Recovery of aluminum from spent liquor
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United States of America Patent
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-
Apr 8, 1986
Issued Date -
N/A
app pub date -
Aug 6, 1984
filing date -
Dec 27, 1982
priority date (Note) -
Expired
status (Latency Note)
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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.
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