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The effect of TiO 2 and the MgO/Al 2 O 3 ratio on the viscosity, heat capacity, and enthalpy change of CaO-SiO 2 -Al 2 O 3 -MgO-TiO 2 slag at constant heat input was studied. The variation of slag structure was analyzed by the calculation of activation energy and FTIR spectrum measurements. The results showed that the heat capacity and enthalpy change of the slag decreased with the increase of TiO 2 content. Under constant heat supply, the fluctuations in slag temperature were relatively apparent, and the temperature of slag increased as the TiO 2 content increased. The viscosity of slag decreased due to the increase in slag temperature. Increasing the MgO/Al 2 O 3 ratio could decrease the temperature and viscosity of slag. The effect of increasing the MgO/Al 2 O 3 ratio on the viscosity was more pronounced than the decreasing temperature caused by increasing the MgO/Al 2 O 3 ratio. The apparent activation energy decreased with increasing TiO 2 content and MgO/Al 2 O 3 ratio. The Ti-O bonds formed with TiO 2 addition, and the Ti-O bonds were weaker than Si-O bonds, which resulted in the decrease in heat capacity and viscosity of slag.

Thermodynamic Properties, Viscosity, and Structure of CaO–SiO2–MgO–Al2O3–TiO2–Based Slag