C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/291
C22B 15/00 (2006.01) C01G 3/00 (2006.01) C22B 3/30 (2006.01)
Patent
CA 1050279
ABSTRACT A method of extracting copper from an aqueous ammoniacal leach solution which is derived from the leaching of copper dross and which contains impurity cations, comprising contacting the leach solution with a copper-selective organic solvent to take copper into the organic phase and then stripping the copper from the organic solvent into an aqueous phase, the organic solvent being washed with a dilute acid before stripping, wherein before the organic solvent contacts the dilute acid the concentration of copper in the organic solvent is reduced below a level at which poor phase separation occurs under acid conditions.
232455
I.s.c. Smelting Limited
Metallurgical Processes Limited
Na
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