水浸颗粒堆积型射气介质氡析出规律的理论研究

发布时间：2018-09-03 17:32

【摘要】：铀尾矿库和地表浸铀铀矿堆是一种颗粒堆积型射气介质,其水位的变化和覆水厚度对氡迁移与析出的影响不容忽视。为揭示这类介质表面氡析出的规律,本文基于菲克定律和气液两相界面氡的传输理论,建立了水浸颗粒堆积型射气介质氡的一维传输-扩散数学模型,并获得稳态条件下气液两相体系中氡浓度分布的解析解和氡析出率的计算公式。通过研究,获得以下结论:1)水位为0m时,颗粒堆积型射气介质表面氡析出率随介质厚度的增大而增大,其增长率随厚度的增大而减小;2)介质表面氡析出率随水位的增大先增大后减小;3)当水体高度大于射气介质厚度时,覆水表面氡析出率随覆水厚度的增大而减小,随覆水氡扩散系数的增大而增大。
[Abstract]:Uranium tailings reservoir and surface uranium ore heap are a kind of granular accumulative aeration medium. The effects of water level change and overlying water thickness on radon migration and precipitation can not be ignored. In order to reveal the law of radon exhalation on the surface of this kind of medium, based on Fick's law and the radon transport theory of gas-liquid two-phase interface, a one-dimensional transmission-diffusion mathematical model of radon in water-immersed granular accumulative gas medium is established in this paper. The analytical solution of radon concentration distribution and the formula of radon exhalation rate in gas-liquid two-phase system are obtained. Through the study, the following conclusions are obtained: when the water level is 0 m, the radon exhalation rate increases with the increase of the thickness of the medium. The radon exhalation rate on the surface of overlying water decreases with the increase of overlying water thickness when the water height is greater than the thickness of the aerated medium, and then decreases with the increase of water level. The radon diffusion coefficient of overlying water increases with the increase of radon diffusion coefficient.
【作者单位】：南华大学环境保护与安全工程学院;南华大学铀矿冶生物技术国防重点学科实验室;
【基金】：国家自然科学基金资助项目(11105069,11575080)
【分类号】：X75;X591

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