Hydrometallurgical recycling of valuable metals from spent lithium-ion batteries by reductive leaching with stannous chloride

• 作者: Liu-ye Sun Bo-rui Liu Tong Wu Guan-ge Wang Qing Huang Yue-feng Su Feng Wu
• 来源期刊: 矿物冶金与材料学报
• 年，卷（期）: 2021,（6）
• 页码范围: 991-1000
• 页数: 10页
• 语种: 英文

摘要

The reductant is a critical factor in the hydrometallurgical recycling of valuable metals from spent lithium-ion batteries (LIBs). There is limited information regarding the use of SnCl2 as a reductant with organic acid (maleic acid) for recovering valuable metals from spent Li-CoO2 material. In this study, the leaching efficiencies of Li and Co with 1 mol·L?1 of maleic acid and 0.3 mol·L?1 of SnCl2 were found to be 98.67％ and 97.5％, respectively, at 60℃ and a reaction time of 40 min. We investigated the kinetics and thermodynamics of the leaching pro-cess in this study to better understand the mechanism of the leaching process. Based on a comparison with H2O2 with respect to leaching effi-ciency, the optimal leaching parameters, and the activation energy, we determined that it is feasible to replace H2O2 with SnCl2 as a leaching re-ductant in the leaching process. In addition, when SnCl2 is used in the acid-leaching process, Sn residue in the leachate may have a positive ef-fect on the re-synthesis of nickel-rich cathode materials. Therefore, the results of this study provide a potential direction for the selection of re-ductants in the hydrometallurgical recovery of valuable metals from spent LIBs.