Production of molybdenum oxide from ammonium molybdate solutions

Details Production of molybdenum oxide from ammonium molybdate solutions Production of molybdenum oxide from ammonium molybdate solutions

1979-10-03

1981-06-16

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 6, 423 11, 423 55, 423 58, 423606, C01G 3902

Patent

active

042737451

ABSTRACT:
Molybdenum is recovered from an ammonium molybdate solution containing phosphate anions by digesting in an ammonium molybdate solution at least one water-soluble compound of at least one metal selected from the group consisting of aluminum, calcium, iron and magnesium in small but effective amounts to precipitate at least about 50% of the phosphate anions for a time sufficient to precipitate the phosphate anion, separating the phosphate precipitate from the ammonium molybdate solution, then acidifying the ammonium molybdate solution with at least one mineral acid selected from the group consisting of sulfuric acid and nitric acid to lower the pH value of the solution to between about 2.5 and about 4.5 to precipitate ammonium polymolybdate, and calcining the ammonium polymolybdate at a temperature below about 750.degree. C. to produce a molybdenum trioxide product.

REFERENCES:
patent: 2096846 (1937-10-01), Donahue et al.
patent: 3288570 (1966-11-01), Henrickson
patent: 3341305 (1967-09-01), Kreevay et al.
patent: 3455677 (1969-07-01), Litz
patent: 3681016 (1972-08-01), Litz
patent: 4092399 (1978-05-01), Narayan
patent: 4199551 (1980-04-01), Laferty et al.

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