To investigate the erosion behavior of high-titanium slag on blast furnace hearth refractories, composite mullite bricks were taken as the research object, and the effects of TiO2 (mass fraction of 20%~26%), FeO (mass fraction of 0.5%~2.5%), and temperature (1 400~1 500 ℃) in the high-titanium slag on the erosion rate were systematically investigated using a static erosion method. The results indicate that as the TiO2 content, FeO content, and temperature increase, the erosion rate increases from 0.61 to 1.35 mm·h-1, from 0.71 to 1.03 mm·h-1, and from 0.14 to 0.84 mm·h-1, respectively. The erosion mechanism mainly involves bidirectional mass transfer: on the one hand, components such as CaO, MgO, and TiO2 in the slag penetrate into the brick and react; on the other hand, components of the brick dissolve and diffuse into the slag. Increasing the TiO2 and FeO contents and the temperature significantly reduces the viscosity of the high-titanium slag and improves its fluidity, thereby promoting the penetration of the slag into the brick and accelerating the chemical reactions between the brick and the oxides in the slag, which ultimately exacerbates the erosion. Furthermore, the temperature rise directly promotes the dissolution of components of the composite mullite bricks. SiC introduced into the bricks helps to enhance the erosion resistance of the material due to its poor wettability with the high-titanium slag.
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