The material and the grinding medium are mixed together, collide with each other and squeeze. If it is dry grinding, because there is no material blocking in the cracks, it is very likely that the cracks will be squeezed smaller and smaller during the extrusion process, which will cause grinding. The mine efficiency is low and the material separation speed is slow; and if it is wet grinding, when small cracks appear in large minerals, the fluidity of the water will force the water flow into the cracks, which will block it, and then pass the impact of the grinding medium. And squeezing, it will gradually increase the cracks, and eventually the large pieces of material will be crushed, so the efficiency of wet grinding is high.

In addition to high grinding efficiency, wet grinding has the characteristics of low noise, fine and uniform grinding particle size, and less pollution to the working environment. The advantage of the dry grinding of the ball mill lies in the use of grate plate type mill tail discharge, the discharge speed is fast and smooth, there will be no belly up phenomenon, the cylinder does not need to be cooled, and the service life is long.

The disadvantage of dry grinding is that there may be dead corners in the mill. Once the material enters the dead corner, it will not be able to come out without water. The disadvantage of wet grinding is that the process of dehydration and drying is required after grinding, which increases the cost. 

1、Working principles are different

The main equipment for dry grinding of a ball mill is a dry ball mill. The structure of a dry ball mill is much more complicated than that of a wet ball mill. It must be equipped with a draft device, a dust exhaust pipe and a dust collector, which is determined by its working principle. Dry grinding of the ball mill requires that the material in the mill is dry, and no water or other liquids can be added. The material is ground by the medium of the ball mill in the mill, and the products that meet the requirements are carried out by the wind or airflow.

The main equipment of the wet grinding of the ball mill is the wet ball mill. The structure of the wet ball mill is simple. There is no need to add too many auxiliary accessories. Water or absolute ethanol needs to be added during the grinding process. During the grinding operation, the large materials will be affected by the impact of the ball mill Cracks are generated under the action of grinding, and the cracks gradually increase and deepen, and finally the materials are separated from the cracks, so as to achieve the effect of grinding the bulk materials into smaller ones.

2、Different scope of application

Dry grinding

Suitable for water reaction materials, such as cement, lime, marble and other building stones, water may produce other substances, it is not suitable for wet grinding, some products require storage and sales in the form of powder, also suitable for dry grinding; In addition, in order to save water, dry grinding can also be used in some arid areas due to the lack of water resources.

Wet grinding

Wet grinding is suitable for most materials, all kinds of metal ore, non-metal ore, as long as the water will not react, thus affecting the quality of finished products, can be wet grinding, common including copper, iron ore, molybdenum ore, phosphate ore, feldspar, fluorite and so on. The proportion of steel ball, material and water in wet grinding is 4:2:1. The specific proportion needs to be determined by grinding test.