Separation of lithium and cobalt from waste lithium-ion batteries via bipolar membrane electrodialysis coupled with chelation
Separation of lithium and cobalt from waste lithium-ion batteries via bipolar membrane electrodialysis coupled with chelation
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DOI：
10.1016/j.seppur.2013.04.014
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发表时间：
2013-07-24
影响因子：
8.6
通讯作者：
Yanagisawa, Yukio
中科院分区：
文献类型：
--
作者：
Iizuka, Atsushi;Yamashita, Yasunobu;Yanagisawa, Yukio
提出了一种基于双极膜电渗析与金属离子螯合耦合的新型溶液金属分离工艺。该方法被应用于锂和钴的混合溶液，如在回收废旧锂离子电池。当将螯合剂乙二胺四乙酸（EDTA）加入到锂离子和钴离子的混合溶液中时，在pH > 4时，几乎所有的钴离子都被EDTA螯合形成阴离子，而锂离子几乎不被螯合。进料溶液的电渗析使用三池型电渗析系统进行，该系统具有由两个离子交换膜和一个双极膜组成的单元。使用施加的电场将锂输送到锂回收电池，并且将钴输送到钴回收电池。回收槽中每种金属的选择性约为99%。研究了EDTA初始浓度和pH值对反应的影响。金属离子在离子交换膜中的吸收进行了观察，这可以通过使用连续的半间歇操作来避免。(C)2013爱思唯尔有限公司版权所有。
A new type of process for separating metals in solution, based on bipolar membrane electrodialysis coupled with metal-ion chelation, is proposed. The method was applied to a mixed solution of lithium and cobalt, as in the recycling of waste lithium-ion batteries. When a chelating agent, ethylenediaminetetraacetic acid (EDTA), was added to a mixed solution of lithium ions and cobalt ions, almost all the cobalt ions were chelated by EDTA to form anions, whereas lithium ions were hardly chelated, at pH > 4. Electrodialysis of the feed solution was conducted using a three-cell-type electrodialysis system, with a unit consisting of two ion-exchange membranes and a bipolar membrane. Lithium was transported to the lithium recovery cell and cobalt was transported to the cobalt recovery cell, using an applied electric field. The selectivity for each metal in the recovery cell was about 99%. The effects of initial EDTA concentration and pH were examined. Absorption of metal ions in the ion-exchange membranes was observed; this can be avoided by using a continuous semi-batch operation. (C) 2013 Elsevier B.V. All rights reserved.