Development of a Quasi-chemical Viscosity Model for Fully Liquid Slags in the Al₂O₃–CaO–‘FeO’–MgO–SiO₂ System. The Experimental Data for the ‘FeO’–MgO–SiO₂, CaO–‘FeO’–MgO–SiO₂ and Al₂O₃–CaO–‘FeO’–MgO–SiO₂ Systems at Iron Saturation

Abstract

A structurally-based quasi-chemical viscosity model has been developed for the Al₂O₃–CaO–‘FeO’–MgO–SiO₂ system. The model links the slag viscosity to the internal structure of melts through the concentrations of various anion/cation Si_0.5O, Me_2/nⁿ⁺O and Me_1/nⁿ⁺Si_0.25O viscous flow structural units. The concentrations of structural units are derived from the quasi-chemical thermodynamic model.
The focus of the present paper is the analysis of experimental data for fully liquid slags in the ‘FeO’–MgO–SiO₂, CaO–‘FeO’–MgO–SiO₂ and Al₂O₃–CaO–‘FeO’–MgO–SiO₂ systems in equilibrium with metallic iron. Model parameters for the quasi-chemical viscosity model for the system Al₂O₃–CaO–‘FeO’–MgO–SiO₂ are presented. The model has been optimised for the whole composition range at temperatures between 1423 K and 1873 K.