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Heading: Control within Screening Buildings
Using buildings to enclose dry screening processes look like a good idea on the outside, but on the inside, it seems like there is one big mess.

If you are in colder climates where temperatures are well below freezing, the challenge becomes even greater. Attempting to heat the building while a baghouse system is sucking dust and heated air from inside the building and exhausting the heated air outside the building seems insane.

Does anyone have any suggestions, as to how to control dust within dry screening structures?

Jay Lukkarila

Why does the baghouse vent to the outside, It should be containing all the dust and just expelling air?
Wilkerson Wilkerson

a baghouse system should not vent to the outside if it is working correctly it should recycle the air and keep the heat in not sure what you are screening but have you considered a wet dust suppression system on the screen decks or if this is not viable and you have to vent to the outside fit a heat exchamger system to the air stream and recover the heat that way

michael hopkins


I was involved with designing and installing a system in a plant that dried, crushed and screened crusher run material. The final product was a -40 mesh material.

As mentioned above and in other replies - engineering practices and internal exhausting can apply.

For internal exhaust -
a. Overdesign the volume of air to be handled.
b. have a damper that allows you to choose whether to vent in or out.
c. pay close attention to material handling equipment. Screens are easy to confine, but belt conveyors are not. As the belt ages, the larges source of dust will be that which gets in the rubber cracks then is shaken out on the underside of the belt. If the material is fine, can you screw convey or pan feed it and use bucket elevators? These are easier to enclose. These options are undesirable for coarse aggregates.

Remember if you exhaust internally, you may gain moisture in the baghouse from the material. This can add up over a shift operation and start plugging or blinding of bags, so some consideration for minimal makeup air would be good (unless the feed is dried).

For a good guide on practices, martin Engineering publishes a good guide for dust collection from stone processing. They used to give it away (hardback). It of course highlights thier products, but is a good starting point.

hope that helps.

Brian Glackin
Buzzi Unicem USA
Brian Glackin
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