<報文>複雑硫化鉱の酸素加圧浸出におけるCu, Zn, Fe, Sの挙動について

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The leaching tests of complex bulk flotation concentrates containing sphalerite, chalcopyrite and pyrite in aqueous solution were carried out in an autoclave with mechanical agitation at elevated temperatures under oxygen pressure. In the present experiments the following conditions were used : [table]The experimental results are as follows : (1) The oxidation rates of sphalerite in bulk concentrates were all in linear relation under the conditions in this study. The Arrhenius plot of these rates corresponds to an activation energy of 11 kcal/mole. At a constant temperature, the rate of oxidation of sphalerite was found to be directly proportional to the oxygen partial pressure. The rate-determining step in the oxidation of sphalerite is apparently a heterogeneous process on the sulfide surface which involves an oxygen molecule. (2) After a greater portion of sphalerite was oxidized, the oxidation of chalcopyrite proceeded. The temperature coefficient of the oxidation rate of chalcopyrite corresponds to an activation energy of 7kcal/mole. At a lower temperature 150 to 170℃ the oxidation rate of chalcopyrite slowed down considerably, after 60 to 70 percents copper were extracted. It seems likely that the slow oxidation is due to the formation of elemental sulfur. (3) The major sulfide minerals in complex sulfide concentrates, sphalerite, chalcopyrite and pyrite, were oxidized in the following order : ZnS>CuFeS_2>FeS_2
東北大学の論文
1973-11-24