生物淋滤溶出废旧锂离子电池中钴的研究

Study on the Release of Co from Retrieved Li-Ion Batteries by Bioleaching

摘要: 考察不同培养条件对生物淋滤溶出钴的影响,研究提高钴生物溶出效率的方法和工艺条件.研究表明:在硫磺质量浓度为4 g/L,起始pH为2.0,培养温度为27℃时,当电极混合材料的质量浓度为1%的条件下,淋滤12 d后钴的溶出质量浓度可达306 mg/L.降低淋滤体系起始酸度(pH为1.0)和改变淋滤液硫源组合(2 g/L硫磺和2 g/L黄铁矿)可以有效提高钴的生物溶出效率,淋滤12 d后钴的溶出质量浓度高达1 682 mg/L,溶出率超过90%.

Abstract: Influence of various conditions on the removal efficiency was investigated;especially the method to improve removal efficiency was studied.The results showed that when the concentration of sulfur was 4g/L,the initial pH was 2.0,the culture temperature 27℃,the batteries dose 1%,and the released concentration of Co after 12d bioleaching was 306mg/L.Decrease in initial pH and change in S sources greatly improved the bioleaching of Co,the released concentration of Co was 1682mg/L and the removal efficiency over 90% after 12d.