NEA GRC Guide Ring Classifier


The GRC guide ring classifier from NEUMAN & ESSER is a latest generation high-efficiency air separator, which offers top yields, precise separation limits and minimum energy requirements. It can be operated as an independent aggregate and combined with a mill.

The feed material is fed from the top using a vertical pipe. After the feed material drops into the dispersion unit, it enters the classification zone. 

The air required for classification carries the particles to the classifier wheel. Small particles, the fine materials, are being pulled through the classifier wheel by the classifying air. The fine material is then separated from the air in the following filter.

The classifier wheel rejects particles which are too large and they reach the bottom of the classifier as coarse material. An airlock discharges this material there.

Superfine classification with Guide Ring Classifier GRC

The fine material with a particle size of up to 2 µm is seperated from the air flow by the downstream filter. Various versions of the GRC Air Classifier are available for higher outputs and different applications. The typical uses for the guide ring classifier range from minerals via pigments and paints to the chemicals and food sectors. However, the NEA GRC can also be used to separate substances or to generate fractions which require an increased concentration of a specific substance. The application fields here range from the recycling area to protein enrichment.


  • Maximum yield due to integrated pre-dispersion
  • Particle size topcut: 2 μm – 200 μm
  • Throughput: 50 kg/h – 50.000 kg/h
  • Classifier power: 10 kW – 300 kW
  • Air quantity: 1.000 m³/h – 40.000 m³/h
  • Feed material particle size: max. 3 mm – 5 mm
  • Diameter: up to 2.000 mm


  • Highly efficient pre-dispersion unit for maximum separation efficiency
  • Top separation precision due to innovative air guidance for defined air and material flow
  • Unsurpassed throughput and energy efficiency due to a unique combination of dispersion and classification
  • Easy to combine with existing grinding systems (e.g. ball mills, pendulum mills, and impact mills)
  • Optional wear protection


  • Fertilizers
  • Oilfield minerals
  • Pigments & paint
  • Clay & ceramics
  • Gypsum
  • Technical limestone cycle
  • Minerals
  • Protein enrichment
  • Recycling

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