C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/147
C22B 34/34 (2006.01) C01G 39/06 (2006.01) C01G 41/00 (2006.01) C22B 34/30 (2006.01) C22B 34/36 (2006.01)
Patent
CA 1175662
F. 011 (Amax 969) CHEMICAL TREATMENT OF LOW-GRADE WOLFRAMITE CONCENTRATE HAVING HIGH Mo/WO3 RATIO ABSTRACT OF DISCLOSURE 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 con- tained WO3. 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 MoS3 and some WS3 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 MoS3 low in tungsten. The foregoing sulfide precipitation steps may be reversed.
394470
Beckstead Leo W.
Huggins Dale K.
Queneau Paul B.
Amax Inc.
Gowling Lafleur Henderson Llp
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