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<p>With increasingly stringent environmental regulations in the aluminum electrolysis industry, the utilization of waste barrier materials, such as lithium, has become essential. This study elucidates the leaching behavior and kinetics of lithium, aluminum, sodium, and silicon with phosphoric acid, emphasizing the effect of acid concentration, temperature, reaction time, and solid-to-liquid ratio. Notably, optimal conditions—0.9&#xa0;mol/L phosphoric acid, a 20:1&#xa0;mL/g liquid-to-solid ratio, 90°C, and 1.5&#xa0;h—yielded leaching efficiencies of 90.9% for lithium, 70.9% for aluminum, 37.2% for sodium, and 8.5% for silicon. Kinetic modeling demonstrated that lithium leaching was governed by chemical reaction control, while the leaching of aluminum was governed by a combination of diffusion and chemical reaction, with activation energies of 48.55 and 22.81&#xa0;kJ/mol, respectively. Therefore, these findings present a viable method for recovering valuable elements from industrial waste, contributing to the circular economy in aluminum production.</p>

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Leaching Mechanism and Kinetics of Waste Barrier Materials with Phosphoric Acid

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Saiya Li,
  • Weiping Liu,
  • Jun Yan,
  • Qiuyan Bi,
  • Junfeng Cheng,
  • Yujie Zhao,
  • Yuting Chen,
  • Guangrui Yan,
  • Guolin Zhang,
  • Wei Sun,
  • Shafiq Alam

摘要

With increasingly stringent environmental regulations in the aluminum electrolysis industry, the utilization of waste barrier materials, such as lithium, has become essential. This study elucidates the leaching behavior and kinetics of lithium, aluminum, sodium, and silicon with phosphoric acid, emphasizing the effect of acid concentration, temperature, reaction time, and solid-to-liquid ratio. Notably, optimal conditions—0.9 mol/L phosphoric acid, a 20:1 mL/g liquid-to-solid ratio, 90°C, and 1.5 h—yielded leaching efficiencies of 90.9% for lithium, 70.9% for aluminum, 37.2% for sodium, and 8.5% for silicon. Kinetic modeling demonstrated that lithium leaching was governed by chemical reaction control, while the leaching of aluminum was governed by a combination of diffusion and chemical reaction, with activation energies of 48.55 and 22.81 kJ/mol, respectively. Therefore, these findings present a viable method for recovering valuable elements from industrial waste, contributing to the circular economy in aluminum production.