Effects of Cr2O3, FeO and CaO/SiO2 Ratio on the Apparent Viscosity of CaO-SiO2-MgO-MnO-FeO-Cr2O3 Slags

In this study, the effects of Cr2O3, FeO and CaO/SiO2 ratio on the apparent viscosity of the CaO-SiO2-MgO-MnO-FeO-Cr2O3 slags are investigated at 1500 degrees C. Apparent viscosity of the slags is measured using the rotating cylinder method and the liquid and solid phases are calculated using the thermodynamic calculation software FactSage. The experimental results showed that the apparent viscosity of slags increases with increasing CaO/SiO2 ratio and Cr2O3 content and decreases with the FeO addition. The thermodynamic calculations results showed that Cr2O3 content has a minor effect on the mass fraction of liquid phases, nevertheless it can promote the formation of spinels resulting in increased amount of solid phases as well as, increased slag apparent viscosity. The liquid slag phases were increased with increasing of FeO content therefore, the apparent viscosity of the slag was reduced. However, the liquid slag phases were decreased with increasing of CaO/SiO2 ratio, which resulted in increased slag apparent viscosity.