Overview

Air Classifier Mill

An air classifier mill combines a mechanical impact mill with an integrated dynamic air classifier. It is an air swept mechanical impact mill designed to grind materials down to 10 microns.

Air classifier mills offer precise particle size control, narrow particle size distribution, and high production efficiency.

D90<10μm

Fineness Range

1t/h

Max Throughput

1-5Mohs

Marterial Hardness

Air classifier mill

Principle

How does an air classifier mill work?

Air Classifier Mill working principle

Air Classifier mill working principle

  1. 1. Mill rotor
  2. 2. Liner
  3. 3. Classifying wheel
  4. 4. Guide plate
  5. 5. Rotor
  6. 6. Housing
01

Material Feeding

The raw feed material is continuously introduced into the system through a pneumatic feed duct, drawing it directly into the grinding chamber.

02

Impact Size Reduction

Once inside the grinding zone, the material encounters the grinding disc rotating at extremely high tip speeds ranging from 70 to 120 m/s. Size reduction is achieved through a combination of impact, shear, and inter-particle attrition.

03

Dynamic Classification

The final product particle size is precisely adjusted by changing the speed of the classifier wheel. Higher speeds generate higher centrifugal force, resulting in a finer cut point.

04

Product Collection & Discharge

The qualified fine product exits the top of the mill and enters a downstream cyclone separator, where the bulk of the finished powder is separated from the air vortex and discharged.

Features

Engineered for Your Particle Size.

Two-in-One Integration

Integrates mechanical grinding and dynamic classification in a single unit, eliminating the need for separate screening equipment.

Sharp & Adjustable Precision of Cut

High classification accuracy; the classifier rotor speed is independently controlled by a VFD, allowing easy online adjustment of product fineness.

High purity & Wear protection

For medium-hard or metal-sensitive materials, key components can be lined with alloy steel, alumina, zirconia, or tungsten carbide to ensure no metal contact and high product purity.

Specification

ACM Series — Data Sheet

JM-SJ Spiral Jet Mill model specifications
Model Rated power (kW) Grinding speed (rpm) Capacity (kg/h) Air flow rate (m³/h)
ACM150 7.8 12,000 0.5 - 5 5
ACM300 17 7,000 5 - 80 10
ACM350 30 6,800 50 - 500 20
ACM450 48 5,000 80 - 1,000 40

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

General Parameters

  • Achievable D90 < 10 - 120 μm
  • Feed Particle Size (max) ≤ 10 mm
  • Contact Material Stainless steel / Ceramic
  • Grinding speeds 60 - 130 m/s
  • Hardness of material 1 - 5 Mohs

Download Full Technical Datasheet

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Applications

Applicable to demanding production environments.

Food & Agriculture
Food & Agricultural

Spices & Grains

ACM's self-cooling airflow makes it ideal for fatty, or fibrous food materials, preserving flavor and preventing clogging.

Chemicals
Chemicals

Agrochemicals & Polymer

ACMs are widely used in the fine chemical sector for processing heat-sensitive, sticky, or abrasive materials.

Battery Materials
Battery

Cathode & Anode

Ceramic-lined options (alumina, zirconia, tungsten carbide) ensure zero metal contamination and tight particle size distribution.

Non-Metallic-Mineral
Mineral

Non-Metallic Minerals

Utilizing its dynamic classifier wheel, the ACM processes industrial minerals into uniform fine powders in a single pass.

FAQ

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

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What particle size can an ACM achieve?

An Air Classifier Mill (ACM) can typically achieve a product fineness in the range of D90 = 10 to 100 µm, depending on the material characteristics and system configuration.

For ultra-fine powders below a few microns, a jet mill or other ultra-fine grinding equipment may be more suitable.

How do I adjust the particle fineness of the ACM?

Adjust the particle size mainly through the following methods.

  • Increase Wheel Speed – Higher centrifugal force → Only finer particles pass.
  • Reduce Airflow – Lower inward suction → Coarse particles stay behind → Product gets finer.
What equipment is usually included in an ACM system?
A complete ACM system usually consists of a feeding system, ACM main mill, cyclone separator, bag filter, induced draft blower, rotary valve etc.
What materials are ACM not suitable for?
  • High-Hardness & Highly Abrasive Materials – Severe wear on hammers and metal pollution.
  • High-Fat, Sticky, or Oily Materials – Blinds the classifier wheel slots.
  • High-Toughness & Elastic Materials – Cannot be shattered by impact.
Is the ACM suitable for pharmaceutical production?

It is not recommended for pharmaceutical application based on our experience. The reasons are as follows:

  • Complex structure with dead zones – It is difficult to clean.
  • Mechanical heat generation – This can cause thermal degradation, melting, or loss of potency.