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<p>Currently, the supply of high Fe grade and low gangue pellet feeds has become increasingly tight due to yearly large-scale consumption of iron ores worldwide, which will inevitably restrict the development of iron ore pelletizing process and carbon dioxide emissions mitigation of the steel industry. To promote utilization of high silica pellet feeds, the roasting behavior of high silica acid pellets with varying binary basicity (<i>w</i>(CaO)/<i>w</i>(SiO<sub>2</sub>) = 0.01, 0.20, 0.35, 0.50) through the straight-grate process was examined, and its metallurgical performance in blast furnace and gas-based shaft furnace was also evaluated. The results show that all fired pellets achieved optimal strength by roasting at 1225&#xa0;°C for 10&#xa0;min at basicity of 0.35. The metallurgical performance tests under blast furnace and Midrex direct reduction conditions indicate that the addition of a proper quantity of calcium flux improves the pellet reducibility and low-temperature reduction degradation performance, decreases the reduction swelling index and narrows the softening and melting range with better bed permeability at desirable basicity of 0.20 and 0.35. However, further increasing the basicity to 0.50 presents negative impacts on the pellet induration characteristics and metallurgical properties due to excessive formation of liquid phase inhibiting interconnection of hematite particles. Thus, the fired pellets exhibit poorer resistance and structural stability to the mechanical stress and lattice transformation during reduction and cooling process.</p>

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Induration characteristics of high silica magnetite pellets and its metallurgical performance in blast furnace and gas-based shaft furnace

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Bo-Hua Li,
  • Jian Pan,
  • Cong-Cong Yang,
  • De-Qing Zhu,
  • Zheng-Qi Guo,
  • Meng-Jie Xu

摘要

Currently, the supply of high Fe grade and low gangue pellet feeds has become increasingly tight due to yearly large-scale consumption of iron ores worldwide, which will inevitably restrict the development of iron ore pelletizing process and carbon dioxide emissions mitigation of the steel industry. To promote utilization of high silica pellet feeds, the roasting behavior of high silica acid pellets with varying binary basicity (w(CaO)/w(SiO2) = 0.01, 0.20, 0.35, 0.50) through the straight-grate process was examined, and its metallurgical performance in blast furnace and gas-based shaft furnace was also evaluated. The results show that all fired pellets achieved optimal strength by roasting at 1225 °C for 10 min at basicity of 0.35. The metallurgical performance tests under blast furnace and Midrex direct reduction conditions indicate that the addition of a proper quantity of calcium flux improves the pellet reducibility and low-temperature reduction degradation performance, decreases the reduction swelling index and narrows the softening and melting range with better bed permeability at desirable basicity of 0.20 and 0.35. However, further increasing the basicity to 0.50 presents negative impacts on the pellet induration characteristics and metallurgical properties due to excessive formation of liquid phase inhibiting interconnection of hematite particles. Thus, the fired pellets exhibit poorer resistance and structural stability to the mechanical stress and lattice transformation during reduction and cooling process.