Influence of TiO2 on the Viscosity of a High Alumina Slag and on Carbon Brick Corrosion

The influence of TiO2 on viscosities of CaO–SiO2–MgO–Al2O3–Cr2O3‐based slags and the corrosion mechanism of carbon brick used in blast furnace hearth by slags was investigated in this work. From the viscosity experimental results, it was found that the viscosity decreased with the addition of TiO2. Furthermore, the critical temperature and activation energy for the viscous flow of slags also decreased with increasing content of TiO2. The corrosion of carbon brick depended on the component of the brick surface in contact to the molten slags. In the region consisting mainly of carbon, the corrosion of carbon brick may be caused by the oxidation of carbon and in lower carbon content area, the corrosion of brick was mainly caused by the dissolution and slag penetration. The corrosion of carbon brick by slags could be a consequence of carbon oxidation, brick dissolution and slag infiltration, and the degradation of carbon brick was accelerated with the addition of TiO2.