College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
Waste Manag. 2012 Aug;32(8):1575-82. doi: 10.1016/j.wasman.2012.03.027. Epub 2012 Apr 23.
Spent lithium-ion batteries containing lots of strategic resources such as cobalt and lithium are considered as an attractive secondary resource. In this work, an environmentally compatible process based on vacuum pyrolysis, oxalate leaching and precipitation is applied to recover cobalt and lithium from spent lithium-ion batteries. Oxalate is introduced as leaching reagent meanwhile as precipitant which leaches and precipitates cobalt from LiCoO(2) and CoO directly as CoC(2)O(4)·2H(2)O with 1.0 M oxalate solution at 80°C and solid/liquid ratio of 50 g L(-1) for 120 min. The reaction efficiency of more than 98% of LiCoO(2) can be achieved and cobalt and lithium can also be separated efficiently during the hydrometallurgical process. The combined process is simple and adequate for the recovery of valuable metals from spent lithium-ion batteries.
含有大量钴和锂等战略资源的废旧锂离子电池被认为是一种有吸引力的二次资源。在这项工作中，采用了一种基于真空热解、草酸盐浸出和沉淀的环保兼容工艺，从废旧锂离子电池中回收钴和锂。草酸盐不仅被用作浸出试剂，还被用作沉淀剂，可在 80°C、固液比为 50 g·L(-1)、1.0 M 草酸盐溶液条件下，直接将 LiCoO(2)和 CoO 中的钴浸出并沉淀为 CoC(2)O(4)·2H(2)O，120 min 内的反应效率超过 98%。在湿法冶金过程中，钴和锂也能被高效分离。该联合工艺简单，适用于从废旧锂离子电池中回收有价值的金属。
