Determination of hexavalent and tetravalent uranium in phosphate ores through hydrochloric acid selective leaching

Fouad, Hisham

doi:10.1007/s10967-010-0540-6

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…A possible mechanism is illustrated by eqn (1)-(3). [20][21][22] Moreover, HF-HCl deashing leads to an apparent increase in S, which is ascribed to the insolubility of CaSO 4 in both HF and HCl solutions.…”

Section: Ash Content and Composition Analysismentioning

confidence: 97%

High temperature ammonia modification of rice husk char to enhance CO₂ adsorption: influence of pre-deashing

Zhang

Yang

et al. 2015

RSC Adv.

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Section: Ash Content and Composition Analysismentioning

confidence: 97%

High temperature ammonia modification of rice husk char to enhance CO₂ adsorption: influence of pre-deashing

Zhang

Yang

et al. 2015

RSC Adv.

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“…Leaching using acids is the major process for uranium, especially with sulfuric acid. The latter has many advantages such as; moderately low cost and extensive availability [12,13] . New trends of leaching such as; pressure leaching, alkaline leaching, heap leaching, microbial leaching.…”

Section: Introductionmentioning

confidence: 99%

Recovery of uranium from ferruginous Shale mineralization from Um Bogma formation, Egypt, via Duolite ES‐467 chelating resin

Radwan

Gado

El–Wahab

et al. 2021

Zeitschrift anorg allge chemie

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The ferruginous shale iron content (27.5 %) is a serious problem that prevents the separation of uranium. Chemical dissolution of the ferruginous shale from Um Bogma Formation, Egypt, has been studied for the recovery of uranium using the acidic leaching method. Um Bogma representative sample assays 700 ppm of uranium as the element of interest. The effective dissolution parameters such as acid concentrations, solid/liquid addition ratio, leaching time, and leaching temperature were planned to investigate. It was found that The dissolution rate was greatly influenced by the studied dissolution factors. Analysis of the kinetic data showed that the dissolution mechanism is fitted well to shrinking core model within chemical reaction as a rate determining step. It was found that the recorded activation energy (Ea) of uranium dissolution is 205 kJ/mol. The uranium dissolution efficiency of 95.2 % has been achieved with optimized conditions of 250 g/L H2SO4; 1 : 7 (S/L) phase ratio; 250 °C for 7 hours. Finally, the best‐controlling factors were applied for uranium separation from Um Bogma leach liquor to produce a uranium concentrate with 69.985 % uranium purity.

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“…Chemically, the main methods used for uranium leaching from phosphate samples are the acidic and alkaline processes include hydrometallurgy or pyrometallurgy techniques [17]. The acidic leaching compared to alkaline have advantages include; more effective especially with hard ores, low temperature and time-consuming [18]. Sulfuric acid is the commonly used due to the high solubility of the produced uranyl sulfate complexes [19,20].…”

Section: Introductionmentioning

confidence: 99%

Alkaline leaching of uranium from El-Sibaiya East Phosphorite in the presence of sodium peroxide

Manaa

Negm

El‐Magied

2018

J. Nucl. Radiochem. Sci.

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Chemical, mineralogical and radiometric investigation studies were executed on a representative phosphorite sample collected from El-Sibaiya East area to evaluate its suitability for the alkaline leaching of its uranium content. The uranium alkaline leaching was carried out in three phases using Na 2 CO 3 and a mixture of Na 2 CO 3 / NaHCO 3 with/without an oxidant (Na 2 O 2 ). Factors include; Na 2 CO 3 , NaHCO 3 , Na 2 O 2 concentrations; digestion temperature, reaction time and ore fineness were studied and optimized. The results pointed to that the best leaching efficiency of uranium (83.2%) was conducted using the mixture solution of Na 2 CO 3 /NaHCO 3 (0.5M) in the presence of 2.5% Na 2 O 2 (w/w). The other conditions affected the leaching process were studied and optimized as 80 o C (leaching temperature), 3h (leaching time), 44μm (ore grain size) and a solid/liquid ratio of 2/25. The leached uranium was recovered by precipitation using NaOH solution where the precipitated product was defined by the XRD as sodium diuranate (Na 2 U 2 O 7 ) of high purity.

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Determination of hexavalent and tetravalent uranium in phosphate ores through hydrochloric acid selective leaching

Cited by 12 publications

References 5 publications

High temperature ammonia modification of rice husk char to enhance CO₂ adsorption: influence of pre-deashing

High temperature ammonia modification of rice husk char to enhance CO₂ adsorption: influence of pre-deashing

Recovery of uranium from ferruginous Shale mineralization from Um Bogma formation, Egypt, via Duolite ES‐467 chelating resin

Alkaline leaching of uranium from El-Sibaiya East Phosphorite in the presence of sodium peroxide

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Determination of hexavalent and tetravalent uranium in phosphate ores through hydrochloric acid selective leaching

Cited by 12 publications

References 5 publications

High temperature ammonia modification of rice husk char to enhance CO2 adsorption: influence of pre-deashing

High temperature ammonia modification of rice husk char to enhance CO2 adsorption: influence of pre-deashing

Recovery of uranium from ferruginous Shale mineralization from Um Bogma formation, Egypt, via Duolite ES‐467 chelating resin

Alkaline leaching of uranium from El-Sibaiya East Phosphorite in the presence of sodium peroxide

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High temperature ammonia modification of rice husk char to enhance CO₂ adsorption: influence of pre-deashing

High temperature ammonia modification of rice husk char to enhance CO₂ adsorption: influence of pre-deashing