Electrolytic method for producing ammonium paratungstate from ce

Details Electrolytic method for producing ammonium paratungstate from ce Electrolytic method for producing ammonium paratungstate from ce

1990-04-04

1991-06-04

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204 91, 423 53, 423606, C25B 100

Patent

active

050211331

ABSTRACT:
A method is disclosed for producing ammonium paratungstate from cemented tungsten carbide which comprises subjecting the cemented tungsten carbide to electrolysis by passing about 0.5 to about 20 volts through an ammoniacal solution selected from the group consisting of ammonium hydroxide-ammonium chloride solution, ammonium hydroxide-ammonium carbonate solution, and ammonium hydroxide-ammonium sulfate solution, wherein platinum and the cemented tungsten carbide serve as the anode and wherein the anode is immersed in the solution, to decompose the cemented tungsten carbide and form a solution of ammonium tungstate from which is crystallized ammonium paratungstate.

REFERENCES:
patent: 3936362 (1976-02-01), Vanderpool et al.
patent: 4283258 (1981-08-01), Vanderpool et al.
patent: 4624844 (1986-11-01), Scheithauer et al.
patent: 4664899 (1987-05-01), Kimmel et al.

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