Ball mills are mostly used grinding equipment that can grind materials either wet or dry with high efficiency. They are composed of a hollow cylindrical shell that rotates about its axis and is partially filled with balls made of steel, stainless steel, or rubber materials. The grinding is carried out through impact and attrition of the balls as the cylinder rotates, and the material is fed through the hollow shaft. Ball mills have advantages such as low installation cost, low production cost, and suitability for both batch and continuous operations. However, they also have disadvantages like high noise levels, relatively long milling times, and difficulty in cleaning. Ball mills find applications in grinding materials for industries like coal, pigments, and ceramics.

1. Ball Mills
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Group NO 02

2. Contents
• Introduction
• Structure
• Principle
• Advantages
• Disadvantages
• Applications
• Manufacturers
• Questions
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3. Introduction
• Mostly used grinding equipment with high efficiency
• Grinding can be carried out either wet or dry
• hollow cylindrical shell rotating about its axis and Length of the mill is
approximately equal to its diameter
• partially filled with balls made up of Steel, Stainless steel or rubber
• resistant materials such as Manganese, Steel or rubber
• Balls occupy about 30-50% of the volume and dia of the ball 12 mm-
125 mm
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4. Structure
• Ball mill is mainly composed of
• feed port
• discharge port
• grinding media
• grinding cylinder
• transmission department
• liner
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5. How does a Ball Mill Work?
• The material uniformly enters the first chamber of the ball mill by the
feeding device through the hollow shaft.
• The chamber has stepped lining or corrugated lining, which is filled with
steel balls of different specifications.
• Then the rotation of the grinding cylinder generates centrifugal force to
bring the grinding media to a certain height.
• After falling, they hit and grind the material.
• When the material is coarsely ground in the first warehouse, it enters the
second warehouse through a single-layer compartment board.
• The powder is discharged through the discharge raft to complete the
grinding operation
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7. Advantages
• The cost of installation is low
• The cost of Production is low
• It is suitable for materials of all degree of hardness
• The grinding Meduim is cheap
• Used for the grinding of explosive materials
• Suitable for both batch &continuous operations
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8. Disadvantages
• High machine noise level especially if the hollow cylinder is made of
metal, but much less if rubber is used.
• Relatively long milling time.
• It is difficult to clean the machine after use.
• Contamination of product may occur as a result of wear and tear
which occurs principally from the balls and partially from the casing
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9. Application
• The ball mill is used for grinding materials such
as coal,pigments,and fedspar for pottery.
• Grinding can be carried out in either wet or
dry but the former is carried out at low
speeds.
• The advantages of wet grinding are less power
consumption,increased capacity,no dust
formation etc…
• Dis advantages are high wear on the grinding
medium and neccesity to dry the product
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10. Manufacturers
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Container Products Corporation
Maag Automatik Inc

11. Questions
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