Modified acidic leaching for selective separation of thorium, phosphate and rare earth concentrates from Egyptian crude monazite

Borai, Ε. H.; El-Ghany, Mohamed S. Abd; Ahmed, Ismail; Hamed, Mostafa M.; El-Din, Ahmed M. Shahr; Aly, H. F.

doi:10.1016/j.minpro.2016.02.003

Cited by 44 publications

(16 citation statements)

References 11 publications

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Section: Resultsmentioning

confidence: 99%

“…Since the values of Nd(III) Kd at presence of HNO3, HCl, and H2SO4 differ insignificantly, SIR 4 may be used for REEs recovery from slightly sulfuric medium, which may be important at practical side [64][65][66]. The decrease of K d with the rise of metal concentration in aqueous phase (eluent) is typical for various resins used in liquid chromatography and is attributed to a limited number of adsorption centers on the surface of resins [60].…”

Section: The Influence Of Acid Typementioning

confidence: 99%

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Solvent-Impregnated Resins Based on the Mixture of (2-Diphenylphosphoryl)-4-ethylphenoxy)methyl) diphenylphosphine Oxide and Ionic Liquid for Nd(III) Recovery from Nitric Acid Media

Kovalenko

Баулин

et al. 2021

Molecules

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Novel solvent-impregnated resins (SIRs) were prepared by treatment of styrene–divinylbenzene copolymer (LPS-500) with mixtures of the promising polydentante extractant (2-diphenylphosphoryl)-4-ethylphenoxy)methyl)diphenylphosphine oxide (L) and an ionic liquid [C4mim]+[Tf2N]−for the extraction chromatography recovery of Nd(III) from nitric acid solutions. It was shown that introduction of the ionic liquid into the SIR composition results in considerable enhancement of the Nd(III) recovery efficiency compared with resin impregnated only by L in slightly acidic media. The influence of the L: ionic liquid molar ratio in the SIRs composition, their percentages, concentration of metal and HNO3 in the eluent, and acid type on the value of synergistic effect and adsorption efficiency of Nd(III) recovery was studied. The SIR containing 40% of mixture of L and [C4mim]+[Tf2N]− with molar ratio 2:1 turned out to be the most efficient. The selectivity of Nd(III) separation from light and heavy rare-earth elements was studied and the optimal conditions of Nd(III) adsorption recovery and stripping by this SIR were chosen. It was found that in recovery efficiency of Nd(III) developed SIR exceeded the SIR containing Cyanex 923 (a mixture of monodentate trialkylphosphine oxides) and [C4mim]+[Tf2N]−.

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Section: Resultsmentioning

confidence: 99%

Section: The Influence Of Acid Typementioning

confidence: 99%

Solvent-Impregnated Resins Based on the Mixture of (2-Diphenylphosphoryl)-4-ethylphenoxy)methyl) diphenylphosphine Oxide and Ionic Liquid for Nd(III) Recovery from Nitric Acid Media

Kovalenko

Баулин

et al. 2021

Molecules

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“…The elution of the sorbent was performed using 0.2 M HCl/0.5 M CaCl 2 solution and the eluate was treated by oxalic acid precipitation at pH 1.1 [58][59][60][61]. The semi-quantitative analysis of desorbed sorbent shows that the desorption yield exceeds 98% for REEs.…”

Section: Elution and Valorizationmentioning

confidence: 99%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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Alginate-PEI beads are functionalized by phosphorylation and applied for the sorption of Nd(III) and Mo(VI). The successful grafting of phosphoryl groups (as tributyl phosphate derivative) is characterized by FTIR and XPS analysis, elemental analysis, titration (pH PZC ), TGA, BET and SEM-EDX analyses. The multi-functional characteristics of the sorbent (i.e., carboxylic, hydroxyl, amine and phosphate groups) contribute in the binding of metal ions having different physicochemical behaviors. The sorption of Nd(III) is strongly increased by phosphorylation, while for Mo(VI) the enhancement is rather limited. Optimum sorption occurs at pH 3-4: maximum sorption capacity reaches up to 1.46 mmol Nd(III) g − 1 and 2.09 mmol Mo(VI) g − 1 ; sorption isotherms are fitted by the Langmuir equation. The equilibrium is reached within 30-40 min and the kinetic profiles are simulated by the pseudo-first order rate equation. The coefficients of the effective diffusivity are close to the self-diffusivity of Nd(III) and Mo(VI) in water; as a confirmation of the limited impact of resistance to intraparticle diffusion in the kinetic control. The sorbent is selective for Nd(III) over Mo(VI) and other alkali-earth or base metals (at pH close to 2.5-3). Metals can be readily desorbed using 0.2 M HCl/0.5 M CaCl 2 as the eluent. The loss in sorption does not exceed 5% at the fifth cycle, while desorption remains complete. A series of treatments (including acidic leachate, cementation, precipitation, sorption and elution) is successfully applied for the recovery of rare earths from Egyptian ore; with enrichment in the oxalate precipitate of Nd(III), Gd(III), Sm(III) and Eu(III).

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“…The ideal case is to find distinct pH values to separate radioactive elements from REE. Uranium and REE precipitate at close pH values with a risk of co-precipitation, whereas a high recovery of thorium is achievable since its precipitation requires a different pH [43][44][45][46]. Table 3 presents the pH ranges required for the precipitation of uranium, thorium, and REE in both chloride and sulfate liquors.…”

Section: Separation By Precipitationmentioning

confidence: 99%

Separation of Radioactive Elements from Rare Earth Element-Bearing Minerals

García

Latifi

Amini

et al. 2020

Metals

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Rare earth elements (REE), originally found in various low-grade deposits in the form of different minerals, are associated with gangues that have similar physicochemical properties. However, the production of REE is attractive due to their numerous applications in advanced materials and new technologies. The presence of the radioactive elements, thorium and uranium, in the REE deposits, is a production challenge. Their separation is crucial to gaining a product with minimum radioactivity in the downstream processes, and to mitigate the environmental and safety issues. In the present study, different techniques for separation of the radioactive elements from REE are reviewed, including leaching, precipitation, solvent extraction, and ion chromatography. In addition, the waste management of the separated radioactive elements is discussed with a particular conclusion that such a waste stream can be employed as a valuable co-product.

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Modified acidic leaching for selective separation of thorium, phosphate and rare earth concentrates from Egyptian crude monazite

Cited by 44 publications

References 11 publications

Solvent-Impregnated Resins Based on the Mixture of (2-Diphenylphosphoryl)-4-ethylphenoxy)methyl) diphenylphosphine Oxide and Ionic Liquid for Nd(III) Recovery from Nitric Acid Media

Solvent-Impregnated Resins Based on the Mixture of (2-Diphenylphosphoryl)-4-ethylphenoxy)methyl) diphenylphosphine Oxide and Ionic Liquid for Nd(III) Recovery from Nitric Acid Media

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Separation of Radioactive Elements from Rare Earth Element-Bearing Minerals

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