有色金属科学与工程2024，Vol.15Issue(1)：130-138,9.DOI:10.13264/j.cnki.ysjskx.2024.01.016
钕铁硼油泥稀土和铁同步浸出与分步提取研究
Research on simultaneous leaching and stepwise extraction of rare earth and iron from NdFeB sludge
摘要
Abstract
NdFeB waste is a precious rare earth secondary resource,and its comprehensive and efficient recovery is of great practical significance for the sustainable development and recycling of rare earth.In this paper,with neodymium iron boron oil sludge as the research object,a new process of simultaneous leaching and step-by-step extraction of rare earth and iron from neodymium iron boron oil sludge was proposed by studying its processes of low-temperature oxidation roasting,hydrochloric acid leaching,oxalic acid precipitation of rare earth,and reduction precipitation of iron.The results show that at the optimal roasting temperature and leaching conditions,the leaching rates of rare earth and iron are respectively 98.80% and 98.41% ,a synchronous leaching being achieved.Under the optimal conditions of n(H2C2O4):n(RE3+)=3:1,precipitation temperature of 60℃ ,and precipitation time of 30min,the precipitation efficiency of rare earth elements is 98.43% ,the coprecipitation efficiency of iron is only 0.5% ,the oxalate rare earth products with purity of 98.34% are obtained,and the total recovery rate of rare earth is 97.24% ,realizing the selective separation of rare earth and iron.Under the optimum conditions of n(H2C2O4):n(Fe)=1.5:1,n(Fe):n(Fe3+)=1:1,precipitation temperature of 30℃ and precipitation time of 30min,the iron precipitation rate is 94.28% ,the ferrous oxalate products with purity of 99.22% is obtained,and the total iron recovery rate is 92.34% ,realizing the comprehensive recycling.Compared with the traditional NdFeB waste recycling process,this process has the advantages of a high comprehensive utilization rate of resources,and less amount of solid waste,providing a new idea for the comprehensive utilization of rare earth secondary resources.关键词
钕铁硼废料/同步浸出/稀土/铁/分步沉淀/综合回收Key words
NdFeB waste/simultaneous leaching/rare earth/iron/stepwise precipitation/comprehensive recovery分类
矿业与冶金引用本文复制引用
林辉阳,刘子帅,黎文庆,刘海平,唐学昆,周贺鹏,罗仙平..钕铁硼油泥稀土和铁同步浸出与分步提取研究[J].有色金属科学与工程,2024,15(1):130-138,9.基金项目
"十三五"国家重点研发计划资助项目(2020YFB1713700) （2020YFB1713700）
国家市场监管重点实验室(稀土产品检测与溯源)开放基金资助项目(TTREP2022YB02,TTREP2022ZD01) （稀土产品检测与溯源）
江西省教育厅青年基金资助项目(GJJ200845) （GJJ200845）
江西理工大学博士科研启动基金项目(205200100502) （205200100502）
大学生创新创业训练计划项目(DC2021-018) （DC2021-018）
