基于数值模拟研究酸法地浸采铀过程中孔隙度时空演化

地浸采铀过程中常伴随生成化学沉淀,影响铀的浸出效率。为了揭示化学沉淀出现的时间和位置规律,在溶浸液相同的情况下,对含矿层孔隙度的时空演化进行了数值模拟。模拟结果显示:0～5d,模拟区从距离注液孔2.6～20m处均有孔隙度—渗透性增大(化学溶解)的现象;第5天之后,整个模拟区均出现了不同程度的孔隙度—渗透性减小(化学沉淀)的现象。模型运行到设定的最长时间(550d)时,在模型紧邻注液孔的位置孔隙度减小了25.7%,在模型紧邻抽液孔的位置孔隙度减小了15.13%。

Spatial-temporal Evolution of Porosity during In-situ Acid Leaching of Uranium Based on Numerical Simulation

Chemical precipitation often occurs during in-situ uranium mining, which affects uranium leaching efficiency. In order to illustrate time and position law of chemical precipitation, spatiotemporal evolution of ore-bearing porosity was numerically simulated under the same conditions of leaching solution. The simulation results show that the 0-5 day simulation zone has porosity-permeability enlargement (chemical dissolution) from 2.6-20 m to injection hole; after the fifth day, the entire simulation zone appears as varying degrees of porosity-permeability reduction (chemical precipitation). When the model was run to the set maximum time (550 days), porosity of model droped by 25.7% in immediate vicinity of injection hole; while porosity of model droped by 15.13% near pumping hole.