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When copper converter slag is used as a raw material for iron smelting, copper and zinc must be removed from the slag as much as possible.In this study, the differences in chloridizing processes of Cu2S, Cu2O, ZnS and ZnO have been investigated by the weight change on chloridizing roasting and by X-ray diffraction of the roasted samples. Chlorine was obtained by decomposition of CaCl2·2H2O or NaCl mixed with the samples.The results are summarized as follows:(1) When Cu2S samples are roasted in air, CaCl2 is converted to CaSO4 and Cu2S is converted to CuCl by the following chemical formula:Cu2S+CaCl2+2O2=2CuCl+CaSO4.The volatilization temperature of CuCl formed by roasting is about 873 K.(2) When similar samples are roasted in pure oxygen, Cu2S is converted to CuO at 673∼773 K by the following reaction:Cu2S+CaCl2+3O2=2CuO+CaSO4+Cl2.CuO is converted to CuCl at 773 K.(3) The formation rate and the volatilization rate of CuCl will be balanced at about 873 K.(4) ZnCl2 is volatilized as soon as it is formed from ZnS or ZnO.(5) The chlorination temperature of oxides is about 100∼150 K higher than that of sulphides.
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Hiromichi Nagasue (1979) studied this question.
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