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| Leaching Characteristics and Mechanism of Uranium and Scandium from Leaching Residues of a Sandstone Type Uranium Ore |
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Received:July 28, 2022
Revised:August 03, 2022
Accepted:August 05, 2022
Published Online:November 14, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.12.012 |
| KeyWord:sandstone uranium ore; uranium; scandium; leaching characteristics; kinetics |
| Author | Institution |
| KONG De-xuan |
东华理工大学水资源与环境工程学院 |
| WEI Xue-bin |
中国石油青海油田分公司勘探开发研究院 |
| CHEN Gong-xin |
东华理工大学水资源与环境工程学院 |
| LIU Jin-hui |
东华理工大学水资源与环境工程学院 |
| ZHOU Zhong-kui |
东华理工大学水资源与环境工程学院 |
| GAO Bing-lun |
东华理工大学水资源与环境工程学院 |
| MA Cheng-cui |
东华理工大学水资源与环境工程学院 |
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| Abstract: |
| With the depletion of high-grade uranium ore in recent years, the recovery of associated elements from low-grade uranium ore to reduce production costs has become popular. In order to improve leaching rate of U and its associated element Sc in process of U leaching, effects of H2SO4 concentrations, L/S, and temperatures on leaching rate of U and Sc were investigated. Applying alkaline residue sample from a sandstone-type uranium ore after alkaline column leaching as the study object to establish leaching kinetic model based on an unreacted shrinkage nucleation model. The results show that leaching rate of U and Sc rises as the increase of temperature under sulfuric acid concentration of 30 g/L, L/S of 2 mL/g, and leaching duration of 192 h. When the temperature is below 30 ℃, leaching is controlled by chemical reaction, and the leaching rate increases quickly but remains low. When the temperature exceeds 30 ℃, the process is mixed control, and leaching rate of U is higher than that of Sc. The activation energy of the leaching process controlled by mixing for U and Sc is 41.28 and 15.887 kJ/mol respectively. |
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