Air Classifier
Air Classifier
Vertical vortex classifier with stepless cut-point adjustment. D97 cut range 5–200 µm. High classification efficiency. Operates standalone or integrated with jet mills to form a closed-loop system for precise powder particle size control and coarse-fine separation.
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.
No Grinding, No Contamination
Pure air classification — no grinding parts, no metal contamination introduced. Suitable for high-purity powder classification.
Low Energy Consumption
Used for classification only, not grinding. Significantly lower energy consumption than combined grinding + classification, with good economy.
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: 0816-2680206
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. When both operate in closed-loop, particle size control is stronger and product yield is higher.
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.