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Zinc-containing dust, a significantMicrowave byproduct of the steel industry, has attracted increasing research attention due to growing environmental concerns and the implementation of stricter ecological policies. Guided by the “dual-carbon” strategy, this study proposed a novel approach utilizing biochar and bio-syngas for the treatment of basic oxygen furnace (BOF) dust and blast furnace (BF) dust. The effects of the C/O molar ratio on the iron metallization, zinc removal and iron particle growth were systematically investigated. The results demonstrate that as the C/O molar ratio increased, the iron metallization degree rose from 89.82% to 93.81% and the zinc volatilization percentage improved from 97.90% to 99.70%. Meanwhile, the average iron particle size increased from 5.46 μm to 11.63 μm. At the optimal C/O molar ratio of 1.0, the iron metallization degree, zinc volatilization percentage, and iron particle size reached 93.76%, 99.70%, and 10.61 μm, respectively.

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Preparation of Direct Reduced Iron from Basic Oxygen Furnace Dust and Blast Furnace Dust by Microwave-Carbon-Hydrogen Coupled Reduction

  • 会议论文

  • 发表日期：

    2026年

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  • Lin Xiong,
  • Zhiwei Peng,
  • Shaochang Nie,
  • Tianle Yin

摘要

Zinc-containing dust, a significantMicrowave byproduct of the steel industry, has attracted increasing research attention due to growing environmental concerns and the implementation of stricter ecological policies. Guided by the “dual-carbon” strategy, this study proposed a novel approach utilizing biochar and bio-syngas for the treatment of basic oxygen furnace (BOF) dust and blast furnace (BF) dust. The effects of the C/O molar ratio on the iron metallization, zinc removal and iron particle growth were systematically investigated. The results demonstrate that as the C/O molar ratio increased, the iron metallization degree rose from 89.82% to 93.81% and the zinc volatilization percentage improved from 97.90% to 99.70%. Meanwhile, the average iron particle size increased from 5.46 μm to 11.63 μm. At the optimal C/O molar ratio of 1.0, the iron metallization degree, zinc volatilization percentage, and iron particle size reached 93.76%, 99.70%, and 10.61 μm, respectively.