Aem Lect7

This document discusses various types of ball milling equipment used for particle size reduction in materials processing. It describes critical mill speed, proper mill speed, and considerations for milling media selection such as density, cost, and wear resistance. Planetary ball mills are highlighted for their ability to reduce milling time through planet-like movement. Attrition mills use rotating shafts to agitate grinding media and particles but have short blade lifetimes. Jet mills can finely grind hard materials through particle impaction but have high costs.