METHOD FOR PREPARATION OF EXPLOSIVE COMPOUNDS AT CHARGING OF BLAST-HOLES AND WELLS (MODIFICATIONS) Russian patent published in 1999 - IPC

FIELD: mining art, in particular, methods for manufacture of explosives based granulated ammonium nitrate. SUBSTANCE: the method consists in mixing of dense granulated ammonium nitrate with liquid fuel and solid disperse additives, and changing of ammonium nitrate into a less dense porous state by heating it to a temperature above 32.3 deg C, featured by the fact that liquid fuel additive alone or with addition of surface-active substance is introduced in heated nitrate, and the ready-made mixture is cooled down at constant agitation to a temperature of 32.3 deg C, or to the ambient temperature, after that the mixture is fed to blast-hole of well. The second modification is featured by the fact that heating of dense granules of ammonium nitrate is performed in the process or after mixing with liquid fuel additives heated to a temperature below their flash point. EFFECT: production of stable, balanced in composition, granulated explosive compounds, which results in enhanced efficiency of blasting and reduced expenditured connected with manufacture of explosive compound. 5 cl