Abstract: In order to investigate the influences of high voltage pulse breakage （HVPB） and mechanical breakage on particles properties and column leaching efficiency of Zijinshan copper ore， mechanical breakage and high voltage pulse breakage with charging voltages of 110 kV and 135 kV， respectively， were used to crush the copper ores with the fraction from 6.7 to 9.5 mm. The properties of progeny particles were measured， including exposure degree of metallic mineral on surface， existence of cracks， aspect ratio， circulartiy and saturated water content of ore heap and the clumn leaching were carried out using the copper ores from different breakage ways. The results indicated that only 1.6% of the particles had metallic minerals exposed on particle surface， and 2.5% of the particles had cracks existed on particle surface for mechanical breakage product. While these two proportions had increased to 3.4%~3.7% and 7.3%~17.2% respectively for HVPB products， which made the leaching solution easier to contact the metallic minerals inside the ore particles. The averaged aspect ratio of HVPB product was 1.42， lower than that of mechanical breakage product of 1.51. As a result， the permeation capacity of leaching solution along the major axis of the progeny particles of HVPB was higher than that of mechanical breakage product for 3.3%~3.5%. In comparison with the mechanical breakage product， the product of HVPB had slightly higher circulartiy and ore heap saturated water content， which could slightly improve the fluidity of the leaching solution on the particle surface and inside the ore heap. Column leaching tests were conducted for the product of different breakage methods and different size fractions. After 21 days for leaching， the copper leaching rate of HVPB product was found to be higher than that of mechanical breakage product by 6.6~11.1 percent， indicating that HVPB can effectively improve the leaching properties for Zijinshan copper ore.

Key words: high voltage pulse breakage, mechanical breakage, acid-leaching of the copper ore, aspect ratio, circulartiy, saturated water contents