A Ball Mill is used to grind the materials to get a course or fine Power. Ball mill is also known as the tumbling mill and pebble mill.
Ball mill principle work on Impact and Attrition. Both are responsible for size reduction, rapidly moving balls are used for reducing the size of brittle materials.

The ball mill consists following Parts:

Cylinder: cylinder is made of a hollow metal that moves about its horizontal axis. the cylinder can be made of porcelain, metal, and rubber. the length of the cylinder slightly higher than its diameter.
Ball: The ball lies in cylinders, which are made up of stainless steel, the size of the ball depends on the cylinder diameter. The ball covers 30 to 50% area in the cylinder.

Working Principles

>> Open the lid and feed the materials into the cylinder
>> Introduced the fixed numbers of balls and closed the lid
>> Run the machine and adjust the speed as per required
>> After achieving the desired particle size, stop the machine and remove the materials.

>> Low Speed : At low speed, the mass of balls will slide or roll up one over another and will not produce a significant amount of size reduction.
>> High Speed : At high-speed balls are thrown to the cylinder wall due to centrifugal force and no grinding will occur.
>> Normal Speed : At Normal speed balls are carried almost to the top of the mill and then fall into a cascade across the diameter of the mill, in this way maximum size reduction is obtained.

Features

• Minimum loss of materials
• suitable for the wet and dry grinding process
• Sterility can be maintained due to a close container system, hence useful in the manufacturing of parenteral and ophthalmic products
• Particles size is easy to reduce
• Less energy consumed
• Easy to clean
• Required less space to install
• Low maintenance cost

Let’s explore some of the types of Milling Machines available below:

1. Cone Mill
2. Multi Mill