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<p>The fluid flow, species transport, and chemical reaction between the mold flux and high-Al steel in the slab continuous casting mold are simulated by a multiphase model. The slag layer thickness and slag viscosity on the species concentration evolution are investigated. The results show that the SiO<sub>2</sub> concentration decreases from the slab’s narrow face to the submerged entry nozzle, and the Al<sub>2</sub>O<sub>3</sub> distribution presents the opposite trend. The slag composition mainly changes at the beginning of the reaction stage. As the reaction time extends beyond 10&#xa0;min, the SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> concentrations do not vary much. Since slag viscosity is higher than that of molten steel, the liquid velocity and mass transfer coefficient near the interface decrease with a increasing slag layer thickness. With lower slag viscosity, the mass transfer coefficient and the chemical reaction rate are enhanced. As the slag viscosity decreases from 0.5&#xa0;Pa·s to 0.1&#xa0;Pa·s, the residual SiO<sub>2</sub> concentration decreases from 23.5 wt.% to 21.1 wt.%, and the Al<sub>2</sub>O<sub>3</sub> concentration increases from 20.0 wt.% to 22.5 wt.%. Therefore, the mold flux property affects the evolution of slag concentration during the continuous casting process.</p>

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Mass Transfer in Slag-Steel Phase during High Al Steel Continuous Casting

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Dongbin Jiang,
  • Dejie Lu

摘要

The fluid flow, species transport, and chemical reaction between the mold flux and high-Al steel in the slab continuous casting mold are simulated by a multiphase model. The slag layer thickness and slag viscosity on the species concentration evolution are investigated. The results show that the SiO2 concentration decreases from the slab’s narrow face to the submerged entry nozzle, and the Al2O3 distribution presents the opposite trend. The slag composition mainly changes at the beginning of the reaction stage. As the reaction time extends beyond 10 min, the SiO2 and Al2O3 concentrations do not vary much. Since slag viscosity is higher than that of molten steel, the liquid velocity and mass transfer coefficient near the interface decrease with a increasing slag layer thickness. With lower slag viscosity, the mass transfer coefficient and the chemical reaction rate are enhanced. As the slag viscosity decreases from 0.5 Pa·s to 0.1 Pa·s, the residual SiO2 concentration decreases from 23.5 wt.% to 21.1 wt.%, and the Al2O3 concentration increases from 20.0 wt.% to 22.5 wt.%. Therefore, the mold flux property affects the evolution of slag concentration during the continuous casting process.