多组分协同优先提锂工艺

Multi-component collaborative preferential extraction of lithium

从废旧的锂离子电池中提取有价金属并进行利用,对于环保和资源循环方面具有重要的意义。针对退役动力锂离子电池正极材料(主要成分为LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2))进行多组分协同优先提锂工艺研究。在正极材料、NaHSO_(4)、C、Na_(2)SO_(4)的质量比1.0∶0.8∶0.1∶0.8,焙烧温度600℃,焙烧时间60 min,水浸液固比25 ml∶1 g,水浸温度25℃,水浸时间40 min的条件下,用电感耦合等离子体发射光谱(ICP-OES)及XRD对溶液及滤渣中的Li、Ni、Co和Mn元素含量进行分析,得到Li元素浸出率达到99.8%,Ni、Co和Mn元素的浸出率分别为3.6%、0.5%和1.5%,优先提锂效果显著。将富锂溶液进一步制备得成Li 2CO 3产品,沉锂率达到90%,产品经检测,满足电池级碳酸锂行业标准。

It was of great significance for environmental protection and resource recycling to extract and utilize valuable metals from spent Li-ion battery.The multi-component collaborative preferential extraction of lithium from cathode material of retired power Li-ion battery(the main component was LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2))was studied.Under the following processing conditions such as the mass ratio of cathode material to NaHSO_(4)to carbon to Na_(2)SO_(4)of 1.0∶0.8∶0.1∶0.8,600℃roasting temperature,60 min roasting time,25 ml∶1 g liquid-solid ratio of water leaching,25℃water leaching temperature and 40 min water leaching time,the contents of Li,Ni,Co and Mn in solution and filter residue were analyzed by inductively coupled plasma-optical emission spectrometer(ICP-OES)and XRD.The leaching rate of Li was 99.8%,while the leaching rate of Ni,Co and Mn was 3.6%,0.5%and 1.5%respectively,the preferential extraction of lithium effect was significant.The lithium rich solution was further prepared to lithium carbonate product,the lithium deposition rate was 90%,the product had been tested to meet the industry standard of battery grade lithium carbonate.