A Study of Millisecond Blasting on High Bench at Barun Iron Ore Operation

A Study of Millisecond Blasting on High Bench at Barun Iron Ore Operation

Blog Article

To improve the productivity and efficient of modern large-scale open-cut mines, a number of technologies are developed and trialed, including new blasting equipment, larger blasting holes, high benches, air spacing, and short-delay blasting within holes.However, the relative blasting parameters need field calibration and further investigation of theories on these techniques are required.This paper studied the open-cut bench blasting at Barun Eboxi Mine of Baotou Iron and Steel Group via theoretical analysis on shock wave, numerical simulation, and field test.According to the technical conditions of H-Brake Input Assembly the site, three sets of vertical boreholes at 310 mm diameter were drilled on 24 m high batter; and three sets of air-spaced charges were set up.The digital electronic detonator was used to initiate at millisecond intervals.

The study found that under the condition of 24 m high bench, the use of intermediate air interval is beneficial to the rock fragmentation.The delay time within the hole is 3-8 ms.The bottom of the lower explosives and the top of the upper explosives were devised for initiation to optimize the initiation location.The peak effective stress points are 63.6%, 52.

2%, and 8.9% higher, respectively.The field test SALON INTRO KIT of high-bench intrahole millisecond blasting in Barun Eboxi mine shows that the intrahole millisecond blasting parameters proposed in this study are feasible.