Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1981-01-19
1981-12-01
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 58, 423561R, C01G 3900, C01G 4100
Patent
active
043036228
ABSTRACT:
A process is disclosed for recovering tungsten and molybdenum values from tungsten concentrates containing molybdenum in an amount at least about one-twentieth of the amount of contained WO.sub.3. The concentrate, generally a wolframite concentrate, is subjected to dissolution in hot NaOH solution to provide a pregnant liquor or solution containing tungsten and molybdenum values. The solution, after purification, is treated with a sulfide precipitation agent to precipitate MoS.sub.3 and some WS.sub.3 using a stoichiometric excess of a sulfide precipitating agent to produce a filtrate containing tungsten substantially free of molybdenum. The sulfide precipitate is dissolved in dilute NaOH solution and again precipitated using a stoichiometric deficient amount of the sulfide precipitating agent to produce a precipitate of MoS.sub.3 low in tungsten. The foregoing sulfide precipitation steps may be reversed.
REFERENCES:
patent: 2339888 (1944-01-01), Smith
patent: 3173754 (1965-03-01), Kurtak
patent: 3939245 (1976-02-01), Bellingham
patent: 3969484 (1976-07-01), Onozaki et al.
Beckstead Leo W.
Huggins Dale K.
Queneau Paul B.
Amax Inc.
Carter Herbert T.
Ciomek Michael A.
Kalil Eugene J.
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