Stirred media mill,Stirred media Grinding Mill for Sale

Stirred media mills can be applied to relatively coarse feeds and grinds, with feeds up to 6 mm and products as coarse as 300 Pm possible from some of the available mills. These do, however, represent extremes in the range, and, more typically, feed sizes will range from 300 Pm down to 50 Pm. Products typically range from 50 Pm down to 5 Pm. The definition for ultrafine products is not an industry standard, but for the purposes of this paper, it is defined as sub-15 Pm. Stirred media mills can be classified into a number of different subcategories predominantly defined by the speed, geometry, and orientation of the media agitator or stirrer.

Stirred media mills such as hammer mill or the Vertical mill, which use larger media, are more efficient with coarse, hard feeds. Fluidized media mills using low-density silica or ceramic media have the advantage for ultrafine milling with fine feeds.

One commonly quoted characteristic of stirred mills, the energy intensity, does not have a strong influence on the relative performance of the mills. Mills such as the Vertimill and Tower Mill with low energy intensities operate as efficiently as mills, such as the SMD and the Netzsch/IsaMill, which have very high energy intensities. The key is correct media selection. The various mills are described briefly in the following sections.

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. Formats has both stirred milling technologies in the Vertimill and the Stirred Media mills, allowing Formats to offer the optimum equipment solution for the circuit.