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Rotary Dryer

Rotary Dryer

Rotary dryer is a kind of continuous rotating drum drying equipment with direct heating source. It is used to dry limestone, sand, coal, slag, clay, wood chips,sawdust, mining powder etc.

  • <10mmFeed Size
  • 3-110KWMotor Power
  • 1-75 t/hProcessing capacity

What is rotary dryer?

Rotary dryer is mainly used for drying various mineral materials, and it is a special equipment for drying and dehydrating high-humidity materials. The heat source of the dryer comes from the combustion device, which can be used in the way of down-flow or counter flow heating. The rotary drum dryer is mainly used in building materials, metallurgy, chemical plant, cement plant for drying of limestone slag, coal powder, slag, clay stone and so on. This dryer is particularly suitable for drying big granules in chemical industry, minerals, metallurgy industry. It can also dry special powder and granule material, such as lightweight calcium carbonate, floridian, magnetic particle, graphite, limestone, sand, coal, slag, clay, wood chips, mining powder etc.
drying sand drying coal
rotary sand dryer plant
drying sand drying coal

How to choose rotary dryer?

Rotary dryers are useful in a variety of industrial applications and choosing the right dryer can enhance the efficiency of your entire materials processing system.The following are the general principles for the selection of drying equipment:

Material properties. Different material characteristics will affect drying efficiency. To ensure that thermal processing meets production targets. When selecting a rotary dryer, consider key material characteristics such as: Water content of raw material, the water content of the air outlet meets the standard, the specific heat of the material being processed, heat transfer characteristics of the material being processed, material granule size, material surface quality (abrasive, corrosive, etc.).

Direct or Indirect Heat application. Direct heat rotary dryers pass a stream of drying air through the drum. The drying air is directed in either a co-current flow (flowing the same direction as the material), or counter-current flow (moving in the opposite direction of the material). Direct dryers are the most common choice for drying bulk solids. If material to be dried cannot come into contact with oxygen, or needs a completely inert environment, an indirectly heated rotary dryer is a choice.

Rotary dryer plant surroundings. Things such as the surrounding atmosphere, air temperature, humidity, and elevation, will affect the dryer’s performance. For example, an increase in elevation means a decrease in the amount of oxygen in the atmosphere, making the air less dense and less combustible. Therefore, the dryer’s fan size may need to be increased to compensate at higher elevations.

A large number of components can be customized to meet most processing requirements. Additional customizations such as percussion systems, sealing options and structural materials can be combined to create an efficient drying solution that suits your unique processing requirements.

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  • High Quality

    High heat efficiency. Inner dryer wall plate is weld in spiral, which increase the drying efficiency and larger capacity.

  • Customized Design

    The pin-pin replaceable gear is used to replace the traditional cast steel gear. It greatly reduces the maintenance cost and time.

  • Good Performance

    It can be used to dry powder or granular materials. For those materials with adhesion, it can be equipped with striking device to avoid wall sticking.

Product features

4.Drying factors can be adjusted, such as concentration of feeding liquid/thickness of material film, temperature of heating medium, rotating speed of the drum etc, which can change drying efficiency.

  • coal dryer
  • sand drying machine
  • miniral rotary dryer
  • rotary drum dryer

Working principle

Rotary dryers consist of a horizontally inclined rotating cylinder. Material is fed at one end and discharged at the other end. In direct-type rotary dryers, hot gases move through the cylinder in direct contact with the material, either with or against the direction of its flow. The cylinder is equipped with flights, which lift the material and shower it down through the hot gas stream.

rotary dryer working pricinples


(Dia.x Length mm)
Volume(m³) Capacity (t/h) Gradient(%) Highest Inlet Air
Rotate Speed(r/min) Main Motor(kw)
Φ600x6000 1.7 0.5-1.5 3~5 700~800 3~8 3
Φ800x8000 4.1 0.8-2.0 3~5 700~800 3~8 4
Φ800x10000 5.1 0.8-2.5 3~5 700~800 3~8 4
Φ1000x10000 7.9 1.0-3.0 3~5 700~800 3~8 7.5
Φ1000x12000 9.4 1.2-3.2 3~5 700~800 3~8 11
Φ1200x8000 9 1.9-2.4 3~5 700~800 3~8 7.5
Φ1200x10000 11.3 2.2-3.0 3~5 700~800 3~8 7.5
Φ1200x12000 13.6 2.4-3.2 3~5 700~800 3~8 7.5
Φ1500x12000 21.2 4.5-5.7 3~5 700~800 2~6 15
Φ1500x14000 24.7 5.3-6.6 3~5 700~800 2~6 15
Φ1500x16000 26.5 5.7-7.1 3~5 700~800 2~6 15
Φ1800x12000 30.5 6.5-8.1 3~5 700~800 2~6 18.5
Φ1800x14000 35.6 7.6-9.5 3~5 700~800 2~6 18.5
Φ1800x16000 40.7 7.8-10.2 3~5 700~800 2~6 18.5
Φ2000x18000 56.5 8.4-12.3 3~5 700~800 1.5~6 22
Φ2000x20000 62.8 9.0-13.6 3~5 700~800 1.5~6 22
Φ2200x16000 60.8 11.4-15.8 3~5 700~800 1.5~6 22
Φ2200x18000 68.3 12.8-16.2 3~5 700~800 1.5~6 22
Φ2200x20000 75.9 13.0-16.5 3~5 700~800 1.5~6 30
Φ2400x16000 72.3 13.5-16.9 3~5 700~800 1.5~5 37
Φ2400x18000 81.4 17.4-21.7 3~5 700~800 1.5~5 45
Φ2400x20000 90.4 19.3-24.1 3~5 700~800 1.5~5 55
Φ2600x24000 127.4 27.2-34.0 3~5 700~800 1.5~5 75
Φ2600x28000 148.6 28.6-36.2 3~5 700~800 1.5~5 75
Φ3000x20000 141.3 30.1-37.7 3~5 700~800 1.5~5 85
Φ3000x25000 176.6 37.7-47.1 3~5 700~800 1.5~5 90
Φ3200x25000 201 42.9-53.6 3~5 700~800 1.5~5 110

*The output will vary according to different materials, feed particle size and other factors