Effect of TiC and Ti(C,N) on the viscosity of CaO-SiO₂-8.25%MgO-15%Al₂O₃-30%TiO₂ slags

Vanadium-bearing titanomagnetite is a valuable mineral resource that as a raw material for blast-furnace ironmaking can lead to an increase in the mass fraction of TiO 2 in slag. However, TiO 2 will be excessively reduced in the process of ironmaking and produce the TiC and Ti(C,N) suspended in the slag, deteriorating the metallurgical properties of the slag. In this study, the effect of TiC and Ti(C,N) on the viscous flow characteristics of CaO-SiO 2 -8.25%MgO-15%Al 2 O 3 -30%TiO 2 slags was investigated by the rotating cylinder method. The research results showed that in the five-element slag system with a ∑TiO 2 content of 30% and the ratio of w (CaO)/ w (SiO 2 ) = 1.20, the viscosity of slag increases with the increase of TiC and Ti(C,N) mass fraction over a range of 1 to 7%, and the viscosities of system containing TiC were greater than that containing Ti(C,N). The melting temperature of slags was determined by calculating the second-order derivative of viscosity with temperature. It was found that the melting temperature of slag increases with the increase of TiC and Ti(C,N) content, and the melting temperature of slag containing a smaller particle size of TiC is more high. The viscous-flow activation energy E η of slags increases with the increase of TiC and Ti(C,N) content, which has a concomitant variation corresponding with the results of the effect of TiC and Ti(C,N) on viscosity. The revised Einstein-Roscoe equation has high prediction accuracy for the viscosity of solid-liquid slag systems containing corresponding solid particles.