The reported experimental work on the systems PbO x -CaO and PbO x -CaO-SiO 2 in air is part of a wider research program that combines experimental and thermodynamic computer modeling techniques to characterize zinc/lead industrial slags. Extensive experimental investigation by high-temperature equilibration and quenching techniques followed by electron probe microanalysis was carried out in the temperature range 640 ЊC to 1500 ЊC (913 to 1773 K) and in the composition ranges 0 to 65 mol pct SiO 2 and 0 to 42 mol pct CaO. Liquidus and solidus data were reported for most of the primary phase fields. Liquidus surfaces in the systems CaO-Pb-O and PbO x -CaO-SiO 2 in air were completely reconstructed. Extensive solid solutions of PbO in ␣' dicalcium silicate and Ca 2 Pb 3 Si 3 O 11 were measured.

An experimental study on the ternary system PbO-ZnO-SiO 2 in air by high-temperature equilibration and quenching techniques followed by electron probe X-ray microanalysis was carried out as part of the wider research program on the six-component system PbO-ZnO-SiO 2 -CaO-FeO-Fe 2 O 3 , which combines experimental and thermodynamic computer modeling techniques to characterize zinc and lead industrial slags. Liquidus and solidus data were reported for all primary phase fields in the system PbO-ZnO-SiO 2 in the temperature range 640 ЊC to 1400 ЊC (913 to 1673 K).