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<p>The rotary hearth furnace (RHF) coal-based direct reduction ironmaking process is extensively used for treating iron-containing metallurgical dust in the steel industry and represents a key trend in the future development of dust treatment technologies. The study investigates the influence of various factors, including the type and particle size of biochar, as well as the C/O ratio, on the drop strength and cold compressive strength of the briquettes. The results indicate that, due to the fibrous structure and low fixed carbon content of rice straw biochar, the strength of rice straw biochar briquettes is higher compared to those made from jujun grass and eucalyptus biochar. As the particle size of biochar increases, the strength of biochar briquettes gradually decreases. The optimal particle size distribution of biochar is found to be &lt; 0.15&#xa0;mm, with compressive strength of 90 N, 100 N, and 116 N, respectively. In addition, as the C/O ratio increases, the strength of the biochar briquettes gradually declines, and when C/O = 0.4, the compressive strength is recorded as 80 N, 120 N, and 126 N, respectively. The experimental results demonstrate that the cold strength of the biochar and metallurgical dust composite briquettes can meet the production requirements.</p> Graphical Abstract <p></p>

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Effect of Biochar Addition on the Strength Properties of Metallurgical Dust Briquettes

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Yongsheng Yang,
  • Runsheng Xu,
  • Jianliang Zhang,
  • Wei Wang,
  • Rongrong Wang,
  • Jinpeng Shi,
  • Yingpeng Dong,
  • Yuancheng Huang,
  • Yanfei Ye

摘要

The rotary hearth furnace (RHF) coal-based direct reduction ironmaking process is extensively used for treating iron-containing metallurgical dust in the steel industry and represents a key trend in the future development of dust treatment technologies. The study investigates the influence of various factors, including the type and particle size of biochar, as well as the C/O ratio, on the drop strength and cold compressive strength of the briquettes. The results indicate that, due to the fibrous structure and low fixed carbon content of rice straw biochar, the strength of rice straw biochar briquettes is higher compared to those made from jujun grass and eucalyptus biochar. As the particle size of biochar increases, the strength of biochar briquettes gradually decreases. The optimal particle size distribution of biochar is found to be < 0.15 mm, with compressive strength of 90 N, 100 N, and 116 N, respectively. In addition, as the C/O ratio increases, the strength of the biochar briquettes gradually declines, and when C/O = 0.4, the compressive strength is recorded as 80 N, 120 N, and 126 N, respectively. The experimental results demonstrate that the cold strength of the biochar and metallurgical dust composite briquettes can meet the production requirements.

Graphical Abstract