摘要
以废旧锂电池正极粉为原料,在磁场条件下,采用硫酸-双氧水体系浸出正极粉中的钴,探讨了磁感应强度、磁化浸出时间和浸出温度对钴浸出率的影响。结果表明,在磁感应强度为230 mT磁场、浸出时间为100 min、反应温度为70℃、固液比为1:100(其中硫酸浓度为3 mol/L)条件下,加入3 mL/g H_(2)O_(2)进行试验,钴的浸出率达到99.61%,相比较未磁化同等条件下,钴的浸出率提高了6.02个百分点。同时在硫酸用量减少20%的情况下,磁场强化浸出可以提高钴的浸出率4.62个百分点。磁场强化浸出的机理是加快了氢离子的扩散速度以及促进双氧水对Co^(3+)的还原,从而提高了该浸出反应中钴的浸出率。
Using used lithium battery cathode powder as raw material,under the condition of a magnetic field,the cobalt in the cathode powder is leached by sulfuric acid-hydrogen peroxide system.The influence of magnetic induction intensity,magnetization leaching time and leaching temperature on the cobalt leaching rate are discussed.The results show that,in a magnetic field of 230 mT,the leaching time is 100 min,the reaction temperature is 70℃,and the solid-to-liquid ratio is 1:100(the sulfuric acid concentration is 3 mol/L),and 3 mL/g H_(2)O_(2) is added for the test.The leaching rate of cobalt reaches 99.61%.Compared with the same condition without magnetization,the leaching rate of cobalt is increased by 6.02 percentage point.At the same time,when the amount of sulfuric acid is reduced by 20%,magnetic field enhanced leaching can increase the leaching rate of cobalt by 4.62 percentage point.The mechanism of magnetic field-enhanced leaching is to accelerate the diffusion rate of hydrogen ions and promote the reduction of Co^(3+)by hydrogen peroxide,thereby increasing the leaching rate of cobalt in the leaching reaction.
作者
周文波
程晖
徐敏
朱照强
彭畅
王震
ZHOU Wenbo;CHENG Hui;XU Min;ZHU Zhaoqiang;PENG Chang;WANG Zhen(Hubei Provincial Key Laboratory of Efficient Utilization of Metallurgical Mineral Resources and Lumping, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China)
出处
《矿产保护与利用》
2021年第1期127-131,共5页
Conservation and Utilization of Mineral Resources
基金
省部共建耐火材料与冶金国家重点实验室青年基金项目(2018QN19)。
关键词
废旧锂电池
正极粉
磁化
钴
浸出率
used lithium battery
positive electrode powder
magnetization
cobalt
leaching rate
