The drying or calcination of powdery substances frequently takes place in continuous systems. However, complex charges are rather treated in batches. Our rotary tube furnaces permit the heat treatment also under process gas or in vacuum.

Continuous systems
  Under normal atmosphere:
   Continuous belt furnaces
   Rotary tube furnaces
  Under vacuum or process gas:
   Rotary tube furnaces

Batch furnaces
   Retort tube furnaces
   Hood type furnaces