Overview

Air Classifier

The realization of powdered material functionality often requires the particle size to meet certain conditions. For example, Zirconia powder for ceramic glaze requires an average particle diameter of 1-2 microns. Metal powder for 3d printing requires good sphericity, fine particle size and narrow particle size distribution. It is necessary to classify the powder particles to meet for specific applications.

Classification is the operation of separating the powder into two groups of large and small particles. In an air classifier, the powder is subjected to air resistance and centrifugal force, thus accomplishing the operation of classifying ultra-fine powders.

D97<2μm

Cut Point Range

2t/h

Throughput

90%

Efficiency

Air classifier

Principle

How does an Air Classifier Work?

Air classifier principle

Schematic diagram of an air classifier

01

Material Feeding

The material enters through the lower feed inlet and is carried upward by a high-speed rising airflow generated by the fan, moving into the classifying zone.

02

Primary Separation

Inside the classifying zone, a dynamic classifying wheel creates strong centrifugal force. Fine particles meeting the size requirement pass through the gaps between the classifier wheel and are collected in a cyclone separator or dust collector.

03

Secondary Rinsing

As the dropped particles fall, they reach the secondary air inlet. There, the powerful washing action of the secondary air separates the remaining fine particles from the coarse ones.

04

Coarse Material Rejection

The fully separated and rejected coarse material continues down under gravity and is safely discharged at the bottom of the classifier.

Features

Micron-Level Precision

Achieves ultra-fine classification at the micron level, making it highly suitable for diverse particle morphologies.

Flexible Cut-Point Range

Offers a wide particle size cut-point adjustment range, efficiently handling sizes anywhere from 1 to 100 microns.

Dynamic Control

Allows for precise, real-time control of the cut-point during operation simply by adjusting the rotor speed and airflow rate.

High Efficiency

Exceptional performance with a classification efficiency reaching up to 90%.

Multi-Fraction Capability

Supports multi-stage setups where multiple classifiers can be used in series to separate several particle size ranges.

Automated Operation

Equipped with PLC control for real-time monitoring of system operation, ensuring high stability and minimal manual intervention.

Specification

ATP Series -- Data Sheet

ATP Series model specifications
Model Rated power (kW) Cut point d97 (micron) Efficiency (%) Feed Rate (kg/h)
ATP01 7 - 11 2 - 45 60 - 90 10 - 100
ATP02 15 - 19 2 - 45 60 - 90 20 - 200
ATP03 21 - 28 2 - 45 60 - 90 50 - 500
ATP04 23 - 30 3 - 45 60 - 90 100 - 1500
ATP05 52 - 60 3 - 45 60 - 90 200 - 2000

* Capacity values are indicative and depend on material properties, target fineness range.

General Parameters

  • Classification Cut Point (D97) 2 - 45 μm
  • Recovery Rate up to 99%
  • Contact Material Steel / Ceramic
  • Rotor Speed 1,000 - 12,000 rpm
  • Air Volume Flow 300 - 6,000 m³/h

Download Full Technical Datasheet

Get the complete specifications, and performance data in one document. PDF · ~2MB

Download

Applications

Precise Classification for Ultrafine Powders

Battery Cathode
Battery

Cathode Materials

Precision classification of LFP, NCM, and LCO to achieve narrow particle size distribution PSD for high energy density.

Mineral
mineral

Ultra-Fine Minerals

High-efficiency separation of ultra-fine industrial minerals and abrasives, ensuring sharp top-size cuts down to the sub-micron range.

Fine Chemical application
Chemical

Dyes & Catalysts

Primarily for fine classification, narrow particle size control, and removal of coarse particles or fines.

3D Printing
3D Printing

Metal powder

Tailoring the particle size distribution of spherical metal powders for high-quality 3D printing.

FAQ

Answers to the most common technical and commercial questions from procurement managers and process engineers evaluating air classifiers.

Still have questions?

Our engineers are available for a 30-minute technical consultation.

Book a Consultation
What particle size can an air classifier achieve?
Typical classification range: 2-100 µm, adjustable by rotor speed, airflow, and classifier wheel design.
Can air classifiers handle abrasive materials?
Yes, air classifiers can be built with a wear-resistant construction to handle abrasive powders.
How does an air classifier compare to a cyclone?
A cyclone is a simple static equipment that removes particles from gas; it has limited classification ability and a broad cut point. Cyclones are often used as pre‑collectors before a classifier, or to recover fine product after classification.
Can the classifier be used in a closed‑loop system?

Yes. For example, in a ball mill + air classifier closed system.

  • The mill discharges to the classifier.
  • Fines are collected as product; the coarse fraction returns to the mill for further grinding.