Ball Mills: These are cylindrical devices filled with grinding media (usually steel or ceramic balls) and the material to be ground. The rotation of the cylinder causes the balls to fall and crush the material.
Rod Mills: Similar to ball mills but use long rods as grinding media. They are used for coarser grinding than ball mills.
Hammer Mills: These use high-speed rotating hammers to crush and grind materials. They are useful for materials that are brittle or less dense.
Vertical Roller Mills (VRM): These mills use a combination of compressive and shear forces to grind materials between a rotating table and stationary rollers. They are efficient for grinding very fine materials and have a smaller footprint compared to ball mills.
Impact Mills: These include pulverizers that use high-speed impact to break down materials. Examples include jet mills and impact crushers.
Attrition Mills: These mills use friction to grind materials. They are often used for very fine grinding and can be used with dry or wet materials.
Bead Mills: These use grinding beads suspended in a liquid to grind materials. They are commonly used for very fine and ultra-fine grinding.