化工环保2024，Vol.44Issue(2)：235-241,7.DOI:10.3969/j.issn.1006-1878.2024.02.011
空气—双氧水联合氧化工艺选择性浸出废磷酸铁锂材料中的锂
Selective extraction of lithium from spent lithium iron phosphate material by combined oxidation with air and hydrogen peroxide
摘要
Abstract
Lithium in the spent lithium iron phosphate material(powder of cathode material from spent lithium iron phosphate battery)was selectively leached by combined oxidation with air and hydrogen peroxide,and then recovered in the form of lithium carbonate after lithium precipitation.The experimental results show that after air aeration for 300 min under the conditions of a liquid-solid ratio of 4 mL/g,a molar ratio of H2SO4 to Li of 0.5,a stirring speed of 250 r/min,and a reaction temperature of 50℃,and then reaction for 120 min with H2O2 dropwise addition(with a molar ratio of H2O2 to Li of 0.29)at the same reaction temperature and stirring speed,the leaching rate of lithium,iron and phosphorus is 93.47%,17.26%and 19.83%,respectively.This process can decrease the amount of hydrogen peroxide by more than 75%compared with the hydrogen peroxide oxidation process alone,significantly reducing recycling costs.Dissolved oxygen concentration has an important influence on the existence mode of Fe3+ in the leaching system:at higher concentrations(with air aeration),iron phosphate is dominant;at lower concentrations(without air aeration but in contact with air),iron hydroxide is dominant.关键词
废磷酸铁锂电池/空气氧化/选择性浸出/碳酸锂Key words
spent lithium iron phosphate battery/air oxidation/selective extraction/lithium carbonate分类
资源环境引用本文复制引用
刘慧勇,杨茜,傅云晗,母家林,旷戈..空气—双氧水联合氧化工艺选择性浸出废磷酸铁锂材料中的锂[J].化工环保,2024,44(2):235-241,7.基金项目
福建省科技厅引导性项目(2020H0010). （2020H0010）
