Cyanex 272 and 8-HQ synergistic system for the extraction and recovery of Nd(III) from waste-NdFeB magnets

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-06-04 DOI:10.1016/j.hydromet.2025.106512

Jun Li , Ruihui Wu , Shengjun Tian , Ronghao Liu , Huiying Wei , Yanzhao Yang

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引用次数: 0

Abstract

The NdFeB magnets are the most widely used permanent magnetic materials in the international arena, and the recovery of Nd(III) from the growing number of waste-NdFeB magnets is becoming increasingly crucial. In this study, a novel synergistic extractant consisting of bis(2,4,4-trimethylpentyl) phosphonic acid (Cyanex 272) and 8-hydroxyquinoline (8-HQ) is proposed for the recovery of Nd(III) from waste-NdFeB magnets. First, the influence of the ratio of the two extractants on the synergistic extraction coefficient was investigated. The coextraction coefficient ratio of the two extractants Cyanex 272 and 8-HQ was 1:1. The extraction behaviors under different conditions, such as the extractant concentration, aqueous phase pH (pH = 5), and oscillation time (1 min), were investigated. Under optimal conditions, the extraction efficiency reached 99.6%. A chelating extraction mechanism was proposed on the basis of UV–vis spectroscopy, FT-IR spectroscopy, and NMR spectroscopy methods. The excellent extraction efficiency was maintained after five cycles of extraction and stripping, indicating the potential for application in light and heavy rare earth separation processes. Overall, this study aims to provide a new economically viable method for the recovery of Nd(III) from waste-NdFeB magnets.

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从废钕铁硼磁体中提取和回收Nd（III）的Cyanex 272和8-HQ协同体系

钕铁硼磁体是国际上应用最广泛的永磁材料，从越来越多的废钕铁硼磁体中回收Nd（III）变得越来越重要。本研究提出了一种由二（2,4,4-三甲基戊基）膦酸（Cyanex 272）和8-羟基喹啉（8-HQ）组成的新型协同萃取剂，用于从废钕铁硼磁体中回收Nd（III）。首先，研究了两种萃取剂配比对协同萃取系数的影响。两种萃取剂cyanex272和8-HQ的共萃取系数比为1:1。考察了萃取剂浓度、水相pH （pH = 5）、振荡时间（1 min）等条件下的萃取行为。在最佳条件下，提取效率达99.6%。通过紫外可见光谱、红外光谱和核磁共振光谱分析，提出了螯合萃取机理。经过5次萃取和汽提循环后，仍能保持较好的萃取效率，在轻、重稀土分离工艺中具有较大的应用潜力。总的来说，本研究旨在为从废钕铁硼磁体中回收Nd（III）提供一种新的经济可行的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.