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南芬露天铁矿由于进入凹陷开采,三个放矿溜井相继报废。为了保证矿山的生产能力,在北山脚下建立了矿石倒装站和矿石破碎车间;岩石的运输由于采场的下降,汽车直排到土场,运距增加,不利于成本的控制,于是在三道渠建立皮带运输的岩石站。三站的相继投产使用,对爆破后矿岩的块度有了更严格的要求。爆堆密实,大块多,不仅降低电铲的工作效率,同时直接影响到三站的生产,降低了露天开采的综合经济效益。为此,南芬矿对于大块进行有效的控制,采用增加单位钻孔消耗量,缩减孔网参数;增加炸药单位消耗;采用微差爆破,合理微差时间等一系列的办法,大块明显减少,爆破质量得到了提高。
Nanfen open-pit iron ore into the depression as the mining, the three ore-discharging chute have been scrapped. In order to ensure the production capacity of mines, the ore flip-up station and the ore crushing plant were established at the foot of the Beishan Mountain. Due to the drop of the stope, the rockets were directly discharged to the soil field and the transportation distance was increased, which was unfavorable to the cost control. Drainage channel to establish the belt transport rock station. Three stations have been put into operation, after the demolition of ore rock block has a more stringent requirements. Blast dense, large blocks, not only to reduce the efficiency of electric shovel, while a direct impact on the three stations of production, reducing the comprehensive economic benefits of open pit mining. To this end, Nanfen mine for the effective control of large blocks, the use of drilling units to increase consumption and reduce the pore network parameters; increase the unit consumption of explosives; using differential blasting, a reasonable time difference and a series of methods, large clear Reduce the quality of blasting has been improved.