Separation of yttrium from ion-adsorbed-rare-earth deposit leachates using N,N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA): Preliminary experimental and molecular dynamics simulation studies

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

Hydrometallurgy Pub Date : 2024-10-19 DOI:10.1016/j.hydromet.2024.106412

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Abstract

The separation of yttrium (Y) from heavy rare-earth elements (HREEs) is a major issue for ion-adsorbed rare-earth deposits. This study describes a new extraction system to develop efficient separation of Y from HREEs in a chloride medium using diglycolamic acid as the extractant. The extraction performance of N,N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA) for mixed REEs of an ion-adsorbed rare-earth deposit was investigated. The extraction order of the REEs in the HDEHDGA system followed a positive sequence, and the extraction behavior of Y resembled that of the middle REEs. Compared with naphthenic acid (NA) and sec-octylphenoxy acetic acid (CA12), HDEHDGA exhibited better separation performance for HREEs (Ho-Lu) and Y. The separation factors of Ho/Y, Er/Y, Tm/Y, Yb/Y, and Lu/Y in the Y-enriched solution were 4.41, 4.29, 3.77, 3.26, and 3.11, respectively. Combined slope analysis and electrospray ionization–high-resolution mass spectroscopy (ESI-HRMS) results identified cation exchange as the extraction mechanism of RE³⁺. Furthermore, the molecular dynamics simulation results provided new insights into the dynamic behaviors of Y³⁺ and Yb³⁺ extraction and revealed that the interaction of HDEHDGA with Yb³⁺ was stronger than that with Y³⁺. In addition, the loading capacity and recyclability of HDEHDGA were evaluated. This study highlights the potential of the HDEHDGA system for the separation of Y from HREEs.

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使用 N,N-二（2-乙基己基）二甘醇氨基甲酸（HDEHDGA）从离子吸附的稀土矿床浸出液中分离钇：初步实验和分子动力学模拟研究

从重稀土元素（HREEs）中分离钇（Y）是离子吸附稀土矿床的一个主要问题。本研究介绍了一种新的萃取系统，该系统以二甘醇肟酸为萃取剂，在氯化物介质中开发出了从 HREEs 中高效分离 Y 的方法。研究了 N,N-二（2-乙基己基）-二甘醇胺酸（HDEHDGA）对离子吸附稀土矿床中混合 REEs 的萃取性能。在 HDEHDGA 体系中，REEs 的萃取顺序为正序，Y 的萃取行为与中间 REEs 相似。与环烷酸（NA）和仲辛基苯氧乙酸（CA12）相比，HDEHDGA对HREEs（Ho-Lu）和Y具有更好的分离性能。Y富集溶液中Ho/Y、Er/Y、Tm/Y、Yb/Y和Lu/Y的分离因子分别为4.41、4.29、3.77、3.26和3.11。结合斜率分析和电喷雾电离高分辨质谱（ESI-HRMS）结果，确定阳离子交换是 RE3+ 的萃取机制。此外，分子动力学模拟结果为 Y3+ 和 Yb3+ 萃取的动态行为提供了新的见解，并发现 HDEHDGA 与 Yb3+ 的相互作用强于与 Y3+ 的相互作用。此外，还评估了 HDEHDGA 的负载能力和可回收性。这项研究凸显了 HDEHDGA 系统从 HREEs 中分离 Y 的潜力。

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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.