C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/284
C22B 15/00 (2006.01)
Patent
CA 1173655
ABSTRACT OF THE DISCLOSURE Magnetic and non-magnetic nickel-copper mattes and concentrates are treated by a two-stage acid pressure leach in which an initial phase of the first-stage leach is carried out under oxidizing conditions until up to 70%, preferably 60 - 70% of nickel values are extracted from the matte or concentrate, at which time the first-stage leach is continued under non-oxidizing conditions. Copper values are converted from a basic copper sulphate formed during the oxidizing phase of the leach to a less acid-soluble form as digenite during the non-oxidizing phase of the leach such that a resulting nickel-rich leach solution has reduced copper values. The said leach solution is suitable for purification by an atmospheric leach in which non-magnetic as well as magnetic nickel-copper mattes can be added for precipitation of dissolved copper and iron values.
390940
Kerfoot Derek G.e.
Maschmeyer Dennis G.
Weir Donald R.
Weizenbach Bauke
Gowling Lafleur Henderson Llp
Sherritt International Consultants Inc.
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