地下矿山中深孔落矿爆破块度控制技术研究

扇形中深孔爆破的落矿方式在大红山铜矿中的应用占总采矿量的61%以上,但大块产出率较高严重制约着矿山供矿强度,平均大块率高达22.7%。为了降低大块率,实现矿山生产的高效发展,提出采用环形中深孔爆破落矿工艺并进行了现场试验,试验结果表明环形中深孔爆破落矿可使平均大块率降低至10.3%,与传统扇形中深孔落矿相比较,平均大块率降低了12.4%,使盘区当班日供矿量增加152.29 t,增长率为51.1%;减少了处理大块所耽误的时间和二次破碎的炸药与雷管的消耗,在提高出矿效率的同时,降低了落矿成本,取得了良好的爆破效果。

THE MODERATE LONGHOLE BLASTING FRAGMENTATION CONTROL TECHNOLOGY RESEARCH IN UNDERGROUND MINE

The scallop moderate longhole blasting mining method in Da Hong-shan copper mine applications accounted for more than 61% of the total amount of mining, but the large output rate restricts the mines for ore strength, The average lump ore as high as 22.7%. In order to realize the mine production efficient development, the circular moderate longhole blasting technology and field test. The test results show that circular hole blasting can reduce the block rate is reduced to 10.3%, and the traditional scallop moderate longhole blasting mining compared with the average lump ore decreased by 12.4 percentage points. The panel on duty for the day ore quantity increase 152.31t, increase rate is 51.1%. Reduces the handling of large time delay and secondary crushing of explosives and the consumption of detonators, the efficiency of drawing and at the same time, reduce the mining cost ,achieved good blasting effect.