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<p>Selenium distillation slag (SDS) is a high-value-added secondary resource with a high recovery value. This paper aims to investigate the leaching behavior and kinetics of selenium, tellurium, and copper in the SDS acid oxidation leaching process with H<sub>2</sub>SO<sub>4</sub> and H<sub>2</sub>O<sub>2</sub>. The experimental results showed that under the optimum conditions, the contents of selenium, tellurium, and copper in the SDS were reduced from 22.13 wt%, 3.58 wt%, and 6.42 wt% to 3.06 wt%, 0.27 wt%, and 0.33 wt%, respectively. Correspondingly, the recovery rates are 87.08%, 97.15% and 99.7%. The leaching processes of selenium and tellurium were controlled by diffusion and chemical reactions, and the leaching behavior of copper was controlled by chemical reactions. Below 45 °C, the activation energies for selenium, tellurium, and copper were found to be 26.47, 62.18 and 19.67 kJ/mol, respectively. In addition, the contents of lead, silver and gold in the leaching residue are increased to 46.8 wt%, 8.35 wt% and 0.27 wt%, respectively. These substances can be utilized as raw materials for the recovery of these valuable metals. Importantly, the entire process does not generate toxic or harmful waste, making it a green and environmentally friendly method for resource recovery.</p>

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Oxidative leaching mechanism and kinetics of Se, Te and Cu for selenium distillation slag by H2SO4 and H2O2

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Lang Liu,
  • Tian-tian Zhen,
  • Feng-kang Wang,
  • Huan Luo,
  • Ji-lin He,
  • Teng-teng Shi,
  • Xian-jun Lei,
  • Guo-zheng Zha,
  • Wen-long Jiang,
  • Bin Yang,
  • Bao-qiang Xu

摘要

Selenium distillation slag (SDS) is a high-value-added secondary resource with a high recovery value. This paper aims to investigate the leaching behavior and kinetics of selenium, tellurium, and copper in the SDS acid oxidation leaching process with H2SO4 and H2O2. The experimental results showed that under the optimum conditions, the contents of selenium, tellurium, and copper in the SDS were reduced from 22.13 wt%, 3.58 wt%, and 6.42 wt% to 3.06 wt%, 0.27 wt%, and 0.33 wt%, respectively. Correspondingly, the recovery rates are 87.08%, 97.15% and 99.7%. The leaching processes of selenium and tellurium were controlled by diffusion and chemical reactions, and the leaching behavior of copper was controlled by chemical reactions. Below 45 °C, the activation energies for selenium, tellurium, and copper were found to be 26.47, 62.18 and 19.67 kJ/mol, respectively. In addition, the contents of lead, silver and gold in the leaching residue are increased to 46.8 wt%, 8.35 wt% and 0.27 wt%, respectively. These substances can be utilized as raw materials for the recovery of these valuable metals. Importantly, the entire process does not generate toxic or harmful waste, making it a green and environmentally friendly method for resource recovery.