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Rotary Calciners

Rotary calciners, also commonly called indirect kilns, are used in various calcination operations where exhaust gases must be minimized, when processing finely divided solids, or where temperature must be tightly controlled along the length of the kiln.


A calciner is comprised of a rotating drum inside a furnace, which is externally heated. Unlike direct-fired kilns, which utilize direct contact between the material and process gas to carry out processing, in a calciner, heat is transferred from the shell of the externally heated kiln to the bed of material through radiation.


FEECO offers a unique testing facility where we use batch and continuous pilot equipment to simulate production conditions, allowing us to test small samples of your material under various conditions and develop a process around the unique needs of your material. Specifically, we offer a direct batch kiln, indirect batch kiln, direct continuous kiln, and indirect continuous kiln.


The batch and pilot direct-fired equipment can be configured to include the following: combustion chamber, afterburner, baghouse, quench chamber, and wet scrubber.

Calciner Components and Parts

The image below shows the standard components of a calciner. Click image to view larger.

Mechanical Construction of a Calciner (3D Calciner by FEECO International)

Applications & Materials

  • Thermal Desorption of Organic Impurities or Hazardous Wastes
  • Charcoal Production & Activation
  • Catalyst Activation
  • Reduction Roasting
  • Tire Pyrolysis
  • Plastics Processing


Project Profiles

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Rotary Calciner Articles

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Why Choose FEECO?

Our rotary calciners are heavy-duty, robust pieces of equipment backed by over 60 years of thermal processing experience. We can also offer accessories for maximizing efficiency, such as bed disturbers for rotating the bed of material and ensuring even heat transfer.

Our Commitment to Quality
Quality-RibbonOur company was founded on the idea that we could do things better; that if we put our minds to it, we could produce the best in industrial processing equipment.
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