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<p>In order to reduce CO<sub>2</sub> emissions in the steel industry, promote carbon neutrality, improve the utilization of CO<sub>2</sub> in steelmaking, and enhance the stirring effect of molten steel, a thermodynamic analysis was conducted on the reactions of CO<sub>2</sub> with C, Cr, and V, and the selective oxidation mechanisms and behaviors of CO<sub>2</sub> in the Fe–C–Cr–V melt with initial element content and temperature were investigated using FactSage 8.1 software simulations in conjunction with tube furnace thermal experiments. The effective conversion ratio of CO<sub>2</sub> was calculated to assess the stirring effect of CO<sub>2</sub> injection into molten steel. The results indicate that the selective oxidation of CO<sub>2</sub> may be influenced by the smelting temperature and the atomic interface contact probability. This contact probability can be affected by the elemental composition of the molten steel and the partial pressure of CO. Furthermore, by controlling the composition of the molten steel and the steelmaking temperature, a higher CO<sub>2</sub> effective conversion (CEC) can be achieved, which increases the amount of CO gas and enhances the stirring effect of CO<sub>2</sub>. This research is anticipated to broaden the application of CO<sub>2</sub> in the production of high-quality special steels.</p>

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Thermodynamic Potentials of Selectively Oxidizing C, Cr, and V by CO2 Gas in Fe–C–Cr–V Melt Under Steelmaking Conditions

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Chunliang Gao,
  • Yiwei Cui,
  • Xinyu Meng,
  • Baochen Han,
  • Dan Liu,
  • Guangsheng Wei,
  • Yaqiang Li,
  • Bo Wang,
  • Liguang Zhu

摘要

In order to reduce CO2 emissions in the steel industry, promote carbon neutrality, improve the utilization of CO2 in steelmaking, and enhance the stirring effect of molten steel, a thermodynamic analysis was conducted on the reactions of CO2 with C, Cr, and V, and the selective oxidation mechanisms and behaviors of CO2 in the Fe–C–Cr–V melt with initial element content and temperature were investigated using FactSage 8.1 software simulations in conjunction with tube furnace thermal experiments. The effective conversion ratio of CO2 was calculated to assess the stirring effect of CO2 injection into molten steel. The results indicate that the selective oxidation of CO2 may be influenced by the smelting temperature and the atomic interface contact probability. This contact probability can be affected by the elemental composition of the molten steel and the partial pressure of CO. Furthermore, by controlling the composition of the molten steel and the steelmaking temperature, a higher CO2 effective conversion (CEC) can be achieved, which increases the amount of CO gas and enhances the stirring effect of CO2. This research is anticipated to broaden the application of CO2 in the production of high-quality special steels.