Use of high-resolution X-ray computed tomography and 3D image analysis to quantify mineral dissemination and pore space in oxide copper ore particles
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第9期
论文作者：Bao-hua Yang Ai-xiang Wu Guillermo A.Narsilio Xiu-xiu Miao Shu-yue Wu
文章页码：965 - 973
摘 要：Mineral dissemination and pore space distribution in ore particles are important features that influence heap leaching performance. To quantify the mineral dissemination and pore space distribution of an ore particle, a cylindrical copper oxide ore sample（Φ4.6 mm × 5.6 mm） was scanned using high-resolution X-ray computed tomography（HRXCT）, a nondestructive imaging technology, at a spatial resolution of 4.85 μm. Combined with three-dimensional（3D） image analysis techniques, the main mineral phases and pore space were segmented and the volume fraction of each phase was calculated. In addition, the mass fraction of each mineral phase was estimated and the result was validated with that obtained using traditional techniques. Furthermore, the pore phase features, including the pore size distribution, pore surface area, pore fractal dimension, pore centerline, and the pore connectivity, were investigated quantitatively. The pore space analysis results indicate that the pore size distribution closely fits a log-normal distribution and that the pore space morphology is complicated, with a large surface area and low connectivity. This study demonstrates that the combination of HRXCT and 3D image analysis is an effective tool for acquiring 3D mineralogical and pore structural data.
Bao-hua Yang1,2，Ai-xiang Wu3，Guillermo A.Narsilio2，Xiu-xiu Miao2,3，Shu-yue Wu4
1. Information Science and Engineering School,Hunan International Economics University2. Department of Infrastructure Engineering,The University of Melbourne3. Key Laboratory of High-efficient Mining and Safety of Metal Mines (Ministry of Education),University of Science and Technology Beijing4. Information Science and Engineering School, Hunan International Economics University
摘 要：Mineral dissemination and pore space distribution in ore particles are important features that influence heap leaching performance. To quantify the mineral dissemination and pore space distribution of an ore particle, a cylindrical copper oxide ore sample（Φ4.6 mm × 5.6 mm） was scanned using high-resolution X-ray computed tomography（HRXCT）, a nondestructive imaging technology, at a spatial resolution of 4.85 μm. Combined with three-dimensional（3D） image analysis techniques, the main mineral phases and pore space were segmented and the volume fraction of each phase was calculated. In addition, the mass fraction of each mineral phase was estimated and the result was validated with that obtained using traditional techniques. Furthermore, the pore phase features, including the pore size distribution, pore surface area, pore fractal dimension, pore centerline, and the pore connectivity, were investigated quantitatively. The pore space analysis results indicate that the pore size distribution closely fits a log-normal distribution and that the pore space morphology is complicated, with a large surface area and low connectivity. This study demonstrates that the combination of HRXCT and 3D image analysis is an effective tool for acquiring 3D mineralogical and pore structural data.
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