Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1989-01-26
1991-03-26
Morris, Theodore
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 54, 423606, C01G 3700
Patent
active
050027409
ABSTRACT:
A process is disclosed for purifying molybdenum containing arsenic and phosphorus which involves leaching molybdenum trioxide in an acid at a temperature of above about 70.degree. C. to remove impurities from the molybdenum trioxide and produce a partially purified molybdenum trioxide, adding to an acidic slurry of the leached molybdenum trioxide, a source of magnesium ions in a solid form with the amount of magnesium and the magnesium ion concentration in the subsequently formed ammonium molybdate solution being sufficient to subsequently form insoluble material containing greater than about 80% by weight of the arsenic and greater than about 80% by weight of the phosphorus, and ammonia in an amount sufficient to subsequently dissolve the molybdenum and subsequently form the insoluble material, digesting the resulting ammoniated slurry at a temperature sufficient to dissolve the molybdenum and form an ammonium molybdate solution while the pH is maintained at from about 9 to about 10 to form the insoluble material wherein the arsenic is present as magnesium ammonium arsenate and the phosphorus is present as magnesium ammonium phosphate, and separating the insoluble material from the ammonium molybdate solution.
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Cheresnowsky Michael J.
Scheftic Judy L.
Castle Donald R.
GTE Products Corporation
Morris Theodore
Squillante Edward
Walter Robert E.
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