铀迁移的一维弥散方程数学模型及实验研究

The Mathematical Model of One-dimensional Dispersion Equation and Experimental Research of Uranium Migration

通过本次研究,建立了铀迁移的一维数学模型,并解出了理论解。由于研究的铀是放射性元素,则在溶解和沉淀的同时,还存在自身的衰变;除对流与水动力弥散作用外,能引起控制体内溶质质量变化的其他一切因素,都补充到弥散方程中去。设计了铀迁移一维弥散试验装置,用以摸拟砂岩铀矿过程中铀的迁移。当试验进行9h后,实验柱30 cm以前的铀全部还原沉淀,11h后60 cm以前的铀被还原,130 cm处的铀没有被还原。将实验结果和铀成矿的实测剖面进行了对比,讨论了产生误差的原因,为下一步进行三维模拟打下了基础。

The one-dimensional mathematical model of uranium migration was established through this research;And solve a theoretical solution;Since the Uranium is the radioactive element, dissolution, precipitation and own decay in the same time;In addition to the role of convection and hydrodynamic dispersion, all other factors which caused changes of the quality control are added to the dispersion equation. The one-dimensional diffusion of uranium migration experiments was designed,Which simulates uranium migration of uranium mineralization;all the previous uranium restore inner 30 cm after 9 h, 11 h after the uranium is reduced to the previous 60 cm, 130 cm at the uranium is not restored. And were compared to the measured profile of uranium mineralization, discussed the cause of the error, it is the basis of three-dimensional simulation for the next step.