Purification of ammonium tungstate solutions

Details Purification of ammonium tungstate solutions Purification of ammonium tungstate solutions

C - Chemistry, Metallurgy

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C01G 41/00 (2006.01) C22B 3/28 (2006.01) C22B 34/36 (2006.01)

Patent

CA 1182277

PURIFICATION OF AMMONIUM TUNGSTATE SOLUTIONS ABSTRACT OF THE DISCLOSURE 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. S P E C I F I C A T I O N -1-

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