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<p>Secondary aluminum dross (SAD) typically contains significant amounts of AlN, which is a major source of the toxic gases released from SAD. Converting AlN into more stable aluminum compounds is crucial for the safe disposal and resource recovery of SAD. In this study, the oxidative removal of AlN from SAD was investigated, and an efficient denitrification method is proposed. Theoretical and experimental results demonstrate that AlN oxidation forms a dense, ordered [Al–O] oxide layer on its surface, which hinders further oxidation. NaF, AlF<sub>3</sub>, and Na<sub>3</sub>AlF<sub>6</sub> were found to enhance SAD denitrification, and binary fluoride additives KF–Na<sub>3</sub>AlF<sub>6</sub> provided further improvement. Roasting SAD at 800&#xa0;°C for 60&#xa0;min with 12 wt% KF–Na<sub>3</sub>AlF<sub>6</sub> (6 wt% Na<sub>3</sub>AlF<sub>6</sub> + 6 wt% KF) achieved 93% oxidation of AlN. The treated SAD showed low reactivity and released negligible gas in aqueous solution. The promoting effect of Na<sub>3</sub>AlF<sub>6</sub>-based additives is attributed to their ability to facilitate the transformation of the dense, well-ordered [Al–O] surface layer into β-alumina.</p>

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Efficient removal of AlN from secondary aluminum dross using binary fluoride: a theoretical and experimental study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月10日

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  • Tianshuang Li,
  • Zhaohui Guo,
  • Hong Qin,
  • Huimin Xie

摘要

Secondary aluminum dross (SAD) typically contains significant amounts of AlN, which is a major source of the toxic gases released from SAD. Converting AlN into more stable aluminum compounds is crucial for the safe disposal and resource recovery of SAD. In this study, the oxidative removal of AlN from SAD was investigated, and an efficient denitrification method is proposed. Theoretical and experimental results demonstrate that AlN oxidation forms a dense, ordered [Al–O] oxide layer on its surface, which hinders further oxidation. NaF, AlF3, and Na3AlF6 were found to enhance SAD denitrification, and binary fluoride additives KF–Na3AlF6 provided further improvement. Roasting SAD at 800 °C for 60 min with 12 wt% KF–Na3AlF6 (6 wt% Na3AlF6 + 6 wt% KF) achieved 93% oxidation of AlN. The treated SAD showed low reactivity and released negligible gas in aqueous solution. The promoting effect of Na3AlF6-based additives is attributed to their ability to facilitate the transformation of the dense, well-ordered [Al–O] surface layer into β-alumina.