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| Bioleaching of uranium ore from a low-grade sandstone-type uranium deposit |
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| DOI：10.3969/j.issn.1671-4172.2019.03.001 |
| KeyWord:sandstone-type uranium deposit; bioleaching; acidity; ferric ion |
| Author | Institution |
| WANG Xiao |
东华理工大学 核资源与环境国家重点实验室，南昌 |
| SUN Zhanxue |
东华理工大学 核资源与环境国家重点实验室，南昌 |
| ZHOU Yipeng |
东华理工大学 核资源与环境国家重点实验室，南昌 |
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| Abstract: |
| Batch bioleaching of low-grade sandstone-type uranium ore taken from the Yili basin, had been conducted using bacterial solution at different acidity and ferric concentrations. Uranium dissolution characteristics and effects of acidity and Fe3+ concentrations on the uranium dissolution were discussed. Results indicated that the uranium dissolution occurred mainly in the first 8 h of each test. The maximum dissolution rate of uranium reached to 16 %/h, and the dissolution rate decreased rapidly. Uranium recovery was positively correlated with acidity. However, when the ferric concentration was higher than 2.0 g/L, the inhibition on uranium dissolution will occur, which may be related to the occurrence of jarosite precipitation. During the leaching processes, the pH value increased and Eh decreased, and the variations of them were all inversely correlated to ferric concentration. It was summarized that acidity of 5 g/L and ferric concentration of 1.5 g/L were reasonable for leaching of the ore from the interest deposit. |
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