Extracting tungsten from ores and concentrates

Details Extracting tungsten from ores and concentrates Extracting tungsten from ores and concentrates

1978-02-17

1979-09-18

Hearn, Brian

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, C01G 4100

Patent

active

041682963

ABSTRACT:
A process for recovering tungsten from tungsten bearing ores comprises producing a concentrate from the ore and leaching the concentrate at atmospheric pressure in a strong mineral acid solution, for example, a solution of sulfuric acid, hydrochloric acid or nitric acid within a temperature range of from 40.degree. to 90 Centigrade for from one to four hours in the presence of an inorganic complexing agent, and adding an ammonium salt compound for precipitating the tungsten. The precipitate is then dissolved in Ammonium Hydroxide and the tungsten recovered as Ammonium Paratungstate.

REFERENCES:
patent: 1217914 (1917-03-01), Butterfield
patent: 3077379 (1963-02-01), Pilloton
patent: 3271104 (1966-09-01), Surls
patent: 3607007 (1971-09-01), Chiola
patent: 3717697 (1973-02-01), Gillchriest
ChemicaL Abstracts, vol. 62, 1965, abstract No. 3679h, Kulakova V. et al., "Binary Salts in the Production of Tungsten Compounds".
Li, K. et al., Tungsten, A.C.S. Monograph, No. 94, 3rd Edition, Reinhold Pub. Corp., New York, 1955, pp. 183, 184, 189-192.

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