The difference between wet ball mill and dry ball mill
Date:2021-10-17 14:59:50
Author:admin
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234
The material and the grinding medium are mixed together, colliding and squeezing each other, if it is dry grinding, because there is no material blocking in the crack, it is very likely that the crack will be squeezed smaller and smaller during the extrusion process, which will result in low grinding efficiency and slow material separation; And if it is wet grinding, when large minerals appear small cracks, the fluidity of the water will force the water flow into the cracks and produce a barrier to it. After the impact and extrusion of the grinding medium, the cracks will gradually increase, eventually, large pieces of material are 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 the grate plate type of tail discharging, the discharging speed is fast and smooth, there will be no belly ups, 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. The working principle is 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 an induced draft device, a dust exhaust pipe and a dust collector, which is determined by its working principle. The dry grinding of the ball mill requires that the material in the mill is dry, no water or other liquids can be added, the material is ground by the ball mill medium 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 a wet ball mill. The structure of the wet ball mill is simple, and there is no need to add too many auxiliary accessories. Water or absolute ethanol needs to be added during the grinding process. In the grinding operation, the large pieces of material will crack under the impact and grinding action of the ball milling medium. The cracks gradually increase and deepen, and finally the material separates from the cracks, so as to achieve the effect of grinding the large pieces of material smaller.
2. The scope of application is different
Dry grinding: It is suitable for materials that react with water, such as cement, lime, marble and other building stones. It may produce other substances when exposed to water, so it is not suitable for wet grinding. Some products are required to be stored and sold in powder form, which are also suitable for dry grinding; in addition, due to the lack of water resources in some arid areas, dry grinding can also be used in order to save water;
Wet grinding: Wet grinding is suitable for most materials, all kinds of metal ores and non-metallic minerals. As long as they will not react with water and affect the quality of the finished product, wet grinding can be used. Common ones include copper ore, iron ore, molybdenum ore, phosphate ore, feldspar ore, fluorite ore and so on. The ratio of steel ball, material and water during wet grinding is 4:2:1, and the specific ratio needs to be determined by grinding test.
The above is the difference between dry ball mill and wet ball mill, 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. The two kinds of grinding equipment have their own advantages. We still make a rational choice after considering the nature and characteristics of the material, the requirements of the product, and the working environment.
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