期刊
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
卷 314, 期 1, 页码 251-258出版社
SPRINGER
DOI: 10.1007/s10967-017-5406-8
关键词
Bioleaching; Acidithiobacillus ferrooxidans; Leptospirillum ferriphilum; Plant-scale; Leaching efficiency
资金
- National Nature Science Foundation of China [51564001, 41662024]
- International Science and Technology Cooperation Projects of China [2011DFR60830]
- Science and Technology Foundation of the Education Department of Jiangxi Province [KJLD13048]
- Natural Science Foundation of Jiangxi Province [20171BAB213019]
We evaluated uranium bioleaching from low-grade, granite-type uranium ore using mixed acidophilic microbes from uranium mine leachate. A 4854-ton plant-scale heap bioleaching process achieved sustained leaching with a uranium leaching efficiency of 88.3% using a pH of 1.0-2.0 and an Fe3+ dosage of 3.0-5.5 g/L. Acid consumption amounted to 25.8 g H2SO4 kg(-1) ore. Uranium bioleaching follows a diffusion-controlled kinetic model with a correlation coefficient of 0.9136. Almost all uranium was dissolved in aqueous solution, except those encapsulated in quartz particles. Therefore, heap bioleaching by mixed acidophilic microbes enables efficient, economical, large-scale recovery of uranium from low-grade ores.
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