METHOD FOR ROCK LOOSENING BY BLASTING Russian patent published in 1995 - IPC

FIELD: operations; applicable in mining industry and in construction of large pits. SUBSTANCE: made in rock is charged opening 1, and ammonium nitrate is laid in opening, e.g. by pile 2. Intermediate primer 3 is installed on the contact with pile 2 of ammonium nitrate. Diesel fuel is introduced into internal hollows 5 of pile 2 of ammonium nitrate contained in damp-proof shells and distributed uniformly by portions on pile 2. After stemming the opening 1, the charge is blasted. When charged opening elevation is less than 100 m from the surface, and actual hollowness of pile 2 of ammonium nitrate exceeding minimum needle value, excessive hollows of pile 2 during its placing are filled with fill neutral to ammonium nitrate, e.g. with sand. EFFECT: higher energy parameters of blast due to full explosion decomposition of ammonium nitrate and diesel fuel. 4 cl, 4 dwg