中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 18 No. 2 April 2008 |
（1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. Department of Electricity and Information Engineering, Hunan International Economics University, Changsha 410205, China;3. School of Civil and Environment Engineering, University of Science and Technology Beijing,Beijing 100083, China;4. Sino Guizhou Jinfeng Mining Limited, Guizhou 550002, China）
Abstract: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 5.70×10−4 mm2 to 1.11×10−3 mm2, 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 mm2 to 2.25×10−2 mm2, 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.
Key words: ore granular media; heap leaching; permeability; CT; image analysis
