The re-circulation attritors are supplied with large holding tanks. The Attritor is filled with media and the discharge grids restrain the media while the material is allowed to pass through.

The principle of this series is the high circulation pumping rate which forces the entire contents of the holding tank to pass through the attritor several times per hour.

This results in a faster grind and a narrower particle size distribution. In this circulation process, the material passes through the grinding chamber multiple times until the desired particle size is obtained.