The universal talent: 
Heyd separator

oldie but goldie

With a separation cut between approx. 60 µm to 200 µm, the Heyd classifier improves the quality of the end product enormously, and still remains a comparatively inexpensive investment. The Heyd classifier is an all-in-one unit - cyclones or filters for fines separation as well as a process fan are not required. An integrated adjustable fan impeller and a counter-blade mechanism ensure optimum fines discharge.

Technical details

  • Separating cut between approx. 60 µm to 200 µm.
  • Only one unit. Cyclones or filters for fines separation including the process fan are not required
  • Integrated adjustable fan impeller and counter impeller for optimum fines discharge
Heyd classifier

more than 1,000 installations worldwide

What is the function of a separator?

The separator classifies the material stream into two partial streams depending on the particle size. The separator is charged with powdered material, consisting of particles of different sizes, in a continuous process. It defines the finer particles as the finish product by selecting them from the feed material. The rejected coarse particles and the non-selected fine particles are fed out of the separator as a second mass flow.

What is the function of the jalousy ring in classifiers with a rotating basket?

The jalousy ring serves as a static pre-classification device to define the amount of material passing to the rotating cage. At the same time, it limits the space around the rotating cage which makes it easier to adjust the flow conditions.

What does the term "loading factors" mean?

We often talk about two loading factors with regards to the separator. The feed loading and the fines loading in [kg/m³]. It means the mass of the respective fraction per air volume.

The higher the permissible loading factors, the smaller the separator can be designed to classify the required tonnages. Permissible loading factors mean the lowest value under which a separator can still effectively and reliably fulfill its function. Coarse material loading is not relevant in this context because it has no influence on the functionality of the separator.

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Competence Center

Precise analysis for the perfect result.

We analyse your product to design the most efficient grinding plant.

  • Technology center for material tests 
  • Laboratory for material analysis
Christian Pfeiffer pilot plant
A story of efficiency

Efficiency in grinding is our heritage and our future.
Since 1925.

Making grinding processes as efficient as possible is a science in itself – one to which we dedicate our entire expertise and spirit of innovation. From the invention of the first MONOBLOC diaphragm to the technical fine-tuning of the separator QDK. How we became what we are today.