从报废锂离子电池粉碎料中分离正极材料与石墨的工艺研究

Process Research on Separating Cathode Material and Graphite from Crushed Material of Spent Lithium-ion Battery

提出一种从报废锂离子电池正负极混合料中通过优化有氧焙烧-浮选实验条件对正极材料回收的工艺。报废锂离子电池正负极混合料经过有氧焙烧后,通过采用ICP-OES、SEM分析其元素含量以及微观形貌的变化。研究结果表明:电极材料颗粒表面涂覆有机膜的分解和氧化利用有氧焙烧得到解决;利用正交试验对浮选分离进行分析,从而得到了其优化后的浮选分离条件为:料浆浓度8%、搅拌速度1600 r/min、药剂量50 g/t、pH值1、通气量0.1 m^(3)/h,得到正极材料的回收率为92.50%。

A process for recovering cathode materials from the anode and cathode mixtures of spent lithium-ion batteries by optimizing the experimental conditions of aerobic roasting-flotation was proposed.After aerobic roasting of the anode and cathode mixtures of spent lithium-ion batteries,the element content and micromorphology changes were analyzed by ICP-OES and SEM.The results show that the decomposition and oxidation of organic film coated on the surface of electrode material particles can be solved by aerobic roasting.The orthogonal tests are carried out to analyze the flotation separation and get the optimized flotation separation conditions as follows.With a slurry concentration of 8%,stirring speed of 1600 r/min,dosage of 50 g/t,pH value of 1.0,and ventilation volume of 0.1 m^(3)/h,the recovery of the cathode material obtained is 92.50%.