Initial investigations of the Deswik vertical stirred mill . - FLThe Knelson-Deswik mill being developed by the FL group is a vertically stirred mill as illustrated in figure 1 [65, 66]. It is described as a filling the gap in stirred milling technologies used in the mineral processing industry. The impellor is a set of disks installed along the axis of the vertical shaft at specific intervals.vertical shaft stirred mill,Outotec HIGmill® high intensity grinding millThe HIGmill comprises a mill body, shaft with grinding discs, shell mounted counter rings, gearbox, and drive. The grinding chamber is filled up to 70% with grinding beads. Rotating discs stir the charge and grinding takes place between beads by attrition. The number of discs (grinding stages) depends on the application.