Solvent extraction and separation of light rare earth elements (La, Pr and Nd) in the presence of lactic acid as a complexing agent by Cyanex 272 in kerosene and the effect of citric acid, acetic acid and Titriplex III as auxiliary agents

Kashi, Eslam; Habibpour, Razieh; Gorzin, Hesamoddin; Maleki, Armin

doi:10.1016/j.jre.2017.09.016

Cited by 51 publications

(19 citation statements)

References 18 publications

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“…Several other compounds have been tested, such as citric acid, acetic acid, ethylenediamine tetraacetic acid (EDTA), etc. to name a few (Kashi et al, 2018).…”

Section: Solvent Extractionmentioning

confidence: 99%

Recycling spent fluid cracking catalysts for rare earth metal recovery: A review

Sadeghi¹,

Jesus²,

Soares³

2018

Recyc & Sust Dev

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“…Several other compounds have been tested, such as citric acid, acetic acid, ethylenediamine tetraacetic acid (EDTA), etc. to name a few (Kashi et al, 2018).…”

Section: Solvent Extractionmentioning

confidence: 99%

Recycling spent fluid cracking catalysts for rare earth metal recovery: A review

Sadeghi¹,

Jesus²,

Soares³

2018

Recyc & Sust Dev

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“…Leaching remains the most frequently technique used for the processing of ores or waste materials [ 7 ]. Several alternatives exist for the recovery of REEs from leachates including solvent extraction [ 13 , 14 , 15 ] and impregnated resin [ 16 ]. However, most of the studies focus on sorption processes involving ion-exchange [ 17 ] or chelating resins [ 18 , 19 , 20 ], graphene-based sorbents, [ 21 ] carbon [ 22 ], clays, [ 23 ] functionalized silica [ 24 , 25 ], extractant impregnated layered double hydroxide [ 26 ], and functionalized bioadsorbent polymers [ 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO2 Composite

et al. 2021

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The strong demand for rare-earth elements (REEs) is driven by their wide use in high-tech devices. New processes have to be developed for valorizing low-grade ores or alternative metal sources (such as wastes and spent materials). The present work contributed to the development of new sorbents for the recovery of rare earth ions from aqueous solutions. Functionalized mesoporous silica composite was synthesized by grafting diethylenetriamine onto composite support. The physical and chemical properties of the new sorbent are characterized using BET, TGA, elemental analysis, titration, FTIR, and XPS spectroscopies to identify the reactive groups (amine groups: 3.25 mmol N g−1 and 3.41 by EA and titration, respectively) and their mode of interaction with Nd(III) and Gd(III). The sorption capacity at the optimum pH (i.e., 4) reaches 0.9 mmol Nd g−1 and 1 mmol Gd g−1. Uptake kinetics are modeled by the pseudo-first-order rate equation (equilibrium time: 30–40 min). At pH close to 4–5, the sorbent shows high selectivity for rare-earth elements against alkali-earth elements. This selectivity is confirmed by the efficient recovery of REEs from acidic leachates of gibbsite ore. After elution (using 0.5 M HCl solutions), selective precipitation (using oxalate solutions), and calcination, pure rare earth oxides were obtained. The sorbent shows promising perspective due to its high and fast sorption properties for REEs, good recycling, and high selectivity.

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“…Many scholars have recently investigated solvent extraction for the extraction of neodymium. [14][15][16] In these researches, different extractants, including amines, [17] phosphonic acid, [18] phosphonic acids, [19] neutral extractants, [20] and chelated extractants [21] have been utilized for the extraction of neodymium from various aqueous solutions. For example, the extraction of neodymium from thiocyanate medium using Cyanex 921 in kerosene was reported by El-Hefny.…”

Section: Introductionmentioning

confidence: 99%

Synergistic solvent extraction of neodymium form nitric acid medium using Cyanex 302 and D2EHPA

Allahkarami

Rezai

Bozorgmehr

et al. 2021

Zeitschrift anorg allge chemie

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In this research, a binary mixture of Cyanex 302 (bis-2,4,4 trimethylpentyl monothiophosphinic acid) and D2EHPA (di-2ethylhexyl phosphoric acid) in kerosene was used for extracting neodymium from nitric acid medium. The different variables affecting the extraction of Nd(III) such as contact time, solution acidity, extractant concentration, and temperature were investigated. Stripping of neodymium ions from the loaded organic phase using HCl, HNO3, and H 2 SO 4 for the re-extraction of neodymium was also carried out. Results indicated that the most efficient reagent for the stripping of neodymium was nitric acid. The extraction reaction of neodymium with the synergistic mixture was determined using graphical method to be NdH 5 A 2 B 6 . The organo-metallic complex containing neodymium was examined by Fourier Transform Infrared Spectroscopy (FT-IR). The values of stoichiometric coefficients and thermodynamic parameters were calculated for this mixture. The extraction was an endothermic process, and the thermodynamic functions, ΔH and ΔS were determined to be 10.532 kJ/ mol and À 123.681 j/mol°K, respectively for the system under study. The Cyanex 302 + D2EHPA system not only increased the extraction efficiency of neodymium but also improved the selectivity significantly. The separation factor of neodymium and praseodymium suggested that this mixture would be of practical value in the separation of neodymium.

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Solvent extraction and separation of light rare earth elements (La, Pr and Nd) in the presence of lactic acid as a complexing agent by Cyanex 272 in kerosene and the effect of citric acid, acetic acid and Titriplex III as auxiliary agents

Cited by 51 publications

References 18 publications

Recycling spent fluid cracking catalysts for rare earth metal recovery: A review

Recycling spent fluid cracking catalysts for rare earth metal recovery: A review

Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO2 Composite

Synergistic solvent extraction of neodymium form nitric acid medium using Cyanex 302 and D2EHPA

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