Influence of Slag Containing Titanium on the Corrosion of Refractories Used in Blast Furnace Hearth

In order to clarify the influence of TiO₂-containing slag on the corrosion of refractories used in blast furnace hearth, the corrosion behavior of blast furnace hearth refractories such as carbon composite brick and corundum brick in CaO-SiO₂-MgO-Al₂O₃-Cr₂O₃-TiO₂ slag was investigated by using finger rotation method. The experimental result indicated that the comprehensive effects of slag penetration, the components of the carbon composite brick dissolution and slag-brick interaction eventually resulted in the corrosion of carbon composite brick. The corrosion of corundum brick was mainly due to the infiltration of slag and the dissolution of brick. According to the XRD results, the surface products of the carbon composite brick after corrosion were C, Al₂O₃, melilite, spinel, calcium-aluminate, Cr₇C₃ and TiC. The surface compositions of the corroded corundum brick were Al₂O₃, SiC, spinel, melilite and TiC. Compared with the corrosion behavior of carbon composite brick and corundum brick in slag containing TiO₂, due to the existence of C and SiC in carbon composite brick, the slag corrosion resistance of the carbon composite brick was better than that of corundum brick.