Dedusting is an industrial cleaning procedure in which fine contaminants are removed using a pressurized stream of compressed air. The air is discharged into an open area and is then pumped back into the worksite or into an adjacent area to be disposed of. The purpose of deeding is to create a surface that is free of dust, grit and lint so that work can continue. When the area is cleaned, it is raked and new particles are pushed into the work area. A protective film is then applied to prevent any contamination from entering the paintwork.
During the process of dedusting, fine impurities are removed from bulk solids, including dust and other contaminants, using a pneumatic (high pressure) air jetting system. Deeds, bricks, asphalt blocks, and railway tracks are just some of the typical materials used for the treatment. The air jetting system leaves the bulk solids and dust in an open area where it can be further evaluated for removal by any subsequent industrial cleaning procedures. Deeds, bricks, asphalt blocks, and railway tracks are just some of the typical materials used for the treatment.
There are two types of dedusting techniques available.
These include mechanical deduction and pneumatic conveying systems.
- Mechanical deducing uses pumps and machinery to mechanically remove the bulk solids, and the pneumatic conveying systems use an internal fan to circulate the air and remove the dust and dirt particles.
- Both methods provide excellent results, however, mechanical deducing is often considered the more efficient operation method due to the fact that it does not require any energy source such as electricity or gas.
- However, the downside to mechanical deducing is that it does require skilled labour to perform.
Pneumatic conveying systems do not require energy sources for operation. However, manual labor is required for the collection and de-mineralization of granules and fine particles from the air. An example of this process is when large drums containing fine particles such as gravel or sand are being processed.
Fine particles such as these are commonly found in soil and so require specialised equipment to be collected and transported to a processing plant. These drum samplers are powered by an internal fan that circulates the air and also forces in air through a charged bed to break up and remove fine particles. Once the fine particles are collected, they are then transferred to a pre-mineralized sludge pit.
Plastic pellets are the material used in most deirding operations. Deodorizing and cleaning processes done with this type of medium often require the use of powerful vacuum systems that break up the solid particles in the plastic pellets into manageable sizes. These particles are then re-cycled and reused throughout the processing line.