Separation of trace molybdenum from tungstate solutions

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

1981-01-19

1981-12-01

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 58, 423561R, C01G 3900, C01G 4100

Patent

active

043036236

ABSTRACT:
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.

REFERENCES:
patent: 2339888 (1944-01-01), Smith
patent: 3173754 (1965-03-01), Kurtak
patent: 3939245 (1976-02-01), Bellingham
patent: 3969484 (1976-07-01), Onozaki et al.

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