Purification of ammonium tungstate solutions

Details Purification of ammonium tungstate solutions Purification of ammonium tungstate solutions

1981-03-31

1982-08-24

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 54, 423593, 23302A, C01G 4100

Patent

active

043460615

ABSTRACT:
Prior to evaporative crystallization of ammonium tungstate solutions to give ammonium paratungstate (APT), an aluminum compound, e.g. aluminum sulfate solution, is added to precipitate silicon and phosphorus impurities. The yield of crystallized ammonium paratungstate is thereby increased.

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S. W. H. Yih and C. T. Wang, "Tungsten", Plenum Press, New York, 1979, p. 103.

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