The stirred milling technologies currently available can be divided into two sub-categories: gravity-induced and fluidized. 

Gravity-induced stirred mills initiate a ball charge motion via rotational movement of a screw to provide a size reduction mechanism. 

In contrast, fluidized stirred mills use a rotational movement to fluidize a media-slurry mixture, resulting in a size reduction mechanism. 

The type of mill and the circuit configuration are intrinsic to maximizing the grade and recovery profile of an ore. 

Metso has both stirred milling technologies in the Vertimill and the Stirred Media Detritor (SMD), allowing Metso to offer the optimum equipment solution for the circuit.