Liquidus phase equilibrium data obtained in the recent study by the authors for the binary PbO–“Cu₂O”, “Cu₂O”–SiO₂ and the ternary PbO–“Cu₂O”–SiO₂ systems in equilibrium with metallic Cu or Pb–Cu alloy (as a part of research program on the characterization of the multicomponent PbO–ZnO–FeO–Fe₂O₃–“Cu₂O”–CaO–SiO₂ system), combined with phase equilibrium and thermodynamic data from the literature, have been used to obtain a self-consistent set of parameters of the thermodynamic models for all phases. The modified quasichemical model is used for the liquid slag phase. From these model parameters, the optimized ternary phase diagram is back calculated. Liquidus surface with cristobalite, tridymite and quartz (SiO₂), two immiscible liquids, cuprite (Cu₂O), lead silicates (PbSiO₃, Pb₂SiO₄, Pb₁₁Si₃O₁₇, Pb₅SiO₇), massicot (PbO) and copper plumbite Cu₂PbO₂ primary phase fields has been constructed. Available experimental data are described within uncertainties. Oxygen partial pressures and distribution of lead between slag and metal have been calculated.

作者在最近的研究中获得了与金属Cu平衡的二元PbO-“ Cu ₂ O”，“ Cu ₂ O” -SiO ₂和三元PbO-“ Cu ₂ O” -SiO ₂系统的液相线平衡数据。或Pb–Cu合金（作为表征多组分PbO–ZnO–FeO–Fe ₂ O ₃ –“ Cu ₂ O” –CaO–SiO ₂的研究计划的一部分系统），结合文献中的相平衡和热力学数据，已用于获得所有相热力学模型的一组自洽参数。改进的准化学模型用于液态渣相。根据这些模型参数，可以重新计算出最佳的三元相图。液相线表面有方石英，鳞石英和石英（SiO ₂），两种不混溶的液体，铜矿（Cu ₂ O），硅酸铅（PbSiO ₃，Pb ₂ SiO ₄，Pb ₁₁ Si ₃ O ₁₇，Pb ₅ SiO ₇） PbO）和铜铅咬Cu ₂ PbO ₂初级场已构建。在不确定性范围内描述了可用的实验数据。计算了氧分压和炉渣与金属之间铅的分布。