Treatment of tri(alkaline earth metal) tungstates with acids

Details Treatment of tri(alkaline earth metal) tungstates with acids Treatment of tri(alkaline earth metal) tungstates with acids

C - Chemistry, Metallurgy

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

Patent

CA 1068070

ABSTRACT OF THE DISCLOSURE A process for the manufacture of tungstic acid is disclosed. The process comprises the steps of (a) treating tri(alkaline earth metal) tungstate with an aqueous solution of hydrochloric and/or nitric acid so as to convert the tri(alkaline earth metal) tungstate into insoluble tungstic acid and (b) separating the tungstic acid room solution. Preferably the temperature of the solution is less than 50°C. and the concentra- tion of acid is less than 5 molar. In an embodiment the tri- (alkaline earth metal) tungstate is formed from iron tungstate, manganese tungstate and/or an alkaline earth metal tungstate. The process may be used in the separation of tungsten from scheel- ite ore or from the wolframite ores.

244540

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