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What Is The Difference Between Dry Ball Mill And Wet Ball Mill?

Date:2021-11-03 11:15:03    From:    Click:
Ball mill is a kind of grinding mill that uses steel balls or ceramic balls as grinding media to grind materials.

ball mills

Ball mill is widely used in the production of cement, silicate products, new building materials, refractory materials, fertilizers, black and non-ferrous metal beneficiation, and glass ceramics.
The ball mill is suitable for grinding various ores and other materials. It is widely used in mineral processing, building materials and chemical industries. It can be divided into dry grinding ball mill and wet grinding ball mill.

What is the difference between a dry ball mill and a wet ball mill?

The difference between wet ball mill and dry ball mill is mainly reflected in three aspects: First, the working principle is different; Second, the structure is different; Third, the scope of application is different.

1. Working principles

When the dry ball mill is running, the material is evenly spiraled into the first bin of the mill through the feeding hollow shaft from the feeding device. The bin is equipped with a step liner or a corrugated liner, and is equipped with steel balls of different specifications. The centrifugal force generated by the rotation of the barrel of the ball mill will bring the steel ball to a certain height and then fall, thereby crushing and grinding the material.

After the material is coarsely ground in the first warehouse, it enters the second warehouse through the single-layer partition board. The warehouse is equipped with flat liners and equipped with steel balls of different specifications to further grind the materials. Finally, the qualified materials are discharged through the unloading grate to complete the grinding operation.

ball mill working principle

The working principle of wet ball mill is roughly the same as that of dry ball mill, but there are some differences. The wet ball mill needs to add an appropriate amount of water or absolute ethanol during the grinding process, which means that there are certain requirements for the grinding concentration. The amount of water is determined by the nature of the material. Qualified materials are discharged out of the barrel through the discharge part, and unqualified materials are returned to the wet ball mill for regrind.

2. Ball mill structure

Both the dry ball mill and the wet ball mill include the main parts such as the feeding part, the discharging part, the rotating part, and the transmission part (reducer, small transmission gear, motor, electric control).

The difference is that the structure of the dry ball mill is more complicated than that of the wet ball mill. Its discharge port is straight cylindrical, and it is equipped with a draft device, a dust exhaust pipe and a dust collector. This is also determined by its working principle. The wet ball mill has a simple structure and does not need to add too many auxiliary accessories. The discharge port is trumpet-shaped and a screw device is built-in to facilitate discharge.

wet ball mill
Wet ball mill

3. Scope of application

Under normal circumstances, dry ball mills are suitable for various metal ores, non-metallic ores, etc., including materials that react with water, such as cement, marble and other building stones, or products that require storage and sales in powder form . In addition, if the processing plant is located in an arid area and water resources are scarce, dry ball mills can be used for water conservation considerations.

The wet ball mill has a wide range of applications and can process various metal ores and non-metal ores. Common ones include gold, silver, copper, iron, molybdenum, phosphate, feldspar, fluorite, and so on. As long as it is ensured that the quality of the final product will not be affected when the material meets with water, a wet ball mill can be used. The ores that need to be sorted are usually processed by a wet ball mill.

It should be noted that when using a wet ball mill, it is necessary to determine the ratio of steel balls, materials, and water through a beneficiation test to ensure the ideal grinding effect. As for the choice of grinding equipment, it still depends on the follow-up operation of the ball mill, the nature of the product, and the production cost.

dry ball mill
Dry ball mill

The dry ball mill adopts the grate plate type grinding tail discharge, the discharge is smooth, there is no phenomenon of rising and grinding, the cylinder does not need to be cooled, the service life is long, and the failure rate is low.

Wet ball mills have superior performance, higher grinding efficiency, and lower requirements for ore moisture content. In addition, it has fewer auxiliary equipment and simple material transport devices, so the investment is about 5%-10% lower than that of dry ball mills.

From the perspective of economic effects of grinding operations, most concentrators will use wet ball mills, because wet ball mills are highly adaptable to materials, can be produced continuously, and have a large crushing ratio. The wet ball mill has higher grinding fineness and better beneficiation effect.

ball grinding mill

The above are the three major differences between dry ball mills and wet ball mills, and how to choose between the two.

Only by finding the grinding method that the material is suitable for can the ball mill be able to ensure the quality and efficient operation of the ball mill. Both types of grinding equipment have their own advantages. We are still focusing on the nature and characteristics of the material, the requirements for the product, and the working environment. Make a rational choice after consideration.