Process for purifying molybdenum trioxide

Details Process for purifying molybdenum trioxide Process for purifying molybdenum trioxide

1985-03-27

1986-06-24

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 56, 423 58, 423 61, 423606, C01G 3900

Patent

active

045967016

ABSTRACT:
Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of sulfuric acid, ammonium sulfate, and ammonium persulfate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.

REFERENCES:
patent: 3694147 (1972-09-01), Drobnick et al.
patent: 3829550 (1974-08-01), Ronzio et al.
patent: 3848049 (1974-11-01), Ronzio et al.
patent: 3860419 (1975-01-01), Weber et al.
patent: 3957946 (1976-05-01), Ronzio et al.

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