Department of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran.
Department of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran.
Chemosphere. 2020 Sep;254:126670. doi: 10.1016/j.chemosphere.2020.126670. Epub 2020 Apr 8.
Ultrasound-assisted bioacid leaching was examined for the extraction of valuable metals from spent lithium ion batteries (LIBs). In this work, organic acids in lemon juice were used as the leaching agent together with HO. Three effective factors, namely solid/liquid (S/L) ratio, lemon juice percentage, and HO volume percentage, were optimized using Response Surface Methodology (RSM). The optimal conditions were found to be 0.98% (w/v) S/L ratio, 57.8% (v/v) lemon juice and 8.07% (v/v) HO in the leaching liquor, achieving recovery of 100% Li, 96% Co and 96% Ni. Furthermore, the individual effects of ultrasound, HO and lemon juice on metal recovery were studied and the results showed that without HO or lemon juice, the metal recovery rates decreased greatly while the absence of ultrasound reduced recovery rates to a much smaller extent, indicating that both HO and lemon juice were essential in the leaching process. The effect of time on the metals recoveries was examined and results showed that Li and Co recovery reached 100% with the leaching time of 35 min. The modified shrinking core modeling results suggested that chemical reaction was the rate controlling step.
超声辅助生物酸浸法从废锂离子电池（LIBs）中提取有价金属。在这项工作中，柠檬汁中的有机酸与 HO 一起用作浸出剂。使用响应面法（RSM）优化了三个有效因素，即固液（S/L）比、柠檬汁百分比和 HO 体积百分比。发现最佳条件为浸出液中 S/L 比为 0.98%（w/v），柠檬汁为 57.8%（v/v），HO 为 8.07%（v/v），可实现 Li、Co 和 Ni 的回收率分别为 100%、96%和 96%。此外，还研究了超声、HO 和柠檬汁对金属回收率的单独影响，结果表明，没有 HO 或柠檬汁，金属回收率大大降低，而没有超声，回收率降低的程度要小得多，表明 HO 和柠檬汁在浸出过程中都是必不可少的。考察了时间对金属回收率的影响，结果表明，浸出时间为 35 min 时，Li 和 Co 的回收率达到 100%。改进的收缩核模型结果表明，化学反应是控制步骤。
