Thermal behavior and kinetic modeling of (NH4)4UO2(CO3)3 decomposition under non-isothermal conditions

Korichi, S.; Mernache, F.; Benaouicha, F.; Aoudia, N.; Amrane, Abdelatif; Hadji, S.

doi:10.1007/s10967-017-5444-2

Cited by 3 publications

(20 citation statements)

References 35 publications

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“…More details about the calculation method of conversion fraction (a), rate of a solid-state decomposition reaction (da/dt), and integral mathematical expression for the mechanism reactions g(a) have been shown elsewhere. 1 Isothermal model-fitting methods (conventional method). In order to analyze the isothermal kinetic data from the conventional method, two fits are involved:…”

Section: Modelmentioning

confidence: 99%

“…The results of the chemical and physical characterization of the used AUC powder (Figure 1) have been given elsewhere. 1 Optic microscope photographs of the AUC and U 3 O 8 samples are shown in Figure 2. In this figure, it can be observed that the original AUC powder (Figure 2(a)) is presented in the agglomerates and heterogeneous form.…”

Section: Characterization Of the Raw And Treated Auc Samplesmentioning

confidence: 99%

“…This article is an extension of a previous paper where the ammonium uranyl carbonate (AUC) samples under non-isothermal conditions were decomposed and characterized. 1 Using modeling approach and under isothermal conditions, the kinetic parameters of the solid-state reactions (activation energy E a , rate constant k, and pre-exponential factor A) can be obtained. [2][3][4] The uranium oxide (UO 2 ) is used as nuclear fuel in the nuclear fuel cycle.…”

Section: Introductionmentioning

confidence: 99%

“…This article is an extension of a previous paper where the ammonium uranyl carbonate (AUC) samples under non-isothermal conditions were decomposed and characterized. 1…”

Section: Introductionmentioning

confidence: 99%

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Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide

Korichi¹,

Nacera²,

Hanane³

et al. 2019

Progress in Reaction Kinetics and Mechanism

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The ammonium uranyl carbonate, (NH4)4UO2(CO3)3, is an important material used in UO2 and U3O8 ceramics production for the nuclear fuel fabrication. Thermal study and kinetic analysis of ammonium uranyl carbonate conversion under isothermal conditions has been studied in air atmosphere to obtain the tri-uranium octoxide (U3O8), using muffle furnace equipment, UV–visible spectrophotometer, gas adsorption, Hg porosimetry, laser granulometry, and optic spectroscopy. The textural properties (specific surface area, morphology, pore size, grain size, inter-particular porosity, and intra-particular porosity) and characteristics (uranium content and stoichiometry) of the prepared samples were estimated from the physical–chemical characterization. The kinetic parameters were estimated by a fitting of the experimental data. The activation energy Ea, frequency factor A, and reaction rate constants k were calculated from the conventional and iso-conversion kinetic models and were within the range of literature values. The activation energy average values are 36.69 and 30.36 kJ mol−1 by conventional and iso-conversion models, respectively.

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Section: Modelmentioning

confidence: 99%

Section: Characterization Of the Raw And Treated Auc Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This article is an extension of a previous paper where the ammonium uranyl carbonate (AUC) samples under non-isothermal conditions were decomposed and characterized. 1…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide

Korichi¹,

Nacera²,

Hanane³

et al. 2019

Progress in Reaction Kinetics and Mechanism

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“…In this work, the wet chemistry route process was used to recover and recycle a defective UO 2 sintered pellets. Our aim is to determine the adequate dissolution conditions using a stirred batch reactor to get uranyl nitrate hydrate solution with a required specification allowing its precipitation to ammonium uranyl carbonate [23]. The attention was focused to the effect of acidity and temperature on the reaction rate.…”

Section: Reaction Equationsmentioning

confidence: 99%

Recycling Scrap from Un-Irradiated Nuclear Fuel by HNO3 Leaching

2020

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The work describes the wet chemical route process to recover and recycle a defective un-irradiated uranium dioxide sintered pellets. The optimal conditions of the un-irradiated UO 2 sintered pellets dissolution in Nitric acid solutions has been examined. The effects of acid concentration, contact time and temperature on dissolution action have been studied. The samples were exposed to leaching over a range of nitric acid concentrations 2-8 mol/L and temperatures from 20 to 70 °C. The stoichiometry of the dissolution reaction depends on the acidity of the solution. The shrinking core model (product diffusion control model and chemical reaction control model) was used to correlate the experimental results. Kinetics study shows that the chemical reaction model controls the dissolution of UO 2 sintered pellets in nitric acid solution. The average value of apparent activation energy estimated from the temperature effect of the chemical reaction was found to be about 101.40 kJ/ mol. The optimal conditions to dissolve the UO 2 sintered pellets in nitric acid solution have been proposed.

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Uranyl ammonium carbonate precipitation and conversion into triuranium octaoxide

Hung,

Thuan,

Thuy

et al. 2024

Heliyon

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Thermal behavior and kinetic modeling of (NH4)4UO2(CO3)3 decomposition under non-isothermal conditions

Cited by 3 publications

References 35 publications

Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide

Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide

Recycling Scrap from Un-Irradiated Nuclear Fuel by HNO3 Leaching

Uranyl ammonium carbonate precipitation and conversion into triuranium octaoxide

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Thermal behavior and kinetic modeling of (NH4)4UO2(CO3)3 decomposition under non-isothermal conditions

Cited by 3 publications

References 35 publications

Kinetic studies of isothermal decomposition of (NH4)4UO2(CO3)3 to uranium oxide

Kinetic studies of isothermal decomposition of (NH4)4UO2(CO3)3 to uranium oxide

Recycling Scrap from Un-Irradiated Nuclear Fuel by HNO3 Leaching

Uranyl ammonium carbonate precipitation and conversion into triuranium octaoxide

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Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide

Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide