Efficient AlN decomposition and Al species transformation in secondary aluminum dross through co-sintering with waste sodium acetate  

作　　者：Xiang Li Nengwu Zhu Yunhao Xi Fei Li Pengfei Zhang 

机构地区：[1]School of Environment and Energy,South China University of Technology,Guangzhou 510006,China [2]The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education,Guangzhou 510006,China [3]Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling,Guangzhou 510006,China [4]Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling,Guangzhou 510006,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第5期1079-1090,共12页矿物冶金与材料学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.22276062);the Guangdong Science and Technology Program,China(No.2020B121201003).

摘　　要：Secondary aluminum dross(SAD)is a rich source of recyclable aluminum but poses considerable risk due to its high AlN con-tent.Therefore,thoroughly removing AlN is essential,but intricate aluminum components and expensive additives pose challenges to the process.In this study,waste sodium acetate is proposed as an environmentally friendly additive for completely removing AlN and enhan-cing the extraction of aluminum from SAD.Through the exothermic decomposition of NaAc,reactions can occur at 850℃.AlN removal efficiency reached 93.19%after sintering,whereas Al leaching efficiency in the subsequent leaching process reached 90.49%,which were 37.86%and 375.26%higher than the removal efficiency of the control,respectively.These favorable results were attributed to the com-prehensive transformation of aluminum species.The formation of soluble phase Na_(1.95)Al_(1.95)Si_(0.05)O_(4)occurred during the destruction of the Al_(2)O_(3)layer surrounding AlN and the transformation of other aluminum components.AlN decomposed upon contact with NaAc.There-fore,this study utilizes the decomposition properties of NaAc to provide an efficient and environmentally friendly route for removing AlN and extracting Al from SAD.

关 键 词：secondary aluminum dross waste sodium acetate aluminum extraction phase transformation Na deconstruction 

分 类 号：TF821[冶金工程—有色金属冶金]