Bayer process production of alumina

Details Bayer process production of alumina Bayer process production of alumina

1976-06-25

1977-07-19

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423127, 423129, 210 45, 210 59, 210 42R, C01F 706

Patent

active

040369315

ABSTRACT:
A process is provided which allows control of the impurity level of Bayer process streams with simultaneous generation of an environmentally acceptable effluent and recovery of valuable dissolved aluminum and sodium values. The process involves carbonation of a blow-down stream at 40.degree.-100.degree. C to produce sodium dawsonite [NaAl(OH).sub.2 CO.sub.2 ] and an effluent essentially free of dissolved alumina and significantly depleted in dissolved sodium. The sodium dawsonite can be used as such or returned to the Bayer process after thermal decomposition to sodium aluminate. The effluent can be directly discharged into natural receiving bodies without further treatment.

REFERENCES:
patent: 2375343 (1945-05-01), Brown
patent: 2420852 (1947-05-01), Archibald
patent: 2981600 (1961-04-01), Porter
patent: 3560148 (1971-02-01), Tamise et al.

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