Process for conditioning tungsten concentrates

Details Process for conditioning tungsten concentrates Process for conditioning tungsten concentrates

1981-01-19

1982-07-06

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 61, 423 58, 75 1R, C01G 4100

Patent

active

043382878

ABSTRACT:
A process for conditioning a tungsten concentrate containing tungsten as WO.sub.3, sulfur as sulfide, and calcite to fix at least a portion of the sulfur as calcium sulfate by reaction with the calcite, comprises providing a tungsten concentrate having a calcite content such that less than about 15 wt. % calcium sulfate based on the weight of the WO.sub.3 in the concentrate will be formed and heating the concentrate to a temperature of at least about 500.degree. C. in an oxidizing atmosphere to oxidize substantially all the sulfur in the concentrate to provide a conditioned concentrate having a calcium sulfate content less than about 15% based on the weight of the WO.sub.3, whereby the conditioned concentrate can be efficiently leached with alkali metal carbonates or hydroxides and the resulting alkali metal tungstate solution can be effectively treated to recover an ammonium tungstate solution.

REFERENCES:
patent: 1431559 (1922-10-01), Becket
Yih et al., "Tungsten", Plenum Press, N.Y., 1979, pp. 82-83.

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