Dedusting

In 35 years of contract processing powders and granules, Custom Powders Ltd has faced a huge range of exceptional requirements for finished product performance. Many of these have included requirements for low dust content whether required for aesthetic reasons, customer or user experience or critical to the end product performance.
Sieving has an important use here but is not always the answer. Air classifying has been extremely effective but depending on the raw material may be impractical.
As a result of this Custom Powders Ltd has developed a range of bespoke de-dusting systems and unique product tests, to ensure we have achieved consistent performance to the most demanding low dust products.
The most common application for de-dusting systems is within a value adding process eg agglomeration or compaction. Here the de-dusting not only has to achieve the end product requirement, it must be compatible with the speed of the process being operated.
De-dusters operate with both mechanical and air agitation to ‘knock’ fines off the product particle and then to remove the dust particle via air conveying. Whenever possible, dust extracted is recycled continuously to the process, for example in compaction or agglomeration.
A further option available to some products is by post treatment of a granule or powder with low levels of a suitable liquid, often oil. A suitable dosing and blending system is required often followed by a sieve system to remove or break down any agglomerates formed prior to packing.