School of Metallurgy and Environment, Central South University, Changsha 410083, China.
School of Metallurgy and Environment, Central South University, Changsha 410083, China; Changsha Engineering and Research Institute Ltd. of Nonferrous Metallurgy, Changsha 410019, China.
J Hazard Mater. 2021 Sep 5;417:126032. doi: 10.1016/j.jhazmat.2021.126032. Epub 2021 May 9.
In this study, antibiotic bacteria residues (ABRs) is proposed as a novel green reducing agent and it is found that the reducing agent can realize the efficient recovery of the valuable metals in spent cathode powder (SCP), reduce the environmental pollution and realize the high-value utilization of the biomass waste. The leaching efficiency of Ni, Co, Mn and Li can reach 99.57%, 98.50%, 98.99% and 99.90% respectively under the optimal conditions of 3 mol L HSO, mass ratio of ABRs to SCP of 0.8:1, liquid/solid ratio of 30:1 mL g, the temperature of 363 K and time of 2.5 h. Leaching kinetics results shows that the reaction process is controlled by the chemical reaction with apparent activation energy exceeding than 40 kJ/mol. More importantly, the detailed ABRs leaching mechanism is proposed that the metabolite of CaCO and reducing sugar in ABRs provide a synergistic reduction effect on the recovery of valuable metals. Furthermore, acid leaching residue can be regenerated to obtain lithium-ion anode materials with excellent electrochemical properties. The entire process is a sustainable green recycling strategy by using waste ABRs waste to treat spent lithium-ion batteries (LIBs), recovering valuable metals efficiently and minimizing environmental pollution.
在这项研究中，抗生素细菌残留（ABRs）被提议作为一种新型绿色还原剂，研究发现该还原剂可以实现废阴极粉（SCP）中有价金属的高效回收，减少环境污染，并实现生物质废物的高值利用。在最佳条件下（3 mol/L HSO、ABRs 与 SCP 的质量比为 0.8:1、液固比为 30:1 mL/g、温度为 363 K 和时间为 2.5 h），Ni、Co、Mn 和 Li 的浸出效率分别达到 99.57%、98.50%、98.99%和 99.90%。浸出动力学结果表明，反应过程受化学反应控制，表观活化能超过 40 kJ/mol。更重要的是，提出了详细的 ABRs 浸出机理，即 ABRs 中 CaCO 的代谢物和还原糖对有价金属的回收具有协同还原作用。此外，酸浸残渣可以再生，得到具有优异电化学性能的锂离子电池正极材料。整个过程是一种可持续的绿色回收策略，利用废物 ABRs 处理废锂离子电池（LIBs），高效回收有价金属，最大限度地减少环境污染。
