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<p>Secondary aluminum dross (SAD), a hazardous byproduct of aluminum smelting, contains reactive aluminum nitride (AlN). This study systematically investigates the thermodynamics and kinetics of AlN hydrolysis in SAD. Thermodynamic calculations demonstrate that both the Gibbs free energy and enthalpy of hydrolysis decrease with increasing temperature (0–100°C), confirming the reaction's spontaneous and exothermic nature. Kinetic analysis reveals a low activation energy (10.77&#xa0;kJ/mol), suggesting a diffusion-controlled mechanism where H<sub>2</sub>O molecules penetrate through the Al(OH)<sub>3</sub> product layer to react with AlN. Experimental results show that optimal hydrolysis conditions (90°C, 3&#xa0;h, liquid-to-solid ratio of 5&#xa0;ml&#xa0;g<sup>−1</sup>) achieve 87.67% AlN conversion, yielding 2064.2&#xa0;ml ammonia gas and 1.0&#xa0;g crystallized salts. The findings elucidate the diffusion kinetics governing AlN hydrolysis in SAD.</p>

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Diffusion of H2O in Aluminum Hydroxide Covered on Aluminum Nitride During Hydrolysis of Secondary Aluminum Dross

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Jun Liu,
  • Shengen Zhang,
  • Hanlin Shen,
  • Bingjie Lou,
  • Bo Liu,
  • Bolin Zhang

摘要

Secondary aluminum dross (SAD), a hazardous byproduct of aluminum smelting, contains reactive aluminum nitride (AlN). This study systematically investigates the thermodynamics and kinetics of AlN hydrolysis in SAD. Thermodynamic calculations demonstrate that both the Gibbs free energy and enthalpy of hydrolysis decrease with increasing temperature (0–100°C), confirming the reaction's spontaneous and exothermic nature. Kinetic analysis reveals a low activation energy (10.77 kJ/mol), suggesting a diffusion-controlled mechanism where H2O molecules penetrate through the Al(OH)3 product layer to react with AlN. Experimental results show that optimal hydrolysis conditions (90°C, 3 h, liquid-to-solid ratio of 5 ml g−1) achieve 87.67% AlN conversion, yielding 2064.2 ml ammonia gas and 1.0 g crystallized salts. The findings elucidate the diffusion kinetics governing AlN hydrolysis in SAD.