Used Air Classifiers
Air classifiers separate particles by size, density, or shape using controlled airflow rather than physical screens. These machines efficiently sort fine powders and granular materials that are too small or delicate for mechanical screening, delivering precise cut points in the micron range.
Federal Equipment Company stocks turbo screen classifiers, mechanical air classifiers, and centrifugal separators from Sweco and Hosokawa. Available units range from 18" to 10’ in diameter with throughput capacities from laboratory scale up to 10 TPH. Construction materials include stainless steel, aluminum, and carbon steel.
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Air classifiers use centrifugal force and drag to separate particles based on size, shape, and density. Material enters a classification chamber where an air stream carries lighter, finer particles upward while heavier, coarser particles fall downward or exit through a reject port. The separation cut point is controlled by adjusting rotor speed and airflow volume, enabling operators to achieve precise particle-size distributions without mechanical screens.
Turbo screen classifiers combine air classification with a rotating screen element. An internal blower creates high-velocity air movement while the screen provides an additional separation barrier, resulting in sharper cut points and higher throughput for materials that benefit from both screening and air classification. These units are common in applications where a consistent particle size distribution is critical.
Mechanical air classifiers use a spinning rotor, or whizzer blade, to create a centrifugal field that drives separation. Particles above the cut size are rejected to the coarse outlet, while particles below the cut size exit with the airflow to a cyclone collector. This design handles high throughput rates and works well with abrasive materials.
Federal Equipment Company stocks air classifiers from Sweco, Hosokawa, Donaldson, and other manufacturers. Available configurations include turbo screen models with 18" to 30" screens, mechanical classifiers with 12" to 24" chambers, and large-capacity whizzer separators up to 10’ diameter. Motor sizes range from fractional HP for lab units up to 200 HP for production-scale equipment. Many units include cyclone collectors and feeders as complete systems. Our team can inspect and test equipment before shipment.
Applications & Industries
- Particle size control in powder coating manufacturing
- Fines removal from plastic pellets and resin processing
- Pharmaceutical powder classification and dedusting
- Mineral processing and cement production
- Chemical catalyst preparation and recovery
- Food ingredient processing and flour classification
- Pigment and toner manufacturing
- Metal powder classification for additive manufacturing
- Recycling operations for material separation
Industries served include chemical, pharmaceutical, plastics, food and beverage, and mineral processing.
Specifications & Configurations
- Classification chamber diameter: 12" to 10’ (300 mm to 3 m)
- Cut size range: 1 to 50 microns (air classifiers), coarser for turbo screens
- Throughput capacity: 20 lb/hr up to 10+ TPH depending on material and cut size
- Airflow: 150 CFM to 14,000+ ACFM
- Motor power: 0.18 kW to 200 HP
- Materials of construction: Stainless steel (304/316), aluminum, carbon steel
- Wear protection options: Ceramic-lined rotors, polyurethane chamber linings, alumina oxide tips
- System components: Cyclone collectors, rotary airlock valves, volumetric feeders, dust collectors
Why Buy Used Air Classifiers
Used air classifiers offer significant cost advantages over new equipment, with typical savings of 40% to 60% depending on age and condition. Lead times for used equipment are measured in days rather than the weeks or months required for new classifier orders.
Air classifiers have fewer wear components than mechanical screeners, so properly maintained units retain their performance characteristics over an extended service life. Federal Equipment Company can provide inspection, testing, and refurbishment services to verify equipment condition and restore classifiers to production-ready status.
