Bioreactor leaching of uranium from a low grade Indian silicate ore |
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| Institution: | 1. Reactors Department, Nuclear Research Center, Atomic Energy Authority of Egypt, P.O. 13759, Inshas, Cairo, Egypt;2. Centre of Nuclear Engineering (CNE), Department of Materials, Imperial College London, London, SW7 2BP, UK;3. Hot Laboratory Center, Atomic Energy Authority of Egypt, P.O. 13759, Inshas, Cairo, Egypt;1. Geochemistry Department of Chengdu University of Technology, Sichuan Province 610059, China;2. Key Laboratory of Nuclear Techniques in Geosciences, Sichuan Province 610059, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, PR China;2. Department of Oil-Gas Field Development Engineering, College of Petroleum Engineering, China University of Petroleum, Beijing 102249, PR China;3. School of Energy Resources, China University of Geosciences, Beijing 100083, PR China;4. ERE & BIC-ESAT, College of Engineering, Peking University, Beijing 100871, PR China |
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| Abstract: | Bio-leaching studies were carried out in a 2 L bioreactor- BIOSTAT-B® equipped with a PLC based controller at 20–40% (w/v) pulp density using enriched culture of A.ferrooxidans for Turamdih uranium ore (Jharkhand, India). With the enriched culture of A.ferrooxidans adapted on Fe(II) at pH 2.0, 35 °C and 20% (w/v) pulp density, a 98.3% uranium recovery was recorded in 14 days. The leaching of uranium in the bioreactor improved the dissolution rate by reducing the time from 40 days in shake flask as per our earlier studies to 14 days. While investigating the importance of biogenic Fe(III) in the bio-leaching process a maximum recovery of 84.7% U3O8 was observed at pH 2.0 and 20% (w/v) pulp density in 10 h as compared to the uranium leaching of 38.3% in the control experiments. On raising the pulp density to 30%, uranium bio-recovery increased to 87.6% in 10 h at pH 2.0 with <76 μm size material. This showed a distinct advantage because of better mixing of slurry in the bioreactor with auto-controlled conditions that improved the kinetics. |
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