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<p>The use of self-reducing agglomerates as ferrous materials can decrease fuel consumption and enhance blast furnace productivity. In this study, the effect of the atmosphere on the reduction performance of iron ore–petcoke self-reducing briquettes was investigated. The briquettes were produced in a pilot plant under a pressure of 15&#xa0;MPa, followed by curing at 200&#xa0;°C for 120&#xa0;min. After the high-temperature experiments, the briquettes were chemically characterized, optical microscopy and mercury porosimetry. Optical microscopy revealed a uniform distribution of reduced iron oxides (not a shrinking core model) and retained carbon. Although petcoke does not directly participate in the reduction reaction, interrupted tests at various temperatures showed that it improved pore distribution and promoted more effective reduction at higher temperatures. The blast furnace operation diagram showed that by incorporating 10% SRB into the ferrous burden, the coke rate can be decreased by 10&#xa0;kg/t<sub>HM</sub> due to improved gas utilization and lower energy requirements. This adjustment could decrease CO<sub>2</sub> emissions by 14&#xa0;kg/t<sub>HM</sub>.</p> Graphical Abstract <p></p>

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Atmosphere Effect on the Reducing Behavior of iron ore–petcoke Briquettes

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Beatriz Fausta Gandra,
  • Arthur Felipe Lino Oliveira,
  • Maurício Covcevich Bagatini,
  • Eduardo Osório

摘要

The use of self-reducing agglomerates as ferrous materials can decrease fuel consumption and enhance blast furnace productivity. In this study, the effect of the atmosphere on the reduction performance of iron ore–petcoke self-reducing briquettes was investigated. The briquettes were produced in a pilot plant under a pressure of 15 MPa, followed by curing at 200 °C for 120 min. After the high-temperature experiments, the briquettes were chemically characterized, optical microscopy and mercury porosimetry. Optical microscopy revealed a uniform distribution of reduced iron oxides (not a shrinking core model) and retained carbon. Although petcoke does not directly participate in the reduction reaction, interrupted tests at various temperatures showed that it improved pore distribution and promoted more effective reduction at higher temperatures. The blast furnace operation diagram showed that by incorporating 10% SRB into the ferrous burden, the coke rate can be decreased by 10 kg/tHM due to improved gas utilization and lower energy requirements. This adjustment could decrease CO2 emissions by 14 kg/tHM.

Graphical Abstract