Solvent Extraction of Dy(III) and Nd(III) with an Unsymmetrical Pentanediamide Extractant,Industrial & Engineering Chemistry Research

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Solvent Extraction of Dy(III) and Nd(III) with an Unsymmetrical Pentanediamide Extractant
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-08-21 , DOI: 10.1021/acs.iecr.3c02108
Zhenfeng Xiong _{1,

2} , Ying Huang _{1,

2} , Nan Li _{1,

2} , Chaozhi Zhang ₃ , Yonghua Li ₄ , Zhuo Yang ₅ , Weidong Zhou ₆ , Kemei Zhou ₆ , Rong Zha _{1,

2} , Changdong Sheng _{1,

2}

Affiliation

Recovery of rare-earth elements (REEs), especially those of Dy and Nd, from Nd–Fe–B permanent magnets is crucial for sustainable development. Herein, an unsymmetrical pentanediamide extractant, N,N′-dimethyl-N,N′-didecyl-3-oxapentanediamide (DMDDOPDA), was synthesized and characterized for the effective extraction of Dy(III) and Nd(III). DMDDOPDA can form coordination bonds with metal ions because of the strong electron-donating abilities of the N and O atoms. The coordination sites might be inclined toward one side during the extraction. DMDDOPDA exhibited superior extraction performance in the HNO₃ system than it did in the HCl system. The highest extraction efficiencies of Dy(III) and Nd(III) under optimal conditions were 99.9% and 99.5%, respectively, while their optimum stripping efficiencies were 100% and 85.3%, respectively. DMDDOPDA extraction of Dy(III) and Nd(III) in the four investigated diluents involved the formation of a neutral coordination complex. This study provides new insights into REE extraction using pentanediamide extractants.

中文翻译：

使用不对称戊二酰胺萃取剂溶剂萃取 Dy(III) 和 Nd(III)

从 Nd-Fe-B 永磁体中回收稀土元素 (REE)，特别是镝和钕，对于可持续发展至关重要。本文合成了一种不对称戊二酰胺萃取剂N , N'-二甲基-N , N'-二癸基-3-氧杂戊二酰胺 (DMDDOPDA)，并对其进行了表征，可有效萃取 Dy(III) 和 Nd(III)。由于N和O原子具有很强的给电子能力，DMDDOPDA可以与金属离子形成配位键。在提取过程中，配位位点可能会向一侧倾斜。DMDDOPDA 在 HNO _{3中表现出优异的萃取性能}系统比 HCl 系统中的情况要好。最佳条件下Dy(III)和Nd(III)的最高萃取效率分别为99.9%和99.5%，最佳反萃效率分别为100%和85.3%。DMDDOPDA 在四种研究的稀释剂中萃取 Dy(III) 和 Nd(III) 涉及中性配位络合物的形成。这项研究为使用戊二酰胺萃取剂萃取稀土元素提供了新的见解。

更新日期：2023-08-21

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