废旧锂离子电池正极材料中钴铝同浸过程研究  

Study on Cobalt and Aluminum Leaching Process from Spent Lithium Ion Batteries Cathode Materials

作　　者：尹晓莹[1] 满瑞林[1] 赵鹏飞[2] 常伟[1] 徐筱群[1] 

机构地区：[1]中南大学化学化工学院,“有色金属资源化学”教育部重点实验室,长沙410083 [2]中国恩菲工程技术有限公司,北京100038

出　　处：《有色金属（冶炼部分）》2013年第3期11-16,共6页Nonferrous Metals（Extractive Metallurgy)

摘　　要：通过基础热力学数据计算以及绘制反应体系的E-pH图,对废旧锂离子电池正极材料回收中钴铝同浸过程进行研究,考察了硫酸浓度、浸出时间、浸出温度、双氧水用量及液固比对钴、铝浸出率的影响。结果表明,在273K,-0.277<E<(1.612-0.1182pH),pH<2.17时,铝可以将LiCoO2转化为Co2+,但由于动力学原因,钴的浸出并不完全,需要加入辅助还原剂双氧水。正极在1.5mol/L H2SO4、反应时间120min、反应温度85℃、双氧水0.5mL/g的条件下浸出,钴浸出率可以达到98.5%,同时可以回收76.5%的铝箔。使用碳酸氢铵除铝,终点pH为4.5时,可以除去浸出液中98.6%的铝。Through calculation of basic thermodynamics data and drawing of EpH diagram of reaction sys tem, the leaching process of recovery of cobalt and aluminum from spent lithium ion battery cathode mate rials was carried out. The effects of sulfuric acid concentration, leaching time, leaching temperature, hy drogen peroxide dosage and ratio of solid to liquid （L/S） on leaching rate of cobalt and aluminum were in vestigated. The results show that under the conditions including 273 K, 0. 277〈E〈（1. 612 0. 1182pH）, and pH〈2.17, aluminum can transform LiCoO2 into Co2＋. As the leaching rate of cobalt was relatively low due to the limit in dynamics, a proper auxiliary reductant was necessary in the leaching process. The leaching rate of cobalt is 98.5% and the recovery of aluminum foil is 76.5% under the opti mum leaching conditions including concentration of H2SO4 of 5 mol/L, reacting time of 120 min, tempera ture of 85 ℃, and dosage of hydrogen peroxide of 0.5 mL/g, 98.6% of aluminum in lixivium is removed by ammonium hydrogen carbonate with the end pH value of 4.5.

关 键 词：废旧锂离子电池 热力学 钴铝同浸 双氧水 

分 类 号：TF816[冶金工程—有色金属冶金]