Recovery of tungsten valves from alkaline solutions

Details Recovery of tungsten valves from alkaline solutions Recovery of tungsten valves from alkaline solutions

1986-02-13

1987-03-31

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204103, 423 55, 423 56, 423421, C25B 122

Patent

active

046541314

ABSTRACT:
A method of removing sodium ions from an alkaline aqueous solution such as a leach solution which contains dissolved sodium tungstate. The method involves passing the solutions through the anode compartment of an electrolytic cell and passing an electrical direct current through the cell causing the sodium ions to pass through the cation selective membrane and tungstic acid to be produced in the anode compartment. Sodium-containing alkali is bled from the cathode compartment at a rate sufficient to prevent build-up of alkali in the cathode compartment. The tungstic acid is typically converted to ammonium tungstate by treatment with ammonia and then the ammonium tungstate further treated for recovery of the tungsten values.

REFERENCES:
patent: 2606148 (1952-08-01), Portandua et al.
patent: 3856641 (1974-12-01), Rothman et al.

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