三元正极废粉与聚丙烯共热解-水浸选择性提锂研究

Selective Extraction of Lithium by Co-Pyrolysis of Spent NCM Cathode Powder and Polypropylene Followed by Water Leaching

开展了三元正极废粉与聚丙烯型隔膜共热解-水浸选择性提锂试验,并对反应产物进行了表征。结果表明,在聚丙烯用量40%、热解温度550℃、热解时间2 h、氩气流速200 mL/min条件下共热解,热解产物水浸,锂浸出率为87.92%。锂损失的主要原因是共热解过程中形成了不溶于水的锂钴氧化物。

An experiment was conducted on selective extraction of lithium by co-pyrolysis of spent NCM cathode powder and polypropylene followed by water leaching,and the obtained pyrolysis products were characterized.In the experiment,co-pyrolysis of NCM cathode powder with 40%polypropylene ran at 550℃for 2 h,with argon flow rate at 200 mL/min,and then the obtained pyrolysis product was subjected to water leaching,resulting in the lithium leaching rate of 87.92%.It is found that lithium loss is mainly attributed to the formation of water-insoluble lithium cobalt oxide during co-pyrolysis.