Recovery of aluminum from spent liquor

Details Recovery of aluminum from spent liquor Recovery of aluminum from spent liquor

1984-08-06

1986-04-08

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423122, 423127, 423130, 423181, 423185, 423186, C01F 106, C01D 134

Patent

active

045812071

ABSTRACT:
A process for the purification of spent liquor from an alumina precipitation stage is disclosed wherein the spent liquor is first contacted with 50 volume % or less ethanol to form a sodium oxalate precipitate and the, after removal of the sodium oxalate precipitate is contacted with over 50 volume % of ethanol extraction fluid to separate the mixture into a first layer comprising the ethanol and at least a portion of the caustic from the spent liquor and a second layer which comprises the remainder of the spent liquor. The spent liquor may then be subjected to a further precipitation to recover further alumina. The spent liquor remaining may be further treated in subsequent extraction steps to concentrate and dispose of undesirable impurities remaining.

REFERENCES:
patent: 2806766 (1957-09-01), Anderson
patent: 3511606 (1970-05-01), Haliff et al.
patent: 4172879 (1979-10-01), Miller et al.
patent: 4275042 (1981-06-01), Leuer
patent: 4430310 (1984-02-01), Malito et al.
patent: 4464347 (1984-08-01), Bush

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