Sample records for CENIZA DE SODA (soda ash)
from WorldWideScience.org

Sample records 1 - 3 shown.



1

Islamic glasses from Al-Andalus. Characterisation of materials from a Murcian workshop (12th century AD, Spain)

Carmona, Noemí; Villegas, María Ángeles; Jiménez Castillo, Pedro; Navarro Palazón, Julio; García-Heras, Manuel
2009-01-01

Digital.CSIC (Spain)

2

Composition of the base glass used to realize the stained glass windows by Duccio di Buoninsegna (Siena Cathedral, 1288–1289 AD): A geochemical approach

Basso, E.; Riccardi, Maria Pia; Messiga, B.; Mendera, M.; Gimeno, D.; García-Vallés, M.; Fernandez-Turiel, J. L.; Bazzocchi, Flavia; Aulinas, M.; Tarozzi, Camillo
2009-12-01

Digital.CSIC (Spain)

3

Análisis químico cuantitativo y condiciones de pulpaje kraft de colihue: Parte I/ Chemical analysis and kraft pulp production. Part I: colihue

MARIANI A, SILVANA; TORRES U, MARCO
2004-04-01

Resumen en español Se analiza la aptitud pulpable de una bambusácea nativa chilena, colihue (Chusquea culeou E. desv.), para lo cual se recolectan culmos entre 13 y 36 mm de diámetro con longitudes de 3 m, completamente limpios de ramas desde predios de la X Región de Chile. Los análisis químicos, pulpas y licores negros de cocción se realizan a través de normas TAPPI. Los culmos en paquetes se llevan al astillador industrial utilizado para especies maderables, estas astillas se some (mas) ten a un proceso kraft variando la carga de álcali activo y tiempo de permanencia a 170ºC, manteniendo constante el resto de las condiciones de pulpaje. Entre las propiedades químicas destaca el alto contenido de extraíbles totales, solubles en soda 1% y cenizas, valores que superan notablemente a los encontrados en especies maderables, en cambio el contenido de holocelulosa y lignina son similares a especies de latifoliadas. Las astillas de colihue producidas por el astillador industrial presentan granulometría conforme a lo permitido por el pulpaje kraft. La carga de álcali activo en el rango de 12 a 16% bms, otorga rendimientos clasificados entre 42,4 y 47,5% bms con rechazos entre 1,7 y 8,9% bms y números de Kappa entre 8,8 y 18,8. El aumento en la carga de álcali activo influye principalmente en la reducción de rechazo y aumento de la deslignificación. El colihue presenta muy buenas características pulpables como para destinarlo a proceso kraft Resumen en inglés The pulp mass capability of the Chilean bamboo, colihue (Chusquea culeou E. desv.), was analyzed. Culms (3 m long), which were free from branches and had diameters between 13 and 36 mm, were collected in farms from southern Chile (X Region) for this purpose. Chemical, pulp and black liquor analyses were carried out using Technical Association Pulp and Paper Industry (TAPPI) rules. Packs of culms were taken to industrial chippers that specialized in timber-yielding species (mas) . The chips were subjected to a kraft process, with a varied alkali charge and a permanence time at 170 °C. The rest of the pulp conditions were kept constant. A high content of total extractable chemicals, soluble in 1% soda and ash, had values that clearly exceeded those found in timber-yielding species. On the other hand, the content of holocellulose and lignin were similar to those of hardwood species. Colihue chips produced by the industrial chipper showed granulometry according to that permitted by kraft pulp. The active alkali charge inside ranged from 12% to 16% o.d. wood and showed screened yields between 42.4% and 47.5% o.d. wood. Rejections ranged from 1.7% and 8.9% o.d. wood, with kappa numbers between 8.8 and 18.8. The increment in the active alkali charges directly resulted in a decrease in rejection and an increase in delignification. Colihue submitted to the kraft process exhibited very good pulp characteristics

Scientific Electronic Library Online (Spanish)