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Alumina miniplant operations--overall mass balance for clay-HCl acid leaching.

Authors
Sawyer-DL Jr.; Turner-TL; Hunter-DB
Source
Boulder City, NV: U.S. Department of the Interior, Bureau of Mines, RI 8759, 1983 Apr; :1-29
Link
NIOSHTIC No.
10002801
Abstract
To provide technology that can help decrease the dependence of the U.S. aluminum industry on imported bauxite, the main ore of aluminum, the Bureau of Mines is investigating the extraction of aluminum from abundant domestic reserves of kaolinitic clay. Miniplant studies of the continuous leaching of calcined kaolin with boiling 25-pct hcl acid resulted in a 93- to 99-pct extraction of the acid-soluble alumina in the calcined kaolin feed. Data are presented for an acid leaching study carried out in three or four continuously stirred tank reactors (cstr) in series, feed rates of 100 to 250 lb/hr of calcined kaolin, and total nominal residence times of 0.7 to 2.3 Hr. A material balance for a 176-lb/hr calcined kaolin feed rate in a circuit consisting of three reactors, four classifiers, and five thickeners is given. Data provide detailed compositional and physical information for calcined kaolin, process liquors, and acid-leached residue solids.
Keywords
Acid treatment; Aluminum; Clay minerals; Hydrochloric acid; Kaolinite; Leaching; Materials recovery; Roasting
Publication Date
19830401
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
PB83-214346
NTIS Price
A03
Identifying No.
RI-8759
NIOSH Division
BCEL
Source Name
Boulder City, NV: U.S. Department of the Interior, Bureau of Mines, RI 8759
State
NV
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