Anode cover material holds marked importance owing to its effect of maintaining the thermal balance of aluminum reduction cells, and is categorized as solid waste because of its continuous accumulation. However, cover materials contain large amounts of alumina and fluoride; thus, can be considered for strategic resource recovery. This research has developed a process for separating alumina and recovering aluminum fluoride from anode cover materials by aluminum salt solution leaching. In the present work, the effects of different factors on the leaching behaviors of sodium and fluoride during aluminum salt solution leaching were investigated. The results showed that 98.1 % sodium and 95.1 % fluoride were extracted when the Al³⁺ concentration was 2.5 mol/L, the liquid to solid ratio was 20 mL/g, and the stirring speed was 300 rpm at 90 °C for 2 h. Aluminum and fluoride were then precipitated as aluminum hydroxyfluoride hydrate (AHF) from the leachate. The aluminum fluoride (AlF₃) product with high purity was obtained by calcining AHF precipitation, and the average particle size was 66.1 μm. This work demonstrates significant application potential on green recycling of anode cover materials and realize a high-value utilization of aluminum and fluoride resources. This plays a crucial role in the life cycle assessment (LCA) of the anode cover material.

阳极覆盖材料因其保持铝电解槽热平衡的作用而具有显着的重要性，并因其不断积累而被归类为固体废物。但是，覆盖材料含有大量的氧化铝和氟化物；因此，可以考虑进行战略资源回收。本研究开发了一种通过铝盐溶液浸出从阳极覆盖材料中分离氧化铝和回收氟化铝的工艺。在本工作中，研究了不同因素对铝盐溶液浸出过程中钠和氟化物浸出行为的影响。结果表明，当 Al ³⁺浓度为2.5 mol/L，液固比为20 mL/g，搅拌速度为300 rpm，90 ℃搅拌2 h。然后铝和氟化物从渗滤液中以水合羟基氟化铝 (AHF) 的形式沉淀出来。通过煅烧AHF沉淀得到高纯度的氟化铝(AlF ₃ )产品，平均粒径为66.1 μm。该工作在阳极覆盖材料的绿色回收和实现铝和氟化物资源的高价值利用方面具有重要的应用潜力。这在阳极覆盖材料的生命周期评估 (LCA) 中起着至关重要的作用。