还原焙烧分步浸出工艺从废旧锂离子电池中回收有价金属  

Recovery of Valuable Metals from Spent Lithium Ion Batteries via Reduction Roasting and Sulfamic Acid Leaching

作　　者：潘越 叶华[1] 李昊昱 PAN Yue;YE Hua;LI Hao-yu(College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《有色金属（冶炼部分）》2022年第10期1-7,共7页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(52174391)。

摘　　要：以废旧三元正极材料作为原料,提出了还原焙烧与氨基磺酸浸出相结合的工艺,提高锂的回收效率,同时实现组分的分步分离回收。在焙烧温度650℃、碳用量10%、还原焙烧时间90 min条件下,三元正极材料被还原为Li_(2)CO_(3)、NiO、MnO、Ni、Co的混合物,还原焙烧产物分步浸出,水浸回收锂,酸浸回收镍、钴、锰。采用氨基磺酸浸出水浸渣,最佳酸浸条件:氨基磺酸浓度0.75 mol/L、浸出温度60℃、固液比28 g/L、浸出时间40 min,此条件下镍、钴、锰的浸出率分别可以达到98.77%、98.71%、98.45%。A process combining reduction roasting with sulfamic acid leaching was proposed for leaching of valuable metals from spent Li_(x)NiCo_(y)Mn_(1-x-y)O_(2)(NCM)cathode materials to improve recovery efficiency of lithium, and realize separation and recovery of components.The results indicate that Li_(2)CO_(3),NiO,MnO,Ni and Co are mainly reduction products at 650 ℃ for 90 min with 10% carbon in the reduction roasting process.Lithium is effectively recovered through reduction roasting-water leaching from spent NCM cathode materials.Subsequently, sulfamic acid is selected as leaching agent to recover Ni, Co, Mn.Leaching rate of Ni, Co, and Mn is 98.77%,98.71% and 98.45% respectively under the optimum acid leaching conditions including sulfamic acid concentration of 0.75 mol/L,leaching temperature of 60 ℃,ratio of solid to liquid of 28 g/L,and leaching time of 40 min.

关 键 词：锂离子电池 浸出 还原焙烧 氨基磺酸 

分 类 号：TF803.2[冶金工程—有色金属冶金]