摘要
对含杂三元正极废粉和纯三元正极粉进行了氢还原-水浸提锂工艺对比试验,采用XRD、SEM-EDS和红外光谱等检测手段对反应产物进行表征分析。结果表明,纯三元正极粉较佳焙烧条件为:焙烧温度500℃、焙烧时间30 min、氢气流量100 mL/min,此条件下所得焙烧料在浸出液固比10∶1、温度90℃、时间120 min条件下浸出,锂浸出率为98.71%。含杂三元正极废粉较佳焙烧条件为:焙烧温度500℃、焙烧时间90 min、氢气流量100 mL/min,此条件下所得焙烧料在相同条件下水浸时,锂浸出率为84.74%。含杂三元正极废粉锂浸出率明显低于纯三元正极粉,原因是含杂三元正极废粉中存在F、P、Al等杂质,在还原焙烧过程中部分锂与杂质成分反应,生成水溶性差的LiF、Li_(3)PO_(4)和LiAlO_(2),进而降低了锂浸出率。
The spent NCM cathode powder with or without impurities was taken for a comparative experiment to be treated with a combined process of hydrogen reduction roasting and water leaching,and the obtained corresponding products were then characterized by using XRD,SEM-EDS and infrared spectroscopy.It is found that the leaching rate of lithium can reach 98.71%,after the NCM cathode powder without impurities is optimally roasted at 500℃for 30 min with hydrogen flow at 100 mL/min and the obtained roasted product is then leached at 90℃for 30 min with liquid-solid ratio at 10∶1.But the leaching rate of lithium is 84.74%,after the NCM cathode powder with impurities optimally roasted at 500℃for 90 min with hydrogen flow at 100 mL/min and the obtained roasted product is then water leached at the same conditions.It is shown that the leaching rate of lithium from NCM cathode powder with impurities is obviously lower than that from NCM cathode powder without impurities,due to the existence of impurities of F,P and Al,which react with part of Li during the reduction roasting process,generating LiF,Li_(3)PO_(4) and LiAlO_(2) with poor water solubility,thus reducing the lithium leaching rate.
作者
廖财斌
任国兴
赵卫夺
肖松文
LIAO Cai-bin;REN Guo-xing;ZHAO Wei-duo;XIAO Song-wen(Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China;School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;Hunan Shunhua Lithium Industry Co Ltd,Yanling 412500,Hunan,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2022年第1期85-89,共5页
Mining and Metallurgical Engineering
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)。
关键词
三元正极材料
水浸
废旧锂离子电池
还原焙烧
回收
锂
磷
氟
铝
NCM cathode material
water leaching
spent lithium-ion battery
reduction roasting
recovery
lithium
phosphorus
fluorine
aluminum