Inert Gas Jet Milling System
Inert Gas Jet Milling System
Replaces compressed air with nitrogen or argon in a fully enclosed closed-loop system. Oxygen monitored and controlled to below 100 ppm. Designed for safe ultrafine grinding of battery materials, active metal powders, and flammable or oxidation-sensitive chemical powders.
Working Principle
Process Flow
N₂ / Ar
Recirculation Compression
Inert Atmosphere
Fully Sealed
Recovery & Recycle
Key Features
Precise Oxygen Control
In-line oxygen analyzer with real-time monitoring and interlock control. Maintains inert atmosphere throughout the process, eliminating ignition and explosion risk.
Fully Sealed Inert Atmosphere
Grinding, classification, and collection are all fully enclosed. Material is completely isolated from air, preventing oxidation and degradation.
Closed-Loop Gas Recycling
Tail gas purification and recirculation. Reduces inert gas consumption by 60–80% compared to open-circuit systems.
Explosion-Proof Electrical Configuration
Motors, control panels, and sensors are all explosion-proof rated, meeting electrical safety standards for hazardous area classification.
High-Purity Processing
Complete exclusion of airborne moisture and impurities. Suitable for high-purity material requirements.
Modular Integration
Can be integrated with fluidized bed jet mills or complete production lines. Flexible system configuration to meet varying capacity needs.
Applications by Material Type
| Material Type | Typical Materials |
|---|---|
| Oxidation-Sensitive Materials | Battery cathodes (NCM, LFP), anode graphite, solid-state electrolytes |
| Reactive Metal Powders | Aluminum, titanium, magnesium, iron, and alloy powders |
| Flammable Chemical Raw Materials | Organic dye intermediates, agrochemicals, reactive fine chemical powders |
| Pharmaceutical Active Materials | APIs sensitive to oxidation or moisture |
| New Energy Materials | Solid-state electrolytes, perovskite precursors, hydrogen storage materials |
Model Specifications
The figures below are reference values for typical materials. Actual capacity varies with material density, hardness, and target particle size.
| Model | Ref. Capacity | Product Size D97 | Feed Size |
|---|---|---|---|
| DWB-2A | 0.5–10 kg/h | ≥2.5 µm | ≤10 mm |
| DWB-5A | 5–30 kg/h | ≥2.5 µm | ≤10 mm |
| DWB-10A | 15–80 kg/h | ≥2.5 µm | ≤10 mm |
| DWB-20A | 40–200 kg/h | ≥2.5 µm | ≤10 mm |
Request a Safety Solution
Inert gas protection systems involve material safety risk assessment, gas selection, mill configuration, and safety interlock design. Early and thorough communication is recommended to ensure the solution meets both safety and process requirements.
- Material name, CAS number, and Safety Data Sheet (SDS)
- Target particle size and hourly capacity
- Any existing explosion-proof or safety classification requirements
- On-site gas supply conditions (nitrogen supply method)
Contact Us
Provide material information and safety requirements. Our engineer will develop a targeted safe grinding solution.
Submit Safety Enquiry Book an Inert Gas TrialPhone: 0816-2680206
Frequently Asked Questions
When is inert gas protection mandatory?
Consider inert gas protection when the material falls into any of the following categories: ① the powder presents a dust explosion risk (e.g. metal powders, organic powders); ② the material oxidizes or degrades on contact with air (e.g. graphite anode, reactive metals); ③ the product specification sets an explicit oxygen content limit. Consult our engineer or provide the Safety Data Sheet (SDS) for evaluation.
Should nitrogen or argon be used, and what is the difference?
Nitrogen is used for the vast majority of materials and is significantly less expensive than argon. If the material reacts chemically with nitrogen (e.g. certain nitride-sensitive materials), argon is used instead. Provide the material chemistry when enquiring and our engineer will advise accordingly.
Is gas consumption high during operation?
The system uses a closed-loop recirculation design — purified gas is recycled, making actual consumption far lower than open-circuit configurations. Main consumption comes from start-up purge cycles and minor leakage make-up during material loading/unloading. Consumption is low during steady-state operation.
What oxygen level can the system maintain?
With proper system sealing, oxygen is typically controlled below 100–500 ppm. Systems with special requirements can be further optimized. The exact level depends on system design, sealing method, and operating conditions.
Can an existing jet mill be retrofitted with inert gas protection?
Retrofitting is possible in some cases, but requires evaluation of the existing equipment's sealing integrity, gas piping design, and whether the safety interlocks meet requirements. Please provide details of the existing equipment for an engineering feasibility assessment.