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MgO-fluxed pelletsFluxed Pellets areMgO-fluxed pellets widely used in blast furnace ironmaking due to their excellent metallurgical propertiesMetallurgical properties. However, MgO-fluxed pelletsFluxed Pellets require high roastingRoasting temperatureTemperature control. A roastingRoasting temperatureTemperature that is too low may not allow for adequate consolidation, while a temperatureTemperature that is too high may lead to the bonding of the pelletsPellet and affect the quality of the pelletsPellet. This study used magnetiteMagnetite pure mineral and MgO reagents to study the effect of different Mg/Fe molar ratios on the phase transformationPhase transformation of roasted products. The diffusionDiffusion rate of Mg2+ at the reaction interface of the Fe3O4–MgO system under different atmosphere conditions is investigated. The results showed that the higher Mg/Fe ratio is favorable for generating MgxFe3–xO4, and the presence of Mg2+ will hinder the Fe2O3 grain connection. It is unfavorable to the Fe2O3 grain growth. At 1200 ℃, the diffusionDiffusion rate of Mg2+ at the interface of the Fe3O4–MgO system in a nitrogen atmosphere was faster than that in an air atmosphere.

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Effect of MgO on the Oxidation Kinetics of Magnetite

  • 会议论文

  • 发表日期：

    2025年

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  • Zijian Su,
  • Qijie Guo,
  • Yuanbo Zhang,
  • Nanyong Wu,
  • Fang Chen,
  • Xiaoguang Bai,
  • Guowei Fu

摘要

MgO-fluxed pelletsFluxed Pellets areMgO-fluxed pellets widely used in blast furnace ironmaking due to their excellent metallurgical propertiesMetallurgical properties. However, MgO-fluxed pelletsFluxed Pellets require high roastingRoasting temperatureTemperature control. A roastingRoasting temperatureTemperature that is too low may not allow for adequate consolidation, while a temperatureTemperature that is too high may lead to the bonding of the pelletsPellet and affect the quality of the pelletsPellet. This study used magnetiteMagnetite pure mineral and MgO reagents to study the effect of different Mg/Fe molar ratios on the phase transformationPhase transformation of roasted products. The diffusionDiffusion rate of Mg2+ at the reaction interface of the Fe3O4–MgO system under different atmosphere conditions is investigated. The results showed that the higher Mg/Fe ratio is favorable for generating MgxFe3–xO4, and the presence of Mg2+ will hinder the Fe2O3 grain connection. It is unfavorable to the Fe2O3 grain growth. At 1200 ℃, the diffusionDiffusion rate of Mg2+ at the interface of the Fe3O4–MgO system in a nitrogen atmosphere was faster than that in an air atmosphere.