Oxidation-leaching of chalcopyrite

Details Oxidation-leaching of chalcopyrite Oxidation-leaching of chalcopyrite

C - Chemistry, Metallurgy

22

B

53/289

C22B 15/00 (2006.01) C01G 3/10 (2006.01) C01G 49/06 (2006.01)

Patent

CA 1037261

A B S T R A C T A method is described for the oxidation-leaching of chalcopyrite concentrates at high temperatures and pressures for the extraction of copper values as copper sulfate in which temperatures are maintained between about 425° and 450°F, oxygen partial pressures of between about 50 and 200 psi are provided, and levels of acidity are permitted to increase above about 50 grams of H2SO4 per liter in order to obtain maximum rates of extraction of virtually all of the copper. Thereafter, while maintaining the temperature and pressure at elevated levels, the acidity of the slurry is reduced to between about 10 and 40 grams of H2SO4 per liter in order to obtain reduction of dissolved iron to optimal levels. The resulting slurry is then cooled and further processed for the production of a very pure copper sulfate solution.

218923

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