One of the most common types of such mills is the ball mill, which consists of large rotating cylinders partially filled with spherical grinding media. Screens are used to separate out particles in a specific size range. They operate in a sloped position and are vibrated mechanically or electromechanically to improve material flow.
Wet output agglomerates, balls and granules are covered in a layer of adhesive and plastic fines that cushions and lowers the force exerted on the output. In addition, the product circulates poorly in the mill. For these reasons, a hot air scan is often performed which requires an efficient dust removal facility; –