微波辅助回收废旧三元锂电池中锰、钴、镍、锂试验研究

以混合酸抗坏血酸和葡萄糖酸作为浸出体系,辅以微波加热技术从废旧三元锂电池正极材料中浸出有价金属。采用N-N,二甲基吡咯烷酮(NMP)对废旧三元锂电池正极材料进行预处理,单因素试验确定了最佳条件为微波温度90℃、微波反应时间6 min、抗坏血酸浓度0.5 mol/L、葡萄糖酸浓度1 mol/L以及固液比20 g/L,获得对应Mn、Co、Ni、Li的最佳浸出率分别是99.5%、98.7%、99.7%、97.8%,并利用XRD、SEM和XPS对正极材料和不同条件下浸出后固体残留物进行表征分析。通过传统浸出与微波辅助浸出方法的对照,发现微波辅助浸出的效率更高。

Microwave recovery of valuable metals from used ternary lithium battery cathode materials

Using mixed acid ascorbic acid and gluconic acid as the leaching system, supplemented with microwave heating technology to leach valuable metals from used ternary lithium battery cathode materials. N-N,dimethylpyrrolidone (NMP) was used to pretreat the used ternary lithium battery cathode material. The optimum conditions were determined by a single-factor test to be a microwave temperature of 90 °C, a microwave reaction time of 6 min, an ascorbic acid concentration of 0.5 mol/L, a gluconic acid concentration of 1 mol/L and a solid-liquid ratio of 20 g/L.? The optimum leaching rates for Mn, Co, Ni and Li were obtained as follows 99.5%, 98.7%, 99.7% and 97.8%, respectively, and the solid residues after leaching were characterised using XRD, SEM and XPS for the anode materials and different conditions. By comparing the traditional leaching with the microwave-assisted leaching method, it was found that the microwave-assisted leaching was more efficient.