OPTIMIZATION OF DIFFERENT PHYSICAL PARAMETERS FOR BIOLEACHING OF URANIUM AND RARE EARTH ELEMENTS FROM NUBIA SANDSTONES, WADI NATASH, EASTERN DESERT, EGYPT | ||||
Nuclear Sciences Scientific Journal | ||||
Article 12, Volume 2, Issue 1, 2013, Page 165-174 PDF (1.29 MB) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/nssj.2013.30992 | ||||
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Authors | ||||
MOHAMED E. IBRAHIM1; ZINAB K. ABDEL AZIZ2; HAMD I. MIRA1; MAYSA M. AMIN1; WESSAM M. MORSY1 | ||||
1Nuclear Materials Authority,Cairo, Egypt | ||||
2Al Azhar University, Faculty of Science, Microbiology Department | ||||
Abstract | ||||
Five fungal species were isolated from two Nubia sandstone samples at Wadi Natash, Eastern Desert, Egypt. These species were then tested for their ability in bioleaching of uranium and rare earth elements from the two ore samples (G1&G2) whose assay of U attains 65 and 150ppm respectively while their assay of REEs attains 1590 and 1152 ppm respectively . Among the isolated fungi both Aspergillus niger and Aspergillus flavus have been the only species that give the highest leaching efficiencies .Thus in case of G2 sample the leaching of U has reached up to 90% of uranium by using A.niger while that of REEs has attained 84% by A .flavus under the studied optimum conditions .The latter involved shaking at 100rpm for 7days incubation time, 2% pulp density,> 0.2mm grain size and 35ºC incubation temperature. Production of organic acids (oxalic and, citric acids) by two fungal species in their culture filtrate representes the key of the realized bioleaching processes. | ||||
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