Methods of separating and recovering copper from materials...

Details Methods of separating and recovering copper from materials... Methods of separating and recovering copper from materials...

C - Chemistry, Metallurgy

01

G

53/286, 23/90

C01G 3/10 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1074530

ABSTRACT OF THE DISCLOSURE Cuprous sulphate solutions, suitable for thermal or electochemical disproportionation to yield copper, are obtained by dissolving copper sulphites, such as Chevreul's salt or cuprous ammonium sulphite, in acetonitrile-water or 2 hydroxycyanoethane-water mixtures, preferably in the presence of cupric sulphate. This discovery is capable of a number of applications, one of which is the recovery of copper from chalcopyrite by the following five steps. An oxidising roast of chalcopyrite such as to produce either cupric sulphate and/or copper oxide, leaching of cupric sulphate from the calcine, precipitation of Chevreul's salt and/or other copper sulphites with a soluble salt of sulphurous acid, including bisulphites, dissolution of the copper sulphite as cuprous sulphate, using cupric sulphate in an acetonitrile-water solution as oxidant; precipitation of pure copper by thermal disproportionation of the cuprous sulphate solution. Acetonitrile and acidic cupric sulphate solution may be recycled. Advantages over conventional -2- processes, much as roast, leach-electrowin, or smelt, convert, electrorefine, include lower cost, lower energy comsumption, sulplur removal as ammonium sulphate or gypsum, rather than as sulphur dioxide, and rapid throughput. The nett reaction is: 2CuFeS2 + 4H20 + 2 02 + 8NH3 + 2Cu + 4(NH4)2SO4 + Fe203,

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