(1. 中國礦業(yè)大學(xué) 化工學(xué)院，徐州 221006；
2. 中國礦業(yè)大學(xué) 現(xiàn)代分析與計算中心，徐州 221006)
摘 要: 對比研究廢棄鋰離子電池富鈷破碎產(chǎn)物與商品化電極材料的浮選行為，并分析不同浮選行為的機(jī)理。結(jié)果表明：商品化鈷酸鋰和石墨的天然可浮性差異較大，將以質(zhì)量比1:1混合后的模擬物料進(jìn)行浮選，鈷品位由15.66%富集到50.71%；手工拆解廢棄鋰離子電池得到的鈷酸鋰顆粒和石墨顆粒表面粗糙，有雜質(zhì)附著，使得電極材料表面相關(guān)元素的含量降低，該雜質(zhì)為以C、F、P和O元素為主的有機(jī)物，使回收的鈷酸鋰和石墨顆粒表面化學(xué)組成相近，造成材料表面潤濕性發(fā)生改變；富鈷破碎產(chǎn)物經(jīng)浮選后，鈷品位由24.21%僅提高到28.08%。因此，浮選前必須對回收的富鈷破碎產(chǎn)物進(jìn)行表面改性，以增大鈷酸鋰和石墨表面潤濕性差異，從而使浮選獲得有效的分離。
關(guān)鍵字: 廢棄鋰離子電池；浮選；鈷酸鋰；石墨；資源化
（1. School of Chemical Engineering and Technology, China University of Mining and Technology,
Xuzhou 221006, China;
2. Advanced Analysis and Computation Center, China University of Mining and Technology, Xuzhou 221006, China）
Abstract:The floatation behaviors of Co-enriched crushed products and commercialized electrode materials were compared, and the mechanism caused different floatation behavior was analyzed. The results show that, because of a huge floatability difference between commercialized electrode materials, the flotation of simulation material, a mixture of LiCoO2 and graphite, achieve good enrichment, the product grade of Co increases from 15.66% to 50.71%. The organic impurity containing C, F, P and O covers on rough surface of recovered material obtained from disassembled spent lithium-ion batteries. The impurity leads to different surface properties including the content decrease of related elements, similar surface chemical composition of LiCoO2 with graphite, and cause the change of materials surface wettability. After the flotation of Co-enriched crushed products, the grade of Co increases from 24.21% to 28.08%. Therefore, the surface modification must be conducted to the recovered Co-enriched crushed products to enlarge the wettability differences before floatation. As a result, the efficient effect of floatation separation can be achieved.
Key words: spent lithium-ion batteries; floatation; LiCoO2; graphite; recycling
