Cobalt and lithium recovery from active mass of spent Li-ion batteries: Theoretical and experimental approach
Cobalt and lithium recovery from active mass of spent Li-ion batteries: Theoretical and experimental approach
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DOI：
10.1016/j.hydromet.2016.03.007
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发表时间：
2016-08-01
期刊：
影响因子：
4.7
通讯作者：
Orac, Dusan
中科院分区：
文献类型：
--
作者：
Takacova, Zita;Havlik, Tomas;Orac, Dusan
对从废旧锂电池中回收钴和锂的工艺进行了实验研究，并对回收过程中各组分的行为进行了理论解释。采用H_2SO_4和HCl两种浸取剂对钴、锂的浸取效果进行了比较。结果表明，用HCl作浸出剂比用H_2SO_4作浸出剂更合适。钴和锂回收的最佳条件是：2 M HCl，60-80摄氏度，浸出时间90分钟。这项工作还解释了温度对钴和锂的提取从活性物质的活化能的情况下，这两种浸出剂的影响。结果发现，在硫酸中的钴萃取发生在两个时间段。在第一时间段，在从浸出开始的15至20分钟内，该过程由化学反应速率控制（Ea（Co）= 43-48 kJ中心点mol（-1））。在第二时间段，该过程转变为扩散控制，如从Ea（Co）= 3- 3.5kJ中心点mol（-1）的值所证明的。在盐酸条件下，第一时间段钴的萃取受化学反应速率控制，Ea（Co）= 40-44 kJ中心点mol（-1）。在第二时间段，过程转变为混合机制，Ea（Co）= 20-26 kJ中心点mol（-1）。在两个时间段内，锂的提取都是由扩散控制的，或者以混合模式发生。两种浸出剂的Ea（Li）均在2 ~ 20 kJ中心点mol（-1）之间。精细结构的研究证实了钴和锂提取影响活性物质的内部结构的假设，该活性物质主要由LiCoO 2组成，钴提取依赖于从LiCoO 2结构中提取锂。(C)2016爱思唯尔B. V.保留所有权利。
The paper is focused on the experimental study of cobalt and lithium recovery from active mass of spent lithium batteries with theoretical explanation of behavior of components in this process. Two leaching agents - H2SO4 and HCI were used in order to compare their effects on cobalt and lithium extraction. It follows from the results that using HCl as a leaching reagent is more appropriate than using H2SO4. Optimal conditions for cobalt and lithium recovery were:2 M HCI, 60-80 degrees C, leaching time 90 min. The work also explains the influence of temperature on cobalt and lithium extraction from active mass by activation energy in case of both leaching agents. It was found that the cobalt extraction in sulfuric acid occurs in two time periods. In the first time period, in 15 to 20 min from the beginning of leaching, the process is controlled by the rate of a chemical reaction (Ea(Co) = 43-48 kJ center dot mol(-1)). In second time period, the process changes to diffusion controlled, as it is evidenced from the value of Ea(Co) = 3-3.5 kJ center dot mol(-1). In the case of HCI, cobalt extraction in first time period is controlled by the rate of chemical reaction, Ea(Co) = 40-44 kJ center dot mol(-1). In the second time period, process is converted to a mixed mechanism, Ea(Co) = 20-26 kJ center dot mol(-1). Lithium extraction is controlled by the diffusion in both of time periods, or occurs in mixed mode. Ea(Li) is between 2 and 20 kJ center dot mol(-1) in both of leaching agent. The study of the fine structure confirmed the hypothesis that on the cobalt and lithium extraction affects the internal structure of the active mass, which consists primarily of LiCoO2 and the cobalt extraction is dependent on lithium extraction from the LiCoO2 structure. (C) 2016 Elsevier B.V. All rights reserved.