One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets

doi:10.1016/j.seppur.2020.117362

	One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets
	Makarova, Irina 1; Ryl, Jacek 2; Sun, Zhi 3; Kurilo, Irina 4; Gornicka, Karolina 5; Laatikainen, Markku 1; Repo, Eveliina 1
刊名	SEPARATION AND PURIFICATION TECHNOLOGY
	2020-11-15
卷号	251 页码:9
关键词	Electrolysis Rare-earth elements NdFeB alloy Adsorption Oxalic acid
ISSN号	1383-5866
DOI	10.1016/j.seppur.2020.117362
英文摘要	Recovery of rare-earth elements (REEs) from spent NdFeB magnets is receiving great attention because of high amount of neodymium and potential risk of environmental pollution. In this study, a novel environment-friendly hydrometallurgical route is proposed for efficient recovery of REEs during electrochemical leaching with sulfuric and oxalic acids. With proper adjustment of the electrolyte composition and operating conditions, effective separation of different elements is observed; a compact layer of REE oxalates in a purity of up to 93% is obtained on the cathode, while iron remains in the solution and as solid residue for further recovery. The mechanisms during the electro-leaching process were subsequently investigated and we propose that cathodic deposition of the REEs is due to electrostatic attraction of the REE-oxalate particles on the cathode. With this finding, selective recovery of REEs from spent magnets can be achieved. This study provides a new insight on electronic waste recycling by implementing principles of electrochemistry.
资助项目	European Regional Development Fund[A74334]
WOS关键词	RARE-EARTH-ELEMENTS ; THERMAL-STABILITY ; XPS SPECTRA ; IRON ; COERCIVITY ; EXTRACTION ; NEODYMIUM ; METALS ; LIGHT ; FILMS
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000564728300007
资助机构	European Regional Development Fund
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/41890]
专题	中国科学院过程工程研究所
通讯作者	Makarova, Irina
作者单位	1.LUT Univ, Sch Engn Sci, Dept Separat Sci, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland 2.Gdansk Univ Technol, Dept Electrochem Corros & Mat Engn, Narutowicza Str 11-12, PL-80233 Gdansk, Poland 3.Chinese Acad Sci, Beijing Engn Res Ctr Proc Pollut Control, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 4.Belarussian State Technol Univ, Dept Analyt & Phys Chem, Sverdlova 13a Str, Minsk 220050, BELARUS 5.Gdansk Univ Technol, Dept Solid State Phys, Ul Narutowicza 11-12, PL-80233 Gdansk, Poland
推荐引用方式 GB/T 7714	Makarova, Irina,Ryl, Jacek,Sun, Zhi,et al. One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2020,251:9.
APA	Makarova, Irina.,Ryl, Jacek.,Sun, Zhi.,Kurilo, Irina.,Gornicka, Karolina.,...&Repo, Eveliina.(2020).One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets.SEPARATION AND PURIFICATION TECHNOLOGY,251,9.
MLA	Makarova, Irina,et al."One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets".SEPARATION AND PURIFICATION TECHNOLOGY 251(2020):9.