泡沫浮选法回收失效锂离子电池中的电极材料

发布时间：2018-05-06 06:06

  本文选题：废弃锂离子电池 + 浮选行为　； 参考：《有色金属(选矿部分)》2017年03期

【摘要】：失效锂离子电池破碎后,电极材料钴酸锂和石墨主要富集在-250μm粒级破碎产物中。纯钴酸锂和石墨具有相反的表面润湿性,因而泡沫浮选是一种较为理想的方法,可以实现钴酸锂和石墨的分离回收。然而电极材料颗粒表面被聚偏氟乙烯覆盖,严重影响实际浮选效果。本文主要研究聚偏氟乙烯对电极材料浮选行为的影响。结果表明,聚偏氟乙烯有机层包裹在钴酸锂和石墨表面,造成浮选的困难。因此,首先通过焙烧去除有机层。热重曲线结果表明,焙烧温度660℃,停留时间2 h条件下,聚偏氟乙烯可以被完全去除。有机层去除后,在矿浆浓度为10%,p H值为5,捕收剂用量为0.2 kg/t,起泡剂用量为0.25 kg/t,通过浮选可以回收钴酸锂的品位超过92%,回收率达到93%。
[Abstract]:After the broken lithium ion battery, the electrode materials, lithium cobalt and graphite, are mainly enriched in -250 渭 m particle crushing products. Pure lithium cobalt acid and graphite have opposite surface wettability, so foam flotation is an ideal method to realize the separation and recovery of lithium cobalt and graphite. However, polyvinylidene fluoride (PVDF) covers the particle surface of electrode material, which seriously affects the actual flotation effect. The effect of polyvinylidene fluoride (PVDF) on the flotation behavior of electrode materials is studied in this paper. The results show that the polyvinylidene fluoride (PVDF) organic layer is encapsulated on the surface of lithium cobalt and graphite, which results in the difficulty of flotation. Therefore, the organic layer is first removed by roasting. The thermogravimetric curves showed that the polyvinylidene fluoride (PVDF) could be completely removed under the conditions of calcination temperature 660 鈩，

本文编号：1851099