Development of a Quasi-chemical Viscosity Model for Fully Liquid Slags in the Al₂O₃–CaO–‘FeO’–MgO–SiO₂ System. Part 1. Description of the Model and Its Application to the MgO, MgO–SiO₂, Al₂O₃–MgO and CaO–MgO Sub-systems

Abstract

A structurally-based quasi-chemical viscosity model for fully liquid slags in the Al₂O₃–CaO–‘FeO’–MgO–SiO₂ system has been developed. The model links the slag viscosities to the internal structures of the melts through the concentrations of various Si_0.5O, Me_2/nⁿ⁺O and Me_1/nⁿ⁺Si_0.25O viscous flow structural units. The concentrations of these structural units are derived from a quasi-chemical thermodynamic model of the system. The model described in this series of papers enables the viscosities of liquid slags to be predicted within experimental uncertainties over the whole range of temperatures and compositions in the Al₂O₃–CaO–MgO–SiO₂ system.