DP® Air Classifier Mill ACM

Pulverisers & Classifier Mills

DP® Air Classifier Mill ACM

The DP® Air Classifier Mill is a high-speed, screenless hammer mill with an integrated air classifier. It combines impact grinding and dynamic classification in a compact unit for precise 8–40 micron particle reduction. The system ensures sharp top cut control, narrow distribution, and reliable performance—even for heat-sensitive, medium-hard materials.

Allowable Feed Size: 0 to 15 mm
Achievable Output Fineness: 8 Microns to 40 Microns
Throughput Capacity: 5 kg/hr to 3000 kg/hr

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Working Principle

The DP® Air Classifier Mill integrates continuous grinding and dynamic classification into a single compact unit. The feed material enters through the Feed Hopper (1), where a Screw Feeder (2) delivers it at a regulated rate into the Grinding Zone (3). Inside this zone, a high-speed Rotor Disc (4) fitted with Hammers (5) accelerates the material outward. The Serrated Liner (6), positioned along the chamber wall, enhances impact by deflecting the material back into the hammer path, resulting in efficient size reduction through repeated collisions.

As the particles are ground, a stream of air introduced through the Air Inlet (7) assists in carrying the material upward into the Classification Zone (8). Here, the air/material mixture passes through a Baffle Ring (9) and reaches the rotating Classifier Rotor, housed within the Classifier Shaft & Bearing Housing Assembly (10). Particles of the desired size pass through the classifier and exit with the air stream via the Fine Product & Air Outlet (11), while oversized particles are rejected and returned to the grinding zone for further reduction. This internal loop ensures consistent fine product quality with a sharp particle size cutoff.

The mixture of fine product and air is then conveyed through external piping to a cyclonic separator, where the product is separated and collected. Any remaining ultrafine dust is carried further to a pulse-jet dust collector, ensuring clean and dust-free air discharge. The system also include a conveying blower to maintain controlled airflow. Overall, the integrated design allows for precise particle size control, energy-efficient grinding, and dust-free operation in a compact and maintainable layout.

Features & Benefits

Integrated grinding and dynamic classification in one compact unit
High-speed rotor with impact hammers or pins
Stepless easy online particle size adjustment and control
Narrow particle size distribution
Suitable for fine and ultrafine particle size up to 8 microns
Serrated liner for enhanced grinding efficiency
Suitable for combined grinding and drying

Machine sizes

Options & Accessories

Construction Materials: Available in carbon steel, stainless steel (SS304, SS316, SS316L), or custom-engineered configurations to meet specific product or regulatory requirements.
Pressure Shock Resistance: Can be designed to withstand pressures up to PSR 11 Bar.
Cooling Technology: Optional integrated airflow cooling or water jacket cooling ensures safe handling of heat-sensitive materials, preserving product quality.
Hammer Options: Multiple hammer configurations are available (flat, serrated, pin type), in various wear-resistant materials, based on grinding characteristics.
Classifier Options: Available with dynamic classifier designs featuring variable speeds and material options (carbon steel, hardened steel, ceramics) for precise top-cut control and durability.
Safety Mechanisms: Can be equipped with vibration sensors, temperature sensors, and safety interlocks to ensure operational safety and equipment protection.
Combined Functionality: Option for combined drying and pulverising processes.