Method for inhibiting precipitation of sodium oxalate in a Bayer

Details Method for inhibiting precipitation of sodium oxalate in a Bayer Method for inhibiting precipitation of sodium oxalate in a Bayer

1997-08-28

1999-05-11

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423130, 423122, 423127, 423123, C01F7/34

Patent

active

059025603

ABSTRACT:
A new and improved method for inhibiting the precipitation of sodium oxalate crystals in a Bayer process liquor is provided. In an embodiment, the method comprises the step of adding to the Bayer process liquor, after red mud separation, a minor effective amount of a liquor oxalate stabilizer selected from hydrocarbon-substituted amine oxide compounds and/or hydrocarbon-substituted betaine compounds.

REFERENCES:
patent: 3649185 (1972-03-01), Sato et al.
patent: 4275043 (1981-06-01), Gnyra
patent: 4999170 (1991-03-01), Brown
patent: 5385586 (1995-01-01), Farquharson et al.
"The Role of Quaternary Ammonium Compounds in Stabilizing Sodium Oxalate in Bayer Liquors," Farquharson,et al., Fourth International Alumina Quality Workshop, Darwin Jun. 2-7, 1996, pp. 447-456.
Farquharson, et al., "Development of an Effective Liquor Oxalate Stabilizer", Light Metals, pp. 95-101, 1995.

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