Process for removing tungsten from cemented tungsten carbide

Details Process for removing tungsten from cemented tungsten carbide Process for removing tungsten from cemented tungsten carbide

1979-12-21

1981-03-10

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 55, 423 53, C01G 4100

Patent

active

042553970

ABSTRACT:
In a process for recovering tungsten from cemented tungsten carbide, the tungsten carbide is oxidized to form an oxidized product and the oxidized product is digested in an aqueous solution of alkali metal hydroxide to form a soluble portion containing tungsten values and an insoluble residue portion. According to the improved process of the present invention, tungsten values are recovered from the insoluble residue portion by mixing the insoluble portion with an alkali metal carbonate to form a resulting mixture, roasting the resulting mixture in an atmosphere containing oxygen to oxidize the insoluble portion and form another product which is leached with water to recover soluble tungsten values.

REFERENCES:
patent: 3800025 (1974-03-01), Fox
patent: 3887680 (1975-06-01), MacInnis et al.

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