At present, there are various processing requirements in the powder industry. With the increasingly fierce competition in the powder industry, more and more customers want more refined materials, and the powder industry is also developing in the direction of nano-powders. The previous single treatment method is no longer applicable, so some related nano-powder preparations will be found, which has become a key problem for some enterprises.
The nano-scale is achieved by physical mechanical grinding methods, namely dry grinding and wet grinding. For nano-powder manufacturers, it is more desirable to obtain nano-powders by dry grinding. However, when the dry mill grinds powder, the temperature of the powder will rise sharply due to the introduction of a large amount of energy, and when the powder particles are refined, how to avoid explosion-proof problems, etc., are difficult to control by the dry mill. . Therefore, the wet grinding method came into being. The powder obtained by grinding with a wet grinding machine is a very effective and economical method. Wet grinding also avoids the high cost of chemical nano-powder manufacturing, and avoids the insufficiency of mechanical dry grinding that the fineness is difficult to achieve nano-scale powder. Generally, the particle size of dry grinding can only be ground to about 8um. If you want to achieve finer or nano-scale, you have to use wet grinding.
Dry grinding means that the water content of the material does not exceed 4% during the grinding operation, while wet grinding is to suspend the raw material in the carrier liquid stream for grinding, and appropriately add dispersants and other auxiliary agents to help the grinding. When the moisture content of the material exceeds 50% in the wet grinding machine, the problem of dust flying can be overcome. In food processing, the ground material is often used as a preparatory operation for leaching, so that the components are easily dissolved, so it is suitable for wet grinding. However, wet operation generally consumes more energy than dry operation, and equipment wear is also more serious.
Mechanical dry grinding is difficult to obtain sub-micron powder, and the cost of chemical powder is high. Therefore, wet grinding has become another high-quality choice for preparing ultra-fine powder. From the perspective of practical application, there is no absolute difference between the two, and the appropriate treatment method should be selected according to the actual product characteristics and economic benefits.
www.mixerbeadmill.com
