Bibliography: p. 13-19.
|Statement||by Roy T. Sorensen and John L. Schaller.|
|Series||Information circular / United States Department of the Interior, Bureau of Mines ;, 8940, Information circular (United States. Bureau of Mines) ;, 8940.|
|Contributions||Schaller, John L.|
|LC Classifications||TN295 .U4 no. 8940, QD181.A4 .U4 no. 8940|
|The Physical Object|
|Pagination||19 p. :|
|Number of Pages||19|
|LC Control Number||83600121|
Ash samples from an anthracite coal waste, fired at to /sup 0/C in a fluidized bed combustor, were studied for alumina extraction and other process characteristics by using a hydrothermal alkaline digestion process with lime. The independent variables included digestion temperature, digestion time, liquor caustic concentration, target alumina concentration in the liquor after digestion (or ash to . Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link)Author: Roy T. Sorensen and John L. Schaller. extraction of alumina. Under such conditions, total extraction efficiency of % alumina was obtained. Through a direct leaching process, amorphous and crystal phases of aluminium in coal ash were leached under atmospheric pressure. For effective separation impurities other than Al3+ need to be removed through a suitable process. Abstract. Comprehensive utilization of coal fly ash is a promising industry with great environmental protection and resource recycling. Alumina extraction from coal fly ash usually produces a large amount of silicon-containing waste, which would have adverse effects on the : Yang Xue, Wenzhou Yu, Zhixiong You, Xuewei Lv.
Alumina extraction from coal fly ash (CFA) by Na 2 CO 3 activation-acid leaching method could make Al 2 O 3 and SiO 2 in CFA achieve high value utilization simultaneously, which shows wide application prospects. The large consumption of Na 2 CO 3, however, limits its industrial application.A novel process of alumina extraction from coal fly ash by “Pre-desilicating—Na 2 CO 3 activation Cited by: Coal fly ash contains large amounts of aluminum, iron, silicon and other useful elements. Its utilization effectively is of significance to harmonious development of economy, society and environment. However, coal fly ash is mainly composed of mullite and other inert glassy matters with high degree of polymerization and its reactivity is by: 1. The process of alumina extraction from CFA involved three stages; acid leach, sinter, and acid leach. •. The first leaching step extracted up to % aluminium from the amorphous phase in raw CFA. •. The second leaching step extracted up to % aluminium from the mullite phase in residue-CFA. •.Cited by: Alumina was leached from coal fly ash using a mixed alkali (NaOH + Ca (OH) 2) through the hydrothermal method. The effects of leaching conditions on the alumina were studied, and the results showed that the alumina extraction ratio increased with increased reaction temperature, calcium–silicon ratio, and liquid–solid by:
Resources and Conservation, 9 () Elsevier Scientific Publishing Company, Amsterdam - Printed in The Netherlands EXTRACTION OF LEACHABLE METALS AND RECOVERY OF ALUMINA FROM UTILITY COAL ASH R. C. GABLER, JR., and R. L. STOLL U.S. Department of the Interior, Bureau of Mines, Avondale Research Center, Avondale, Maryland (U.S.A.) ABSTRACT The classification of coal Cited by: Bauxite ore is dissolved in sodium hydroxide, or lye, at a high temperature and pressure. Then, the alumina and bauxite ores are separated by washing out the waste (red muds or sands) from the alumina. Finally, hydrated alumina is crystallized and calcinated (dried in a furnace) to produce solid alumina. Commercial alumina is produced by the Bayer process using bauxite as raw material. Alternative methods for alumina extraction from different source materials such as discarded alumina bricks. pent catalyst , s , clays and kaolins [3,4], coal fly ash , etc. have also been developed. Low aluminum contents of coal fly ash make. The alumina extraction efficiency of the products obtained under different sintering conditions has also been studied. The objective of the investigation is to provide technical support for the new process of alumina extraction from coal fly ash. 2. Experimental MaterialsCited by: