Method of producing crystalline ammonium metatungstate

Details Method of producing crystalline ammonium metatungstate Method of producing crystalline ammonium metatungstate

1985-02-25

1986-09-16

Doll, John

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4100

Patent

active

046121820

ABSTRACT:
A method is disclosed for producing crystalline ammonium metatungstate from ammonium paratungstate. The method involves heating the ammonium paratungstate at from about 100.degree. C. to about 250.degree. C. for from about 1 hour to about 8 hours to remove some ammonia and water, digesting a solution of the heated ammonium paratungstate in water at from about 80.degree. C. to about 100.degree. C. for from about 2 hours to about 6 hours at relatively constant volume while maintaining the pH of the slurry at from about 4.2 to about 3.0 by addition of ammonia as necessary to form a solution of ammonium metatungstate in water. The ammonium metatungstate solution is then evaporated to concentrate it. Any insoluble material is separated from the solution. Ammonium metatungstate is then crystallized from the resulting concentrated ammonium metatungstate solution.

REFERENCES:
patent: 3175881 (1965-03-01), Chiola et al.
patent: 3956474 (1976-05-01), Ritsko
patent: 4504461 (1985-03-01), Carpenter et al.

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