Air Classifying Mill (ACM) from Botek machinery is a versatile grinding system that integrates a high-speed impact mill with a dynamic air classifier. It works in a closed-loop process: material is fed into the grinding chamber where rotating hammers pulverize it. The fine particles are then carried by the airflow to the integrated classifier wheel. The classifier precisely separates particles by size: fine particles that meet the target size pass through, while coarse particles are recirculated back for further grinding. This ensures highly efficient and controlled fine powder production.
Advantages
How Our Air Classifying Mill Delivers Superior Results
Unlike conventional grinders, our ACM employs a two-stage, closed-loop process for precise and efficient grinding:
Impact Grinding: Feed material is accelerated by a high-speed, multi-tip rotor, creating intense particle-on-particle and particle-on-liner impact in the grinding zone.
Dynamic Air Classification: The ground material is carried by process air to a precision, variable-speed classifier wheel. Fine particles meeting the target size pass through; coarse particles are recirculated back to the grinding zone.
This integrated system is the key to achieving sharp particle size cuts, maximum yield, and energy efficiency, while eliminating over-grinding.
Key Advantages of Our Design:
- Precision Control & Cool Operation: Adjust fineness on-the-fly (D97 from 5µm to 150µm). High air throughput ensures low-temperature processing, ideal for heat-sensitive materials like resins, APIs, foods, and chemicals.
- Superior Efficiency & Durability: Our patented rotor and liner design creates intense turbulence for superior grinding efficiency and throughput. Robust construction offers options for stainless steel, wear-resistant alloys, or ceramic liners.
- Easy Maintenance & Sanitary Design: A hinged door and quick-release parts allow for rapid inspection, cleaning, and component changeover. GMP-compliant designs with polished surfaces ensure contamination-free operation for pharmaceutical and food-grade applications.
- Scalable Solutions: From pilot-scale R&D to high-capacity production lines exceeding 5,000 kg/h, we provide scalable solutions to match your needs.
Data Sheet
| Model | Capacity (kg/h) | Output Size(mesh) | Feeding Size(mm) | Power(kw) | Main speed(r/min) | Overall size(mm) |
| BACM-15 | 20-100 | 80-1000 | <10 | 13.37 | ~5800 | 4500 X 1250 X 2700 |
| BACM-20 | 50-200 | 80-1000 | <10 | 18.37 | ~4200 | 6000 X 1250 X 2900 |
| BACM-30 | 100-400 | 80-1000 | <10 | 42.5 | ~3800 | 7100 X 1300 X 3650 |
| BACM-60 | 200-800 | 80-1000 | <12 | 77.5 | ~3200 | 8000 X 2300 X 4500 |
| BACM-80 | 300-1000 | 80-1000 | <12 | 96 | ~2800 | 8500 X 2500 X 4600 |
Configuration and application of the Air Classifying Mill
Air Classifying Mill handling chemical powder
Food Grade Air Classifying Mill
Air Classifying Mill Complete Turnkey
Air Classifying Mil FAQS
Our Air Classifying Mills are engineered for fine to ultra-fine grinding. Typically, they can achieve a particle size range (D97) from 10 microns (µm) up to 150 microns, depending on the material properties and machine configuration. For certain soft and brittle materials, achieving a D97 below 10 microns is possible. We recommend contacting our engineers for a free particle size analysis based on your sample.
Absolutely. We are more than just an ACM manufacturer; we are a solutions provider for complete powder processing systems. We design, manufacture, and integrate all key auxiliary equipment to create a seamless, high-efficiency production line for you.
Our in-house capabilities include:
Feeding Systems: Volumetric or loss-in-weight feeders for consistent material input.
Pre-Sizing & Скрининг: Vibratory screens and crushers to ensure optimal feed size for the ACM.
Post-Processing & Classification: Cyclone separators, high-efficiency bag filter dust collectors, and precision screening machines to ensure final product purity.
Product Conveying & Handling: Screw conveyors, pneumatic conveying systems, and storage silos.
Automated Packaging: Valve bag packers, big bag fillers, and sealing systems.
By offering integrated turnkey solutions, we ensure perfect compatibility between all components, provide a single point of contact for support, and deliver a production line optimized for your specific material, capacity, and final product requirements. This saves you time, reduces interface risks, and guarantees overall system performance.
The key is the integrated dynamic air classifier. Unlike simple hammer mills, our ACM features a variable-speed classifier wheel that acts as a precise sizing gate. It allows only particles smaller than the cut point to exit. Oversized particles are continuously returned for grinding. This internal classification loop eliminates over-grinding (reducing energy waste and heat generation) and guarantees a sharp, consistent particle size distribution (PSD) in the final product.
Absolutely. We prioritize sanitary design and operator-friendly maintenance. Key features include:
Quick-Release Clamps: Allow fast disassembly of the grinding chamber and classifier without special tools.
Full-Bore Doors: Provide full access for thorough cleaning and inspection.
Smooth, Crevice-Free Surfaces: Critical for pharmaceutical and food-grade applications to prevent cross-contamination.
The required capacity and power depend on three main factors:
Material Properties: Hardness (Mohs scale), density, moisture content, and initial feed size.
Target Fineness: The finer the desired particle size (D97), the lower the throughput capacity.
Feed System: Consistent and controlled feeding is crucial for optimal performance.
We offer models with motor power from 15 kW to 250 kW and capacities ranging from 50 kg/h to 10,000 kg/h. Please send us your material sample for a free lab test and precise system recommendation.
Yes, we provide extensive customization options to meet your exact process requirements:
Material of Construction: Standard carbon steel, 304/316 stainless steel, or ceramic-coated contact parts.
Special Designs: Explosion-proof (ATEX) options, inert gas (nitrogen) purging systems for flammable materials.
System Integration: Custom feeding systems, cyclone collectors, dust filters (bag filters), and complete closed-circuit packaging lines.
Our standard delivery includes the complete Air Classifying Mill unit, starter, and essential documentation. More importantly, we provide comprehensive after-sales support:
Detailed Installation & Operation Manuals (videos available).
Remote or On-site Commissioning and Training for your operators.
24/7 Technical Support via email and phone.
Wear Parts Inventory: We maintain a ready stock of hammers, liners, and classifier blades for fast delivery worldwide.
