The reduction kineticsKinetics of high phosphorus iron ore pellets in the H2-N2 atmosphere were experimentally investigated. The results show that increasing temperature increased the reduction rate of the pellet in the early stage and the pellet can reach a reduction fraction of more than 0.98% in the temperature range from 1073 to 1273 K. When the hydrogenHydrogen concentration is less than 75% in the atmosphere, the influence of the atmosphere on pellet reduction is significant. In the reduction, the activation energyActivation energy increases as the reduction fraction increases. The range of the activation energyActivation energy is from 20.70 kJ/mol to 37.18 kJ/mol. The reduction of high-phosphorus iron ore pelletsHigh-phosphorus iron ore pellet is initially controlled by internal gas diffusion, and in the later stage, it is controlled by a combination of internal gas diffusion and interfacial chemical reactions.

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Reduction Kinetics of High-Phosphorus Iron Ore Pellet Under Hydrogen Atmosphere

  • Yan Liu,
  • Jian Yao,
  • Huiqing Tang

摘要

The reduction kineticsKinetics of high phosphorus iron ore pellets in the H2-N2 atmosphere were experimentally investigated. The results show that increasing temperature increased the reduction rate of the pellet in the early stage and the pellet can reach a reduction fraction of more than 0.98% in the temperature range from 1073 to 1273 K. When the hydrogenHydrogen concentration is less than 75% in the atmosphere, the influence of the atmosphere on pellet reduction is significant. In the reduction, the activation energyActivation energy increases as the reduction fraction increases. The range of the activation energyActivation energy is from 20.70 kJ/mol to 37.18 kJ/mol. The reduction of high-phosphorus iron ore pelletsHigh-phosphorus iron ore pellet is initially controlled by internal gas diffusion, and in the later stage, it is controlled by a combination of internal gas diffusion and interfacial chemical reactions.