Method of obtaining copper from copper-bearing ores

Details Method of obtaining copper from copper-bearing ores Method of obtaining copper from copper-bearing ores

C - Chemistry, Metallurgy

25

C

53/287, 204/69

C25C 1/12 (2006.01) C01G 3/00 (2006.01) C22B 3/30 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1098861

ABSTRACT OF THE DISCLOSURE The specification discloses a method for the treatment of sulphurized copper concentrates, which treatment is particul- arly applicable to copper ores such as bornite, chalcopyrite and chalcocite. It is well-known that these copper-bearing ores are always accompanied by gangue or other types of ore such as pyrites, quartz and calcite, the major portion of this gangue being eliminated during the preliminary stage in the concentra- tion of the ore. A concentrate is thus obtained which contains for example approximately 15 to 50% of copper and 5 to 35% of iron. The specification discloses a method for obtaining electrolytic copper from copper-bearing ores, characterized in that it comprises, in combination, the following stages: a) lixiviation of the initial product by an aqueous solution containing cupric chloride; b) separation into two parts of the solution resulting from the lixiviation stage a), one of said parts being subjected to oxidation by air at atmospheric pressure, and at a pH-value of between 1 and 3 and at a temperature above 90°C, with precipita- tion of the separated goethite, the resulting solution then being recycled to the lixiviation stage a); c) partial extraction of the copper contained in the other of said parts of the solution resulting from the lixiviation stage a), by contacting said solution with an organic phase containing a cationic solvent, said extraction being accompanied by oxida- tion by the injection of air; d) re-extraction of the copper contained in said organic phase by contacting the latter with an aqueous sulphuric acid solution and recycling the organic phase to the extraction stage c); and e) treatment of the copper sulphate solution obtained from the preceding stage to obtain, on the one hand, copper in valuable form, and, on the other, an aqueous sulphuric acid solution which is recycled to the re-extraction stage d), the major part of the aqueous phase which results from the stage c) at which copper is partially extracted being recycled to the lixiviation stage a).

226962

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