Process for separation of tungsten and molybdenum by extraction

Details Process for separation of tungsten and molybdenum by extraction Process for separation of tungsten and molybdenum by extraction

C - Chemistry, Metallurgy

22

B

53/145

C22B 34/30 (2006.01)

Patent

CA 1043572

ABSTRACT OF THE DISCLOSURE A process for separation of tungsten and molybdenum by extraction involves the addition to an aqueous solution con- taining tungsten and molybdenum nitric or hydrochloric acid to obtain pH from 0.5 to 1.5, introduction of a stabilizer comprising water-soluble phosphorus salts and a complexing agent - hydrogen peroxide in an amount from 1.5 to 2 mol per 1 g-atom of the total content of tungsten and molybdenum. Then molybdenum is selectively extracted from the resulting aqueous solution with tri-n-butylphosphate with equal volu- metric proportioning of the aqueous and organic solutions. Re-extraction of molybdenum and partially tungsten is car- ried out from the organic extracting agent with an alkali or soda solution. The process enables the preparation of tungsten solution containing no more than 0.001 g/1 of molybdenum, and an increase in the degree of extraction of tungsten and molyb- denum.

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