高校化学工程学报2017，Vol.31Issue(5)：1238-1244,7.DOI:10.3969/j.issn.1003-9015.2017.00.038
磷酸体系应用于失效磷酸铁锂电池正极材料回收的研究
Application of Phosphoric Acid System in Positive Electrode Material Recovery from Invalid Lithium Iron Phosphate Batteries
摘要
Abstract
H3PO4-H2O2 solutions were used in Li leaching from iron phosphate batteries after aluminum separation, and the concentrations of Li+ and Fe3+ were calibrated by ICP-OES. Effects of H2O2 and H3PO4 percentage, liquid solid mass ratio, reaction temperature, stirring speed, reaction time and final pH value on Li leaching ratio were studied and leaching residues at final pH value of 3.5 was analyzed by XRD. Experimental results indicate that Li leaching ratio increases with the increase of H2O2 and H3PO4 addition. However, when the dosages of H2O2 and H3PO4 are higher than 1.2 and 1.1 times of reaction stoichiometry respectively, the increase of Li leaching ratio slows down. Li leaching ratio increases first and then decreases with the increase of liquid solid mass ratio. Reaction temperature (30~60℃) has few effects on Li leaching ratio which increases along with the increase of stirring speed and reaction time, and the ratio remains almost constant when the two parameters are higher than 30 r.min-1 and 3.0 h respectively. When the final pH value of the system is adjusted to 3.5, Li leaching ratio is 99.21% and the precipitation ratio of iron is 99.99%. The leaching residue is FePO4·2H2O.关键词
磷酸铁锂电池/锂铁分离/选择性浸取/锂电池回收Key words
lithium iron phosphate batteries/separation of lithium and iron/selectively leaching/lithium battery recycling分类
化学化工引用本文复制引用
祝宏帅,孙金峰,胡启阳,李新海,赵隽,孟永强..磷酸体系应用于失效磷酸铁锂电池正极材料回收的研究[J].高校化学工程学报,2017,31(5):1238-1244,7.基金项目
国家"十二五"科技支撑项目(2015BAB06B00). （2015BAB06B00）
