Abstract
The solubilities of CuO (at 1 atm oxygen pressure) and of Cu2O (in equilibrium with Cu) were measured in cryolite-alumina melts at 1020 °C as functions of the alumina content of the melt, and of the NaF/AlF3 ratio in melts saturated with alumina. The results enable separation of the contributions of Cu(I) and Cu(II) species in solution, and are interpreted in terms of the solute species CuF, CuAlO2, and Na2CuF4. In alumina-saturated melts with NaF/AlF3 = 3 the solubility of CuO is given by log (wt% Cu) = −9664/T + 7.0128, where T is temperature in kelvins, and of Cu2O by log (wt% Cu) = −8677/T + 6.173.
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