Chemistry: physical processes – Physical processes – Crystallization
Patent
1991-11-26
1992-11-17
Lewis, Michael
Chemistry: physical processes
Physical processes
Crystallization
23305A, 423121, 423127, 423625, 423629, B01D 902
Patent
active
051639734
ABSTRACT:
In a process for precipitating alumina hydrate from a stream of Bayer process liquor, wherein the stream is first divided into a major portion and a minor portion, the minor portion fed to an agglomeration stage and seeded with fine seed to induce precipitation and formation of a slurry, and the major portion cooled and charged with coarse seed and directed to a growth stage to induce formation of alumina hydrate product, the steps of: separating solids from the minor portion after formation of the slurry; cooling, to a temperature of between about 45.degree. C. and about 60.degree. C., the liquid remaining after separating solids from the slurry formed in the agglomeration stage; adding an amount of coarse seed to the remaining liquid to generate a slurry of fresh hydrate nuclei; and recombining the slurry of fresh hydrate nuclei with the major portion of the stream.
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Brown, N. "The Production of Coarse Mosaie Aluminum Trihydroxide from Ball-Milled Seed," Light Metals 1990 (C. Bechert, ed.), pp. 131-139.
Alcan Internatinal Limited
Lewis Michael
Nguyen Ngoc-Yen M.
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