Faezeh Fatemi - Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, I.R. Iran
Abbas Rashidi - Department of Chemical Engineering, Faculty of Engineering, University of Mazandaran, Babolsar, Iran
Samaneh Jahani - Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, I.R. Iran
Hassan Zare Tavakoli - Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, I.R. Iran

Bioleaching processes for extraction of uranium from low grade ore are more environmentally friendly and consume less energy than conventional technologies. In this investigation, the mixed culture for uranium dissolution at different pulp densities was used. For this purpose, Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans cultivated in APH medium with pH 2 and different pulp densities (5, 10 and 15%) of anomaly I at 150rpm and 35oC. Measurement of uranium extraction showed that, uranium recoveries of 100% were obtained in 2 and 4 days in bioleaching process at 5 and 10% pulp densities, respectively, while 94% of uranium extraction achieved at 15% of pulp density during 7 days

Pulp density, Uranium, Mixed culture