Parallel purification of alumina with physical pretreatment

Details Parallel purification of alumina with physical pretreatment Parallel purification of alumina with physical pretreatment

1985-06-19

1986-09-30

Carter, H. T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423121, 423131, C01F 706

Patent

active

046146415

ABSTRACT:
Disclosed is a process for producing purified alumina from high-silica bauxite including separating alumina-rich ore containing high-silica content into a coarse fraction and a fines fraction; digesting the fines fraction in a sodium aluminate solution at low temperatures; digesting the coarse fraction in a sodium aluminate solution at higher temperatures under pressure; and precipitating out alumina from the digest solutions after the combined liquors are desilicated during clarification.

REFERENCES:
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patent: 2375343 (1945-05-01), Brown
patent: 3401009 (1968-09-01), Gittos
patent: 3413087 (1968-11-01), Roberts
patent: 3681013 (1972-08-01), Fish
patent: 3716617 (1973-02-01), Oku et al.
patent: 3868442 (1975-02-01), Fish
patent: 4468375 (1984-08-01), Misra
Holbrook et al., "Bureau of Mines, RI6280", Bureau of Mines, Washington, D.C., 1963, pp. 1-20.
Chemical Engineering, Oct. 2, 1961, pp. 42-44.
Glastonbury, J. R., Advan. Extr. Met. Proc. Symp., London, 1967, "Kinetics of Gibbsite Extraction", pp. 908-917.

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