Method for the recovery of alumina

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

C - Chemistry, Metallurgy

01

F

23/240

C01F 7/14 (2006.01)

Patent

CA 1191665

ABSTRACT Improved method for recovering coarse-crystalline aluminum oxide from bauxite according to the Bayer method with which, in the presence of fine seed crystals in a supersaturated sodium aluminate solution at 80 to 65°C, agglomerates are first of all formed, which are then, if necessary while introducing medium-coarse seed crystals, led through a first cascade of crystallizers and, after cooling to 55 to 45°C, through a second crystallizer cascade. The drawn off crystal-suspension is fractionated into fine seed crystals, if necessary also medium- coarse seed crystals, and coarse product crystals which are ultimately calcined.

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