Black aluminum dross (BAD) is a solid hazardous waste produced during the remelting of aluminum alloy scrap and contains a large amount of aluminum and other valuable elements. However, the extraction of its high-value components is challenging because of its complex phase and chemical composition. In this paper, a new process for recovering aluminum and other valuable elements from BAD is reported, which consists of three steps, i.e., catalytic hydrolysis of aluminum nitride, calcination of the obtained aluminum hydroxide, and molten salt electrolysis to prepare aluminum alloy. Under the established optimal conditions for the hydrolysis of aluminum nitride, 4 wt% NaOH, a temperature of 90°C, a liquid-solid ratio of 6 mL g⁻¹, and a reaction time of 3 hours, the recovery rates of nitrogen and chloride salts are 88.8% and 97.57%, respectively. Bayerite and pseudo-boehmite generated by the hydrolysis of aluminum nitride present in BAD were converted into γ-Al₂O₃ when calcining the material at 800°C for 2 hours resulting in a multi-metal oxide with high alumina content. Aluminum alloy was prepared by electrolysis of the material in the Na₃AlF₆-AlF₃-Al₂O₃ electrolyte system. This innovative technology can recover 97% of aluminum and other valuable metals (including silicon) in BAD and is a new route to achieve clean and high-value recycling of BAD.

黑铝渣（BAD）是铝合金废料重熔过程中产生的一种固体危险废物，含有大量的铝等有价元素。然而，由于其复杂的相和化学成分，其高价值成分的提取具有挑战性。本文报道了一种从BAD中回收铝和其他有价元素的新工艺，该工艺由氮化铝催化水解、所得氢氧化铝煅烧、熔盐电解制备铝合金三个步骤组成。在确定的水解氮化铝的最佳条件下，4 wt% NaOH，温度为90°C，液固比为6 mL g ^-1，反应时间为3小时，氮盐和氯盐的回收率分别为88.8%和97.57%。当在 800°C 下煅烧材料 2 小时时，BAD 中存在的氮化铝水解产生的三羟铝石和假勃姆石转化为 γ-Al ₂ O ₃，从而产生具有高氧化铝含量的多金属氧化物。通过在Na ₃ AlF ₆ -AlF ₃ -Al ₂ O ₃电解质体系中电解该材料制备铝合金。这项创新技术可以回收BAD中97%的铝和其他有价金属（包括硅），是实现BAD清洁和高价值回收的新途径。