METHOD FOR PRODUCTION OF CHARGE FOR EXPLOSIVE CRUSHING OF ROCKS Russian patent published in 2006 - IPC F42D3/04 

FIELD: mining industry, applicable, for example, at opencast mining of iron quartz rocks.

SUBSTANCE: the method consists in drilling of a borehole on a bench, formation of two kettle-shaped cavities in it in height and charging of them with explosive, the kettle-shaped cavities are formed asymmetrically relative to the borehole axis with a shift of the center of gravity of the lower cavity towards the bench by a value equal to ₁=(0,5-2)R, and a shift of the upper cavity to the opposite direction by a value equal to ₂=(0,2-2,5)R, where R- the borehole radius, m. The distance from the upper cavity is preset to be equal to ₃=(0,4-0,5)H, and that to the center of the lower cavity - ₄=(0,7-0,95)H, where H - the bench height.

EFFECT: enhanced degree of rock crushing by 7 to 10%, improved processing of the bench, and reduced consumption of explosive.

1 dwg, 1 ex