Process for extraction of gallium from sodium aluminate liquors

Details Process for extraction of gallium from sodium aluminate liquors Process for extraction of gallium from sodium aluminate liquors

1975-10-03

1976-10-26

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75121, 423 65, 423127, 423131, C22B 5800

Patent

active

039881504

ABSTRACT:
A process for the extraction of gallium from sodium aluminate liquors comprises extracting gallium from aluminate liquors by cementation with the aid of a liquid gallium-aluminum alloy. Aluminate liquors produced in the Bayer process, prior to cementation, are freed from various impurities. To this end, the recycle aluminate liquor is cooled to a temperature at which soda crystallizes and vanadium is retained in the liquor, whereupon the crystallized precipitate is separated, while the residual liquor is mixed with the mother aluminate liquor in the ratio of 0.1-1 to 1-0.1. The resultant liquor is cooled down to ambient temperature, and the vanadium precipitate is separated. The process is a major step towards a simpler technique of gallium extraction from aluminate liquors both high and low in gallium. Also, the process permits extracting, directly from aluminate liquors, gallium in a higher degree of purity than can be obtained in the prior art. Furthermore, the process enables valuable vanadium compounds to be recovered from liquors alongside gallium.

REFERENCES:
patent: 3094378 (1963-06-01), Wolf
patent: 3170857 (1965-02-01), Dotzer

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