Abstract: Combined with the application of BCR（D）H-15 and BCRH-15E field mixed loading ve⁃ hicles in open-pit iron mines, the utilization of mixed loading emulsion explosive's explosive efficiency is improved essentially by optimizing blasting parameters, improving charging structure and adjusting explosive ratio. The application results in Gaocun Iron Mine show that, according to the usage of 1 000 t/a mixed emulsion explosive, the drilling volume can be reduced by 10%~12% after the hole network parameters are expanded, which saves 260 000 yuan/a of drilling cost and 890 000 yuan/a of blasting explosive cost. The average lump rate is reduced by about 2.0%, and the cost of lump crushing is reduced by about 880 000 yuan/a. The unit consumption of mixed emulsion explosive is reduced to 0.50 ~ 0.55 kg/m³, the linear meter blasting volume is increased by 10% ~ 15%, and the explosive is saved by 810 000 yuan/a. After adjusting the proportion of explosives, the blasting speed and work capacity of explosives are increased, the blasting effect is significantly improved, and the blasting cost is effectively reduced.

Key words: emulsion explosive mixing truck, mesh parameters, charge structure, explosive unit con? sumption, blasting effect