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<p>A comparative study was conducted on the kinetics of coal- and gas-based magnetization roasting processes and the reduction–separation behavior for an oolitic hematite ore. The magnetization reduction rate of roasted ore reached 46.86% when roasting for 45&#xa0;min under 750&#xa0;°C with coal-to-ore ratio of 8% for coal-based system, an optimized concentrate with iron grade and recovery rate of 61.51% and 91.43% could be obtained; for gas-based system, the magnetization rate was 44.34%, and the iron grade and recovery rate reached 58.09% and 94.30% under the optimized roasting temperature of 650&#xa0;°C for 60&#xa0;min with CO proportion of 30%. Microscopic morphology analyses indicated that the transformation process for both systems was in accordance with the unreacted-core shrinking model. Artificial magnetite was generated layer-by-layer, and the inside oolitic cores were difficult to fully magnetize. Kinetic studies showed that the magnetization reduction process mainly fitted the internal-diffusion-control and chemical-reaction-control model, respectively, for coal- and gas-based systems, with activation energy of 127.80 and 36.68&#xa0;kJ/mol, indicating that the gas-based system was significantly lower than that of the coal-based system.</p>

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Comparative study of magnetic reduction–separation behavior and kinetics of refractory oolitic iron ore through coal-based versus gas-based reductive roasting

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Ming-Xia Liu,
  • Hui-Min Zhang,
  • Tie-Jun Chen,
  • Han-Quan Zhang,
  • Fan Yang,
  • Zhao-Hui Yao,
  • Man-Man Lu

摘要

A comparative study was conducted on the kinetics of coal- and gas-based magnetization roasting processes and the reduction–separation behavior for an oolitic hematite ore. The magnetization reduction rate of roasted ore reached 46.86% when roasting for 45 min under 750 °C with coal-to-ore ratio of 8% for coal-based system, an optimized concentrate with iron grade and recovery rate of 61.51% and 91.43% could be obtained; for gas-based system, the magnetization rate was 44.34%, and the iron grade and recovery rate reached 58.09% and 94.30% under the optimized roasting temperature of 650 °C for 60 min with CO proportion of 30%. Microscopic morphology analyses indicated that the transformation process for both systems was in accordance with the unreacted-core shrinking model. Artificial magnetite was generated layer-by-layer, and the inside oolitic cores were difficult to fully magnetize. Kinetic studies showed that the magnetization reduction process mainly fitted the internal-diffusion-control and chemical-reaction-control model, respectively, for coal- and gas-based systems, with activation energy of 127.80 and 36.68 kJ/mol, indicating that the gas-based system was significantly lower than that of the coal-based system.