公开(公告)号：US11697594B2

公开(公告)日：2023-07-11

申请号：US17764561

申请日：2021-01-16

申请人： CENTRAL SOUTH UNIVERSITY

发明人： Yanqing Lai ,  Zhongliang Tian ,  Kai Yang ,  Yifan Li ,  Peiyu Gong ,  Bo Hong ,  Jie Li

IPC分类号： C01B32/205 ,  C25C3/08 ,  B09B3/70 ,  B09B3/40 ,  B09B101/15

CPC分类号： C01B32/205 ,  B09B3/40 ,  B09B3/70 ,  C25C3/08 ,  B09B2101/15

摘要： A method for recycling spent carbon cathode of aluminum electrolysis includes the following steps: (1) crushing and sieving spent carbon cathode, to obtain carbon particles; (2) mixing the carbon particles with a sulfuric acid solution, to obtain a slurry A, and then performing pressure leaching, to obtain a slurry B; (3) evaporating and concentrating the slurry B until a mass percentage of water is lower than 8%, to obtain a slurry C; (4) adding concentrated sulfuric acid to the slurry C to obtain a slurry D, then roasting the slurry D at 150-300° C. for 0.5-10 h, and then roasting at 300-600° C. for 0.5-8 h, to obtain the roasted carbon; and calcining the roasted carbon at a high temperature, to obtain the purified carbon, or mixing the roasted carbon with a leaching agent, and performing leaching, filtering, and washing, to obtain the purified carbon.