A stepwise recovery of metals from hybrid cathodes of spent Li-ion batteries with leaching-flotation-precipitation process
A stepwise recovery of metals from hybrid cathodes of spent Li-ion batteries with leaching-flotation-precipitation process
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DOI：
10.1016/j.jpowsour.2016.06.072
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发表时间：
2016-09-01
影响因子：
9.2
通讯作者：
Su, Shengpeng
中科院分区：
文献类型：
--
作者：
Huang, Yanfang;Han, Guihong;Su, Shengpeng
回收废旧锂离子电池负极中的有价金属具有经济效益和环境效益。采用分步浮选-浮选-沉淀工艺从混合型正极材料（LiFePO 4和LiMn 2 O 4混合废料）中分离回收Li/Fe/Mn。通过析因设计、热力学计算、XRD和SEM表征，确定并分析了分步回收工艺的最佳操作条件。首先，在酸浸步骤中使用HCl辅助H2 O2从阴极释放Li/Fe/Mn离子。在酸性环境中，金属的溶解性为Li > Fe > Mn。然后，在浮选步骤中，Fe 3+离子被选择性地浮选并作为FeCl 3从浸出液中回收。最后，分别用饱和KMnO 4溶液和热饱和Na 3 PO 4溶液将Mn 2 +/Mn 3+和Li+依次沉淀分离为MnO 2/Mn 2 O 3和Li 3 PO 4。在最佳工艺条件下，锂、铁、锰的总回收率分别为80.93 ± 0.16%、85.40 ± 0.12%、81.02 ± 0.08%。锂、铁和锰化合物的纯度分别为99.32 +/-0.07%、97.91 +/- 0.05%和98.73 +/-0.05%。该分步工艺可为工业上从废旧锂离子电池负极中有效分离和回收有价金属提供一种替代方法。(C)2016爱思唯尔B. V.保留所有权利。
The recovering of valuable metals in spent lithium-ion battery cathodes brings about economic and environmental benefits. A stepwise leaching-flotation-precipitation process is adopted to separate and recover Li/Fe/Mn from the mixed types of cathode materials (hybrid wastes of LiFePO4 and LiMn2O4). The optimal operating conditions for the stepwise recovery process are determined and analyzed by factorial design, thermodynamics calculation, XRD and SEM characterization in this study. First, Li/Fe/Mn ions are released from the cathode using HCI assisted with H2O2 in the acid leaching step. The leachability of metals follows the series Li > Fe > Mn in the acidic environment. Then Fe3+ ions are selectively floated and recovered as FeCl3 from the leachate in the flotation step. Finally, Mn2+/Mn3+ and Li+ ions are sequentially precipitated and separated as MnO2/Mn2O3 and Li3PO4 using saturated KMnO4 solution and hot saturated Na3PO4 solution, respectively. Under the optimized and advisable conditions, the total recovery of Li, Fe and Mn is respectively 80.93 +/- 0.16%, 85.40 +/- 0.12% and 81.02 +/- 0.08%. The purity for lithium, ferrum and manganese compounds is respectively 99.32 +/- 0.07%, 97.91 +/- 0.05% and 98.73 +/- 0.05%. This stepwise process could provide an alternative way for the effective separation and recovery of metal values from spent Li-ion battery cathodes in industry. (C) 2016 Elsevier B.V. All rights reserved.