Leaching of tungsten values from tri (alkaline earth metal) tung

Details Leaching of tungsten values from tri (alkaline earth metal) tung Leaching of tungsten values from tri (alkaline earth metal) tung

1977-01-27

1978-03-21

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423 56, 423 58, 423 61, 423593, 423606, 75 97R, 75101R, 75103, 75121, C01G 4100

Patent

active

040804208

ABSTRACT:
A process is provided for treating tri (alkaline earth metals) tungstates with an aqueous solution containing cations selected from ammonium, sodium and potassium ions and mixtures thereof, and anions selected from hydroxide, carbonate, bicarbonate, and phosphate ions and mixtures thereof, to form a tungstate salt which is soluble in the solution and an alkaline earth metal compound which is insoluble in the solution. The tri (alkaline earth metal) tungstate can be prepared from iron tungstate, manganese tungstate, and/or an alkaline earth metal tungstate or from ores or concentrates of these tungstates, by a high temperature treatment with an alkaline earth metal donor compound, such as calcium oxide. A preferred soluble tungstate is ammonium tungstate, which can be further processed to yield tungsten trioxide and/or tungsten.

REFERENCES:
patent: 1388857 (1921-08-01), Giles
patent: 2394362 (1946-02-01), Burwell et al.
patent: 3429693 (1969-02-01), Bauer et al.
patent: 3510291 (1970-05-01), Brush
patent: 3717697 (1973-02-01), Gillchriest et al.

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