界面疏水改性强化废弃锂电材料浮选分离机制研究

Study on Flotation Separation Mechanism of Waste Lithium Electric Materials Enhanced by Interfacial Hydrophobic Modification

为实现废弃锂离子电池正、负极电极材料的有效分离,采用模拟正极材料和石墨分别代替废弃锂离子电池正极材料和负极材料,以邻苯二酚和高碘酸钠(CA-SP)制备一种新型浮选抑制剂,开展了正负极电极材料浮选试验。采用X射线光电子能谱(XPS)、紫外光谱(UV-vis)分析进行表征,研究了邻苯二酚(CA)-高碘酸钠(SP)在聚偏氟乙烯(PVDF)、钴酸锂(LiCoO2)和石墨表面的吸附机理。通过浮选试验验证了正负极材料经CA-SP沉积液改性后的浮选性能。结果表明,通过浮选可获得品位为83%的富钴精矿,且回收率达到90%,证明CA-SP为一种有效的正极材料抑制剂,具有成本低、环境友好等优点,在工业电池回收中具有较好的推广价值。

In order to achieve effective separation of positive and negative electrode materials in waste lithium-ion batteries,flotation tests were conducted on positive and negative electrode materials by taking simulated cathode materials and graphite to replace the cathode materials and anode materials of waste lithium-ion batteries.A new flotation inhibitor was prepared using catechol and sodium periodate(CA-SP).X-ray photoelectron spectroscopy(XPS)and ultraviolet spectroscopy(UV-vis)were used to characterize the adsorption mechanism of catechol(CA)-sodium periodate(SP)on polyvinylidene fluoride(PVDF),lithium cobalt oxide(LiCoO,),and graphite surfaces.The flotation performance of positive and negative electrode materials modified by CA-SP deposition solution was verified by flotation experiments.The results show that cobalt rich concentrate with a grade of 90%and a recovery rate of 83%can be obtained through flotation,proving that CA-SP is an effective cathode material inhibitor with advantages such as low cost and environmental friendliness,and has a good promotion value in industrial batteryrecovery.