Process for recovering tungsten from tungsten bearing material c

Details Process for recovering tungsten from tungsten bearing material c Process for recovering tungsten from tungsten bearing material c

1986-10-24

1988-05-03

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 56, 423 57, 423 87, 210729, 75108, 75101R, 75121, C01G 4100

Patent

active

047418869

ABSTRACT:
A process is disclosed for recovering tungsten from tungsten bearing material containing arsenic. The process involves adjusting a water slurry of the material to a pH of less than about 4 with an acid to solubilize the major portion of the tungsten, adding an insoluble ferric compound to the slurry to form a two phase system in which the solid phase contains the major portion of the arsenic and of any phosphorus which may be present, and a solution phase containing the major portion of the tungsten. After separation of the solid from the solution, the solution is adjusted to a pH of less than about 2 with an acid and a suffficient amount of hexamethylenetetramine is added to the solution to precipitate the major portion of the tungsten, followed by separating the precipitate from the resulting liquor. The solid phase containing the arsenic and phosphorus, if any, can be contacted with water and a soluble ferric salt to produce a treated solid which passes the EP toxicity test.

REFERENCES:
patent: 4279870 (1981-07-01), Natansohn et al.
patent: 4328190 (1982-05-01), Beckstead et al.
patent: 4624703 (1986-11-01), Vanderpool et al.

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