摘要
为研究温度、压力对铀尾矿堆中放射性核素氡迁移扩散的影响,通过构建温度-压力耦合作用下氡迁移的动力学模型,运用COMSOL数值模拟软件的可视化处理技术分析不同状态下铀尾矿堆中氡浓度和气体压力分布情况。结果表明:在一定时间范围内,氡慢慢扩散到铀尾矿堆上部,使氡浓度在靠近上边界的一定区域内逐渐增大最终趋于稳定,氡浓度随扩散位移的增加而增大。与理想状态相比,在压力、温度的共同作用下,加速了铀尾矿堆表面氡的析出,从而使铀尾矿堆上部氡浓度的最大值相对小,堆体内氡浓度达到稳态的时间相对短。温度加快了铀尾矿堆内气体压力的变化,从而加快了对流速度,最终促进了氡的迁移。该研究为铀尾矿堆放射性污染的治理提供有效理论依据。
In order to study the influence of temperature and pressure on the migration and diffusion of radionuclide Rn in uranium tailings,the dynamic model of Rn migration under temperature-pressure coupling was established,and the distribution of Rn concentration and gas pressure in tailings stockpile under different conditions were analyzed by using the visualization processing technology of COMSOL numerical simulation software.The results show that within certain time,Rn slowly diffuses to the upper part of the tailings stockpile,so that the Rn concentration gra-dually increases in a certain range near the upper boundary and finally tends to be stable,and the Rn concentration and displacement increase linearly.In ideal state,under the influence of pressure and temperature,Rn on the surface of uranium tailings stockpile separates out more quickly,so that the maximum Rn concentration in the upper part of tailings stockpile is relatively low,the time for Rn concentration in tailings stockpile to reach steady state is relatively short.Temperature accelerates the change of gas pressure,thus accelerating convection speed and finally promoting the migration of Rn.Study on the migration and diffusion rule of Rn in tailings stockpile under the coupling effect of temperature and pressure provides effective theoretical basis for the treatment of uranium tailings stockpile radioactive pollution.
作者
田亚坤
张志军
郭要辉
王仲辉
汪敏
Tian Yakun;Zhang Zhijun;Guo Yaohui;Wang Zhonghui;Wang Min(School of Resource Environment and Safety Engineering,University of South China;Hunan Province Engineering Technology Research Center for Disaster Prediction and Control on Mining Geotechnical Engineering,University of South China;School of Civil and Resource Engineering,University of Science and Technology Beijing)
出处
《黄金》
CAS
2020年第12期81-85,共5页
Gold
基金
国家自然科学基金资助项目(51774187,51804164)
湖南省自然科学基金项目(2019JJ50498)
湖南省教育厅科研基金(17A184)
湖南省研究生科研创新项目(CX20200919)
湖南省矿山岩土工程灾害预测与控制工程技术研究中心项目(2019TP2070)。
关键词
铀尾矿堆
多场耦合
氡
扩散迁移
温度
压力
uranium tailings stockpile
multi-field coupling
Rn
diffusion migration
temperature
pressure
