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<p>The conventional lime neutralization process generates a large volume of lime neutralization sludge (LNS). This LNS, containing large amounts of valuable metals such as zinc, lead, and copper, and toxic substances such as arsenic, cadmium, and chromium, as well as a large amount of moisture, needs to be further processed for resource recycling and preventing environmental pollution. In this study, the technique involving low-temperature roasting, acid leaching, and extraction (RL&amp;E) was employed to realize the recovery of zinc from the LNS produced in the zinc smelting process. The effects of various parameters such as the temperature, concentration, and time on the roasting, leaching, and extraction processes were investigated. After roasting at 280°C, when the leaching temperature was 70°C, the sulfuric acid concentration was 30%, the solid–liquid ratio was 1:5 (kg/L), and the leaching duration was 2&#xa0;h, the zinc-leaching rate reached 94.5%. Thereafter, when three-stage extraction was performed with the extractant bis(2-ethylhexyl)phosphate concentration being 25%, the pH value of the leaching solution being 2, the extraction time being 8&#xa0;min, and the extraction phase ratio being 2 (v/v), the zinc-extraction rate reached 82%.</p><p>The results of the toxicity characteristic leaching procedure (TCLP) revealed that the stabilization and removal of toxic substances occurred during the sulfuric acid leaching. The results of this study reveal that the leaching sludge (LS) obtained after Zn extraction via the RL&amp;E process complies with the requirements for gypsum used as a building material, thus enabling the achievement of zero waste production.</p> Graphical Abstract <p></p>

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Realization of Zero Waste Production and Recovery of Zinc as Zinc Sulfate from Lime Neutralization Sludge Produced During Zinc Smelting

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Ruibing Li,
  • Youcheng Yue,
  • Yanhui Liang,
  • Ni Yang,
  • Sansan Yu,
  • Ting-an Zhang

摘要

The conventional lime neutralization process generates a large volume of lime neutralization sludge (LNS). This LNS, containing large amounts of valuable metals such as zinc, lead, and copper, and toxic substances such as arsenic, cadmium, and chromium, as well as a large amount of moisture, needs to be further processed for resource recycling and preventing environmental pollution. In this study, the technique involving low-temperature roasting, acid leaching, and extraction (RL&E) was employed to realize the recovery of zinc from the LNS produced in the zinc smelting process. The effects of various parameters such as the temperature, concentration, and time on the roasting, leaching, and extraction processes were investigated. After roasting at 280°C, when the leaching temperature was 70°C, the sulfuric acid concentration was 30%, the solid–liquid ratio was 1:5 (kg/L), and the leaching duration was 2 h, the zinc-leaching rate reached 94.5%. Thereafter, when three-stage extraction was performed with the extractant bis(2-ethylhexyl)phosphate concentration being 25%, the pH value of the leaching solution being 2, the extraction time being 8 min, and the extraction phase ratio being 2 (v/v), the zinc-extraction rate reached 82%.

The results of the toxicity characteristic leaching procedure (TCLP) revealed that the stabilization and removal of toxic substances occurred during the sulfuric acid leaching. The results of this study reveal that the leaching sludge (LS) obtained after Zn extraction via the RL&E process complies with the requirements for gypsum used as a building material, thus enabling the achievement of zero waste production.

Graphical Abstract