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<p>Traditional methods for extracting lead (Pb) from zinc plant residue (ZPR) typically involve leaching with highly concentrated sodium hydroxide (NaOH) solutions, which pose challenges related to material handling and safety. In this study, a process based on two-stage leaching using low-concentration of NaOH to recover Pb from Pb-rich ZPR was proposed. This approach not only aims to maximize Pb recovery but also enriches other valuable metals, such as silver (Ag), copper (Cu), iron (Fe), and aluminum (Al) in the solid residue. The effect of leaching parameters, such as NaOH concentration, time, temperature, and pulp density was investigated and optimized. Utilizing 2.0&#xa0;M NaOH in the first- and 3.0&#xa0;M in the second-stage leaching, at 25&#xa0;°C temperature, 30&#xa0;min leaching time, and 100&#xa0;g/L pulp density, over 97% of Pb and 61% of Zn were recovered. The leach solutions were mixed and used for cementation using Zn powder. The results show that quantitative Pb cementation was achieved under the conditions: 25&#xa0;°C, Zn: Pb mole ratio of 1.2:1.0, and 30&#xa0;min of cementation time. The final residue after the two-stage leaching exhibited an enrichment of more than threefold of Ag, Cu, Zn, Fe, and Al, which can subsequently be treated for the metal recovery. The solution obtained after cementation is enriched in Zn, which can be utilized for Zn recovery. The results from the study indicate that a comprehensive and circular metal recovery process from ZPR can be realized by a two-stage alkali (NaOH) leaching-cementation method.</p> Graphical Abstract <p></p>

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Comprehensive Recovery of Lead (Pb) from Pb-Rich Zinc Plant Residue (ZPR) via Alkaline Leaching Followed by Cementation

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Kurniawan Kurniawan,
  • Tam Nguyen Thi,
  • Sujeong Lee,
  • Mooki Bae,
  • Jae-chun Lee,
  • Kyoungkeun Yoo

摘要

Traditional methods for extracting lead (Pb) from zinc plant residue (ZPR) typically involve leaching with highly concentrated sodium hydroxide (NaOH) solutions, which pose challenges related to material handling and safety. In this study, a process based on two-stage leaching using low-concentration of NaOH to recover Pb from Pb-rich ZPR was proposed. This approach not only aims to maximize Pb recovery but also enriches other valuable metals, such as silver (Ag), copper (Cu), iron (Fe), and aluminum (Al) in the solid residue. The effect of leaching parameters, such as NaOH concentration, time, temperature, and pulp density was investigated and optimized. Utilizing 2.0 M NaOH in the first- and 3.0 M in the second-stage leaching, at 25 °C temperature, 30 min leaching time, and 100 g/L pulp density, over 97% of Pb and 61% of Zn were recovered. The leach solutions were mixed and used for cementation using Zn powder. The results show that quantitative Pb cementation was achieved under the conditions: 25 °C, Zn: Pb mole ratio of 1.2:1.0, and 30 min of cementation time. The final residue after the two-stage leaching exhibited an enrichment of more than threefold of Ag, Cu, Zn, Fe, and Al, which can subsequently be treated for the metal recovery. The solution obtained after cementation is enriched in Zn, which can be utilized for Zn recovery. The results from the study indicate that a comprehensive and circular metal recovery process from ZPR can be realized by a two-stage alkali (NaOH) leaching-cementation method.

Graphical Abstract