摘要
随着新能源汽车工业的快速发展,废旧三元动力锂电池的量在不断地增加。三元动力锂电池中含有丰富的Co、Mn、Li和Ni资源,回收三元动力锂电池是防止环境污染和回收贵重金属的理想选择。利用抗坏血酸(C6H8O6)的酸性和还原性对废旧三元锂电池正极材料进行浸出,KMnO4的强氧化性回收浸出液中的Co制备β-CoC2O4·2H2O,采用浓度为1.3 mol·L^-1的C6H8O6,在60℃的条件下对正极材料浸出20 min,向浸出夜中加入1 mol·L^-1的H2SO4反应20 min后加入KMnO4继续反应1 h,制得β-CoC2O4·2H2O。实验结果表明,Co的回收率达91%,Li的浸出率可达96.4%,Mn和Ni完全浸出,可实现简单环保地浸出有价金属并回收Co。
With the rapid development of new energy automobile industry, the amount of waste ternary lithium batteries is continuously increasing. These batteries contained abundant resource of Co, Mn, Li and Ni.Therefore, recycling the ternary lithium battery is a good choice to prevent environmental pollution and recover precious metals. In this study, based on the acidic and reduction properties, ascorbic acid were used to leach the cathode materials of waste ternary lithium batteries. Then KMnO4 was used as oxidant to recovery the Co element in leaching solution and prepare β-CoC2O4·H2O. Cathode materials were leached with 1.3 mol·L^-1 ascorbic acid at 60 ℃ for 20 min, then 1 mol·L^-1 H2SO4 was added into the leaching solution and stir for 20 min.At last, KMnO4 was added and continued to react for 1h for β-CoC2O4·H2O preparation. The results showed that the Co recovery rate reached 91%, and the leaching rates of Mn, Ni and Li were 100%, 100% and 96.4%,respectively. Therefore, simple, environmentally and friendly leaching of valuable metals and recovery of Co element could be realized.
作者
高瑞
王继芬
GAO Rui;WANG Jifen(Research Center of Resource Recycling Science and Engineering,School of Science,College of Art and Science,Shanghai Polytechnic University,Shanghai 201209,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第2期506-514,共9页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51776116)
上海第二工业大学研究生基金项目(EGD18YJ0031)
上海市高原学科-环境科学与工程(资源循环科学与工程)。
