Modeling reaction between high-Al steel and slag with consideration of MgO-refractory dissolution into slag

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发表日期：

2026年2月8日

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Rong-Zhen Mo,
Chi-Hao Zhang,
Ying Ren,
Li-Feng Zhang

摘要

The dissolution of MgO-refractory into the slag had an obvious influence on the steel–slag reaction and the slag property, especially for high-aluminum steels. The dissolution behavior of MgO-refractory was investigated under various conditions, including the temperature, the initial steel composition, and the initial slag composition. A steel–slag–refractory kinetic model for high-aluminum steel was developed, which incorporated the process of MgO-refractory dissolution. The dependence of the MgO mass transfer coefficient k^r_MgO on temperature T during MgO-refractory dissolution process was established, as described by $\ln k_{{{\text{MgO}}}}^{{\text{r}}} = - 63,\!754/T + 24.38524$ $ln k_{MgO}^{r} = - 63, 754 / T + 24.38524$ . It was indicated that the MgO dissolution rate was significantly influenced by the temperature. A higher temperature increased the dissolution rate of MgO. The initial steel composition had a slight impact on the MgO dissolution rate. Additionally, the initial slag composition strongly impacted the MgO saturation concentration and the dissolution rate. A lower initial Al₂O₃/SiO₂ ratio increased the MgO dissolution rate. The steel–slag–refractory kinetic model accurately predicted the dissolution of MgO-refractory and the influence of dissolved MgO on the viscosity and composition change during steel–slag–refractory reactions. It was suggested that a higher temperature can hardly reduce the viscosity due to the dissolution of the MgO-refractory.