Process for conditioning tungsten concentrates

Details Process for conditioning tungsten concentrates Process for conditioning tungsten concentrates

C - Chemistry, Metallurgy

22

B

53/148

C22B 34/36 (2006.01) C01G 41/00 (2006.01)

Patent

CA 1181952

PROCESS FOR CONDITIONING TUNGSTEN CONCENTRATES ABSTRACT OF THE DISCLOSURE A process for conditioning a tungsten concentrate containing tungsten as WO3, 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 WO3 in the concentrate will be formed and heating the concentrate to a temperature of at least about 500°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 WO3, 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.

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