Process for producing ammonium metatungstate

Details Process for producing ammonium metatungstate Process for producing ammonium metatungstate

1983-09-02

1985-03-12

Dell, John

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4100

Patent

active

045044619

ABSTRACT:
A process is provided for producing ammonium metatungstate comprising fluid bed roasting ammonium paratungstate at a temperature over the range of about 275.degree. C. to 305.degree. C. for a time at least sufficient to provide a roasted product in the form of a precursor of ammonium metatungstate, forming an aqueous slurry of the precursor and digesting the precursor at a pH of about 3 to 4 for a time at least sufficient to effect substantially complete dissolution of said precursor, filtering the digested slurry to produce a clear filtrate, and further processing the clear filtrate by evaporation to provide crystals of substantially pure ammonium metatungstate.

REFERENCES:
patent: 3175881 (1965-03-01), Chiola et al.
patent: 3304249 (1967-02-01), Katz
patent: 3451764 (1969-06-01), MacWilliams et al.
patent: 3591331 (1971-07-01), Chiola et al.
patent: 3857928 (1974-12-01), Kim et al.
patent: 3936362 (1976-02-01), Vanderpool et al.
patent: 4080421 (1978-03-01), Kasserra
patent: 4083922 (1978-04-01), Kasserra

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