Recovery of tungsten from ammoniacal solutions

Details Recovery of tungsten from ammoniacal solutions Recovery of tungsten from ammoniacal solutions

C - Chemistry, Metallurgy

22

B

53/148

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

Patent

CA 1245457

ABSTRACT A method is disclosed for recovering tungsten from a relatively dilute ammoniacal tungsten solution. The method involves adding hexamethylenetetramine to the tungsten solution in an amount sufficient to form a hexamethylenetetramine complex then adjusting the pH to from about 1.0 to about 2.0 with a mineral acid to form a precipitate of the complex containing at least about 99% of the tungsten, and separating the precipitate from the resulting mother liquor. - 7 -

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