Selective recovery of rare earth elements from ion-adsorption rare earth element ores by stepwise extraction with HEH(EHP) and HDEHP

Huang, Xiaowei; Dong, Jinshi; Wang, Liangshi; Feng, Zongyu; Xue, Qiannan; Meng, Xianglong

doi:10.1039/c6gc03388a

Cited by 116 publications

(49 citation statements)

References 20 publications

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“…Globally, our results are in agreement with the literature. 36,70,71 At low m (HNO 3 ) aq,eq the extraction is high, whereas it decreases upon an increase of m (HNO 3 ) aq,eq . Within our model, this property is reflected in the − N L – ln(10)(p K a ° – pH) energy term (eq 36).…”

Section: Resultsmentioning

confidence: 99%

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

et al. 2019

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We propose the statistical thermodynamic model for the prediction of the liquid–liquid extraction efficiency in the case of rare-earth metal cations using the common bis(2-ethyl-hexyl)phosphoric acid (HDEHP) extractant. In this soft matter-based approach, the solutes are modeled as colloids. The leading terms in free-energy representation account for: the complexation, the formation of a highly curved extractant film, lateral interactions between the different extractant head groups in the film, configurational entropy of ions and water molecules, the dimerization, and the acidity of the HDEHP extractant. We provided a full framework for the multicomponent study of extraction systems. By taking into account these different contributions, we are able to establish the relation between the extraction and general complexation at any pH in the system. This further allowed us to rationalize the well-defined optimum in the extraction engineering design. Calculations show that there are multiple extraction regimes even in the case of lanthanide/acid system only. Each of these regimes is controlled by the formation of different species in the solvent phase, ranging from multiple metal cation-filled aggregates (at the low acid concentrations in the aqueous phase), to the pure acid-filled aggregates (at the high acid concentrations in the aqueous phase). These results are contrary to a long-standing opinion that liquid–liquid extraction can be modeled with only a few species. Therefore, a traditional multiple equilibria approach is abandoned in favor of polydisperse spherical aggregate formations, which are in dynamic equilibrium.

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Section: Resultsmentioning

confidence: 99%

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

et al. 2019

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“…For more dilute solutions, these processes are not competitive. The impregnation of solid porous supports with extractant offers interesting alternative to solvent extraction (Huang et al, 2017;Rahmani-Sani et al, 2015;Zayed et al, 2015). Indeed, the process allows maintaining the high efficiency and selectivity of solvent extraction while confining the solvent phase into the porosity of the support and preventing its loss and dispersion in the aqueous phase.…”

Section: Introductionmentioning

confidence: 99%

A new route for manufacturing poly(aminophosphonic)-functionalized poly(glycidyl methacrylate)-magnetic nanocomposite - Application to uranium sorption from ore leachate

Galhoum

Eisa

Elsayed

et al. 2020

Environmental Pollution

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A high-energy ball milling of magnetite nanoparticles with amino-phosphonic functionalized poly(glycidyl methacrylate) polymer is used for manufacturing a highly efficient magnetic sorbent for U(VI) sorption from aqueous solutions. The Uranyl ions were adsorbed through the binding with amine and phosphonic groups as confirmed by Fourier Transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses. The maximum sorption capacity (up to 270 mg U g À1) occurred at pH ¼ 3e4; Langmuir isotherm well describes the sorption process. Small-size particles allow achieving fast uptake (within z90 min of contact); and the kinetic profiles are modeled by the pseudo-second order rate equation. Uranium is successfully desorbed from loaded sorbent using 0.25 M NaHCO 3 solution: Sorbent can be recycled with minimal decrease in sorption and desorption efficiency for at least 6 cycles. The sorbent is efficiently used for U(VI) recovery from the acidic leachates of U-bearing ores (after precipitation pre-treatment). Sorption capacity approaches 190 mg U g À1 despite the presence of high concentrations of Fe and Si: the sorbent has a marked preference for U(VI) (confirmed by distribution ratios and selectivity coefficients).

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“…The α-aminophosphonate-based compounds are among the most useful organophosphorus derivatives; they have attracted increasing attention because of their biological properties and potential applications in pharmacological and agrochemical fields [20,21]. These organophosphorus compounds and their derivatives are also known as good metal-complexing agents for various transition metals in diagnostic and therapeutic applications [22], but also as industrial chemicals in water treatment, metal extraction, or pollution control [23][24][25], by analogy with synthetic resins [26] and liquid/liquid extractants [27][28][29]. Recently, the affinity of phosphate groups for uranium has been used for elaborating an inorganic/organic composite (based on the simple and readily encapsulation of microparticles of a mineral rock with chitosan) [30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polyaminophosphonic acid-functionalized poly(glycidyl methacrylate) for the efficient sorption of La(III) and Y(III)

Galhoum

Elshehy

Tolan

et al. 2019

Chemical Engineering Journal

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Selective recovery of rare earth elements from ion-adsorption rare earth element ores by stepwise extraction with HEH(EHP) and HDEHP

Abstract: Ion-adsorption rare earth element (REE) ores are strategic mineral resources, particularly for heavy REEs.

Cited by 116 publications

References 20 publications

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

A new route for manufacturing poly(aminophosphonic)-functionalized poly(glycidyl methacrylate)-magnetic nanocomposite - Application to uranium sorption from ore leachate

Synthesis of polyaminophosphonic acid-functionalized poly(glycidyl methacrylate) for the efficient sorption of La(III) and Y(III)

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