C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/342
C22B 13/00 (2006.01) C22B 5/02 (2006.01) C22B 13/02 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1084719
ABSTRACT The invention relates to a process for treating a Pb-Cu-S charge containing at least one of the elements Fe, Ag, Bi, Zn and Sn, said process comprising the step of (a) smelting the charge while maintaining conditions under which smelting produces a slag phase containing at least about 10 % Pb, a copper matte phase containing less than about 65 % Cu and a lead bullion phase, (b) separating from each other the slag, copper matte and lead bullion phases produced in step (a), (c) reducing the slag phase separated in step (b), in the molten state while maintaining conditions under which reducing decreases the lead content of the slag phase to a value lower than about 2 % thereby producing a lead bullion phase, and (d) separating from each other the slag and lead bullion phases produced in step (c), whereby obtaining in step (a) a matte phase which is almost free from Fe, collecting in step (a) most of the Ag in the matte and bullion phases, most of the Bi in the bullion phase and most of the Fe, Zn and Sn in the slag phase, and obtaining in step (c) a lead bullion which is almost free from Ag and Bi, a slag which is almost free from Zn and Sn and fly ashes containing most of the Zn.
286068
Fontainas Luc
Maes Robert
Macrae & Co.
Metallurgie Hoboken-Overpelt
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