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<p>Aluminum dross (AD) is a solid waste containing Al<sub>2</sub>O<sub>3</sub> from aluminum recycling. Leaching of aluminum to make <i>γ</i>-Al<sub>2</sub>O<sub>3</sub> powder is a promising method for recycling AD. However, the aluminum is hard to be leached out due to the high chemical resistance of Al<sub>2</sub>O<sub>3</sub>. In this work, a calcination treatment with CaO was applied on AD to reconstruct the Al<sub>2</sub>O<sub>3</sub> into calcium aluminate, which possessed a high chemical reactivity. Reconstruction reaction was consisted of the following steps. The CaO was dissociated into Ca<sup>2+</sup>, which was absorbed on the surface of the Al<sub>2</sub>O<sub>3</sub> unit cell with hexagonal close packing structure. The absorbed Ca<sup>2+</sup> penetrated and reconstructed the unit cell, followed by synthetizing the calcium aluminate. Leaching experiment was conducted on the AD and calcined AD. Apparent activation energy of the leaching reaction was decreased from 27.3&#xa0;kJ/mol to 23.9&#xa0;kJ/mol after calcination, and leaching rate of aluminum was increased from 72.2% to 85.8%, with NaOH concentration of 200&#xa0;g/L, liquid–solid ratio of 12&#xa0;mL/g, and 100°C for 4&#xa0;h.</p>

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Enhanced Leaching of Aluminum in Aluminum Dross After Reconstructing Al2O3 into Calcium Aluminate by Calcination with CaO

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Hanlin Shen,
  • Jun Liu,
  • Dongjie Luo,
  • Junjie Zhang,
  • Xiaoyan Zhang,
  • Bo Liu

摘要

Aluminum dross (AD) is a solid waste containing Al2O3 from aluminum recycling. Leaching of aluminum to make γ-Al2O3 powder is a promising method for recycling AD. However, the aluminum is hard to be leached out due to the high chemical resistance of Al2O3. In this work, a calcination treatment with CaO was applied on AD to reconstruct the Al2O3 into calcium aluminate, which possessed a high chemical reactivity. Reconstruction reaction was consisted of the following steps. The CaO was dissociated into Ca2+, which was absorbed on the surface of the Al2O3 unit cell with hexagonal close packing structure. The absorbed Ca2+ penetrated and reconstructed the unit cell, followed by synthetizing the calcium aluminate. Leaching experiment was conducted on the AD and calcined AD. Apparent activation energy of the leaching reaction was decreased from 27.3 kJ/mol to 23.9 kJ/mol after calcination, and leaching rate of aluminum was increased from 72.2% to 85.8%, with NaOH concentration of 200 g/L, liquid–solid ratio of 12 mL/g, and 100°C for 4 h.