What are the Differences Between Dry and Wet Type Ball Mill?

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Posted in: , on 27. Aug. 2021 - 11:14

First, we need to figure out what is ball mill?

The name of ball mill comes from its internal grinding medium - balls. Although the grinding medium is the same, the grinding method is slightly different. I''m going to discuss it with a focus on working principles.

The difference in working principle

The working principle of ball mill

1. Dry grinding

Dry grinding means that when the ore is ground into the size we need, the powder will be brought out from the ball mill by the airflow.

The material from the feeding device is uniformly fed into the first bin of the mill by the hollow shaft spiral. This bin has stepped lining or corrugated lining, which is filled with steel balls of different specifications.

The rotation of the cylinder generates centrifugal force to bring the steel ball to a certain height, and then fall, which will hit and grind the material. After the material is coarse grinding in the first bin, it will enter the second bin through the single-layer partition plate.

This bin is embedded with a flat liner, and the steel balls inside will further grind the material, then the powder is discharged through the discharge grate to complete the grinding. We can't add water or other liquids during the grinding process.

It is required that the materials must be dry, so it is called dry grinding. The dry grinding plays an important role in the grinding of various minerals.

2. Wet grinding

Wet grinding means that after the ore entering the mill, it will complete the grinding under the interaction of the grinding medium and the ore, and meet the needs of users.

The material needs to be added water or anhydrous ethanol during the grinding process. We must control the grinding concentration, otherwise, it will affect the grinding efficiency. The amount of water depends on the use of the mud, the amount of clay in the formula, and the water absorption of the clay.

It will be gradually pulverized under the action of impact and grinding. The movement of the ore needs to be driven by the water. The bulk material will be cracked under the impact and grinding of the grinding medium, with the crack gradually increasing and deepening, the final material will be separated from the crack to achieve the effect of bulk material being ground.

The grinding ore will be discharge through the discharge port, and then the discharged mineral will be classified into the qualified product in a spiral classifier, with the coarse sand being returned to the ball mill through the combined feeder to continue grinding.

The feeder feeds material continuously and evenly, the ground material will be continuously discharged from the ball mill. The wet ball mill can be divided into three types according to the motion characteristics: a simple swing type wet ball mill, a complex swing type wet ball mill, and a hybrid swing type wet ball mill.

If you want to learn more, This blog What are the Differences Between Dry and Wet Type Ball Mill? posted on FTMMachinery may help you.

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