Method of obtaining copper from sulphurized concentrates

Details Method of obtaining copper from sulphurized concentrates Method of obtaining copper from sulphurized concentrates

C - Chemistry, Metallurgy

25

C

204/69

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

Patent

CA 1105410

ABSTRACT OF THE DISCLOSURE The specification discloses a method for the treatment of sulphurized copper concentrates, which treatment is particularly 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 concentration 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 which comprises the following stages a) lixiviation of said sulphurized concentrate by an aqueous solution containing cupric chloride formed in situ, at least in part, by oxidation, by means of hydrochloric acid and air, of the cuprous chloride solution resulting from lixiviation; b) partial extraction of the copper contained in the lixiviation solution resulting from the preceding stage, by contacting said lixiviation solution with an organic phase containing a cationic solution, said extraction being accompanied by oxidation by injection of air; c) re-extraction of the copper contained in said organic phase by contacting the latter with an aqueous solution of sulphuric acid and recycling the organic phase to the extraction stage b); and d) electrolysis of the copper sulphate solution obtained in the preceding stage, with a yield on the one hand of copper and on the other of an aqueous solution of sulphuric acid which is recycled to the re-extraction stage c), part at least of the aqueous phase which results from the partial copper extraction stage b), being recycled to the lixiviation stage a) and constituting a part of said cupric chloride solution.

226961

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