School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha, 410083, China.
School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha, 410083, China; Hunan Provincial Key Laboratory of Nonferrous Value-added Metallurgy, Changsha, 410083, China.
Chemosphere. 2023 Jan;312(Pt 1):137230. doi: 10.1016/j.chemosphere.2022.137230. Epub 2022 Nov 11.
Recycling valuable metals in spent LIBs is not only in line with the purpose of resource recycling but also an important measure for environmental protection. In this article, a process using biomass reduction roasting followed by a unique complexation-assisted ammonia leaching is proposed. Using waste areca powder (WAP) as a biomass reducing agent, the roasted residue is leached in an aqueous solution for the carbonate. The leaching efficiencies of Ni, Co, and Mn reach over 99% under ammonia leaching conditions of 1.5 M ammonium citrate (AC), 3 M ethylenediamine (EDA). The kinetics of ammonia leaching indicates the activation energies of Ni, Co, and Mn are 51.8 kJ mol, 47.7 kJ mol, and 40.8 kJ mol, respectively, which shows the whole duration is controlled by chemical reactions. Most importantly, this study systematically explores the mechanism of ammonia leaching and provided a useful recommendation for selecting the right ammonium salt.
从废旧 LIB 中回收有价值的金属不仅符合资源回收的目的，也是环境保护的重要措施。本文提出了一种采用生物质还原焙烧，然后采用独特的配位辅助氨浸的工艺。以废蒌叶粉（WAP）为生物质还原剂，在 1.5 M 柠檬酸铵（AC）和 3 M 乙二胺（EDA）的氨浸条件下，对焙烧残渣进行碳酸盐浸出。在氨浸条件下，Ni、Co 和 Mn 的浸出率均超过 99%。氨浸动力学表明，Ni、Co 和 Mn 的活化能分别为 51.8 kJ/mol、47.7 kJ/mol 和 40.8 kJ/mol，表明整个过程受化学反应控制。最重要的是，本研究系统地探讨了氨浸的机理，并为选择合适的铵盐提供了有益的建议。
