铀尾矿堆黏土覆盖治理数值模拟研究
|
摘要
根据铀尾矿堆中放射性核素氡迁移特性,建立覆盖情况下铀尾矿堆氡迁移模型,创新性地使用COMSOL multiphysics软件对覆盖层中氡浓度分布进行可视化数值模拟,采用正交试验对结果进行了分析,并采用RAD7测氡仪分两组实地测量某铀尾矿堆黏土覆盖后的氡浓度。结果表明,采用黏土覆盖时,覆盖层厚度1 m,孔隙率0. 30比较经济合理,黏土参数最佳水平组合为:扩散系数0. 8×10~(-6)m~2/s,孔隙率0. 30,覆盖材料密度1 850 kg/m~3,渗透率20×10~(-12)m~2,吸附系数0. 82 L/kg。研究使用COMSOL multiphysics软件进行可视化数值模拟,开拓了尾矿堆治理的研究思路,具有重要的理论和实际意义。
According to the radonuclide migration characteristics of uranium tailing pile,a radon migration model of uranium tailing pile under the coverage condition was established. The radiative radon concentration distribution in the overburden was visualized by COMSOL multiphysics software,the results were analyzed by orthogonal experimental design and RAD7 radonometer was applied to measure the radon concentration of a certain uranium tailing clay in two groups on the spot. The results show that the thickness of the coverage layer is 1m and the porosity is 0. 30 when covering with clay. The optimum combination of clay parameters is as follows: the diffusion coefficient is 0. 8 × 10~(-6)m~2/s,the porosity is 0. 30,the covering material density is 1 850 kg/m~3,the permeability is 20 × 10~(-12)m~2,and the adsorption coefficient is 0. 82 L/kg. The COMSOL multiphysics software is used to carry out visual numerical simulation,Which has opened up the research ideas of tailing pile harnessing and has important theoretical value and practical significance for tailing pile harnessing.
According to the radonuclide migration characteristics of uranium tailing pile,a radon migration model of uranium tailing pile under the coverage condition was established. The radiative radon concentration distribution in the overburden was visualized by COMSOL multiphysics software,the results were analyzed by orthogonal experimental design and RAD7 radonometer was applied to measure the radon concentration of a certain uranium tailing clay in two groups on the spot. The results show that the thickness of the coverage layer is 1m and the porosity is 0. 30 when covering with clay. The optimum combination of clay parameters is as follows: the diffusion coefficient is 0. 8 × 10~(-6)m~2/s,the porosity is 0. 30,the covering material density is 1 850 kg/m~3,the permeability is 20 × 10~(-12)m~2,and the adsorption coefficient is 0. 82 L/kg. The COMSOL multiphysics software is used to carry out visual numerical simulation,Which has opened up the research ideas of tailing pile harnessing and has important theoretical value and practical significance for tailing pile harnessing.
引文
[1]潘英杰.浅谈俄罗斯铀废石场尾矿库退役治理的安全环保标准[J].铀矿冶,2016,35(2):118-123.
[2]张叶,张雄杰,覃国秀.某铀矿山废石堆场氡污染调查[J].铀矿地质,2017,33(3):174-177.
[3]FAN N B,YE Y J,LI Zh,et al. Theoretical study on the radon exhalation in the uranium tailings backfill[J]. Journal of Safety&Environment,2015,15(2):236-239.
[4]Barbosa S M,Lopes F,Correia A D,et al. Temporal variability of radon in a remediated tailing of uranium ore processing-the case of Urgeirica(Central Portugal)[J].Journal of Environmental Radioactivity,2015,142:14-23.
[5]Ongori J N,Lindsay R,Newman R T,et al. Determining the radon exhalation rate from a gold mine tailings dump by measuring the gamma radiation[J]. J Environ Radioact,2015,140:16-24.
[6]Kozlowska B,Mazur J,Kozak K,et al. Investigation of the influence of chamber construction parameters on radon exhalation rate[J]. Nukleonika,2016,61(3):917-919.
[7]LI Z Q,XIAO D T,ZHAO G Z,et al. Research of portable automatic measuring monitor of radon exhalation rate[J].Atomic Energy Science&Technology,2016,50(2):357-362.
[8]ZHANG L,GUO Q,SUN K. Continuous measurement of radon exhalation rate of soil in Beijing[J]. Journal of Radioanalytical&Nuclear Chemistry,2015,303(2):1623-1627.
[9]LI Y M,TAN W,TAN K,et al. Fractal and chaos analysis for dynamics of radon exhalation from uranium mill tailings[J]. Fractals-complex Geometry Patterns&Scaling in Nature&Society,2016,24(3):165-169.
[10]ZHANG Z,LI XY,DENG W,et al. The experimental research on the impact of temperature on porous medium emanation radon exhalation[J]. Industrial Safety&Environmental Protection,2016,42(6):30-32.
[11]ZHOU F R,YANG S N,HUANG X Y,et al. Research on the effect of covering soil thickness on radon exhalation rate andγ-radiation of slag muck[J]. Acta Geologica Sichuan,2015,35(4):614-617.
[12]戴剑勇,汪敏,邹树梁.铀尾矿堆覆盖材料混合智能优化选择研究[J].原子能科学技术,2016,50(7):1329-1335.
[2]张叶,张雄杰,覃国秀.某铀矿山废石堆场氡污染调查[J].铀矿地质,2017,33(3):174-177.
[3]FAN N B,YE Y J,LI Zh,et al. Theoretical study on the radon exhalation in the uranium tailings backfill[J]. Journal of Safety&Environment,2015,15(2):236-239.
[4]Barbosa S M,Lopes F,Correia A D,et al. Temporal variability of radon in a remediated tailing of uranium ore processing-the case of Urgeirica(Central Portugal)[J].Journal of Environmental Radioactivity,2015,142:14-23.
[5]Ongori J N,Lindsay R,Newman R T,et al. Determining the radon exhalation rate from a gold mine tailings dump by measuring the gamma radiation[J]. J Environ Radioact,2015,140:16-24.
[6]Kozlowska B,Mazur J,Kozak K,et al. Investigation of the influence of chamber construction parameters on radon exhalation rate[J]. Nukleonika,2016,61(3):917-919.
[7]LI Z Q,XIAO D T,ZHAO G Z,et al. Research of portable automatic measuring monitor of radon exhalation rate[J].Atomic Energy Science&Technology,2016,50(2):357-362.
[8]ZHANG L,GUO Q,SUN K. Continuous measurement of radon exhalation rate of soil in Beijing[J]. Journal of Radioanalytical&Nuclear Chemistry,2015,303(2):1623-1627.
[9]LI Y M,TAN W,TAN K,et al. Fractal and chaos analysis for dynamics of radon exhalation from uranium mill tailings[J]. Fractals-complex Geometry Patterns&Scaling in Nature&Society,2016,24(3):165-169.
[10]ZHANG Z,LI XY,DENG W,et al. The experimental research on the impact of temperature on porous medium emanation radon exhalation[J]. Industrial Safety&Environmental Protection,2016,42(6):30-32.
[11]ZHOU F R,YANG S N,HUANG X Y,et al. Research on the effect of covering soil thickness on radon exhalation rate andγ-radiation of slag muck[J]. Acta Geologica Sichuan,2015,35(4):614-617.
[12]戴剑勇,汪敏,邹树梁.铀尾矿堆覆盖材料混合智能优化选择研究[J].原子能科学技术,2016,50(7):1329-1335.