C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/06 (2006.01) C22B 15/00 (2006.01) C22B 23/00 (2006.01)
Patent
CA 2251433
There is disclosed a process for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte undergoes one or more steps of sulphuric acid leaching at atmospheric pressure to produce a nickel sulphate solution and an iron and/or arsenic containing copper-rich sulphide residue. The copper-rich sulphide residue is repulped in sulphuric acid solution to selectively redissolve most of the iron and arsenic and the iron and arsenic containing solution is separated from the copper-rich residue. The iron and arsenic are largely precipitated from the leach solution in a pressure hydrolysis step and the iron and arsenic containing precipitate is separated and discarded. The iron and arsenic-depleted solution is recombined with the copper-rich sulphide residue from the acid repulp step and the resulting slurry is treated in a non-oxidizing pressure leach in which nickel arsenic and iron are extracted. The process produces a nickel sulphate solution containing low levels of copper, iron and arsenic and a copper sulphide product containing low levels of nickel, iron, arsenic and other impurities.
Kerfoot Derek George Eagland
Makwana Manher Mohan
Stiksma John
Dynatec Corporation
Gowling Lafleur Henderson Llp
Sherritt International Corporation
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