1. Industry Pain Points and the Need for a Nitrogen Closed-Loop Circulation System
In ultrafine grinding of lithium battery materials (e.g., lithium iron phosphate, lithium cobalt oxide), pharmaceuticals, and metal powders, materials are often flammable, explosive, or moisture-absorbing. Using air in traditional jet mills can cause combustion, explosion, or oxidation. For example, exposing lithium battery metal oxides to oxygen may trigger violent exothermic reactions. The pharmaceutical APIs may degrade due to oxidation. So explosion-proof air jet mills with Nitrogen Closed-Loop Circulation System are crucial to the industry.
The nitrogen closed-loop circulation system lowers oxygen content to O2 ≤ 10 ppm, eliminating explosion risks, preventing oxidation, moisture absorption, and material agglomeration.
2. Core Technology of the Nitrogen Closed-Loop System and Epic Powder’s Innovative Solution
Qingdao Epic Powder Machinery Co., Ltd. offers the following core technology modules based on its MQW closed-circuit nitrogen-protected air jet mill:
Inert Gas Circulation and Oxygen Content Control
Nitrogen replacement and dynamic nitrogen supplementation: Before starting, air is replaced with nitrogen. A real-time oxygen monitor (accuracy: 0.1 ppm) links to the PLC to automatically replenish nitrogen, maintaining safety thresholds.
Closed-loop design: Crushed nitrogen is purified by a cyclone separator, bag filter, and condenser, then returned to the system for recycling. Inert gas loss is under 5%, lowering operating costs.
Explosion-Proof and Safety Protection Design
Fully ceramic protection: The crushing chamber, nozzle, and pipeline are lined with zirconium oxide ceramic to prevent metal friction sparks and material contamination.
Pressure relief and anti-static: Bursting discs (burst pressure 0.01 MPa) and static electricity export devices ensure safety under extreme conditions.
Intelligent Control and Process Optimization
One-button start/stop and parameter traceability: Real-time monitoring and historical storage of parameters like oxygen content, pressure, and temperature via the PLC touch screen, meeting GMP and FDA standards.
Improved classification accuracy: A horizontal turbine classifying wheel achieves particle size control (D90 < 3 μm), ideal for ultrafine grinding of high-value materials.
3. Industry Application Cases of Epic Powder’s Nitrogen Closed-Loop Circulation System
Lithium Battery Positive Electrode Material Crushing
A Hunan customer uses the MQW40 air jet mill for lithium iron phosphate. Oxygen content remains below 8 ppm, moisture under 0.02%, crushing efficiency increases by 40%, and nitrogen cost savings exceed 50.5 million yuan annually.
Micronization of Pharmaceutical Raw Materials
Epic Powder’s closed-loop system achieves D90 < 5 μm for API crushing, active ingredient oxidation loss under 0.5%, and passes FDA audit.
Metal Powder Explosion-Proof Processing
In a titanium powder project, Epic Powder equipment runs for 500 hours with 99.99% nitrogen purity, eliminating dust explosion risks.
4. Three Major Marketing Highlights of Epic Powder Explosion-Proof Air Jet Mills
Full Industry Chain Technology Integration
Epic Powder offers one-stop solutions, covering nitrogen compression, purification, crushing, and recycling. Equipment meets the needs of industries like lithium batteries, pharmaceuticals, and chemicals, with customized modules (e.g., CIP cleaning).
Cost Optimization and Green Production
With a 30% inert gas recycling rate, we help customers achieve eco-friendly goals.
Global Compliance and Localized Services
Our equipment complies with ATEX explosion-proof certification, with 24-hour customer support.
5. Future Outlook
As the new energy and bio-pharmaceutical sectors grow, Epic Powder will deepen research into ultrafine grinding and nanomaterial preparation, optimize air jet mill parameters, and upgrade explosion-proof air jet mills to smart, zero-carbon solutions.
For detailed technical solutions or customized requirements, please feel free to contact us.