An environmental benign process for cobalt and lithium recovery from spent lithium-ion batteries by mechanochemical approach
An environmental benign process for cobalt and lithium recovery from spent lithium-ion batteries by mechanochemical approach
复制标题
通过机械化学方法从废旧锂离子电池中回收钴和锂的环境友好工艺
DOI：
10.1016/j.wasman.2016.03.006
复制
发表时间：
2016
期刊：
影响因子：
8.1
通讯作者：
Zhang Fu-Shen
中科院分区：
文献类型：
--
作者：
Wang Meng-Meng;Zhang Cong-Cong;Zhang Fu-Shen
在目前的研究中，开发了一种环境友好的工艺，即机械化学方法，用于从废锂离子电池（LIBs）中回收钴和锂。该工艺的主要优点是既不使用腐蚀性酸，也不使用强氧化剂。在该工艺中，首先将钴酸锂（从废锂中获得）与各种添加剂在密闭球磨系统中共磨，然后通过水浸法很容易地回收Co和Li。结果表明，在licoo2与EDTA质量比为1:4、磨矿时间为4 h、转速为600 r/min、球粉质量比为80:1的最佳条件下，EDTA为最佳助磨剂，Co回收率为98%，Li回收率为99%。机理研究表明，EDTA的两个氮原子和四个羟基氧原子提供的孤对电子可以通过固固反应进入Co和Li的空轨道，从而形成稳定的水溶性金属螯合物Li-EDTA和Co-EDTA。此外，Co和Li的分离可以通过化学沉淀法实现。本研究为从废lib中回收Co和Li提供了高效、环保的工艺。
In the current study, an environmental benign process namely mechanochemical approach was developed for cobalt and lithium recovery from spent lithium-ion batteries (LIBs). The main merit of the process was that neither corrosive acid nor strong oxidant was applied. In the proposed process, lithium cobalt oxide (obtained from spent LIBs) was firstly co-grinded with various additives in a hermetic ball milling system, then Co and Li could be easily recovered by a water leaching procedure. It was found that EDTA was the most suitable co-grinding reagent, and 98% of Co and 99% of Li were respectively recovered under optimum conditions: LiCoO2to EDTA mass ratio 1:4, milling time 4 h, rotary speed 600 r/min and ball-to-powder mass ratio 80:1, respectively. Mechanisms study implied that lone pair electrons provided by two nitrogen atoms and four hydroxyl oxygen atoms of EDTA could enter the empty orbit of Co and Li by solid-solid reaction, thus forming stable and water-soluble metal chelates Li-EDTA and Co-EDTA. Moreover, the separation of Co and Li could be achieved through a chemical precipitation approach. This study provides a high efficiency and environmentally friendly process for Co and Li recovery from spent LIBs.