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Aluminum Chloride Leaching and Hydrolytic Disproportionation to Produce Alumina from Kaolin.

Authors
Dan-GL; Eisele-JA
Source
Metallurgical Society Inc 1988 :825-832.
Link
NIOSHTIC No.
10006256
Abstract
In the work described in this paper, the Bureau of Mines extracted aluminum from calcined kaolin with aluminum chloride solution or substoichiometric amounts of hydrochloric acid. The leaching method produced solutions containing basic aluminum chloride salts, which require less energy for decomposition to alumina than the aluminum chloride hexahydrate (ach) produced in the Bureau of Mines clay-hcl process. Hydrolytic disproportionation at elevated temperature and pressure of the basic aluminum chloride solution produced hydrated aluminum oxide with very low chloride content and an aluminum chloride solution for recycle to leaching. Simulated two-stage counter-current leaching and the hydrolytic disproportionation of the resulting basic aluminum chloride solution were integrated. Buildup of silica and iron in solution and coprecipitation during disproportionation prevented recovery of a cell-grade alumina product; and aluminum recovery, under the conditions tested, was not adequate to achieve complete aluminum chloride leachant regeneration.
Publication Date
19880101
Document Type
OP;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
OP 115-88
NIOSH Division
RERC;
Source Name
Metallurgical Society, Inc., 1988, PP. 825-832.
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