Case Study of a Mixed Pneumatic Conveying Project for Talc Powder in a Papermaking Enterprise in Baoding, Hebei

In the competitive landscape of paper manufacturing, the efficiency of raw material handling directly impacts production quality and operational cost. A prominent paper mill located in Baoding, Hebei Province, China, recently implemented a state-of-the-art talc powder mixed pneumatic conveying system to streamline its filler addition process. This project, executed by Shandong Headpowder Engineering Co., Ltd. (headpowder), demonstrates the technical excellence of integrated pneumatic conveying solutions for the paper industry. The core requirement was to transport talc powder—a critical filler for paper making—from storage to the paper machine headbox with minimal dust, precise dosing, and reliable continuous operation. The traditional mechanical conveying methods were replaced by a mixed-phase pneumatic system that combines dense-phase and dilute-phase principles, ensuring optimal material handling for talc powder with varying particle sizes and moisture content.

Project Background and Challenges

The client, a medium-sized paper mill in Baoding, produces high-quality printing and writing paper. They previously relied on manual bag dumping and screw conveyors to feed talc powder as a filler. This approach led to frequent dust emissions, inconsistent filler dosage, and high maintenance costs. The talc powder, widely used as a paper filler to improve opacity, brightness, and printability, required a conveying solution that could handle its abrasive nature and avoid product degradation. The mill needed a fully enclosed, automated system capable of delivering talc powder to multiple paper machine silos simultaneously. The key challenges included: (1) fine talc powder tends to fluidize and form dust clouds; (2) the conveying distance exceeded 80 meters with several vertical bends; (3) the desired mixing ratio of talc powder with other fillers had to be adjustable during operation. Shandong Headpowder Engineering Co., Ltd. was selected based on its proven track record in mixed pneumatic conveying engineering for bulk solids handling.

Technical Solution: Mixed Pneumatic Conveying for Talc Powder

The project adopted a mixed-phase pneumatic conveying system specifically designed for talc powder mixed conveying. This technology combines the advantages of dilute-phase conveying (high velocity, low pressure) for long-distance transport and dense-phase conveying (low velocity, high pressure) for gentle handling of fragile materials. The system comprises a positive displacement blower, a rotary airlock feeder, a series of diverting valves, and a proprietary mixing chamber. Talc powder is first fed from a bulk storage silo into the rotary valve, which meters the material into the air stream. The air velocity is precisely controlled to maintain a stable suspension of talc particles while preventing pipe wear. For the paper filler application, the mixed pneumatic conveying system enables simultaneous transport of talc powder and other additives (e.g., calcium carbonate, clay) through a single pipeline, with in-line blending achieved via a static mixer near the receiving hopper. This approach eliminates the need for separate conveying lines and reduces capital expenditure. The system is equipped with a PLC-based control unit that monitors pressure, flow rate, and material density, automatically adjusting the air-to-material ratio to maintain consistent conveying conditions.

Key Equipment and Engineering Features

Shandong Headpowder Engineering Co., Ltd. provided the complete turnkey solution, including the design of the pipeline layout, selection of wear-resistant pipes (ceramic-lined steel), and installation of dust collection units at all transfer points. The core equipment includes a heavy-duty rotary airlock feeder with hardened tips to withstand talc abrasion, a high-efficiency cyclone separator, and a bag filter for residual dust capture. The mixed pneumatic conveying system operates at a conveying capacity of 5 tons per hour over a horizontal distance of 120 meters and a vertical lift of 15 meters. One of the standout features is the “smart diverter valve” that allows the operator to switch the talc powder flow between different paper machine silos without interrupting the conveying process. This flexibility is crucial for paper mills that produce multiple grades requiring different filler formulations. The system also incorporates a nitrogen purge system to prevent static electricity buildup, a common hazard when conveying fine talc powder. All components are designed according to international standards for pneumatic conveying engineering, ensuring compliance with safety and environmental regulations.

Operational Benefits and Performance Results

After commissioning, the Hebei Baoding paper mill achieved significant improvements in its filler addition process. The talc powder mixed pneumatic conveying system reduced dust emissions by over 95%, creating a cleaner working environment. The precise metering capability allowed the mill to maintain a consistent talc dosage of 8-12% by weight of the paper furnish, resulting in improved paper opacity and reduced filler consumption. The mixed conveying feature enabled the mill to blend talc powder with other paper fillers (such as calcined clay) in a 3:1 ratio directly in the pneumatic line, reducing the need for separate mixing tanks. Maintenance costs dropped by 60% because the enclosed system minimized wear on mechanical parts. The PLC-based control system also provided real-time data on material flow, enabling the mill’s production team to optimize the filler recipe for different paper grades. Overall, the project demonstrated how modern mixed pneumatic conveying engineering can transform a traditional paper mill’s raw material handling into a clean, efficient, and automated process.

Why Choose Shandong Headpowder Engineering Co., Ltd. for Your Project

Shandong Headpowder Engineering Co., Ltd., known in the industry as headpowder, is a specialized engineering firm based in Shandong, China, with decades of experience in designing and implementing pneumatic conveying systems for bulk solids. Our expertise covers talc powder mixed conveying, paper filler conveying, and mixed pneumatic conveying engineering for a wide range of industries including paper, chemicals, food, and minerals. We provide customized solutions that consider the unique properties of the material—such as particle size distribution, bulk density, and abrasiveness—as well as the plant layout and operational constraints. For the Hebei Baoding project, our team conducted a thorough site survey, computational fluid dynamics (CFD) simulation of the pipeline, and full-scale testing of the system before installation. This rigorous approach ensures that every mixed pneumatic conveying system we deliver meets the highest standards of performance and reliability. If you are looking to upgrade your talc powder or paper filler conveying system, contact us to discuss your specific requirements. Zhang, the project manager, is available to answer your questions. You can reach him via WeChat at 15662777102 for a prompt consultation. Let headpowder help you achieve cleaner, smarter, and more efficient material handling.

Contact Information

For more information about our talc powder mixed pneumatic conveying solutions or to schedule a site visit to our Hebei Baoding reference plant, please contact Zhang, the project manager, at WeChat: 15662777102. Shandong Headpowder Engineering Co., Ltd. is dedicated to providing world-class mixed pneumatic conveying engineering services for the paper industry and beyond. Our team is ready to assist you with feasibility studies, system design, equipment supply, and after-sales support. We look forward to collaborating with your company to enhance your production efficiency.