Method of decreasing the organic substance content of alum earth

Details Method of decreasing the organic substance content of alum earth Method of decreasing the organic substance content of alum earth

1980-10-29

1982-06-15

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423121, 423130, C01F 706, C01F 746

Patent

active

043350828

ABSTRACT:
The invention relates to a new method of reducing the organic substance content of alum earth production cycle performed according to the Bayer technology. By the method of the invention the majority of the organic substances present in the circulating lye can be removed easily and with only slight losses in sodium content.
According to the invention one proceeds so that soda present in the hydrate wash and/or in the soda salt solution is caustified with lime, the solution is evaporated to reach a total sodium oxide concentration of 200 to 400 g/l, the precipitated solid is separated and removed from the system, and the liquid is recycled.

REFERENCES:
patent: 2522605 (1950-09-01), Cundiff
patent: 2806766 (1957-09-01), Anderson
patent: 3120996 (1964-02-01), Porter
patent: 3210155 (1965-10-01), Cagnolatti et al.
patent: 4046855 (1977-09-01), Schepers et al.

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