A new process of AlN removal from secondary aluminum dross (SAD) by pyrometallurgical treatment with added cryolite was applied for solving the problem of recycling the secondary aluminum dross. The response surface methodology (RSM) was used to design experiments and optimize parameters. The results show that adding the appropriate amount of cryolite can effectively promote the oxidation of AlN in the SAD, and too much cryolite will reduce the promotion effect. The effects of roasting temperature and cryolite on the denitrification rate are the most significant (p < 0.0001) followed by holding time. Predicted values of the denitrification rate are found to be in good agreement with experimental values (R² = 0.9894 and \(R_{\text{adj}}^2=0.9775\), which confirms the validity of the model employed. The optimum conditions of roasting temperature of 750 °C, holding time of 194 min, mass fraction of cryolite of 17.7% are obtained according to the quadratic model. Under these conditions, the maximum actual denitrification rate reaches 94.71% and the AlN content in the SAD is only 0.55 wt%. The unfired brick with compressive strength of 18.62 MPa (GB/T 2542-2012) was prepared based on the roasted SAD.

为解决二次铝渣的回收利用问题，提出了一种通过添加冰晶石进行火法冶金去除二次铝渣（SAD）中的AlN的新工艺。响应面方法（RSM）用于设计实验和优化参数。结果表明，添加适量的冰晶石可以有效地促进SAD中AlN的氧化，而过多的冰晶石则会降低其促进效果。焙烧温度和冰晶石对反硝化速率的影响最为显着（p <0.0001），其次是保持时间。发现反硝化率的预测值与实验值非常吻合（R ² = 0.9894和\（R _ {\ text {adj}} ^ 2 = 0.9775 \），这确认了所用模型的有效性。根据二次模型，得到了焙烧温度为750°C，保温时间为194 min，冰晶石质量分数为17.7％的最佳条件。在这些条件下，最大实际反硝化率达到94.71％，SAD中的AlN含量仅为0.55 wt％。基于焙烧的SAD，制备了抗压强度为18.62 MPa（GB / T 2542-2012）的未烧制砖。