Separation of trace molybdenum from tungstate solutions

Details Separation of trace molybdenum from tungstate solutions Separation of trace molybdenum from tungstate solutions

C - Chemistry, Metallurgy

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B

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C22B 34/34 (2006.01) C01G 39/06 (2006.01) C01G 41/00 (2006.01) C22B 34/36 (2006.01)

Patent

CA 1183002

SEPARATION OF TRACE MOLYBDENUM FROM TUNGSTATE SOLUTIONS Abstract of the Disclosure Dissolved molybdenum is removed from sodium tungstate solutions by adding sulfuric acid to lower the pH value of the solution to between about 8 and about 5, adding to the sodium tungstate solution a water-soluble sulfide in an amount of at least 0.5 gram per liter (gpl) in excess of that required to precipitate as sulfides molybdenum and certain other metals, then lowering the pH value of the sodium tungstate solution to between about 4.0 and about 1.5 as rapidly as possible with sulfuric acid in such a way as to precipitate molybdenum trisulfide while minimizing co-precipitation of tungsten.

394081

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