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| Study on Leaching of Low-Grade Uranium Mines |
| Received:March 21, 2019 Revised:March 25, 2019 |
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| DOI：doi：10.3969/j.issn.1007-7545.2019.08.010 |
| KeyWord:low-grade uranium ore; leaching; sulfuric acid; mechanism |
| Author | Institution |
| Rao Miaomiao |
东华理工大学核资源与环境国家重点实验室 |
| Zhou Zhongkui |
东华理工大学核资源与环境国家重点实验室 |
| Zheng Lili |
东华理工大学核资源与环境国家重点实验室 |
| Ge Yubo |
东华理工大学核资源与环境国家重点实验室 |
| Sun Zhanxue |
东华理工大学核资源与环境国家重点实验室 |
| Xu Lingling |
东华理工大学核资源与环境国家重点实验室 |
| Chen Gongxin |
东华理工大学核资源与环境国家重点实验室 |
| Gao Xu |
东华理工大学核资源与环境国家重点实验室 |
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| Abstract: |
| Based on analysis of mineralogical properties of low-grade refractory uranium ore, effects of concentration of sulfuric acid, iron concentration and temperature on uranium leaching were carried out. Changes of phase and morphology during uranium leaching were analyzed by XRD and SEM. The mechanism of sulfuric acid and oxidant Fe3+ on leaching of low-grade refractory uranium were revealed. The results show that uranium leaching rate is 98.38% under the conditions including temperature of 45 ℃, leaching time of 48 h, sulfuric acid concentration of 214.5 g/L, and Fe3+ concentration of 11.1 g/L. Increase of Fe3+ concentration can destroy gangue structure, and its oxidation reaction can accelerate leaching of uranium. |
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