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<p>Driven by increasing attention to carbon neutrality, the steel industry has been exploring the use of direct reduced iron, hot briquetted iron, and partially reduced iron in blast furnaces. This study experimentally investigated the reduction behavior of partially reduced iron, which has been less extensively studied than that of ores in a blast furnace. In this study, continuous reduction experiments using thermogravimetric analysis were conducted to evaluate how the pre-reduction degree (20 to 60&#xa0;pct) of partially reduced iron affects its reduction behavior in a simulated blast furnace environment at temperatures ranging from 973&#xa0;K to 1273&#xa0;K. Morphological analysis was conducted to confirm that the reoxidation in the upper shaft delayed further reduction in the lower shaft. Notably, when the pre-reduction degree of the partially reduced iron exceeded 33&#xa0;pct, the dense reoxidized layer significantly restricted gas diffusion, resulting in final reduction degree close to the pre-reduction degree. Based on these findings, the required amount of reducing gas for partially reduced iron charging was estimated. For stable operation in the softening and melting zones, the use of partially reduced iron with a pre-reduction degree of at least 60&#xa0;pct is recommended.</p>

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Understanding Abnormal Reduction Behavior of Partially Reduced Iron in the Blast Furnace

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Sohee An,
  • Gyokhang Park,
  • Taehyeon Kim,
  • Dong Joon Min

摘要

Driven by increasing attention to carbon neutrality, the steel industry has been exploring the use of direct reduced iron, hot briquetted iron, and partially reduced iron in blast furnaces. This study experimentally investigated the reduction behavior of partially reduced iron, which has been less extensively studied than that of ores in a blast furnace. In this study, continuous reduction experiments using thermogravimetric analysis were conducted to evaluate how the pre-reduction degree (20 to 60 pct) of partially reduced iron affects its reduction behavior in a simulated blast furnace environment at temperatures ranging from 973 K to 1273 K. Morphological analysis was conducted to confirm that the reoxidation in the upper shaft delayed further reduction in the lower shaft. Notably, when the pre-reduction degree of the partially reduced iron exceeded 33 pct, the dense reoxidized layer significantly restricted gas diffusion, resulting in final reduction degree close to the pre-reduction degree. Based on these findings, the required amount of reducing gas for partially reduced iron charging was estimated. For stable operation in the softening and melting zones, the use of partially reduced iron with a pre-reduction degree of at least 60 pct is recommended.