摘要：为了通过浮选高效分离、回收废弃锂离子电池富钴粉体中的钴酸锂和石墨,采用增大钴酸锂和石墨的可浮性差异的方法,以Fenton试剂作为改性剂,对废弃锂离子电池中回收的富钴粉体进行表面改性处理;采用X射线光电子能谱分析Fenton试剂的改性过程,并采用透射电子显微镜对改性后的产物进行表征;通过浮选实验验证富钴粉体可浮性的改善效果。结果表明:Fenton试剂可以有效降解去除富钴粉体颗粒外层的有机杂质,使钴酸锂和石墨的表面润湿性差异增大,提高富钴粉体的可浮性;改性后钴元素的浮选富集比达到1.41,回收率达到99%。

关键词：废弃锂离子电池；富钴粉体；浮选

Abstract：To efficiently separate and recover LiCoO₂ and graphite in Co-enriched powders recovered from spent lithium-ion batteries,the method of increasing the difference of floatability of LiCoO₂ and graphite was used. Fenton reagent was used as a modifier to modify the surface of Co-enriched particles. The modification process was analyzed by XPS and the modified products were characterized by TEM. The improved effect of floatability of the Co-enriched powders was tested by the floatation experiment. The results show that Fenton reagent can effectively remove the organic impurity on the surface of Co-enriched particles and increase the difference of surface wettability of LiCoO₂ and graphite,which improves the floatability of Co-enriched powders. After modification the enrichment ratio of Co reaches 1.41 and the recovery of Co element reaches 99%.

Keywords: spent lithium-ion battery；Co-enriched powder；floatation