Dust Control Handbook for Industrial Minerals Mining and Processing

Diffusion. The spread of dust particles from high concentration areas to lower concentrationareas. Many times this is achieved in ventilation systems by dust-laden air being mixed withclean, dust-free air.Drifter drill. A drill used in underground mining to drill horizontal holes.Drill deck (drill table). A deck or table on the drill located 2–3 ft above the ground surface andadjacent to the drill operator's cab. This deck is used by the operator to gain access to the drillrods when needed to add more rods or to change drill bits.Drill rods. Metal rods, also called "steels," used to connect the rotary head to the drill bit asdrilling proceeds through the ground.Dual-nozzle bagging system. A type of fill nozzle for filling 50- to 100-lb bags of product wherethe inner nozzle is used for filling and the outer nozzle is used to exhaust excess pressure fromthe bag.Dust. Small solid particles, often created by the breaking up of larger particles.Dust collector. An air cleaning device used to remove air-entrained particles.Dust collector airflow. The quantity of air that flows through a dust collector.Dust collector airflow to bailing airflow ratio. A ratio of dust collector airflow and bailingairflow, mathematically represented by the dust collector airflow divided by the bailing airflow.Dust suppressants. Chemicals or substances applied to a surface to prevent dust emissions fromadhering to that surface.Elastic limit. The maximum stress that can be applied to a material without causing permanentdeformation.Electrostatic charge. The physical electrical property of a dust particle that will cause it toexperience a force, either attracting or opposing, from an oppositely charged electricalcomponent or device.Electrostatic precipitator. A particulate control device that uses electrical forces to moveparticles from the gas stream to collection plates.Elutriation. The process of separating lighter from heavier particles by flow between horizontalplates.Enclosing hood. A hood that either partially or totally encloses an area to capture the dust sourceor dust-laden air and prevent it from flowing out into a mine or plant environment where it couldcontaminate workers.278 Glossary