还原熔炼失效锂离子电池制备Co-Cu-Fe合金

Co-Cu-Fe alloy recycled from spent lithium ion batteries by reducing smelting process

为了从失效锂离子电池中高效回收有价金属,研究了用碳还原熔炼法回收失效锂离子电池的新方法.通过化学分析、X射线衍射、扫描电子显微镜和能谱分析等研究方法对熔炼锂离子电池得到的Co-Cu-Fe合金和熔渣进行了分析,实验结果表明,以碳为还原剂还原熔炼失效锂离子电池的方法是可行的,电池的主要有价金属能富集在Co-Cu-Fe合金中,电池中的铝箔可做为金属热还原剂还原钴氧化物.熔渣中仍有钴和铜以微小颗粒形式的机械夹杂,造成合金中有价金属的损失.减少熔渣中的金属夹杂损失、提高合金中钴和铜的回收率是今后研究中需要解决的关键问题.

To efficiently recycle valuable metals from spent lithium ion batteries,a new method of recycling spent lithium ion batteries by carbon reducing smelting process was studied.The Co-Cu-Fe alloy and slag smelted from lithium ion batteries were investigated by means of chemical analysis,XRD,SEM and EDS.Test results show that it is feasible to use carbon as reducing agent,and the main valuable metals can be gathered into Co-Cu-Fe alloy;furthermore,aluminum foils in lithium ion batteries can be used as metallic reducing agent to reduce cobalt oxides.Parts of cobalt and copper are still mechanically entrained in slag in the form of fine particles,which leads to the loss of valuable metal from alloy.The problems to be resolved are reducing the loss in the slag and increasing the recovery ratio of cobalt and copper in the alloy.The corrosion of lithium to alumina refractory materials can not be ignored as well.