A Fundamental Study on Recycling of Rare Earth magnet Scrap

考虑到有色二次金属资源的稳定供应，有色二次金属的回收利用具有重要意义。选矿和冶金中的各种分离方法一般适用于有色二次金属的回收。稀土磁铁具有良好的性能，目前已生产出两种类型的稀土磁铁作为工业品。一种是钐钴磁铁，另一种是钕铁硼磁铁。日本没有稀土资源。因此，从废稀土磁体中回收稀土元素具有十分重要的意义。试验了氧化焙烧、浸出、溶剂萃取等多种冶金处理方法，开发了从混合稀土磁体废料中回收Sm、Nd、Co、Cu等有色金属的工艺。研究结果为稀土磁体废料的处理提供了可行的方法。

Recycling of nonferrous secondary metals is thought to be important in view of the stable supply of the metal resources. Various separation methods in mineral processing and metallurgy are generally applicable to the recycling of nonferrous secondary metals.The rare earth magnet has a good performance, and now two types of rare earth magnet are produced as industrial products. One is Sm-Co magnet and the other is Nd-Fe-B magnet. There are not rare earth resources in Japan. Therefore, the recovery of rare earth elements from rare earth magnet scrap is very important.In the present study, various metallurgical processing methods, such as oxidizing roasting, leaching and solvent extraction, were tested to develop the recovery process of nonferrous metals, such as Sm, Nd, Co and Cu, from mixed rare earth magnet scrap.As the result of the study, a treatment process of rare earth magnet scrap could be proposed.