基于响应面模型优化磷酸铁锂中锂的回收  

Research on lithium element recycling from spent LiFePO 4 cathode by mechanochemical method based on a response surface model

作　　者：王密[1] 曹武卿 王明理 WANG Mi;CAO Wuqing;WANG Mingli(Xi′an Medical college,Xi′an 710309,China;Xi′an Siyuan University,Xi′an 710309,China)

机构地区：[1]西安医学高等专科学校,陕西西安710309 [2]西安思源学院,陕西西安710309

出　　处：《化工科技》2023年第6期49-53,共5页Science & Technology in Chemical Industry

基　　金：陕西省科技厅项目(19312204D)。

摘　　要：磷酸铁锂(LFP)是一种价格低廉、安全性高、应用广泛的锂离子电池正极材料,废旧LFP电池中锂元素的高效回收对环境保护和资源利用均有重要意义。采用机械化学法,以柠檬酸和双氧水为助磨剂,可以显著提高锂元素的回收效率。基于响应面模型,发现球料比、柠檬酸浓度、双氧水体积和研磨时间是影响回收率的显著因素。最优实验条件为:球料比31.24 g/g,柠檬酸浓度16.72 g/g,双氧水体积1.66 mL,研磨时间3.26 h,转速524 r/min,此时锂元素回收率可以达到98.81%,与实验结果98.37%非常吻合。Lithium iron phosphate(LFP)is a low-cost,high-safety and widely-used cathode for lithium-ion batteries.The recovery of lithium element from spent LFP is of great significance to environmental protection and resource utilization.By mechanochemical method,using citric acid and H 2O 2 as co-grinding agents,the recovery efficiency of lithium was significantly improved.Based on response surface model,it was found that ball to powder ratio(BPR),citric acid concentration,hydrogen peroxide volume,and the grinding time were the significant factors affecting the recovery efficiency.The optimal experimental conditions were obtained,i.e.,BPR was 31.24 g/g,citric acid concentration was 16.72 g/g,H 2O 2 Volume was 1.66 mL,grinding time was 3.26 h,rotation speed was 524 rpm.And then,the recovery efficiency of lithium element could reach 98.81%,which was consistent with the experimental result of 98.37%.

关 键 词：废旧电池 磷酸铁锂 机械化学法 响应面 

分 类 号：TQ152[化学工程—电化学工业]