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The difficulty of smelting high-alumina iron ore is that the Al 2 O 3  content in the slag is too high, affecting the smooth running of the blast furnace. This work employed a combination of physical experiments and thermodynamic calculations to investigate the effect of Al 2 O 3  content on blast furnace slag properties, including phase transition, viscosity, liquidus temperature, and slag structure. The results showed that a spinel phase appeared when the Al 2 O 3  content was increased from 15wt% to 17wt%, and the liquidus temperature and viscosity of the BF slag were of therefore increased. For 17wt% to 20wt% Al 2 O 3  content, the viscosity, liquidus temperature, and the ratio of complex structure content to simple structure content increased rapidly owing to slag structure polymerisation. Additionally, the viscosity and liquidus temperature of high-alumina blast furnace slag were negatively correlated with TiO 2  content, but positively correlated with basicity. At approximately 5wt% TiO 2  content, Ti(C, N) with a high melting point appeared in the molten iron, resulting in a rapid increase in the viscosity. Thus, it is recommended that the TiO 2  content in the slag be less than 5wt% when the high-alumina iron ore is the main raw material of BF.

Effects of Al 2 O 3 content on the properties of BF slag and suitable fluxing regime for BF ironmaking with high Al 2 O 3 content