Microniser

The Microniser is a classical spiral jet micronising mill utilising compressed gas to produce superfine materials by autogenous comminution.

Compressed air is most commonly used but steam is favoured for some applications and inert gases may offer advantages for particularly sensitive materials or materials with explosion risks.

The feed material is inspirated by a small proportion of the compressed gas through a venturi into the grinding chamber where numerous angled nozzles accelerate the material into particle-particle impact. There are no moving parts in the mill and no mechanical forces are applied to the grinding process.

The centrifugal movement of particles in the chamber provides effective classification to control product particle size. Products will typically be less than 10 microns. The mill is usually manufactured in stainless steel and can be supplied with various abrasion resistant linings. For pharmaceutical purposes it can be supplied within a full isolation system.

The particular advantages of this type of mill are:

  • it produces a uniform particle size and shape;
  • it is very easy to clean and can be used for campaign grinding;
  • it can be used for hygienic or sterile applications;
  • it will process heat sensitive materials;
  • materials can be blended during the grinding process;
  • materials can be coated with surfactants during the process.

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Technical Data

Units M2 M3 M4 M6 M8 M12 M15 M20 M24 M30 M36
Mill size mm 50 75 100 150 200 300 400 500 600 750 900
Capacity (approx.) kg/h 1 1-2 2-5 5-20 15-50 50-150 75-250 100-350 250-550 450-1,500 900-2,300
Air operation
(Free air, 7 bar)
m3/min 0.6 1.0 1.5 2.0 3.0 6.5 10.5 15.5 28.0 42.5 70.0
Steam operation
(Superheated, 14 bar 400°C)
m3/min - - - - 115 270 450 680 1,200 2,000 3,000