Sand grinding and dispersing mixerAs a core equipment in industries such as coatings, inks, and new energy materials, its core function is to achieve ultrafine dispersion and uniform grinding of materials. The particle size distribution, stability, and production efficiency of the final product all rely on precise control of equipment parameters. The key parameters such as stirring speed, sand grinding medium specifications, grinding chamber volume, and dispersion disk structure together constitute the "parameter system" that affects the treatment effect. A deep understanding of the mechanisms and matching logic of each parameter is the key to achieving efficient production.

The stirring speed is the primary parameter that determines the energy transfer efficiency, directly affecting the dual effects of dispersion and grinding. When the speed is too low, the dispersing disk cannot generate sufficient shear force, and the material is prone to agglomerate into blocks, making it difficult to achieve uniform dispersion; If the speed is too high, it can cause a series of problems - not only can the "material ring" appear on the inner wall of the grinding chamber due to excessive centrifugal force, reducing the effective contact between the grinding medium and the material, but it may also cause a sudden rise in material temperature, which can damage the performance of thermosensitive materials. Different materials need to be matched with exclusive rotational speeds: for coating slurries with lower viscosity, the rotational speed is usually set at 800-1200r/min to enhance shear; The slurry of high viscosity lithium battery positive electrode material needs to be controlled at a speed of 400-600r/min to ensure dispersion effect while avoiding overheating of the system.

The specification of sand grinding medium is the core element for precise control of material particle size, and its particle size, hardness, and material directly determine the grinding accuracy. The particle size of the medium is positively correlated with the target particle size of the material. When processing micron sized materials, using 2-5mm zirconium beads can meet the requirements; If the material needs to be ground to the nanometer level, it needs to be replaced with a 0.1-0.5mm ultrafine zirconia medium. The hardness of the medium should be higher than that of the material, otherwise there is a risk of medium wear and contamination of the material. For example, when grinding ceramic powder, a corundum medium with a Mohs hardness of 9 or higher should be selected. In addition, the medium filling rate should be controlled within 70% -80% of the grinding chamber volume. If it is too low, it will reduce the frequency of grinding contact, while if it is too high, it will cause the media to squeeze each other, reducing grinding efficiency.

The volume of the grinding chamber is closely related to production efficiency and processing uniformity, and should be selected reasonably according to the production scale and material characteristics. The small volume grinding chamber (1-5L) is suitable for laboratory research and development or small batch production. Its advantage lies in more uniform material mixing and the ability to quickly respond to parameter adjustments; The large volume grinding chamber (50-500L) is suitable for industrial mass production, but it needs to be combined with multiple sets of dispersion disk structures to avoid insufficient local grinding due to uneven flow velocity inside the chamber. It is worth noting that the volume of the grinding chamber needs to be matched with the feeding rate. Feeding too fast can easily lead to insufficient residence time of the material in the chamber, resulting in "overcurrent" phenomenon; If the feeding is too slow, it will increase the production cycle and raise energy consumption costs.

The dispersed disk structure affects the dispersion and grinding effect by changing the flow field characteristics, and different structures are adapted to different material systems. The axial impact force generated by the paddle type dispersing disc is strong, suitable for handling block materials that are prone to agglomeration, and can quickly disperse large particles; The toothed disc dispersing disc generates strong shear force through a dense toothed structure and is suitable for materials such as ink and dyes that require ultrafine dispersion. In recent years, the combination type dispersing disc has emerged, which combines the blade and toothed disc structure, providing strong impact force and precise shearing, and can adapt to the entire process from coarse dispersion to fine grinding. In addition, the diameter and installation height of the dispersion disk also need to be optimized. A diameter that is too large can easily cause wear on the cavity wall, while an installation that is too high can prevent the bottom material from fully circulating.

The collaborative matching between various parameters is far more important than optimizing a single parameter. For example, when selecting ultrafine sand grinding media, it is necessary to reduce the stirring speed to avoid medium breakage; A large volume grinding chamber needs to be equipped with a large-diameter combined dispersing disk, and the medium filling rate should be increased to ensure processing uniformity. In the production of new energy materials, when processing lithium iron phosphate powder, the speed needs to be set to 500r/min, combined with 3mm zirconia medium, 50L grinding chamber, and toothed disc dispersion disk, in order to achieve the requirement of D50 ≤ 1 μ m particle size while ensuring the dispersion and activity of the powder.

The treatment effect of the sand grinding and dispersing mixer is essentially the result of the synergistic effect of various technical parameters. From energy regulation of stirring speed to precision control of sand grinding medium, from adaptation of grinding chamber volume to flow field optimization of dispersing disk structure, each parameter needs to be precisely set around material characteristics and production requirements. With the development of intelligent manufacturing, automated control and real-time monitoring of parameters will become a trend, further improving the stability and accuracy of equipment processing, and providing strong support for material production.