Abstract

Rock dust is applied to a mine wall for mine fire suppression in combination with a chemical foam, by generating the foam from air and a foamable liquid in a mixing chamber, and delivering the foam through one flexible conduit and a suspension of rock dust in water through another flexible conduit to a combiner, and causing the combined foam, rock dust and water to pass through a flexible hose to a delivery nozzle from which it is applied to a mine wall.

IPC Classes  ?

• E21F 5/08 - Rock dustingDepositing other protective substances
• E21F 5/10 - Devices for rock dusting
• E21F 5/12 - Composition of rock dust
• E21F 5/14 - Fluid barriers or rock dusters made to work by, or at the same time as, shots or explosions
• E21F 5/16 - Layers of hygroscopic or other salts deposited on floors, walls, or the like, for binding dustDeposition of such layers
• E21F 5/18 - Impregnating walls, or the like, with liquids for binding dust
• E21F 5/20 - Drawing-off or depositing dust

Abstract

Rock dust is applied to a mine wall for mine fire suppression in combination with a chemical foam, by generating the foam from air and a foamable liquid in a mixing chamber, and delivering the foam through one flexible conduit and air-entrained rock dust through another flexible conduit to a portable assembly composed of a Y-joint and a delivery nozzle for combining the foam and rock dust and applying the combination directly to a mine wall.

IPC Classes  ?

• A62C 3/02 - Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires
• A62C 5/02 - Making of fire-extinguishing materials immediately before use of foam
• E21F 5/10 - Devices for rock dusting