Sorption in the chemistry of rare earth elements

Ehrlich, Gert; Лисичкин, Г. В.

doi:10.1134/s1070363217060196

Cited by 23 publications

(28 citation statements)

References 260 publications

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“…[ 4 ] Ion exchange separation of rare earth elements was used by Spedding and Powell to separate REEs from fission products obtained from nuclear reactors [ 5 – 7 ]. Sorption processes for the separation of rare earths have been reviewed in several articles [ 8 – 11 ]. Strongly acidic cation exchangers were the first artificial functional polymers used for the separation of REE ions, and they are resumed predominating in the fields of chemistry and chemical technology under consideration [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Sorption processes for the separation of rare earths have been reviewed in several articles [ 8 – 11 ]. Strongly acidic cation exchangers were the first artificial functional polymers used for the separation of REE ions, and they are resumed predominating in the fields of chemistry and chemical technology under consideration [ 11 ]. Styrene and divinylbenzene copolymers bearing SO 3 H group are utilized.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and equilibrium studies on the recovery of praseodymium (III), dysprosium (III) and yttrium (III) using acidic cation exchange resin

2022

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In this research, the possibility of using hydrogenated Dowex 50WX8 resin for the recovery and separation of Pr(III), Dy(III) and Y(III) from aqueous nitrate solutions were carried out. Dowex 50WX8 adsorbent was characterized before and after sorption of metal ions using Fourier-transform infrared spectroscopy (FT-IR), Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray Analysis (EDX) techniques. Sorption parameters were studied which included contact time, initial metal ion concentration, nitric acid concentration and adsorbent dose. The equilibrium time has been set at about 15.0 min. The experimental results showed that the sorption efficiency of metal ions under the investigated conditions decreased with increasing nitric acid concentration from 0.50 to 3.0 M. The maximum sorption capacity was found to be 30.0, 50.0 and 60.0 mg/g for Pr(III), DY(III) and Y(III), respectively. The desorption of Pr(III) from the loaded resin was achieved with 1.0 M citric acid at pH = 3 and found to be 58.0%. On the other hand, the maximum desorption of Dy(III) and Y(III) were achieved with 1.0 M nitric acid and 1.0 M ammonium carbonate, respectively. The sorption isotherm results indicated that Pr(III) and Y(II) fitted with nonlinear Langmuir isotherm model with regression factors 0.995 and 0.978, respectively; while, Dy(III) fitted with nonlinear Toth isotherm model with R2 = 0.966. A Flow sheet which summarizes the sorption and desorption processes of Pr(III), DY(III) and Y(III) using Dowex 50WX8 from nitric acid solution under the optimum conditions is also given.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and equilibrium studies on the recovery of praseodymium (III), dysprosium (III) and yttrium (III) using acidic cation exchange resin

2022

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“…It was established [23,24] that ferric ions quite successfully compete with REMs ions, and calcium ions block the surface of the ionite grains during the sorption from the solutions containing iron and calcium with sulfocationion ions.…”

Section: Introductionmentioning

confidence: 99%

Sorption Extraction of Rare Earth Metals from Wet-Process Phosphoric Acid

Baltabekova

Kenzhaliyev

Lokhova

et al. 2021

ARFMTS

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When apatites and phosphorites are processed, up to 30% of rare earth metals are converted into wet-process phosphoric acid. Wet-process phosphoric acid from the phosphorite treatment process differs from apatite one by impurity composition, i.e. the iron content is by 3.5 times, and calcium is by 5.0 times more. The complex composition of the wet-process phosphoric acid from the phosphorite treatment process requires additional researches to select optimal ion exchangers and technological parameters of sorption. Various aspects of sorption have been studied to select the optimal ion exchangers and technological parameters, and technological modes for desorption of rare earth metals from a cation exchanger to obtain a concentrate of rare earth metals have been completed. The method enables to extract rare earth metals without changing the composition of commercial wet-process phosphoric acid directly in the production process of the enterprises engaged in the phosphorite treatment process.

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“…Extraction technologies have a number of significant limitations, in particular, a large number of separation steps along with the difficulty in separating liquid phases [8], which is of particular importance for REE separation processes, where the use of undiluted TBP with high viscosity and density close to the density of the aqueous phase is often required. This imposes some restrictions on the extraction conditions and complicates the hardware design of the process.…”

mentioning

confidence: 99%

Application of silica-based sorbents to extraction of rare earth elements from loparite processing products

Муслимова¹,

Bujnovskij²,

Karakchieva³

et al. 2022

nfm

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Apatite and loparite are the main sources of rare earth elements (REE) in Russia. Loparite is a complex titanate and niobate containing up to 30% wt. of REE oxides predominantly of the cerium group. Extraction processing methods are used at the stages of group separation and separation of REE concentrates. Tributyl phosphate (TBP) is a widely used extracting agent for these purposes. Extraction technologies have a number of disadvantages, in particular, a large number of separation stages because of low separation coefficients of individual REE combined with difficulties in separating liquid phases. The use of TBP-containing sorbents allows to eliminate the latter disadvantage. Both organic polymers and inorganic compounds may be used as sorbent carriers; among inorganic ones, silica is widely used, and it was selected for this study. The purpose of this work was to study the effect of variations of the proposed methods for synthesis of silica and modified TBP based sorbents on their ability to extract REE from the solutions of loparite concentrate processing. The article briefly describes a procedure for sorbent samples synthesis. Tetraethoxysilane, tributyl phosphate, stannic chloride and nanotubes have been used as starting reagents for the synthesis. A number of physicochemical properties have been determined for the synthesized samples (pore volume and their average diameter, surface area and morphology, acid-base properties of the surface), and thermogravimetric analysis has been performed. The sorption properties of the samples have been tested by the example of REE extraction from process solutions of loparite working up. The separation coefficients of Sm/La pairs up to 3.7, Pr/Nd up to 1.8 were obtained; therefore, the studied samples may be potentially used for samarium isolation from the REE combination, as well as for Pr -Nd pair separation.

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Sorption in the chemistry of rare earth elements

Cited by 23 publications

References 260 publications

Modeling and equilibrium studies on the recovery of praseodymium (III), dysprosium (III) and yttrium (III) using acidic cation exchange resin

Modeling and equilibrium studies on the recovery of praseodymium (III), dysprosium (III) and yttrium (III) using acidic cation exchange resin

Sorption Extraction of Rare Earth Metals from Wet-Process Phosphoric Acid

Application of silica-based sorbents to extraction of rare earth elements from loparite processing products

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