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<p>It is an important way to realize low carbon in China’s iron and steel industry by hydrogen-rich blast furnace smelting process. Sinter is the main blast furnace burden, and its reduction characteristics have a significant influence on ironmaking. The reduction behaviors, including reduction index (RI) and low-temperature reduction disintegration index (RDI), and the reduction mechanism of sinter in hydrogen-rich blast furnace were investigated. The results show that RI increased from 82.85 to 95.53&#xa0;wt.% with an increase in H<sub>2</sub> content from 0 to 30&#xa0;vol.%, and the main phase of the reduction product was metallic iron. In the research of RDI, when the H<sub>2</sub> content was&#xa0;increased from 0 to 20&#xa0;vol.%, RDI<sub>+3.15</sub> increased from 69.61 to 75.38&#xa0;wt.%, and the main reaction was the reduction of hematite to magnetite. At 600–950&#xa0;°C, the reduction of sinter in CO and hydrogen-rich atmospheres (H<sub>2</sub>:CO = 2) was both controlled by the first-order reaction model, and the apparent activation energy was 33.64 and 44.57&#xa0;kJ/mol, respectively.</p>

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Reduction behaviors and kinetic mechanism of sinter in hydrogen-rich blast furnace

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Wen-zhuo Ma,
  • Zheng-qi Guo,
  • De-qing Zhu,
  • Jian Pan,
  • Si-wei Li,
  • Jin Wang,
  • Tao Dong

摘要

It is an important way to realize low carbon in China’s iron and steel industry by hydrogen-rich blast furnace smelting process. Sinter is the main blast furnace burden, and its reduction characteristics have a significant influence on ironmaking. The reduction behaviors, including reduction index (RI) and low-temperature reduction disintegration index (RDI), and the reduction mechanism of sinter in hydrogen-rich blast furnace were investigated. The results show that RI increased from 82.85 to 95.53 wt.% with an increase in H2 content from 0 to 30 vol.%, and the main phase of the reduction product was metallic iron. In the research of RDI, when the H2 content was increased from 0 to 20 vol.%, RDI+3.15 increased from 69.61 to 75.38 wt.%, and the main reaction was the reduction of hematite to magnetite. At 600–950 °C, the reduction of sinter in CO and hydrogen-rich atmospheres (H2:CO = 2) was both controlled by the first-order reaction model, and the apparent activation energy was 33.64 and 44.57 kJ/mol, respectively.