The classification (or dimensional classification) of materials has the goal of:

  • Producing particle-size diameters for commercialisation (calcareous aggregates, charcoal grades, plastic pellets, wood pellets, etc.);
  • Preparing materials for a differentiated downstream processing of the particle-size classes which constitute it (granulating fines and fragmentation of coarse grains)
  • Preparing materials to for a demanding treatment prior to a defillering (dedusting) or conversely a removal of fractions which are too coarse.

In the case of mixed materials, it also enables carrying out a first stage of purification or concentration of one of the components, a principle followed in certain waste recycling processes in particular.

The choice of classification techniques is primarily dictated by the grain size of the material to be treated: for grain sizes larger than 500 µm, the path taken will be one of dry or wet screening, whilst for finer grain sizes, pneumatic classification or hydraulic classification are preferable.

Our expertise
In mineral processing