Citation: Chuanying Liu, Qibin Yan, Xingwang Zhang, Lecheng Lei, Chengliang Xiao. A one-pot process based on P₄₄₄₁₄Cl-HCl aqueous biphasic system for recovering rare earth elements from NdFeB permanent magnet[J]. Chinese Chemical Letters, ;2022, 33(2): 953-956. doi: 10.1016/j.cclet.2021.07.026 shu

A one-pot process based on P₄₄₄₁₄Cl-HCl aqueous biphasic system for recovering rare earth elements from NdFeB permanent magnet

Chuanying Liu ^{a, b, 1} ,
Qibin Yan ^{a, 1} ,
Xingwang Zhang ^{a, b, 1} ,
Lecheng Lei ^{a, b} ,
Chengliang Xiao ^{a, b, *,}

a.
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
b.
Institute of Zhejiang University - Quzhou, Quzhou 324000, China

xiaoc@zju.edu.cn

Received Date: 17 April 2021
Revised Date: 18 May 2021
Accepted Date: 8 July 2021
Available Online: 14 July 2021

Figures(4)

Recovering critical metals from secondary resources have attracted great interest recently. In this work, a green one-pot leaching-extraction process based on tributyl(tetradecyl)phosphonium chloride (P₄₄₄₁₄Cl) aqueous biphasic system (ABS) was developed to efficiently recover rare earth elements (REEs) from NdFeB permanent magnet. The reaction process, phase separation mechanism, and operation conditions were thoroughly investigated. It is found that the P₄₄₄₁₄Cl-HCl ABS showed strong extraction ability towards Fe (> 99%) whereas only a few REEs (< 10%) were extracted, leading to extremely high separation selectivity between Fe and REEs. The characterization results showed that the coordination differences of Fe and Nd in HCl were the main driving forces for such highly selective separation. The phase diagram of P₄₄₄₁₄Cl-NdCl₃ ABS indicated that the salting-out effect of NdCl₃ was stronger than common chlorides. Due to the hydrophobic property of P₄₄₄₁₄[FeCl₄] and salting-out effect of NdCl₃, the P₄₄₄₁₄Cl could directly form ABS at room temperature after dissolving practical roasted NdFeB samples without any other operations and reagents. REEs and Fe could be mutually separated in just one step. Compared with traditional liquid-liquid extraction or ABS separation, this recovery process is green and facile and shows great application prospects in the field of rare-earth recovery.
- Rare earth,
- Ionic liquid,
- NdFeB permanent magnet,
- P₄₄₄₁₄Cl,
- Aqueous biphasic system
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通讯作者: 陈斌, bchen63@163.com

A one-pot process based on P₄₄₄₁₄Cl-HCl aqueous biphasic system for recovering rare earth elements from NdFeB permanent magnet