Jet Mill
1. Product Overview
1.1 General Description
The jet mill achieves ultra-fine grinding by accelerating particles in a high-velocity gas stream so that they collide with one another; with no mechanical grinding parts, it is one of the mainstream machines for producing ultrafine powders (1-45μm). The high-speed gas (0.6-1.0MPa compressed air or superheated steam) is accelerated to 2-3 times the speed of sound through the nozzles, and particles entrained in the stream collide and fracture after being accelerated. The built-in classifier wheel provides real-time classification: qualified fines are carried out by the airflow for collection, while coarse particles return for further grinding. The jet mill is particularly suitable for ultra-fine grinding of hard, high-purity and low-melting-point materials, with no contamination and a low temperature rise.
1.2 Key Features
- Ultra-fine grinding with controllable particle size from 1-45μm
- No mechanical grinding parts — no contamination
- Collision grinding by air jets with a low temperature rise
- Built-in classifier wheel for real-time classification
- Suitable for hard and low-melting-point materials
- Fully enclosed, dust-free operation
- Inert-gas option for explosion protection
- High degree of automation
1.3 Document Scope
This specification covers the design principle, performance parameters, system classification, selection of key components, application fields, design standards and certifications, custom optional configurations, warranty terms, packaging and delivery, and the information required for an inquiry. It serves as a comprehensive reference for procurement, model selection and technical exchange.
2. Working Principle
2.1 Jet Mill Process Flow
Jet mill process flow: compressed air → accelerated to supersonic flow through the nozzles → material is accelerated → particles collide and fracture → classification by the built-in classifier wheel → qualified fines enter the collector → coarse particles return for further grinding. Compressed air is injected into the grinding chamber through 3-6 nozzles at specific angles, forming a high-speed swirling flow field. Particles are accelerated to several hundred m/s in the vortex and grind each other on impact. The built-in classifier wheel rotates at high speed (up to over 10000rpm) and classifies particles under the combined action of centrifugal force and gas drag. Qualified fines pass through the classifier into the cyclone separator and bag collector.
3. System Classification
| | | | |
|---|
| Small | MQW-10, MQW-30 | Air consumption 1-3m³/min | Laboratory / lab trials | Bench-top design |
| Medium | MQW-100, MQW-300 | Air consumption 6-15m³/min | Pilot / small-scale production | With classifier wheel |
| Large | MQW-600, MQW-1000 | Air consumption 20-40m³/min | Large-scale production | Multi-nozzle design |
4. Technical Parameters
4.1 Main Technical Parameters of the Jet Mill
| MQW-10 | MQW-30 | MQW-100 | MQW-300 | MQW-600 | MQW-1000 |
|---|
| Capacity(kg/h) | 0.5-5 | 2-20 | 10-80 | 30-200 | 80-500 | 150-800 |
| Grinding fineness(d50μm) | 1-45 | 1-45 | 1-45 | 1-45 | 1-45 | 1-45 |
| Air consumption(m³/min) | 1 | 3 | 6 | 15 | 25 | 40 |
| Working pressure(MPa) | 0.6-1.0 | 0.6-1.0 | 0.6-1.0 | 0.6-1.0 | 0.6-1.0 | 0.6-1.0 |
| Classifier wheel speed(rpm) | 0-18000 | 0-12000 | 0-8000 | 0-6000 | 0-5000 | 0-4000 |
| Classifier motor(kW) | 0.75 | 1.5 | 3 | 5.5 | 7.5 | 11 |
| Number of nozzles | 3 | 4 | 4 | 6 | 8 | 10 |
4.2 Dimensions and Weight
| | | | | |
|---|
| MQW-10 | 600 | 500 | 1200 | 200 | 0.3 |
| MQW-30 | 800 | 600 | 1400 | 400 | 0.5 |
| MQW-100 | 1000 | 800 | 1600 | 800 | 0.8 |
| MQW-300 | 1200 | 1000 | 2000 | 1500 | 1.2 |
| MQW-600 | 1500 | 1200 | 2400 | 2500 | 1.8 |
| MQW-1000 | 1800 | 1500 | 2800 | 4000 | 2.7 |
5. Applications
| | | |
|---|
| Chemical | Pigments / fillers / catalysts | Ultrafine, contamination-free | Titanium dioxide / alumina |
| Pharmaceutical | Drug substances / APIs | Low temperature, contamination-free | Micronized ibuprofen |
| New materials | Battery materials / ceramic powders | High purity | Ternary cathode materials |
| Agrochemical | Wettable powders / water-dispersible granules | High fineness, good suspension | Micronized pesticides |
| Minerals | Quartz / feldspar / barite | High hardness | Ultrafine quartz powder |
| Food | Dietary fiber / protein powders | Food-grade | Soy protein powder |
6. Core Component Selection
| | | |
|---|
| Nozzles | Accelerate the gas to supersonic speed | Carbide / ceramics | Angle and number affect grinding performance |
| Grinding chamber | Where particles collide and fracture | SS304 / ceramic lining | Flow-path design affects collision efficiency |
| Classifier wheel | Real-time particle classification | SS304 / ceramics | Rotation speed determines the cut size |
| Cyclone collector | Gas-solid separation | SS304 | Separation efficiency ≥95% |
| Bag filter | Fine collection | Anti-static filter bags | Filtration precision 0.5μm |
| Feeder | Metered feeding | Screw / vibrating feeder | Adjustable feed rate |
| Control system | Coordinated operation | PLC+HMI | With closed-loop control of pressure and speed |
| Air compressor | Supplies compressed air | Screw compressor | Requires dryer and filters |
7. Design Standards and Certifications
| | | |
|---|
| GB/T standards | Design and manufacture | Fully compliant | Type test report |
| GMP (cGMP) | Design, manufacture, documentation | Fully compliant | GMP compliance certificate |
| ISO 9001:2015 | Quality management system | Certified | ISO 9001 certificate |
| CE | Machinery safety / EMC | Optional | CE Declaration of Conformity |
| FDA | Food-grade / pharmaceutical-grade | Optional | FDA compliance documentation |
8. Custom Optional Configurations
| | | | |
|---|
| 1 | Gas type | Compressed air / superheated steam / nitrogen | Compressed air | Nitrogen +2 weeks |
| 2 | Lining material | Stainless steel / ceramic / polyurethane | Stainless steel | Ceramic +3-4 weeks |
| 3 | Classifier wheel | Single-stage / two-stage | Single-stage | Two-stage +2 weeks |
| 4 | Collection method | Cyclone + bag / bag only | Cyclone + bag | Bag only +1 week |
| 5 | Explosion protection | Standard / nitrogen blanket | Standard | Nitrogen blanket +2 weeks |
| 6 | Automation | Manual / semi-automatic / fully automatic | Semi-automatic | Fully automatic +3 weeks |
9. Material Property Requirements
| | |
|---|
| Working temperature | -40~250℃ | Depends on seals and materials |
| Corrosivity | Mild to moderate | Strong corrosion requires 316L or lining |
| Ex-proof requirement | Selected per site area | Zone1 / Zone2 ratings |
10. Warranty Terms
| | | |
|---|
| Main equipment warranty | 12 months | All components included | 12 months from acceptance after commissioning |
| Extended warranty (optional) | 24 months | Same as standard warranty | Must be purchased at order placement |
| Wear parts warranty | 6 months | Seals, bearings, etc. | Normal wear excluded |
11. Packaging and Delivery
| |
|---|
| Standard delivery time | 6-10 weeks after order confirmation |
| Delivery with custom options | 10-16 weeks |
| Incoterms | FOB Shanghai / CIF / DAP |
| Packaging | Export wooden case |
| Shipping | Container or break-bulk vessel |
12. Information Required for Inquiry
| | |
|---|
| 1 | Material name and properties | Hardness / melting point / explosibility |
| 2 | Feed particle size | μm |
| 3 | Target size d50 | μm |
| 4 | Capacity required | kg/h |
| 5 | Purity requirement | Metal-contamination limits or not |
| 6 | Temperature sensitivity | Yes / No |
| 7 | Ex-proof requirement | Standard / nitrogen blanket |
| 8 | Compressed air source | Available / not available / compressor required |