废旧锂离子电池真空碳热还原挥发提锂  

Lithium Extraction from Waste Lithium-ion Batteries by Vacuum Carbonthermal Reduction and Volatilization

作　　者：张婷婷 蒋搏涛 田野 范文刚 史思敏 查伊健 ZHANG Tingting;JIANG Botao;TIAN Ye;FAN Wengang;SHI Simin;ZHA Yijian(School of Metallurgical Engineering,Anhui University of Technology,Ma′anshan 243032,Anhui,China;School of Mechanical Engineering,Anhui University of Technology,Ma′anshan 243032,Anhui,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032 [2]安徽工业大学机械工程学院,安徽马鞍山243032

出　　处：《有色金属（冶炼部分）》2024年第5期39-45,共7页Nonferrous Metals（Extractive Metallurgy)

基　　金：2023年大学生创新创业训练计划(S202310360153)。

摘　　要：从废旧锂离子电池中优先提锂可缩短锂的回收流程,是提高锂综合回收率的重要手段,真空还原法可为实现该目标提供新思路。以经拆解后的废旧锂离子电池正、负电极为原料,提出了真空碳热还原挥发提锂的方法,在高温高真空度条件下,利用废旧锂离子电池的石墨负极为还原剂,将三元锂离子电池中的Li_(2)O转化为Li蒸气,挥发并冷凝回收。结果显示:在真空度28 Pa、1200℃保温4 h的优化条件下,锂挥发回收率可达到99.76%。本研究对于废旧锂离子电池真空提锂新技术的开发具有指导作用。Priority extraction of lithium from waste lithium-ion batteries can shorten the recovery process of lithium,and is an important means to improve the comprehensive recovery rate of lithium.Vacuum reduction method can provide new ideas for achieving this goal.Applying positive and negative electrode from dismantled lithium-ion batteries as raw materials,a method for extracting lithium by vacuum carbonthermal reduction and volatilization was proposed.Under the condition of high temperature and high vacuum degree,using graphite negative as reductant,Li_(2)O in ternary lithium-ion battery is converted into Li vapor and recovered after volatilizing and condensing.The results show that under the optimal conditions include vacuum degree of 28 Pa and 1200℃for 4 h,the recovery rate of lithium by volatilization can reach 99.76%.This study has a guiding function on the development of new technology of vacuum extraction of lithium from waste lithium-ion batteries.

关 键 词：废旧锂离子电池 真空提锂 碳热还原 锂 

分 类 号：TF826.3[冶金工程—有色金属冶金]