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| Analysis of groundwater uranium chemical form and its influencing factors in decommissioned mining area of uranium mine based on PHREEQC simulation |
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Received:April 13, 2024
Revised:May 10, 2024
Accepted:May 13, 2024
Published Online:September 11, 2024
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| DOI： |
| KeyWord:decommissioned uranium mines; U species; mineral saturation index; PHREEQC; geochemical simulation |
| Author | Institution |
| MAN Jia-le |
南华大学 资源环境与安全工程学院 |
| DING Dexin |
南华大学 资源环境与安全工程学院 |
| MA Jianhong |
南华大学 资源环境与安全工程学院 |
| ZHANG Hui |
南华大学 资源环境与安全工程学院 |
| GUO Keer |
南华大学 资源环境与安全工程学院 |
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| Abstract: |
| It is urgent to solve the problem of uranium concentration exceeding the standard in the groundwater after the retirement of the acid in-situ leaching uranium mining area. Therefore, exploring uranium species and its influencing factors is crucial for achieving efficient remediation. In this study, the groundwater of a decommissioned mining area in Xinjiang was taken as an example. The effects of temperature, pH, pe, Fe3+ concentration and Fe2+ concentration on the U species in groundwater and mineral saturation state were simulated by PHREEQC. The results indicated that the dominant chemical forms of U in groundwater are UO2SO4 and UO22+, accounting for 63.43% and 32.54% of the total U content. Secondly, the distribution of U species were influenced by groundwater pH, pe, temperature, Fe2+ concentration, and Fe3+ concentration. Among them, pe was the main controlling factor the valence state of uranium in groundwater. Thirdly, the effects of pH and pe on the saturation state of the minerals are greater, while the effects of temperature, Fe2+ and Fe3+ concentration are less, and the effects of pH and pe on the saturation state of uraninite, schoepite and Fe(OH)3 are the most obvious. Therefore, clarifying the influencing factors of U species in the groundwater of acid in-situ leaching uranium decommissioned mining areas can provide theoretical references for the efficient remediation of uranium contamination in groundwater. |
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