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Analysis of factors affecting comminution

Analysis of factors affecting comminution

Add time: January 17, 2013 browse: second
Factors affecting comminution
(1) free crushing and buffering crushing. In the process of comminution, especially in the ultra-fine crushing area, there is a crushing limit. In a certain container, the crushed particle size reaches the required value. When the comminution is continued, the over comminuted material will play a buffer role, which is called buffering comminution. This phenomenon is undesirable. Therefore, it is called free crushing operation when the particle size is qualified.
(2) dry grinding and wet grinding. There is moisture in the material, and the powder agglomerates in the grinding process, which acts as a buffer and adheres to the device, thus reducing the grinding efficiency. In this case, high temperature steam or hot water is passed from the outer wall of the device to increase the temperature in the device, or hot air is sent into the crushing chamber to prevent blocking of the crushing device. This method is called dry operation. Compared with the wet grinding method, this method can improve the grinding effect. In addition, the fine grinding machine can prevent the product from overheating and pulverizing uniformly. In terms of power consumption, wet comminution is about 30% lower than that of dry grinding, but the abrasion of pulverizer is large.
(3) grinding additives. Especially in the process of micro comminution, adding some substance can improve the comminution speed and shorten the time needed to reach a certain particle size. Substances like this are called grinding aids. At present, the function and mechanism of grinding additives are not very clear, but to seek effective additives by experience. The existing additives are: isoamyl alcohol for iron vibration comminution, TDA for clinker grinding in cement industry and RDA for limestone crushing. In addition, there are tallow, aluminum stearate and so on.
(4) mechanical properties of materials. The stress produced by external force acting on the material during crushing process includes tensile stress and shear stress. The compressive strength of commonly used materials indicates the difficulty of crushing materials. There are mainly compression mills Broken jaw In addition to these, there are other stress functions. Therefore, when selecting the crusher, the tensile strength, bending strength and shear stress of materials should be considered.


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