Bioleaching Studies of Uranium in a Rock Sample from Sinai Using Some Native Streptomyces and Aspergillus Species.

摘要: Sinai's important geographical and strategic position is attracting researchers to explore opportunities maximize exploitation of its treasures, especially in the area sustainable development. One fields extracting valuable metals from low-grade ores using green technologies. In this study, we examined possibility microbial leaching uranium (U) a rock sample collected Wadi Naseib, Sinai, Egypt. Twenty previously isolated tentatively identified native microorganisms, 10 Streptomyces Aspergillus, were used make U-bioleaching cells (direct) cell metabolites (indirect). The tested isolates showed variable efficiencies highest results was attained via indirect method (57.2 ± 9.2% 83.6 ± 2.3%) two that genotypically as sp. EGY1 Aspergillus niveus EGY2 respectively. TEM images A. made biomineralization, biosorption bioaccumulation U. present study revealed neither high acid production nor phosphatase activities guarantees efficiency. Many factors affecting process also studied EGY2. efficiency (87.8 ± 8.7%) pH 9, 160 rpm both culturing bioleaching steps, particle size above 700 µm 1% pulp density. U recovered leach liquor after optimization experiments NaOH concentration 64.35%. Our could be promising future scaling-up studies pilot trials sample.