GB372281A - Improved method of treating chlorates for blasting purposes - Google Patents

Abstract

372,281. Explosives. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Finska. Elektrokemiska Aktiebolaget ; 3, Glogatan, Helsingfors.) Nov. 3, 1930, No. 33028. [Class 9 (ii).] A chlorate briquette for the absorption of a comburent to make an explosive blasting cartridge is made by mixing finely divided chlorate with water, say 15 per cent, pressing the moist chlorate into blocks, say at 14À3 atmospheres, then drying under heat, say at 40‹ C. for 42 hours, the fineness of the chlorate, the amount of water, and the pressure being so chosen that the porosity is at least 10 per cent. The blocks may be surrounded with a paper envelope, and are preferably made hollow. For use, they are impregnated with a liquid such as benzol, kerosene, nitrobenzol, creosote oil, syrup, and a solution of resin in alcohol, or with melted solid or semisolid such as paraffin. The detonation speed may be increased by the addition of catalytic agents or the like, for example, carbides, metallic aluminium, magnesium, silicon, or silicon metals. Internal friction may be reduced by the addition of aqueous extract of peat, oils, gelatinous precipitates, tannin, graphite, or kieselguhr. The porosity may be further controlled by the addition of substances which shrink by loss of water or gasification, for example ammonium carbonate. The chlorate may be potassium chlorate or sodium chlorate or any other chlorate used for such purposes.