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| Inverse Modeling of Spatial Evolution of Mineral Dissolution/Precipitation Amounts in Acid In-situ Leaching of Uranium |
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Received:October 01, 2024
Revised:November 07, 2024
Accepted:November 08, 2024
Published Online:February 18, 2025
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| DOI：doi：10.20237/j.issn.1007-7545.2025.02.022 |
| KeyWord:Uranium mining by acid ground leaching; dissolution amount; precipitation (formation) amount; inverse modeling; spatial evolution |
| Author | Institution |
| LIU Xue-feng |
东华理工大学水资源与环境工程学院 |
| LIU Jinhui |
东华理工大学水资源与环境工程学院 |
| XING Yongguo |
中核铀业有限公司 |
| YANG Yihan |
中核内蒙古矿业有限公司 |
| WANG Ruyi |
中核内蒙古矿业有限公司 |
| LIU Yongyi |
东华理工大学水资源与环境工程学院 |
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| Abstract: |
| In the process of in-situ leaching for uranium extraction, not only do uranium minerals dissolve along the leach solution flow path, but significant dissolution of other minerals also occurs, with the quantity of mineral dissolution and precipitation increasing spatially along the leach solution flow direction. This study focused on the pumping unit located in the southern region of the C12 mining area within the Bayan-Ula Uranium Mine, employing an inverse simulation method to investigate the spatial distribution characteristics and patterns of mineral dissolution and precipitation along the leach solution transport pathway. The research findings indicate that during the acid leaching process for uranium extraction, when the leachate runoff reaches 27.10 m, the main minerals dissolved include anorthite (16.95 g.L-1), albite (2.8 g.L-1), potassium feldspar (2.00 g.L-1), hematite (8.74 mg.L-1), and pyrite (7.72 mg.L-1). Minerals prone to precipitation predominantly comprise gypsum (10.8 mg.L-1) and pyrite (7.72 mg.L-1). Furthermore, minerals undergoing both dissolution and precipitation involve gypsum (10.45 g.L-1 of precipitation), while the newly formed minerals primarily consist of illite (13.65 g.L-1) and kaolinite (3.90 g.L-1).The spatial evolution pattern of mineral dissolution and precipitation demonstrates a consistent increase along the leach solution flow path, highlighting the claying alteration of feldspars and the precipitation of gypsum as crucial mechanisms contributing to the blockage of the ore-bearing layer in acid leach uranium mining. |
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