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<p>The basic oxygen furnace (BOF) steelmaking process relies on the CaO-FeO-SiO<sub>2</sub> slag system, which has a high melting temperature and exhibits a slow lime dissolution rate. To address this limitation, this study developed a pre-synthesized fluorine-free flux from red mud using a phase-composition regulation strategy. An in situ high-temperature observation system was employed to investigate lime dissolution and wetting behaviors in slag modified by the proposed flux. The results indicated that, compared with a commercial calcium ferrite flux, the proposed flux enhanced the lime dissolution rate by approximately 1.6 times under identical conditions. This improvement was attributed to reduced interfacial mass-transfer resistance and improved slag–lime wettability, thereby increasing the reaction rate constant by 1.3–1.6 times. These characteristics also enable efficient dephosphorization with carbon retention during high-phosphorus hot metal pretreatment. Overall, the flux shows strong potential for industrial application in BOF steelmaking.</p>

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Dissolution and Wetting Behaviors of Lime with a Novel Fluorine-Free Flux: Mechanism and Dephosphorization Potential

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Zheng Zhao,
  • Yanling Zhang,
  • Jintao Gao,
  • Jie Li,
  • Qiuxin Ji

摘要

The basic oxygen furnace (BOF) steelmaking process relies on the CaO-FeO-SiO2 slag system, which has a high melting temperature and exhibits a slow lime dissolution rate. To address this limitation, this study developed a pre-synthesized fluorine-free flux from red mud using a phase-composition regulation strategy. An in situ high-temperature observation system was employed to investigate lime dissolution and wetting behaviors in slag modified by the proposed flux. The results indicated that, compared with a commercial calcium ferrite flux, the proposed flux enhanced the lime dissolution rate by approximately 1.6 times under identical conditions. This improvement was attributed to reduced interfacial mass-transfer resistance and improved slag–lime wettability, thereby increasing the reaction rate constant by 1.3–1.6 times. These characteristics also enable efficient dephosphorization with carbon retention during high-phosphorus hot metal pretreatment. Overall, the flux shows strong potential for industrial application in BOF steelmaking.