yes..dust can explode u know..under certain conditions..this is what my lecturer separation process lecturer said in class yesterday..first2 ase mcm pelik je..so decide utk gugel..oh yeah..its true..so kawan2..beware of dust ye..kalo x nnt explode..
A dust explosion is the fast combustion of dust particles suspended in the air in an enclosed location. Coal dust explosions are a frequent hazard in underground coal mines, but dust explosions can occur where any powdered combustible material is present in an enclosed atmosphere.
Conditions for dust explosion
- A combustible dust
- The dust is suspended in the air at a high concentration
- There is an oxidant (typically atmospheric oxygen)
- There is an ignition source
Mechanism of dust explosions
Dusts have a very large surface area compared to their mass. Since burning can only occur at the surface of a solid or liquid, where it can react with oxygen, this causes dusts to be much more flammable than bulk materials. For example, a 1 kg sphere of a material with a density of 1g/cm3 would be about 27 cm across and have a surface area of 0.3 m2. However, if it was broken up into spherical dust particles 50µm in diameter (about the size of flour particles) it would have a surface area of 1600 m² This greatly increased surface area allows the material to burn much faster, and the extremely small mass of each particle allows it to catch on fire with much less energy than the bulk material, as there is no heat loss to conduction within the material. When this mixture of fuel and air is ignited, especially in a confined space such as a warehouse or silo, a significant increase in pressure is created, often more than sufficient to demolish the structure. Even materials that are traditionally thought of as nonflammable, such as aluminum, or slow burning, such as wood, can produce a powerful explosion when finely divided, and can be ignited by even a small spark.
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