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| Study On The Adaptability Of Acid Leaching In a Uranium Deposit In Xinjiang |
| Received:January 28, 2021 Revised:February 05, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：doi：10.3969/j.issn.1007-7545.2021.05.011 |
| KeyWord:sandstone-type uranium deposit; acid leaching; oxidant |
| Author | Institution |
| WU Bing |
东华理工大学核资源与环境国家重点实验室 江西 南昌 |
| ZHOU Yi-peng |
东华理工大学核资源与环境国家重点实验室 江西 南昌 |
| WANG Ting-jian |
东华理工大学核资源与环境国家重点实验室 江西 南昌 |
| XU Ling-ling |
东华理工大学核资源与环境国家重点实验室 江西 南昌 |
| LI Guang-rong |
东华理工大学核资源与环境国家重点实验室 江西 南昌 |
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| Abstract: |
| In order to explore leaching properties of a sandstone-type deposit in Xinjiang and obtain optimal leaching conditions and parameters under different sulfuric acid concentrations, uranium ore was leached in shake flask under different sulfuric acid concentration (0.2—10 g/L) with L/S of 5︰1, temperature of 17 ℃, leaching time of 96 h, and with 300 mg/L or without hydrogen peroxide. The results show that: 1) For the group without hydrogen peroxide, the highest uranium leaching rate is obtained when concentration of sulfuric acid is 8 g/L, whereas it drops to 5.78 mg/L with 10 g/L concentration of sulfuric acid. While acidity is lower than 0.4 g/L, peak value of uranium concentration will appear after 5 hours of leaching and drops later when leaching continues. Leaching almost reaches equilibrium within 48 hours. 2) For the group with hydrogen peroxide, uranium leaching rate is positively correlated with concentration of sulfuric acid, and leaching rate rises with addition of oxidant, but leaching equilibrium point does not change significantly. While the acidity is lower than 0.6 g/L, the uranium concentration decreases in the later stage of leaching. Uranium leaching rate can reach 97.17% when sulfuric acid concentration is 8 g/L. When sulfuric acid concentration rises to 10 g/L, uranium leaching rate does not increase significantly. Therefore, 8 g/L of acidity is the optimal concentration for this uranium deposit. |
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