The difference between sand mill and ball mill

2021-12-31

The utility model belongs to a wet superfine grinding equipment, which is developed from a ball mill and is widely used to produce superfine powder (submicron powder). There are many classification methods for grinders: according to the structure and shape of the stirring shaft, it can be divided into disc type, rod-disc type, rod-disc type, etc. According to the layout of the mill barrel, it can be divided into vertical and horizontal. According to the size, it can be divided into laboratory, small, medium, large and super large.
No matter the grinding principle, grinding fineness and application range are different, they are not suitable for the mill. Moreover, the vertical agitating mill has an independent energy input after all, without the help of the earth's gravity, it can be regarded as a technological revolution of grinding equipment. Due to the low speed of the stirring mill, the large medium size, and the large change in the radial velocity gradient along the pin shaft, the grinding efficiency is low and the product particle size distribution is wide. Therefore, the stirring mill is gradually being squeezed out of the market by sand mills, and now it is only suitable for cemented carbide, ferrite or pre-grinding.
1. The development of grinding technology.
With the increase of abrasive particle size and the development of abrasive separation systems, the particle size used for abrasives is getting smaller and smaller. The separation of small-size Grinding Media is a difficult point in the development of sand mills. The slit ring (very small flow area) and static screen used in conventional sand mills are difficult to separate small-sized media. Therefore, dynamic centrifugal separation systems are being used more and more. The centrifugal force generated by the rotating medium of the split rotor makes the center of the rotor rotate around the rotor, and the center of the rotor is mainly slurry. The separation screen is arranged in the center of the rotor. Clogging and wear occurred. Therefore, it is a technological leap in the history of the development of sand mills to use the principle of dry air classification to sort the sanding media.
2. Horizontal centrifugal sanding equipment.
Recently, major domestic and foreign Sand Mill manufacturers have unilaterally believed that to improve product fineness (reduce particle size), the energy density of sand mills must be increased. In this case, there have been many pin sand mills with complex structures. After several years of artificially complex sand mill design, people finally began to simplify the complex. Since the real abrasive only appears in the abrasive area with a certain energy density, the low energy area only generates heat. There is only the outer ring area of the maximum line speed in the high energy density area. On this basis, a centrifugal sand mill was produced. The centrifugal sand mill can concentrate more materials to be ground in the high-energy area, greatly improving the grinding efficiency.

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