Air Classifier
The Air Classifier is a critical component in modern powder production lines, providing precise particle size separation using controlled air flow dynamics. Installed after grinding mills, the air classifier separates ground powder into coarse and fine fractions, returning oversized particles for regrinding while directing qualified powder to collection. This closed-circuit approach improves grinding efficiency, reduces energy consumption, and ensures consistent product quality. LIMING's air classifiers feature adjustable cut points, high classification precision, and robust construction for continuous operation in demanding mineral processing environments.
Working Principle
Powder is fed into the classifier where it encounters a controlled air stream. A rotating impeller or cage wheel creates a centrifugal field that interacts with the air drag force. Particles larger than the cut point (where centrifugal force exceeds drag force) are thrown outward and returned for regrinding. Particles smaller than the cut point are carried by the air stream through the impeller to the fine fraction outlet. The cut point is adjustable by changing impeller speed and air flow rate.
The grinding process is precisely controlled by the integrated classification system, which separates qualified fine powder from coarse particles. Coarse particles fall back to the grinding chamber for regrinding, while fine powder is conveyed by airflow to the cyclone collector and then to the finished product silo. This closed-circuit design ensures consistent product quality and high grinding efficiency.
Key Features & Advantages
Precise Cut Point
Adjustable impeller speed and air flow allow precise control of the separation size, typically adjustable from 150 to 3000 mesh.
High Classification Efficiency
Optimized impeller design achieves classification efficiency of 80-90%, minimizing misplaced particles.
Closed-Circuit Integration
Seamlessly integrates with grinding mills for continuous closed-circuit operation, improving overall grinding efficiency.
Low Energy Consumption
Efficient air flow design minimizes blower power consumption while maintaining classification precision.
Applications & Industry Use
This equipment is widely used across multiple industries for various powder processing applications:
- Grinding mill product classification
- Multi-grade powder production
- Coarse powder removal
- Ultrafine powder separation
- Quality control in powder production
Processable Materials
The versatile design of this equipment allows it to process a wide range of non-metallic minerals and industrial materials. Below are some of the most commonly processed materials. For detailed grinding solutions for each material, please visit our materials page.
Technical Specifications
The following table provides detailed technical parameters for each model in this product series. These specifications are based on standard configurations and may vary depending on material properties and specific application requirements. Contact our engineering team for customized configurations.
| Model | AC-S | AC-M | AC-L |
|---|---|---|---|
| Classification Range (mesh) | 150-3000 | 150-3000 | 150-3000 |
| Feed Capacity (t/h) | 0.5-5 | 2-20 | 5-50 |
| Power (kW) | 3-5.5 | 7.5-15 | 15-30 |
Performance & Efficiency
The Air Classifier is designed for maximum grinding efficiency and energy savings. The optimized grinding chamber geometry, combined with high-precision classification, ensures that energy is used effectively for particle size reduction rather than wasted on over-grinding or heat generation. Compared to conventional milling systems, our equipment typically achieves 20-30% lower power consumption per ton of finished powder.
Key performance metrics include stable fineness control with deviation less than 5%, low noise levels below 75 dB at 1 meter distance, and dust emissions below 20 mg/m3 when equipped with our pulse bag filter system. These performance characteristics make our equipment suitable for even the most demanding industrial environments and stringent environmental regulations.
Installation & Commissioning
Proper installation is critical for optimal equipment performance and longevity. Our experienced engineers provide on-site installation and commissioning services, including equipment positioning, alignment, electrical connection, piping installation, and system integration. The typical installation timeline ranges from 15 to 45 days depending on equipment model and production line complexity.
During commissioning, we conduct comprehensive performance tests including no-load test, load test, and production trial runs. We verify all performance parameters meet design specifications, calibrate control systems, train your operators on proper operation and maintenance procedures, and deliver a complete commissioning report with all test data.
Frequently Asked Questions
The cut point is primarily controlled by the impeller rotation speed: higher speed produces finer cut (smaller particles pass through). Air flow rate also affects the cut point. Both are adjustable during operation.
Yes. By changing the impeller speed, you can produce different grades from the same feed. For simultaneous multi-grade production, a multi-head classifier (like in the LUM mill) is recommended.