Localization of rare earth ions in an inhomogeneous magnetic field toward their magnetic separation  

作　　者：Barbara Fritzsche Zhe Lei Xuegeng Yang Kerstin Eckert 

机构地区：[1]TU Dresden,Institute of Process Engineering and Environmental Technology,01062,Dresden,Germany [2]Helmholtz-Zentrum Dresden-Rossendorf(HZDR),Institute of Fluid Dynamics,Bautzner Landstrasse 400,01328,Dresden,Germany

出　　处：《Journal of Rare Earths》2022年第10期1598-1605,共8页稀土学报（英文版）

基　　金：Project supported by the German Aerospace Center(DLR)with funds provided by The Federal Ministry for Economic Affairs and Climate Action(BMWi)due to an enactment of the German Bundestag under grant number 50WM1741(project SESIMAG II)。

摘　　要：Efficient extraction and recycling methods are an important issue for rare earth elements(REE). The significant differences in their magnetic moments make magnetic separation a promising step. Although the magnetic field gradient manipulation of ions seemed to be impossible, the robust enrichment of some paramagnetic RE ions was found in the vicinity of the magnet. The studies in recent years resolved the physical paradox of why, despite the Brownian motion of the ions, there is a reproducible enrichment of RE ions in magnetic field gradients. The existence of trigger process and energy barrier was proved.However, these studies usually used only high paramagnetic ions, e.g., Dy(Ⅲ) or Ho(Ⅲ). This work verifies the theory of the possible magnetic separation for 8 different rare earth ions, respectively. For this purpose, concentration distribution in rare earth chloride solutions were measured using a MachZehnder interferometer. The magnetic field was assured by a Halbach configuration to enhance the effect. The results show the classification of RE solutions into 2 classes: Class I contains the REs with low magnetic moment, whereas Class II includes the REs of high magnetic moment. Only the latter group shows the enrichment of ions in the vicinity of the magnet which encourages the implementation of magnetic separation into existing hydrometallurgical technology to enhance the selectivity of REE.

关 键 词：Magnetic separation Paramagnetic rare earth ions ENRICHMENT Halbach array INTERFEROMETRY Aqueous solution 

分 类 号：TF845[冶金工程—有色金属冶金]