Effect of TiO₂ on the Liquid Zone and Apparent Viscosity of SiO₂-CaO-8wt%MgO-14wt%Al₂O₃ System

Abstract

The effect of TiO₂ on the liquids zone and apparent viscosity of SiO₂-CaO-8wt%MgO-14wt%Al₂O₃ system were studied in the present work. At fixed CaO/SiO₂ between 0.5 and 1.3, higher TiO₂ content decrease the slag viscosity indicating that TiO₂ additions up to 50 wt.% behaved as a viscosity-decrease agent by loosening the silicate network structure. The free running temperature increase at TiO₂ content from 10 wt.% to 30 wt.%. At fixed TiO₂ content of 20, 30 and 40 wt.%, increasing the CaO/SiO₂ resulted in lower viscosity due to the depolymerization of the structure. Four different viscosity models were discussed and two of them were employed to predict the viscosity and found that the Urbain’s Model agrees well with experimental data at high viscosity (4–12 dPa·s) and the KCC’s Model agrees well with experimental data at a lower viscosity (0–4 dPa·s).