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收稿日期:
2024-05-26
修回日期:
2024-06-10
出版日期:
2024-06-25
通讯作者:
夏文成
作者简介:
刘家稳(1999—),男,硕士研究生,1770028156@qq.com
基金资助:
Jiawen LIU(), Wencheng XIA(
), Feng WU, Yaoli PENG, Guangyuan XIE
Received:
2024-05-26
Revised:
2024-06-10
Online:
2024-06-25
Contact:
Wencheng XIA
摘要:
采用K2S2O8作为氧化剂,分别通过氧化浸出、机械活化联合氧化浸出、机械固相氧化联合水浸等三种方法对废旧磷酸铁锂(LiFePO4)电池正极粉末进行处理。结果表明,在三种方式最佳条件下,氧化浸出方式的Li浸出率为89.03%(质量分数)、机械活化联合氧化浸出方式的Li浸出率为92.36%(质量分数),机械固相氧化联合水浸方式的效果最佳,Li浸出率为98.26%(质量分数)。此时,Fe化合物也与Li完全分离,选择性较高。通过添加K3PO4将浸出的锂离子以Li3PO4沉淀的形式提取回收,经电感耦合等离子体质谱仪检测,纯度可达98.67%。采用X射线衍射仪和X射线光电子能谱仪对浸出机理进行分析,结果表明,在机械化学固相氧化过程中,机械力不仅诱导了粒度的减小,还作为氧化反应的驱动力,使得Li+迁出,Fe(Ⅱ)被氧化为Fe(Ⅲ),为之后的水浸过程提供了良好条件,实现了Li和Fe的选择性分离。
中图分类号:
刘家稳, 夏文成, 武锋, 彭耀丽, 谢广元. 废旧磷酸铁锂电池机械化学固相氧化回收锂机理[J]. 化工学报, DOI: 10.11949/0438-1157.20240557.
Jiawen LIU, Wencheng XIA, Feng WU, Yaoli PENG, Guangyuan XIE. Mechanism study on mechanochemical solid-phase oxidation recovery of spent LiFePO4 batteries[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240557.
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