Principle of Ball Mill
• Ball Mill Operates on the principle of impact and attrition.
• Rotating balls in a cylindrical shell cause size reduction by repeated impacts as they tumble.
Construction
Cylindrical Shell: Rotating drum filled with grinding media (balls).
Grinding Media: Balls made of steel, ceramic, or other materials.
Feed Mechanism: Hopper for material input.
Discharge Mechanism: Outlet for processed material.
Drive Mechanism: Motor and gears to rotate the shell.
Working
Material is fed into the rotating shell filled with balls.
As the shell rotates, balls fall onto the material, causing impact and attrition.
The continuous rotation allows for thorough mixing and size reduction.
Processed material is discharged from the outlet.
Uses:
Fine grinding of materials in the mineral, ceramic, pharmaceutical, and chemical industries.
Merits:
Suitable for wet and dry grinding.
Uniform particle size distribution.
High efficiency for fine and ultra-fine grinding.
Demerits:
High energy consumption.
Long milling times.
Wear of grinding media and liners.