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| Simulation on CaCO3 Precipitation and Blockage Conditions in CO2+O2 In-situ Leaching of Uranium |
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Received:April 11, 2023
Revised:April 15, 2023
Accepted:April 18, 2023
Published Online:July 10, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.08.008 |
| KeyWord:CO2+O2 in-situ leaching of uranium; CaCO3 precipitation; blockage of the ore-bearing seam; saturation index; boundary value; Nalinggou uranium mine |
| Author | Institution |
| YANG Shi-qi |
东华理工大学 |
| LIU Jin-hui |
东华理工大学 |
| YANG Yi-han |
中核内蒙古矿业有限公司 |
| LI Peng |
中核内蒙古矿业有限公司 |
| ZHANG Chuan-fei |
中核内蒙古矿业有限公司 |
| LI Guang-hui |
中核内蒙古矿业有限公司 |
| XU Qi |
中核内蒙古矿业有限公司 |
| CHEN Ting |
东华理工大学 |
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| Abstract: |
| CO2+O2 in-situ leaching of uranium process is the third generation of uranium mining and metallurgical technology in China, during the in-situ leaching process, the dissolved liquid reacts with the ore-bearing seam minerals to extract uranium from the ore, at the same time, chemical precipitation will occur due to the increase of groundwater mineralization, resulting in ore-bearing seam blockage. CaCO3 precipitation is an important cause of ore layer blockage during in uranium leaching in CO2+O2. In order to explore the conditions of CaCO3 precipitation and blockage, hydrogeochemical conditions of ore-bearing seam blockage were systematically studied through hydrogeochemical simulation, according to the chemical composition data of CO2+O2 uranium leaching solution from uranium ore in Nalinggou in Inner Mongolia The results show that CaCO3 precipitation is the important cause of chemical blockage of ore-bearing seams in CO2+O2 in-situ leaching of uranium. When the pH value of the leaching solution 6.5 above, CaCO3 will precipitate, the pH value, concentration of HCO3- and Ca2+ of the immersion solution are the main factors affecting CaCO3 precipitation, and excessive pH value and concentration of HCO3- and Ca2+ will cause the production of CaCO3 precipitation. According to the simulation results, the relationship between pH value, and concentrations of HCO3- and Ca2+ without CaCO3 precipitation is obtained, and it is concluded that maintaining the lower Ca2+ concentration and lower pH value of the leaching solution is an effective way to prevent and alleviate CaCO3 precipitation blockage. |
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