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Hcl Process for the Production of Alumina from Clay.

Authors
Shanks-DE; Eisele-JA
Source
Paper in Chemeca '88 Institution of Engineers Australia 1988 :7 pages
Link
NIOSHTIC No.
10006263
Abstract
This paper describes in-depth studies conducted by the Bureau of Mines on the recovery of alumina from kaolinitic clay in order to provide technology for alumina production from domestic raw materials. The hyrochloric acid (hcl) process consists of the following steps: (1) clay calcination at 750 deg c, (2) clay leaching with 26-pct hcl, (3) removal of iron from pregnant liquor by solvent extraction, (4) crystallization of aluminum chloride hexahydrate from pregnant liquor by hcl gas injection, and (5) calcination of aluminum chloride hexahydrate to al203 with hcl recovery. All unit operations except 5 were run on a semicontinuous basis in a pilot plant. Research also investigated process alternatives, such as leaching of uncalcined clay, changes in leaching acid concentration and stoichiometry, elimination of solvent extraction for iron removal, and formation of aluminum oxychloride instead of aluminum chloride hexahydrate as an intermediate product.
Publication Date
19880101
Document Type
OP;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
OP 124-88
NIOSH Division
RERC;
Source Name
Paper in Chemeca '88. Institution of Engineers, Australia, 1988, PP. 316-322
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