Influence of TiO 2 on the viscosity of the molten slag and the confirmation of the acid–base property on TiO 2

Abstract

The viscosities of high titanium containing slag with TiO₂ ranging from 23 to 43 mass%, Al₂O₃ 9 mass% and CaO/SiO₂ ranging from 0.3 to 0.7 were experimentally determined by the rotating cylinder method. Experiments were conducted in the temperature range of 1573–1873 K. The effects of TiO₂, basicity, and temperature on viscosity were studied. The experimental results indicated that above the liquidus temperatures, the viscosities decrease with TiO₂ and basicity increasing. And increasing on CaO content should be more effective in depolymerizing slag structure and lowering viscosity compared to TiO₂ addition. Moreover TiO₂ behaved as a weak acid oxide in the experiment slags by XPS analysis. Based on the experimental data of CaO–SiO₂–Al₂O₃–TiO₂ quaternary system, the activation energy of viscous flow was calculated between 115 and 141 kJ mol⁻¹ depending on the slag composition.