Separation of Li and Co from the active mass of spent Li-ion batteries by selective sulfating roasting with sodium bisulfate and water leaching
Separation of Li and Co from the active mass of spent Li-ion batteries by selective sulfating roasting with sodium bisulfate and water leaching
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DOI：
10.1016/j.mineng.2018.06.023
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发表时间：
2018-09
影响因子：
4.8
通讯作者：
Dahui Wang;Xiaodong Zhang;Huaijing Chen;Jianyong Sun
中科院分区：
文献类型：
--
作者：
Dahui Wang;Xiaodong Zhang;Huaijing Chen;Jianyong Sun
提出了一种利用NaHSO 4·H2O选择性硫酸化焙烧分离锂钴回收废旧锂离子电池中有价金属的新方法。研究了NaHSO 4·H2O添加比例对焙烧机理的影响。采用热重-差示扫描量热法、X射线衍射、扫描电镜和电感耦合等离子体等分析手段，研究了硫酸化焙烧和水浸过程中Li和Co元素的赋存状态演化。LiCoO_2和NaHSO_4·H_2O的混合物具有两个明显的失重平台，吸热峰在25-600 °C。随着混合物中NaHSO 4·H2O比例的增加，Li和Co元素的赋存状态演变为：LiCoO 2 → LiNa（SO 4）和LiCoO 2 → Co 3 O 4。经去离子水洗涤后，质量比为1：1.40的产物中Co和Li元素的含量分别为72.56%和0.53%。锂、钴元素的不同赋存状态导致了硫酸化焙烧过程中锂、钴元素的分离。
This paper presents a novel approach for recovering valuable metal from spent Li-ion batteries by separating Li and Co by using selective sulfating roasting with NaHSO4·H2O. This study focuses on the effects of the additive ratio of NaHSO4·H2O on the roasting mechanism. The occurrence evolution of the Li and Co elements during sulfating roasting and water leaching is studied by thermogravimetry–differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and inductively coupled plasma. The mixtures of spent LiCoO2and NaHSO4·H2O possesses two obvious weightlessness platforms with corresponding endothermic peaks at 25–600 °C. As the proportion of NaHSO4·H2O in mixtures increases, the occurrence of the Li and Co elements evolves as follows: LiCoO2→ LiNa(SO4) and LiCoO2→ Co3O4. After being washed with deionized water, the concentrations of the Co and Li elements from the washed products in a mass ratio of 1:1.40 are 72.56% and 0.53%, respectively. The different occurrence forms of the Li and Co elements lead to their separation during sulfating roasting.