Dry Grinding and Wet Grinding

For nano powder manufacturers, they certainly hope to obtain the final nano powder by dry grinding. However, if the powder is ground by mechanical grinding, the temperature of the powder will rapidly increase due to the introduction of a large amount of energy during the grinding process. Moreover, how to avoid explosion-proof problems when the particles are finely refined is difficult for the grinding machine to control.


So generally speaking, the particle size of dry grinding can only be ground to 8 μ m.  If you want to get partical size below 8 μm,  wet grinding must be used.


The so-called wet grinding is to mix the nano powder with appropriate solvent to prepare appropriate materials. In order to avoid powder agglomeration during the grinding process, it is necessary to add appropriate dispersants or additives as grinding aids.


If you want the final nanoscale product to be powder rather than slurry, you need to consider how to filter the large particles in the slurry first and how to dry the filtered slurry to obtain nanoscale powder.


Therefore, when obtaining nanoscale powders through wet grinding, the selection of appropriate solvents, additives, filtration methods, and drying methods will affect the key technologies for successfully obtaining nanoscale powders.


Dry grinding generally uses ball milling tanks or ball mills, while zirconia beads are made of larger balls such as 5, 6, 8, 10, 15, and 20mm zirconia balls.


The size of zirconia beads used for wet grinding needs to be determined based on the initial particle size of the material and the final fineness obtained.

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