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The bacteria column leaching experiment of low grade sulphide ore was conducted and the ore granular media were scanned by X-ray computerised tomography scanner before and after leaching. Based on the image processing operation, the spatial distribution of the porosity, and the change of pore size distribution and connectivity before and after leaching were investigated. In addition, the mechanism of pore evolution during leaching was also analysed. The results indicate that the porosity, pore size and pore connectivity of the ore granular media during leaching all have spatial and temporal variability. After leaching, the porosity distribution along the column became more inhomogeneous and assumes a decreasing trend from top to bottom, especially the bottom zone, with porosity decreasing greatly. The amount of larger pores increased at the top and middle zones after leaching while decreased at bottom zone. The connectivity of the top and middle zone was improved but deteriorated at the bottom zone. The main mechanisms for pore evolution are the subsidence of the entire granular ore body and the transportation and accumulation of the fine particles, chemical precipitates and colloidal substance at local areas.

The Analysis of the Pore Evolution of Ore Granular Media During Bacteria Heap Leaching Based on X-Ray Computerised Tomography