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<p>In order to study the influence of U tailings pond on the downstream river, the distribution, source and speciation of nuclide U and Th from the tailings pond to Linshui river were systematically analyzed by sample collection, mathematical statistics and hydro-geochemical simulation. Through the water chemical characteristics, it is found that SO<sub>4</sub>·Ca type is the water chemical type in the tailings pond area, which changed to HCO<sub>3</sub>·Ca type in the Linshui river. SO<sub>4</sub><sup>2−</sup> is the main anion in the tailings pond, but HCO<sub>3</sub><sup>−</sup> is the main anion in the Linshui river. The concentrations of U and Th decreased significantly with the distance from the tailings pond. After entering the Linshui river, U concentration was relatively stable, while Th concentration was easily concentrated in the upper reaches of the river. The correlation and principal component analysis showed that U, Th, Ni, Zn, and Cd were greatly affected by the tailings pond, and they has the same source. The hydro-geochemical simulation results showed that the speciation of U and Th in tailings pond were mainly UO<sub>2</sub>F<sup>+</sup>, UO<sub>2</sub>F<sub>2</sub> and ThF<sub>3</sub><sup>+</sup>, which were related to F<sup>−</sup> concentration and pH value. In the Linshui river, UO<sub>2</sub>(OH)<sub>2</sub> and UO<sub>2</sub>(CO<sub>3</sub>)<sub>2</sub><sup>2−</sup> increased, and Th(OH)<sub>4</sub> was absolutely dominant speciation. It indicated that pH value and dominant anion were the main controlling factors of U and Th speciation. The results provide the basis data and support for the transformation path of the nuclides in water and the hydro-geochemical process surround U mine.</p>

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The migration characteristics and change in speciation of nuclides U and Th in the downstream river of the uranium tailings pond

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Yuanyuan Liu,
  • Mingqiang Gao,
  • Bai Gao,
  • Jinli Pan,
  • Wenjie Ma,
  • Dandan Huang,
  • Zhijuan Dou,
  • Gongxin Chen

摘要

In order to study the influence of U tailings pond on the downstream river, the distribution, source and speciation of nuclide U and Th from the tailings pond to Linshui river were systematically analyzed by sample collection, mathematical statistics and hydro-geochemical simulation. Through the water chemical characteristics, it is found that SO4·Ca type is the water chemical type in the tailings pond area, which changed to HCO3·Ca type in the Linshui river. SO42− is the main anion in the tailings pond, but HCO3− is the main anion in the Linshui river. The concentrations of U and Th decreased significantly with the distance from the tailings pond. After entering the Linshui river, U concentration was relatively stable, while Th concentration was easily concentrated in the upper reaches of the river. The correlation and principal component analysis showed that U, Th, Ni, Zn, and Cd were greatly affected by the tailings pond, and they has the same source. The hydro-geochemical simulation results showed that the speciation of U and Th in tailings pond were mainly UO2F+, UO2F2 and ThF3+, which were related to F− concentration and pH value. In the Linshui river, UO2(OH)2 and UO2(CO3)22− increased, and Th(OH)4 was absolutely dominant speciation. It indicated that pH value and dominant anion were the main controlling factors of U and Th speciation. The results provide the basis data and support for the transformation path of the nuclides in water and the hydro-geochemical process surround U mine.