Effect of TiO2 on Viscosity and Sulfide Capacity of Blast Furnace Slag Containing Barium

The effect of TiO2 content ranging from 0 wt% to 4 wt% on the viscosity and sulfide capacity of CaO–SiO2–MgO–Al2O3–BaO–TiO2 slag system was investigated using the rotating spindle method and gas-slag equilibration technique, respectively. The measured sulfide capacity was further compared with the predicted values by some empirical models based on the corrected optical basicity when the effect of charge compensation effect of Ba2+ and Ca2+ was considered. The results show that the viscosity declines with TiO2 content increasing while keeping CaO/SiO2 ratio and other components contents constant, and TiO2 seems to be more effective in decreasing viscosity when polymerization degree of slag is higher. The sulfide capacity decreases with an increase in TiO2 content although the dynamic condition is improved due to the viscosity decreasing. The sulfide capacity is enhanced with the increasing corrected optical basicity and it can be predicted by using the modified predicted values based on Zhang’ model.