How an Air Classifier Mill Works

Introduction to Air Classifier Mills

Air Classifier Mills are advanced milling machines designed for grinding and classifying in one system. They are particularly effective in the production of fine and ultra-fine powders. The key component in these mills is the integrated air classifier, which is used to separate particles based on size and density.

Principle of Operation

The Grinding Process

  1. Material Feeding: Materials are fed into the milling chamber where a rotating disc with hammers reduces them to smaller sizes.
  2. Particle Reduction: The hammers accelerate particles to high speeds, causing them to collide with each other and the walls of the milling chamber, leading to size reduction.


  1. Air Circulation: The classifier wheel, located at the top of the mill, spins at high speed. It creates a vortex of air that draws the ground particles upward.
  2. Particle Separation: Particles are separated based on their size. The finer particles pass through the classifier and are collected as the final product, while the coarser particles fall back into the mill for further grinding.

Collection of Final Product

  1. Fine Powder Collection: The ultrafine particles are carried with the air stream to a collector where they are gathered.
  2. Coarse Particle Recirculation: Coarser particles, not meeting the desired size, are returned to the milling chamber for further grinding.

Key Components and Specifications

Milling Chamber

  • Material: Constructed with durable materials to withstand high-speed impacts.
  • Size and Specifications: Varies according to the model and intended use, with specific attention to chamber volume and hammer size.

Classifier Wheel

  • Speed Control: Adjustable to achieve desired particle size.
  • Material and Design: Typically made of hardened steel or other wear-resistant materials.

Drive System

  • Power: The power of air classifier mills varies, typically ranging from 5 to 150 kW, depending on the model and application.
  • Speed: The rotor speed is critical and is adjusted according to the material being processed.

Advantages and Limitations


  1. Efficiency: High energy efficiency, especially for ultrafine grinding.
  2. Versatility: Suitable for a wide range of materials and applications.
  3. Quality: Produces consistent and controllable particle sizes.

Limitations and Considerations

  1. Cost: The initial investment and maintenance costs can be significant.
  2. Size and Space Requirements: Larger models require more space and have higher power demands.


Air Classifier Mills represent a sophisticated technology for particle size reduction and classification. They are widely used in various industries for the production of fine and ultra-fine powders. While they offer many advantages in terms of efficiency and versatility, considerations around cost, size, and maintenance requirements are important.

For more detailed specifications and models, you can refer to the ultrafine classifier mill.

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