Influence of Cr₂O₃ and Basicity on Viscosity of Ti-Bearing Blast Furnace Slag

The influence of Cr₂O₃ and basicity on the viscosity of CaO–SiO₂-15 wt% Al₂O₃-9 wt% MgO-22 wt% TiO₂–Cr₂O₃ slag was investigated in the temperature range of 1673–1773 K. The viscosity decreased with increasing basicity at fixed content of Cr₂O₃ due to the depolymerization of silicon structure. At a fixed content of basicity, the viscosity decreased with increasing Cr₂O₃ when the mass percentage of Cr₂O₃ was below 1%. Different models were also used to predict the effect of Cr₂O₃ on the viscosity of blast furnace slag, and the results show that the optical basicity model agrees well with the experimental values. With the initial addition of Cr₂O₃ content, the slag melting temperature increased from 1660 to 1673 K. When the basicity increased from 1.0 to 1.2, the slag melting temperature increased from 1655 to 1720 K.