A New Sulfide Capacity Model for CaO-Al₂O₃-SiO₂-MgO Slags Based on Corrected Optical Basicity

Abstract

A new sulfide capacity model for CaO-Al2O3-SiO2-MgO slags has been developed based on corrected optical basicity. The present model has taken charge compensation into consideration and postulated that Al exits in the form of [1/2Ca(AlO4)]4– when NCaO is higher than NAl2O3 in slag. The model predicted sulfide capacities agree well with experimental measured values for CaO-Al2O3, CaO-Al2O3-SiO2, CaO-Al2O3-MgO, and CaO-Al2O3-SiO2-MgO slags. A mean deviation of 3.23% is achieved for the present model in basic Al2O3 containing slags and this value is obviously lower than that of other models. The applicable range of the present model is given.