Method for the recovery of alumina

Details Method for the recovery of alumina Method for the recovery of alumina

1983-06-21

1985-04-23

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423127, 23301, 23305A, C01F 706

Patent

active

045129592

ABSTRACT:
Process for recovering coarsely crystalline alumina hydrate from bauxite according to the Bayer process wherein, in the presence of fine seed crystals, agglomerates are initially formed in a supersaturated sodium aluminate solution at 80.degree. to 65.degree. C. The agglomerates are then conducted through a first cascade of crystallizers and, after cooling to 55.degree. to 45.degree. C., through a second crystalizer cascade. A crystal suspension is extracted from the last crystallizer of the second crystallizer cascade and fractionated into fine seed crystals and coarse product crystals.

REFERENCES:
patent: 2707669 (1955-05-01), Houston et al.
patent: 4234559 (1980-11-01), Tschamper
patent: 4305913 (1981-12-01), Anjier
patent: 4311486 (1982-01-01), Yamada et al.
patent: 4364919 (1982-12-01), Yamada et al.

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