Partition Equilibria of Lead and Antimony between Liquid Copper and MgO Saturated Cu2OSiO2, Cu2O-CaO and Cu2O-CaO-SiO2 Systems

The partition ratios of Pb and Sb between liquid copper and MgO saturated Cu2O-SiO2, Cu2O-CaO and Cu2O-CaO-SiO2 systems were measured from 1523 to 1673 K. For Cu2O-SiO2-MgOsatd. system at 1573 K, the effect of SiO2 content on partition ratios of Pb and Sb was small and their partition ratios were lower than 20. For Cu2O-CaO-MgOsatd. system, the partition ratio of Pb was not affected by the CaO concentration, while the partition ratio of Sb and the activity coefficient of SbO1.5 were dependent on the CaO concentration. When CaO concentration increased, the partition ratio of Sb increased and the activity coefficient of SbO1.5 decreased. For Cu2O-CaO-SiO2-MgOsatd. system, two liquid phases, which one was calcium silicate rich phase and another was Cu2O rich phase, were observed at 1573 K. The partition ratios of Pb and Sb between calcium silicate phase and liquid copper were dependent on the ratio of (mass%CaO)/(mass%SiO2). When the ratio (mass%CaO)/(mass%SiO2) increased, the partition ratio of Pb decreased and that of Sb increased.