Cathode and anode materials in spent lithium iron phosphate battery powder are difficult to be separated by flotation.In order to solve this problem,it was proposed that lithium iron phosphate battery powder was pretreated by oxidative roasting,and then subjected to a flotation process for seperation between the cathode and anode materials of lithium iron phosphate.The results show that after lithium iron phosphate battery powder is pretreated by oxidative roasting at 500 ℃ for 30 minutes,the subsequent flotation process can lead to the graphite-based anode material with carbon grade up from 47.63％to 97.70％,and the cathode material with carbon grade down from 24.00％to 1.01％,presenting a significant separation effect.In comparison,the battery powder without pretreatment has cobweb-like long carbon-chain organic matter on its surface,which causes adhesion between cathode and anode materials of batteries,resulting in poor separation effect by flotation.The pretreatment of oxidative roasting can effectively eliminate the long carbon-chain organic matter on those cathode and anode materials,thus enhancing the difference in surface properties between cathode and anode materials.As a result,the enhanced flotation separation effect makes graphite-based anode material recycled from spent lithium iron phosphate batteries.
关键词
废旧电池回收/磷酸铁锂/负极回收/氧化焙烧/表面改性/浮选/石墨负极
Key words
recycling of spent battery/lithium iron phosphate/recycling of anode material/oxidative roasting/surface modification/flotation/graphite-based anode material
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