地浸铀矿山退役采区地下水中铀种态的PHREEQC模拟研究
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南华大学资源环境与安全工程学院

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国家自然科学基金重点项目( U1967210);湖南省教育厅优秀青年项目 (20B510)


PHREEQC simulation of uranium species in groundwater of decommissioned mining area of in-situ leaching uranium mine
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School of Resources,Environment and Safety Engineering,University of South China,Hengyang

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    摘要:

    本文选取我国西北某地浸铀矿山退役采区地下水作为研究对象,通过实地调查和取样分析,研究了该区地下水中铀含量和其它理化性质。采用地球化学模型PHREEQC计算该区水环境中铀的赋予形态并通过改变模拟条件模拟铀的形态在不同pH、温度、SO42-浓度和NO3-浓度下的影响。结果表明,该区地下水铀的价态接近100%为U(Ⅵ),其形态主要以UO2SO4、UO22+、UO2(SO4)22-和UO2NO3+的形式存在,占比分别为72.0%、20.7%、7.2%、0.1%。通过模拟得出:当pH=2~5时,UO2SO4一直是该水环境中的优势种态,随着pH值的持续增高,UO2(OH)2显著增加并在pH=5之后成为优势种态;当温度在10~40℃范围内时,UO2SO4始终是该水环境中的优势种态,随着温度升高,UO2SO4含量也缓慢升高;随着SO42-浓度的降低UO2SO4会减少,当SO42-浓度低至0.005 mol/L后UO22+成为优势种态;随着NO3-浓度的降低UO2NO3+会缓慢减少,但其中的优势种态依然为UO2SO4。

    Abstract:

    In this paper, the groundwater in the decommissioned mining area of an in-situ leaching uranium mine in Northwest China is selected as the research object. Through field investigation and sampling analysis, the content of uranium and other physical and chemical properties in groundwater are studied. The geochemical model PHREEQC is used to calculate the given form of uranium in the water environment of this area, and the influence of uranium form under different pH, temperature, SO42- concentration and NO3- concentration is simulated by changing the simulation conditions. The results show that the valence state of uranium in groundwater in this area is nearly 100% U(Ⅵ), and its forms mainly exist in the forms of UO2SO4, UO22+, UO2(SO4)22- and UO2NO3+, accounting for 72.0%, 20.7%, 7.2% and 0.1% respectively. The simulation results show that when pH=2~5, UO2SO4 has always been the dominant species state in the water environment. With the continuous increase of pH value, UO2(OH)2 increases significantly and becomes the dominant species state after pH=5; When the temperature is in the range of 10~40℃, UO2SO4 is always the dominant species in the water environment. With the increase of temperature, the content of UO2SO4 also increases slowly; With the decrease of SO42- concentration, UO2SO4 will decrease. When the SO42- concentration is as low as 0.005 mol/L, UO22+ becomes the dominant species; With the decrease of NO3- concentration, UO2NO3+ will decrease slowly, but the dominant species state is still UO2SO4.

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  • 收稿日期:2022-05-12
  • 最后修改日期:2022-05-12
  • 录用日期:2022-05-27
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