Lead solubility in FeOxCaO-SiO2 slags at iron saturation

Experiments have been carried out to determine the equilibria between FeOx- CaO-SiO2 slag and lead metal in iron crucibles at temperatures ranging from 1473 to 1573 K. It has been found that the highest lead solubilities are o bserved in the silica-saturated iron silicate slags, while the lowest solub ilities are observed in the CaO-saturated calcium ferrite slags. The activi ty coefficient of PbO varies from 0.15 to 3, depending on the slag composit ion. Changes in temperature do not have a significant impact on the activit y coefficient. The activity of FeO and pet Fe3+/pct Fe2+ ratios have been d etermined as a function of slag composition. These new experimental data ha ve been incorporated into an optimized thermodynamic slag model using the c omputer package FACT.