Process for producing ammonium heptamolybdate and/or ammonium di

Details Process for producing ammonium heptamolybdate and/or ammonium di Process for producing ammonium heptamolybdate and/or ammonium di

1976-12-27

1978-03-14

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 54, 423 58, 423593, 23297, 23302A, C01G 3900

Patent

active

040791165

ABSTRACT:
A process for producing a high purity ammonium heptamolybdate and/or ammonium dimolybdate product by which a particulated molybdenum oxide concentrate is purified to remove contaminating metal cations, whereafter it is leached with an ammoniacal leach solution to extract the molybdenum trioxide constituent therein as soluble ammonium molybdate compounds. The resultant ammoniacal leach solution is thereafter concentrated at an elevated temperature, whereafter at least a portion thereof is adjusted to provide an ammonia-to-molybdenum trioxide mol ratio ranging from about 0.86:1 to about 1.25:1, and the adjusted solution thereafter is cooled to effect a precipitation of ammonium heptamolybdate crystals which are separated and recovered, and the balance of the cooled solution is recirculated for admixture with additional ammoniacal leach solution. A portion of the concentrated ammoniacal leach solution can be further concentrated by evaporation to effect crystallization of ammonium dimolybdate which is separated and recovered.

REFERENCES:
patent: 1838767 (1931-12-01), Iredell
patent: 3357821 (1967-12-01), Henrickson
patent: 3829550 (1974-08-01), Ronzio et al.
patent: 3848049 (1974-11-01), Ronzio et al.
patent: 3932580 (1976-01-01), Vertes et al.
patent: 3957946 (1976-05-01), Ronzio et al.
patent: 3963823 (1976-06-01), Kulkarni

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