Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1976-09-30
1977-12-20
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423127, 423128, 423131, 423199, C01F 706
Patent
active
040642178
ABSTRACT:
An improvement in the process for recovering aluminum from alunite ore disclosed in U.S. Pat. Nos. 3,890,425 and 3,890,426, the improvement being in the recovery of potassium sulfate by crystallization from the leaching solution resulting from potassium hydroxide leaching of the roasted ore, the improvement consisting of adding potassium hydroxide to the concentrated leach liquor prior to crystallization to increase the concentration of the potassium ion so that increased recoveries of potassium sulfate are obtained at a given temperature over those obtained when this procedure is not used. By this procedure a yield is obtained at a temperature below that which is required to obtain the same yield when potassium hydroxide is not used so that the high temperatures formerly necessary to hold enough potassium sulfate in solution for an economic crystallization are avoided. The improvement is particularly adapted to the process of the patents using potassium hydroxide as the leaching agent and in which the mother liquor is recycled to the leach as potassium hydroxide in an amount up to that required for the leaching step can be added in the crystallization step so that the potassium hydroxide serves both as a crystallization aid and as a leachant.
REFERENCES:
patent: 3890425 (1975-06-01), Stevens et al.
patent: 3890426 (1975-06-01), Stevens et al.
patent: 3983211 (1976-09-01), Nasyrov et al.
patent: 3984521 (1976-10-01), Nasyrov et al.
patent: 3996334 (1976-12-01), Hartman et al.
Darland Michael G.
Hartman George J.
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