Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1985-03-11
1986-02-18
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
423 22, 423 27, 423 36, 423 41, 423 42, 423 45, 423146, 423150, 423509, 75108, 75117, 75118R, 75119, 75121, 75115, 204106, 204109, 204112, C22B 1104, C01G 300, C01G 5300
Patent
active
045712620
ABSTRACT:
A process for separately recovering platinum group metal values, nickel values and copper from nickel-copper-iron sulphidic matte containing platinum group metals includes leaching ground matte at atmospheric pressure in acidic nickel-copper sulphate solution at a temperature in the range of from about 75.degree. to about 105.degree. C. and at a pH below about 4 initially under oxidizing conditions and subsequently under neutral or non-oxidizing conditions to cause dissolution 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 temperature of from about 120.degree. to about 180.degree. C. to cause dissolution 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 cathodic deposition of copper without significant deposition of nickel. Spent nickel and copper containing electrolyte solution which also contains minor amounts of dissolved platinum group metals is recycled to the atmospheric leach and pressure leaching steps.
REFERENCES:
patent: 4038362 (1977-07-01), Gusy
patent: 4266972 (1981-05-01), Redondo-Abad et al.
patent: 4304644 (1981-12-01), Victorovich et al.
Kerfoot Derek G. E.
Kofluk Russell P.
Weir Donald R.
Delbridge Robert F.
Doll John
Fors Arne I.
Sherritt Gordon Mines Limited
Stoll Robert L.
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