NSTI Nanotech 2009

Screenless Agitator Bead Mill for the Use of Smallest Grinding Media

S. Mende, J. Hill
NETZSCH Fine Particle Technology LLC, US

Keywords: agitator bead mills, real comminution, deagglomeration, top-down, bottom-up


The company NETZSCH-Feinmahltechnik GmbH is a renowned manufacturer of machines and plants for grinding, dispersing and mixing of solids in liquid and pasty products. For the comminution down to the nanometer size range, or for the dispersion of nano-sized particles, the use of finer and finer grinding media is necessary. Further-more, to avoid changes in the crystal structure of the product, smooth conditions for “Mild Dispersion” processes are very important. With the new agitator bead mill developed by the NETZSCH-Feinmahltechnik GmbH separation of grinding media with a diameter down to 50 microm is possible, even for low stirrer tip speeds. From experience we know that in particular nanotechnology appli-cations often call for metal-free grinding or dispersion. For these applications we have developed a special grinding media separator system called ODC (Open Dy-namic Classifier). The contribution discusses the differences between real comminution, deagglomera-tion and disaggregation processes by the use of real experimental results. Further-more the advantages of the innovative new ODC-System will be explained.
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