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<p>Hydrogen-based reduction, as a low-carbon iron ore reduction technology, has become a keyway to promote the green transformation of the steel industry. However, the in-depth understanding of this process at the microscopic level is insufficient, especially <i>in situ</i> observations under high temperature conditions are still scarce. <i>In situ</i> synchrotron X-ray diffraction (SXRD) technology can provide crucial information on phase transition and crystal structure evolution during iron ore reduction, which is particularly valuable in revealing the reduction mechanism in the dynamic process. In this study, we used <i>in situ</i> high-temperature SXRD to investigate the non-isothermal reduction of iron ore with hydrogen in the temperature range of room temperature (RT)-1000&#xa0;°C. The experimental results show that the reduction process follows the path of Fe<sub>2</sub>O<sub>3</sub> → Fe<sub>3</sub>O<sub>4</sub> → FeO → Fe, with the reaction during the FeO → Fe stage significantly influenced by hydrogen diffusion. For the first time, we observed the phase transformation of <i>α</i>-Fe and <i>γ</i>-Fe during the hydrogen reduction of iron ore at approximately 800&#xa0;°C. The study found that due to the nitriding effect, the temperature range of this phase transition is wider than the traditional 912&#xa0;°C transition point. The research results provide a valuable microscopic perspective on the iron ore reduction mechanism, provide support for the optimization of macroscopic industrial processes, and promote the steel industry to develop more efficient and sustainable hydrogen-based reduction processes.</p>

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In Situ SXRD Study of Phase Transformations and Reduction Kinetics in Iron Ore During Hydrogen-Based High-Temperature Reduction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月6日

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  • Yuzhao Wang,
  • Aidin Heidari,
  • Harishchandra Singh,
  • Graham King,
  • Shubo Wang,
  • Rafael Fillus Chuproski,
  • Marko Huttula,
  • Timo Fabritius,
  • Samuli Urpelainen

摘要

Hydrogen-based reduction, as a low-carbon iron ore reduction technology, has become a keyway to promote the green transformation of the steel industry. However, the in-depth understanding of this process at the microscopic level is insufficient, especially in situ observations under high temperature conditions are still scarce. In situ synchrotron X-ray diffraction (SXRD) technology can provide crucial information on phase transition and crystal structure evolution during iron ore reduction, which is particularly valuable in revealing the reduction mechanism in the dynamic process. In this study, we used in situ high-temperature SXRD to investigate the non-isothermal reduction of iron ore with hydrogen in the temperature range of room temperature (RT)-1000 °C. The experimental results show that the reduction process follows the path of Fe2O3 → Fe3O4 → FeO → Fe, with the reaction during the FeO → Fe stage significantly influenced by hydrogen diffusion. For the first time, we observed the phase transformation of α-Fe and γ-Fe during the hydrogen reduction of iron ore at approximately 800 °C. The study found that due to the nitriding effect, the temperature range of this phase transition is wider than the traditional 912 °C transition point. The research results provide a valuable microscopic perspective on the iron ore reduction mechanism, provide support for the optimization of macroscopic industrial processes, and promote the steel industry to develop more efficient and sustainable hydrogen-based reduction processes.