Precipitation of synthetic scheelite

Details Precipitation of synthetic scheelite Precipitation of synthetic scheelite

1982-01-04

1983-08-09

Hearn, Brian E.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423593, 423 61, C22B 3430, C01G 4100

Patent

active

043978215

ABSTRACT:
Synthetic scheelite (calcium tungstate) having a low sulfur content is produced in high yield from an aqueous solution of sodium tungstate, that can be contaminated with sulfate ion dissolved therein, by digesting the solution with solid calcium sulfate whereby low-sulfur calcium tungstate precipitates. The solution remaining after filtration of the calcium tungstate product can be treated with calcium sulfate to precipitate additional purified calcium tungstate or to generate a calcium tungstate-calcium sulfate mixture that can be recycled for digestion with additional sulfate-contaminated sodium tungstate solution.

REFERENCES:
patent: 2351678 (1943-11-01), Hall
patent: 2388306 (1945-11-01), Burwell
patent: 2962349 (1957-08-01), Anglin
patent: 4313914 (1982-02-01), Huggins
Murray, "Tungsten Concentrate Leaching" in Woodcock, J. T. (ed.), Mining and Metallurgical Practices in Australasia, published by Australian Institute of Mining and Metallurgy, 1980, at pp. 452-454.

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