In most industries size reduction falls in two general categories: crushing and milling. Crushing typically means reducing large chanks to sizes about 0,5 to 0,75 or smaller. Milling usually means reducing mmaterial to sizes in the low-micron or even nano-size range. Milling may be done wet or dry. Attrition milling technologies relate to chemical processing applications. Media milling is one common way to achive desired results.
Attrition mills are more appropriate for mid-range size particles. Such millsutilize 3-10mm media to produce material ranging in size from approximately 1 to 10 microns.