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Powder Processing

» Overview

Powder technology largely consists of the following elements: grinding, blending, preparing and transporting. Depending of the grinding stock and the energy input, each of these process steps is accompanied by a more or less pronounced abrasive wear of the equipment. At the critical points of the processes, ceramic components are integrated as a wear protection. At the same time, this prevents any contamination of the grinding stock and is effective both in the classical sliding wear and in the more critical impact wear.

Typical cases of application are as follows:

  • Classifiers are aggregates used to classify the powder. The high input of kinetic energy required to this effect loads the components through strong abrasion. This effect can be handled by using ceramic materials.
  • Dust extracting plants/cyclones are effectively protected against abrasion if lined with ceramics at the problematic zones which significantly extends their lives.
  • Mills are lined by means of plates, mosaics or molded parts. Aluminum oxide is often used as a material to this effect because of its good wear resistance. Depending on the grinding process, even the hardness of the material can contribute to the grinding effect of the mill.
  • Rotary star valves seal the grinding chamber from its environment; however, they allow the grinding stock to flow. A good dimensional stability is required here.
  • Grinding media can be designed as loose grinding balls or as a solid grinding disk. The decisive factor is a high wear resistance though, which increases the life of the grinding media and avoids any contamination of the grinding stock. Another aspect is the high grinding effect with a low energy input.
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