摘要
Abstract
The Zijinshan open-pit mine requires that the particle size after blasting be less than 0.6m during mining.Under the current blasting conditions,when there is pressure slag left at the foot of the step slope,a step slope angle of about 45° will be formed,resulting in a large resistance line of the chassis.When blasting in front of the step,large blocks are easily generated,and the blasting quality is difficult to meet the requirements.In order to improve mining efficiency and reduce mining costs,the Zijinshan open-pit mine optimized and adjusted the perforation inclination angle of the production steps,and conducted application research on perforation inclination angle optimization with perforation inclination angles of 70° and 60°,respectively.When the perforation angle is 70°,the average block rate after blasting is 20.59%;When the perforation angle is 60°,the average block rate after blasting is 7.99%,a decrease of 12.6%compared to before the experiment.Although the explosive consumption per unit has increased from 0.382(kg/m3)before the experiment to 0.417(kg/m3),the cost of secondary disassembly has decreased and the efficiency of shoveling has been improved;This experimental study shows that optimizing the perforation angle can significantly improve the blasting effect,reduce mining costs,and improve mining production efficiency.关键词
露天矿山/采矿/炮孔倾角/爆破优化Key words
open-pit mines/Mining/Borehole inclination angle/Blasting optimization分类
矿业与冶金
