Alumina hydrate production from Bayer liquor by seeding

Details Alumina hydrate production from Bayer liquor by seeding Alumina hydrate production from Bayer liquor by seeding

1980-08-06

1981-12-15

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

23301, 23305A, 423121, 423124, 423127, 423629, C01F 706

Patent

active

043059139

ABSTRACT:
A precipitation system is provided for the production of strong, coarse alumina hydrate (Al.sub.2 O.sub.3.3H.sub.2 O) from Bayer process aluminate liquors. In the system three distinct, but interconnected processing stages are utilized which comprise an agglomeration stage, a growth stage and a seed generation stage. In the agglomeration stage hydrate particles agglomerate to form coarse particles; in the growth stage these particles grow and acquire strength; while in the seed generation stage alumina hydrate seed is generated to be used in the agglomeration and growth stages.
The precipitation system combines the advantages of both the American and European Bayer processes in that it results in the production of a strong, coarse product hydrate and an increased yield.

REFERENCES:
patent: 1943786 (1934-01-01), Cowles
patent: 3545923 (1970-12-01), Mercier et al.
patent: 3649184 (1972-03-01), Featherston
patent: 4014985 (1977-03-01), Haleen et al.
patent: 4049773 (1977-09-01), Mejdell et al.
patent: 4234559 (1980-11-01), Tschamper

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