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| Self-organization Evolution of Bioleaching Process of Acidithiobacillus Ferrooxidans and Acidiphilium Multivorum |
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Received:December 08, 2024
Published Online:May 30, 2025
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| View Full Text View/Add Comment Download reader |
| DOI：10.20237/j.issn.1007-7545.2025.06.015 |
| KeyWord:bioleaching; uranium ore; Acidithiobacillus ferrooxidans; Acidiphilium multivorum; synergism |
| Author | Institution |
| YUAN Zhihua |
东华理工大学 核资源与环境国家重点实验室，南昌 ;东华理工大学 土木与建筑工程学院，南昌 |
| SHENG Yanwu |
东华理工大学 土木与建筑工程学院，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 Zhongkui |
东华理工大学 核资源与环境国家重点实验室，南昌 |
| LIU Yajie |
东华理工大学 核资源与环境国家重点实验室，南昌 |
| LIU Jinhui |
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 |
| LI Mingdong |
东华理工大学 土木与建筑工程学院，南昌 |
| WEN Tao |
赣东学院，江西 抚州 |
| LI Siyu |
东华理工大学 土木与建筑工程学院，南昌 |
| CHEN Jiaxing |
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: |
| Acidiphilium multivorum (A.m) has the ability of iron reduction and sulfur oxidation, which has important implications for uranium bioleaching. The results show that the synergistic mechanism of Acidithiobacillus ferrooxidans (A.f) and A.m bacteria in uranium bioleaching is mainly manifested as the synergistic effect of iron cycle and carbon cycle. When a hard rock-type uranium ore is used as leaching material to carry out the synergistic leaching of uranium by A.f and A.m bacteria, the iron reduction of A.m bacteria and the iron oxidation of A.f bacteria promote the iron cycle in the leaching system. The iron cycle makes A.f and A.m bacteria obtain more and longer energy substances, which promotes their growth and reproduction. In the process of leaching uranium, A.f bacteria will produce organic matter, which will limit the growth and reproduction of A.f bacteria, but A.m bacteria can use these organic matter for heterotrophic growth in the process of iron reduction, so it can relieve its inhibition on the growth and reproduction of A.f bacteria, and produce CO2, which can further provide inorganic carbon source for A.f bacteria. In addition, A.m can also use elemental sulfur to obtain energy and promote the oxidation of elemental sulfur to sulfuric acid. Sulfuric acid can decompose jarosite on the surface of uranium ore, alleviate the formation of passivation film on the surface of uranium ore, and ultimately improve the leaching efficiency of uranium. The addition of A.m bacteria improved the uranium leaching efficiency of A.f bacteria. In this experiment, the uranium leaching of pure A.f group is basically completed within 48 hours, and the leaching rate of uranium is 87.75%. The leaching results of the bacteria group with A.f and A.m of 10:1 are not much different from those of the pure A.f bacteria group before 12 hours, but the leaching of uranium in the bacteria group with A.f and A.m of 10:1 is accelerated after 12 hours. The uranium is basically leached in 60 hours, and the leaching rate is as high as 98%. The leaching efficiency of the bacteria group with A.f and A.m of 10:1 is 11.68% higher than that of the pure A.f bacteria group. In summary, A.f has iron-sulfur oxidation, and A.m has iron reduction and sulfur oxidation. The iron reduction of A.m bacteria can be used to cooperate with the iron oxidation of A.f bacteria to promote the circulation of iron in the bioleaching system. The iron circulation makes A.f and A.m bacteria obtain longer energy substances. |
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