Dust emissions can be treated using different techniques:
• Dust aspiration is very costly and not flexible when a building is modified or enlarged.
• Wet dust suppression techniques by pulverising a mixture of water and a chemical additive (a surface-active agent whose price per tonne must be calculated) leads to a high level of water consumption, a daily consumption of the additive plus a large amount of humidity in the materials which increases the risk of clogging in spouts, grinders and rocker shovels.
Cap Minerals uses the water spraying principle but with a very important difference: according to your needs and situations, we can provide you with several processes that only use water, or an ultra fin air / water mixture or high pressure solution.
With Cap Minerals, you have a turnkey installation with implementation and installation of complete dust suppression solutions.
The core activity of Cap Minerals is dust suppression in mining and quarry grinding and sifting equipment.
Our main procedure can be described as treating dust particles in decompression exhaust hoods designed according to the type of material, the granulometry, the type of grinding-crushing mill and the width of the conveyor belts.
These exhaust hoods allow limited dust zones, (for example when exiting a overhead eccentric jaw crusher, a gyratory crusher or an impact crusher) and by their design, slow down the dust flow caused by the grinding chambers, also known as the “chimney effect”.
We have atomisation systems integrated into the exhaust hoods.
This process consists of water micronisation which leads to fog sprayed over dust on the minerals.
Atomisation is obtained by a regulated water and compressed air mixture forced through ultrasonic nozzles that literally explode into a million of 15 micron- diameter micro-drops of water.
The advantage of atomisation is that it requires very little water (5 litres / hour maxi per nozzle) and thus avoids risks of sludge and other build-up that could be linked to too much humidity on the materials.
To sum this up, in a dust emission zone, whether it is produced by fragmentation or by transfer of materials, the dust flow must be controlled and suppressed by an ultra thin fog that is the closest possible to the diameter of the dust particles.
At the same time as atomisation we also employ a complementary technique of micro pulverisation on different strategic points in the installation.
Spraying is performed using hydraulic sprayers that work with water pressure and whose flow can be varied according to needs.
This technique prepares materials where permitted with a larger amount of water, such as on primary hoppers, grinding mill feeding and larger mats where minerals or materials will be stored on the ground.
Contrary to atomisation, micro spraying does not need to be hooded as, because of the very nature of it, it is less wind impacted.
We are able to perfectly adapt our installations to existing grinding and sifting installations in this process.
This process can run with two different modes:
Automatic mode in which our control enclosure is directly linked to the installation automate, and thus controlled by it;
Manual mode when there is not an automate on the installation; our treatment points are independently turned on and off by an operator.
Zac du Long Buisson
Rue Alberto Santos Dumont
Tel : + 33 (0)2 32 28 40 51
Fax : + 33 (0)2 32 26 47 57