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 TiO 2 ranging from 23 to 43 mass%, Al 2 O 3 9 mass% and CaO/SiO 2 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 TiO 2 , basicity, and temperature on viscosity were studied. The experimental results indicated that above the liquidus temperatures, the viscosities decrease with TiO 2 and basicity increasing. And increasing on CaO content should be more effective in depolymerizing slag structure and lowering viscosity compared to TiO 2 addition. Moreover TiO 2 behaved as a weak acid oxide in the experiment slags by XPS analysis. Based on the experimental data of CaO-SiO 2 -Al 2 O 3 -TiO 2 quaternary system, the activation energy of viscous flow was calculated between 115 and 141 kJ mol −1 depending on the slag composition.

Oxidation Kinetics and Mechanism of TiC with Simulated Blast‐Furnace Gases

“…The molecular energy of the reaction, which is greater than the overall molecular energy required to break through the energy barrier during the transition from reactant to product, is known as the activation energy of the reaction. [44] By taking the logarithm of both sides of Equation (11), we obtain Equation (12):…”

“…[3][4][5][6][7][8] However, the increase in TiO 2 content does not directly deteriorate the slag metallurgical properties. Numerous studies have shown that under neutral conditions, an increase in TiO 2 content can reduce the viscosity of the slag, [9][10][11][12][13] while under reducing conditions, the reduction of TiO 2 in the slag precipitates the highmelting-point solid Ti(C,N), which is the main reason for the deterioration of the slag metallurgical properties. [14] Therefore, to address the slag-viscosity problems caused by vanadium-bearing titanomagnetite smelting, it is necessary to eliminate or reduce the Ti(C,N) content in the slag.…”

Predictive models for molten slags viscosity and electrical conductivity based on directed chemical bonds concept

“…Many studies determine the effect of the amount and ratio of components in various slags [40,[49][50][51] on their physicochemical characteristics and their co-relationship. However, when studying the viscosity and electrical conductivity of slag as structurally sensitive properties ab-initio, it is possible to perform a more detailed assessment of the structural state of the melts.…”