METHOD AND DEVICE FOR BLASTING OF HARD ROCKS Russian patent published in 1999 - IPC

FIELD: mining industry, in particular, method and device for blasting of rocks with employment of high-degree insensitive energy-producing material ignited with the aid of an electric charge with a moderately high energy, which results in rock cracking and destruction. SUBSTANCE: the blasting device has a repeatedly used blasting probe incorporating a high-voltage electrode and a grounding electrode separated by an insulating tube. The two electrodes of the blasting probe are in an electrical contact with a continuous bulk of high-degree insensitive, but combustible material, for example, powdered metal and oxidizer. Metal particles inside the mix of powdered metal and oxidizer produce a great number of meltable metal paths between the high-voltage electrode and grounded electrode under the effect of electric current supplied by a large capacitor storage battery via the high-voltage electrode. The great number of metal paths act similarly to an igniter element producing a sufficiently high resistance and feeding the electric power from the capacitor storage battery to the hot mix of powdered metal and oxidizer causing an intensive liberation of heat, which initiates exothermic reaction of powdered metal and oxidizer generating high-pressure gases resulting in cracking of rock. EFFECT: enhanced efficiency and safety of blasting operations. 16 cl, 8 dwg