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<p>X-ray computed tomography (XCT) and lattice Boltzmann method (LBM) flow simulation have been used to investigate pore structure and fluid flow in leach columns. Because of the heterogeneous structure inside leach column, the selection of regions of interest (ROI) for XCT study of leach column is important. At 67&#xa0;μm voxel size, 4-inch diameter column was scanned in two parts and then stitched to generate a combined 3D image with a length of 8.2&#xa0;cm. Two columns with similar particle size distributions (PSD) were compared for two short stacks and one combined long stack cut from the center of column. Column A contained relatively more fines, which showed more volume of small pores and less permeability. The difference between short stacks (smaller ROI) and long stack (larger ROI) were not significantly different, but the larger volume did allow the retention of pore features between the two short stacks. The comparison between center ROI and wall ROI of leach column revealed a clear quantitative and visual presentation of the “wall effect”. The wall ROI showed at least twice porosity and simulated permeability over the center ROI.</p>

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Importance of the ROI Volume and Location in 3D Characterization of 4-inch Leach Columns by X-ray Computed Tomography

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Jiazhen Liu,
  • Jiaqi Jin,
  • Rosalia Jaramillo,
  • Aaron S. Young,
  • Pratt W. Rogers

摘要

X-ray computed tomography (XCT) and lattice Boltzmann method (LBM) flow simulation have been used to investigate pore structure and fluid flow in leach columns. Because of the heterogeneous structure inside leach column, the selection of regions of interest (ROI) for XCT study of leach column is important. At 67 μm voxel size, 4-inch diameter column was scanned in two parts and then stitched to generate a combined 3D image with a length of 8.2 cm. Two columns with similar particle size distributions (PSD) were compared for two short stacks and one combined long stack cut from the center of column. Column A contained relatively more fines, which showed more volume of small pores and less permeability. The difference between short stacks (smaller ROI) and long stack (larger ROI) were not significantly different, but the larger volume did allow the retention of pore features between the two short stacks. The comparison between center ROI and wall ROI of leach column revealed a clear quantitative and visual presentation of the “wall effect”. The wall ROI showed at least twice porosity and simulated permeability over the center ROI.