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<p>Vanadium titanomagnetite is a mineral resource with high economic value and strategic significance. Its main smelting process, the blast furnace-basic oxygen furnace process, generates high CO<sub>2</sub> emissions. The H<sub>2</sub>-rich oxygen blast furnace process has been demonstrated to be an effective technique to reduce CO<sub>2</sub> emissions in blast furnace operations. In this study, the H<sub>2</sub>-rich oxygen blast furnace condition was simulated combined with the softening–melting apparatus and the mass spectrometer, and the effects of H<sub>2</sub> content (0–30&#xa0;vol&#xa0;pct) on the cohesive zone metallurgical properties of vanadium titanomagnetite sinter in H<sub>2</sub>-CO gas mixtures were discussed from softening–melting behavior, permeability, TiC formation, slag foaming characteristics, gas utilization rates, and the softening–melting mechanism. The results indicate that with increasing H<sub>2</sub> content in gas mixtures, the reduction degree of the burden improved, accompanied by an increase in H<sub>2</sub> utilization. The softening interval shifted to higher temperatures because of the increased metallic iron content, which impeded further deformation of the burden. The melting starting temperature increased due to the liquid slag volume decreased. The decrease of [C] content in the hot metal leads to an increase in the dripping temperature. The permeability of the feed bed has improved greatly. Furthermore, the N<sub>2</sub>-free atmosphere avoided TiN formation, while CaTiO<sub>3</sub> prevented the carbonization of TiO<sub>2</sub> to TiC, leading to no foaming slag being observed.</p>

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Metallurgical Properties of Vanadium Titanomagnetite Sinter in the Cohesive Zone of H2-rich Oxygen Blast Furnace

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Buxin Chen,
  • Mao Chen,
  • Kaixuan Zhang,
  • Chenguang Bai,
  • Wenhao Yu,
  • Meilong Hu

摘要

Vanadium titanomagnetite is a mineral resource with high economic value and strategic significance. Its main smelting process, the blast furnace-basic oxygen furnace process, generates high CO2 emissions. The H2-rich oxygen blast furnace process has been demonstrated to be an effective technique to reduce CO2 emissions in blast furnace operations. In this study, the H2-rich oxygen blast furnace condition was simulated combined with the softening–melting apparatus and the mass spectrometer, and the effects of H2 content (0–30 vol pct) on the cohesive zone metallurgical properties of vanadium titanomagnetite sinter in H2-CO gas mixtures were discussed from softening–melting behavior, permeability, TiC formation, slag foaming characteristics, gas utilization rates, and the softening–melting mechanism. The results indicate that with increasing H2 content in gas mixtures, the reduction degree of the burden improved, accompanied by an increase in H2 utilization. The softening interval shifted to higher temperatures because of the increased metallic iron content, which impeded further deformation of the burden. The melting starting temperature increased due to the liquid slag volume decreased. The decrease of [C] content in the hot metal leads to an increase in the dripping temperature. The permeability of the feed bed has improved greatly. Furthermore, the N2-free atmosphere avoided TiN formation, while CaTiO3 prevented the carbonization of TiO2 to TiC, leading to no foaming slag being observed.