Process for the manufacture of ammonium tungstate from...

Details Process for the manufacture of ammonium tungstate from... Process for the manufacture of ammonium tungstate from...

C - Chemistry, Metallurgy

01

G

23/251

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

Patent

CA 1068072

ABSTRACT OF THE DISCLOSURE A process for the manufacture of a tungstate salt, especially ammonium tungstate, is disclosed. In the process a reduced alkaline earth metal tungstate is contacted with an aqueous solution of a compound having a cation selected from the ammonium ion and/or alkali metal cations and at least one anion selected from hydroxide, carbonate, bicarbonate, oxalate and phosphate. At least one of the anions is an anion from which an insoluble compound of the alkaline earth metal is derived, the anion being in a concentration such that the insoluble compound is less soluble in the solution than the alkaline earth metal tungstate, The solution also contains an oxidizing agent, e.g. oxygen, hydrogen peroxide and per- oxides of alkali metals. me process may be used in the separation of tungsten from scheelite, or ores convertible thereto.

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