Method for producing ammonium paratungstate

Details Method for producing ammonium paratungstate Method for producing ammonium paratungstate

1985-03-21

1986-11-18

Doll, John

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4100

Patent

active

046235345

ABSTRACT:
A method is disclosed for producing relatively pure ammonium paratungstate from an impure tungsten solution. The method involves first adding hexamethylenetetramine to the tungsten solution and adjusting the pH to from about 1.0 to about 2.0 with a mineral acid to form a first precipitate of a tungsten hexamethylenetetramine product, which is then separated from its mother liquor. The precipitate is then slurried in water and the pH adjusted to from about 7.0 to about 8.5 with ammonia to dissolve the precipitate. The resulting solution is then adjusted to from about 1.0 to about 2.0 with a mineral acid to form a second precipitate of the tungsten hexamethylenetetramine product which is then separated from its mother liquor. The second precipitate is then slurried in a solution of water and sufficient ammonia to form ammonium paratungstate which crystallizes out on evaporation of the slurry. The ammonium paratungstate is then separated from its mother liquor.

REFERENCES:
patent: 3052516 (1982-09-01), Drobnick et al.

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