Shandong Headpowder Engineering Co., Ltd. (headpowder) recently completed a highly specialized project for a leading metallurgical enterprise located in Kunming, Yunnan Province. The core objective was to design and implement a nitrogen gas circulation pneumatic conveying system tailored for the safe and efficient transport of ultrafine copper powder. This case study highlights the unique challenges associated with handling highly oxidizable metal powders and demonstrates the advanced engineering capabilities of headpowder in delivering a reliable, closed-loop nitrogen atmosphere solution.
The client's production line involved the processing of ultrafine copper powder with an average particle size below 10 microns. Such materials are classified as easily oxidizable metal powders due to their extremely high surface area to volume ratio, which makes them prone to rapid oxidation when exposed to oxygen or moisture in the ambient air. Oxidation not only degrades the quality and purity of the copper powder, leading to discoloration and reduced electrical conductivity, but also introduces significant safety hazards, including the risk of dust explosion. Traditional pneumatic conveying systems using compressed air are unsuitable because they introduce oxygen, accelerate oxidation, and can cause agglomeration of the fine particles. Therefore, an inert atmosphere was mandatory. The project required a nitrogen gas circulation pneumatic conveying system that could maintain a consistently low oxygen level throughout the entire conveying loop, from the feed point to the storage silo, while also preventing particle attrition and maintaining the ultra-fine particle size distribution.
headpowder engineered a custom-designed nitrogen gas circulation pneumatic conveying system that integrates several key components. The system employs a dense-phase pneumatic conveying principle, which minimizes gas velocity and reduces particle degradation compared to dilute-phase systems. The nitrogen used as the conveying gas is continuously recirculated through a closed loop, passing through a gas purification unit that removes any trace oxygen, moisture, and fine dust. The purified nitrogen is then compressed and reused, drastically reducing overall nitrogen consumption and operational costs. A sophisticated oxygen monitoring and control system is installed at multiple points along the conveying line, ensuring that the oxygen concentration remains below 1% (vol) at all times. The system also features specialized feeding devices, such as a rotary valve with nitrogen purge, to prevent air ingress during material introduction. For the ultrafine copper powder, headpowder selected wear-resistant piping materials and optimized the bend radii to minimize particle breakage and wall erosion.
This successful project serves as a benchmark case for nitrogen gas circulation pneumatic conveying of ultrafine copper powder. The core technology—a closed-loop nitrogen atmosphere with real-time oxygen control—is directly applicable to other easily oxidizable metal powders, including aluminum powder, magnesium powder, zinc powder, and various metal alloy powders. The system's ability to maintain a stable inert environment while conveying high-value, ultrafine materials is a critical advantage for industries such as electronics, battery manufacturing, powder metallurgy, and additive manufacturing. headpowder's expertise in handling such challenging materials is demonstrated by the seamless integration of the nitrogen circulation system with the client's existing production line, achieving a conveying capacity of 500 kg/h over a distance of 80 meters without any detectable oxidation or quality loss during the first 12 months of continuous operation.
The installation was completed within a 6-week timeframe, followed by a comprehensive commissioning phase that included leak testing, oxygen level validation, and particle size analysis. The final system achieved an oxygen concentration of less than 0.5% across the entire conveying path, well below the client's specification of 1%. The nitrogen consumption was reduced by 70% compared to a once-through nitrogen system, resulting in substantial annual savings. Moreover, the product quality remained consistent: the copper powder retained its original metallic luster and electrical conductivity, and the particle size distribution showed no significant change before and after conveying. The client reported zero oxidation-related rejects and a significant improvement in workplace safety due to the elimination of oxygen and dust hazards. This case study underscores the effectiveness of headpowder's engineered solutions for the safe and efficient handling of oxidizable metal powders.
headpowder, based in Shandong, China, is a specialized engineering company focused on providing advanced pneumatic conveying systems, dust collection, and powder processing solutions for the global metallurgy, chemical, and new materials industries. With years of experience in designing systems for ultrafine, cohesive, and hazardous powders, headpowder has developed proprietary technologies for nitrogen circulation, inert gas blanketing, and explosion-proof conveying. The company's team of experienced engineers works closely with clients to deliver turnkey solutions, from conceptual design and equipment fabrication to installation, commissioning, and after-sales support. For inquiries about similar projects or custom solutions for your material handling needs, please contact us.
For more details on the Kunming ultrafine copper powder nitrogen gas circulation pneumatic conveying project or to discuss your specific requirements for handling oxidizable metal powders, please feel free to reach out to our project manager, Mr. Zhang. He can be contacted directly via WeChat at 15662777102. headpowder is committed to providing expert consultation and tailored engineering solutions to optimize your powder processing operations. We look forward to collaborating with you.
Shandong Headpowder Engineering Co., Ltd.
156-6277-7102（Zhang manager） 
0531-83386006 
Jinan City, Shandong, China Province 
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