Purification of molybdenum

Details Purification of molybdenum Purification of molybdenum

1985-02-22

1986-09-16

Carter, H. T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423593, C01G 3900

Patent

active

046121722

ABSTRACT:
A process is disclosed for removing potassium from a relatively impure molybdenum trioxide and forming a molybdenum compound of high purity. The process involves first contacting the impure molybdenum trioxide with an acid leach which consists essentially of a mineral acid and the ammonium salt of the mineral acid in a weight ratio of above about 3 to 1 of acid leach to molybdenum trioxide at a sufficient temperature and for a sufficient time to solubilize the major portion of the potassium and form a leached molybdenum trioxide, followed by separating the leached molybdenum trioxide from the resulting potassium containing acid leach. The leached molybdenum trioxide is then water washed to remove residual impurities and the washed molybdenum trioxide is dissolved in ammonium hydroxide having an ammonium concentration sufficient to form an ammonium molybdate solution from which is crystallized the highly pure molybdenum compound.

REFERENCES:
patent: 3694147 (1972-09-01), Drobnick et al.
patent: 3860419 (1975-01-01), Weber et al.
patent: 3957946 (1976-05-01), Ronzio et al.
patent: 4525331 (1985-06-01), Cheresnowsky et al.

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