从NdFeB磁体废料中回收稀土的工艺  

The industrial practice of recycling rare earth from NdFeB scraps

作　　者：刘志强[1] 陈怀杰[1] 

机构地区：[1]广州有色金属研究院稀有金属研究所,广东广州510650

出　　处：《材料研究与应用》2009年第2期134-137,共4页Materials Research and Application

摘　　要：采用硫酸溶解NdFeB磁体废料,在此溶液中添加无水硫酸钠使废料中的稀土形成稀土复盐与铁等大部分杂质分离.对稀土复盐进行碱转换生成稀土氢氧化物;用盐酸溶解稀土氢氧化物后采用非皂化P507进行萃取分离.研究结果表明,在分离高钕低镝稀土的过程中,与传统的皂化P507萃取相比,采用非皂化P507可以大大减少氨水和盐酸的用量,而且还可以减少乳化现象.采用本工艺制得了纯度大于99%的氧化钕、99.5%的氧化镝.A process for recycling rare earth from NbFeB scraps was introduced in this paper, the technical flow of which included the scraps being dissolved in sulphuric acid, followed by adding sodium sulphate to form rare earth double salt for separating rare earth from iron and other impurities, then adding sodium hydroxide to transform the salt to rare earth hydroxide and then the hydroxide being dissolved by hydrochloric acid, finally solvent extracting rare earth with non-saponification P507. The experimental results indicate that comparing with saponification, solvent extraction rare earth with non-saponification P507 can greatly reduce the amount of ammonia and hydrochloric acid, and also decrease emulsification during the process of separating rare earth with high Nd and low Dy. Dy2O3 with the purity of 99. 5M and 99% Nd2O3 are prepared.

关 键 词：NdFeB磁体废料 氧化钕 氧化镝 

分 类 号：TG146.4[一般工业技术—材料科学与工程]