Purification of molybdenum

Details Purification of molybdenum Purification of molybdenum

1986-05-02

1987-10-27

Carter, H. T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 55, 423 56, 423 58, C01G 3900

Patent

active

047028955

ABSTRACT:
A method is disclosed for purifying molybdenum which involves adding to an ammoniacal ammonium molybdate solution containing the impurities of phosphorus and arsenic with the phosphorus concentration being from about 0.01 to about 0.12 g/l, a soluble magnesium salt to form a precipitate comprising magnesium ammonium salts of the phosphorus and arsenic, and to form a purified ammonium molybdate solution. The amount of the magnesium salt is sufficient to result in a concentration of from about 0.005 to about 0.04 moles/l in the ammoniacal ammonium molybdate solution. The resulting purified ammonium molybdate contains no greater than about 0.01 g P/l. The precipitate is separated from the purified solution which is then contacted with a chelating cation exchange resin supplying a sufficient amount of a cation to result in removal of the major portion of the magnesium ions from the purified solution and form a further purified ammonium molybdate solution.

REFERENCES:
patent: 3829550 (1974-08-01), Ronzio et al.
patent: 4273745 (1981-06-01), Laferty et al.
patent: 4320094 (1982-03-01), Menashi et al.
patent: 4555386 (1985-11-01), Cheresnowsky

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