Tungsten recovery from tungsten ore concentrates by caustic dige

Details Tungsten recovery from tungsten ore concentrates by caustic dige Tungsten recovery from tungsten ore concentrates by caustic dige

1981-05-07

1982-10-12

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 61, C01G 4100

Patent

active

043538819

ABSTRACT:
Tungsten is recovered from tungsten ore concentrates in the form of sodium tungstate by a basic process in which ground ore is first digested in a sodium hydroxide solution followed by diluting the solution to dissolved sodium tungstate separating the solution from the caustic insoluble sludge and crystallizing soluble sodium tungstate, wherein the present invention permits improved recovery of tungsten from difficult to process ores by the process steps of comminuting said tungsten ore concentrate to a particle size less than about 200 mesh, adding the comminuted ore to an aqueous solution of sodium hydroxide at a temperature from about 10 to about 30 degrees centigrade, dispersing said comminuted ore in the aqueous solution of sodium hydroxide prior to digestion, digesting at a temperature of from about 75.degree. C. to about 150.degree. C. for a sufficient period of time to convert substantially all of the tungsten values to dissolvable sodium tungstate, and diluting the mixture to reduce the sodium hydroxide concentration to between about 4.5 and 5.5 molar at a temperature below about 90.degree. C. to substantially dissolve all of the sodium tungstate.

REFERENCES:
patent: 1293402 (1919-02-01), Giles
patent: 2339888 (1944-01-01), Smith
patent: 2459868 (1949-01-01), Bunnell et al.
patent: 3911077 (1975-10-01), Martin et al.
patent: 4092400 (1978-05-01), Zbranik et al.

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