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采用核磁共振成像技术对柱浸渗流过程进行非接触、无损探测,得到溶液静止和流动时的核磁共振图像.通过对速度值分布的分析,评价了速度场均匀性,得到了均匀性指数与喷淋强度的关系,进而研究了细观渗流速度场分布特性和孔隙内速度场演化规律.研究表明:流速分布具有明显的不均匀性,流速值与孔隙大小并不严格一致;不同喷淋强度下速度值分布趋势相似,最大流速与喷淋强度正相关;通过分析速度场均匀性与喷淋强度间关系可得到喷淋强度阈值,实验中0.7 L·cm-2·h-1为此粒级级配的喷淋强度阈值.现场应用动态喷淋强度可明显改善堆场的渗透性,提高铜的浸出率.
Nuclear Magnetic Resonance Imaging (NMR) was used to conduct non-contact and non-destructive detection of the column infiltration process, and the NMR images were obtained when the solution was still and flowing.Through the analysis of velocity distribution, the uniformity of velocity field was evaluated and the uniformity index And then the relationship between the velocity distribution and the evolution of the velocity field in the pore was studied.The results show that the velocity distribution has obvious inhomogeneity and the velocity value is not strictly consistent with the pore size. The distribution of velocity values is similar, and the maximum flow velocity is positively correlated with the spray intensity. The spray intensity threshold can be obtained by analyzing the relationship between velocity field uniformity and spray intensity. In this experiment, 0.7 L · cm -2 · h -1 Grading spray intensity threshold.Application of dynamic spraying site strength can significantly improve the yard permeability and improve the leaching rate of copper.