Long Gap Mill Pulverizer

The pulverizing action of the Rotormill is supplied by a rotor that spins at high speed. This rotor is supported by heavy-duty bearings, which are located at either end of the shaft. This provides stability necessary for greater material loading while also extending bearing life. The bearings are out of the grinding chamber and are protected from contamination.

Two Sections of the Rotor

  • At the bottom is a fan that provides the airflow for the grinding system. In addition, the fan helps to accelerate and distribute the feed material before the material entering the grinding chamber.
  • The top section is the grinding part of the Rotormill. It consists of several rows containing grinding plates that accelerate the air causing it to react with the grooved lining of the Rotormill. This interaction creates miniature pockets of rotating air at very high velocities. This air stream causes the particles to collide with each other and disintegrate while the rapidly moving air stream instantly absorbs the heat caused by the size reduction.

Adding an Optional Dynamic Air Classifier 

Finely ground material will pass through the classifier blades to collection, while larger particles will be flung outward by centrifugal force into an adjustable recycle port for regrinding. The classifier speed may be changed to control the size particles that are rejected.

Fine Milling a Wide Variety of Materials

Adjustment of the grinding plates, the style of grinding plates, and air flow, permit the fine milling of a wide variety of materials at high production rates without the temperature rise normally associated with the grinding of fine powders. Many heat-sensitive materials can be milled without cryogenic processing with a separate variable speed drive.

Carbon or Stainless Steel

Rotormills can be constructed in carbon or stainless steel. Interiors can be furnished with hardened material for extended life, for grinding abrasive materials.

Wear Parts

Grinding plates and liners can be fabricated from:

  • Ceramic parts
  • Tungsten carbide
  • Abrasion-resistant steel
  • D2 tool steel
  • Tungsten carbide welded overlayments