The finer the particles tob e produced, the higher the energy that is needed fort he production. That is why we at Hosokawa develop technologies allowing our customers to produce finer and finer particles at reduced energy consumption. The PULVIS, a combination of a vertical agitated ball mill and a high performance air classifier represents a further milestone on our way.

The PULVIS offers a compact, low-abrasion and low-energy fine grinding, even of hard materials such as ceramic raw materials or glass to less than 0.5 μm in the d50 and <2 μm in the d97.
Compared to wet grinding, the particle size distribution is much steeper with a sharply defined top cut. Energy savings compared to jet milling are up to 40 %..

The milling part is located at the bottom oft he machine. Feed material is ground by agitated mediat hat combine impact grinding and attrition. The gasflow injected from the bottom side transports and cools the particles on their way thorugh the grinding media. Ground particles are conveyed by air, passing through the grinding chamber tot he classifier. The classifier separates the reqired fine product from coarse particles. The coarse particles return tot he grinding zone for further grinding.

  • Compact design
  • From Laboratory to production scale, with possibility to scale-up over complete range
  • Energy efficient: With high grinding efficiency specific energy consumpiton is reduced by more than 80 %. Finer particle sizes are possible compared to jet milling.
  • Adjustable particle size: Fineness is determined by changing the classifier speed.
  • Ultra fine particles: The compact unit reliably produces very fine products with particles sizes in the sub-micron range.
  • Easy assembly: disassembly and cleaning are achieved with this design. Ideal machine for frequent material changes.

The PULVIS ist he right choice fort he ultra-fine grinding of hard, temperature un-sensitive materials. In the grinding process also addivives can be used. Typical application for the PULVIS are for example:

  • Anorganic pigments
  • Ceramic materials
  • Metal oxides
  • Battery materials
  • Industrial materials
  • Glass, glass frits
  • Hydrogen adsorbent alloy
  • Magnetic materials (process with inertgas)
  • Graphite

Grinding parts and classifying parts are available

  • In various ceramic qualities grinding beads
  • Alumina or zirconia (grades)
Brochure PULVIS

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