Existing alumina extraction and material production methods result in the formation of harmful ammonia gas or ammonia water originating from aluminum nitride (AlN) in dross. Therefore, in this study, aluminum dross was used as a denitration reagent to eliminate nitrogen oxides in flue gas and AlN in dross. Based on the proposed scheme, thermodynamic calculations were performed to investigate the denitrification effect and reduction of aluminum dross in flue gas. The results show that equilibrium concentrations of NO, NO₂, and HF in the flue gas were influenced mainly by temperature; their concentrations increased with an increase in the temperature, reaching 4.4 × 10⁻²⁰, 1.7 × 10⁻³⁸, and 7.0 × 10⁻⁸ g/m³, respectively, at 923 K. The Gibbs free energy corresponding to the reaction of CO₂ with Al/AlN in aluminum dross was −377/–120 kJ/mol. HF, originating from the reaction of NaF and water vapor, maintained an extremely low concentration of 6.99 × 10⁻⁸ g/m³ at 923 K. These results indicate that aluminum dross processing may clean the flue gas and increase the calorific value while eliminating the hazards of AlN. The results obtained herein will provide theoretical guidance toward new avenues of aluminum dross utilization.

现有的氧化铝提取和材料生产方法导致在浮渣中形成源自氮化铝 (AlN) 的有害氨气或氨水。因此，本研究采用铝渣作为脱硝试剂，去除烟气中的氮氧化物和渣中的AlN。基于所提出的方案，进行了热力学计算，研究了烟气中铝渣的脱硝效果和减少量。结果表明，烟气中NO、NO ₂和HF的平衡浓度主要受温度影响；它们的浓度随着温度的升高而增加，分别达到 4.4 × 10 ^-20、1.7 × 10 ^-38和 7.0 × 10 ^-8  g/m ³，分别为 923 K。对应于 CO ₂与铝渣中的 Al/AlN反应的吉布斯自由能为 -377/–120 kJ/mol。NaF 与水蒸气反应产生的 HF在 923 K 时保持在 6.99 × 10 ^-8  g/m ^{3 的}极低浓度。这些结果表明铝渣处理可以清洁烟气并增加热值，同时消除氮化铝的危害。此处获得的结果将为铝渣利用的新途径提供理论指导。