Air Classifier
Air Classifier
An air classifier separates powder in an airflow and classifier wheel. Use it for upper-size control, coarse-particle removal, or integration with milling. Confirm cut point and recovery using your feed material.
Separate fine and coarse powder to your specification
Choose standalone classification when the feed already contains useful fine material. Where size reduction is also required, evaluate a mill and classifier together. The feed distribution and desired recovery are as important as the final cut point.
- Provide the complete feed distribution and required fine-product specification.
- State the required recovery and how the coarse fraction will be used or returned.
- Review dispersion, moisture, agglomeration, and contact-material requirements.
Working Principle
Process Flow
Uniform Suspension
Centrifugal Force Field
Classifier Wheel
Collection
Key Features
Precise Cut-Point Control
Stepless classifier speed adjustment. D97 cut-point accurately set within 5–200 µm range with high batch-to-batch consistency.
High Classification Efficiency
Advanced blade design and airflow organization. Sharp coarse-fine separation with narrow particle size distribution in product.
Standalone or Integrated Operation
Can classify incoming powder independently, or integrate with a jet mill to form a closed-loop grinding-classification system.
Classification Without Intentional Grinding
Air classification separates particles rather than intentionally grinding them. Contact-surface wear and material carryover still require review for high-purity applications.
System-Level Utility Review
Assess the fan, feeding, collection, and any connected mill together when comparing utility requirements and operating cost.
Wide Capacity Range
DWF series covers 5–8,000 kg/h. Suitable from laboratory scale to large industrial production.
Applications by Use Case
| Use Case | Typical Materials |
|---|---|
| Ultrafine Powder Size Control | Calcium carbonate, kaolin, talc, barium sulfate |
| Battery Material Classification | Cathode materials, anode graphite, solid-state electrolytes |
| Pharmaceutical Particle Size Control | API final particle size control, coarse particle removal |
| Fine Chemicals | Catalysts, specialty coating pigments & fillers, flame retardants |
| Ceramic Powders | Alumina, zirconia, silicon carbide classification and coarse removal |
Model Specifications
The figures below are reference values for typical materials. Actual capacity varies with material properties, feed particle size, and target cut-point.
| Model | Ref. Capacity | Cut-Point D97 | Feed Size |
|---|---|---|---|
| DWF-50A | 5–50 kg/h | 5–200 µm | ≤1 mm |
| DWF-100A | 20–150 kg/h | 5–200 µm | ≤1 mm |
| DWF-200A | 80–500 kg/h | 5–200 µm | ≤1 mm |
| DWF-350A | 200–1500 kg/h | 5–200 µm | ≤1 mm |
| DWF-500A | 500–3000 kg/h | 5–200 µm | ≤1 mm |
| DWF-700A | 3000–8000 kg/h | 5–200 µm | ≤1 mm |
Request a Classification Solution
Provide the feed particle size distribution, target cut-point, and capacity. We will recommend the right model and arrange a classification trial.
- Feed particle size distribution (D50/D90/D97)
- Target cut-point (fines D97 upper limit)
- Hourly capacity and product yield requirement
- Whether closed-loop integration with a jet mill is needed
Contact Us
Submit your classification requirements. We will recommend a model and arrange a trial to confirm classification performance.
Submit Classification Enquiry Book a Classification TrialPhone: +86-816-2680206
Frequently Asked Questions
Should I buy a standalone classifier or a combined grinding + classification system?
If the incoming feed particle size is already close to target but you need precise control of the upper particle size limit, a standalone classifier is often sufficient. If you need to grind from coarser raw material to ultrafine powder, a grinding + classification combination is typically needed. For a combined circuit, verify the final distribution and recovery through a representative trial.
What factors affect classification accuracy?
Key factors: classifier wheel speed (determines cut-point), system airflow (affects fine powder throughput), feed concentration (too high reduces accuracy), and material properties (density, morphology, flowability). Proper parameter setting results in narrower particle size distribution and more accurate D97.
How fine a powder can the air classifier separate?
The cut-point is typically adjustable in the range of 1–200 µm. The lower limit depends on material properties (density, tendency to agglomerate) and model. For D97 below 5 µm, we recommend confirming feasibility through a sample trial first.
Can capacity be determined by model alone?
No. Actual capacity is significantly affected by feed particle size distribution, target cut-point, product yield requirement, and material properties. Capacity should be confirmed through a sample trial or engineer evaluation to avoid selection errors.
What should a classification trial compare?
Compare the feed, fine product, and coarse fraction. Record particle-size distributions, recovered mass, and operating conditions together, so the result shows both product quality and recovery.
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