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An environmentally friendly electro-oxidative approach to recover valuable elements from NdFeB magnet waste
Venkatesan, Prakash1; Sun, Z. H. I.2; Sietsma, Jilt1; Yang, Yongxiang1
2018-01-31
发表期刊SEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
卷号191期号:00页码:384-391
摘要

In this manuscript, we demonstrate a room temperature electrochemical process for efficiently recycling NdFeB magnet waste. First, the magnet waste was completely leached with HCl and then, in-situ electrochemical oxidation was performed to selectively oxidize Fe(11) in the leachate to Fe(III). Finally, oxalic acid was added directly to the electro-oxidized leachate which selectively precipitated more than 98% of rare earth elements as rare-earth oxalates. The calcination of rare-earth oxalates produced mixed rare-earth oxides of 99.2% purity and a marketable Fe(III) solution as by-product. The electro-oxidized leachate was also subjected to an alternative neutralization route in which ammonium hydroxide was added to remove iron as ferric hydroxide. The iron free leachate with rare earth elements and cobalt was then subjected to oxalic acid precipitation treatment, which finally produced rare-earth oxides of 99.7% purity. Furthermore, a cobalt-rich solution was obtained in the end and electrowinning studies performed on the solution showed the feasibility of recovering pure metallic cobalt.

文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.seppur.2017.09.053
收录类别SCI
语种英语
关键词[WOS]Chloride Solution ; Ferric-chloride ; Acid ; Iron ; Neodymium ; Scrap ; Extraction ; Metals ; Electrodeposition ; Separation
WOS研究方向Engineering
WOS类目Engineering, Chemical
项目资助者European Community's Seventh Framework Programme ([FP7])(607411) ; CAS Pioneer Hundred Talents Program
WOS记录号WOS:000417664900044
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23459
专题研究所(批量导入)
通讯作者Venkatesan, Prakash; Sun, Z. H. I.
作者单位1.Delft Univ Technol, Dept Mat Sci & Engn, NL-2628 CD Delft, Netherlands
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714
Venkatesan, Prakash,Sun, Z. H. I.,Sietsma, Jilt,et al. An environmentally friendly electro-oxidative approach to recover valuable elements from NdFeB magnet waste[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2018,191(00):384-391.
APA Venkatesan, Prakash,Sun, Z. H. I.,Sietsma, Jilt,&Yang, Yongxiang.(2018).An environmentally friendly electro-oxidative approach to recover valuable elements from NdFeB magnet waste.SEPARATION AND PURIFICATION TECHNOLOGY,191(00),384-391.
MLA Venkatesan, Prakash,et al."An environmentally friendly electro-oxidative approach to recover valuable elements from NdFeB magnet waste".SEPARATION AND PURIFICATION TECHNOLOGY 191.00(2018):384-391.
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