Removal of organic contaminants from bauxite and other ores

Details Removal of organic contaminants from bauxite and other ores Removal of organic contaminants from bauxite and other ores

1983-02-22

1985-05-28

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423127, 423129, 423130, C01F 706

Patent

active

045199892

ABSTRACT:
A process for removing organic contaminants from a mineral ore such as bauxite. The ore is washed with an aqueous solution containing caustic soda, sodium carbonate or mixtures thereof in an amount up to about 80 g/l total alkali content (expressed as sodium carbonate equivalent). The ore is preferably washed at a temperature of about 95.degree. C. for about 5 hours with a solution containing about 20 g/l total alkali content. In a preferred embodiment, the ore is separated from a rinse solution containing degradation products of organic contaminants, and the washed ore is then dissolved in a caustic solution to produce Bayer process liquor. This process provides a means to reduce the organic carbon concentration in Bayer process liquor, with resultant increase in productivity of the Bayer process.

REFERENCES:
patent: 1757373 (1930-05-01), Kriegsheim et al.
patent: 3120996 (1964-02-01), Porter
patent: 3357792 (1967-12-01), Gebefugi
patent: 3773691 (1973-11-01), Leach
patent: 4053375 (1977-10-01), Roberts et al.
patent: 4335082 (1982-06-01), Matyasi et al.
Holbrook et al., "Bureau of Mines, RI6280", 1963, U.S. Dept. of Interior, Wash., D.C., 20 pp.
Edwards, Junius David; Frary, Francis C.; and Jeffries, Zay, "Aluminum and Its Production", The Aluminum Industry, Chemical Engineering Series, McGraw-Hill Book Company, New York, 1930, pp. 118 and 119.

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