Recovery of rare earth elements from permanent magnet scraps by pyrometallurgical process  

作　　者：Yu-Yang Bian Shu-Qiang Guo Yu-Ling Xu Kai Tang Xiong-Gang Lu Wei-Zhong Ding 

机构地区：[1]Shanghai Key Laboratory of Modern Metallurgy and Materials Processing,Shanghai University,Shanghai 200072,China [2]SINTEF Materials and Chemistry,7465 Trondheim,Norway

出　　处：《Rare Metals》2022年第5期1697-1702,共6页稀有金属（英文版）

基　　金：the National Key Basic Research Program of China(No.2012CB722805)。

摘　　要：In order to recover valuable rare earth elements from Nd-Fe-B permanent magnet scraps, a high-temperature pyrometallurgical process was developed in this work. The magnet scraps were first pulverized and oxidized at 1000℃ in normal atmosphere. The oxidized mixtures were then selectively reduced by carbon in the temperature range of 1400-1550℃. In this way, the rare earth elements were extracted to the form of oxides, whereas Fe and B were separated to metal phase. For improving the purity of rare earth oxides, the effects of temperature and reaction time on the reduction of B_(2)O_(3) in oxide phase were investigated. It is found that increasing reaction temperature and extending reaction time will help the reduction of B_(2)O_(3) contents in rare earth oxide phase. Almost all rare earth elements can be enriched in the oxide phase with the highest purity of 95 %.

关 键 词：Rare earth Permanent magnet RECYCLING 

分 类 号：TF845[冶金工程—有色金属冶金]