EXPERIMENTAL-STUDY OF PHASE-EQUILIBRIA IN THE SYSTEMS PBOX-CAO AND PBOX-CAO-SIO2

The reported experimental work on the systems PbOx-CaO and PbOx-CaO-Si O2 in air is part of a wider research program that combines experiment al and thermodynamic computer modeling techniques to characterize zinc /lead industrial slags. Extensive experimental investigation by high-t emperature equilibration and quenching techniques followed by electron probe microanalysis was carried out in the temperature range 640 degr ees C to 1500 degrees C (913 to 1773 K) and in the composition ranges 0 to 65 mol pet SiO2, and 0 to 42 mol pet CaO, Liquidus and solidus da ta were reported for most of the primary phase fields. Liquidus surfac es in the systems CaO-Pb-O and PbOx-CaO-SiO2 in air were completely re constructed. Extensive solid solutions of PbO in alpha' dicalcium sili cate and Ca2Pb3Si3O11 were measured.