作者: Nenad Djordjevic
DOI: 10.1016/J.MINENG.2014.06.003
关键词:
摘要: Abstract Assuming the random distribution of sulphide mineral grains and rock breakage, a relatively small percentage will be exposed on surface. Early liberation needs to considered in terms mechanical properties such relative host matrix. Clustering grains, make early possible. Depending nature associations, crushing rocks result different outcomes. Where clustering is manly very soft copper minerals, with being moderately strong feldspars or quartzite’s, rich parts are likely fragment first, resulting size minerals. However, case chalcopyrite, difference elastic between chalcopyrite feldspar quartz, not significant enough cause propensity for liberation. minerals occurs pyrite (or magnetite), stronger part one valuable During rock, sulphides zones way than gangue. Stress concentration within magnetite) failure surrounding matrix, thus promoting chalcocite grains. Therefore, textural information about associations (copper vs. pyrite/magnetite/garnet) critical significance evaluation coarse An absence close spatial significantly reduce possibility sulphides. blasting ore sufficiently intense, high-strain rate loading able induce micro-fracturing originating from individual as well their clusters. Due high loading, substantial amount energy can dissipated embryonic fragment, before macro-failure which relieve blast induced stress. Created micro-cracks play role subsequent comminution, where fragments enhanced density crushed more easily. Extensive micro-cracking also during heap dump leaching, stimulating infiltration/diffusion leaching fluids into interiors fragments.