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Effect of TiO2 on Viscosity and Sulfide Capacity of Blast Furnace Slag Containing Barium

As is well known, the viscosity and desulphurization ability of slag attract the most attention from metallurgical researchers based on their determinative role on production of blast furnace. For instance, the variation of slag viscosity will affect the desulphurization, slag-iron separation and operational stability.1) The desulphurization ability directly relates to quality of hot metal and properties of steel products, and the overall control for sulphur content in steel plant becomes stricter due to an increasing demand of the low sulphur steels.2) When keeping the temperature constant, the viscosity and desulphurization ability of slag are mainly determined by the chemical composition, not only relating to the contents of CaO, SiO2, MgO and Al2O3, but also to the minor components, such as TiO2 and BaO. At present, the study on the effects of minor components on slag properties still keeps insufficiency due to their diversity in slag. Thus, it is necessary to investigate the effect of minor components on the viscosity and desulphurization of slag. The special and large iron ore deposits containing barite are mainly located in minority area all over the world, including the Jingtieshan iron-ore deposit of China and Baharia iron-ore deposit of Egypt.3) Over the past decades, these iron ores are used as main raw material for ironmaking in some steel plants, such as Jiuquan Steel Plant of China, making approximate 2.5 wt% BaO exist in the slag due to the decomposition of barite. Furthermore, BaO content in the slag will present an increasing trend because of the Effect of TiO2 on Viscosity and Sulfide Capacity of Blast Furnace Slag Containing Barium