Abstract
The solubility of cobalt in Cu2O-SiO2 slags held in silica crucibles and equilibrated with copper-cobalt alloys has been investigated for conditions of varying amounts of cobalt in the alloy charged at a temperature of 1523 K. The solution of cobalt in slag from its alloy is explained by the equation: Co (in alloy) + Cu2O (in slag) = 2 Cu (in alloy) + CoO (in slag)
The average distribution ratio, valid from 0.04 to 0.10 pct Co in the equilibrated metal, is: (Pct Co in slag)/(Pct Co in metal) = 400 ± 50 The results are explained with the help of SEM, X-ray diffraction and EDAX, which indicated that the phase assemblages encountered as charged cobalt is increased are: SiO2 + melt; Co2SiO4 + melt and CoO + Co2SiO2 + melt. In the last case, a coherent layer of cobalt silicate was found to have formed on the crucible surface. A tentative phase diagram of the ternary Cu2O-CoO-SiO2 system is presented. A change in the equation giving the activity coefficient of cobalt in Co-Cu alloys is suggested to bring calculated activity in agreement with the presence of CoO found experimentally as a separate phase.
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Ramana G. Reddy, formerly at The University of Utah
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Reddy, R.G., Healy, G.W. Distribution of cobalt between liquid copper and copper silicate slag at 1523 K. Metall Trans B 12, 509–516 (1981). https://doi.org/10.1007/BF02654321
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DOI: https://doi.org/10.1007/BF02654321