Double Purification Technique for Crude Yellowcake: Selective Dissolution of Impurities and Liquid-Liquid Extraction from Acetate Media
- Authors: Eliwa A.A.1, Morsy A.M.1, Khawassek Y.M.1
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Affiliations:
- Nuclear Materials Authority
- Issue: Vol 61, No 5 (2019)
- Pages: 562-568
- Section: Article
- URL: https://journals.rcsi.science/1066-3622/article/view/225305
- DOI: https://doi.org/10.1134/S1066362219050072
- ID: 225305
Cite item
Abstract
Innovated two-stage technique was developed for the uranium purification starting from Egyptian crude yellowcake. Preliminary purification using urea-tetrahydrofuran system allowed removal of large amounts of undesirable gangues. The second purification stage using acetate aqueous liquor/Alamine 308 solvent extraction system allowed removal of the remaining gangues from the semirefined cake. The maximum loading capacity of the organic solvent was 42 gU L-1 after five contacts between the two phases under the optimized conditions: 10% solvent concentration in kerosene, 5 min shaking time, aqueous feed pH 0.25, and 1 : 1 organic to aqueous ratio. Uranium stripping was done using ammonium carbonate solution. The final purified uranium peroxide cake (66.2% U) of nuclear purity, meeting the ASTM C788-03 standard, was obtained from the stripping solution after hydrogen peroxide precipitation.
Keywords
About the authors
A. A. Eliwa
Nuclear Materials Authority
Author for correspondence.
Email: aaaliwa@yahoo.com
Egypt, 550 El-Maadi, Cairo, 11742
A. M. Morsy
Nuclear Materials Authority
Email: aaaliwa@yahoo.com
Egypt, 550 El-Maadi, Cairo, 11742
Y. M. Khawassek
Nuclear Materials Authority
Email: aaaliwa@yahoo.com
Egypt, 550 El-Maadi, Cairo, 11742