论文部分内容阅读
在采矿爆破中,如大块数量多,则二次爆破量大,因而炸药、雷管等爆破材料的消耗就会增大。这样就会增加采矿成本。减少爆破中大块矿石数量的方法,主要有以下几个方面。1.加大炮孔网密度:加大炮孔网密度方法有二:一为沿用钢绳冲击式钻机穿凿孔径为200毫米以上的密集炮孔,使炸药分布均匀,以降低大块数量。如华新水泥厂采石车间将原来行距4.5～5.5米的双排爆破,改为行距为3～3.5米的三排爆破(孔距为4～7米,底盘抵抗线7～9米),因而减少了大块数量。这种方法
In mining blasting, if there are a large number of large pieces, the amount of secondary blasting is large, and the consumption of explosive materials such as explosives and detonators will increase. This will increase the cost of mining. The methods for reducing the number of large ore in blasting mainly include the following aspects. 1. Increase the density of blasthole network: There are two methods to increase the density of holes in the blasthole: one is to drill a dense blasthole with a hole diameter of 200mm or more for the continuous steel rope impact rig to distribute the explosive uniformly to reduce the number of large blocks. For example, the Huaxin Cement Plant quarrying workshop replaced the original double row blasting with a row distance of 4.5-5.5 meters into a three-row blasting with a row spacing of 3 to 3.5 meters (4 to 7 meters for the hole and 7 to 9 meters for the chassis resistance). Reduced the number of large blocks. This method