초록 ▼

A pourable blasting agent of high water resistance, having controlled density and bulk blasting strength greater than that of conventional ammonium nitrate-fuel oil (ANFO) mixtures, comprises two main essential components, i.e. (1) 40 to 60% by weight of a dry or essentially dry, solid, particulate

A pourable blasting agent of high water resistance, having controlled density and bulk blasting strength greater than that of conventional ammonium nitrate-fuel oil (ANFO) mixtures, comprises two main essential components, i.e. (1) 40 to 60% by weight of a dry or essentially dry, solid, particulate oxidizer salt, with or without added fuel oil for oxygen balance and (2) 60 to 40% of a water-in-oil emulsion containing oxidizer salt dissolved in water and combined with an oily vehicle held in stable emulsion condition with a small quantity of water-in-oil emulsifier, the emulsion also containing a density controlled sensitizer such as hollow glass beads, polystyrene beads, microballoons or equivalent. The first component is preferably a fertilizer grade prilled ammonium nitrate, with or without added oil; the second is of heavy oil or grease consistency having high resistance to the extraction of salt therefrom in water and being of substantially higher bulk density than the particulate material. The components are thoroughly mixed together to substantially eliminate voids between the solid granules. The oily or greasy emulsion contains enough oil, with or without other fuels, to give substantial oxygen balance to the whole mixture. The required quantity of a highly effective emulsifier is minimized by high shear mixing to insure a stable emulsion of the second component.

대표청구항 ▼

A blasting composition consisting essentially of a combination of: (a) 40 to 60% by weight, based on the total composition, of a water-in-oil emulsion comprising powerful oxidizer salt in aqueous solution, said solution being dispersed in an outer continuous oil phase and including a gas-trapping de

A blasting composition consisting essentially of a combination of: (a) 40 to 60% by weight, based on the total composition, of a water-in-oil emulsion comprising powerful oxidizer salt in aqueous solution, said solution being dispersed in an outer continuous oil phase and including a gas-trapping density-reducing material to sensitize the composition and improve its detonability, (b) 60 to 40% by weight of a substantially solid particulate oxidizer consisting primarily of ammonium nitrate, and (c) the emulsion being blended through and into the solid particulate oxidizer so as to fill substantially completely the voids and interstices in and between the solid particles so as to substantially exclude water.