C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/276, 53/296
C22B 23/00 (2006.01) C22B 15/00 (2006.01) C22B 23/02 (2006.01)
Patent
CA 1183689
A B S T R A C T A method of recovering copper and nickel from sulphidic minerals con- taining copper, nickel and iron comprises the steps of roasting the mineral, preferably to provide magnetite; sulphating, for example with sulphuric acid, sulphur trioxide, metal sulphate and/or sulphur dioxide together with oxygen; and a subsequent leaching of the sul- phated material and recovery of copper from the leaching solution, for example by electrolysis. All or part of the leaching solution with its nickel content is recycled to the roasting stage, and the nickel content is removed in the form of nickel oxide together with the leaching residue, from which nickel can be recovered.
388686
Boliden Aktiebolag
Gowling Lafleur Henderson Llp
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