EXPLOSIVE CHARGE WITH BOTTOM-MOUTH STEMMING Russian patent published in 2000 - IPC

FIELD: mining industry, applicable in blasting of seams dangerous in gas, methane and hydrogen inclusive. SUBSTANCE: in the explosive charge with a bottom stemming the relation between the weights of the bottom stemming and explosive together with the live primer makes up 1:1, the weight of the mouth stemming is twice heavier than that of the bottom, and the size of carnallite particles in stemming does not exceed 3 mm. Carnallite is used as stemming material at the following relation of components: potassium chloride-15-17, magnesium chloride-20-25, sodium chloride-25-32, crystal water-24-25, impurities - up to 100. The charge is composed of explosives of various safety classes, and an explosive of a lower class with respect to the explosive of the main charge is used as a live primer. EFFECT: enhanced safety of blasting of any rock seams dangerous in gas, hydrogen inclusive. 4 cl, 1 dwg