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<p>Rotary hearth furnace direct reduction is one of the effective processes for treating zinc-bearing dust (ZBD). In this study, a novel process for direct reduction of ZBD and reduced pellet screening in a rotary hearth furnace through cold briquetting was reported, and investigated the direct reduction mechanism of ZBD. The direct reduction study indicates that the metallicized pellets can be prepared with a compressive strength of 1245 N, an iron grade of 70.12%, a metallization rate of 96.90%, and a zinc removal rate of 98.53% under a temperature of 1275&#xa0;°C, a duration of 30&#xa0;min, a reducing agent dosage of 5%. In addition, the metallization degree, iron grade, and dezincification rate did not change significantly with the addition of 10% reduced pellet screening under the optimum conditions described above, and the reduced pellet strength was increased by 264 N.</p> Graphical Abstract <p></p>

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Synchronously Utilizing Zinc-Bearing Dust and Reduced Pellet Screening by Direct Reduction

  • 期刊论文

  • 发表日期：

    2025年8月9日

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  • Zhengqi Guo,
  • Xing Chen,
  • Deqing Zhu,
  • Jian Pan,
  • Siwei Li,
  • Fukang Zhao,
  • Congcong Yang

摘要

Rotary hearth furnace direct reduction is one of the effective processes for treating zinc-bearing dust (ZBD). In this study, a novel process for direct reduction of ZBD and reduced pellet screening in a rotary hearth furnace through cold briquetting was reported, and investigated the direct reduction mechanism of ZBD. The direct reduction study indicates that the metallicized pellets can be prepared with a compressive strength of 1245 N, an iron grade of 70.12%, a metallization rate of 96.90%, and a zinc removal rate of 98.53% under a temperature of 1275 °C, a duration of 30 min, a reducing agent dosage of 5%. In addition, the metallization degree, iron grade, and dezincification rate did not change significantly with the addition of 10% reduced pellet screening under the optimum conditions described above, and the reduced pellet strength was increased by 264 N.

Graphical Abstract