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

046121803

ABSTRACT:
A method is disclosed for producing crystalline ammonium metatungstate from ammonium paratungstate. The method involves heating the ammonium paratungstate with microwave radiation, then heating an aqueous slurry of the heated ammonium paratungstate at from about 80.degree. to about 100.degree. C. at relatively constant volume until the pH of the slurry becomes stabilized at from about 5.8 to about 6.8, adjusting the pH of the slurry to from about 4.2 to about 30, digesting the resulting pH adjusted slurry at from about 80.degree. to about 100.degree. C. for from about 2 to about 6 hours to form a solution of ammonium metatungstate, concentrating the resulting solution, separating insolubles from the solution, and crystallizing ammonium metatungstate from the concentrated solution.

REFERENCES:
patent: 3175881 (1965-03-01), Chiola et al.
patent: 3857929 (1974-12-01), Quatrini et al.
patent: 3956474 (1976-05-01), Ritsko
patent: 4504461 (1985-03-01), Carpenter et al.

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