A tube mill is a type of grinder used to grind and blend bulk material into nano size using different sized balls. The working principle is simple; impact and attrition size reduction take place as the ball drops from near the top of a rotating hollow cylindrical shell. The nanostructure size can be varied by varying the number and size of balls, the material used for the balls, the material used for the surface of the cylinder, the rotation speed, and the choice of material to be milled. Tube mills are commonly used for crushing and grinding the materials into an extremely fine form. The tube mill contains a hollow cylindrical shell that rotates about its axis. This cylinder is filled with balls of very small size that are made of stainless steel or rubber to the material contained in it. Tube mills are classified as attritor, horizontal, planetary, high energy, or shaker.

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