This project case details a successful implementation of a nitrogen circulation pneumatic conveying system for aluminum nitride powder, delivered by Shandong Headpowder Engineering Co., Ltd. (headpowder) to a leading electronics manufacturer located in Changsha, Hunan Province. The customer specializes in producing advanced electronic ceramic components, and the raw material involved is high-purity aluminum nitride powder, a critical ingredient for high-performance electronic ceramics. The core challenge was to transport this fine, reactive powder safely and efficiently under nitrogen protection to prevent oxidation and moisture absorption, ensuring consistent product quality. Headpowder’s engineering team designed a fully enclosed, nitrogen‑circulated pneumatic conveying solution that not only meets the stringent purity requirements but also optimizes energy consumption and operational safety.
The customer, a well‑established electronics enterprise in Changsha, was facing increasing production demands for aluminum nitride‑based ceramic substrates and heat sinks. These products are widely used in power electronics, LED lighting, and 5G communication modules. The raw material, aluminum nitride powder, is extremely sensitive to oxygen and humidity. Even trace exposure can lead to surface oxidation, which degrades thermal conductivity and electrical insulation properties of the final ceramic parts. The customer required a reliable nitrogen‑protected conveying system that could transport the powder from storage silos to various processing stations without any contact with ambient air. Additionally, the system had to maintain a stable nitrogen atmosphere, minimize dust emission, and reduce mechanical wear on the powder particles. The plant layout also imposed space constraints, calling for a compact yet flexible conveying solution.
Aluminum nitride powder poses several unique challenges for pneumatic conveying. First, its fine particle size, typically in the range of 1–10 microns, makes it highly prone to dusting and electrostatic buildup. Second, the material is abrasive, which can accelerate wear on pipe bends and conveying components. Third, the powder’s tendency to absorb moisture and oxidize requires a completely inert environment. Traditional open‑loop pneumatic systems using compressed air are unsuitable because air contains oxygen and moisture. Therefore, a closed‑loop nitrogen circulation system was the only viable option. Headpowder’s engineers had to design a system that could recirculate nitrogen gas, recover and reuse the gas, and maintain a positive pressure differential to prevent air ingress. The system also needed to handle variable feed rates while maintaining consistent powder flow without blockages or segregation.
Shandong Headpowder Engineering Co., Ltd. proposed a customized nitrogen circulation pneumatic conveying system tailored to the specific properties of aluminum nitride powder. The system comprises a nitrogen‑sealed storage hopper, a rotary airlock feeder, a dense‑phase conveying pipeline, a cyclone separator, a bag filter, and a nitrogen recirculation unit. The entire conveying loop is maintained under a controlled nitrogen atmosphere with oxygen content below 0.5%. The nitrogen gas is recirculated through a closed loop: after the powder is separated, the gas passes through a cooler and a dryer to remove any residual moisture and heat, then is compressed and returned to the conveying line. This design significantly reduces nitrogen consumption compared to once‑through systems, lowering operational costs. The conveying velocity is carefully optimized to avoid particle degradation while ensuring reliable transport over distances up to 80 meters.
The core equipment includes a specially designed rotary airlock that prevents nitrogen leakage and powder backflow. The conveying pipeline uses wear‑resistant ceramics in high‑wear zones to extend service life. The cyclone separator and bag filter achieve a separation efficiency of 99.9%, ensuring that the powder is recovered with minimal loss. The nitrogen recirculation unit is equipped with an oxygen analyzer and automatic purge valves to maintain safety and purity. For the customer’s electronic ceramic raw material handling, the system provides several advantages: it preserves the original particle morphology of aluminum nitride powder, prevents oxidation, and eliminates moisture contamination. The system also supports automated control, allowing operators to adjust feed rates, nitrogen pressure, and conveying speed from a central PLC panel. This level of precision is essential for consistent quality in downstream ceramic forming processes.
The project was executed in three phases: design and simulation, equipment fabrication, and on‑site installation and commissioning. Headpowder’s team worked closely with the customer’s process engineers to align the system with existing production lines. During commissioning, the system achieved a conveying capacity of 1.5 tons per hour with a nitrogen consumption of less than 10 cubic meters per ton of powder, both exceeding the customer’s specifications. The oxygen level inside the conveying loop was continuously maintained below 0.3%, well within the required limit. The customer reported a significant reduction in powder waste and a noticeable improvement in the consistency of their ceramic products. The system has been operating reliably for over 18 months without any major maintenance issues. This case has become a benchmark for nitrogen‑protected conveying of fine ceramic powders in the electronics industry.
Shandong Headpowder Engineering Co., Ltd. (headpowder) is a specialized engineering company based in Shandong, China, with extensive experience in designing and manufacturing pneumatic conveying systems for fine powders, particularly for sensitive materials like aluminum nitride, silicon nitride, and other advanced ceramic raw materials. The company’s expertise covers dense‑phase, dilute‑phase, and nitrogen‑circulation conveying technologies. Headpowder has successfully delivered numerous projects for electronic ceramic, battery material, and chemical industries. The engineering team provides comprehensive support from feasibility study to commissioning and after‑sales service. For this project, the customer specifically appreciated headpowder’s ability to customize the system for their unique powder characteristics and plant layout, as well as the prompt technical support during the commissioning phase.
For more information about nitrogen‑protected pneumatic conveying systems for aluminum nitride powder or other electronic ceramic raw materials, please contact the project manager at Shandong Headpowder Engineering Co., Ltd. The contact person is Manager Zhang, available via WeChat: 15662777102. Headpowder’s team is ready to discuss your specific material handling requirements and provide tailored solutions to enhance your production efficiency and product quality.
This project case demonstrates the successful application of nitrogen circulation pneumatic conveying for aluminum nitride powder in an electronics enterprise in Changsha, Hunan, highlighting the importance of inert atmosphere protection, customized engineering, and reliable equipment for high‑value electronic ceramic raw materials. Shandong Headpowder Engineering Co., Ltd. remains committed to delivering innovative conveying solutions that meet the most demanding purity and safety standards.
Shandong Headpowder Engineering Co., Ltd.
156-6277-7102（Zhang manager） 
0531-83386006 
Jinan City, Shandong, China Province 
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