Abstract
In order to explore the influence factors of permeability during heap leaching of Yangla copper ore in China, falling head permeability test was applied to draw a comparison between the permeability of various samples, and then permeability evolutionary law of the sample ore from leaching heap was analyzed under different ore size or compaction degree. Finally, acid leaching experiments was carried out to reveal the influential mechanism of heap blockage on its permeability. The data show that the permeability coefficient of washed ore is 12.7 times than that of raw ore; permeability coefficient with the compaction degree 38.3% is only 3.78% of that in natural state; Chemical blockage brings about a fall of permeability coefficient by 93.5%, and earlier physical blockage leads to the decrease of it by 43.2%. Results show that much argillaceous fine particles in ore heap with high mud content can result in decreased permeability coefficient; and permeability coefficient of the samples decreases significantly with increased compaction degree. In addition, chemical blockage is the main reason for penetration deterioration.
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