Distribution of copper, cobalt, nickel between alloys and silica-unsaturated iron slags
Mining & Metallurgical Engineering
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Pure copper and the alloys: copper-cobalt and copper-nickel were equilibrated with pre-melted silica-unsatruated iron slags. Experiments were designed to yield information pertaining to the solubility of copper, and the distribution of cobalt and nickel in si1ica-unsaturated iron slags. The experiments were carried out in a closed system under controlled partial pressures of oxygen 10 10 to 10_S atmosphere, over a temperature range of 1473 to 1573K, and at a Fe/Si02 ratio of 1.49. The equilibrium reaction considered was: Me (1) + 1/x 0 2 (g) = MeOY (1). The results show that the alumina content of the slag decreases with increasing oxygen partial pressure, but decreases with increasing temperature. Alumina increases activity coefficients of copper, cobalt and nickel oxides. The presence of lime in Cu-Co and Cu-Ni systems increases the distribution coefficient of cobalt but decreases the distribution coefficient of nickel. Lime decreases the activity coefficient of cobalt oxide but increases the activity coefficient of nickel oxide.
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