Influence of TiO₂ on the viscosity of the molten slag and the confirmation of the acid–base property on TiO₂

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.

KEYWORDS:

• TiO₂
• viscosity
• XPS
• oxide

Acknowledgements

Financial supports from the National Science Foundation of China (NSFC, No. 51874029 and No. 51974287) is gratefully acknowledged.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

Financial supports from the National Science Foundation of China (NSFC), [grant number 51874029] and [grant number 51974287] is gratefully acknowledged. Innovative Research Group Project of the National Natural Science Foundation of China (CN)