超声辅助生物淋滤废旧Zn-C电池锌锰溶出的研究

The release of Zn and Mn from spent Zn-C batteries by using ultrasoundassisted bioleaching

以氧化硫硫杆菌(A.thiooxidans)为淋滤菌株对废旧Zn-C电池电极材料中的Zn、Mn进行了生物浸提,比较研究了化学浸提、生物淋滤和不同超声辅助方法生物淋滤体系下的Zn、Mn的溶出效率及溶出动力学.结果表明:不同超声辅助方法中,超声+生物淋滤体系Zn、Mn溶出最优,Zn、Mn的最大溶出率分别为94.2%和65.5%,并提高了溶释速率.此外,对于Mn的溶出,化学淋滤体系符合边界层扩散控制模型,生物淋滤和超声+生物淋滤体系符合收缩核Stoke's regime模型,而Zn的溶出均符合化学反应控制模型.

In this study,A. thiooxidans was used for bioleaching Zn and Mn from the spent Zn-C batteries electrode materials. The release efficiency and dynamics of Zn and Mn among the chemical leaching,the biological leaching and the different ultrasound-assisted bioleaching systems were compared. The results show that ultrasound-assisted-bioleaching was optimal for the dissolution of Zn and Mn at different ultrasound-assisted systems,which was better than the biological leaching and chemical leaching systems. the optimal leaching rates of Zn and Mn in the spent Zn-C batteries reached to 94. 2% and61.5% respectively. In addition,dissolution kinetics studies show that the chemical reaction controlled model described best bioleaching behavior of Zn for all the systems,the Stoke’s regime model best described bioleaching behavior of Mn for the bioleaching and ultrasound-assisted-bioleaching systems and the diffusion controlled model was better than other models for the chemical leaching system.