Purification of molybdenum trioxide

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal

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423 61, 423593, C01G 3902

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active

046438840

ABSTRACT:
A process is disclosed for removing potassium from relatively impure molybdenum trioxide. The process involves contacting the impure molybdenum trioxide containing greater than about 600 weight parts potassium per million with a first acid leach which consists essentially of nitric acid and ammonium nitrate at a temperature of at least about 50.degree. C. for a sufficient time and at above a 2 molar concentration of said nitric acid and an ammonium nitrate concentration of from about 1.5 to about 2 molar in said first acid leach to solubilize the major portion of the potassium and form a once leached molybdenum trioxide containing the remaining portion of the potassium which is separated from the resulting potassium containing acid leach and contacted with a second leach solution substantially similar to the first acid leach followed by separating the resulting twice leached molybdenum trioxide from the resulting potassium containing second leach. The twice leached molybdenum trioxide is contacted with sufficient water to remove any residual impurities followed by removal of the resulting wash water.

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), Welier et al.
patent: 3957946 (1976-05-01), Ronzio et al.
patent: 4525331 (1985-06-01), Chersnowsky et al.

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