Thermodynamic Properties and Viscosities of High-Titanium Slags

The influence of TiO 2 , binary basicity and Al 2 O 3 /TiO 2 ratio on the heat capacity, enthalpy and slag fluidity of CaO–SiO 2 –MgO–Al 2 O 3 –TiO 2 -based slag at 1 693 K, 1 723 K, and 1 753 K (1 420 ° C, 1 450 ° C, and 1 480 ° C) was investigated in this work. From the calculation results, it was found that the heat capacity of the slag increased with the increasing of TiO 2 content and the Al 2 O 3 /TiO 2 ratio and with the decreasing of basicity in the experimental temperature range. Enthalpy change increased with the increasing Al 2 O 3 /TiO 2 ratio and the decreasing of TiO 2 content. With the increasing of basicity, the slag temperature rises slightly and the viscosity decreases along with it. Additionally, the larger the basicity, the smaller the viscosity fluctuation under heat decrement. Therefore, a proper increase in basicity contributes to reduce viscosity fluctuation, for the current slag system, the appropriate basicity should be 1.15–1.20. Besides, the fluctuation of the temperature reaches a small value around the Al 2 O 3 /TiO 2 ratio is 0.6, and in metallurgical production, the heat input should be adjusted in time according to titanium content charge fluctuations, thus ensuring good fluidity and an adequate reaction between the slag and metal. The above experimental results can provide a reference for ironmaking enterprises using more vanadium–titanium magnetite ore.