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<p>The spent lead paste (SLP) serves as a crucial secondary resource for the lead industry in striving towards sustainable development. The conventional pyrometallurgical recovery process for the SLP currently necessitates temperatures exceeding 1000&#xa0;°C, resulting in significant generation of lead dust and sulfur oxides. A more environmentally friendly approach is proposed, involving the utilization of biomass as the reductant for the reduction roasting of SLP.&#xa0;By harnessing the abundant reducing gases produced through biomass pyrolysis, the process can efficiently reduce various lead species, such as lead sulfate (PbSO<sub>4</sub>) and lead dioxide (PbO<sub>2</sub>), in a single step to transform to lead sulfide (PbS), lead oxide (PbO), and metallic lead (Pb). Under optimized conditions, the reduction rates of PbSO<sub>4</sub> and PbO<sub>2</sub> in SLP reached as high as 97.77% and 96.55%, respectively. The production of crude lead using reduced products requires far less energy than SLP. This innovative biomass-based reduction process not only lowers the reduction temperature to 800&#xa0;°C, thereby reducing energy consumption significantly, but also offers the advantage of carbon neutralization.</p> Graphical Abstract <p></p>

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A Novel Eco-Friendly Method for Disposal of Spent Lead Paste by Reduction Roasting with Biomass

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Feng Xie,
  • Hui Ge,
  • Wei Wang,
  • Yunlong Bai,
  • Zhenqi Wang

摘要

The spent lead paste (SLP) serves as a crucial secondary resource for the lead industry in striving towards sustainable development. The conventional pyrometallurgical recovery process for the SLP currently necessitates temperatures exceeding 1000 °C, resulting in significant generation of lead dust and sulfur oxides. A more environmentally friendly approach is proposed, involving the utilization of biomass as the reductant for the reduction roasting of SLP. By harnessing the abundant reducing gases produced through biomass pyrolysis, the process can efficiently reduce various lead species, such as lead sulfate (PbSO4) and lead dioxide (PbO2), in a single step to transform to lead sulfide (PbS), lead oxide (PbO), and metallic lead (Pb). Under optimized conditions, the reduction rates of PbSO4 and PbO2 in SLP reached as high as 97.77% and 96.55%, respectively. The production of crude lead using reduced products requires far less energy than SLP. This innovative biomass-based reduction process not only lowers the reduction temperature to 800 °C, thereby reducing energy consumption significantly, but also offers the advantage of carbon neutralization.

Graphical Abstract