A Semi-empirical Model for Viscosity Estimation of Molten Slags in CaO–FeO–MgO–MnO–SiO2 Systems

Abstract

A semi-empirical viscosity model was proposed for silicate melts in this paper. The binary silicate melts MO–SiO2 (MO is a bivalent metal oxide) was treated as 2MO·SiO2–“SiO2” or “MO”–2MO·SiO2 system when XMO≤0.667 or XMO>0.667. Viscous activation energy of silicate melts was divided into three parts which come from the contributions of “SiO2”, “MO” and 2MO·SiO2. A relationship between pre-exponential factor A and activation energy E in Arrenhius equation was used for silicate melts. The model parameters were extracted from binary silicate melts and applied in ternary or higher order systems. The viscosities of silicate melts within CaO–MgO–MnO–FeO–SiO2 system were estimated using the present model. Good agreements have been achieved between calculated values and measured values. The mean deviation Δ of present model for slag systems investigated in our study is in the vicinity of 20%.