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Volume 32 Issue 1
Jan.  2025

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Junjie Shi, Changle Hou, Jingjing Dong, Dong Chen,  and Jianzhong Li, Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO2 cathode material, Int. J. Miner. Metall. Mater., 32(2025), No. 1, pp. 80-91. https://doi.org/10.1007/s12613-024-2898-4
Cite this article as:
Junjie Shi, Changle Hou, Jingjing Dong, Dong Chen,  and Jianzhong Li, Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO2 cathode material, Int. J. Miner. Metall. Mater., 32(2025), No. 1, pp. 80-91. https://doi.org/10.1007/s12613-024-2898-4
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研究论文

低温氯化焙烧技术:用于从废弃LiCoO2正极材料中同步回收有价金属



  • 通讯作者:

    石俊杰    E-mail: junjieshi@126.com

文章亮点

  • (1) 系统的研究了焙烧温度、焙烧时间、原料配比对有价金属回收率的影响。
  • (2) 开发了一种低温氯化焙烧技术并研究了其反应机理。
  • (3) 对废旧LiCoO2正极材料焙烧前后微观组织进行了分析。
  • (4) 阐明了低温氯化焙烧工艺的反应机理。
  • 随着废弃锂离子电池(LIBs)报废量的不断增加,适当回收废弃LIBs对于循环经济的发展变得至关重要。本研究对氯化焙烧动力学进行了系统分析,并提出了一种新的两步氯化焙烧工艺,该工艺整合了热力学原理,用于回收LIB正极材料。根据热重分析数据使用模型法、无模型法和Z(α)函数法获得的氯化反应的活化能为88.41 kJ/mol。结果表明,当转化率小于等于0.5时,反应主要由一阶(F1)模型主导,当转化率超过0.5时,反应转向二阶(F2)模型。通过深入研究焙烧温度、焙烧时间和NH4Cl与LiCoO2的质量比对反应的影响,确定了最佳条件。在最佳条件下,即400°C、20分钟和NH4Cl/LiCoO2质量比为3:1时,Li和Co的浸出效率分别达到了99.43%和99.05%。对焙烧产品的分析表明,LiCoO2中的有价金属转化为CoCl2和LiCl。此外,阐明了反应机制,为基于晶体结构视角的新型低温氯化焙烧技术提供了见解。这项技术可以指导开发低能耗、低二次污染、高回收效率和高附加值的LIB回收工艺。
  • Research Article

    Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO2 cathode material

    + Author Affiliations
    • With the continuous increase in the disposal volume of spent lithium-ion batteries (LIBs), properly recycling spent LIBs has become essential for the advancement of the circular economy. This study presents a systematic analysis of the chlorination roasting kinetics and proposes a new two-step chlorination roasting process that integrates thermodynamics for the recycling of LIB cathode materials. The activation energy for the chloride reaction was 88.41 kJ/mol according to thermogravimetric analysis–derivative thermogravimetry data obtained by using model-free, model-fitting, and Z(α) function (α is conversion rate). Results indicated that the reaction was dominated by the first-order (F1) model when the conversion rate was less than or equal to 0.5 and shifted to the second-order (F2) model when the conversion rate exceeded 0.5. Optimal conditions were determined by thoroughly investigating the effects of roasting temperature, roasting time, and the mass ratio of NH4Cl to LiCoO2. Under the optimal conditions, namely 400°C, 20 min, and NH4Cl/LiCoO2 mass ratio of 3:1, the leaching efficiency of Li and Co reached 99.43% and 99.05%, respectively. Analysis of the roasted products revealed that valuable metals in LiCoO2 transformed into CoCl2 and LiCl. Furthermore, the reaction mechanism was elucidated, providing insights for the establishment of a novel low-temperature chlorination roasting technology based on a crystal structure perspective. This technology can guide the development of LIB recycling processes with low energy consumption, low secondary pollution, high recovery efficiency, and high added value.
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