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Volume 29 Issue 9
Sep.  2022

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Hui Dang, Zhidong Chang, Hualei Zhou, Sihang Ma, Min Li, and Jialing Xiang, Extraction of lithium from the simulated pyrometallurgical slag of spent lithium-ion batteries by binary eutectic molten carbonates, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1715-1721. https://doi.org/10.1007/s12613-021-2366-3
Cite this article as:
Hui Dang, Zhidong Chang, Hualei Zhou, Sihang Ma, Min Li, and Jialing Xiang, Extraction of lithium from the simulated pyrometallurgical slag of spent lithium-ion batteries by binary eutectic molten carbonates, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1715-1721. https://doi.org/10.1007/s12613-021-2366-3
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研究论文

利用二元低共熔碳酸盐从模拟废旧锂离子电池火法渣中提取锂

  • 通讯作者:

    常志东    E-mail: zdchang@ustb.edu.cn

    周花蕾    E-mail: hlzhou@ustb.edu.cn

文章亮点

  • (1) 开发了一种从废旧锂电池火法渣中提锂的新体系。
  • (2) 通过量化计算研究了锂离子从晶格中释放的机理。
  • (3) 总结并提出了低共熔碳酸盐作焙烧剂提锂的机理。
  • 从废旧锂离子电池(LIBs)的火法渣中有效和低温提取锂仍然是一个巨大的挑战。在本工作中,将碳酸钾/碳酸钠(K2CO3/Na2CO3)作为焙烧剂用于火法渣中锂的提取,其中K2CO3和Na2CO3能够在720℃下形成低共熔盐。通过K2CO3/Na2CO3焙烧然后水浸成功地将锂从渣中提取出来。理论计算结果表明,K+/Na+吸附后Li–O键的长度增加。在K2CO3/Na2CO3焙烧后,Li+容易从LiAlSi2O6的晶格中释放出来。热重–差示扫描量热法结果表明,在720°C时可以观察到K2CO3和Na2CO3的低共熔现象,在720°C以上,炉渣和低共熔熔盐开始发生反应。X射线衍射结果表明,渣中的Li+被K2CO3中的K+交换,同时形成KAlSiO4,而Na2CO3主要起到助熔剂的作用。在焙烧温度为740℃、焙烧时间为30 min、浸出温度为50℃、浸出时间为40 min、水/焙烧样品质量比为10:1的条件下,锂的提取率最高达到93.87%。这项工作提供了一种从废旧锂离子电池的火法渣中提取锂的新体系。
  • Research Article

    Extraction of lithium from the simulated pyrometallurgical slag of spent lithium-ion batteries by binary eutectic molten carbonates

    + Author Affiliations
    • The effective and low-temperature extraction of lithium from the pyrometallurgical slag of spent lithium-ion batteries (LIBs) remains a great challenge. Herein, potassium carbonate/sodium carbonate (K2CO3/Na2CO3), which could form a eutectic molten salt system at 720°C, was used as a roasting agent to extract lithium from pyrometallurgical slag. Lithium was successfully extracted from the slag by K2CO3/Na2CO3 roasting followed by water leaching. Theoretical calculation results indicate that the lengths of Li–O bonds increase after K+/Na+ adsorption, resulting in the easy release of Li+ from the LiAlSi2O6 lattice after roasting with K2CO3/Na2CO3. Thermogravimetry–differential scanning calorimetry results indicate that the eutectic phenomenon of K2CO3 and Na2CO3 could be observed at 720°C and that the reaction of the slag and eutectic molten salts occurs at temperatures above 720°C. X-ray diffraction results suggest that Li+ in the slag is exchanged by K+ in K2CO3 with the concurrent formation of KAlSiO4, while Na2CO3 mainly functions as a fluxing agent. The lithium extraction efficiency can reach 93.87% under the optimal conditions of a roasting temperature of 740°C, roasting time of 30 min, leaching temperature of 50°C, leaching time of 40 min, and water/roasted sample mass ratio of 10:1. This work provides a new system for extracting lithium from the pyrometallurgical slag of spent LIBs.
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    • Supplementary Information s12613-021-2366-3.docx
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