微波辅助生物淋滤废旧碱性电池锌锰的溶出

Microwave assisted dissolution efficiency of bioleaching of spent alkaline zinc manganese battery

以氧化硫硫杆菌为淋滤菌株对废旧碱性电池电极材料中Zn、Mn进行生物淋滤,考察了生物淋滤、化学浸提和微波辅助处理对Zn、Mn浸出率的影响。实验结果表明,在能源底物单质硫浓度20 g/L、初始p H值1.0、淋滤培养温度35℃、固液比为1%条件下,经过9 d生物淋滤,微波辅助处理的生物淋滤体系Zn、Mn浸出率均达到49%左右,优于其他淋滤体系。溶出动力学研究表明,Zn的溶出动力学符合化学反应控制模型,Mn的溶出则表现较为复杂。此外,SEM-EDS、XRD分析可知,原样经过微波辐照,部分Zn Mn2O4分解为Mn O,促进了Mn的溶出。

In this study,Acidithiobacillus thiooxidans was used for bioleaching Zn / Mn in spent alkaline batteries electrode materials. The leaching efficiency of Zn and Mn among bioleaching,chemical extraction and microwave assisted bioleaching was studied. The results showed that both of the Zn and Mn leaching rates were reached about 49% in microwave assisted bioleaching after 9 days of bioleaching under the conditions of the concentration of elemental sulfur as the sole energy substrate of 20. 0 g / L,the initial p H of 1. 0,the culture temperature of 35℃ and the solid-liquid ratio of 1. 0%. The extraction efficiency of microwave assisted bioleaching was much higher than the other leaching systems. Dissolution kinetics studies showed that the bioleaching behavior of Zn is best described by the chemical reaction controlled model but Mn had the different controlled model at the different leaching progress. In addition,SEM-EDS and XRD analysis showed that the Zn Mn2O4 was broken down into Mn O by using microwave irradiation,promoting the dissolution of Mn.