地浸采铀注氧作业的气泡行为与流型演变研究OA

In the oxygen injection process of"CO2+O2"in-situ leaching uranium,oxygen is prone to bubble coalescence and flow regime deterioration during long distance transportation,which in turn induces gas blockage,resulting in intermittent liquid injection,and decrease in leaching efficiency.To reveal the mechanism by which bubble size evolution regulates flow stability,this study designed a vi-sualization experimental system for static mixers used in in-situ leaching uranium.Particle shadow ve-locimetry(PSV)was employed in combination with multi-stage image processing techniques—inclu-ding Gaussian filtering,adaptive threshold segmentation,and morphological reconstruction.To achieve high resolution in-situ observation of micro bubble size,distribution and dynamic behavior.The results show that as oxygen concentration increase from 15 mg/L to 700 mg/L,microbubble diameter(d50)rise from 528 μm to 823 μm.Conversely,increasing water flow rate from 0.5 m3/h to 2.0 m3/h,microbubble diam-eter(d50)reduce from 945 μm to 412 μm,indicating significantly enhance dispersion capability.With rising oxygen concentration,the flow patterns evolve sequentially from fog flow,through bubble flow and transition flow,to slug flow.In the slug flow pattern,the big bubbles periodically collapse,lead-ing to frequent gas blockage issues on-site.This study demonstrates that the proposed image process-ing method provides highly reliable data for microbubble size distribution,coalescence frequency,and flow pattern identification,offering a solid foundation for process optimization and control of oxygen injection in in-situ leaching uranium.