Rotary Coolers

From pilot scale units, to commercial size coolers, we have the knowledge and experience to build a rotary cooler that’s right for you. FEECO’s rotary coolers are custom designed and built to meet the needs of your process. Whether you require short or long residence times, carbon steel or specialty steels, FEECO can design a rotary cooler for your application.


Rotary coolers work by tumbling material in a rotating drum in the presence of chilled or ambient air. The drum is set at a slight horizontal slope to allow gravity to assist in moving material through the drum. Lifting flights maximize heat transfer efficiency by lifting up material and dropping it through the chilled air as the drum rotates. Indirect water deluge coolers are also available.



  • Diameter: 3′ – 15′ (1 – 4.6m)
  • Capacity: 1 TPH – 200 TPH (1 MTPH – 181 MTPH+)
  • Custom flight design and layout to maximize efficiency
  • Counter-current flow design to optimize cooling efficiency
  • Durability in construction for long life
  • Process and Mechanical Warranties
  • Various Drive Assemblies Available

Optional Components:

  • Trommel
  • Liners
  • Leaf Seals
  • Graphite Seals
  • Machined Bases
  • Screw Conveyor Feeder
  • Automatic Gear Lubrication System
  • Exhaust Handling Equipment
  • Ductwork

Material Options:

  • Carbon Steel
  • Stainless Steel
  • Specialty Alloys
  • Explosion Bonded
  • AR Steel

FEECO is capable of meeting the requirements necessary for CE marking equipment.

Automated with Rockwell Automation

All FEECO equipment and process systems can be outfitted with the latest in automation controls from Rockwell Automation. The unique combination of proprietary Rockwell Automation controls and software, combined with our extensive experience in process design and enhancements with hundreds of materials provides an unparalleled experience for customers seeking innovative process solutions and equipment.

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Rotary Cooler Components and Parts

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

Mechanical Construction of a Rotary Cooler (3D Rotary Cooler by FEECO International)

Rotary Cooler Components & Parts


  • A – Material Discharge Breeching
  • B – Flights
  • C – Riding Ring
  • D – Ring Gear Guarding
  • E – Discharge Air
  • F – Raw Material Feed Chute
  • G – Girth Gear
  • H – Pinion Gear
  • I – Coupling Guarding
  • J – Gear Reducer
  • K – Drive Assembly
  • L – Thrust Roller Assembly
  • M – Riding Ring
  • N – Trunnion Wheel
  • O – Graphite Block Lubrication Assembly
  • P – Trunnion Guarding
  • Q – Pillow Block Bearing
  • R – Product Discharge


Applications & Materials

Rotary coolers can lend themselves to nearly any industrial cooling need, but typical applications include:


  • Potash
  • Reclaimed Dust
  • Rubber Pellets
  • Salts & Sugars
  • Sand
  • Steel Mill Waste Sludges
  • Urea Prills & Crystals

Indirect Rotary Coolers

FEECO offers indirect rotary coolers for unique processing needs.

Mechanical Construction of an Indirect Cooler (3D Indirect Cooler by FEECO International)

Indirect Cooler Components & Parts


  • A – Water Trough
  • B – Cooler Feed
  • C – Water Collection System
  • D – Product Discharge




Indirect rotary coolers rely on heat transfer through the drum shell to cool material, utilizing cool water bathed over the drum as it rotates in order to cool the drum shell and subsequently the material within. This method, commonly called “indirect water deluge,” is ideal in situations where lightweight materials such as pigments or other powders could become entrained in the air stream of a direct cooler, resulting in product loss.


Another reason for utilizing an indirect rotary cooler is that it allows for keeping a controlled environment within the cooler, for example, in situations where material will oxidize or burn should it come into contact with air.


Indirect rotary coolers can be designed as part of a recycle circuit, where warm water coming off the drum is run through a heat exchanger to cool it and send it back to the beginning of the process. They can also be integrated into existing systems.



  • Stainless steel shell to prevent corrosion
  • Custom design to suit exact processing needs
  • Increased efficiency with the use of a water deluge system
  • Various Drive Assemblies Available


  • Pigments
  • Ultra fine materials


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