考虑沉淀-溶解反应动力学的酸法地浸采铀孔隙度时空演化

为了研究沉淀-溶解反应动力学在酸法地浸采铀过程中对孔隙度时空演化的影响,利用数值模拟方法 ,对比动力学反应与平衡反应中孔隙度演化情况。结果表明:1)动力学参数不仅可以在水文地球化学过程中体现时间尺度,同时也有利于溶质运移过程中化学反应的均匀进行;2)溶质运移过程的化学反应时间尺度、动力学考虑了反应速率和活化能等因素使得在水文地球化学过程的平衡不是瞬时完成;3)与平衡反应不同,出现化学沉淀的位置是沿着注液孔不断推移,动力学反应出现化学沉淀的位置是从注液孔不断前移到抽液孔。动力学反应研究不仅可以描述水文地球化学作用的结果,对于水文地球化学过程的研究也更加有意义。

Spatiotemporal Evolution of Porosity of Uranium Leaching Considering Reaction Kinetics of acid Precipitation-Dissolution

In order to study the effect of precipitation-dissolution reaction kinetics on the spatiotemporal evolution of porosity in the process of acid leaching of uranium mining, the porosity evolution in kinetic reaction and equilibrium reaction was compared by numerical simulation method. The simulation results show that: 1) The kinetic parameters can not only embody the time scale in the hydrogeological process, but also facilitate the uniform chemical reaction in the process of solute migration, 2) the time scale and kinetics of the chemical reaction during the solute migration process takes into factors such as reaction rate and activation energy so that the equilibrium in the hydrogeological process is not completed instantaneously; 3) The location of chemical precipitation is different from that of the equilibrium reaction, and the position of chemical precipitation in the kinetic reaction is continuously moving along the injection hole to the pumping hole. In the kinetic reaction, not only describe the results of hydrogeochemical effects can be described, but also the study of hydrogeochemical processes is more meaningful.