废弃锂离子电池富钴破碎产物的可浮性

发布时间：2019-05-27 23:14

【摘要】：对比研究废弃锂离子电池富钴破碎产物与商品化电极材料的浮选行为,并分析不同浮选行为的机理。结果表明:商品化钴酸锂和石墨的天然可浮性差异较大,将以质量比1:1混合后的模拟物料进行浮选,钴品位由15.66%富集到50.71%;手工拆解废弃锂离子电池得到的钴酸锂颗粒和石墨颗粒表面粗糙,有杂质附着,使得电极材料表面相关元素的含量降低,该杂质为以C、F、P和O元素为主的有机物,使回收的钴酸锂和石墨颗粒表面化学组成相近,造成材料表面润湿性发生改变;富钴破碎产物经浮选后,钴品位由24.21%仅提高到28.08%。因此,浮选前必须对回收的富钴破碎产物进行表面改性,以增大钴酸锂和石墨表面润湿性差异,从而使浮选获得有效的分离。
[Abstract]:The flotation behavior of cobalt-rich broken products and commercial electrode materials for waste lithium-ion batteries was compared and studied, and the mechanism of different flotation behaviors was analyzed. The results show that the natural floatability of commercial lithium cobalt and graphite is quite different. The grade of cobalt is enriched from 15.66% to 50.71% when the simulated material mixed with mass ratio 1:1 is used for flotation. The surface of lithium cobalt and graphite particles obtained by manual dismantling of waste lithium ion batteries are rough and impurity attached, which reduces the content of related elements on the surface of electrode materials. The impurities are mainly C, F, P and O elements. The surface chemical composition of the recovered lithium cobalt and graphite particles is similar, resulting in a change in the surface wettability of the material. After flotation, the grade of cobalt increased only from 24.21% to 28.08%. Therefore, it is necessary to modify the surface of the recovered cobalt-rich broken products before flotation in order to increase the surface wettability difference between lithium cobalt acid and graphite, so that the flotation can be separated effectively.
【作者单位】：中国矿业大学化工学院;中国矿业大学现代分析与计算中心;
【基金】：上海电子废弃物资源化产学研合作开发中心开放基金项目(ZF1224-07)
【分类号】：TM912

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