Evolvement of permeability of ore granular media during heap leaching based on image analysis  

作　　者：杨保华 吴爱祥 江怀春 陈学松 

机构地区：[1]School of Resources and Safety Engineering,Central South University [2]School of Civil and Environment Engineering,University of Science and Technology Beijing [3]Sino Guizhou Jinfeng Mining Limited

出　　处：《中国有色金属学会会刊：英文版》2008年第2期426-431,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(2004CB619205)supported by the National Basic Research Program of China;Project(50325415)supported by the National ScienceFund for Distinguished Young Scholars;Project(50574099)supported by the National Natural Science Foundation of China;Project(06B052)supported by Scientific Research Foundation of Hunan Provincial Education Department,China

摘　　要：The column leaching experiment of ore granular media was carried out with the home-made multi-functional experimental apparatus and the pore structure of ore granular media was scanned by the X-ray computed tomography machine before and after leaching.The porosities of each section before and after leaching were calculated based on CT images processing,and the permeability of each zone before and after leaching were also calculated with Carman-Kozeny equation.The permeability evolvement law was disclosed.The results indicate that before leaching the permeability of the ore granular media in different height has not much difference and the value ranges from 5.70×10-4mm 2to 1.11×10 -3mm 2,where the lowest one locates in the bottom zone.After leaching the permeability distributes inhomogeneously along the height of the column and the value ranges from 3.44×10 -4 mm 2 to 2.25×10 -2 mm 2 ,where the lowest one is in the same place.Except for the bottom zone,the permeability of other zones increases after leaching,especially the top zone.Through comparison of the permeability at bottom zone before and after leaching,the whole permeability after leaching decreases by 39.65%that coincides with the measured experimental data.The column leaching experiment of ore granular media was carried out with the home-made multi-functional experimental apparatus and the pore structure of ore granular media was scanned by the X-ray computed tomography machine before and after leaching. The porosities of each section before and after leaching were calculated based on CT images processing, and the permeability of each zone before and after leaching were also calculated with Carman-Kozeny equation. The permeability evolvement law was disclosed. The results indicate that before leaching the permeability of the ore granular media in different height has not much difference and the value ranges from 5.70× 10^-4mm^2 to 1.11 × 10^-3 mm^2, where the lowest one locates in the bottom zone. After leaching the permeability distributes inhomogeneously along the height of the column and the value ranges from 3.44 × 10^4 mm^2 to 2.25 × 10^-2 mm^2, where the lowest one is in the same place. Except for the bottom zone, the permeability of other zones increases after leaching, especially the top zone. Through comparison of the permeability at bottom zone before and after leaching, the whole permeability after leaching decreases by 39.65% that coincides with the measured experimental data.

关 键 词：渗透性 图象分析技术 堆摊浸出 冶金技术 

分 类 号：TF803.21[冶金工程—有色金属冶金]