Efficient and economical recovery of lithium, cobalt, nickel, manganese from cathode scrap of spent lithium-ion batteries

废品 浸出(土壤学) 烘烤 硫酸 阴极 无机化学 碱性电池 碳化作用 材料科学 冶金 化学 核化学 电极 电解质 土壤水分 有机化学 土壤科学 物理化学 环境科学
作者
Jialiang Zhang,Juntao Hu,Wenjuan Zhang,Yongqiang Chen,Chengyan Wang
出处
期刊:Journal of Cleaner Production [Elsevier BV]
卷期号:204: 437-446 被引量:199
标识
DOI:10.1016/j.jclepro.2018.09.033
摘要

A combined process was presented to recover valuable metals from lithium nickel cobalt manganese (NCM) cathodes of spent lithium-ion batteries. In this process, the cathode scrap was first roasted with carbonaceous reductant, and then carbonation water leaching was employed to selectively extract Li from the roasted cathodes. Finally, the obtained residue was leached in sulfuric acid solution to recover Co, Ni and Mn. A systematic investigation combining thermodynamic analysis, leaching experiments and characterization was conducted to explore the effect of operating conditions and leaching mechanism. The results indicate that the leaching of Li is significantly improved by injecting of CO2 into the leaching system, and more than 80% of Li can be leached within 10 min at a low liquid-solid ratio. High-quality Li2CO3 can be prepared from the leachate by direct evaporation. More than 96% of Ni, Co and Mn are extracted without adding reductant under the conditions of a H2SO4 dosage of 1.15 times the theoretical value, a time of 2.5 h, a temperature of 55 °C and a liquid-solid ratio of 3.5 mL g−1. The acid leaching process is more efficient and economical, which is ascribed to the transformation of the low-valence states of metals with high activity after reduction roasting.
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