silicate particles. Counting birefringent particles in the macrophages from bronchioalveolar lavage may help detect coal mine dust desquamative chronic interstitial pneumonia, and may initiate early therapy and preventive measures.

Ash transformation in suspension fired boilers co-firing coal and straw

DEFF Research Database (Denmark)

Zheng, Yuanjing; Jensen, Peter Arendt; Jensen, Anker Degn

Appendix C: Paper in Fuel 87 (2008) 3304-3312: A kinetic study of gaseous potassium capture by coal minerals in a high temperature fixed-bed reactor......Appendix C: Paper in Fuel 87 (2008) 3304-3312: A kinetic study of gaseous potassium capture by coal minerals in a high temperature fixed-bed reactor...

Coal Mine Dust Desquamative Chronic Interstitial Pneumonia: A Precursor of Dust-Related Diffuse Fibrosis and of Emphysema

Directory of Open Access Journals (Sweden)

Tomislav M Jelic

2017-07-01

Full Text Available Background: Diseases associated with coal mine dust continue to affect coal miners. Elucidation of initial pathological changes as a precursor of coal dust-related diffuse fibrosis and emphysema, may have a role in treatment and prevention. Objective: To identify the precursor of dust-related diffuse fibrosis and emphysema. Methods: Birefringent silica/silicate particles were counted by standard microscope under polarized light in the alveolar macrophages and fibrous tissue in 25 consecutive autopsy cases of complicated coal worker's pneumoconiosis and in 21 patients with tobacco-related respiratory bronchiolitis. Results: Coal miners had 331 birefringent particles/high power field while smokers had 4 (p<0.001. Every coal miner had intra-alveolar macrophages with silica/silicate particles and interstitial fibrosis ranging from minimal to extreme. All coal miners, including those who never smoked, had emphysema. Fibrotic septa of centrilobular emphysema contained numerous silica/silicate particles while only a few were present in adjacent normal lung tissue. In coal miners who smoked, tobacco-associated interstitial fibrosis was replaced by fibrosis caused by silica/silicate particles. Conclusion: The presence of silica/silicate particles and anthracotic pigment-laden macrophages inside the alveoli with various degrees of interstitial fibrosis indicated a new disease: coal mine dust desquamative chronic interstitial pneumonia, a precursor of both dust-related diffuse fibrosis and emphysema. In studied coal miners, fibrosis caused by smoking is insignificant in comparison with fibrosis caused by silica/silicate particles. Counting birefringent particles in the macrophages from bronchioalveolar lavage may help detect coal mine dust desquamative chronic interstitial pneumonia, and may initiate early therapy and preventive measures.

Petrographic and mineral characterization of Balkan coals and their solid waste products from coal preparation

International Nuclear Information System (INIS)

Yossifova, M.

1995-01-01

This paper is part of a complex petrographic, mineralogical and chemical investigation on Balkan bituminous coals and their solid waste products from coal preparation. The petrographic and phase-mineralogical composition in ten composite samples and four water extracts have been studied by optical microscopy, scanning electron microscopy and X-ray diffraction. 4 refs., 4 tabs

DEVELOPMENT OF DEWATERING AIDS FOR MINERALS AND COAL FINES

Energy Technology Data Exchange (ETDEWEB)

Roe-Hoam Yoon; Ramazan Asmatulu; Ismail Yildirim; William Jansen; Jinmig Zhang; Brad Atkinson; Jeff Havens

2004-07-01

MCT has developed a suite of novel dewatering chemicals (or aids) that are designed to cause a decrease in the capillary pressures of the water trapped in a filter cake by (1) decreasing the surface tension of water, (2) increasing the contact angles of the particles to be dewatered, and (3) causing the particles to coagulate, all at the same time. The decrease in capillary pressure in turn causes an increase in the rate filtration, an increase in throughput, and a decrease in pressure drop requirement for filtration. The reagents are used frequently as blends of different chemicals in order to bring about the changes in all of the process variables noted above. The minerals and coal samples tested in the present work included copper sulfide, lead sulfide, zinc sulfide, kaolin clay, talc, and silica. The laboratory-scale test work included studies of reagent types, drying cycle times, cake thickness, slurry temperature, conditioning intensity and time, solid content, and reagent dosages. To better understand the mechanisms involved, fundamental studies were also conducted. These included the measurements of the contact angles of the particles to be dewatered (which are the measures of particle hydrophobicity) and the surface tensions of the filtrates produced from dewatering tests. The results of the laboratory-scale filtration experiments showed that the use of the novel dewatering aids can reduce the moistures of the filter cake by 30 to 50% over what can be achieved using no dewatering aids. In many cases, such high levels of moisture reductions are sufficient to obviate the needs for thermal drying, which is costly and energy intensive. Furthermore, the use of the novel dewatering aids cause a substantial increase in the kinetics of dewatering, which in turn results in increased throughput. As a result of these technological advantages, the novel dewatering aids have been licensed to Nalco, which is one of the largest mining chemicals companies of the world. At

Evaluation of the effect of macerals on coal permeability in Tazareh and Parvadeh mines

Directory of Open Access Journals (Sweden)

Farhang Sereshki

2016-08-01

Full Text Available In recent decades, the subject of gas emission in underground coal mines in many countries is an important subject. Many factors affect in gas emissions in coal seams. Geological and physical structures of coal are affecting on gas emissions'. Also, composition and mineralization of coal, affect in coal permeability for different gases. In this study, the relationship between maceral composition and coal permeability in Tazareh and Parvadeh mines has been studied. Accordingly, a laboratory studies to investigate the relationship between coal composition and coal permeability was done. In coal samples, with MFORR equipment the permeability test was done. With microscopic analysis, the maceral contents of coal such as Inertinite and Vitrinite have been measured. Accordingly, many coal samples of Parvadeh and Tazareh coal mines have the pyrite as the dominant mineral matter. Parvadeh coal samples has the average percentage of Vitrinite equal 81.34% and 10.52% Inertinite. Also, in the Tazareh coal samples in Eastern Alborz coal mines, the average percentage of Vitrinite is 69.31% and inertinite is 22.47%. The average percentage of Pyrite content in Parvadeh coal samples in Tabas coal mines is 2.38% and in the Tazareh coal samples in Eastern Alborz coal mines is 2.62%.  The permeability test results have been shown, which, with increase of Inertinite contents, the permeability of coal is increasing. Also, test results have been shown, there was a reduction in the coal permeability with increasing of mineral contents and carbonate contents of the coal. So, the coal permeability in Tabas coal samples is more than Eastern Alborz coal samples.

Overcapacity forces change on the coal industry

Energy Technology Data Exchange (ETDEWEB)

Soras, C.; Stodden, J.

1987-09-01

This article discusses the recent economic factors which have affected the coal mining industry in the USA, these include OPEC world oil prices, hostilities in the Gulf, strikes by miners and consumption rates. The recent years of over capacity have brought about key changes in the structure of the coal business and these are covered. The article forecasts an improvement in the market for coal, a free enterprise in the power market and a smaller but stronger coal industry in years to come.

Genesis of some tertiary Indian coals from the chemical composition ...

Indian Academy of Sciences (India)

Baruah. 2008) that in northeast Indian coals, the major minerals (wt% >5) identified in the crystalline matter of coal are quartz, kaolin, illite, feldspar, calcite, pyrite, and gypsum. Vassilev et al. (2010a, b) reported that the rank of the coal increases with.

Inflammatory pseudotumor of the lung in a coal miner with pneumoconiosis

Energy Technology Data Exchange (ETDEWEB)

Chou, T.K.; Hsu, C.J.; Chiang, C.Y.; Bai, K.J.; Huang, T.W. [Dept. of Health Executive of Yuan, Taipei (Taiwan)

2001-12-01

Inflammatory pseudotumors of the lung are uncommon and etiologically diverse lesions that often present as solitary masses in the lung. It may be difficult to distinguish these lesions from more commonly encountered lung neoplasms. Inflammatory pseudotumors can also occur in other organs, but the lung is most commonly involved. The authors describe a 63-year-old male coal miner with a 40-year history of dust exposure, who had a large right middle lobe mass on chest roentgenograms, with slow growth over the 7 years prior to admission. Repeated transthoracic echo-guided biopsies of the mass were indicative of an inflammatory and reactive process. The radiographic, histologic, and clinical findings indicated a diagnosis of inflammatory pseudotumor. The patient refused surgical intervention and was regularly followed at the outpatient clinic. Follow-up chest roentgenograms for 1 year revealed that the tumor site was stable. This case suggested that inflammatory, pseudotumor, although uncommon, should be included in the differential diagnosis in a patient with pneumoconiosis and a solitary mass in the lung.

Self-scrubbing coal

International Nuclear Information System (INIS)

Kindig, J.K.

1992-01-01

More than 502 million tons - 65 percent of all coal shipped to utilities in 1990 - were above 1.2 pounds of sulfur dioxide per million Btu. Most of the coal, even though cleaned in conventional coal preparation plants, still does not meet the emission limitation the Clean Air Act Amendments mandate for the year 2000. To cope with this fact, most utilities plan to switch to low sulfur (western U.S. or Central Appalachian) coal or install scrubbers. Both solutions have serous drawbacks. Switching puts local miners out of work and weakens the economy in the utility's service territory. Scrubbing requires a major capital expenditure by the utility. Scrubbers also increase the operating complexity and costs of the generating station and produce yet another environmental problem, scrubber sludge. Employing three new cost-effective technologies developed by Customer Coals International (CCl), most non-compliance coals east of the Mississippi River can be brought into year-2000 compliance. The compliance approach employed, depends upon the characteristics of the raw coal. Three types of raw coal are differentiated, based upon the amount of organic sulfur in the coals and the ease (or difficultly) of liberating the pyrite. They are: Low organic sulfur content and pyrite that liberates easily. Moderate organic sulfur content and pyrite that liberates easily. High organic sulfur content or the pyrite liberates with difficulty. In this paper examples of each type of raw coal are presented below, and the compliance approach employed for each is described. The names of the beneficiated coal products produced from each type of raw coal give above are: Carefree Coal, Self-Scrubbing Coal and Dry-Scrubbing Coal

Semi-automated petrographic assessment of coal by coal grain analysis

Energy Technology Data Exchange (ETDEWEB)

O' Brien, G.; Jenkins, B.; Ofori, P.; Ferguson, K. [CSIRO Exploration and Mining, Pullenvale, Qld. (Australia)

2007-04-15

A new classification method, coal grain analysis, which uses optical imaging techniques for the microscopic characterisation of the individual grains present in coal samples is discussed. This differs from other coal petrography imaging methods in that a mask is used to remove the pixels of mounting resin to obtain compositional information of the maceral (vitrinite, inertinite and liptinite) and mineral abundances on each individual grain within each image. Experiments were conducted to establish the density of individual constituents in order to enable the density of each grain to be determined and the results reported on a mass basis. The grains were sorted into eight grain classes of liberated (single component) and composite grains. By analysing all streams (feed, concentrate and tailings) of the flotation circuit at a coal washing plant, the flotation response of the individual grain classes was tracked. This has implications for flotation process diagnostics and optimisation.

Geochemistry of environmentally sensitive trace elements in Permian coals from the Huainan coalfield, Anhui, China

Science.gov (United States)

Chen, J.; Liu, Gaisheng; Jiang, M.; Chou, C.-L.; Li, H.; Wu, B.; Zheng, Lingyun; Jiang, D.

2011-01-01

To study the geochemical characteristics of 11 environmentally sensitive trace elements in the coals of the Permian Period from the Huainan coalfield, Anhui province, China, borehole samples of 336 coals, two partings, and four roof and floor mudstones were collected from mineable coal seams. Major elements and selected trace elements were determined by inductively coupled plasma optical emission spectrometry (ICP-OES), inductively coupled plasma mass spectrometry (ICP-MS), and hydride generation atomic absorption spectrometry (HAAS). The depositional environment, abundances, distribution, and modes of occurrence of trace elements were investigated. Results show that clay and carbonate minerals are the principal inorganic constituents in the coals. A lower deltaic plain, where fluvial channel systems developed successively, was the likely depositional environment of the Permian coals in the Huainan coalfield. All major elements have wider variation ranges than those of Chinese coals except for Mg and Fe. The contents of Cr, Co, Ni, and Se are higher than their averages for Chinese coals and world coals. Vertical variations of trace elements in different formations are not significant except for B and Ba. Certain roof and partings are distinctly higher in trace elements than underlying coal bench samples. The modes of occurrence of trace elements vary in different coal seams as a result of different coal-forming environments. Vanadium, Cr, and Th are associated with aluminosilicate minerals, Ba with carbonate minerals, and Cu, Zn, As, Se, and Pb mainly with sulfide minerals. ?? 2011 Elsevier B.V.

Contents and occurrence of cadmium in the coals from Guizhou province, China.

Science.gov (United States)

Song, Dangyu; Wang, Mingshi; Zhang, Junying; Zheng, Chuguang

2008-10-01

Eleven raw coal samples were collected from Liuzhi, Suicheng, Zunyi, Xingren, Xingyi, and Anlong districts in Guizhou Province, Southwest China. The content of cadmium (Cd) in coal was determined using inductively coupled plasma mass-spectrometry (ICP-MS). Cd contents ranged from 0.146 to 2.74 ppm (whole coal basis), with an average of 1.09 ppm. In comparison with the arithmetic means of Cd in Chinese coal (0.25 ppm), this is much higher. In order to find its occurrence in coal, float-sink analysis and a coal flotation test by progressive release were conducted on two raw coal samples. The content of the Cd and ash yield of the flotation products were determined. The organic matter was removed by low-temperature ashing (LTA). X-ray diffraction (XRD) was used to differentiate the main, minor, and trace minerals in the LTA from different flotation subproducts. Quartz, kaolinite, pyrite, and calcite were found to dominate the mineral matters, with a proportion of anatase, muscovite, and illite. Then quantitative analysis of minerals in LTA was conducted using material analysis using diffraction (MAUD) based on the Rietveld refinement method. Results show that Cd has a strong association with kaolinite.

Contents and occurrence of cadmium in the coals from Guizhou Province, China

Energy Technology Data Exchange (ETDEWEB)

Dangyu Song; Mingshi Wang; Junying Zhang; Chuguang Zheng [Henan Polytechnic University, Jiaozuo (China). Institute of Resources and Environment

2008-10-15

Eleven raw coal samples were collected from Liuzhi, Suicheng, Zunyi, Xingren, Xingyi, and Anlong districts in Guizhou Province, Southwest China. The content of cadmium (Cd) in coal was determined using inductively coupled plasma mass-spectrometry (ICP-MS). Cd contents ranged from 0.146 to 2.74 ppm (whole coal basis), with an average of 1.09 ppm. In comparison with the arithmetic means of Cd in Chinese coal (0.25 ppm), this is much higher. In order to find its occurrence in coal, float-sink analysis and a coal flotation test by progressive release were conducted on two raw coal samples. The content of the Cd and ash yield of the flotation products were determined. The organic matter was removed by low-temperature ashing (LTA). X-ray diffraction (XRD) was used to differentiate the main, minor, and trace minerals in the LTA from different flotation subproducts. Quartz, kaolinite, pyrite, and calcite were found to dominate the mineral matters, with a proportion of anatase, muscovite, and illite. Then quantitative analysis of minerals in LTA was conducted using material analysis using diffraction (MAUD) based on the Rietveld refinement method. Results show that Cd has a strong association with kaolinite.

78 FR 48591 - Refuge Alternatives for Underground Coal Mines

Science.gov (United States)

2013-08-08

... Administration 30 CFR Parts 7 and 75 Refuge Alternatives for Underground Coal Mines; Proposed Rules #0;#0;Federal... Underground Coal Mines AGENCY: Mine Safety and Health Administration, Labor. ACTION: Limited reopening of the... for miners to deploy and use refuge alternatives in underground coal mines. The U.S. Court of Appeals...

Mineral statistics yearbook 1994

International Nuclear Information System (INIS)

1994-01-01

A summary of mineral production in Saskatchewan was compiled and presented as a reference manual. Statistical information on fuel minerals such as crude oil, natural gas, liquefied petroleum gas and coal, and of industrial and metallic minerals, such as potash, sodium sulphate, salt and uranium, was provided in all conceivable variety of tables. Production statistics, disposition and value of sales of industrial and metallic minerals were also made available. Statistical data on drilling of oil and gas reservoirs and crown land disposition were also included. figs., tabs

Variation in mineral composition of coal during enrichment and coking

Energy Technology Data Exchange (ETDEWEB)

M.L. Ulanovskii; A.N. Likhenko [Ukrkoks Coke Producers' Association, Dnepropetrovsk (Ukraine)

2009-06-15

The parameters I{sub b} and B{sub b} used in developing an optimal coking-batch composition are determined from data on the chemical composition of the ash in Donetsk Basin and other coal. It is found that, when the ash content is reduced in deeper enrichment of coal with an increased content of fine pyrite, there will be accompanying increase in the Fe{sub 2}O{sub 3} content and decrease in the SiO{sub 2} content of the ash in lighter fractions. This increases I{sub b}. In other words, reducing the ash content of the coal is an unpromising means of increasing CRI and CSR of the coke produced. Three ash-containing elements (silicon, aluminum, and iron) are experimentally proven to transfer from coal to coke. Specific behavior of calcium, magnesium, alkali metals, and sulfur during coking.

Effects of torpedo blasting on rockburst prevention during deep coal seam mining in the Upper Silesian Coal Basin

Czech Academy of Sciences Publication Activity Database

Wojtecki, Ł.; Koníček, Petr; Schreiber, J.

2017-01-01

Roč. 9, č. 4 (2017), s. 694-701 ISSN 1674-7755 Institutional support: RVO:68145535 Keywords : rockburst prevention * torpedo blasting * seismic effect * Upper Silesian Coal Basin (USCB) Subject RIV: DH - Mining, incl. Coal Mining OBOR OECD: Mining and mineral processing http://www.sciencedirect.com/science/article/pii/S1674775517300896

Characterization of Malaysian coals for carbon dioxide sequestration

Science.gov (United States)

Abunowara, M.; Bustam, M. A.; Sufian, S.; Eldemerdash, U.

2016-06-01

Coal samples from Mukah-Balingian and Merit-Pila coal mines were characterized with ultimate, approximate, petrographic analysis, FT-IR spectra patterns, FESEM images and BET measurements to obtain information on the chemical composition and chemical structure in the samples. Two coal samples were obtained from Merit-Pila coal mine namely sample1 (S1) and sample2 (S2). The other two coal samples were obtained from Mukah-Balingian coal mine namely sample3 (S3) and sample4 (S4), Sarawak, Malaysia. The results of ultimate analysis show that coal S1 has the highest carbon percentage by 54.47%, the highest hydrogen percentage by 10.56% and the lowest sulfur percentage by 0.19% and the coal S4 has the highest moisture content by 31.5%. The coal S1 has the highest fixed carbon percentage by 42.6%. The coal S4 has BET surface area by 2.39 m2/g and Langmuir surface area by 3.0684 m2/g respectively. Fourier-Transform Infrared (FT-IR) spectroscopy analysis of all coal samples shows a presence of oxygen containing functional groups which considered are as active sites on coal surface. The oxygen functional groups are mainly carboxyl (-COOH), hydroxyl (-OH), alkyl (-CH, -CH2, -CH3), aliphatic (C-O-C stretching associated with -OH), amino (-NH stretching vibrations), (-NH stretching vibrations), aromatic (C=C), vinylic (C=C) and clay minerals. In all FE-SEM images of coal samples matrix, it can be seen that there are luminous and as non luminous features which refer to the existence of various minerals types distributed in the coal organic matrix. The bright luminosity is due to the presence of sodium, potassium or aluminium. According to petrographic analysis, all coal sample samples are range in vitrinite reflectance from 0.38% to 56% (VRr) are sub-bituminous coals.

State coal profiles, January 1994

Energy Technology Data Exchange (ETDEWEB)

1994-02-02

The purpose of State Coal Profiles is to provide basic information about the deposits, production, and use of coal in each of the 27 States with coal production in 1992. Although considerable information on coal has been published on a national level, there is a lack of a uniform overview for the individual States. This report is intended to help fill that gap and also to serve as a framework for more detailed studies. While focusing on coal output, State Coal Profiles shows that the coal-producing States are major users of coal, together accounting for about three-fourths of total US coal consumption in 1992. Each coal-producing State is profiled with a description of its coal deposits and a discussion of the development of its coal industry. Estimates of coal reserves in 1992 are categorized by mining method and sulfur content. Trends, patterns, and other information concerning production, number of mines, miners, productivity, mine price of coal, disposition, and consumption of coal are detailed in statistical tables for selected years from 1980 through 1992. In addition, coal`s contribution to the State`s estimated total energy consumption is given for 1991, the latest year for which data are available. A US summary of all data is provided for comparing individual States with the Nation as a whole. Sources of information are given at the end of the tables.

Obtention and characterization of ceramic products with addition of the mineral coal bottom ashes from thermoelectric power plants; Obtencao e caracterizacao de produtos ceramicos com a adicao de cinzas pesadas de carvao mineral provenientes de usinas termeletricas

Energy Technology Data Exchange (ETDEWEB)

Kniess, C.T.; Prates, P.B.; Brys, M.; Martins, G.J.; Riella, H.G., E-mail: kniesscl@gmail.com [Universidade Federal de Santa Catarina (UFSC), SC (Brazil); Bernardin, A. [Universidade do Extremo Sul de Santa Catarina (UNESC), SC (Brazil)

2011-07-01

The physical, chemical and mineralogical properties of mineral coal bottom ash derived from thermoelectric power plants are compatible with various raw materials used in ceramic industries, which indicates a possibility of partial or fully substitution of raw materials by this residue. This work intends to obtain and characterize ceramic products with additions of different percentages of bottom ash coal. For this, was used a commercial ceramic body (CI) made by an industry in the state of Santa Catarina. The formulations of the ceramics products were obtained by the mixture design (planning network Simplex). The byproduct of coal bottom ash was found to be an attractive raw material source of SiO{sub 2} and Al{sub 2}O{sub 3} to obtain ceramic materials. Was demonstrated the possibility of developing a ceramic materials classified as semi-porous (6 10) with additions of up to 20% of coal bottom ash in the composition of the ceramic body. (author)

Banking on coal: perspectives on a Cape Breton community within an international context

Energy Technology Data Exchange (ETDEWEB)

Campbell, D.F.

1997-12-31

The development of the coal mining industry in Inverness, Cape Breton, Nova Scotia is described from the discovery of coal in the 17th century to the closing of the last mine in 1953, with its aftermath within the single industry community. The impact of the mines and unions on the community, public perception of coal miners, the miners self-perception, social and religious aspects, and politics are considered. Studies of three other coal mining communities (in Great Britain, the United States, and Australia) are examined, as a comparison. 140 refs., 283 notes, 11 photos.

Miners' strike 1984-85

Energy Technology Data Exchange (ETDEWEB)

Brown, L; Salter, S [comps.

1985-01-01

References relating to the 1984-85 UK miners strike are listed under the following subject headings: events and analysis - a chronological record; short term effects - coal stocks and supplies, electricity supplies, financial, industrial and economic; the miners and their leadership; social aspects - civil liberties, media coverage, mining communities, picketing, policing, the future; pit closures. 240 references.

Australian mineral industry annual review 1977 (including information to June 1978)

Energy Technology Data Exchange (ETDEWEB)

Ward, J

1979-01-01

This article records growth of the Australian mineral industry and reports production, consumption, treatment, trade, prices, new developments, exploration, and resources for all mineral commodities including fuels. Equivalent development abroad is summarized. Appendices include principal mineral producers, associations, etc. and royalties. Black coal is described under the headings: production, ex-mine value of output, employment, wages and salaries, production per manshift, interstate trade, port facilities, consumption, stock, prices, new developments, exploration, resources, world review, and coke. There are numerous tables of data and a flow chart of the Australian black coal industry, 1977. Brown coal includes production, consumption, new developments, exploration, resources, and world review.

Study on the technology of decreasing ash and sulfur in coking coal concentrate by deep-cleaning

Energy Technology Data Exchange (ETDEWEB)

Li, A.; Li, P.; Chen, S. [Hefei Design and Research Institute of Coal Industry, Hefei (China)

2007-06-15

Middling fractions of coking coal, a rare resource in China, were analysed for their embedded minerals both in kind and distribution. Observation with a microscope shows that most are clay minerals of very small particle size. The embedded minerals can be liberated from middling by grinding. Clean coal can be obtained from ground middling by the flocculation-flotation process. The yield of clean coal could thus be increased and its ash and sulfur content decreased. 3 refs., 2 figs., 4 tabs.

Outlook for the Australian coal market

International Nuclear Information System (INIS)

Anon.

1990-01-01

A shortage of bituminous coal is now being witnessed on the world market, which stems from an increase in demand for it. The prices for bituminous coal, which have been increasing since 1988, will continue to rise in 1990. World coal production in 1989/1990 has been estimated by the Australian Bureau of Mineral Resources at 3,370 million tons, which is 50 million tons more than in the preceding year. Australian experts predict a doubling in world demand for coal by 2025. Many Australian coal mining companies, counting on the increased demand in the future, are taking measures to consolidate production and strengthen their financial base in order to accelerate development of new fields or expand production at existing mines. It is expected that the highest rates of growth in demand will be for power coal. Because of increased world production of steel the demand for coking coal will also rise, but the rates of growth will be much lower than for power coal

Quantifying exhaustible resource theory: an application to mineral taxation policy

International Nuclear Information System (INIS)

Ward, F.A.; Kerkvliet, J.

1993-01-01

The paper presents the results of a dynamic nonlinear programming model of a mineral resource market with several features of heterogeneous quality in the mineral, links with related product markets, incorporation of institutional constraints, resource allocations for each year in the planning period, and analysis of outcomes under various severance tax rates. The model computes privately efficient competitive use paths to perform cost-benefit analysis of public mineral policies. Policy variables are evaluated for their impact on both private behaviour and public benefits. The application is to New Mexico's linked coal and electric power markets. Findings reveal that scarcity rents are currently 4% of coal's price, and peak at 27% in 43 years. Increasing the present 1 dollar/ton New Mexico severance tax to 11 dollars reduces current annual coal output by 25%, prolongs the life of the state's coal industry by three years, and increases discounted severance tax revenues by 850% or 4.2 billion dollars. 38 refs., 2 figs., 4 tabs

30 CFR 875.13 - Certification of completion of coal sites.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Certification of completion of coal sites. 875... Certification of completion of coal sites. (a) The Governor of a State, or the equivalent head of an Indian tribe, may submit to the Secretary a certification of completion of coal sites. The certification must...

ELECTROKINETIC DENSIFICATION OF COAL FINES IN WASTE PONDS

Energy Technology Data Exchange (ETDEWEB)

E. James Davis

1999-12-18

The objective of this research was to demonstrate that electrokinetics can be used to remove colloidal coal and mineral particles from coal-washing ponds and lakes without the addition of chemical additives such as salts and polymeric flocculants. The specific objectives were: Design and develop a scaleable electrophoresis apparatus to clarify suspensions of colloidal coal and clay particles; Demonstrate the separation process using polluted waste water from the coal-washing facilities at the coal-fired power plants in Centralia, WA; Develop a mathematical model of the process to predict the rate of clarification and the suspension electrical properties needed for scale up.

FT-IR and XRD analysis of coal from Makum coalfield of Assam

Indian Academy of Sciences (India)

iliary fuels, such as natural gas or imported coals to satisfy the coal quality requirement for ther- mal power generation, particularly from the emis- sion point of view. Since mineral matter affects almost all aspects of coal utilization, the accep- tance of coal for industrial application depends critically on both organic and ...

30 CFR 817.87 - Coal mine waste: Burning and burned waste utilization.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal mine waste: Burning and burned waste...-UNDERGROUND MINING ACTIVITIES § 817.87 Coal mine waste: Burning and burned waste utilization. (a) Coal mine... extinguishing operations. (b) No burning or unburned coal mine waste shall be removed from a permitted disposal...

30 CFR 816.87 - Coal mine waste: Burning and burned waste utilization.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal mine waste: Burning and burned waste...-SURFACE MINING ACTIVITIES § 816.87 Coal mine waste: Burning and burned waste utilization. (a) Coal mine... extinguishing operations. (b) No burning or burned coal mine waste shall be removed from a permitted disposal...

Environmental management in the Australian minerals and energy industries: principles and practices

Energy Technology Data Exchange (ETDEWEB)

Mulligan, D.R. [ed.] [University of Queensland, St. Lucia, Qld. (Australia). Centre for Mined Land Rehabilitation, Dept. of Agriculture

1996-12-31

This is a comprehensive reference text on the principles and practices of environmental management being developed and implemented in Australia`s mining and energy industries. It also present a set of case histories focused on individual minerals (coal, sand, aluminium, iron ore, base metals, uranium, mineral sands, construction materials and petroleum). The 5 of the 20 chapters of particular relevance to the coal industry have been abstracted separately for the IEA Coal Research CD-ROM. 800 refs.

Mineralogy and geochemistry of the No. 6 Coal (Pennsylvanian) in the Junger Coalfield, Ordos Basin, China

Energy Technology Data Exchange (ETDEWEB)

Dai, Shifeng [Key Laboratory of Resource Exploration Research of Hebei Province, Handan 056038 (China); Ren, Deyi; Li, Shengsheng; Jiang, Yaofa [China University of Mining and Technology, D11, Xueyuan Road, Haidian District, Beijing 100083 (China); Chou, Chen-Lin [Illinois State Geological Survey (Emeritus), 615 East Peabody Drive, Champaign, IL 61820 (United States)

2006-04-03

This paper discusses the mineralogy and geochemistry of the No. 6 Coal (Pennsylvanian) in the Junger Coalfield, Ordos Basin, China. The results show that the vitrinite reflectance (0.58%) is lowest and the proportions of inertinite and liptinite (37.4% and 7.1%, respectively) in the No. 6 Coal of the Junger Coalfield are highest among all of the Late Paleozoic coals in the Ordos Basin. The No. 6 Coal may be divided vertically into four sections based on their mineral compositions and elemental concentrations. A high boehmite content (mean 6.1%) was identified in the No. 6 Coal. The minerals associated with the boehmite in the coal include goyazite, rutile, zircon, and Pb-bearing minerals (galena, clausthalite, and selenio-galena). The boehmite is derived from weathered and oxidized bauxite in the weathered crust of the underlying Benxi Formation (Pennsylvanian). A high Pb-bearing mineral content of samples ZG6-2 and ZG6-3 is likely of hydrothermal origin. The No. 6 coal is enriched in Ga (44.8 {mu}g/g), Se (8.2 {mu}g/g), Sr (423 {mu}g/g), Zr (234 {mu}g/g), REEs (193.3 {mu}g/g), Hg (0.35 {mu}g/g), Pb (35.7 {mu}g/g), and Th (17.8 {mu}g/g). Gallium and Th in the No. 6 Coal mainly occur in boehmite, and the Pb-bearing selenide and sulfide minerals contribute not only to Se and Pb contents in the coal, but also probably to Hg content. A high Zr content is attributed to the presence of zircon, and Sr is related to goyazite. The REEs in the coal are supplied from the sediment-source region, and the REEs leached from the adjacent partings by groundwater. (author)

Mineralogy and geochemistry of the No. 6 Coal (Pennsylvanian) in the Junger Coalfield, Ordos Basin, China

Science.gov (United States)

Dai, S.; Ren, D.; Chou, C.-L.; Li, S.; Jiang, Y.

2006-01-01

This paper discusses the mineralogy and geochemistry of the No. 6 Coal (Pennsylvanian) in the Junger Coalfield, Ordos Basin, China. The results show that the vitrinite reflectance (0.58%) is lowest and the proportions of inertinite and liptinite (37.4% and 7.1%, respectively) in the No. 6 Coal of the Junger Coalfield are highest among all of the Late Paleozoic coals in the Ordos Basin. The No. 6 Coal may be divided vertically into four sections based on their mineral compositions and elemental concentrations. A high boehmite content (mean 6.1%) was identified in the No. 6 Coal. The minerals associated with the boehmite in the coal include goyazite, rutile, zircon, and Pb-bearing minerals (galena, clausthalite, and selenio-galena). The boehmite is derived from weathered and oxidized bauxite in the weathered crust of the underlying Benxi Formation (Pennsylvanian). A high Pb-bearing mineral content of samples ZG6-2 and ZG6-3 is likely of hydrothermal origin. The No. 6 coal is enriched in Ga (44.8 ??g/g), Se (8.2 ??g/g), Sr (423 ??g/g), Zr (234 ??g/g), REEs (193.3 ??g/g), Hg (0.35 ??g/g), Pb (35.7 ??g/ g), and Th (17.8 ??g/g). Gallium and Th in the No. 6 Coal mainly occur in boehmite, and the Pb-bearing selenide and sulfide minerals contribute not only to Se and Pb contents in the coal, but also probably to Hg content. A high Zr content is attributed to the presence of zircon, and Sr is related to goyazite. The REEs in the coal are supplied from the sediment-source region, and the REEs leached from the adjacent partings by groundwater. ?? 2005 Elsevier B.V. All rights reserved.

Proceedings of the international symposium on coal - science, technology, industry, business, environment

Energy Technology Data Exchange (ETDEWEB)

Narasimhan, K.S.; Sen, S. [eds.

1996-12-31

Papers were presented which covered the areas of coal science, advanced coal preparation, coal utilization, coal chemicals and the environment. These included carbon aromaticity, mineral studies, utilization of low rank coals, bioconversion of methane, swelling of coals, photocatalytic activity, flotation and effects of oxidation, microbial desulfurization, deashing, briquetting, commercial scale conversion of coal to fuels and chemicals, role of coal in iron and steel making, coal-water mixtures, dyes and chemical products, nitrogen oxides emissions and pollution control. 45 papers have been abstracted separately for the IEA Coal Research CD-ROM.

Assessing the Impact of Removing Select Materials from Coal Mine Overburden, Central Appalachia Region, USA

Science.gov (United States)

The exposure of readily soluble components of overburden materials from surface coal mining to air and water results in mineral oxidation and carbonate mineral dissolution, thus increasing coal mine water conductivity. A conductivity benchmark of 300 µS/cm for mine water dischar...

Geochemistry of ultra-fine and nano-compounds in coal gasification ashes: A synoptic view

Energy Technology Data Exchange (ETDEWEB)

Kronbauer, Marcio A. [Centro Universitário La Salle, Mestrado em Avaliação de Impactos Ambientais em Mineração, Victor Barreto, 2288 Centro, 92010-000 Canoas, RS (Brazil); Universidade Federal do Rio Grande do Sul, Escola de Engenharia, Departamento de Metalurgia, Centro de Tecnologia, Av. Bento Gonçalves, 9500, Bairro Agronomia, CEP: 91501-970, Porto Alegre, RS (Brazil); Izquierdo, Maria [School of Applied Sciences, Cranfield University, Bedfordshire MK43 0AL (United Kingdom); Dai, Shifeng [State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083 (China); Waanders, Frans B. [School of Chemical and Minerals Engineering, North West University (Potchefstroom campus), Potchefstroom 2531 (South Africa); Wagner, Nicola J. [School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg (South Africa); Mastalerz, Maria [Indiana Geological Survey, Indiana University, Bloomington, IN 47405-2208 (United States); Hower, James C. [University of Kentucky Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511 (United States); Oliveira, Marcos L.S. [Environmental Science and Nanotechnology Department, Catarinense Institute of Environmental Research and Human Development, IPADHC, Capivari de Baixo, Santa Catarina (Brazil); Taffarel, Silvio R.; Bizani, Delmar [Centro Universitário La Salle, Mestrado em Avaliação de Impactos Ambientais em Mineração, Victor Barreto, 2288 Centro, 92010-000 Canoas, RS (Brazil); and others

2013-07-01

The nano-mineralogy, petrology, and chemistry of coal gasification products have not been studied as extensively as the products of the more widely used pulverized-coal combustion. The solid residues from the gasification of a low- to medium-sulfur, inertinite-rich, volatile A bituminous coal, and a high sulfur, vitrinite-rich, volatile C bituminous coal were investigated. Multifaceted chemical characterization by XRD, Raman spectroscopy, petrology, FE-SEM/EDS, and HR-TEM/SEAD/FFT/EDS provided an in-depth understanding of coal gasification ash-forming processes. The petrology of the residues generally reflected the rank and maceral composition of the feed coals, with the higher rank, high-inertinite coal having anisotropic carbons and inertinite in the residue, and the lower rank coal-derived residue containing isotropic carbons. The feed coal chemistry determines the mineralogy of the non-glass, non-carbon portions of the residues, with the proportions of CaCO{sub 3} versus Al{sub 2}O{sub 3} determining the tendency towards the neoformation of anorthite versus mullite, respectively. Electron beam studies showed the presence of a number of potentially hazardous elements in nanoparticles. Some of the neoformed ultra-fine/nano-minerals found in the coal ashes are the same as those commonly associated with oxidation/transformation of sulfides and sulfates. - Highlights: • Coal waste geochemisty can provide increased environmental information in coal-mining areas. • Oxidation is the major process for mineral transformation in coal ashes. • The electron bean methodology has been applied to investigate neoformed minerals.

Mine Water Treatment in Hongai Coal Mines

Science.gov (United States)

Dang, Phuong Thao; Dang, Vu Chi

2018-03-01

Acid mine drainage (AMD) is recognized as one of the most serious environmental problem associated with mining industry. Acid water, also known as acid mine drainage forms when iron sulfide minerals found in the rock of coal seams are exposed to oxidizing conditions in coal mining. Until 2009, mine drainage in Hongai coal mines was not treated, leading to harmful effects on humans, animals and aquatic ecosystem. This report has examined acid mine drainage problem and techniques for acid mine drainage treatment in Hongai coal mines. In addition, selection and criteria for the design of the treatment systems have been presented.

Coal dust contiguity-induced changes in the concentration of TNF- and NF- B p65 on the ocular surface

Energy Technology Data Exchange (ETDEWEB)

Sun, Z.Y.; Hong, J.; Liu, Z.Y.; Jin, X.D.; Gu, C.H. [China Medical University, Shenyang (China)

2009-07-01

To observe the influence of coal dust on ocular surface of coal miners and rabbits with coal dust contiguity on expression TNF- and NF- Bp65 and dry eye occurrence. Expression TNF- and NF- Bp65 in ocular surface were determined. Results showed tear production, BUT and lysozyme decreased for coal miners and rabbits with coal dust contiguity. Coal dust exposure was linked to development of xerophthalmia, and induced a higher expression of NF- B p65 and TNF- perhaps as a mechanism to resist coal dust ocular surface injury.

Analysis of participation in the federally mandated coal workers' health-surveillance program

International Nuclear Information System (INIS)

Nickolaus, M.E.

1987-01-01

The Federal Coal Mine Health and Safety Act of 1969 required that periodic chest radiographs be offered to underground coal miners to protect the miners from the development of Coal Workers' Pneumoconiosis (CWP) and progression of the disease to progressive massive fibrosis (PMF). These examinations are administered by the National Institute for Occupational Safety and Health (NIOSH) through the Coal Workers' Health Surveillance Program (CWHSP). This study developed rates of participation for each of 558 West Virginia underground coal mines who submitted or had NIOSH assigned plans for making chest radiographs available during the third round, July 1978 through December 1980. These rates were analyzed in relation to desired levels of participation and to reinforcing, predisposing and enabling factors presumed to affect rates of participation in disease prevention and surveillance programs

Development of zero conditioning procedure for coal reverse flotation

Energy Technology Data Exchange (ETDEWEB)

D.P. Patil; J.S. Laskowski [University of British Columbia, Vancouver, BC (Canada). Mining Engineering Department

2008-04-15

The zero conditioning method was developed to facilitate the flotation of gangue minerals in the reverse coal flotation process. Batch and continuous methods were developed to maintain the zero conditioning principle during reverse flotation. Batch zero conditioning was achieved by adding the required amount of DTAB in one step, as soon as the air was introduced into the system. The continuous zero conditioning method involves uninterrupted addition of DTAB through a specially built sparger in the form of aerosol during the flotation experiment. This produces active bubbles that carry collector. The addition of DTAB in the form of aerosol during reverse flotation proved to be better in reducing the ash of a sub-bituminous (LS-26) coal from 34.7% to 22.9% with a froth product (gangue) yield of 36.8% without any depressant. In the presence of coal depressant (dextrin, 0.5 kg/t), the ash content of LS-26 coal was reduced from 34.7% to 16.5% at a clean coal yield of 55%, whereas the conventional (forward) flotation with fuel oil provided a clean coal containing 16.5% ash with only 29.2% yield. These results prove that flotation of gangue minerals is very much improved by maintaining zero conditioning time conditions in a coal reverse flotation process.

Mine Water Treatment in Hongai Coal Mines

OpenAIRE

Dang Phuong Thao; Dang Vu Chi

2018-01-01

Acid mine drainage (AMD) is recognized as one of the most serious environmental problem associated with mining industry. Acid water, also known as acid mine drainage forms when iron sulfide minerals found in the rock of coal seams are exposed to oxidizing conditions in coal mining. Until 2009, mine drainage in Hongai coal mines was not treated, leading to harmful effects on humans, animals and aquatic ecosystem. This report has examined acid mine drainage problem and techniques for acid mine ...

The chemical transformation of calcium in Shenhua coal during combustion in a muffle furnace

Energy Technology Data Exchange (ETDEWEB)

Tian, Sida [North China Electric Power Univ., Beijing (China). School of Energy, Power and Mechanical Engineering; Ministry of Education, Beijing (China). Key Lab. of Condition Monitoring and Control for Power Plant Equipment; Zhuo, Yuqun; Chen, Changhe [Tsinghua Univ., Beijing (China). Dept. of Thermal Engineering; Ministry of Education, Beijing (China). Key Lab. for Thermal Science and Power Engineering; Shu, Xinqian [China Univ. of Mining and Technology, Beijing (China). School of Chemical and Environmental Engineering

2013-07-01

The chemical reaction characteristics of calcium in three samples of Shenhua coal, i.e. raw sample, hydrochloric acid washed sample and hydrochloric acid washed light fraction, during combustion in a muffle furnace have been investigated in this paper. Ca is bound by calcite and organic matter in Shenhua coal. X ray diffraction (XRD) phase analysis has been conducted to these samples' combustion products obtained by heating at different temperatures. It has been found that the organically-bound calcium could easily react with clays and transform into gehlenite and anorthite partially if combusted under 815 C, whilst the excluded minerals promoted the conversion of gehlenite to anorthite. Calcite in Shenhua coal decomposed into calcium oxide and partially transformed into calcium sulfate under 815 C, and formed gehlenite and anorthite under 1,050 C. Calcite and other HCl-dissolved minerals in Shenhua coal were responsible mainly for the characteristic that the clay minerals in Shenhua coal hardly became mullite during combustion.

Size Effect on Acoustic Emission Characteristics of Coal-Rock Damage Evolution

OpenAIRE

Wen, Zhijie; Wang, Xiao; Chen, Lianjun; Lin, Guan; Zhang, Hualei

2017-01-01

Coal-gas outburst, rock burst, and other mine dynamic disasters are closely related to the instability and failure of coal-rock. Coal-rock is the assemblies of mineral particles of varying sizes and shapes bonded together by cementing materials. The damage and rupture process of coal-rock is accompanied by acoustic emission (AE), which can be used as an effective means to monitor and predict the instability of coal-rock body. In this manuscript, considering the size effect of coal-rock, the i...

POC-scale testing of a dry triboelectrostatic separator for fine coal cleaning

Energy Technology Data Exchange (ETDEWEB)

Yoon, R.H.; Luttrell, G.H.; Adel, G.T. [Virginia Polytechnic Institute and State Univ., Blacksburg, VA (United States)

1995-11-01

Numerous advanced coal cleaning processes have been developed in recent years that are capable of substantially reducing both the ash and sulfur contents of run-of-mine coals. The extent of cleaning depends on the liberation characteristics of the coal, which generally improve with reducing particle size. however, since most of the advanced technologies are wet processes, the clean coal product must be dewatered before it can be transported and burned in conventional boilers. This additional treatment step significantly increases the processing cost and makes the industrial applicability of these advanced technologies much less attractive. In order to avoid problems associated with fine coal dewatering, researchers at the Pittsburgh Energy Technology Center (PETC) developed a novel triboelectrostatic separation (TES) process that can remove mineral matter from dry coal. In this technique, finely pulverized coal is brought into contact with a material (such as copper) having a work function intermediate to that of the carbonaceous material and associated mineral matter. Carbonaceous particles having a relatively low work function become positively charged, while particles of mineral matter having significantly higher work functions become negatively charged. once the particles become selectively charged, a separation can be achieved by passing the particle stream through an electrically charged field. Details related to the triboelectrostatic charging phenomenon have been discussed elsewhere (Inculet, 1984).

Distribution of sulfur and pyrite in coal seams from Kutai Basin (East Kalimantan, Indonesia): Implications for paleoenvironmental conditions

Energy Technology Data Exchange (ETDEWEB)

Widodo, Sri [Department of Mining Engineering, Moslem University of Indonesia, Jln. Urip Sumoharjo, Makassar (Indonesia); Oschmann, Wolfgang [Institute of Geosciece, J.W. Goethe-University, Altenhoeferallee 1, D-60438 Frankfurt a.M. (Germany); Bechtel, Achim; Sachsenhofer, Reinhard F. [Department of Applied Geoscience and Geophysics, University of Leoben, Peter-Tunner-Str.5, A-8700 Leoben (Austria); Anggayana, Komang [Department of Mining Engineering, Bandung Institute of Technology, Jln. Ganesa 10, I-40132 Bandung (Indonesia); Puettmann, Wilhelm [Institute of Atmospheric and Environmental Sciences, Dapartment of Analytical Enviromental Chemistry, J.W. Goethe-University, Altenhoeferallee 1, D-60438 Frankfurt a.M. (Germany)

2010-03-01

Thirteen Miocene coal samples from three active open pit and underground coal mines in the Kutai Basin (East Kalimantan, Indonesia) were collected. According to our microscopical and geochemical investigations, coal samples from Sebulu and Centra Busang coal mines yield high sulfur and pyrite contents as compared to the Embalut coal mine. The latter being characterized by very low sulfur (< 1%) and pyrite contents. The ash, mineral, total sulfur, iron (Fe) and pyrite contents of most of the coal samples from the Sebulu and Centra Busang coal mines are high and positively related in these samples. Low contents of ash, mineral, total sulfur, iron (Fe) and pyrite have been found only in sample TNT-32 from Centra Busang coal mine. Pyrite was the only sulfur form that we could recognize under reflected light microscope (oil immersion). Pyrite occurred in the coal as framboidal, euhedral, massive, anhedral and epigenetic pyrite in cleats/fractures. High concentration of pyrite argues for the availability of iron (Fe) in the coal samples. Most coal samples from the Embalut coal mine show lower sulfur (< 1 wt.%) and pyrite contents as found within Centra Busang and Sebulu coals. One exception is the coal sample KTD-38 from Embalut mine with total sulfur content of 1.41 wt.%. The rich ash, mineral, sulfur and pyrite contents of coals in the Kutai Basin (especially Centra Busang and Sebulu coals) can be related to the volcanic activity (Nyaan volcanic) during Tertiary whereby aeolian material was transported to the mire during or after the peatification process. Moreover, the adjacent early Tertiary deep marine sediment, mafic igneous rocks and melange in the center of Kalimantan Island might have provided mineral to the coal by uplift and erosion. The inorganic matter in the mire might also originate from the ground and surface water from the highland of central Kalimantan. (author)

Minerals Policy Statement 2: controlling and mitigating the environmental effects of minerals extraction in England

Energy Technology Data Exchange (ETDEWEB)

NONE

2005-03-15

Minerals Policy Statement 2 (MPS2) sets out the policies and considerations that the UK Government expects Mineral Planning Authorities to follow when preparing development plans and in considering application for minerals development. This supercedes Minerals Policy Guidance 11 (MPG 11). Annex 1: Dust to MPS2 sets out the policy considerations in relation to dust from mineral workings and associated operations, and how they should be dealt with in local development plans and in considering individual applications. Annex 2: Noise to MPS2 addresses policy in relation to noise from mineral workings. These have been abstracted separately for the Coal Abstracts database. 58 refs., 2 apps.

Activity and structure of calcined coal gangue

Energy Technology Data Exchange (ETDEWEB)

Gong Chenchen; Li Dongxu; Wang Xiaojun; Li Zongjin [Nanjing University of Technology, Nanjing (China). College of Materials Science and Engineering

2007-12-15

Coal gangue was activated by means of calcination in seven temperature ranges. Systematic research was made about activation mechanism and structural evolution. The glycerin-ethanol method, SEM, MIP and XRD were used to determine the variation of structure and activation of coal gangue during calcination. The experimental results show that because of heat treatment in the range of calcination temperatures, mineral composition and microstructure of coal gangue are changed. In addition, its activity is improved. The amount of lime absorbed by the sample calcined at 700{sup o}C is 2-4 times that by uncalcined coal gangue in the course of hydration. When NaOH is added to coal gangue-lime system, the hydration reaction rate of the system is increased and the microstructure of hydrating samples of coal gangue is improved.

Recommended procedures and techniques for the petrographic description of bituminous coals

Science.gov (United States)

Chao, E.C.T.; Minkin, J.A.; Thompson, C.L.

1982-01-01

Modern coal petrology requires rapid and precise description of great numbers of coal core or bench samples in order to acquire the information required to understand and predict vertical and lateral variation of coal quality for correlation with coal-bed thickness, depositional environment, suitability for technological uses, etc. Procedures for coal description vary in accordance with the objectives of the description. To achieve our aim of acquiring the maximum amount of quantitative information within the shortest period of time, we have adopted a combined megascopic-microscopic procedure. Megascopic analysis is used to identify the distinctive lithologies present, and microscopic analysis is required only to describe representative examples of the mixed lithologies observed. This procedure greatly decreases the number of microscopic analyses needed for adequate description of a sample. For quantitative megascopic description of coal microlithotypes, microlithotype assemblages, and lithotypes, we use (V) for vitrite or vitrain, (E) for liptite, (I) for inertite or fusain, (M) for mineral layers or lenses other than iron sulfide, (S) for iron sulfide, and (X1), (X2), etc. for mixed lithologies. Microscopic description is expressed in terms of V representing the vitrinite maceral group, E the exinite group, I the inertinite group, and M mineral components. volume percentages are expressed as subscripts. Thus (V)20(V80E10I5M5)80 indicates a lithotype or assemblage of microlithotypes consisting of 20 vol. % vitrite and 80% of a mixed lithology having a modal maceral composition V80E10I5M5. This bulk composition can alternatively be recalculated and described as V84E8I4M4. To generate these quantitative data rapidly and accurately, we utilize an automated image analysis system (AIAS). Plots of VEIM data on easily constructed ternary diagrams provide readily comprehended illustrations of the range of modal composition of the lithologic units making up a given coal

A study of trends in occupational risks associated with coal mining

International Nuclear Information System (INIS)

Amoudru, C.

1980-01-01

The coal industry is well known as a major source of specific types of risk and harmful effects including, for instance, harm to the environment, pollution from various surface installations and hazards associated with the actual task of mining. We shall confine our attention to the third group and discuss only the occupational risks facing miners and ex-miners. Unlike the nuclear and oil industries, coal-mines employ very large work-forces, and the risks associated with mining therefore have a considerable impact. Mining is also a highly integrated industry: a mine's own work-force carries out all the underground engineering work (preparatory excavations, installation work, etc.) as well as maintenance. In this narrow field, a distinction should immediately be drawn between two main areas: industrial accidents; and occupational diseases, which include silicosis or, more precisely, coal-miner's pneumoconiosis

Associations of polymorphisms in the cytokine genes IL1β (rs16944), IL6 (rs1800795), IL12b (rs3212227) and growth factor VEGFA (rs2010963) with anthracosilicosis in coal miners in Russia and related genotoxic effects.

Science.gov (United States)

Volobaev, Valentin P; Larionov, Aleksey V; Kalyuzhnaya, Ekaterina E; Serdyukova, Ekaterina S; Yakovleva, Svetlana; Druzhinin, Vladimir G; Babich, Olga O; Hill, Elena G; Semenihin, Victor A; Panev, Nikolay I; Minina, Varvara I; Sivanesan, Saravana Devi; Naoghare, Pravin; da Silva, Juliana; Barcelos, Gustavo R M; Prosekov, Alexander Y

2018-04-13

Anthracosilicosis (AS), a prevalent form of pneumoconiosis among coal miners, results from the accumulation of carbon and silica in the lungs from inhaled coal dust. This study investigated genotoxic effects and certain cytokine genes polymorphic variants in Russian coal miners with АS. Peripheral leukocytes were sampled from 129 patients with AS confirmed by X-ray and tissue biopsy and from 164 asymptomatic coal miners. Four single-nucleotide polymorphisms were genotyped in the extracted DNA samples: IL1β T-511C (rs16944), IL6 C-174G (rs1800795), IL12b A1188C (rs3212227) and VEGFA C634G (rs2010963). Genotoxic effects were assessed by the analysis of chromosome aberrations in cultured peripheral lymphocytes. The mean frequency of chromatid-type aberrations and chromosome-type aberrations, namely, chromatid-type breaks and dicentric chromosomes, was found to be higher in AS patients [3.70 (95% confidence interval {CI}, 3.29-4.10) and 0.28 (95% CI, 0.17-0.38)] compared to the control group [2.41 (95% CI, 2.00-2.82) and 0.09 (95% CI, 0.03-0.15)], respectively. IL1β gene T/T genotype (rs16944) was associated with AS [17.83% in AS patients against 4.35% in healthy donors, odds ratio = 4.77 (1.88-12.15), P < 0.01]. A significant increase in the level of certain chromosome interchanges among AS donors is of interest because such effects are typical for radiation damage and caused by acute oxidative stress. IL1β T allele probably may be considered as an AS susceptibility factor among coal miners.

Australian mineral industry annual review. Preliminary summaries 1985

Energy Technology Data Exchange (ETDEWEB)

1986-01-01

Salient statistics and a general industry overview are presented. Special attention is given to the following mineral commodities: aluminium, black coal, copper, fertiliser minerals, gemstones, gold, iron, lead, manganese, nickel, tin, titanium, tungsten, uranium, zinc and zirconium.

78 FR 25308 - Proposed Collection; Comment Request; Coal Mine Dust Sampling Devices

Science.gov (United States)

2013-04-30

...; Coal Mine Dust Sampling Devices AGENCY: Mine Safety and Health Administration, Labor. ACTION: 60-Day... mines. CPDMs must be designed and constructed for coal miners to wear and operate without impeding their... related to Coal Mine Dust Sampling Devices. MSHA is particularly interested in comments that: Evaluate...

The geochemistry and bioreactivity of fly-ash from coal-burning power stations

Energy Technology Data Exchange (ETDEWEB)

Jones, T.; Wlodarczyk, A.; Koshy, L.; Brown, P.; Longyi, S.; BeruBe, K. [Cardiff University, Cardiff (United Kingdom). School of Earth & Ocean Science

2009-07-01

Fly-ash is a byproduct of the combustion of coal in power stations for the generation of electricity. The fly-ash forms from the melting of incombustible minerals found naturally in the coal. The very high coal combustion temperatures result in the formation of microscopic glass particles from which minerals such as quartz, haematite and mullite can later recrystallize. In addition to these minerals, the glassy fly-ash contains a number of leachable metals. Mullite is a well-known material in the ceramics industry and a known respiratory hazard. Macroscopically mullite can be found in a large range of morphologies; however microscopic crystals appear to favour a fibrous habit. Fly-ash is a recognized bioreactive material in rat lung, generating hydroxyl radicals, releasing iron, and causing DNA damage. However, the mechanisms of the bioreactivity are still unclear and the relative contributions of the minerals and leachable metals to that toxicity are not well known.

Recent coal and uranium investment agreements in the Third World

International Nuclear Information System (INIS)

Zorn, S.A.

1982-01-01

The improvements made by developing countries in the 1970s in petroleum and mineral agreements with transnational corporations have been well documented, and substantial evidence exists to show that some real gains, in terms of host country control over operations, distribution of economic benefits, better employment and training requirements, etc., have in fact been made. In the case of the energy-related minerals, uranium and coal, however, relatively few contracts between Third World governments and transnational corporations have become public, and it is thus difficult to document whether the same gains made in the case of petroleum or non-fuel minerals have been achieved in relation to these energy resources. This article reviews a number of such recent coal and uranium agreements in developing countries. In overall terms, these agreements do not go as far in providing for the interests of host countries as do those negotiated for petroleum or hard minerals. The reasons for this apparent weakness in developing countries' bargaining power in the case of uranium and coal include the specific nature of the markets for these minerals, the structure of transnational corporations in the industry, and the very secrecy which has kept most of these contracts from public view. (Auth.)

Provisional 2008 assessment of solid mineral fuels

International Nuclear Information System (INIS)

2009-03-01

This article first comments data on solid mineral fuel consumption in France in 2008, i.e., the overall consumption, and the consumption by different sectors (energy production in coal plants, iron and steel industry, other industries, housing and office buildings). Then, it comments solid mineral fuel imports and their origins. It comments and explains the price evolution since 1999 (notably on the Antwerp-Rotterdam-Amsterdam market) in relationship with maritime transport price, availabilities and problems, and with the evolution of coal demand (notably in China) and oil prices. Finally, it briefly comments the French residual production and stocks

Mine Water Treatment in Hongai Coal Mines

Directory of Open Access Journals (Sweden)

Dang Phuong Thao

2018-01-01

Full Text Available Acid mine drainage (AMD is recognized as one of the most serious environmental problem associated with mining industry. Acid water, also known as acid mine drainage forms when iron sulfide minerals found in the rock of coal seams are exposed to oxidizing conditions in coal mining. Until 2009, mine drainage in Hongai coal mines was not treated, leading to harmful effects on humans, animals and aquatic ecosystem. This report has examined acid mine drainage problem and techniques for acid mine drainage treatment in Hongai coal mines. In addition, selection and criteria for the design of the treatment systems have been presented.

One-stop shopping in Africa's minerals supermarket

International Nuclear Information System (INIS)

Spira, J.

1980-01-01

Johannesburg in South Africa is one of the minerals capitals of the world, providing a one-stop shopping supermarket for the most sought-after strategic minerals. Total annual mineral sales grew from R1563 million in 1970 to R6876 million in 1978. For 1979 the figure exceeded R9700 million. Production, trade and marketing of gold, coal, platinum, uranium, diamonds, iron ore, copper, antimony, mineral sands, asbestos and vanadium are shortly discussed

30 CFR 75.1907 - Diesel-powered equipment intended for use in underground coal mines.

Science.gov (United States)

2010-07-01

... underground coal mines. 75.1907 Section 75.1907 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE SAFETY AND HEALTH MANDATORY SAFETY STANDARDS-UNDERGROUND COAL MINES Diesel-Powered Equipment § 75.1907 Diesel-powered equipment intended for use in underground coal mines. (a) As of...

30 CFR 903.761 - Areas designated unsuitable for surface coal mining by act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by act of Congress. 903.761 Section 903.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, applies to surface coal mining...

30 CFR 933.761 - Areas designated unsuitable for surface coal mining by Act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by Act of Congress. 933.761 Section 933.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated Unsuitable for Coal Mining by Act of Congress, with...

Role of non-ferrous coal minerals and by-product metallic wastes in coal liquefaction. Technical progress report, December 1, 1980-February 28, 1981

Energy Technology Data Exchange (ETDEWEB)

Garg, D.; Givens, E.N.; Schweighardt, F.K.; Curtis, C.W.; Guin, J.A.; Huang, W.J.; Shridharani, K.

1981-04-01

Results from screening studies showed that the pyrite samples separated from various coal seams had similar catalytic activity. The addition of all the pyrite samples to feed slurry increased conversion of coal and production of oil. A sample of fusinite was also tested for its liquefaction behavior with and without added pyrite. The addition of pyrite increased the conversion of fusinite and production of oil. These results show that pyrite catalyzes the conversion of fusinite and therefore improves overall coal conversion. Conversion of coal and oil production increased by impregnating coal with iron and molybdenum compounds. Coal conversion and oil production also increased with increasing concentration of both iron and molybdenum impregnated on coal. Addition of various transition metal sulfides increased coal conversion and oil production. Dramatic improvements were noted with nickel, vanadium, and tin sulfides. Addition of transition metal naphthenates produced mixed results; some of them improved coal conversion and others had no effect. The effect of metal concentration on coal conversion was also not clear. Deep cleaning of coal did not affect coal conversion, but it significantly reduced oil production. Addition of pyrite separated from coal to deep cleaned coal sample regained the oil production to the original value, i.e., oil produced from liquefaction of raw coal.Coal cleaned by oil agglomeration gave highest coal conversion and oil production. Basic and non-basic nitrogen compounds reduced the naphthalene hydrogenation activity of both Co-Mo-Al and sulfided Fe/sub 2/O/sub 3/. Sulfided Fe/sub 2/O/sub 3/ was inactive for denitrogenation of quinoline, and the reaction product mainly consisted of hydrogenated and hydrocracked quinoline. On the contrary, Co-Mo-Al was active for denitrogenation of quinoline, resulting in lower quinoline poisoning.

Coal mine safety achievements in the USA and the contribution of NIOSH research

Energy Technology Data Exchange (ETDEWEB)

Esterhuizen, G.S.; Gurtunca, R.G. [NIOSH, Washington, DC (United States)

2006-12-15

Over the past century coal miner safety and health have seen tremendous improvements: the fatality and injury rates continue to decrease while productivity continues to increase. Many of the hazards that plagued miners in the past, such as coal bumps, methane and coal dust explosions, ground fall accidents and health issues have been significantly reduced. The contribution of NIOSH research includes products for prevention and survival of mine fires, methane control measures, design procedure for underground coal mines, methods for excavation surface controls, methods and procedures for blasting, laser usage in underground mines and prevention of electrocution from overhead power lines that have reduced accidents and injuries in underground coal mines. Health research has produced products such as the personal dust monitor, noise abating technologies and ergonomic solutions for equipment operators. Research priorities at NIOSH are set by considering surveillance statistics, stakeholder inputs and loss control principles. Future research in coal mining is directed towards respiratory diseases, noise-induced hearing loss, repetitive musculoskeletal injuries, traumatic injuries, falls of ground and mine disasters. The recent spate of accidents in coal mines resulted in the Miner Act of 2006, which includes a specific role for NIOSH in future mine safety research and development. The mine safety achievements in the USA reflect the commitment of industry, labour, government and research organizations to improving the safety of the mine worker.

Micrinite maceral evidence of hydrocarbon generation in cretaceous coal measures of the middle Benue trough, Nigeria

International Nuclear Information System (INIS)

Obaje, N. G.; Ukpabio, E. J.; Funtua, I. I.

1999-01-01

Maceral analysis on samples from the coal and coal-bearing strata of the Awgu Formation in the Middle Benue Trough of Nigeria allows the subdivision of the coal beds and inter seam sediments into three different petrographic/coal facies, namely: a vitrinite-fusinite coal facies which is rich in vitrinite, poor in liptinite, with variable amounts of inertinite and low mineral matter content; a trimaceritic coal facies which is rich in vitrinite, liptinite and inertinite with low mineral matter content; and a shaley coal facies which, expectedly, is dominated by mineral matter and has variable amounts of vitrinite, liptinite and inertinite. Micrinite macerals constitute 8.2% and 4.5 on mineral matter-counted basis in samples from the trimaceritic and shaley coal facies respectively. These amounts, in both cases, are considered to be very high. They occur as finely particulate, rounded grains approximately I um in diameter. Most of the micrinite are closely associated with highly reflecting, almost unrecognizable liptinite. The nature and origin of micrinite and its significance to oil and gas generation have been studied extensively. As secondary macerals, they are generally believed to be relics of oil generation from oil-prone macerals, mainly liptinitic and vitrinitic macerals with which they are closely associated. Reflectance measurements on the associated vitrinite macerals indicate a thermal maturity range of 0.74 - 1.25 % Rm. This range corresponds to the zone of oil generation in most minerogenic oil source rocks. In the study area, however, only the trimaceritic coal facies and some parts of the shaley coal facies that are rich in liptinite alongside the associated micrinite macerals are considered to have generated oil. The vitrinite-fusinite coal facies with its high content of humic organic matter (vitrinite + Inertinite) can only generate gas (wet + dry) within the given thermal maturity range

Gasifier feed: Tailor-made from Illinois coals

Energy Technology Data Exchange (ETDEWEB)

Ehrlinger, H.P. III.

1991-01-01

The purpose of this research is to develop a coal slurry from waste streams using Illinois coal that is ideally suited for a gasification feed. The principle items to be studied are (1) methods of concentrating pyrite and decreasing other ash forming minerals into a high grade gasification feed using froth flotation and gravity separation techniques; (2) chemical and particle size analyses of coal slurries; (3) determination of how that slurry can be densified and to what degree of densification is optimum from the pumpability and combustibility analyses; and (4) reactivity studies.

Improving Competitiveness of U.S. Coal Dialogue

Energy Technology Data Exchange (ETDEWEB)

Kokkinos, Angelos [Energetics, Inc., Colubmia, MD (United States)

2018-02-01

The Improving Competitiveness of U.S. Coal Dialogue held in September 2017 explored a broad range of technical developments that have the potential to improve U.S. coal competitiveness in domestic and overseas markets. The workshop is one in a series of events hosted by DOE to gather expert input on challenges and opportunities for reviving the coal economy. This event brought together coal industry experts to review developments in a broad range of technical areas such as conventional physical (e.g. dense-medium) technologies, and dry coal treatments; thermal, chemical, and bio-oxidation coal upgrading technologies; coal blending; and applications for ultrafine coal and waste streams. The workshop was organized to focus on three main discussion topics: Challenges and Opportunities for Improving U.S. Coal Competitiveness in Overseas Markets, Mineral Processing, and Technologies to Expand the Market Reach of Coal Products. In each session, invited experts delivered presentations to help frame the subsequent group discussion. Throughout the discussions, participants described many possible areas of research and development (R&D) in which DOE involvement could help to produce significant outcomes. In addition, participants discussed a number of open questions—those that the industry has raised or investigated but not yet resolved. In discussing the three topics, the participants suggested potential areas of research and issues for further investigation. As summarized in Table ES-1, these crosscutting suggestions centered on combustion technologies, coal quality, coal processing, environmental issues, and other issues. The discussions at this workshop will serve as an input that DOE considers in developing initiatives that can be pursued by government and industry. This workshop generated strategies that described core research concepts, identified implementation steps, estimated benefits, clarified roles of government and industry, and outlined next steps. While

Moral Values Congruence and Miners' Policy Following Behavior: The Role of Supervisor Morality.

Science.gov (United States)

Lu, Hui; Chen, Hong; Du, Wei; Long, Ruyin

2017-06-01

Ethical culture construction is beneficial to maximize policy following behavior (PFB) and avoid accidents of coal miners in an economic downturn. This paper examines the congruence between coal mine ethical culture values (ECVs) and miners' moral values (MVs) and the relationship with PFB. To shed light on this relationship, supervisor moral values (SMVs) act as a key moderator. We build on the initial structure of values to measure ECVs, MVs, and SMVs. At the same time, available congruence was defined to describe the relationship between the two values. Drawing upon a survey of 267 miners in Chinese large state-owned coal mining enterprises, results revealed that ECVs-MVs congruence had a linear relationship with intrinsic PFB (IPFB) and a non-linear relationship with extrinsic PFB. These findings demonstrate that SMVs had a moderating effect on the relationship between ECVs-MVs congruence and extrinsic PFB. Thus, we continued to calculate the available congruence scope in tested enterprises. Furthermore, this study gives relative management proposals and suggestions to improve miners' moral standards and to reduce coal mine accidents.

30 CFR 942.761 - Areas designated unsuitable for surface coal mining by act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by act of Congress. 942.761 Section 942.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

30 CFR 910.761 - Areas designated unsuitable for surface coal mining by Act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by Act of Congress. 910.761 Section 910.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

30 CFR 921.761 - Areas designated unsuitable for surface coal mining by Act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by Act of Congress. 921.761 Section 921.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

30 CFR 947.761 - Areas designated unsuitable for surface coal mining by act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by act of Congress. 947.761 Section 947.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

30 CFR 939.761 - Areas designated unsuitable for surface coal mining by Act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by Act of Congress. 939.761 Section 939.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

30 CFR 941.761 - Areas designated unsuitable for surface coal mining by act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by act of Congress. 941.761 Section 941.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

30 CFR 922.761 - Areas designated unsuitable for surface coal mining by act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by act of Congress. 922.761 Section 922.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

30 CFR 905.761 - Areas designated unsuitable for surface coal mining by act of Congress.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Areas designated unsuitable for surface coal mining by act of Congress. 905.761 Section 905.761 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION... Congress. Part 761 of this chapter, Areas Designated by Act of Congress, shall apply to surface coal mining...

Mineral conversion and microstructure change in the melting process of Shenmu coal ash

Energy Technology Data Exchange (ETDEWEB)

Yang Jianguo; Deng Furong; Zhao Hong; Cen Kefa [Zhejiang University, Hangzhou (China). State Key Laboratory of Clean Energy Utilization

2007-05-15

China has rich reserves of Shenmu coal, which has the typical characteristic of low-melting-point ash. If used in the pulverized-coal boiler of a power plant, Shenmu coal would cause serious slagging. In order to solve the slagging problem of Shenmu coal, the melting mechanism of Shenmu coal ash was studied. One of the Shenmu coals - Wenjialiang coal - was selected for the study. Using thermogravimetry-differential scanning colorimetry (TG-DSC) methods, the change of the coal ash's physicochemistry with temperature was studied. The typical temperature points in the melting process were obtained. Ash samples of the different temperature points were prepared in a high-temperature furnace with parameters similar to those used in the TG-DSC test, and were then cooled quickly in water. Later, the ash samples were analyzed using X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX) methods in detail. Wenjialiang coal ash started to melt at 980{sup o}C. The ash was found to melt to a great extent at 1200{sup o}C and formed a multiform microstructure. At 1260{sup o}C, it was found to melt into a dense body with many pores, and formed a piece of vitreous body at 1340{sup o}C. Anorthite and gehlenite are the intermediate products that exist between 980 and 1340{sup o}C. They may be the main cause of the ash having low melting points, so that they could convert into a eutectic at low temperatures.

Cross flow cyclonic flotation column for coal and minerals beneficiation

Science.gov (United States)

Lai, Ralph W.; Patton, Robert A.

2000-01-01

An apparatus and process for the separation of coal from pyritic impurities using a modified froth flotation system. The froth flotation column incorporates a helical track about the inner wall of the column in a region intermediate between the top and base of the column. A standard impeller located about the central axis of the column is used to generate a centrifugal force thereby increasing the separation efficiency of coal from the pyritic particles and hydrophillic tailings.

Minerals yearbook: The mineral industry of Brazil. 1988 international review

International Nuclear Information System (INIS)

Ensminger, H.R.

1988-01-01

Brazil's gross domestic product (GDP) grew only slightly in 1988 to $277 billion at current prices. The growth rate was the smallest registered since 1983, when the rate was minus 2.8%. The economy's performance was strongly influenced by a 2% to 3% decrease in industrial production and civil construction. The mineral industry, however, countered the downward trend in the industrial sector and grew a modest 1.4%. Topics discussed in the report include the following: Government policies and programs; Production; Trade; Commodity review--Metals (Aluminum, Aluminia, and Bauxite, Columbium, Copper, Gold, Iron and Steel, Manganese, Tin, Titanium); Industrial Minerals (Gem stones, Phosphate rock, Quartz); Mineral fuels (Coal, Natural gas, Petroleum, Nuclear power); Nonmineral energy sources (Alcohol, Hydroelectric)

Overview of the Malaysian mineral industry

Energy Technology Data Exchange (ETDEWEB)

Dahan, A.R.B. (Department of Mines (Malaysia))

1992-08-01

The article describes the status of the mining industry in Malaysia. Tin dominated the industry until a price fall caused closure of many mines in 1987-1990. Other minerals mined include copper, gold, iron ore, bauxite, barite, kaolin, limestone, clays, sand and gravel. Coal production in Malaysia resumed when an opencast mine was opened in July 1988 in Sarawak. Another started operation in early 1989 by the underground method. At the end of 1990 there was a total of 53 exploration rights granted for gold, coal, base metals and industrial minerals. A few coalfields have been identified. Generally the industry has suffered a decline because of lack of new investment. 1 fig.

Sustainable development of the minerals sector in the APEC region

Energy Technology Data Exchange (ETDEWEB)

Jane Melanie; Kate Penney; Angelica Austin; Chris Rumley; Robert Curtotti

2007-01-15

The objectives in this report are to analyse the global market outlook for minerals over the medium term, identify key issues affecting the sustainability of the minerals sector in the APEC region and recommend possible actions to respond to these issues. These issues are structured around the APEC pillars of trade and investment liberalisation; business facilitation; and economic and technical cooperation. The report highlights the need for a strong and effective policy framework to allow APEC economies to capitalise on growth opportunities in global minerals markets. This is an updated version of ABARE Research Report 06.8. Minerals covered are: thermal coal. metallurgical coal, aluminium, alumina, bauxite, copper, gold, iron ores, lead, nickel, tin, uranium and zinc. 15 figs., 19 tabs.

Dating of authigenic clays related to igneous intrusions in Hunter Valley Coals

International Nuclear Information System (INIS)

Zwingmann, H.

2000-01-01

The Sydney Basin is composed mainly of Permian and Triassic marine and non-marine clastic sedimentary strata together with economically significant coal deposits and volumetrically minor igneous rocks. Many of these igneous rocks are also economically significant not only for their use in the construction industry but also for their deleterious effects on coal mining, particularly in underground mines utilising longwall extraction systems. Igneous activity in the Sydney Basin ranges from Early Permian to Tertiary in age and although episodic in nature, activity was unlikely to have ceased for periods of more than approximately 10 million years (Carr and Facer 1980; Embleton et al. 1982). Dating of the time of emplacement of igneous rocks using the K-Ar isotopic system is a relatively straightforward procedure if suitable analytical facilities and samples of appropriate, fresh, primary minerals are available. In the case of intrusions in coal seams, however, the occurrence of fresh, primary minerals is very rare due to widespread alteration produced by interaction between the igneous rock and fluids in the coal seam. This interaction produces a variety of secondary minerals with most primary minerals and glass being altered to clays (mainly kaolinite) and carbonates. Consequently, relatively few isotopic dates for intrusions into coal seams have been determined. A detailed study of several hundred samples of igneous rocks from the Sydney Basin found only six samples of intrusions into coal seams that were suitable for conventional K-Ar dating (Carr and Facer 1980). Techniques for K-Ar dating of authigenic illite, developed in response to the need by the petroleum industry to understand the timing of diagenesis in petroleum source-rocks and reservoirs, are now well established (Clauer and Chaudhuri 1995). As part of a larger project on the impact of igneous intrusions on coal mining and the alienation of coal reserves, a preliminary investigation of the timing of

Relationships of physical job tasks and living conditions with occupational injuries in coal miners

Energy Technology Data Exchange (ETDEWEB)

Ashis Bhattacherjee; Jean-Pierre Bertrand; Jean-Pierre Meyer (and others) [Indian Institute of Technology (India). Department of Mining Engineering

2007-04-15

This study assessed the relationships of job tasks and living conditions with occupational injuries among coal miners. The sample included randomly selected 516 underground workers. They completed a standardized self-administred questionnaire. The data were analyzed via logistic regression method. The rate of injuries in the past two years was 29.8%. The job tasks with significant crude relative risks were: power hammer, vibrating hand tools, pneumatic tools, bent trunk, awkward work posture, heat, standing about and walking, job tasks for trunk and upper/lower limbs, pain caused by work, and muscular tiredness. Logistic model shows a strong relationship between the number of job tasks (JT) and injuries and significant ORs=1.71 for face work, not-good-health-status, and psychotropic drug use. Musculoskeletal disorders and certain personality traits were also significant in univariate analysis. Therefore job tasks and living conditions strongly increase the injuries, and occupational physicians could help workers to find remedial measures.

The outlook for the U.S. coal industry and U.S.-Japanese coal trade

International Nuclear Information System (INIS)

Ellerman, A.D.

1988-01-01

The U.S. coal industry is stable and efficient, and in good position to respond to any increase in export demand over the next ten years. After the 1973 and 1978--79 oil price increases and the resulting growth in world demand for coal, the industry responded with extensive investment in coal mines; the transportation industry similarly made large investments in coal handling equipment and port facilities. However, as a result of the expansion in world production facilities and the less than anticipated growth in coal demand, the United States now has excess capacity---in the mining, transport and port terminal industries. The coal industry's large capital investments, followed by cost cutting improvements in response to excess capacity, have paid off in greatly increased productivity. Between its low point in 1978, and 1985, average tons per miner-hour grew by 55 percent, or at an average annual rate of 6.4 percent. This gain has been passed on to coal customers in the form of lower prices. Between 1976 and 1985, FOB mine prices in constant dollars declined by 26.9 percent, or at a rate of 3.4 percent per year; the trend continued in 1986 with an additional 4.8 percent price decline

30 CFR 75.1107-11 - Extinguishing agents; requirements on mining equipment employed in low coal.

Science.gov (United States)

2010-07-01

... equipment employed in low coal. 75.1107-11 Section 75.1107-11 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE SAFETY AND HEALTH MANDATORY SAFETY STANDARDS-UNDERGROUND COAL MINES... § 75.1107-11 Extinguishing agents; requirements on mining equipment employed in low coal. On mining...

Characterization of products of combustion of mineral coal

International Nuclear Information System (INIS)

Pinheiro, H.S.; Albuquerque, J. S. V.; Sales, J.C.; Nogueira, R.E.F.Q.

2011-01-01

During the burning of coal in power plants, various types of waste or by products are generated. These materials have been the subject of several studies. They contain ashes and have many technological applications, such as in the production of various types of ceramic pieces. The objective of this work was to study the feasibility of adding the coal combustion products as filler for ceramics. X-ray fluorescence analysis was used to identify and quantify the proportions of the elements contained in the sample and x-ray diffraction to identify the phases present. The analysis by X-ray diffraction revealed a diffraction pattern of silicon sulfide, calcium silicate and sulfide phases of Aluminium, Potassium and Titanium. X-ray fluorescence analysis showed silica (37.14%), calcium (21.86%), aluminum (14.69%) and sulfur (8.70%). These results show characteristics of materials with potential for incorporation in ceramic bodies, provided that some processing is done to eliminate the sulfur. (author)

78 FR 72717 - Division of Coal Mine Workers' Compensation; Proposed Collection; Comment Request

Science.gov (United States)

2013-12-03

... DEPARTMENT OF LABOR Office of Workers' Compensation Programs Division of Coal Mine Workers... proposed collection: Comparability of Current Work to Coal Mine Employment (CM-913). A copy of the proposed...., provides for the payment of benefits to coal miners who are totally disabled by black lung disease arising...

Proceedings of the 11th international conference on coal science

Energy Technology Data Exchange (ETDEWEB)

NONE

2001-07-01

The theme of the conference was 'Exploring the horizons of coal'. The proceedings include 370 papers dealing with coal petrography, physical structure and properties, advanced characterization, oxidation and weathering, coal preparation and beneficiation, liquefaction and pyrolysis reactivity and products, combustion and combustion modeling, NOx, SO{sub x} and particulate emissions and controls, gasification fundamentals and processing, coal in iron making processes, chemistry of S, N, and Cl, mineral matter, trace elements and HAPS, chemicals, carbons and carbon products, coal combustion byproducts and ash chemistry, and greenhouse gases and sequestration. Although 'proceedings' are published, the conference was cancelled.

Proceedings of XXIV international mineral processing congress

Energy Technology Data Exchange (ETDEWEB)

Wang Dianzuo; Sun Chuan Yao; Wang Fu Liang; Zhang Li Cheng; Han Long (eds.)

2008-07-01

Topics covered in volume 1 include applied mineralogy, comminution, classification, physical separation, flotation chemistry, sulphide flotation, non-sulphide flotation and reagent in mineral industry. Volume 2 covers processing of complex ores, processing of industrial minerals and coal, solid liquid separation, dispersion and aggregation, process simulation, expert systems and control of mineral processing, biohydrometallurgy, and mineral chemical processing. Volume 3 contains powder technology, mineral materials, treatment and recycling for solid wastes, waste water treatment, secondary resource recovery, soil remediation, concentrator engineering and process design, and application of mineral processing in related industry. It includes a CD-ROM of the proceedings.

Application of automated image analysis to coal petrography

Science.gov (United States)

Chao, E.C.T.; Minkin, J.A.; Thompson, C.L.

1982-01-01

The coal petrologist seeks to determine the petrographic characteristics of organic and inorganic coal constituents and their lateral and vertical variations within a single coal bed or different coal beds of a particular coal field. Definitive descriptions of coal characteristics and coal facies provide the basis for interpretation of depositional environments, diagenetic changes, and burial history and determination of the degree of coalification or metamorphism. Numerous coal core or columnar samples must be studied in detail in order to adequately describe and define coal microlithotypes, lithotypes, and lithologic facies and their variations. The large amount of petrographic information required can be obtained rapidly and quantitatively by use of an automated image-analysis system (AIAS). An AIAS can be used to generate quantitative megascopic and microscopic modal analyses for the lithologic units of an entire columnar section of a coal bed. In our scheme for megascopic analysis, distinctive bands 2 mm or more thick are first demarcated by visual inspection. These bands consist of either nearly pure microlithotypes or lithotypes such as vitrite/vitrain or fusite/fusain, or assemblages of microlithotypes. Megascopic analysis with the aid of the AIAS is next performed to determine volume percentages of vitrite, inertite, minerals, and microlithotype mixtures in bands 0.5 to 2 mm thick. The microlithotype mixtures are analyzed microscopically by use of the AIAS to determine their modal composition in terms of maceral and optically observable mineral components. Megascopic and microscopic data are combined to describe the coal unit quantitatively in terms of (V) for vitrite, (E) for liptite, (I) for inertite or fusite, (M) for mineral components other than iron sulfide, (S) for iron sulfide, and (VEIM) for the composition of the mixed phases (Xi) i = 1,2, etc. in terms of the maceral groups vitrinite V, exinite E, inertinite I, and optically observable mineral

Mineral industry statistics 1975

Energy Technology Data Exchange (ETDEWEB)

1978-01-01

Production, consumption and marketing statistics are given for solid fuels (coal, peat), liquid fuels and gases (oil, natural gas), iron ore, bauxite and other minerals quarried in France, in 1975. Also accident statistics are included. Production statistics are presented of the Overseas Departments and territories (French Guiana, New Caledonia, New Hebrides). An account of modifications in the mining field in 1975 is given. Concessions, exploitation permits, and permits solely for prospecting for mineral products are discussed. (In French)

Investigation on the activation of coal gangue by a new compound method.

Science.gov (United States)

Li, Chao; Wan, Jianhua; Sun, Henghu; Li, Longtu

2010-07-15

In order to comprehensively utilize coal gangue as the main raw material in cementitious materials, improving its cementitious activity is a question of fundamental importance. In this paper, we present a new compound mechanical-hydro-thermal activation (CMHTA) technology to investigate the activation effect of coal gangue, and the traditional mechanical-thermal activation (TMTA) technology was used as reference. The purpose of this study is to give a detailed comparison between these two methods with regard to the mineral composition, crystal structure and microstructure, by XRD, IR, MAS NMR, XPS and mechanical property analysis. The prepared coal gangue based blended cement, containing 52% of activated coal gangue C (by CMHTA technology), has a better mechanical property than activated coal gangue T (by TMTA technology) and raw coal gangue. The results show that both of the TMTA and CMHTA technologies can improve the cementitious activity of raw gangue greatly. Moreover, compared with TMTA, the mineral phases such as feldspar and muscovite in raw coal gangue were partially decomposed, and the crystallinity of quartz decreased, due to the effect of adding CaO and hydro-thermal process of CMHTA technology. 2010 Elsevier B.V. All rights reserved.

Effect of mechanical and chemical clay removals by hydrocyclone and dispersants on coal flotation

Energy Technology Data Exchange (ETDEWEB)

Oats, W.J.; Ozdemir, O.; Nguyen, A.V. [University of Queensland, Brisbane, Qld. (Australia). School of Chemical Engineering

2010-04-15

Fine minerals, mostly clays, are known to have a detrimental effect on coal flotation. This paper focuses on the effect of mechanical and chemical removals of fine minerals by hydrocyclone and dispersants on coal flotation. The experimental results showed that the flotation recovery slightly increased from medium acidic to medium alkaline ranges. The flotation experiments carried out with dispersants at different dosages showed that the dispersants did not enhance the flotation recovery significantly. However, the removal of the fine fraction from the feed using a hydrocyclone significantly increased the flotation recovery. The bubble-particle attachment tests also indicated that the attachment time between an air bubble and the coal particles increased in the presence of clay particles. These attachment time results clearly showed that the clay particles adversely affected the flotation of coal particles by covering the coal surfaces which reduced the efficiency of bubble-coal attachment. An analysis based on the colloid stability theory showed that the clay coating was governed by the van der Waals attraction and that the double-layer interaction played a secondary role. It was also concluded that the best way to increase the flotation recovery in the presence of clays was to remove these fine minerals by mechanical means such as hydrocylones.

Atomic absorption spectrophotometry for the determination of metallic impurities in coal

International Nuclear Information System (INIS)

Silva, M.J.S.F. da.

1983-06-01

The Brazilian Energetic Alternative Program expects the reduction of our dependence on foreign energy sources, through replacing fuel oil by mineral coal. Its gasification by means of nuclear energy must be also considered. However, the intensive burning of coal leads to serious environmental problems. During its combustion the release, to atmosphere, of toxic elements such as As, Hg, Pb, Sb, Se, Cd, Zn and others is of great concern. Increase in atmospheric pollution will take place by burning increased amounts of coal. In addition, some of those elements are concentrated in fly ashes. The determination of impurities in coal is also important for the Figueiras Project in the Nuclebras Mineral Prospection Program. Hence, it is important to have reliable analytical methods which can monitor inorganic constituents at various stages of coal production and utilization. The atomic absorption spectrophotometry is a suitable analytical technique to determine pollutants in coal because it is sensitive, simple, economic and cover a large range of concentrations. The need of a previous treatment of the sample is overcome by using an acid attack (HNO 3 + HClO 4 + HF) which has proved to be rapid and efficient. (Author) [pt

Assessment of pneumoconiosis hazards associated with mining operations in coal mines. [USSR

Energy Technology Data Exchange (ETDEWEB)

Sukhanov, V V; Menyailo, N I; Petul' ko, S N

1984-07-01

Methods are discussed for evaluating hazards of pneumoconiosis in underground coal mines. Pneumoconiosis hazards are decisively influenced by: content of respirable dusts in mine air at a working place, dust composition, temperature and time of a miner's contact with dusts. The following classification of pneumoconiosis hazards is used in the USSR: low hazards when a miner is endangered by pneumoconiosis after 20 years or more, medium hazards when pneumoconiosis may occur after 10 to 20 years, high pneumoconiosis hazards when a miner is endangered by pneumoconiosis after less than 10 years of contact with dusts. High air temperature in deep coal mines increases pneumoconiosis hazards: when temperature exceeds 26 C a temperature increase of 1 C causes a 10% increase in dust chemical activity. Safety standards which describe the maximum permissible dust level in coal mine air in the USSR, the FRG, France and Poland are compared.

Natural radionuclides in coal and waste material originating from coal fired power plant

International Nuclear Information System (INIS)

Marovic, Gordana; Franic, Zdenko; Sencar, Jasminka; Petrinec, Branko; Bituh, Tomislav; Kovac, Jadranka

2008-01-01

This paper presents long-term investigations of natural radioactivity in coal, used for power production in the coal-fired power plant (CFPP) situated on the Adriatic coast, and resulting slag and ash. Activity concentrations of 40 K, 232 Th, 226 Ra and 238 U in used coal and resulting waste material have been measured for 25 years. As expected, it was demonstrated that the content of radionuclides in deposited bottom and filter ash material are closely related with radionuclide activity concentrations and mineral matter fraction in used coals. The external hazard index has been calculated and discussed for the slag and ash depository. During the first decade of operation of the CFPP has been used domestic coal produced in nearby area characterized by higher background radiation compared with the rest of Croatia. Therefore, the coal itself had relatively high 226 Ra and 238 U activity concentrations while potassium and thorium content was very low, 40 K activity concentrations being 2-9% and those of 232 Th 1-3% of total activity. As, in addition, the sulphur concentrations in coal were very high use of domestic coal was gradually abandoned till it was completely substituted by imported coal originated from various sources and of low natural radioactivity. Upon this, activity concentrations of uranium series radionuclides in deposited waste materials decreased significantly. Consequently, waste material i.e., slag and ash, generated in the last several years of coal fired power plant operation could be readily used in cement industry and as additive to other building materials, without any special restrictions according to the Croatian regulations dealing with building materials and European directives. (author)

Drainage from coal mines: Chemistry and environmental problems

International Nuclear Information System (INIS)

Wildeman, T.

1991-01-01

Much of the research on coal-mine drainage chemistry was conducted a decade ago, and now increased environmental awareness has brought about renewed interest in the findings. Consideration of the trace minerals and elements in coal points to the possible generation of acidic waters upon weathering, especially when pyrite is present. When pyrite weathers, it produces H + and Fe 3+ which catalyze the incongruent weathering of other carbonates and sulfides. In this weathering mechanism, catalysis by bacteria is important. Of the environmental problems in coal mine drainage, the mineral acidity of the water is the most serious. This is caused not only by the H + , but also by Mn 4+ , Fe 3+ , and Al 3+ that are found or generated within the drainage. Case studies in Kentucky, Pennsylvania, Illinois, and Colorado show that the abundance and form of pyrite in the deposit and in the overburden determines the level of acidity and the concentration of heavy metal pollutants in the drainage. Recent trends in environmental enforcement that emphasize integrated stream water standards and biotoxicity assays point to the possibility that the concentrations of heavy metals in coal mine drainages may cause environmental concern

Characterization of Moroccan coal waste: valorization in the elaboration of the Portland clinker

Directory of Open Access Journals (Sweden)

Belkheiri D.

2014-04-01

Full Text Available Coal exploited in the mine of Jerada (northeast of Morocco was accompanied by large quantities of waste. The purpose of this work is to characterize this waste with the aim of its use as a material for civil engineering. Mineral and chemical investigations on this waste in the raw state, and at different temperature of heat treatments, were carried out by various methods: X-ray fluorescence, X-ray diffraction, infrared spectroscopy. These analyzes showed that the studied waste, contain essentially a mineral part formed by silica and various clays, as well as coal’s residues. The thermal investigation of waste, by differential scanning calorimetry (DSC, revealed an exothermic phenomenon attributed to the combustion of coal residues. Other phenomena were noted on the thermograms due to the mineral part transformations. In this analysis a comparison was also made with pure coal. These characteristics of coal waste encourage studying its development in reducing energy consumption in the Portland cement manufacture. Mixtures of waste with limestone or with raw cement materials were studied, and the resulting products were analyzed by different methods.

Structural characteristics and gasification reactivity of chars prepared from K{sub 2}CO{sub 3} mixed HyperCoals and coals

Energy Technology Data Exchange (ETDEWEB)

Atul Sharma; Hiroyuki Kawashima; Ikuo Saito; Toshimasa Takanohashi [National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan). Advanced Fuel Group

2009-04-15

HyperCoal is a clean coal with mineral matter content <0.05 wt %. Oaky Creek (C = 82%), and Pasir (C = 68%) coals were subjected to solvent extraction method to prepare Oaky Creek HyperCoal, and Pasir HyperCoal. Experiments were carried out to compare the gasification reactivity of HyperCoals and parent raw coals with 20, 40, 50 and 60% K{sub 2}CO{sub 3} as a catalyst at 600, 650, 700, and 775{sup o}C with steam. Gasification rates of coals and HyperCoals were strongly influenced by the temperature and catalyst loading. Catalytic steam gasification of HyperCoal chars was found to be chemical reaction controlled in the 600-700{sup o}C temperature range for all catalyst loadings. Gasification rates of HyperCoal chars were found to be always higher than parent coals at any given temperature for all catalyst loadings. However, X-ray diffraction results showed that the microstructures of chars prepared from coals and HyperCoals were similar. Results from nuclear magnetic resonance spectroscopy show no significant difference between the chemical compositions of the chars. Significant differences were observed from scanning electron microscopy images, which showed that the chars from HyperCoals had coral-reef like structures whereas dense chars were observed for coals. 26 refs., 8 figs., 2 tabs.

30 CFR 816.83 - Coal mine waste: Refuse piles.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal mine waste: Refuse piles. 816.83 Section... ACTIVITIES § 816.83 Coal mine waste: Refuse piles. Refuse piles shall meet the requirements of § 816.81, the... drainage may not be diverted over the outslope of the refuse piles. Runoff from the areas above the refuse...

30 CFR 817.83 - Coal mine waste: Refuse piles.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Coal mine waste: Refuse piles. 817.83 Section... ACTIVITIES § 817.83 Coal mine waste: Refuse piles. Refuse piles shall meet the requirements of § 817.81, the... drainage may not be diverted over the outslope of the refuse pile. Runoff from areas above the refuse pile...

Characterization of Santa Catarina (Brazil) coal with respect to human health and environmental concerns

Science.gov (United States)

Silva, L.F.O.; Oliveira, M.L.S.; Boit, K.M.; Finkelman, R.B.

2009-01-01

The current paper presents the concentration, distribution, and modes of occurrence of trace elements of 13 coals from south Brazil. The samples were collected in the state of Santa Catarina. Chemical analyses and the high ash yields indicate that all studied coals are rich in mineral matter, with SiO2 and Al2O3 dominating as determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES). Quartz is the main mineral species and is associated with minor levels of feldspars, kaolinite, hematite, and iron-rich carbonates. The contents of trace elements, including As, Pb, Cd, Ni, Cr, Mn, Be, V, U, Zn, Li, Cu, Tl, and Ni, in coals were determined. A comparison of ranges and means of elemental concentrations in Santa Catarina, Brazil, and world coals shows that the ranges of most elements in Santa Catarina coal are very close to the usual worldwide concentration ranges in coal. ?? Springer Science+Business Media B.V. 2008.

Application of Acidithiobacillus Ferrooxidans in coal flotation

Energy Technology Data Exchange (ETDEWEB)

Amini, E.; Hosseini, T.R.; Oliazadeh, M.; Kolahdoozan, M. [University of Queensland, Brisbane, Qld. (Australia)

2009-07-01

Bioflotation is a potential method for removing pyritic sulphur from coal. Sodium cyanide is a well-known depressant for pyrite in flotation of sulphide minerals; however, for coal this reagent is unacceptable from the environmental point of view. This study investigates an alternate to sodium cyanide, Acidithiobacillus Ferrooxidans, a nonharmful bacterial reagent as a pyrite depressant. The flotation behavior of pyrite and other gangue particles using the sodium cyanide and the Ferrooxidans is compared by applying the general first-order flotation model. The kinetic parameters extracted from the model demonstrated that the modified flotation rate of pyrite was reduced, and the selectivity between coal and gangue was improved using the bacteria. These results indicate that Acidithiobacillus Ferrooxidans has potential in removing pyritic sulfur from coal.

Coal Transition in the United States. An historical case study for the project 'Coal Transitions: Research and Dialogue on the Future of Coal'

International Nuclear Information System (INIS)

Kok, Irem

2017-01-01

This is one of the 6 country case-studies commissioned to collect experience on past coal transitions. The 6 countries are: Czech Republic, the Netherlands, Poland, Spain, UK, USA. Their role in the Coal Transitions project was to provide background information for a Synthesis Report for decision makers, and provide general lessons for national project teams to take into account in developing their coal transitions pathways for the future. Over the past decade, the US started to cut down the production and the use of coal, which was affected by unfavorable market dynamics and changing federal regulatory environment. Even before the shale gas revolution and uptake of renewables diminish the use of coal in power generation, coal communities were struggling to meet ends. The regional cost differences between producing states, such as the Appalachian and the Powder River Basins, indicates that coal-impacted communities and workers have lived through the impacts of coal transition at varying magnitudes and time periods. In the period between 2014 and 2016, we have seen the crash of major US coal companies due to declining demand for US coal domestically and internationally. Furthermore, Obama administration's climate change policies negatively impacted coal-fired power plants with additional GHG emission requirements, contributing to declining domestic demand for coal. Combined with market downturn, US coal producers already struggle to pay for high operational costs and legal liabilities under bankruptcy conditions. With under-funded state budgets, coal states are also grappling with financial exposure resulting from pension, health care and reclamation liabilities of bankrupt coal companies. In 2016, former President Obama announced the Power Plus Plan to aid coal-impacted communities and workers to prepare for a low carbon future. The federal budget plan targeted diversification of local economies, funding of health and pension funds of miners and retraining for

The chemical composition of tertiary Indian coal ash and its

Indian Academy of Sciences (India)

In Part 1 of the present investigation, 37 representative Eocene coal samples of Meghalaya, India were analyzed and their physico-chemical characteristics and the major oxides and minerals present in ash samples were studied for assessing the genesis of these coals. Various statistical tools were also applied to study ...

Coal, energy and environment: Proceedings

International Nuclear Information System (INIS)

Mead, J.S.; Hawse, M.L.

1994-01-01

This international conference held in Czechoslovakia was a bold attempt to establish working relationships among scientists and engineers from three world areas: Taiwan, the United States of America, and Czechoslovakia. The magic words unifying this gathering were ''clean coal utilization.'' For the ten nationalities represented, the common elements were the clean use of coal as a domestic fuel and as a source of carbon, the efficient and clean use of coal in power generation, and other uses of coal in environmentally acceptable processes. These three world areas have serious environmental problems, differing in extent and nature, but sufficiently close to create a working community for discussions. Beyond this, Czechoslovakia is emerging from the isolation imposed by control from Moscow. The need for each of these nations to meet and know one another was imperative. The environmental problems in Czechoslovakia are extensive and deep-seated. These proceedings contain 63 papers grouped into the following sections: The research university and its relationship with accrediting associations, government and private industry; Recent advances in coal utilization research; New methods of mining and reclamation; Coal-derived waste disposal and utilization; New applications of coal and environmental technologies; Mineral and trace elements in coal; Human and environmental impacts of coal production and utilization in the Silesian/Moravian region; and The interrelationships between fossil energy use and environmental objectives. Most papers have been processed separately for inclusion on the data base

Dewatering behaviour of ultrafine hard coal particles

Energy Technology Data Exchange (ETDEWEB)

Fischer, D.; Alizadeh, A.; Simonis, W.

1986-03-01

With decreasing particle diameter distribution the dewatering behaviour of coal gets increasingly complicated. A correlation between final moisture and content of particles below 25..mu..m in the course of centrifuging can be verified. This behaviour of the particles below 25..mu..m can be explained by the great specific surface, on the one hand, and by the distribution of the surface charge density, on the other hand. The charge density depends on the type of coal, on the minerals content and their make-up, as well as on the characteristics of the surrounding medium. The surface charge can be measured indirectly. Varying electrophoretic mobilities of the particles are observed in dependence on the type of raw material. In the neutral pH-range, minerals have a negative surface charge, while coal has a positive one. By way of adding reagents it is possible to invert the negative charges with complicated dewatering characteristics into positive charges. A similar influence will be exerted by changing the pH-value. 6 references.

A Study of Coal Miners’ Safety Psychological Elements Based on Questionnaire Survey

Directory of Open Access Journals (Sweden)

Li Zeng-bo

2016-01-01

Full Text Available During the production process, the instability of safety psychological elements of coal miners contributes to unsafe behaviors that may result in fatal accident. To search the dominant psychological elements, three types of unsafe psychology, comprising 18 unsafe psychological elements, are obtained by theoretical analysis and site survey. Then, an assessment model is established, and a matched questionnaire is applied to two large modern coal mines in Inner Mongolia Autonomous Region. Based on questionnaire survey results and analytic hierarchy process (AHP, assessment judgment matrixes are constructed, effect weight is calculated, and consistency check is conducted. The analysis results show that safety psychology elements of defective type are the dominant elements that trigger unsafe behaviors of coal miners.

Geochemistry of Toxic Elements and Their Removal via the Preparation of High-Uranium Coal in Southwestern China

Directory of Open Access Journals (Sweden)

Piaopiao Duan

2018-02-01

Full Text Available High-uranium (U coal is the dominant form of coal in Southwestern China. However, directly utilizing this resource can also harm the environment because this element is radioactive; it is, therefore, necessary to clean this kind of coal before burning. This research studied the geochemistry of toxic elements and their partitioning during the preparation of high-U coal in China. The results show that high-U coals are mainly distributed in Southwestern China and are characterized by a high organic sulfur (S content and vanadium (V-chromium (Cr-molybdenum (Mo-U element assemblage. These elements are well-correlated with one another, but are all negatively related to ash yield, indicating that all four are syngenetic in origin and associated with organic materials. A mineralogical analysis shows that U in Ganhe and Rongyang coal occurs within fine-grained anatase, clay minerals, guadarramite, and pyrite, while V occurs in clay minerals, pyrite, and dolomite, and Cr occurs in dolomite. Other elements, such as fluorine (F, lead (Pb, selenium (Se, and mercury (Hg, mainly occur in pyrite. By applying a gravity separation method to separate minerals from coal, the content of the enrichment element assemblage of V-Cr-Mo-U in Rongyang coal is still shown to be higher than, or close to, that of the original feed because this element assemblage is derived from hydrothermal fluids during syngenetic or early diagenetic phases, but other elements (beryllium [Be], F, manganese [Mn], zinc [Zn], Pb, arsenic [As], Se, Hg can be efficiently removed. Once cleaned, the coal obtained by gravity separation was subject to a flotation test to separate minerals; these results indicate that while a portion of V and Cr can be removed, Mo and U remain difficult to extract. It is evident that the two most commonly utilized industrialized coal preparation methods, gravity separation and flotation, cannot effectively remove U from coal where this element occurs in large

Mineralogical and Geochemical Compositions of the No. 5 Coal in Chuancaogedan Mine, Junger Coalfield, China

Directory of Open Access Journals (Sweden)

Ning Yang

2015-11-01

Full Text Available This paper reports the mineralogy and geochemistry of the Early Permian No. 5 coal from the Chuancaogedan Mine, Junger Coalfield, China, using optical microscopy, scanning electron microscopy (SEM, Low-temperature ashing X-ray diffraction (LTA-XRD in combination with Siroquant software, X-ray fluorescence (XRF, and inductively coupled plasma mass spectrometry (ICP-MS. The minerals in the No. 5 coal from the Chuancaogedan Mine dominantly consist of kaolinite, with minor amounts of quartz, pyrite, magnetite, gypsum, calcite, jarosite and mixed-layer illite/smectite (I/S. The most abundant species within high-temperature plasma-derived coals were SiO2 (averaging 16.90%, Al2O3 (13.87%, TiO2 (0.55% and P2O5 (0.05%. Notable minor and trace elements of the coal include Zr (245.89 mg/kg, Li (78.54 mg/kg, Hg (65.42 mg/kg, Pb (38.95 mg/kg, U (7.85 mg/kg and Se (6.69 mg/kg. The coal has an ultra-low sulfur content (0.40%. Lithium, Ga, Se, Zr and Hf present strongly positive correlation with ash yield, Si and Al, suggesting they are associated with aluminosilicate minerals in the No. 5 coal. Arsenic is only weakly associated with mineral matter and Ge in the No. 5 coals might be of organic and/or sulfide affinity.

Injury experience in coal mining, 1990

Energy Technology Data Exchange (ETDEWEB)

None

1991-01-01

This Mine Safety and Health Administration (MSHA) informational report reviews in detail the occupational injury and illness experience of coal mining in the United States for 1990. Data reported by operators of mining establishments concerning work injuries are summarized by work location, accident classification, part of body injured, nature of injury, occupation, and anthracite or bituminous coal. Related information on employment, worktime, and operating activity also is presented. Data reported by independent contractors performing certain work at mining locations are depicted separately in this report. For ease of comparison between coal mining and the metal and nonmetal mineral mining industries, summary reference tabulations are included at the end of both the operator and the contractor sections of this report.

Coal ash parameters by neutron activation

International Nuclear Information System (INIS)

Chrusciel, Edward; Chau, N.D.; Niewodniczanski, J.W.

1994-01-01

The coal parameters, ash content and ash slagging index, may be strongly related to the chemical composition of mineral impurities in coal. Based on this assumption the authors have examined the feasibility of neutron activation techniques, both as a laboratory and a well logging method, by recording induced γ-rays in the two energy intervals with the help of a scintillation γ-ray spectrometer. Results from the Upper Silesiab Coal Basin have shown that the method can be used to evaluate the ash content and ash fusion temperature, both in the laboratory and in well logging; the corresponding mean standard deviations being 1.5 wt% and 35 o C; and 3 wt% and 45 o C respectively. (author)

Injury experience in coal mining, 1992

Energy Technology Data Exchange (ETDEWEB)

Reich, R.B.; Hugler, E.C.

1994-05-01

This Mine Safety and Health Administration (MSHA) informational report reviews in detail the occupational injury and illness experience of coal mining in the United States for 1992. Data reported by operators of mining establishments concerning work injuries are summarized by work location, accident classification, part of body injured, nature of injury, occupation, and anthracite or bituminous coal. Related information on employment, worktime, and operating activity also is presented. Data reported by independent contractors performing certain work at mining locations are depicted separately in this report. For ease of comparison between coal mining and the metal and nonmetal mineral mining industries, summary reference tabulations are included at the end of both the operator and the contractor sections of this report.

Reservoir characteristics of coal-shale sedimentary sequence in coal-bearing strata and their implications for the accumulation of unconventional gas

Science.gov (United States)

Wang, Yang; Zhu, Yanming; Liu, Yu; Chen, Shangbin

2018-04-01

Shale gas and coalbed methane (CBM) are both considered unconventional natural gas and are becoming increasingly important energy resources. In coal-bearing strata, coal and shale are vertically adjacent as coal and shale are continuously deposited. Research on the reservoir characteristics of coal-shale sedimentary sequences is important for CBM and coal-bearing shale gas exploration. In this study, a total of 71 samples were collected, including coal samples (total organic carbon (TOC) content >40%), carbonaceous shale samples (TOC content: 6%-10%), and shale samples (TOC content TOC content. Clay and quartz also have a great effect on the porosity of shale samples. According to the FE-SEM image technique, nanoscale pores in the organic matter of coal samples are much more developed compared with shale samples. For shales with low TOC, inorganic minerals provide more pores than organic matter. In addition, TOC content has a positive relationship with methane adsorption capacity, and the adsorption capacity of coal samples is more sensitive than the shale samples to temperature.

Technological and economic aspects of coal biodesulfurisation.

Science.gov (United States)

Klein, J

1998-01-01

The sulfur found in coal is either part of the molecular coal structure (organically bound sulfur), is contained in minerals such as pyrite (FeS2), or occurs in minor quantities in the form of sulfate and elemental sulfur. When pyrite crystals are finely distributed within the coal matrix, mechanical cleaning can only remove part of the pyrite. It can, however, be removed by microbial action requiring only mild conditions. The process involves simple equipment, almost no chemicals, but relatively long reaction times, and treatment of iron sulfate containing process water. Different process configurations are possible, depending on the coal particle size. Coal with particle sizes of less than 0.5 mm is preferably desulfurised in slurry reactors, while lump coal (> 0.5 mm) should be treated in heaps. Investment and operating costs are estimated for different process configurations on an industrial scale. Concerning the organically bound sulfur in coal there is up to now no promising biochemical pathway for the degradation and/or desulfurisation of such compounds.

30 CFR 872.22 - How does OSM distribute and award historic coal funds?

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 3 2010-07-01 2010-07-01 false How does OSM distribute and award historic coal... TRIBES § 872.22 How does OSM distribute and award historic coal funds? (a) To be eligible to receive historic coal funds, you must meet the following criteria: (1) You must have and maintain an approved...

Depositional environments of the Hart coal zone (Paleocene), Willow Bunch Coalfield, southern Saskatchewan, Canada from petrographic, palynological, paleobotanical, mineral and trace element studies

Energy Technology Data Exchange (ETDEWEB)

Potter, J.; Beaton, A.P.; McDougall, W.J.; Nambudiri, E.M.V.; Vigrass, L.W. (University of Regina, SK (Canada). Energy Research Unit)

1991-12-01

Coal petrology, palynology, paleobotany and mineralogy of the Hart coal indicate deposition under wet, warm-temperate to subtropical climatic conditions in low-lying backswamps with fluvial channels and locally ponded areas. The coal is dominated by mixed xylitic/attrital lithotypes and by huminite macerals with secondary inertinite macerals and minor liptinite macerals. Good correlation exists between lithotypes and maceral composition. Local and vertical variations in proportions of huminites and inertinites reflect frequent fluctuations in water levels, periodic flooding, desiccation and burning of the peat. Swamps were dominated by {ital Glyptostrobus-Taxodium} forest with {ital Betula-Myrica-Alnus} communities and, locally {ital Laevigatosporites}, which are the dominant contributors to the xylite-rich lithotypes. Attrital lithotypes with abundant {ital Pandanus}, {ital Typha} and {ital Azolla} are consistent with wetter areas of a fluvial environment, including ponds and channels. Trace elements Cr, Cu, Mo, Ni, Si, Ti, U, Se, V, W, K and Th, typically associated with syngenetic minerals kaolinite, calcite and quartz, may have a volcanic source. High concentrations of Na, Ba and Ca found in organic complexes are of secondary origin and probably originate in deep source brines rather than marine surface waters. 55 refs., 11 figs., 5 tabs.

Analysis of waste coal from the enterprises of Kemerovo region as raw materials for production of ceramic materials

Science.gov (United States)

Stolboushkin, A. Yu; Akst, D. V.; Fomina, O. A.; Ivanov, A. I.; Syromyasov, V. A.

2017-09-01

The analysis of waste coal from mining enterprises of Kemerovo region as raw materials for production of building ceramics is given. The results of studies of material, chemical and mineralogical compositions of waste coal from Abashevskaya processing plant (Novokuznetsk) are presented. It was established that the chemical composition of waste coal refers to aluminosilicate raw materials with a high content of alumina and coloring oxides, the residual carbon content in the wastes is 12-25 %. According to the granulometric composition the waste coal is basically a sandy-dusty fraction with a small amount of clay particles (1-3 %). Additional grinding of coal waste and the introduction of a clay additive in an amount of up to 30 % are recommended. The results of the study of the mineral composition of waste coal are presented. Clay minerals are represented in the descending order by hydromuscovite, montmorillonite and kaolinite, minerals-impurities consist of quartz, feldspar fine-dispersed carbonates. The results of the investigation of ceramic-technological properties of waste coal, which belong to the group of moderately plastic low-melting raw materials, are given. As a result of a comprehensive study it was been established that with chemical, granulometric and mineralogical compositions waste coal with the reduced residual carbon can be used in the production of ceramic bricks.

New method for reduction of burning sulfur of coal

International Nuclear Information System (INIS)

Lyutskanov, L.; Dushanov, D.

1998-01-01

The coal pyrolysis is key phase in the the pyrolysis-combustion cycle as it provides char for combustor. The behaviour of sulfur compounds during coal pyrolysis depends on factors as rank of coal, quantity of sulfur and sulfur forms distribution in the coal, quantity and kind of mineral matter and the process conditions. The mineral content of coal may inhibit or catalyze the formation of volatile sulfur compounds. The pyrolysis itself is a mean of removing inorganic and organic sulfur but anyway a portion of it remains in the char while the other moves into the tar and gas. The aim of this study was to determine an optimal reduction of burning sulfur at the coal pyrolysis by varying parametric conditions. The pyrolysis of different kinds of coal has been studied. The samples with size particles o C at atmospheric pressure and with a heating rate of 6-50 o C min -1 . They were treated with exhaust gas and nitrogen at an addition of steam and air. The char obtained remains up to 10 min at the final temperature. The char samples cool without a contact with air. Two methods of desulfurization-pyrolysis were studied - using 9-vertical tubular reactor and 9-horizontal turning reactor. The results obtained show that at all samples there is a decrease of burning sulfur with maximal removal efficiency 83%. For example at a pyrolysis of Maritsa Iztok lignite coal the burning sulfur is only 16% in comparison with the control sample. The remained is 90% sulfate, 10% organic and pyrite traces when a mixture 'exhaust gas-water stream-air' was used. The method of desulfurization by pyrolysis could be applied at different kinds of coal and different conditions. Char obtained as a clean product can be used for generating electric power. This innovation is in a stage of patenting

Coal mining and water quality: Criciuma's case

International Nuclear Information System (INIS)

Fernandes, Lincoln

1999-01-01

The coal mining in the Santa Catarina Coal-Basin started in 1885 and since them it has been causing serious damage to the environment, specially the water resources, causing several problems like sedimentation and acidification of the rivers that supply the region, and compromising the agricultural-industry and fishery. The mining is also responsible for several professional diseases. The region was considered, in 1980, the '14th Critical Area' to the Pollution Control and Environmental Quality Conservation. Only in the beginning of the 80's, after the publication of the 917 Interministerial Resolution (July, 1982), the first official actions were taken, in order to minimize the environmental impact due to the coal mining industry. With that scenario, the region was chosen as one of the study areas of the 'National Center of Control of Mining Pollution', derived from an agreement between the Departamento Nacional de Producao Mineral - DNPM and the Japan International Cooperation Agency (JICA). The present study is part of the set of studies that have been realized in the region, with the aim of evaluating the environmental impact caused by the coal mining industry, and to suggest actions (to the miners) in order to minimize the environmental problems. This study presents a review of the occupation process of the Criciuma region, its connection to the coal industry, the progress of the mineral and environmental legislation, and the periodic monitoring of environmental parameters (physic-chemical analysis of the Mae Luzia and Sangao rivers, and the drainage from two coal mines) during the period of three years. This period began before the setting of environmental restrictions, going up to after the adoption of reclamation actions. The results allow to conclude that, during the period studied, there was no improvement in the river water characteristics, despite the adoption of reclamation actions. This behaviour may be due to the following factors: there are several

Losses in the coal supply chain

Energy Technology Data Exchange (ETDEWEB)

NONE

2012-12-15

This report examines the way coal can change as it passes along the coal chain. A great deal of the change is intended, through separation and sizing, to ensure the coal being mined matches the specification demanded by the customer. This report attempts to identify these changes and presents some of the issues faced by the coal supplier and user. Much of the change leads to a loss of mass in the coal. Some of the coal is left in the ground (intentionally and unintentionally), while elsewhere, full extraction might occur with the addition of non-coal materials from the surrounding rocks. In both cases, the mined coal often requires further processing. Coal processing by separation at preparation plants refines coal further and is where most of the mass loss occurs. Value is added by reducing ash content and improving heating value, thus providing a much more saleable product for the market. As soon as the coal leaves the mine, mass loss can occur either through natural deterioration of the fuel, through spillage or dust, or in extreme cases theft. In all cases measuring the amount of coal as it passes through the supply chain is required to verify that the coal reaching the consumer is of satisfactory quality and quantity. This can be done crudely by measuring stockpiles, to more sophisticated weighing systems at various points along the supply chain, and even measuring the volume held in a ship. Measurement is subject to error which must be minimised. Biomass needs to be processed in much the same way as coal, such as removing mineral matter and taking care in avoiding contamination.

76 FR 10070 - Division of Coal Mine Workers' Compensation; Proposed Extension of Existing Collection; Comment...

Science.gov (United States)

2011-02-23

... DEPARTMENT OF LABOR Office of Workers' Compensation Programs Division of Coal Mine Workers... Rereading (CM-933b), Medical History and Examination for Coal Mine Workers' Pneumoconiosis (CM-988), Report... interpretation of x-rays. When a miner applies for benefits, the Division of Coal Mine Workers' Compensation...

Feasibility study for a long-term follow-up in a historical cohort of Brazilian coal miners

Energy Technology Data Exchange (ETDEWEB)

Veiga, L.H.S.; Melo, V.P.; Amaral, E.C.S.; Koifman, S. [Inst. of Radioprotecao & Dosimetria, Rio de Janeiro (Brazil)

2007-09-15

The first Brazilian historical mortality cohort study on miners was conducted. The cohort consisted of 3224 workers in the underground coal mining industry in southern Brazil. This industry has been operating since 1942 without compliance with any regulatory standards, since there were no relevant national regulations. Over almost 60 years, about 5000 workers were exposed to high levels of radiation. However, later radiation exposure was significantly reduced, particularly that due to radon exposure. Recent radon concentration measurements indicated an average annual exposure to radon progeny of 2.1 WLM, ranging from 0.2 to 7.2 WLM. As radon exposure in the past was unknown, it can be suggested that mine workers have not been working safely as regards the health hazard related to radon and radon progeny exposure. The cohort inclusion criteria are as follows: (a) all male employees who had worked for at least one year at the coal mine; (b) workers with complete workplace information (underground and surface); (c) employment hiring between 1945 and 1997 and (d) the worker must have been alive on 1 January 1979. Through multiple strategies of search it was possible to follow up the members of the cohort with a success rate of 92%. This paper presents the characteristics of the study population and provides information about the feasibility of conducting a retrospective mortality study in Brazil, taking into account the methodological and logistical difficulties of conducting such a study in a developing country.

Feasibility study for a long-term follow-up in a historical cohort of Brazilian coal miners

International Nuclear Information System (INIS)

Veiga, L H S; Melo, V P; Amaral, E C S; Koifman, S

2007-01-01

The first Brazilian historical mortality cohort study on miners was conducted. The cohort consisted of 3224 workers in the underground coal mining industry in southern Brazil. This industry has been operating since 1942 without compliance with any regulatory standards, since there were no relevant national regulations. Over almost 60 years, about 5000 workers were exposed to high levels of radiation. However, later radiation exposure was significantly reduced, particularly that due to radon exposure. Recent radon concentration measurements indicated an average annual exposure to radon progeny of 2.1 WLM, ranging from 0.2 to 7.2 WLM. As radon exposure in the past was unknown, it can be suggested that mine workers have not been working safely as regards the health hazard related to radon and radon progeny exposure. The cohort inclusion criteria are as follows: (a) all male employees who had worked for at least one year at the coal mine; (b) workers with complete workplace information (underground and surface); (c) employment hiring between 1945 and 1997 and (d) the worker must have been alive on 1 January 1979. Through multiple strategies of search it was possible to follow up the members of the cohort with a success rate of 92%. This paper presents the characteristics of the study population and provides information about the feasibility of conducting a retrospective mortality study in Brazil, taking into account the methodological and logistical difficulties of conducting such a study in a developing country

Experimental formation of Pb, Sn, Ge and Sb sulfides, selenides and chlorides in the presence of sal ammoniac: A contribution to the understanding of the mineral formation processes in coal wastes self-ignition

Czech Academy of Sciences Publication Activity Database

Laufek, F.; Veselovský, F.; Drábek, M.; Kříbek, B.; Klementová, Mariana

176-177, May (2017), s. 1-7 ISSN 0166-5162 Institutional support: RVO:68378271 Keywords : coal wastes * metalloids * mineral formation * self-burning processes Subject RIV: DB - Geology ; Mineralogy OBOR OECD: Geology Impact factor: 4.783, year: 2016

Mineral potential of Malawai. 3. Mineral deposits associated with sedimentary and volcanic cover rocks: Karoo and post-Karoo (coal, uranium, industrial minerals and gemstone)

Energy Technology Data Exchange (ETDEWEB)

NONE

2009-07-01

This report was produced for the Ministry of Energy and Mines of Malawi. It gives information and maps of uranium deposits, coal deposits, coal-bed methane, natural gas and helium potential, limestone deposits and gemstones (blue agate, chalcedony and kimerlites, the primary source of diamonds). 2 figs., 2 tabs., 4 maps, 5 photos.

Genetic-industrial classification of brown coals in Serbia

Energy Technology Data Exchange (ETDEWEB)

Ercegovac, Marko [Serbian Academy of Sciences and Arts, Knez Mihailova 35, 11000 Belgrade (Serbia and Montenegro); ?ivotic, Dragana; Kostic, Aleksandar [University of Belgrade, Faculty of Mining and Geology, Djusina 7, 11000 Belgrade (Serbia and Montenegro)

2006-08-01

The petrologic, chemical and technological features of low-rank coals from nineteen of the most important basins in Serbia have been studied as part of the research project of genetic-industrial classification of low-rank coals of Serbia. Most of these features have been included as parameters of the codification system for low-rank coals. The paper discusses the main genetic, technological and supplementary parameters of the Serbian brown coals such as rank, petrographic composition, gelification degree, total moisture, ash content, sulphur content, calorific value, tar yield, the chemical composition and the thermotechnical properties of ash. The rank of brown coals from Serbia has been defined on the basis of the following parameters: random reflectance of huminite/vitrinite (R{sub r}=0.26-0.50%), total moisture (W{sup ar}=13.18-49.11%), gross calorific value (Q{sup daf}=22.3-29.2MJ/kg, dry, ash-free basis), net calorific value (Q{sup daf}=21.2-28.1MJ/kg, dry, ash-free basis). The results from the maceral analysis confirm that the humic coals, in general, are characterized by high huminite content (76.0-97.9vol.%, mineral matter free), low inertinite amount (0.7-6.3vol.%, mineral matter free), and a variable amount of liptinite (0.8-15.5vol.%, mineral matter free). It is possible to define three groups of Serbian brown coals on the basis of the primary, or genetic parameters, technological, or chemical parameters, and supplementary parameters: soft (Low-Rank C; [Economic Commission for Europe, Committee on Sustainable Energy- United Nations (ECE-UN), 1998. International Classification of in-Seam Coals. Energy 19, 41 pp.; Economic Commission for Europe, Committee on Sustainable Energy- United Nations (ECE-UN), 1999. International Codification System for Low-Rank Coals. Energy 9, 19 pp.; Economic Commission for Europe, Committee on Sustainable Energy- United Nations (ECE-UN), 2000. International Classification for Low-Rank Coals. Energy 12, 21 pp.]), dull (Low

Postsedimentary Alterations of Coal-bearing Rocks and New Factors Affecting their Quality and Ingredient Composition as Exemplified by the Akhaltsikhe Brown Coal Deposit (Georgia)

International Nuclear Information System (INIS)

Maghalashvili, G.

2008-01-01

It has been established that in the case when coal-bearing rocks are represented by bentonitic clays, coal undergoes significant alterations, for the bentonitic clays, as a strong absorbent, absorb from the coal under conditions of natural humidity part of organics (humic acids, gums and other moving composite substances) thus depleting the coal, increasing its ash content and accordingly decreasing its calorific capacity. In this case it is expedient to exploit the coal and ''black'' or organics-saturated rocks selectively. It has also been established that the organics-saturated ''black'' bentonite is an excellent organic and mineral fertilizer that has been tested by the autor in the patented man-made soil. At the same time, in the case of coal briquetting, it may be used as a bonding material. (author)

Race, class loyalty and the structure of capitalism: Coal miners in Alabama and the Transvaal, 1918-1922

Energy Technology Data Exchange (ETDEWEB)

Alexander, P. [Rand Afrikaans University, Auckland Park (South Africa). Dept. of Sociology

2004-03-15

Focusing on two major coal-industry strikes, one in Alabama (1920-1921) and one in the Transvaal (1922), this article seeks to understand why the former was biracial and the latter only involved white employees. The contrast is interesting because of its wider significance within the US and South Africa, and because of resemblances between the two cases. In Alabama, blacks and whites undertook similar work and there were cultural commonalities as well as divides, but in the Transvaal the economic and social gulf was so great that, for practical purposes, there were two working classes. In Alabama, most black miners and most white miners were free and settled, and came from similar rural areas. In the Transvaal, whilst blacks were coerced and migrated between subsistence societies and the collieries, whites were free and settled, and mostly had proletarian backgrounds. In South Africa, the regular supply of 'cheap' black labour - upon which the economy depended - was maintained by institutions created or supported by the state. It is argued, finally, that whilst the possibility of interracialism was rooted in the outcome of the Civil War, the institutionalisation of a dual working class was a product of imperialist victory in the South African War.

Petrographic characteristics and depositional environment of Miocene Can coals, Canakkale-Turkey

Energy Technology Data Exchange (ETDEWEB)

Guerdal, Guelbin; Bozcu, Mustafa [Canakkale Onsekiz Mart University, Engineering and Architecture Faculty (Turkey)

2011-01-01

In this study, petrographic examinations along with proximate, calorific value, ultimate, sulphur form and XRD analyses were performed in order to determine the coal characteristics and the depositional environment of the Miocene Can coals. Seventy coal samples were taken from cores and open pit mines. The investigated Can coals are humic coals and classified as lignite to sub-bituminous coal based on the random huminite reflectance (0.38-0.54% R{sub r}), volatile matter (45.50-62.25 wt.%, daf) and calorific value (3419-6479 kcal/kg, maf). The sulphur content of the Can coals changes from 0.30 up to 12.23 wt.%, and a broad range of ash contents was observed varying between 2.46 wt.% and 41.19 wt.%. Huminite is the most abundant maceral group (74-95 vol.% mmf) consisting of mostly humocollinite (gelinite) which is followed by relatively low liptinite (2-18 vol.% mmf) and inertinite content (2-13 vol.% mmf). In general, major mineral contents of coal samples are clay minerals, quartz, mica, pyrite and feldspar. The Can-Etili lignite basin consists of mainly volcano-clastics, fluviatile and lacustrine clastic sediments and contains only one lignite seam with 17 m average thickness. In order to assess the development of paleo-mires, coal facies diagrams were obtained from maceral composition. According to the Vegetation Index (VI) and Ground Water Index (GWI), the Can coal accumulated in inundated marsh, limnic and swamp environments under a rheotrophic hydrological regime. In general, the facies interpretations are in accordance with the observed sedimentalogical data. (author)

Modernisation of the mineral oil industry in the new Laender

International Nuclear Information System (INIS)

Schlueter, P.

1995-01-01

The structural differences between the energy economies of the two Germanies on the advent of reunification could hardly have been greater. The centralist, planned economy was oriented to autarky and therefore relied heavily on its domestic energy source of brown coal. In 1989 brown coal accounted for 68.4%, hence more than two thirds, of the Democratic Republic's total primary energy consumption of 128 million t of coal equivalent. Its corresponding share in the old Laender was only 23.5%. In the old Laender mineral oil with a share of 40% represented the prime energy source, whereas in the new Laender it accounted for only 14% of primary energy consumption. However, this small proportion in no way reflects the true significance of the mineral oil industry in the former GDR. (orig.) [de

CO2 Emission Factors for Coals

Directory of Open Access Journals (Sweden)

P. Orlović-Leko

2015-03-01

Full Text Available Emission factors are used in greenhouse gas inventories to estimate emissions from coal combustion. In the absence of direct measures, emissions factors are frequently used as a quick, low cost way to estimate emissions values. Coal combustion has been a major contributor to the CO2 flux into the atmosphere. Nearly all of the fuel carbon (99 % in coal is converted to CO2 during the combustion process. The carbon content is the most important coal parameter which is the measure of the degree of coalification (coal rank. Coalification is the alteration of vegetation to form peat, succeeded by the transformation of peat through lignite, sub-bituminous, bituminous to anthracite coal. During the geochemical or metamorphic stage, the progressive changes that occur within the coal are an increase in the carbon content and a decrease in the hydrogen and oxygen content resulting in a loss of volatiles. Heterogeneous composition of coal causes variation in CO2 emission from different coals. The IPCC (Intergovernmental Panel on Climate Change has produced guidelines on how to produce emission inventories which includes emission factors. Although 2006 IPCC Guidelines provided the default values specified according to the rank of the coal, the application of country-specific emission factors was recommended when estimating the national greenhouse gas emissions. This paper discusses the differences between country-specific emission factors and default IPCC CO2 emission factors, EF(CO2, for coals. Also, this study estimated EF(CO2 for two different types of coals and peat from B&H, on the basis fuel analyses. Carbon emission factors for coal mainly depend on the carbon content of the fuel and vary with both rank and geographic origin, which supports the idea of provincial variation of carbon emission factors. Also, various other factors, such as content of sulphur, minerals and macerals play an important role and influence EF(CO2 from coal. Carbonate minerals

Mineral content prediction for unconventional oil and gas reservoirs based on logging data

Science.gov (United States)

Maojin, Tan; Youlong, Zou; Guoyue

2012-09-01

Coal bed methane and shale oil &gas are both important unconventional oil and gas resources, whose reservoirs are typical non-linear with complex and various mineral components, and the logging data interpretation model are difficult to establish for calculate the mineral contents, and the empirical formula cannot be constructed due to various mineral. The radial basis function (RBF) network analysis is a new method developed in recent years; the technique can generate smooth continuous function of several variables to approximate the unknown forward model. Firstly, the basic principles of the RBF is discussed including net construct and base function, and the network training is given in detail the adjacent clustering algorithm specific process. Multi-mineral content for coal bed methane and shale oil &gas, using the RBF interpolation method to achieve a number of well logging data to predict the mineral component contents; then, for coal-bed methane reservoir parameters prediction, the RBF method is used to realized some mineral contents calculation such as ash, volatile matter, carbon content, which achieves a mapping from various logging data to multimineral. To shale gas reservoirs, the RBF method can be used to predict the clay content, quartz content, feldspar content, carbonate content and pyrite content. Various tests in coalbed and gas shale show the method is effective and applicable for mineral component contents prediction

National Coal Board Medical Service annual report 1981-82

Energy Technology Data Exchange (ETDEWEB)

1983-01-01

Sections report on: medical examinations and consultations; protection from health hazards, such as pneumoconiosis and other prescribed diseases; problems such as vitamin D in miners' blood, Legionnaires' disease, rehabilitation and physiotherapy, high pressure injection injuries, pump packing; National Coal Board (Coal Products) Ltd.; injuries and treatment; and nursing service. A list of staff and their publications and a supplement on occupational toxicology are included.

Minerals Industry' 97. Survey report

International Nuclear Information System (INIS)

1997-01-01

The aim of this annual survey is to provide timely and accurate financial data such as production, price movements, profitability, distribution of assets by activity, employment and labour cost and taxation on the Australian minerals industry. It aims to facilitate more informed debate on the industry's role and importance in the economy. The report also includes information on the safety and health performance and overseas exploration expenditure of the minerals industry. This twenty-first survey relates to the year ended 30 June 1997. The proportion of activity covered in this year's survey is comparable with the 1996 survey. The mineral industry is defined as including exploration for, extraction and primary processing of minerals in Australia. The oil, gas, iron and steel industries are excluded. As for the uranium industry, increased mine capacity over the medium term saw a switch away from spot market purchases to long term contracts for uranium in 1996. This, coupled with announced releases from the US stockpile, saw downward pressure on spot market prices for uranium during 1996/97. The average spot market price for U 3 O 8 fell by an average of 6 percent during 1996/97 and was approximately 16 percent lower than three years ago. General uncertainty over the future profitability of coal industry is compounded by the likely softness of future coal prices

Effect of hydrothermal treatment of coal on its associative structure

Energy Technology Data Exchange (ETDEWEB)

Shui Heng-fu; Wang Zhi-cai; Wang Gao-qiang; Niu Min-feng [Anhui University of Technology, Maanshan (China). School of Chemistry & Chemical Engineering

2006-10-15

4 bituminous coals with different ranks were thermally and hydrothermally treated under different conditions, and the raw and treated coals were extracted with carbon disulfide/N-2-pyrrolidinone (CS{sub 2}/NMP) mixed solvent (1:1 by volume). It is found that the extraction yields of the thermal or hydrothermal treated coals at proper conditions increase in different extent. The increments of extraction yields for hydrothermal treated coals are higher than those of thermal treated coals. FT-IR shows that the adsorption peaks at 3410 cm{sup -1} attributed to OH group for the hydrothermal treated coals decrease, suggesting the dissociation of the coal aggregation structure due to the breakage of hydrogen bonds, resulting in the increase of extraction yields for the treated coals. For higher rank coal, the removal of minerals and the dissociation of {pi}-cation association after hydrothermal treatment of coal may be responsible for the increase of extraction yield. In addition, the mechanism of hydrothermal treatment of coal was discussed. 15 refs., 2 figs., 5 tabs.

Application of Moessbauer spectroscopy for: (1) characterization of Egyptian Maghara coal; (2) evaluating the efficiency of different methods for coal desulphurization

International Nuclear Information System (INIS)

Eissa, N.A.; Sheta, N.H.; Ahmed, M.A.

1992-01-01

Coal has been recently discovered in Maghara mine at Northern Sinai, Egypt. Coal samples have been collected from different depths and were measured by XRD, XRF, and MS, in order to characterize this type of coal. It has been found that the iron bearing minerals are mainly pyrite and different sulphates depending on the depth of the sample. The second part contains the application of desulphurization techniques to Egyptian coal which are: floatation (one step and two steps), chemical [(HCl+HNO 3 ), and Fe 2 (SO 4 ) 3 ] and bacterial methods (Chromatium and Chlorobium species). The efficiency of each technique was calculated. A comparative discussion is given of each desulphurization method, from which the bacterial method has proved to be the most efficient one. (orig.)

Uruguay minerals fuels

International Nuclear Information System (INIS)

Goso, H.

1967-01-01

In this report the bases for the development of the necessary works of prospection are exposed on mineral fuels of Uruguay. We have taken the set from: coal, lutitas bituminous, uranium, petroleum and disturbs. In all the cases we have talked about to the present state of the knowledge and to the works that we considered necessary to develop in each case

Coal mining situation in the Federal Republic of Germany. January to September 2017

International Nuclear Information System (INIS)

2017-01-01

This publication presents statistical data on hard coal mining (production, stocks, performance per miner and shift, headcount, sales, foreign sales, imports) as well as brown coal mining (production, refining, headcount, domestic sales, imports) in Germany during the period from January through September 2017.

Tribocharging in electrostatic beneficiation of coal: Effects of surface composition on work function as measured by x-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy in air

International Nuclear Information System (INIS)

Trigwell, S.; Mazumder, M.K.; Pellissier, R.

2001-01-01

The cleaning of coal by electrostatic beneficiation is based on tribocharging characteristics of pulverized coal particles with diameter smaller than 120 μm. The tribocharging process should be such that the organic coal particles must charge with a polarity opposite to that of the sulfur and the mineral containing particles so that coal can be separated from minerals by using a charge separator. However, the charge distribution of electrostatically separated coal particles indicates that coal exhibits bipolar charging. A significant fraction of the coal particles charges negatively which appears to be in conflict with expectations in that the organic coal particles should charge positively, and the mineral particles, present as impurities such as pyrite, charge negatively when tribocharged against copper. The relative work functions of the particles (coal and mineral) and that of the metal surface (copper or stainless steel) used for tribocharging predict these expected results. However, ultraviolet photoelectron spectroscopy (UPS) measurements in air on specimens of three different coal species, showed the work function to be approximately 5.4 eV, which is higher than a reported measured work function of 3.93 eV. Studies by UPS and x-ray photoelectron spectroscopy on copper, stainless steel, aluminum, and other commonly used tribocharging materials such as nylon and polytetrafluorethylene, as well as pure pyrite, showed that the work function varied considerably as a function of surface composition. Therefore, the reason for the bipolar charging of the coal particles may be the too small differences in work functions between coal powder and copper used as the charging material. The choice of a material for impaction triboelectric charging for coal or mineral separation should therefore depend upon the actual work function as modified by the ambient conditions such as moisture content and the oxidation of the surface

Floatability characteristics: A case study with three typical Indian prime coking coals

Energy Technology Data Exchange (ETDEWEB)

Chakraborty, D.; Singh, A.K.; Banerjee, P.K. [Tata Steel Ltd., Jamshedpur (India). Division for Research & Development

2008-07-01

Three types of prime coking coals (coals A, B, and C) from Jharia coalfield, India, were investigated for the variations in their floatability characteristics. Among the three coals studied, coal A showed the least floatability. However, its floatability improved to some extent at higher dosages of collector and frother. Other two types of coal, i.e., coals B and C, showed almost similar flotation performance, which was much better as compared to coal A. The studies revealed that coal showed the least floatability characteristics, primarily due to the least concentration of vitrinite and liptinite content and a high percentage of inertinite and mineral matters in the coal. Also, the lower type of vitrinite (V7-V9) was present in the coal in greater proportion as compared to the other two coals and the proportion of ultra fines (-0.053mm) in coal A was higher as compared to the other two coals.

Petrology, Palynology, and Geochemistry of Gray Hawk Coal (Early Pennsylvanian, Langsettian in Eastern Kentucky, USA

Directory of Open Access Journals (Sweden)

James C. Hower

2015-09-01

Full Text Available This study presents recently collected data examining the organic petrology, palynology, mineralogy and geochemistry of the Gray Hawk coal bed. From the Early Pennsylvanian, Langsettian substage, Gray Hawk coal has been mined near the western edge of the eastern Kentucky portion of the Central Appalachian coalfield. While the coal is thin, rarely more than 0.5-m thick, it has a low-ash yield and a low-S content, making it an important local resource. The Gray Hawk coal palynology is dominated by Lycospora spp., and contains a diverse spectrum of small lycopods, tree ferns, small ferns, calamites, and gymnosperms. The maceral assemblages show an abundance of collotelinite, telinite, vitrodetrinite, fusinite, and semifusinite. Fecal pellet-derived macrinite, albeit with more compaction than is typically seen in younger coals, was observed in the Gray Hawk coal. The minerals in the coal are dominated by clay minerals (e.g., kaolinite, mixed-layer illite/smectite, illite, and to a lesser extent, pyrite, quartz, and iron III hydroxyl-sulfate, along with traces of chlorite, and in some cases, jarosite, szomolnokite, anatase, and calcite. The clay minerals are of authigenic and detrital origins. The occurrence of anatase as cell-fillings also indicates an authigenic origin. With the exception of Ge and As, which are slightly enriched in the coals, the concentrations of other trace elements are either close to or much lower than the averages for world hard coals. Arsenic and Hg are also enriched in the top bench of the coal and probably occur in pyrite. The elemental associations (e.g., Al2O3/TiO2, Cr/Th-Sc/Th indicate a sediment-source region with intermediate and felsic compositions. Rare metals, including Ga, rare earth elements and Ge, are highly enriched in the coal ashes, and the Gray Hawk coals have a great potential for industrial use of these metals. The rare earth elements in the samples are weakly fractionated or are characterized by heavy

Fouling deposition characteristic by variation of coal particle size and deposition temperature in DTF (Drop Tube Furnace)

Energy Technology Data Exchange (ETDEWEB)

Namkung, Hueon; Jeon, Youngshin; Kim, Hyungtaek [Ajou Univ., Suwon (Korea, Republic of). Div. of Energy Systems Research; Xu, Li-hua [IAE, Suwon (Korea, Republic of). Plant Engineering Center

2013-07-01

One of the major operation obstacles in gasification process is ash deposition phenomenon. In this investigation, experiment was carried out to examine coal fouling characteristics using a laminar DTF (Drop Tube Furnace) with variation of operating condition such as different coal size, and probe surface temperature. Four different samples of pulverized coal were injected into DTF under various conditions. The ash particles are deposited on probe by impacting and agglomerating action. Fouling grains are made of eutectic compound, which is made by reacting with acid minerals and alkali minerals, in EPMA (Electron Probe Micro-Analysis). And agglomeration area of fouling at top layer is wide more than it of middle and bottom layer. The major mineral factors of fouling phenomenon are Fe, Ca, and Mg. The deposition quantity of fouling increases with increasing particle size, high alkali mineral (Fe, Ca, and Mg) contents, and ash deposition temperature.

The effect of sedimentation background of depression target stratum containing mineral in Erlian basin, Ulanqab to uranium mineralization type

International Nuclear Information System (INIS)

Kang Shihu; Jiao Yangquan; Men Hong; Kuang Wenzhan

2012-01-01

The ore bearing stratum in depression of Ulanqab contains target stratum of lower cretaceous Saihan formation, upper cretaceous Erlian formation, paleogene system etc. The uranium mineralization type which have found by now contains sandstone type, mudstone type and coal petrography. The genetic type of mineral deposit contains paleovalley-type, reformed type after superposition with sedimentation and diagenesis by sedimentation. Uranium mineralization of both the natural type and genetic type have close relationship with its ore bearing stratum. Different geological background forms different sedimentary system combination, and different sedimentary system combination forms different uranium mineralization type. (authors)

Coal Transition in Poland. An historical case study for the project 'Coal Transitions: Research and Dialogue on the Future of Coal'

International Nuclear Information System (INIS)

Szpor, Aleksander

2017-01-01

This is one of the 6 country case-studies commissioned to collect experience on past coal transitions. The 6 countries are: Czech Republic, the Netherlands, Poland, Spain, UK, USA. Their role in the Coal Transitions project was to provide background information for a Synthesis Report for decision makers, and provide general lessons for national project teams to take into account in developing their coal transitions pathways for the future. The restructuring of the Polish coal sector is inextricably related to the democratic transformation which began in 1989. The economic dimension of the transformation is manifested in the shift from central planning to the free market. Although this process brought economic growth, it has had severe social costs. The main goals of the coal sector restructuring were to achieve its profitability and competitiveness on the global market. However, even with a very quick down-sizing of production and employment, which positively affected the mines' productivity, these goals were not achieved. Neither the profitability of the sector nor the sustainability of the labour restructuring were achieved. There were three main reasons for lack of success in this process. Firstly, the rapid changes of governments making impossible implementation of long term strategies and ensure implementation of market rules in the sector. Secondly, the pressure from trade unions on sustaining the status quo - state owed structure of mining companies, professional privileges and increasing salaries. Thirdly, the lack of sufficient incentives for retraining the miners and revitalising the areas exposed the most on the coal sector restructuring. Content: Introduction; Historical background; Structure of the coal and energy sector; Policies for the restructuring of the coal sector: Main actors in the process, Governmental programs, Instruments for easing the restructuring processes; Conclusions and lessons learnt

Influence of noxious products of blasting in mine air on miners' health

Energy Technology Data Exchange (ETDEWEB)

Zemlyakova, L F; Sukhanov, V V

1979-07-01

Changes in the percentage of carbon monoxide and nitric oxide in mine air as a result of blasting is analyzed as measured in coal mines of the Donbass in coal seams located from 500 m to 1000 m underground. It is stated that 15 minutes after blasting the concentration of carbon monoxide and nitric oxide drops to a permissible level. Fifty minutes after blasting the percentage of nitric oxide in mine air drops to such a level that it can not be detected. Carbon monoxide can be detected until the blasted rocks and coal are removed from the heading. The percentage of nitric oxide in mine air falls with growing depth of workings. The interdependence between state of miners' health and their contact with noxious gases is also analyzed. The analysis shows that miners working where blasting is used are ill more frequently than other miners, and their absence due to illness is longer. (In Russian)

Niger Republic Mineral Planning : Part IV - first volume : Main mineral substances specific study and their geological context

International Nuclear Information System (INIS)

Franconi, Antoine; Joo', Julien; Zibo, Idde

1981-01-01

This volume contains the detailed study of mineral substances industrially exploited to date : uranium, coal, non metallic building materials and public activities, and non conventionally exploited substances, that are : tin, columbite-tantalite, tungsten, gold, phosphates and evaporates [fr

Fluidized bed dry dense medium coal beneficiation

CSIR Research Space (South Africa)

North, Brian C

2017-10-01

Full Text Available medium beneficiation using a fluidized bed was investigated. Bed materials of sand, magnetite and ilmenite were used in a laboratory sized cylindrical fluidized bed. The materials were individually tested, as were mixes of sand and heavy minerals. Coal...

The Effect Of Local Coal And Smelting Sponge Iron On Iron Content Of Pig Iron

Science.gov (United States)

Oediyani, Soesaptri; Juwita Sari, Pramita; Hadi P, Djoko

2018-03-01

The new regulation on mineral resources was announced by Ministry of Energy and Mineral resources (ESDM) of Indonesia at 2014 which it called Permen ESDM No 1/2014. Therefore, this research was conducted to add the value of local iron ores by using smelting technology. The objective of the research is to produce pig iron that meet the requirement of the new regulation of mineral resources such as 90% Fe. First, iron ores and coal mixed together with lime as a flux, then smelted in a Electric Arc Furnace at 1800°C. The process variables are (1; 1.25; 1.5; 1.75; 2.0) and the composition of coal (0.8%, 1.6%, 3.0%). The type of coal that used in this research was bituminous coal from Kalimantan and also the iron ores from Kalimantan. The products of the smelting technology are Pig iron and slag. Both pig iron and slag then analyzed by SEM-EDS to measure the iron content. The result shows that the maximum iron content on pig iron is about 95.04% meanwhile the minimum iron content on slag is about 3.66%. This result achieved at 1.6% coal and 2.0.

Comparing the hazards of coal and uranium mining

International Nuclear Information System (INIS)

Bromley, J.

1987-01-01

The article from a paper presented to the Uranium Institute Symposium, London, 1986. The risk calculation is based on: a) the fuel required to generate 1 GWe year of power, b) the productivity of uranium and coal mining, and c) the risk to a miner from one year of mining, and the risk to the public that results from 1 GWe year's worth of mine and mill operation. The evaluation reveals that the ratio of coal mining risk to uranium risk on a GWey basis differs from country to country, but falls in the range 10 to 30, coal being the higher. (U.K.)

Federal coal lease readjustments: will reason prevail

Energy Technology Data Exchange (ETDEWEB)

Margolf, C W

1988-01-01

After 1920, when the US Congress passed the Mineral Lands Leasing Act (MLLA), coal owned by the Federal government could only be developed by leasing under the MLLA. Most Federally owned coal is in the west, where the Federal government enjoys a near monopoly in coal ownership and its development. In 1976, congress enacted the Federal Coal Leasing Amendments ACT (FCLAA), over President Ford's veto, in order to: increase rents and royalties on Federal coal leases; force lessees holding Federal coal leases not in production to open mines on the non-producing leases; and end 'speculation' in Federal coal leases. The book maintains that in passing the FCLAA, Congress did not understand the western coal industry, and neither did the Department of the Interior (DOI) in concluding that Congress had mandated that the FCLAA must be applied to pre-FCLAA leases, even those in production, when such leases are readjusted. In the resulting lawsuits, the western coal industry has not been explained to the Federal courts and the decisions regarding the applicability of the FCLAA upon readjustment of pre-FCLAA leases have consequently been wrong. The book examines the record to date and aims to demonstrate the validity of these conclusions. It also describes which actions the DOI should have taken to accomplish the objectives of congress set forth in the FCLAA, to readjust pre-FCLAA leases without litigation.

Investigation of pyrite as a contributor to slagging in eastern bituminous coals. Quarterly progress report 9, October 1-December 31, 1983

Energy Technology Data Exchange (ETDEWEB)

Bryers, R.W.

1984-06-01

The objective of this program is to examine slags formed as a result of firing coals with varying concentration levels, size distribution, and orientation of pyrite with regard to mineral matter in the coal in a laboratory furnace. The program tasks are: (1) selection of eight candidate coals; (2) chemical characterization of the coal samples and identification of the pyrite size, distribution, and orientation with respect to other mineral matter and concentration levels; (3) testing of the candidate coals in a laboratory furnace; (4) chemical and physical characterization of the slag and fly ash samples created by the impurities in the coal sample; (5) influence of coal beneficiation on furnace slagging; and (6) analysis of data and identification of parameters influencing the contribution of pyrite to slagging problems. Washing of the Upper Freeport coal from Indiana County, Pennsylvania, was completed by the last quarter of 1983. The washed product was characterized for mineral content, and a combustion test was performed. Kentucky No. 9 from Henderson County, Kentucky, selected as the sixth coal to be investigated, was characterized using size and gravity fractionation techniques and was combusted in the laboratory furnace to evaluate its slagging and fouling potential. The remaining two coals to be characterized and combusted were identified as Illinois No. 5 and Lower Kittanning from Clarion County, Pennsylvania. 80 figures, 27 tables.

Canadian minerals yearbook : 2004 review and outlook

International Nuclear Information System (INIS)

2004-01-01

The main focus of the CMY publication is the non-fuel mineral industry, together with uranium, although all mineral fuels are normally included when the total value of Canada's mineral production is reported. The Yearbook includes chapters devoted to each major mineral commodity produced in Canada: aluminum, coal, copper, diamonds, gold, iron ore, magnesium, nickel, potash, salt, silica, and uranium. The subject matter spans all stages of mineral industry activity from geoscience and exploration, through mining and processing, to markets and use. Although domestic issues receive the greatest attention in each chapter, international developments may also be reviewed because of the global nature of the mineral industry and the significant impact that such developments could have on the Canadian industry

The Research on the Impact of Management Level's Charismatic Leadership Style on Miners' Unsafe Behavior.

Science.gov (United States)

Li, Hongxia; Di, Hongxi; Tian, Shuicheng; Li, Jian

2015-01-01

The aim of this study is research the impact of management level's charismatic leadership style on miners' unsafe behavior by using the questionnaires on charismatic leadership style, safety attitude and the miners' unsafe behavior measurement to investigate 200 employees in Shen Dong Company. The research results suggest that management level's charismatic leadership style have very important influence on miners' unsafe behavior and the influence is affected by the safety attitude which is the intermediary function. In the end, this study propose advice on how to improve the coal mine enterprise managers charismatic leadership style in the coal mine enterprise's safety management work, including attach great importance to a variety of incentive methods, set up safety moral models, practice of inductive leadership concept, create a good atmosphere of safety, etc for reference for coal mining enterprises.

The production of activated carbon from nigerian mineral coal via steam activation

International Nuclear Information System (INIS)

Nwosu, F.O.; Owolabi, B.I.O.; Adebowale, O.

2010-01-01

Activated carbon was produced from Okpara sub-bituminous coal and Ogwashi brown lignite coal of Nigeria through steam activation at 900 degree C and 960 degree C each for 30 min and 60 min. Okpara and Ogwashi precursor coals had carbon content of 67.41 and 64.47%, respectively, whereas the bulk density and the ash content were 0.59 - 0.68 g/mL and 2.56-9.91%, respectively. The former exhibited up to 901.0 mg/g iodine number and Brunauer Emmett Teller (BET) surface area of 604 m/sup 2/g while the latter, iodine number of 998.0 mg/g and 669 m/sup 2/g BET surface area. Both showed adequate porosity indicative of their potential for utilization for commercial production of active carbons. (author)

The Economic Importance of Mineral Production in Iran, Pakistan and Turkey in View of Co-operation in Mineral Exports and Interregional Trade*

Directory of Open Access Journals (Sweden)

Zeki Doğan

1968-06-01

Full Text Available Possibilities of co-operation are discussed regarding exports of mineral commodities, namely, chromite and marble which are produced by the three regional countries.  In order to improve the opportunities for the regional trade among Iran, Pakistan and Turkey, the following minerals can offer potentialities: coking coal, sulphur, barite, bentonite, magnesite, lead and zinc ores and boron minerals, which are in short supply in one country and abundant in another.

Processing of uranium-containing coal

International Nuclear Information System (INIS)

Cordero Alvarez, M.

1987-01-01

A direct storage of uranium-bearing coal requires the processing of large amounts of raw materials while lacking guarantee of troublefree process cycles. With the example of an uranium-bearing bituminous coal from Stockheim, it was aimed at the production of an uranium ore concentrate by means of mechanical, thermal and chemical investigations. Above all, amorphous pitch blende was detected as a uranium mineralization which occurs homogeneously distributed in the grain size classes of the comminuted raw material with particle diameters of a few μm and, after the combustion, enriches in the field of finest grain of the axis. Heterogeneous and solid-state reactions in the thermal decarburization above 700deg C result in the development of hardly soluble uranium oxides and and calcium uranates as well as in enclosures in mineral glass. Thus, the pre-enrichment has to take place in a temperature range below 600deg C. By means of a sorting classification of the ash at ± 2.0 mm, it is possible to achieve an enrichment of up to factor 15 for a mineral of a mainly low carbonate content and, for a mineral of a rich carbonate content, up to the factor 4. The separation of the uranium from the concentrates produced is possible with a yield of 95% by means of leaching with sulphuric acid at a temperature of 20deg C. As far as their reproducibility was concerned, the laboratory tests were verified on a semi-industrial scale. A processing method is suggested on the basis of the data obtained. (orig.) [de

Energy generation potential from coals of the Charqueadas Coalfield, RS, Brazil

Science.gov (United States)

Correa da Silva, Z. C.; Heemann, R.; Castro, L.; Ketzer, J. M.

2009-04-01

Three coal seams, I2B (Inferior 2), I1F (Inferior 1) and MB, from the Charqueadas Coalfield located in the central-east region of the State of Rio Grande do Sul, Southern Brazil were studied on the basis of geological, petrographic, chemical and geochemical techniques and correlated to the SR1, SR2 and SR3 coal seams from the Santa Rita Coalfield. The Charqueadas Coalfield reserves reach 2,993x106 metric tons of coal distributed in six coal seams. The study of sedimentary and organic facies is made on the subsurface data from five boreholes drilled in the area. There show a well marked lateral facies change from sub aquatic to sub aerial environment, conditioned by both the water level variations and the irregular palaeotopography of the basement. The coals change from limnic to forest-terrestrial moor types characterized by variations of composition in terms of macerals, microlithotypes and mineral matter. The coals are rich in mineral matter (28 to 40%); the vitrinite content reaches 50 %, inertinite 44 % and liptinite varies from 10 to 30 %, in mineral matter free basis. Among the microlithotypes carbominerite and vitrite are predominant. Rank studies carried out by different methods (vitrinite reflectance, max and red-green quotient among others) gave conflicting results, which are explained by the strong bituminization of the vitrinite. However, agreement between fluorescence measurements and organic geochemical parameters (e.g. CPI values) confirm that the coals are of a High Volatile Bituminous B/C (ASTM) or Gasflammkohle (DIN) rank. Based on these characteristics, the Charqueadas coal seams show great potential for use in Underground Coal Gasification (UCG) and Enhanced Coalbed Methane (ECBM) projects. Nowadays the state of Rio Grande do Sul is rapidly growing and needs to increase the energy efficiency to attend the industrial demands, filling the gap between supply and energy generation. As with conventional IGCC, UCG gas can be used to generate

Deashing of coal liquids with ceramic membrane microfiltration and diafiltration

Energy Technology Data Exchange (ETDEWEB)

Bishop, B.; Goldsmith, R. [CeraMem Corp., Waltham, MA (United States)

1995-12-31

Removal of mineral matter from liquid hydrocarbons derived from the direct liquefaction of coal is required for product acceptability. Current methods include critical solvent deashing (Rose{sup {reg_sign}} process from Kerr-McGee) and filtration (U.S. Filter leaf filter as used by British Coal). These methods produce ash reject streams containing up to 15% of the liquid hydrocarbon product. Consequently, CeraMem proposed the use of low cost, ceramic crossflow membranes for the filtration of coal liquids bottoms to remove mineral matter and subsequent diafiltration (analogous to cake washing in dead-ended filtration) for the removal of coal liquid from the solids stream. The use of these ceramic crossflow membranes overcomes the limitations of traditional polymeric crossflow membranes by having the ability to operate at elevated temperature and to withstand prolonged exposure to hydrocarbon and solvent media. In addition, CeraMem`s membrane filters are significantly less expensive than competitive ceramic membranes due to their unique construction. With these ceramic membrane filters, it may be possible to reduce the product losses associated with traditional deashing processes at an economically attractive cost. The performance of these ceramic membrane microfilters is discussed.

Chemical characterization of bottom ashes generated during combustion of a Colombian mineral coal in a thermal power plant; Caracterizacao quimica das cinzas de fundo originadas pela combustao, em usina termoeletrica, de um carvao mineral do nordeste da Colombia

Energy Technology Data Exchange (ETDEWEB)

Pinheiro, H.S.; Nogueira, R.E.F.Q.; Lobo, C.J.S.; Nobre, A.I.S.; Sales, J.C.; Silva, C.J.M., E-mail: hspfisica@hotmail.com [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Centro de Tecnologia. Dept. de Engenharia Metalurgica e de Materiais

2012-07-01

Bottom ashes generated during combustion of a mineral coal from Colombia were characterized by X-ray fluorescence spectrometry and X-ray diffraction. The interest in this particular coal is due to the fact that it will be used by a thermal power plant in Ceara, Northeastern Brazil, where it could produce over 900 tons of different residues/combustion products every day. Results from Xray fluorescence allowed identification and quantification of elements present in the sample: silicon (59,17%), aluminum (13,17%), iron (10,74%), potassium (6,11%), titanium (2,91%), calcium (4,97%), sulphur (0,84%) and others (2,09%). The X-ray diffraction revealed patterns from silica, mullite, calcium sulphate and hydrated sodium. Results obtained so far indicate that the material is a potential raw-material for use in the formulation of ceramic components (author)

Performance of underground coal mines during the 1976 Tangshan earthquake

Energy Technology Data Exchange (ETDEWEB)

Lee, C.F.

1987-01-01

The Tangshan earthquake of 1976 costs 242 000 lives and was responsible for 164 000 serious injuries and structural damage of immense proportion. The area has eight coal mines, which together form the largest underground coal mining operation in China. Approximately 10 000 miners were working underground at the time of the earthquake. With few exceptions they survived and returned safely to the surface, only to find their families and belongings largely destroyed. Based on a comprehensive survey of the miners' observations, subsurface intensity profiles were drawn up. The profiles clearly indicated that seismic damage in the underground mines was far less severe than at the surface. 16 refs., 4 figs., 2 tabs.

Structure and pozzolanic activity of calcined coal gangue during the process of mechanical activation

Energy Technology Data Exchange (ETDEWEB)

Wei Guo; Dongxu Li; Jianhua Chen; Nanru Yang [Yancheng Institute of Technology, Yancheng (China). Department of Material Engineering

2009-04-15

On the basis of analyzing coal gangue's chemical and mineral compositions, the structure change of coal gangue during the mechanical activation was investigated by XRD, FTIR, NMR, and the mechanical strength of the cement doped coal gangue with various specific surface area was tested. The experimental results indicate that the lattice structure of metakaolin in coal gangue samples calcined at 700{sup o}C disorganizes gradually and becomes disordered, and the lattice structure of {alpha}-quartz is distorted slightly. The pozzolanic activity of the coal gangue increases obviously with its structural disorganization.

77 FR 55420 - Minerals Management: Adjustment of Cost Recovery Fees

Science.gov (United States)

2012-09-10

... mining, oil and gas extraction, and the mining and quarrying of nonmetallic minerals) as an individual...\\ New value \\4\\ New fee \\5\\ Oil & Gas (parts 3100, 3110, 3120, 3130, 3150) Noncompetitive lease... Leasing of Solid Minerals Other Than Coal and Oil Shale (parts 3500, 3580) Applications other than those...

76 FR 54163 - Proximity Detection Systems for Continuous Mining Machines in Underground Coal Mines

Science.gov (United States)

2011-08-31

... Detection Systems for Continuous Mining Machines in Underground Coal Mines AGENCY: Mine Safety and Health... (except full-face continuous mining machines) with proximity detection systems. Miners working near..., each underground coal mine operator would be required to install proximity detection systems on...

Underground gasification of coal - possibilities and trends

International Nuclear Information System (INIS)

Dushanov, D.; Minkova, V.

1994-01-01

A detailed historical review is given on the problem of underground coal gasification (UCG) with emphasis on its physical, chemical, technological and financial aspects. The experience of USA, Japan, former USSR, Belgium, UK and France is described. The feasibility of UCG in the Dobrudzhan Coal Bed in Bulgaria is discussed. The deposit has reserves of about 1.5 billion tones at relatively shallow depths. Almost the whole scale from long flame to dry coal is covered. According to its coalification degree the bed belongs to gas coal - V daf 35-40%; C daf 80-83%, eruption index = 1. Enriched samples has low sulfur content - 0.6-1.5% and low mineral content - 6-12%. Having in mind the lack of domestic natural gas and petroleum resources, the authors state that the utilisation of the bed will alleviate the energy problems in Bulgaria. 24 refs., 5 figs., 1 tab

Regulations implementing the Byrd Amendments to the Black Lung Benefits Act: determining coal miners' and survivors' entitlement to benefits. Final rule.

Science.gov (United States)

2013-09-25

This final rule revises the Black Lung Benefits Act (BLBA or Act) regulations to implement amendments made by the Patient Protection and Affordable Care Act (ACA). The ACA amended the BLBA in two ways. First, it revived a rebuttable presumption of total disability or death due to pneumoconiosis for certain claims. Second, it reinstituted automatic entitlement to benefits for certain eligible survivors of coal miners whose lifetime benefit claims were awarded because they were totally disabled due to pneumoconiosis. These regulations clarify how the statutory presumption may be invoked and rebutted and the application and scope of the survivor-entitlement provision. The rule also eliminates several unnecessary or obsolete provisions.

Underground roadway drivage with heading machines in Indian coal industry

Energy Technology Data Exchange (ETDEWEB)

Mukherjee, T.K.

1983-03-01

Heading machines have assumed a very important place in underground roadway drivage. They are not only a compromise between ''drill-and-blast'' technique and full-face machines, but are also an economic and versatile form of mechanised roadway drivage. Since the advantages gained by heading machines are considerable, the use of these machines is becoming popular in underground roadway drivage. Experience with continuous miner and heading machines in Indian coal mines is very limited compared to that of Western countries. In 1964-65, for the first time, two units of Lee Norse Miner were used at Kunostoria Colliery of Bengal Coal Company. In 1966, two units of Joy Continuous Miner were introduced at Chalkari Colliery of National Coal Development Corporation, but had to be adandoned because of heavy make of water at the installation site. A Russian PK-3 heading machine was used limitedly during the development of Banki Colliery, Madhya Pradesh. A Demag Unicorn VS-1 machine operated for the development of roadways at Jitpur and Chasnala Collieries of IISCO between 1967-70. With this machine, progress of 7 m per day was attained in level roadways and of about 2 m per day in steep raises.

Method selection for mercury removal from hard coal

Directory of Open Access Journals (Sweden)

Dziok Tadeusz

2017-01-01

Full Text Available Mercury is commonly found in coal and the coal utilization processes constitute one of the main sources of mercury emission to the environment. This issue is particularly important for Poland, because the Polish energy production sector is based on brown and hard coal. The forecasts show that this trend in energy production will continue in the coming years. At the time of the emission limits introduction, methods of reducing the mercury emission will have to be implemented in Poland. Mercury emission can be reduced as a result of using coal with a relatively low mercury content. In the case of the absence of such coals, the methods of mercury removal from coal can be implemented. The currently used and developing methods include the coal cleaning process (both the coal washing and the dry deshaling as well as the thermal pretreatment of coal (mild pyrolysis. The effectiveness of these methods various for different coals, which is caused by the diversity of coal origin, various characteristics of coal and, especially, by the various modes of mercury occurrence in coal. It should be mentioned that the coal cleaning process allows for the removal of mercury occurring in mineral matter, mainly in pyrite. The thermal pretreatment of coal allows for the removal of mercury occurring in organic matter as well as in the inorganic constituents characterized by a low temperature of mercury release. In this paper, the guidelines for the selection of mercury removal method from hard coal were presented. The guidelines were developed taking into consideration: the effectiveness of mercury removal from coal in the process of coal cleaning and thermal pretreatment, the synergy effect resulting from the combination of these processes, the direction of coal utilization as well as the influence of these processes on coal properties.