During dry grinding, materials undergo repeated high-speed impacts with other particles, media, or rotors inside a restricted area. The grinding proceeds non-stop until the materials reach the target particle size, and dry grinding can even refine materials to micron-scale dimensions.
Dry grinding is a dry-environment material crushing process that uses no liquid media (or minimal auxiliaries). It crushes solid materials via mechanical forces (impact, extrusion) from equipment like impact crushers, jet mills, and ball mills, with finished particle size controlled by adjusting grinding parameters. It is widely used in mineral processing, chemical, and pharmaceutical industries.
Compared to wet grinding, dry grinding needs no dehydration, saves energy, and produces no wastewater—lowering production and environmental costs. However, it generates dust (requiring dust removal for safety) and is ideal for moisture-sensitive materials due to its dry operation.
Control the initial particle size of materials and crush them to an appropriate range in advance, remove impurities, agglomerates and excess moisture, reduce grinding load, and avoid agglomeration, adhesion and equipment blockage during the grinding process.
Select matching media materials according to material hardness, reasonably match media particle size with target fineness, and ensure effective collision and grinding efficiency between media.
Optimize the rotational speed of the grinder to form an ideal movement trajectory, set a reasonable grinding time through phased sampling and testing, ensure materials meet the standards and avoid over-grinding.
Select dispersants or surfactants suitable for materials, reduce the surface tension of materials, and strictly control the dosage to prevent secondary agglomeration of fine powder.
Regularly inspect and replace vulnerable parts such as grinding chambers and liners, maintain good sealing and heat dissipation performance of the equipment, and avoid excessive temperature affecting grinding characteristics.
Equip efficient classification equipment to separate qualified fine powder in time, optimize the material circulation path, and ensure that unqualified coarse powder returns to the grinding chamber for secondary grinding to improve the overall yield.
