Selection of Grinding Media and Considerations

The most commonly used grinding media are ball media and rod media, in some cases using irregular shapes such as round table, column ball, short round rod, this is called shaped media. The materials used to make grinding media are mostly cast iron or alloy with special processing, followed by ceramics, alumina, etc.; the grinding media gravel used for gravel grinding are near spherical, ellipsoidal, egg-shaped, etc., which are specially made from ore or rock.

White Aluminum Oxider

Selection of grinding beads

As the fineness of the material requirements are getting higher and higher, the use of sand mills is becoming more and more common, and there are more grinding media on the market, how to choose a more suitable for their own production process and conditions of the grinding media, is a more critical and laborious thing. The following is a brief analysis of the following aspects.  

Chemical composition

Grinding media can be divided into glass beads, ceramic beads, steel beads, etc. according to the different materials. Due to the difference of chemical composition and manufacturing process determines the crystal structure of the grinding beads, the dense crystal structure ensures the high strength of the beads, high wear resistance and low ink absorption, etc.

The difference of percentage content of various ingredients determines the specific gravity of the grinding beads, and the high specific gravity provides a guarantee for high efficiency of grinding; the chemical composition of the grinding beads will have some influence on the performance of the slurry during the natural wear and tear of the grinding process, so in addition to considering the low wear rate, the chemical elements of the scruples are also factors to be considered. For example, when grinding magnetic tape powder or other electronic components slurry, metal Fe, Cu and other elements should be avoided; therefore, the choice of zirconium beads is often a common choice in this industry. 

Physical properties

Usually, the larger the specific gravity of the grinding beads, the greater the impulse, the higher the grinding efficiency, and the relatively large wear on the contact parts of the sander, so the viscosity of the slurry and the flow rate of the match become critical. Low density grinding beads are suitable for low viscosity slurry, and high density grinding beads are suitable for high viscosity slurry. 

Mohs hardness is the common index, the higher the hardness of the grinding beads, the lower the wear rate of the beads in theory. Although the abrasiveness of the beads with high hardness to the contact parts is larger, the filling amount of the beads, the viscosity of the slurry, the flow rate and other parameters can be adjusted to reach the best optimization point.

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Caution

Choose zirconium beads or glass beads according to the viscosity of the material. 

Choose the right size of beads according to the size of the raw material particles and the fineness required by the product.  

Check whether the screen aperture of the grinding machine is set appropriately, the aperture gap should be one third of the minimum bead diameter.

Try to avoid turning on the grinding machine in dry condition, which will cause unnecessary loss of beads and accessories. 

Different brands of beads should not be mixed.  

Try to avoid the mixing of small and large beads.

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