The finer the particles to be produced, the higher the energy that is needed for the 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 of the machine. Feed material is ground by agitated media that combine impact grinding and attrition. The gasflow injected from the bottom side transports and cools the particles on their way through the grinding media. Ground particles are conveyed by air, passing through the grinding chamber to the classifier. The classifier separates the required fine product from coarse particles. The coarse particles return to the 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 consumption 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 particle sizes in the sub-micron range.
  • Easy assembly: disassembly and cleaning are achieved with this design. Ideal machine for frequent material changes.

The PULVIS is the right choice for the ultra-fine grinding of hard, temperature un-sensitive materials. In the grinding process also additives 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
Brochure Dry Ultrafine Grinding of Minerals

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Planning the entire process

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