C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/168
C22B 3/00 (2006.01) C01B 19/00 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1234289
ABSTRACT OF THE DISCLOSURE A process for separately recovering platinum group metal values, nickel values and copper from nickel-copper- iron sulphidic matte containing platinum group metals in- cludes leaching ground matte at atmospheric pressure in acidic nickel-copper sulphate solution at a temperature in the range of from about 75 to about 105°C and at a pH below about 4 initially under oxidizing conditions and subsequently under neutral or non-oxidizing conditions to cause dissolu- tion of nickel and iron, precipitation of copper as a copper sulphide and precipitation of dissolved platinum group metals. The copper, nickel and platinum group metal containing solids are separated from the nickel and iron containing sulphate solution and are leached in acidic nickel-copper sulphate solution under pressurized oxidizing conditions at a tem- perature of from about 120 to about 180°C to cause dissolu- tion of nickel and copper with minor dissolution of platinum group metals. The platinum group metal containing solids are separated from the nickel and copper containing sulphate solution, and copper is electrowon from the nickel and copper containing sulphate solution under conditions to cause catho- dic deposition of copper without significant deposition of nickel. Spent nickel and copper containing electrolyte solu- tion which also contains minor amounts of dissolved platinum group metals is recycled to the atmospheric leach and pressure leaching steps.
466221
Kerfoot Derik G.e.
Kofluk Russell P.
Weir Donald R.
Gowling Lafleur Henderson Llp
Sherritt International Consultants Inc.
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