Removal of oxalate from bayer process liquor

Details Removal of oxalate from bayer process liquor Removal of oxalate from bayer process liquor

1980-01-22

1981-06-23

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423121, 423127, 23301, 23302T, C01F 706, C01F 746

Patent

active

042750431

ABSTRACT:
Sodium oxalate is supersaturated solution in Bayer spent liquor stabilized by the presence of humic material is precipitated by the treatment with an adsorbent which adsorbs the humic material to give an insoluble product, thus removing it from solution and destabilizing the solution with respect to precipitation of sodium oxalate. The preferred adsorbent is activated carbon. The activated carbon can be dispersed in the spent liquor as a fine powder or the spent liquor can be passed through a column of particulate carbon. Precipitation of sodium oxalate can be expidited by addition to seed crystals and/or addition of sodium oxalate solution which is supersaturated at a temperature higher than that of the spent liquor.

REFERENCES:
patent: 3337305 (1967-08-01), Byrns
patent: 3457032 (1969-07-01), Buteque
patent: 3899571 (1975-08-01), Yamada et al.
patent: 4038039 (1977-07-01), Carruthers
patent: 4046855 (1977-09-01), Schepers et al.
patent: 4101629 (1978-07-01), Mercier et al.

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