Estimation of Hydroxyl Capacity of Molten Silicates by Quadratic Formalism Based on the Regular Solution Model

Abstract

An attempt has been made to estimate the hydroxyl capacities of some molten silicates by the regular solution model of Lumsden, which has been extensively developed to be applied to slag metal reactions in steelmaking process by the authors. The slag systems discussed were of Na2O−SiO2, K2O−SiO2, Li2O−SiO2, CaO−SiO2 binaries and CaO−SiO2−Al2O3, CaO−SiO2−MgO, CaO−SiO2−MnO and CaO−SiO2−P2O5 ternaries. In the present work, it was assumed that the water vapor is dissolved in the slag as HO0.5, and the hydroxyl capacity is redefined as COH'=XHO0.5/(PH2O/P0)1/2, where, PH2O, P0 are partial pressure of water vapor in the gas phase and the atmospheric pressure (Pa), respectively