Development of selective separation method for thorium and rare earth elements from monazite liquor

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

doi:10.1007/s10967-018-5814-4

Cited by 22 publications

(2 citation statements)

References 14 publications

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“…A set of technologies were forerun to separate thorium ions from its solutions, and these methods were chemical precipitation [4], ion exchange [5,6], liquid-liquid extraction [7][8][9], and adsorption [10][11][12]. Amongst these techniques, adsorptions are typical extensively utilized for separating heavy and radioactive metal ions on laboratory and industrial scales, because this method is low-cost, environmentally compatible and very efficient [13].…”

Section: Introductionmentioning

confidence: 99%

Performance of poly sulfonamide/nano-silica composite for adsorption of thorium ions from sulfate solution

Cheira

2020

SN Appl. Sci.

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A new composite of poly sulfonamide/nano-silica composite (PSA/silica) was synthesized from the polymerization of sulfonamide in the presence of the prepared nano-silica. The prepared nano-silica, poly sulphonamide (PSA), and PSA/ silica composites were utilized for Th(IV) adsorption from sulfate solution. These composites described by XRD, surface area analysis, SEM-EDX, and FT-IR techniques. The influence parameters on the Th(IV) adsorption were pH solution, ionic strength, contact time, adsorbent dose, Th(IV) concentration, and temperature besides the coexisting ions. At best parameters (pH4, 0.1 g adsorbent amount, and 45 min contact time), 200 mg/L Th(IV) ions were quantitatively adsorbed from 100 mL solution. The maximum uptake capacities of the nano-silica, PSA, and PSA/silica composites attained 122, 75, and 197 mg/g at 298 K. From the kinetic and equilibrium data were found to the adsorption processes of three composites fitted well with kinetic model of pseudo-second-order and Langmuir adsorption isotherm model. Thermodynamic studies resulted that negative values for ∆H° indicated an exothermic while positive values ∆S° showed random behavior for Th(IV) adsorption, while negative values of ∆G° indicated spontaneous Th(IV) adsorption. The maximum Th(IV) desorption from the loaded adsorbents performed by 0.1 M/L HCl.

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Section: Introductionmentioning

confidence: 99%

Performance of poly sulfonamide/nano-silica composite for adsorption of thorium ions from sulfate solution

Cheira

2020

SN Appl. Sci.

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“…The effective separation and purification of lanthanides from these impurities is thus an interesting step. Most of the studies under this aim usually utilize the traditional precipitation method (Abreu and Morais 2010;Borai et al 2018;Kumari et al 2018;Rodliyah et al 2015). The disadvantages of the precipitation method are that more time is spent in digest, filtering, or washing and disposal the precipitates, limited recovery of rare earths, highly dependent on pH that Ln 3+ can co-precipitate with Th and U with any error in the detection of the pH value, and pollution from the storage of radioactive precipitate (Ang et al 2018;Wang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Selective separation and purification of cerium (III) from concentrate liquor associated with monazite processing by cationic exchange resin as adsorbent

et al. 2023

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The present study is directed to find the optimal conditions required for efficient separation and purification of Ce3+ as an analog for lanthanides from Fe3+, Th4+, and Zr4+ (interfering ions) using Amberlite IR120H (AIR120H) resin as a strongly cationic exchange adsorbent. The main factors affecting the separation processes had been investigated and optimized. Ce3+ (Ln3+) as an admixture with Fe3+, Th4+, and Zr4+ was successfully separated by batch and column techniques. The sorption efficiency (S, %) from different acidic media was in this order: HCl > HNO3 > H2SO4. In a quaternary mixture with Fe3+ and Th4+, the maximum separation factor between Ce3+ and Zr4+ was ~ 13 after 90 min of equilibration, and the sorption capacity of AIR120H resin for Ce3+ was 8.2 mg/g. The rate of adsorption was found to follow a pseudo-second-order kinetic model. Separation of the absorbed ions was achieved by desorption processes. Firstly, 98 ± 2% of loaded Ce3+ is fully desorbed by 1 M sodium acetate solution without interfering ions. Moreover, ~ 95% of Zr4+ is desorbed by 1 M citric acid solution. Finally, 85% of loaded Fe3+ and Th4+ ions are desorbed with 8 M HCl solution. The batch technique was applied to separate and purify Ln3+-concentrate in chloride liquor (LnCl3), coming from the caustic digestion of Egyptian high-grade monazite. However, the enhanced radioactivity in LnCl3 due to radium -isotopes (228Ra2+, 226Ra2+, 224Ra2+, 223Ra2+) and radio-lead (210Pb2+) is initially reduced by a factor of 92% (i.e., safe limit) by pH-adjustment. As result, it can be recommended that the sorption process by AIR120H resin is efficient and promising for exploring pure lanthanides from its minerals.

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Graphene Oxide Caged Biopolymer Nanocomposite for Purification of Rare Earth Elements from High Grade Egyptian Monazite Concentrate

2021

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Development of selective separation method for thorium and rare earth elements from monazite liquor

Cited by 22 publications

References 14 publications

Performance of poly sulfonamide/nano-silica composite for adsorption of thorium ions from sulfate solution

Performance of poly sulfonamide/nano-silica composite for adsorption of thorium ions from sulfate solution

Selective separation and purification of cerium (III) from concentrate liquor associated with monazite processing by cationic exchange resin as adsorbent

Graphene Oxide Caged Biopolymer Nanocomposite for Purification of Rare Earth Elements from High Grade Egyptian Monazite Concentrate

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