VSI Crusher Dust Control

If dust is blowing out from the bottom of the VSI crusher, this indicates that the unit is being under-fed. If the feed rate cannot be increased, close off the feed opening by adjusting the feed control plate and control gate to minimise the rush of air.

While it is not generally necessary to suppress dust within the crusher (either by dry dust collection or mist spray suppression), the turbulent activity within the crushing chamber makes it an ideal environment for the addition of small quantities of water by means of mist sprays to effectively control dust in other parts of the process plant downstream of the crusher.

However, on start-up or shut-down with no material flowing into the crusher (completing start-up of the plant prior to crusher), there will be a discharge of dust caused by the crusher pumping large volumes of air.

We recommend the following:

• Minimising the time that the crusher is running without material being fed
• Fitting of mist sprays close to the discharge that is activated automatically from motor power on/off control so as to control the dust emission on start-up and shut-down.