三元正极废粉还原焙烧—水浸提锂过程氟磷杂质的影响  

Effect of Fluorine and Phosphorus Impurity on Recovery of Lithium from Spent NCM Cathode Powder by Reduction Roasting-Water Leaching Process

作　　者：廖财斌 任国兴 肖松文[1] LIAO Cai-bin;REN Guo-xing;XIAO Song-wen(Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha 410012,China;School of Metallurgy and Environment,Central South University,Changsha 410083,China)

机构地区：[1]长沙矿冶研究院有限责任公司,长沙410012 [2]中南大学冶金与环境学院,长沙410083

出　　处：《有色金属（冶炼部分）》2020年第12期42-47,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：长沙市科技支撑计划项目(kq1602212);中央企业电动车产业联盟共性技术项目(JS-211)。

摘　　要：针对含氟/磷杂质组分的三元正极废粉和纯三元正极粉开展还原焙烧—水浸试验,发现相同试验条件下,含杂三元正极废粉锂的浸出率明显低于纯三元正极粉,氟/磷杂质组分是影响还原焙烧—水浸提锂效果的关键因素,还原焙烧过程中,由于氟/磷的影响,正极材料中的锂部分转化为不溶于水的LiF和Li3PO4,进而损失于水浸渣中。Spent NCM cathode powder with/without fluorine and phosphorus impurities were treated by reduction roasting-water leaching.The results show that lithium leaching efficiency in spent NCM cathode powder containing fluorine and phosphorus impurities was significantly lower than that of pure NCM cathode powder under same experimental conditions.Fluorine and phosphorus impurities are the key factors affecting lithium recovery during reduction roasting-water leaching,which can be explained by that parts of lithium in NCM cathode powder is converted into insoluble LiF and Li3PO4 during reduction roasting process.

关 键 词：废旧锂离子电池 三元正极粉 还原焙烧 锂 磷 氟 

分 类 号：TF8263[冶金工程—有色金属冶金]