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| Hydrogeochemical Mechanism of Ore Bearing Bed Plugging in Bayanwula Uranium Deposit, Inner Mongolia |
| Received:June 16, 2021 Revised:June 18, 2021 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.10.008 |
| KeyWord:ore bearing bed blocking; mineral characteristics; hydrogeochemistry; equilibrium simulation; Bayanwula uranium deposit |
| Author | Institution |
| CHEN Xin-rui |
东华理工大学 |
| LIU Jin-hui |
东华理工大学 |
| XING Yong-guo |
中核矿业科技有限公司 |
| YANG Yi-han |
中核内蒙古矿业有限公司 |
| HU Peng-fei |
中核内蒙古矿业有限公司 |
| WANG Ru-yi |
中核内蒙古矿业有限公司 |
| LIANG Da-ye |
湖南省核工业地质调查院 |
| CHEN Wan-li |
中核矿业科技有限公司 |
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| Abstract: |
| Uranium leaching is realized by a series of hydrogeochemical interactions between leaching solution and uranium minerals. In Bayanwula uranium mine, blockage of ore-bearing strata occurred in acid in-situ leaching. Based on mineral characteristics of ore-bearing bed and chemical components of leachate, leachate - mineral balance was simulated by model of geochemical process PHREEQCI, saturation index of mineral and reaction condition index (RCI) were calculated, mineral dissolution precipitation stat was determined, and hydrogeochemical mechanism of blockage of ore-bearing bed was revealed. The results show that hydrogeochemical reason for blockage of ore-bearing strata is that Ca2+, SO42- and Fe3+ in leaching solution are in supersaturated state, resulting in precipitation of gypsum, goethite and hematite, with saturation index of 0.06—0.20, 0.01—0.83 and 0.94—2.58, respectively. RCICa of gypsum is 0.34—0.42, and RCIS is 1.17—1.35. Ca2+ concentration is main factor affecting solution-precipitation of gypsum. RCIpH (-3.47—-3.27), RCIEh (-599.44—-474.72 mV) and RCIFe (0.96—1.37) of hematite and goethite are all in precipitated state. Precipitation of gypsum and iron minerals is the result that ionic activity product of leaching solution exceeds its solution product constant after interaction between leaching solution and minerals in ore bearing layer. |
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