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<p>The desulfurization behavior of CaO–Al<sub>2</sub>O<sub>3</sub> particles in the molten steel was <i>in situ</i> observed using a high-temperature confocal scanning laser microscopy. The influence of liquid fraction of desulfurizers on the desulfurization rate was investigated. At the temperature of 1580 °C, liquid CaO–Al<sub>2</sub>O<sub>3</sub> desulfurizer had the best desulfurization ability. The partially liquid can also achieve the desulfurization. However, there was little desulfurization effect for solid desulfurizer particles. Solid CaO had the desulfurization effect, while the formation of CaS retarded the sulfur diffusion in the desulfurizer. Steel can hardly be desulfurized by solid CaO–Al<sub>2</sub>O<sub>3</sub> particles. For the partially liquid desulfurizer, with the increase of liquid fraction, the CaS content in the desulfurizer increased, improving the desulfurization rate of the desulfurizer. A kinetic model was established to predict the desulfurization of the steel. The sulfur diffusion coefficient in the desulfurizer was calculated as 8.82 × 10<sup>−10</sup> m<sup>2</sup>&#xa0;s<sup>−1</sup>.</p>

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In Situ Observation of the Desulfurization of the Molten Steel by CaO–Al2O3 Desulfurizers

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Chunjie She,
  • Guojun Chen,
  • Xingwei Pei,
  • Ying Ren,
  • Lifeng Zhang

摘要

The desulfurization behavior of CaO–Al2O3 particles in the molten steel was in situ observed using a high-temperature confocal scanning laser microscopy. The influence of liquid fraction of desulfurizers on the desulfurization rate was investigated. At the temperature of 1580 °C, liquid CaO–Al2O3 desulfurizer had the best desulfurization ability. The partially liquid can also achieve the desulfurization. However, there was little desulfurization effect for solid desulfurizer particles. Solid CaO had the desulfurization effect, while the formation of CaS retarded the sulfur diffusion in the desulfurizer. Steel can hardly be desulfurized by solid CaO–Al2O3 particles. For the partially liquid desulfurizer, with the increase of liquid fraction, the CaS content in the desulfurizer increased, improving the desulfurization rate of the desulfurizer. A kinetic model was established to predict the desulfurization of the steel. The sulfur diffusion coefficient in the desulfurizer was calculated as 8.82 × 10−10 m2 s−1.