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<p>The dissolution characteristic of mold flux towards AlN inclusions in low-density high-strength steel directly influences the slab quality. In this work, the reactivity of CaO–Al<sub>2</sub>O<sub>3</sub>–BaO–Li<sub>2</sub>O–CaF<sub>2</sub> mold slag components (CaO + BaO: 39.5 to 46.5 wt&#xa0;pct, Al<sub>2</sub>O<sub>3</sub>: 27.0 to 35.5 wt pct, Li<sub>2</sub>O: 6.74 to 6.83 wt pct, CaF<sub>2</sub>: 18.09 to 24.81 wt pct) with AlN (0 to 15 wt pct additions), and the solubility of AlN in slags with varying melting and flow characteristics were explored. Results indicated that AlN could react with CaO, BaO, and Li<sub>2</sub>O to yield Al<sub>2</sub>O<sub>3</sub>, which simultaneously reacted with CaO, BaO, and Li<sub>2</sub>O to form corresponding 12CaO·7Al<sub>2</sub>O<sub>3</sub>, BaAl<sub>2</sub>O<sub>4</sub>, Ba<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>, LiAlO<sub>2</sub>, and Li<sub>5</sub>AlO<sub>4</sub> aluminates. However, in the complex slag system, competitive interactions between components affected these reactions, AlN only reacted with Li<sub>2</sub>O to form Al<sub>2</sub>O<sub>3</sub>, resulting in a decrease by 33.97 to 44.10 pct in Li<sub>2</sub>O and an increase by 15.27 to 27.00 pct in Al<sub>2</sub>O<sub>3</sub>, promoting the precipitation of 11CaO·7Al<sub>2</sub>O<sub>3</sub>·CaF<sub>2</sub>. Quantitative analysis revealed that slag with (CaO + BaO) of 46.13 wt pct dissolved 9.48 wt pct AlN at 15 wt pct addition, significantly higher than slags with (CaO + BaO) of 41.04 and 39.91 wt pct. Furthermore, this slag has a good lubrication performance exhibited a stronger ability to dissolve and absorb AlN, and its melting performance still met the performance for continuous casting production at 5 wt pct AlN.</p>

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Study on the Dissolution Characteristic of AlN in CaO–Al2O3–BaO–Li2O–CaF2 Mold Fluxes

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Xufeng Wang,
  • Yuanhui Qiu,
  • Qiangqiang Wang,
  • Quanfeng He,
  • Yan Luo,
  • Jianfeng Gu,
  • Shengping He

摘要

The dissolution characteristic of mold flux towards AlN inclusions in low-density high-strength steel directly influences the slab quality. In this work, the reactivity of CaO–Al2O3–BaO–Li2O–CaF2 mold slag components (CaO + BaO: 39.5 to 46.5 wt pct, Al2O3: 27.0 to 35.5 wt pct, Li2O: 6.74 to 6.83 wt pct, CaF2: 18.09 to 24.81 wt pct) with AlN (0 to 15 wt pct additions), and the solubility of AlN in slags with varying melting and flow characteristics were explored. Results indicated that AlN could react with CaO, BaO, and Li2O to yield Al2O3, which simultaneously reacted with CaO, BaO, and Li2O to form corresponding 12CaO·7Al2O3, BaAl2O4, Ba3Al2O6, LiAlO2, and Li5AlO4 aluminates. However, in the complex slag system, competitive interactions between components affected these reactions, AlN only reacted with Li2O to form Al2O3, resulting in a decrease by 33.97 to 44.10 pct in Li2O and an increase by 15.27 to 27.00 pct in Al2O3, promoting the precipitation of 11CaO·7Al2O3·CaF2. Quantitative analysis revealed that slag with (CaO + BaO) of 46.13 wt pct dissolved 9.48 wt pct AlN at 15 wt pct addition, significantly higher than slags with (CaO + BaO) of 41.04 and 39.91 wt pct. Furthermore, this slag has a good lubrication performance exhibited a stronger ability to dissolve and absorb AlN, and its melting performance still met the performance for continuous casting production at 5 wt pct AlN.