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<p>Electric furnace arc dust (EAFD) serves as a significant secondary resource for zinc, lead, and iron. This study investigates the effects of basicity variations on the volatilization kinetics of lead, phase transformation, and microstructure evolution of the EAFD during the synchronous smelting reduction process. Thermodynamic analysis and experiments results show that volatilization behavior of lead was related to the phase transformation. Increasing the SiO<sub>2</sub> addition would lead to the formation of nonvolatile phase PbSiO<sub>3</sub>, and promote the generation of liquid phase that hinder gas diffusion. The kinetics of lead volatilization exhibit a two-stage behavior. In the first stage, the primary volatilization was PbO, with the rate-controlling step being the phase-boundary reaction. In the second stage, the primary volatilization was Pb, with the rate-controlling step being diffusion. Moreover, these findings have been successfully applied to industrial production, leading to a 40 pct reduction in the dust emission rate of lead-zinc mixed materials during the smelting process, thereby facilitating energy conservation and consumption reduction.</p>

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Effect of SiO2 Addition on Lead Volatilization Behavior from Electric Arc Furnace Dust by Smelting Reduction: Reaction Kinetics, Phase Transformation and Industrial Process

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Chen Li,
  • Wei Liu,
  • Fen Jiao,
  • Hongbin Ling,
  • Shiyang Liu

摘要

Electric furnace arc dust (EAFD) serves as a significant secondary resource for zinc, lead, and iron. This study investigates the effects of basicity variations on the volatilization kinetics of lead, phase transformation, and microstructure evolution of the EAFD during the synchronous smelting reduction process. Thermodynamic analysis and experiments results show that volatilization behavior of lead was related to the phase transformation. Increasing the SiO2 addition would lead to the formation of nonvolatile phase PbSiO3, and promote the generation of liquid phase that hinder gas diffusion. The kinetics of lead volatilization exhibit a two-stage behavior. In the first stage, the primary volatilization was PbO, with the rate-controlling step being the phase-boundary reaction. In the second stage, the primary volatilization was Pb, with the rate-controlling step being diffusion. Moreover, these findings have been successfully applied to industrial production, leading to a 40 pct reduction in the dust emission rate of lead-zinc mixed materials during the smelting process, thereby facilitating energy conservation and consumption reduction.