What Is The Difference Between Dry Grinding And Wet Grinding In A Ball Mill?

Divided into dry and wet grinding, a ball mill is a rotating cylindrical drum, usually with steel balls, ceramic or rubber filling the interior. As the drum rotates, the balls fall and crush the material, creating a fine powder.

Wet ball mill is a kind of grinding equipment widely used in mineral processing, building materials, chemical industry, etc. Its working principle is based on the combined effect of impact, grinding and shear force, and crushing is realized through the wet collision between steel balls and materials.

Dry ball mill does not use liquid at all, only rely on the impact of steel balls and friction for grinding. However, the disadvantage is that the material is easy to stick to the wall due to electrostatic effect or grinding dead space, which affects the uniformity of grinding.
Dry ball mill is more suitable for materials that will be deteriorated by water (such as cement, marble) or projects that need to obtain powder directly.

Advantages and Disadvantages of Wet Grinding VS Dry Grinding

1. Advantages of wet ball mill

Wet ball mill uses liquid grinding aid, which can effectively disperse the material, make the material evenly mixed, and improve the fineness of grinding. Because it is wet grinding, so there is no dust pollution, suitable for scenes that require high cleanliness, such as laboratory research or food processing. Of course, it is only suitable for those materials that will not react when encountering water, especially suitable for the grinding of complex mixtures. However, it is worth noting that wet grinding requires precise control of the proportion of liquid, otherwise it will lead to sedimentation or equipment clogging, and need to add additional drying equipment.

2. Advantages of dry ball mill

Dry ball mill does not require liquid handling equipment, the process is shorter, suitable for rapid experiments or small-scale production. It is especially suitable for cement powder or those materials that will react with water. Dry milling does not require additional drying process and produces powder directly. It is worth noting that dry milling is prone to uneven grinding due to static electricity or dead space, and requires additional equipment to deal with dust contamination.

How to choose between dry grinding and wet grinding?

1. If the material is easy to oxidize, easy to bond or need to mix a variety of ingredients, preferred wet grinding. If the material will be deteriorated by water or need to be stored in powder form, choose dry grinding.
2. If pursuing high fineness and uniformity of grinding, choose wet grinding; if only simple mixing or cost reduction, dry grinding is more suitable.
3. Wet milling has high efficiency, but there is drying cost; dry milling has low cost but limited efficiency and need to consider dust pollution. For example, an enterprise saves 30% of energy consumption by replacing wet milling with dry milling.

Wet grinding and dry grinding have their own merits, wet ball mill compared to dry can reduce dust, reduce over-crushing, suitable for subsequent flotation or wet process, but higher energy consumption and need to deal with wastewater. Dry mill is more suitable for small-scale rapid production projects, if you are not sure how to choose, you can contact us to get a free production program.