Recovering valuable metals from the leaching liquor of blended cathode material of spent lithium-ion battery
Recovering valuable metals from the leaching liquor of blended cathode material of spent lithium-ion battery
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从废旧锂离子电池混合正极材料浸出液中回收有价金属
DOI：
10.1016/j.jece.2020.104358
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发表时间：
2020-10
影响因子：
7.7
通讯作者：
Xu Shengming
中科院分区：
文献类型：
--
作者：
Yang Yue;Liu Fanhan;Song Shaole;Tang Honghu;Ding Shitian;Sun Wei;Lei Shuya;Xu Shengming
混合型锂离子电池正极材料在电动汽车上得到了广泛的应用，但由于混合型正极材料浸出液中锰含量高，难以有效回收其中的有价金属。本研究提出了一种从废旧混合正极材料高锰浸出液中回收有价金属的有效方法。首先，采用乙基黄原酸钠共沉淀高锰浸出液中97.5%的镍和100%的钴，最佳工艺条件为：pH=5，2 h，50 °C，乙基黄原酸钠用量为55 g. L-1。然后，在2 mol·L-1氨水、50 g·L-1硫酸铵、液固比8 ml·g-1、40 °C、1 h的条件下，通过两步氨浸，使沉淀中95%以上的镍选择性地浸出到溶液中，而几乎100%的钴仍留在沉淀中。最后用溶剂萃取法分离浸出液中的锰和锂。在体积分数为40%D2EHPA、pH=5、25 °C、有机水比（O：A）=1.25、萃取时间为10 min的条件下，锰与锂的萃取率可达99%以上。整个回收过程简单易行，可以有效地从废旧混合正极材料中回收锂、镍、钴和锰。
Blended cathode material for lithium-ion battery has been widely applied in electric vehicles, but effectively recovering valuable metals from the leaching liquor of blended cathode material is difficult due to the high content of manganese. In this study, an effective approach for recovering valuable metals from high-manganese leaching liquor of spent blended cathode materials is proposed. Firstly, 97.5% nickel and 100% cobalt in high-manganese leaching liquor are co-precipitated by sodium ethyl-xanthate under the optimum conditions of pH=5, 2 h, 50 °C and the dosage of sodium ethyl xanthate of 55 g·L-1. Then, over 95% nickel in precipitate is selectively leached into solution while almost 100% cobalt is still left in precipitate through a two-step ammonia leaching under the conditions of 2 mol·L-1ammonia, 50 g·L-1ammonium sulfate, L/S=8 ml·g-1, 1 h and 40 °C. Finally, the manganese and lithium left in leaching liquor are separated by solvent extraction. Over 99% manganese is effectively extracted and separated from lithium on the conditions of 40% vol D2EHPA, pH=5, 25 °C, the ratio of organic to aqueous (O:A)=1.25 and extraction time of 10 min. The whole recovering process is facile and can help effectively recycle lithium, nickel, cobalt and manganese from spent blended cathode materials.
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