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| Study on Citric Acid Leaching Performance and Uranium Form of Hard-rock Uranium Ore |
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Received:June 10, 2021
Revised:June 13, 2021
Accepted:June 15, 2021
Published Online:July 29, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.08.010 |
| KeyWord:uranium ore; citric acid; uranyl citrate; PHREEQC |
| Author | Institution |
| XU Ling-ling |
东华理工大学 核资源与环境国家重点实验室 |
| ZHANG Yi-nuo |
东华理工大学 水资源与环境工程学院 |
| ZHOU Yi-peng |
东华理工大学 核资源与环境国家重点实验室 |
| LIU Sha-sha |
东华理工大学 水资源与环境工程学院 |
| CAI Jia-yi |
东华理工大学 水资源与环境工程学院 |
| TONG Min-jie |
东华理工大学 水资源与环境工程学院 |
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| Abstract: |
| Test of citric acid leaching was performed on hard-rock uranium ore. The results show that uranium concentration is 208 mg/L after 120 h of leaching with 0.1 mol/L citric acid, and uranium leaching rate is 41.2%, 37.5 percent points higher than that with dilute sulfuric acid (pH=2.0) leaching. In addition, after reaching acid-base equilibrium, citric acid and uranium ore show significant complexation. Form of [FeUO2OHCit]+ from combination of uranyl citrate with Fe3+ accounts for 62.18%, being the dominant form in leachate. Affinity to Fe3+ is favorable for oxidative leaching of U(Ⅳ) in uranium ore. [UO2H2Cit]+, [UO2H2CitH3Cit]+, [UO2H2Cit(H3Cit)2]+, [UO2H2CitH2O]+, [(UO2H2Cit)2H3Cit]2+ and other forms are detected by mass spectrum. During leaching, CaCO3 saturation index (SI) remains negative, indicating its unsaturated state, therefore not easy to precipitate. It is feasible to leach hardrock uranium ore with citric acid. |
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