Phase equilibria of the PbO-“FeO”-SiO₂ and PbO-“FeO”-CaO-SiO₂ slags with liquid Pb metal, solid or liquid Fe metal and solid oxides [cristobalite and tridymite SiO₂, wustite (Fe,Ca)O_1+x, olivine (Fe,Ca)₂SiO₄, dicalcium silicate (Ca,Fe)₂SiO₄, wollastonite (Ca,Fe)SiO₃ and lime (Ca,Fe)O] were investigated at 1100-1689 °C. These conditions correspond to the minimum solubility of PbO in slag in presence of Pb and Fe metals at reducing conditions and represent the limit of lead smelting and slag cleaning process. High-temperature equilibration on silica or iron foil substrates, followed by quenching and direct measurement of Pb, Fe, Ca, and Si concentrations in the phases with the electron probe x-ray microanalysis (EPMA) was used to accurately characterize the system. Present results provide important basis for improvement of the thermodynamic models for all phases in this system.

PbO-“FeO”-SiO ₂和 PbO-“FeO”-CaO-SiO ₂渣与液态 Pb 金属、固态或液态 Fe 金属和固态氧化物 [方石英和鳞石英 SiO ₂、方铁矿 (Fe,Ca) 的相平衡O _1+x、橄榄石 (Fe,Ca) ₂ SiO ₄、硅酸二钙 (Ca,Fe) ₂ SiO ₄、硅灰石 (Ca,Fe)SiO ₃和石灰 (Ca,Fe)O] 在 1100-1689 °C 下进行了研究。这些条件对应于在还原条件下存在 Pb 和 Fe 金属时 PbO 在炉渣中的最小溶解度，代表了铅冶炼和炉渣清洁过程的极限。在二氧化硅或铁箔基材上进行高温平衡，然后使用电子探针 X 射线微量分析 (EPMA) 进行淬火和直接测量相中的 Pb、Fe、Ca 和 Si 浓度，以准确表征系统。目前的结果为改进该系统中所有相的热力学模型提供了重要依据。