Separation of neodymium and dysprosium by solvent extraction using ionic liquids combined with neutral extractants: batch and mixer-settler experiments

Abstract

The combination of ionic liquids with Cyanex 923 improves the separation of Nd(iii) and Dy(iii).

Separation of precious metals by split-anion extraction using water-saturated ionic liquids

“…According to Hofmeister series, Br − or I − anions are more hydrophobic than Cl − and stabilize in the organic phase. [25][26][27][28] Therefore, the ionic liquids play essential roles of providing the anions Br − or I − that form complexes with the precious metals ions. The extraction mechanism involves two concomitant reactions.…”

“…Meanwhile, there is only a limited anion exchange of the different anions from one phase to the other to maintain electrical neutrality. [25][26][27][28] In this paper, a split-anion extraction process for the recovery of precious metals (i.e. Au(III), Pt(IV), Pd(II) and Rh(III)) from acidic chloride media using water-saturated ionic liquids is presented.…”

Extraction of neodymium(III) from aqueous solutions by solvent extraction with Cyanex® 572

“…The use of dilute acids can prevent from damaging to process equipment. Different extraction systems have been applied for the recovery of neodymium(III), such as organophosphorus acids (Banda et al, 2012;Bina Gupta et al, 2003;Kumari et al, 2019;Riaño et al, 2020), organophosphorus esters (Kao et al, 2006;Zhang et al, 2015), and high molecular weight amines (Lee and Son, 2017;Lu et al, 1989). The combination of Cyanex 272 with different amine extractants was investigated by Liu et al (Liu et al, 2014) for the extraction of praseodymium(III) and neodymium(III) from aqueous solution.…”

Chain Entanglement of 2-Ethylhexyl Hydrogen-2-Ethylhexylphosphonate into Methacrylate-Grafted Nonwoven Fabrics for Applications in Separation and Recovery of Dy (III) and Nd (III) from Aqueous Solution

“…For example, neodymium and dysprosium are key components of permanent magnets, such as NdFeB magnets. The demand for the separation and recovery of dysprosium and neodymium from used permanent magnets and scraps generated during manufacturing is increasing [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ].…”

“…The technology for the separation and recovery of dysprosium and neodymium from used permanent magnets has been extensively studied [ 21 , 22 ]. The most common method of recovering dysprosium and neodymium from waste materials involves leaching them in an acid solution and purifying the leached ions by solvent extraction [ 11 , 12 , 13 , 23 ]. Organophosphorus compounds such as 2-ethylhexyl hydrogen-2-ethylhexylphosphonate and di(2-ethylhexyl)phosphoric acid, carboxylic acid such as neodecanoic acid and naphthenic acid, and methyltrioctylamine chloride are usually used as extractants for rare-earth ions due to their good separation and recovery performance [ 22 , 23 , 24 , 25 , 26 ].…”