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<p>This study employed a "reduction + modification" treatment technique for steel slag, using the carbon (C) and SiO<sub>2</sub> from blast furnace dust as reductants and modifiers to perform carbothermal reduction modification on converter hot-sprayed slag. The process simultaneously achieved slag self-pulverization and iron recovery. Chemical composition and phase analysis of the slag and dust were initially conducted to identify their primary phases. Subsequently, thermodynamic simulations, experimental studies, and multi-method analyses systematically investigated the effects of the dust-to-slag ratio, carbothermal reduction temperature, and holding time on the product pulverization rate. The results indicated that increasing the dust-to-slag ratio and reduction temperature enhanced pulverization, achieving up to 86.84% under optimal conditions. However, insufficient reduction at lower ratios resulted in negligible self-pulverization. Orthogonal experiments optimized processing parameters, revealing that pulverized products primarily comprised Ca<sub>2</sub>Al<sub>2</sub>SiO<sub>7</sub>, RO, and <i>γ</i>-Ca<sub>2</sub>SiO<sub>4</sub>, which were devoid of phosphorus. Non-pulverized residues predominantly contained nCa<sub>2</sub>SiO<sub>4</sub>·Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>. Furthermore, thermally stable Mn₂P facilitated high-temperature phosphorus reduction from nCa<sub>2</sub>SiO<sub>4</sub>·Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>, promoting slag self-pulverization.</p>

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Research on Carbon Thermal Reduction Modification and the Self-Pulverization Mechanism of Blast Furnace Dust Synergizing with Basic Oxygen Furnace Slag

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Shuai Hao,
  • Guoping Luo,
  • Yuanyuan Lu,
  • Shengli An,
  • Yifan Chai,
  • Wei Song

摘要

This study employed a "reduction + modification" treatment technique for steel slag, using the carbon (C) and SiO2 from blast furnace dust as reductants and modifiers to perform carbothermal reduction modification on converter hot-sprayed slag. The process simultaneously achieved slag self-pulverization and iron recovery. Chemical composition and phase analysis of the slag and dust were initially conducted to identify their primary phases. Subsequently, thermodynamic simulations, experimental studies, and multi-method analyses systematically investigated the effects of the dust-to-slag ratio, carbothermal reduction temperature, and holding time on the product pulverization rate. The results indicated that increasing the dust-to-slag ratio and reduction temperature enhanced pulverization, achieving up to 86.84% under optimal conditions. However, insufficient reduction at lower ratios resulted in negligible self-pulverization. Orthogonal experiments optimized processing parameters, revealing that pulverized products primarily comprised Ca2Al2SiO7, RO, and γ-Ca2SiO4, which were devoid of phosphorus. Non-pulverized residues predominantly contained nCa2SiO4·Ca3(PO4)2. Furthermore, thermally stable Mn₂P facilitated high-temperature phosphorus reduction from nCa2SiO4·Ca3(PO4)2, promoting slag self-pulverization.