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In this paper, the reduction behavior of carbon composite briquetteCarbon composite briquette (CCB) under CO–CO2–N2 atmosphereCO-CO-N atmosphere with H2 mixing was investigated. The CCB employed in this research had a composition of 24.27 wt.% Fe3O4, 48.21 wt.% FeO, 0.42 wt.% Fe, and 17.33 wt.% carbonCarbon. Nonisothermal reduction test of CCB under an introducing 10% H2–32%CO–8%CO2–50%N2 gas mixture and a heating rate of 6 K/min was carried out using a thermogravimetric setup. The obtained mass-loss curve of CCB was analyzed using a mathematical model to understand its reduction progress. Microstructures of the samples obtained at different temperatures were analyzed. Results showed that under the specific gas–solid interface area of iron-oxide particles in CCB was 100 m2·m−3, the model predictions and the experimental measurements were in good agreement. The CCB presented a uniform reduction rate, and carbonCarbon gasificationGasification was negligible before 1073 K, and presented an increasing gasificationGasification rate after 1073 K. In the temperature range from 1173 to 1273 K, fayalite was formed, facilitating the agglomeration of the iron particles in the CCB.

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Reduction of Carbon Iron-Ore Composite Briquette Under CO-CO2-N2 Atmosphere with H2 Mixing

  • 会议论文

  • 发表日期：

    2026年

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  • Haoting Ma,
  • Zhongyuan Song,
  • Huiqing Tang

摘要

In this paper, the reduction behavior of carbon composite briquetteCarbon composite briquette (CCB) under CO–CO2–N2 atmosphereCO-CO-N atmosphere with H2 mixing was investigated. The CCB employed in this research had a composition of 24.27 wt.% Fe3O4, 48.21 wt.% FeO, 0.42 wt.% Fe, and 17.33 wt.% carbonCarbon. Nonisothermal reduction test of CCB under an introducing 10% H2–32%CO–8%CO2–50%N2 gas mixture and a heating rate of 6 K/min was carried out using a thermogravimetric setup. The obtained mass-loss curve of CCB was analyzed using a mathematical model to understand its reduction progress. Microstructures of the samples obtained at different temperatures were analyzed. Results showed that under the specific gas–solid interface area of iron-oxide particles in CCB was 100 m2·m−3, the model predictions and the experimental measurements were in good agreement. The CCB presented a uniform reduction rate, and carbonCarbon gasificationGasification was negligible before 1073 K, and presented an increasing gasificationGasification rate after 1073 K. In the temperature range from 1173 to 1273 K, fayalite was formed, facilitating the agglomeration of the iron particles in the CCB.