Air Classifier

Suitable for separating particles of different sizes

Air Classifier

Air Classifier

Suitable for separating particles of different sizes

  • Air Classifier uses centrifugal force, gravity and inertial force to separate particles of different sizes in a medium (usually air)
  • A variety of classifier rotors are available with adjustable output and speed which can be adjusted by frequency conversion
  • Complete closed loop grinding system, resulting in no dust overflow or environmental pollution with low noise levels and easy operation
  • Can be connected in series with grinding equipment such as ball mill, vertical mill or Raymond mill to form a closed loop system
  • Ceramic grinding rotor available for high purity products with no metal pollution
  • Explosion-proof design and nitrogen circulation, suitable for inflammable, explosive or oxidizable materials
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How it works

The material enters the classifier through a feed inlet at its lower end and is then propelled upwards by suction from a fan. As it passes through the classifier, it is subjected to strong centrifugal forces generated by a rapidly rotating turbine. Qualified fine powders pass through blade on the classifier into a cyclone separators or dust collector for collection. Some fine powders carried by course particles collide with walls and fall back down towards secondary air inlets along the cylinder wall. Coarse particles are separated from finer ones due to strong elutriation from secondary air flow; fine particles rise up for further grinding while coarse ones fall out at discharge ports.

Working Principle Of Vertical Single-Rotor Air Classifier
Working Principle Of Horizontal Single-Rotor Air Classifier
Working Principle Of Horizontal Multi-Rotor Air Classifier
Technical Parameters

Horizontal Single-Rotor Air Classifier

Parameter
FW120
FW200
FW280
FW400
FW520
FW630
FW800
FW1000
Production capacity (kg/h) 1~10 10~200 30~500 50~800 100~1500 200~2500 400~3000 800~5000
Product size (D97:μm) 2.5~45 2.5~45 2.5~45 2.5~45 2.5~45 2.5~45 4~45 5~45
Max. classifier wheel rotate speed (metal, rpm) 18000 15000 8000 6000 4450 3550    
Max. classifier wheel rotate speed (ceramic, rpm) 18000 15000   6000 4450 3550    
Classifying efficiency η% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80%
Classifier power (kW) 2.2 3 4 Belt drive 7.5 / Direct connection 7.5 Belt drive 11 / Direct connection 7.5 Ceremic：Belt drive 15；Metal：Belt drive 22/ direct connection 15 22/30 30/37
Max. air flow (m³/h) 300 600~800 1000 1400 2200~2800 3000~3500 5500~6000 8500~9500

Horizontal Multi-Rotor Air Classifier

Parameter
FW400/3
FW400/4
FW400/6
FW630/3
FW630/4
FW630/6
FW800/3
FW800/4
FW800/6
FW1000/3
FW1000/4
FW1000/5
FW1000/6
Production capacity (kg/h) 200~1500 300~2000 1000~6000 1000~6000 2000~8000 3000~12000 2000~7500 3000~10000 5000~15000 5000~12000 8000~16000 15000~20000 20000~24000
Product size (D97:μm) 2.5~45 2.5~45 2.5~45 2.5~45 2.5~45 2.5~45 3~45 3~45 3~45 4~45 4~45 4~45 4~45
Classifying efficiency η% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80% 60~80%
Classifier power (kW) 7.5/11*3 7.5/11*4 7.5/11*6 15/22*3 15/22*4 15/22*6 22/30*3 22/30*4 22/30*6 30/37*3 30/37*4 30/37*5 30/37*6
Max. air flow (m³/h) 4200 5600 11000 11000 14500 22000 17000 22500 33500 26500 35000 43000 52000

Vertical Single-Rotor Air Classifier

Parameter
FL200
FL300
FL360
FL450
FL600
FL800/ITC4
FL900/ITC5
FL1000/ITC6
FL1200/ITC7
FL1500/ITC8
FL2000/ITC9
Production capacity (kg/h) 100~300 200~1000 300~1500 1000~3000 2000~6000 5000~8000 6000~12000 8000~15000 12000~20000 15000~30000 20000~50000
Product size (D97:μm) 5~150 6~150 6~150 8~150 8~150 10~150 15~150 15~150 20~150 25~150 25~150
Max. classifier wheel rotate speed (rpm)   2900 2930 1470 1470 1480   820 490   370
Classifying efficiency η% 60~90% 60~90% 60~90% 60~90% 60~90% 60~90% 60~90% 60~90% 60~90% 60~90% 60~90%
Classifier power (kW) 4 7.5 11 15 22 37 37 45~55 55~75 75~90 90~110
Max. air flow (m³/h) 400~500 2400~2800 3500~4000 4500~6300 8000~11000 14000~18000 18000~25000 26000~30000 32000~45000 50000~60000 80000~110000

Vertical Multi-Rotor Air Classifier

Parameter
FL360/3
FL360/4
FL360/6
FL450/3
FL450/4
FL450/6
Production capacity (kg/h) 2000~6000 4000~8000 6000~15000 3000~9000 5000~12000 8000~24000
Product size (D97:μm) 5~150 5~150 5~150 8~150 8~150 8~150
Classifying efficiency η% 60~90% 60~90% 60~90% 60~90% 60~90% 60~90%
Classifier power (kW) 33 44 66 45 60 90
Max. air flow (m³/h) 9000~10000 12000~15000 18000~24000 15000~18000 18000~24000 27000~32000

Note: The particle size, specific gravity, hardness, and moisture of raw materials are all closely associated to the production capacity. These parameters should only be used as a reference; for more detailed information please consult our engineers.
ALPA is a highly respected name in particle and powder processing, transforming the way the industry views traditional powder processing. Our research and development initiatives have focused on dry grinding, classification and separation, powder shape control and surface modification of particles and powders over the past two decades. As a result, we are proficient in providing tailored, CE-certified products, such as air jet mills, mechanical mills, air classifiers, ball mill with classifier, surface modification lines and more.
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