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2022-02-25

A ball mill is a grinder that utilizes various sized balls to grind and blend bulk materials into QDs/Nano size. The working mechanism is simple: A ball drops from near the top of a rotating hollow cylindrical shell, causing impact and this continuous impact causes attrition size reduction. The number and size of balls, the material used for the balls, the material used for the cylinder's surface, the rotation speed, and the material to be milled can all be changed to alter the nanostructure size. Ball mills are mostly used to crush and grind materials into extremely fine powders.

A hollow cylindrical shell rotates around the axis of the ball mill. This cylindrical shell is filled with stainless steel or rubber balls that correspond to the material inside. Attritor, horizontal, planetary, high energy, and shaker balls are the different types of ball mills.

ball mill

How does a ball mill work?

Ball mills grind materials with the help of balls. The ball mill is fed with materials such as iron ore, copper, and ceramics. Next, the ball mill is turned on, and it starts rotating either on its vertical or horizontal axis. The balls bounce around as the ball bill rotates, striking the material fed into the ball mill. The amount of force exerted by these ball strikes helps to grind these materials into finer and less coarse substances.

The critical speed must be attained for a ball mill to function well. The speed at which the balls in the mill begin to rotate along the inner walls of the mill is referred to as critical speed. If the critical speed of a ball mill is not reached, the balls will remain stationary at the bottom, which results in little or no impact on the material.

Benefits of using a Ball Mill

1. It produces extremely fine particles (particle size less than or equal to 10 microns).

2. Because it can be used in a completely enclosed form, it is suitable for milling toxic materials.

3. Its range of applications is vast.

4. It can run indefinitely.

Disadvantages of using a Ball Mill

1. Product contamination can occur as a result of wear and tear, which is caused primarily by the balls and partially by the casing.

2. Excessive machine noise, particularly if the hollow cylinder is made of metal, but significantly reduced if the rubber is used.

3. Milling time is relatively long.

4. Cleaning the machine after use is difficult.

Types of ball mills in relation to the Drive Mode

1. Center drive ball mill: The driving power device is located in the center of the fuselage, and the motor drives the ball mill to run through the reducer. The hollow shaft in the center of the ball mill drives the grinding body to rotate under the power system's drive-in operation.

2. Edge Drive Ball Mill: The motor drives the cylinder movement by driving the gears at the cylinder's edge through the reducer.

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