Definition
Sanding disperser is a kind of wet processing equipment used for fine grinding and dispersion of materials. It crushes and grinds solid particles in liquid medium by mechanical force, and disperses them evenly, so as to reduce particle size, improve distribution uniformity and improve system stability. This equipment plays a key role in the research and production of many industrial fields such as coatings, inks, new energy, ceramic glazes, electronic pastes, etc.
Principle
The core working principle of the sand disperser is based on energy transfer and shear action. The equipment is mainly composed of a grinding chamber, a dispersion shaft, a grinding medium (usually zirconia beads, glass beads, etc.) and a cooling system. When working, the pre-mixed slurry is pumped into the grinding chamber filled with grinding media, and the high-speed rotating dispersion shaft drives the movement of the grinding medium. The particles in the slurry are strongly squeezed, sheared and collided between the grinding media and between the media and the inner wall of the cavity, so that they are effectively crushed and dispersed. The entire process is usually accompanied by cooling to control the heat generated by the conversion of mechanical energy and prevent changes in the properties of the material. The grinding effect can be roughly related to the input energy density and action time.
Measurement and evaluation methods
The measurement of the treatment effect of the sand grinding disperser mainly revolves around the fineness and stability of the final slurry. The fineness is usually quickly assessed using a scraper fineness meter, and the particle size range of large particles is judged by observing the appearance of the slurry particles in the trenches. More accurate particle size distributions are measured using a laser particle size analyzer. Dispersion stability can be indirectly evaluated by observing the delamination of the slurry after resting, measuring the settling rate, or analyzing the surface charge of the particles using a zeta potentiometer. In addition, the viscosity change, color and gloss of the slurry before and after treatment are also important evaluation indicators in related application fields.
Influencing factors
The final treatment effect of the sanding disperser is affected by the synergy of multiple factors. The material, particle size, and filling rate of the grinding media are key parameters, and smaller media particle sizes can provide more contact points, which is conducive to finer products but may affect flow and capacity. The linear speed of the dispersion shaft directly affects the size of the shear force, which needs to be adjusted according to the hardness of the material and the target fineness. The initial particle size, solids content and viscosity of the material determine the ease of pumping and grinding, and usually require moderate pre-dispersion beforehand. The structural design and cooling efficiency of the grinding chamber are related to the energy utilization rate and the temperature control stability of the production process. In addition, the feed flow rate and the number of cycles of grinding together determine the effective residence time of the material in the grinding area, which directly affects the final dispersion fineness.
Applications
The application of sanding disperser is very wide. In the coatings industry, it is used to fully disperse pigment particles in resin systems for excellent hiding power and color. In the field of inks, its grinding of toner and color pigments is a key step in ensuring print quality. In the new energy industry, such as the preparation of lithium-ion battery cathode and anode slurry, it is crucial for the uniform dispersion of active substances, conductive agents and binders. In addition, in the preparation of ceramic glazes, pesticide suspensions, dyes and some nanomaterials, the sand grinding disperser also plays an irreplaceable role, and is one of the core equipment to achieve product performance uniformity and stabilization.
Equipment selection considerations
Choosing the right sanding disperser is a systematic project that takes into account the process requirements and equipment characteristics. First, the final fineness, production capacity and material characteristics (such as corrosiveness, viscosity, solid content) of the target product should be clarified. According to the fineness requirements, the particle size range and material of the grinding medium are preliminarily determined. The effective volume, spindle power and pumping method of the equipment are selected according to the production capacity and material characteristics. The cooling system needs to be configured to meet the temperature control requirements of the process. For products with high added value or sensitivity to metal ion contamination, consider grinding chambers lined with ceramics or special alloys. At the same time, equipment scalability, ease of operation and maintenance, and operating costs are also important long-term considerations. It is recommended to obtain key process parameters through small or pilot test verification before large-scale equipment selection.