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首页> 外文期刊>Environmental Science & Technology >Uranium Natural Attenuation Downgradient of an in Situ Recovery Mine Inferred from a Cross-Hole Field Test
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Uranium Natural Attenuation Downgradient of an in Situ Recovery Mine Inferred from a Cross-Hole Field Test

机译：铀天然衰减从交叉孔场测试推断出原位恢复矿的降级降级

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摘要

A field test was conducted at a uranium in situ recovery (solution mining) site to evaluate postmining uranium natural attenuation downgradient of an ore zone. Approximately 1 million liters of water from a previously mined ore zone was injected into an unmined ore zone that served as a proxy for a downgradient aquifer, while a well located approximately 23 m away was pumped. After 1 year of pumping, only about 39% of the injected U(VI) was recovered, whereas essentially 100% of coinjected chloride was recovered. A geochemical/transport model was used to simultaneously match the chloride and uranium concentrations at the pumping well while also qualitatively matching aqueous U-238/U-235 ratios, which reflect uranium removal from solution by reduction. It was concluded that similar to 50% of the injected U(VI) was reduced to U(IV), although the reduction capacity in the flow pathways between the injection and production wells was estimated to be nearly exhausted by the end of the test. Estimating the reduction capacity of the downgradient aquifer can inform restoration strategy and offer a useful metric for regulatory decisions concerning the adequacy of restoration. U(VI) reduction should be effectively irreversible in these anoxic environments, which differ greatly from shallow oxic environments where U(IV) is readily reoxidized.
机译：在原位恢复（溶液采矿）位点的铀的野星测试中进行，以评估矿区的后期铀天然衰减降级。从先前开采的矿石区的大约100万升水喷射到一个未绕装矿区，作为降级含水层的代理，距离大约23米的井被泵送。在泵送1年后，回收了约39％的注射U（VI），而基本上100％回收氯化物。使用地球化学/传输模型同时将氯化物和铀浓浓度与泵送井同时匹配，同时也定性匹配U-238 / U-235比率，这通过还原反射从溶液中除去铀。得出结论，类似于将50％的注射U（VI）还原为U（IV），尽管注射和生产井之间的流动途径中的还原能力估计在测试结束时几乎耗尽。估算降级含水层的降低能力可以为恢复策略提供信息，并提供有关恢复充分性的监管决策的有用度量。减少u（vi）在这些缺氧环境中应该有效地不可逆转，这极大地从浅氧环境易于再氧化。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7483-7493|共11页
  • 作者

    Reimus Paul W.; Dangelmayr Martin A.; Clay James T.; Chamberlain Kevin R.;

  • 作者单位

    Los Alamos Natl Lab POB 1663 Los Alamos NM 87545 USA;

    Los Alamos Natl Lab POB 1663 Los Alamos NM 87545 USA;

    Cameco Resources Inc 762 Ross Rd Douglas WY 82633 USA;

    Univ Wyoming Dept Geol & Geophys 1000 East Univ Ave Dept 3006 Laramie WY 82071 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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