Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran.
J Environ Manage. 2019 Apr 1;235:357-367. doi: 10.1016/j.jenvman.2019.01.086. Epub 2019 Jan 29.
The technology for recycling the spent coin cells is pressing needed due to a large amount of generated spent coin cells. However, there is little information about the recycling technology of spent coin cells. In this work, a two-step bioleaching method for recovery of metals from spent coin cells by Acidithiobacillus thiooxidans is performed for the first time. In this regard, the growth characteristics of A. thiooxidans was investigated in pure culture and during the two-step bioleaching approach. The highest recovery of Li, Co and Mn was achieved at a pulp density of 30 g L, in values of 99%, 60%, and 20%, respectively. The structural analyzes confirmed the progress of bioleaching process. In addition, the kinetics models showed that the chemical reaction was the rate-controlling step of the two-step bioleaching of spent coin cells. The comparative results between bioleaching and chemical leaching showed that Acidithiobacillus thiooxidans can enhance the leaching of metals. Toxicity characteristic leaching procedure of the spent coin cells powder demonstrated that the bioleached residue met the environmental limitations for safe disposal. In fact, bioleaching is an effective and promising route to reduce the environmental hazard of spent coin cells.
由于产生了大量的废硬币电池，因此迫切需要回收废硬币电池的技术。然而，关于废硬币电池的回收技术的信息却很少。在这项工作中，首次通过氧化硫硫杆菌对废硬币电池中的金属进行了两步生物浸出回收。在这方面，研究了氧化硫硫杆菌在纯培养和两步生物浸出过程中的生长特性。在纸浆密度为 30g/L 时，Li、Co 和 Mn 的最高回收率分别达到 99%、60%和 20%。结构分析证实了生物浸出过程的进展。此外，动力学模型表明，化学反应是两步生物浸出废硬币电池的速率控制步骤。生物浸出和化学浸出的比较结果表明，氧化硫硫杆菌可以增强金属的浸出。废硬币电池粉的毒性特征浸出程序表明，生物浸出残渣符合安全处置的环境限制。事实上，生物浸出是一种减少废硬币电池环境危害的有效且有前途的途径。
