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<p>Desulfurization of CaO–Al<sub>2</sub>O<sub>3</sub> particles in molten steel was observed <i>in situ</i> using high-temperature confocal scanning laser microscopy. The effects of the aluminum and silicon contents of molten steel on desulfurization were analyzed. When the total aluminum content in the steel increased from 6 to 1100 ppm, the CaS content in CaO–Al<sub>2</sub>O<sub>3</sub> particles increased from 2.1wt% to 84.84wt% after the reaction for 90 s. Furthermore, when the silicon content in the steel increased from 0.01wt% to 2.20wt%, the CaS content in CaO–Al<sub>2</sub>O<sub>3</sub> particles increased from 1.53wt% to 79.01wt% after the reaction for 90 s. This indicates that the increase in the aluminum and silicon contents of the steel promoted the desulfurization of CaO–Al<sub>2</sub>O<sub>3</sub> particles. A kinetic model was established to predict the CaO–Al<sub>2</sub>O<sub>3</sub> particles composition, and the diffusion coefficient of sulfur in CaO–Al<sub>2</sub>O<sub>3</sub> particles was 9.375 × 10<sup>−10</sup> m<sup>2</sup>·s<sup>−1</sup> at 1600°C, which provided a new method for the calculation of diffusion coefficient.</p>

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Instantaneous desulfurization of molten steel with varied aluminum and silicon by CaO–Al2O3 particles: In situ observation using confocal scanning laser microscopy

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Chunjie She,
  • Hejun Zhang,
  • Yanhui Zhang,
  • Ying Ren,
  • Lifeng Zhang

摘要

Desulfurization of CaO–Al2O3 particles in molten steel was observed in situ using high-temperature confocal scanning laser microscopy. The effects of the aluminum and silicon contents of molten steel on desulfurization were analyzed. When the total aluminum content in the steel increased from 6 to 1100 ppm, the CaS content in CaO–Al2O3 particles increased from 2.1wt% to 84.84wt% after the reaction for 90 s. Furthermore, when the silicon content in the steel increased from 0.01wt% to 2.20wt%, the CaS content in CaO–Al2O3 particles increased from 1.53wt% to 79.01wt% after the reaction for 90 s. This indicates that the increase in the aluminum and silicon contents of the steel promoted the desulfurization of CaO–Al2O3 particles. A kinetic model was established to predict the CaO–Al2O3 particles composition, and the diffusion coefficient of sulfur in CaO–Al2O3 particles was 9.375 × 10−10 m2·s−1 at 1600°C, which provided a new method for the calculation of diffusion coefficient.