Process for recovering high purity tungsten compositions from wo

Details Process for recovering high purity tungsten compositions from wo Process for recovering high purity tungsten compositions from wo

1977-04-11

1978-05-30

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

75101BE, 423 56, 423 58, 423593, C01G 4100

Patent

active

040924009

ABSTRACT:
A process for recovering tungsten values in the form of ammonium paratungstate from tungsten ores and ore concentrates, particularly wolframite ores and ore concentrates, incorporating a plurality of steps for necessary removal of impurities and formation of the product ammonium paratungstate. The steps of the process include grinding, caustic leaching, filtrations, chemical treatment including acidification particularly for the removal of silica impurities, further filtration, solvent extraction of the tungsten values, stripping of the tungsten values from the solvent solution in the form of ammonium paratungstate, and recovery of the ammonium paratungstate product. The caustic leaching step may be carried out in the substantial absence of oxygen.

REFERENCES:
patent: 1388857 (1921-08-01), Giles et al.
patent: 3052516 (1962-09-01), Drobnick et al.
patent: 3206303 (1965-09-01), Goren
patent: 3256057 (1966-06-01), Burwell
patent: 3256058 (1966-06-01), Burwell

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