Whatsapp: 86 18153792542 Email: mt15@mitr.cn
How to deal with the problem of powder agglomeration after wet grinding in the planetary ball mill?
Release time:
Jul 23,2025
Planetary ball mills are widely used in the grinding and processing of materials in various industries, with two types of grinding methods: dry and wet. However, most of the ball mills currently used in the market are wet ball mills, which have a more environmentally friendly working environment. However, one drawback is that after wet grinding and drying, the ball mill will produce powder clumping, seriously affecting work efficiency.
The following methods can be used for processing: For powders that have already clumped, agate mortar can be used for simple grinding, crushing the clumped powder and then sieving it to restore the powder to a finer state.
Preventive measures:
Control drying temperature: If the drying temperature is too high, it will enhance the activity of the powder and cause clumping. The drying temperature should be controlled below 80 degrees Celsius to effectively alleviate the phenomenon of clumping. For example, for some metal oxide powders, setting the drying temperature at around 50-60 degrees can significantly reduce the occurrence of agglomeration.
Add dispersant: add some inert solid substances, such as stearic acid, etc. when grinding the ball mill, or use surfactant or polymer reagent as dispersant, which can play a dispersing role and prevent agglomeration after drying. However, make sure that these additives do not affect the grinding results. For example, when grinding ceramic powder, an appropriate amount of sodium polyacrylate can be added as a dispersant, which can effectively improve the dispersion of the powder.
Use appropriate grinding aids: select appropriate grinding aids according to material characteristics, such as alcohol, etc. Grinding aids can reduce the reconnection of the ground particles of materials and reduce the possibility of caking. Taking grinding silicon powder as an example, adding appropriate amount of alcohol as grinding aid can avoid caking to a certain extent.
Optimize the grinding process: properly control the rotation speed of the ball mill to avoid excessive collision and agglomeration of materials caused by excessive rotation speed. At the same time, we can try to adjust the process parameters such as grinding time, type and quantity of grinding media according to the nature and agglomeration of materials, so as to obtain better grinding effect and dispersion.
Improve drying conditions: special drying methods such as vacuum drying and freeze drying can be used to replace traditional oven drying. These methods can remove moisture at a lower temperature and reduce the possibility of powder caking. For example, for some temperature sensitive nano material powders, freeze-drying can effectively maintain the dispersion of the powders.
keywords
Previous Page:
:Next Page
Previous Page:
Next Page: