Improving Quality of Granulometric Composition at Open-Pit Mines of Construction Materials to Reduce Well Diameter

[摘要] The paper suggests an approach to solving the issue of the quality of granulometric composition of rock mass after its loosening by explosion. Effects of the percentage ratio of the standard piece to the total mass of the rock are a relevant problem, which is solved by reducing the diameter of the blast hole. This approach is caused by the best distribution of the explosive on the unit being processed. The blasting unit has both natural and induced fracture systems that divide the solid into blocks, and reducing the well diameter leads to a thickening of the well grid, and thus increasing the probability of placing a charge in every rock block separated by a crack, being a density separation plane from the physical point of view. Constant specific consumption is a prerequisite of the quality of crushing.

[发布机构] St. Petersburg Mining University, 21st Line, 2, St-Petersburg; 199106, Russia^1

[效力级别] 电工学

[关键词] Blast holes;Density separation;Fracture systems;Granulometric compositions;Rock block;Rock mass;Total mass;Well diameter