School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China.
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Waste Manag. 2020 Feb 1;102:131-138. doi: 10.1016/j.wasman.2019.09.044. Epub 2019 Oct 31.
A novel and efficient approach for stepwise recycling of valuable metals from Ni-rich cathode material is developed. First, the spent cathode materials are leached by HSO + HO solution. The leaching efficiencies of lithium, nickel, manganese and cobalt reach almost 100%, 100%, 94% and 100%, respectively, under the conditions of 2 M sulfuric acid, 0.97 M hydrogen peroxide, 10 ml·g liquid-solid ratio, 30 min and 80 °C. Then, manganese and cobalt are co-extracted from the leaching liquor with PC88A, while almost 99% nickel and 100% lithium remain in the raffinate followed by being separated from each other by solvent extraction with neodecanoic acid (Versatic 10). The results show that 98% manganese and over 90% cobalt are co-extracted at pH = 5, 30 vol% PC88A and volume ratio of oil to water (O:A) = 2:1, while 100% nickel is separated from lithium under the optimum extraction conditions of initial pH = 4, O:A = 1:3 and 30 vol% Versatic 10. Finally, cobalt and manganese in the strip liquor of co-extraction are separated by selective precipitation method. Over 90% manganese is separated from cobalt under the conditions of pH = 0.5, 0.076 M KMnO, 80 °C and 60 min.
开发了一种从富镍正极材料中分步回收有价金属的新颖高效方法。首先，用过的正极材料用 HSO 溶液浸出。在 2 M 硫酸、0.97 M 过氧化氢、10 ml·g 液固比、30 min 和 80°C 的条件下，锂、镍、锰和钴的浸出率分别达到近 100%、100%、94%和 100%。然后，PC88A 从浸出液中同时萃取锰和钴，而几乎 99%的镍和 100%的锂留在萃余液中，随后用正癸酸（Versatic 10）溶剂萃取将它们彼此分离。结果表明，在 pH=5、30% PC88A 和油对水体积比（O:A）=2:1 的条件下，98%的锰和超过 90%的钴被共萃取，而在初始 pH=4、O:A=1:3 和 30% Versatic 10 的最佳萃取条件下，100%的镍从锂中分离出来。最后，通过选择性沉淀法分离共萃取液中的钴和锰。在 pH=0.5、0.076 M KMnO、80°C 和 60 min 的条件下，超过 90%的锰从钴中分离出来。
