2.中国科学院大学,北京 100049
1.Laboratory of Solid Waste Treatment and Recycling, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
)中锂(Li)选择性回收的问题,研究了“机械化学活化+浸出”联合工艺对Li选择性浸出的效果。对机械化学活化和浸出的工艺参数进行优化后,确定机械化学活化阶段的优化条件为:药剂用量(NH
中Fe的价态发生变化、Li与共磨剂络合。在优化的条件下,Li的浸出率为99.55%、Fe的浸出率为0,达到了选择性浸出Li的目的。本研究所开发的机械化学活化法可为高选择性回收废旧锂电池中的Li提供参考。
In order to overcome the drawback of traditional recycling methods that can not selectively recover lithium (Li) from waste LiFePO
cathode material, the performance of the mechanochemical activation and leaching joint process on the selective leaching of Li was studied. After optimizing the parameters of mechanochemical activation and leaching, the optimum conditions of mechanochemical activation stage were determined as follows: (NH
molar ratio of 1∶1, ball and materials ratio of 10∶1 and wet grinding time of 30 min; and the optimum conditions of leaching stage were determined as follows: leaching temperature of 80 ℃, 4%(volume ratio) H
, solid-liquid ratio of 50∶1 (g∶L) and leaching time of 50 min. The mechanisms of leaching reaction could be illustrated as follows. After mechanical activation, the dislocation of LiFePO
lattice and the reduction of particle size occurred. Meanwhile the change of valence state of Fe in LiFePO
and the complexation between Li and abrasives appeared during leaching process. Under the optimized conditions, the leaching rate of Li was 99.55% and the leaching rate of Fe was 0, thus the selective recovery of Li was achieved. The environmentally friendly mechanochemical activation method developed in this study could provide technical supports for the recovery of precious metals in waste lithium batteries with high selectivity
.
Effect of mechanochemical activation on particle size distribution
SEM images of different samples
XRD patterns of different samples
Effect of different MCA treatments on leaching efficiency
Effect of ball-milling parameters on Lithium leaching efficiency
Effect of leaching parameters on Lithium leaching efficiency
XRD patterns of different samples
XPS spectra of leached residual
Comparison of different technologies for recovering metals in spent lithium batteries
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