氧化焙烧预处理对废旧磷酸铁锂电池负极材料回收的影响  

Effect of Oxidative Roasting Pretreatment on Recycling of Anode Materials from Spent Lithium Iron Phosphate Batteries

作　　者：李海森 阮丁山 张鹏 孟志远 周游 李强 LI Haisen;RUAN Dingshan;ZHANG Peng;MENG Zhiyuan;ZHOU You;LI Qiang(Guangdong Brunp Recycling Technology Co.,Ltd.,Foshan 528137,Guangdong,China)

机构地区：[1]广东邦普循环科技有限公司,广东佛山528137

出　　处：《矿冶工程》2024年第4期105-108,114,共5页Mining and Metallurgical Engineering

摘　　要：为了解决废旧磷酸铁锂电池粉中正、负极材料难浮选分离的问题,采用氧化焙烧预处理磷酸铁锂电池粉,再通过浮选分离磷酸铁锂正、负极材料。结果表明,与未预处理电池粉相比,磷酸铁锂电池粉经500℃氧化焙烧处理30 min后浮选所得负极石墨产品碳品位从47.63%提高至97.70%,正极产品中碳品位由24.00%降至1.01%,分选效果明显增强。未预处理的电池粉表面存在蛛网状长碳链有机物,使得电池正、负极材料发生粘连,浮选分离效果较差;通过氧化焙烧预处理,能有效消除正、负极材料上的长碳链有机物,增强正、负极材料间表面性质差异,强化浮选分离效率,实现废旧磷酸铁锂电池粉中石墨负极材料的回收。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 

分 类 号：X705[环境科学与工程—环境工程]