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<p>The instantaneous desulfurization of CaO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> slag particles in the molten steel was in situ observed using a high-temperature confocal scanning laser microscope. The desulfurization effect of CaO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> slags with different compositions was discussed. The influence of CaO/Al<sub>2</sub>O<sub>3</sub> and CaO/SiO<sub>2</sub> on the desulfurization effect was analyzed. It was shown that in the liquid phase range, the higher CaO/SiO<sub>2</sub> and CaO/Al<sub>2</sub>O<sub>3</sub> can significantly improve the desulfurization effect of the slag. A dimensionless desulfurization index <i>S</i><sub>index</sub> was introduced to evaluate the desulfurization ability of CaO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> slags quantitatively. The <i>S</i><sub>index</sub> values of CaO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> with different compositions at 1550&#xa0;°C were calculated. It was suggested to use (65%–75%)CaO–(0–20%)SiO<sub>2</sub>–(20%–40%)Al<sub>2</sub>O<sub>3</sub> slags to improve the molten steel desulfurization.</p>

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Effect of CaO/SiO2 and CaO/Al2O3 in CaO–Al2O3–SiO2 particles on desulfurization of molten steel studied by confocal scanning laser microscopy

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Chun-jie She,
  • Guo-jun Chen,
  • Li-feng Zhang,
  • Ying Ren

摘要

The instantaneous desulfurization of CaO–Al2O3–SiO2 slag particles in the molten steel was in situ observed using a high-temperature confocal scanning laser microscope. The desulfurization effect of CaO–Al2O3–SiO2 slags with different compositions was discussed. The influence of CaO/Al2O3 and CaO/SiO2 on the desulfurization effect was analyzed. It was shown that in the liquid phase range, the higher CaO/SiO2 and CaO/Al2O3 can significantly improve the desulfurization effect of the slag. A dimensionless desulfurization index Sindex was introduced to evaluate the desulfurization ability of CaO–Al2O3–SiO2 slags quantitatively. The Sindex values of CaO–Al2O3–SiO2 with different compositions at 1550 °C were calculated. It was suggested to use (65%–75%)CaO–(0–20%)SiO2–(20%–40%)Al2O3 slags to improve the molten steel desulfurization.