Scholarlink

<p>The laboratory experiment of the reaction involving high-aluminum steels and mold fluxes with 36&#xa0;pct SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> was studied. The variation of Na<sub>2</sub>O indicated that a lower Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> ratio led to a higher equilibrium concentration of Na<sub>2</sub>O in the mold flux. It was demonstrated that the reaction between Al and Na<sub>2</sub>O was progressively replaced by the reaction involving Al and SiO<sub>2</sub> when the Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> ratio decreased. During the steel-flux reaction, the SiO<sub>2</sub> content in the mold flux gradually decreased, shifting the rate-limiting step from mass transfer in the steel to mixed mass transfer in both the steel and mold flux. Hence, a multicomponent mixed-transport-control kinetic model was established to predict the composition change over the reaction time. The model considered the updating of the viscosity, density, and mass transport coefficients with composition at a given reaction time. The Equilib Module of FactSage was used to calculate thermodynamic equilibrium and the Macro-processing of FactSage was used to program and calculate the mass transfer within a time step. The kinetic model can be used to predict the composition evolution with reaction time.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Multicomponent Mixed-Transport-Control Kinetic and Thermodynamic Model for the Reaction Between High-Aluminum Steel and Mold Flux with Varied Al2O3/SiO2 Ratios: Experimental Result and Theoretical Model

  • 期刊论文

  • 发表日期：

    2025年2月12日

查看全文
  • Rongzhen Mo,
  • Hejun Zhang,
  • Ying Ren,
  • Lifeng Zhang

摘要

The laboratory experiment of the reaction involving high-aluminum steels and mold fluxes with 36 pct SiO2 and Al2O3 was studied. The variation of Na2O indicated that a lower Al2O3/SiO2 ratio led to a higher equilibrium concentration of Na2O in the mold flux. It was demonstrated that the reaction between Al and Na2O was progressively replaced by the reaction involving Al and SiO2 when the Al2O3/SiO2 ratio decreased. During the steel-flux reaction, the SiO2 content in the mold flux gradually decreased, shifting the rate-limiting step from mass transfer in the steel to mixed mass transfer in both the steel and mold flux. Hence, a multicomponent mixed-transport-control kinetic model was established to predict the composition change over the reaction time. The model considered the updating of the viscosity, density, and mass transport coefficients with composition at a given reaction time. The Equilib Module of FactSage was used to calculate thermodynamic equilibrium and the Macro-processing of FactSage was used to program and calculate the mass transfer within a time step. The kinetic model can be used to predict the composition evolution with reaction time.