METHOD FOR OBTAINING AMMONIUM TUNGSTATE Russian patent published in 2014 - IPC C22B34/36 C01G41/00 C22B3/24 

FIELD: metallurgy.

SUBSTANCE: invention refers to processing of tungsten-containing raw material. Tungsten-containing carbonate solution is subject to thickening by means of flocculant VPK 402 for removal from the solution of such impurities as BO₃ ^3-, PO₄ ^3-, AsO₄ ^3- and SiO₃ ². Then, the solution is subject to the first stage of ionic exchange on anionite AB-17-8 in a sulphate shape for removal of a carbonate-ion. At the second stage a tungstate-ion is sorbed. For tungstate desorption a solution containing 50 g/l of (NH₄)₂SO₄ and 200 g/l of NH₄OH is used, and for sorption of the carbonate-ion a solution of Na₂SO₄ with concentration of 190 g/l is used.

EFFECT: separate extraction from tungsten-containing carbonate solution of 98% of tungstate and 98% of sodium carbonate.

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