抽注互换对低渗夹层分布采区的铀浸出改进效果研究OA

Uneven and discontinuous calcareous sandstone and mudstone interlayers are distributed in the mining area of Bayin Qinggeli uranium mine.In order to explore the influence of low-permeability interlayers on uranium leaching effect,a three-dimensional unstructured grid lithology model of ore-bearing aquifer was constructed based on borehole data in the test mining area,and the flow field and solute transport process of in-situ leaching uranium under different extraction-injection methods were simulated.By introducing a matrix calculation method based on the actual extraction-injection flow of group wells,the solute mass ratio and natural groundwater content were quantitatively compared and analyzed.The results show that compared with the original extraction-injection method,after the extraction-injection methods of SYC-1 and SYZ-1 wells are interchanged,the range of groundwater drawdown funnel is reduced,the capture ability of pumping wells to leaching solution is significantly improved,the mass ratio of extracted and injected solute is increased by 1.7 times,the natural groundwater content in pumping volume is reduced by 29.4％,the hydraulic connection between extraction-injection wells is stronger,and the leaching effect is better than that of the original extraction-injection method.Calcareous sandstone and mudstone interlayers significantly hinder the hydraulic connection between extraction-injection wells,resulting in significantly different leaching effects of different extraction-injection methods.