Dust Extinction Moisture (DEM) is the moisture level at which a material stops generating significant dust during handling, transfer, or storage. Reaching the proper DEM is an important factor in controlling dust emissions in mining, mineral processing, coal handling, and bulk material handling applications.
The Raring Corporation uses Mist Systems to apply plain water at truck dump hoppers and dump pockets. These systems increase the surface moisture of the material and help reduce dust generation downstream.
Mist Systems are often the first stage where water can be applied to the material stream. They are designed to work together with Conditioning Systems to uniformly increase ore moisture and help bring the material closer to its Dust Extinction Moisture level.
In some applications, especially coarse ore stockpiles, a chemical additive may be used to reduce water surface tension and improve moisture distribution. This can help improve dust control performance when plain water alone is not sufficient.
Mist Systems are commonly installed at truck dump pockets and can be used in combination with ADS™ Dry Fog dust suppression systems. While ADS™ Dry Fog controls airborne dust at the source, Mist Systems help condition the material to reduce future dust generation as it moves through conveyors, transfer points, crushers, screens, stockpiles, and other downstream material handling areas.
