A Case Study of a Bentonite Mixed Pneumatic Conveying Project for a Building Materials Enterprise in Shenyang, Liaoning

In the northeastern industrial hub of Shenyang, Liaoning Province, a prominent building materials enterprise recently implemented a state-of-the-art bentonite hybrid pneumatic conveying system to modernize its powder handling operations. The project, executed by Shandong Headpowder Engineering Co., Ltd., represents a benchmark case in the field of hybrid pneumatic conveying for building materials powder. The enterprise required a reliable, efficient, and dust-free solution to transport large volumes of bentonite—a highly absorbent clay mineral widely used in cement, mortar, and sealant production—from storage silos to multiple production points. By adopting a hybrid conveying approach that combines dilute-phase and dense-phase technologies, the system achieved remarkable flexibility, reduced energy consumption, and minimized material degradation. This Shenyang case has since become a reference example for similar facilities seeking to upgrade their bulk material handling infrastructure.

The core challenge lay in the unique physical properties of bentonite. Its fine particle size, high moisture affinity, and tendency to agglomerate under pressure made conventional pneumatic conveying methods inefficient. The hybrid system designed by Headpowder ingeniously integrates a positive-pressure dense-phase loop for long-distance horizontal transport with a dilute-phase suction line for short-distance vertical lifts. This dual-mode operation ensures that the bentonite is conveyed at low velocity in the dense phase to prevent pipe wear and particle breakage, while the dilute phase provides rapid discharge into mixers. The result is a seamless, continuous flow that maintains product integrity and boosts overall throughput. The project team also incorporated automatic moisture control and real-time pressure monitoring, further enhancing process stability. This hybrid pneumatic conveying case demonstrates how tailored engineering can solve complex material handling problems in the building materials sector.

Product and Solution: Bentonite Hybrid Conveying System for Building Materials Powder

At the heart of the Shenyang installation is the bentonite hybrid conveying system, specifically engineered for building materials powder transport. The system comprises a series of rotary feeders, airlocks, pipeline networks, and a central control unit that manages the transition between conveying modes. The hybrid design allows the system to handle not only bentonite but also other fine powders such as fly ash, cement, and gypsum, making it a versatile asset for multi-product plants. The key product keyword "bentonite hybrid conveying" is fully embodied in this solution: the dense-phase section operates at high pressure (up to 4 bar) with a material-to-air ratio exceeding 30:1, while the dilute-phase section uses low pressure (0.5–1.5 bar) and high velocity for rapid transfer. This dual-capability eliminates the need for separate systems, reducing capital expenditure and floor space.

For the building materials industry, the "building materials powder conveying" functionality is critical. The system is equipped with wear-resistant bends and ceramic linings to withstand the abrasive nature of bentonite. A dedicated filter receiver at the destination point ensures zero dust emission, meeting stringent environmental regulations in Liaoning. The control software, developed by Headpowder, includes a user-friendly interface that allows operators to adjust conveying parameters on the fly. During the project, the system underwent rigorous testing with bentonite batches of varying moisture content (from 5% to 15%), and it consistently delivered a conveying rate of 12 tons per hour with less than 1% degradation. This performance data underscores the reliability of the hybrid pneumatic conveying case, which has been documented as a success story for the entire region. The enterprise reported a 30% reduction in energy costs and a 50% decrease in maintenance downtime compared to their previous mechanical conveyor system.

Key Advantages of Hybrid Pneumatic Conveying for Building Materials Powder

The hybrid pneumatic conveying approach offers several distinct advantages that make it ideal for bentonite and other building materials powders. First, the combination of dense-phase and dilute-phase technologies allows the system to adapt to changing material characteristics and production demands. For bentonite, which can become sticky when moist, the dense-phase mode prevents blockages by maintaining a plug flow regime, while the dilute-phase mode quickly clears residual material after each batch. Second, the closed-loop design minimizes environmental contamination—a crucial factor in urban areas like Shenyang where air quality standards are strict. Third, the system's modular construction enables easy expansion; the enterprise has already planned to add a second line for cementitious powder blending. Fourth, the low-velocity dense-phase transport significantly reduces pipe erosion, extending the lifespan of conveying components by up to three times compared to conventional high-velocity systems.

From an operational perspective, the hybrid system integrates seamlessly with existing plant automation. The Shenyang site uses a PLC-based control that communicates with upstream grinding mills and downstream bagging machines. Real-time data on flow rate, pressure differential, and material level are displayed on a central HMI, allowing operators to fine-tune performance. The system also features an automatic purge cycle that cleans the pipeline after each material change, preventing cross-contamination when switching between bentonite and other powders. This level of control is particularly valuable for building materials enterprises that produce multiple formulations. The "mixed pneumatic conveying" concept is further enhanced by the ability to inject air at multiple points along the pipeline, ensuring consistent velocity even over long distances. In the Shenyang case, the longest horizontal run exceeded 200 meters without any performance loss. These technical merits make the hybrid pneumatic conveying case a compelling solution for any building materials powder handling challenge.

Project Implementation and Technical Details

The implementation of the bentonite hybrid pneumatic conveying system in Shenyang followed a structured engineering process. Headpowder's team conducted a thorough site survey, analyzing the existing layout, available power supply, and material flow requirements. Based on the survey, they designed a custom pipeline network with a total length of 450 meters, including 120 meters of dense-phase transport and 330 meters of dilute-phase segments. The system uses a screw compressor for the dense-phase air supply and a roots blower for the dilute-phase section, each optimized for energy efficiency. The material feeding point is equipped with a vibratory bin activator to prevent bridging, and the discharge point features a rotary valve with a variable-speed drive. The entire system was installed within a 6-week construction window, with minimal disruption to ongoing production. Commissioning involved a 72-hour continuous run, during which the system handled over 800 tons of bentonite without any unscheduled stops.

Performance validation was conducted using a combination of laser particle size analysis and moisture measurement. The results showed that the bentonite maintained its original particle size distribution (d50 = 45 microns) with less than 0.5% fines generation, confirming the gentle handling capability of the hybrid method. The enterprise also tested the system with a batch of high-moisture bentonite (12% water content) and found that the dense-phase operation prevented any clogging, while the subsequent dilute-phase purge cleared the line perfectly. These outcomes directly align with the project's objectives: to achieve reliable, efficient, and quality-preserving conveying. The success of this project has led to follow-up inquiries from other building materials enterprises in the Liaoning region, and Headpowder has already begun discussions for a similar installation in Dalian. The Shenyang case remains a flagship example of how hybrid pneumatic conveying can transform building materials powder handling, and it is frequently cited in industry conferences as a benchmark for best practices.

About Shandong Headpowder Engineering Co., Ltd.

Shandong Headpowder Engineering Co., Ltd., headquartered in China's Shandong Province, is a specialized engineering firm dedicated to the design and manufacture of pneumatic conveying systems for bulk solids. With over a decade of experience, the company has delivered hundreds of projects across the building materials, chemical, and food industries. The company's core expertise lies in hybrid pneumatic conveying, bentonite hybrid conveying, and building materials powder conveying solutions. Headpowder's engineering team comprises PhD-level material scientists and mechanical engineers who continuously innovate to improve system efficiency and reliability. Every project, including the Shenyang bentonite hybrid conveying case, is approached with a commitment to customization, quality, and after-sales support. The company's workshop in Shandong is equipped with advanced testing facilities, including a full-scale pilot conveying loop that can simulate real-world conditions before installation.

For inquiries regarding bentonite hybrid conveying systems, building materials powder conveying, or any hybrid pneumatic conveying case, please contact the sales team. Manager Zhang, the dedicated project consultant for the Shenyang case, is available to provide detailed technical recommendations and quotations. You can reach Manager Zhang directly via WeChat at 15662777102. Whether you are planning a new plant or upgrading an existing line, Shandong Headpowder Engineering Co., Ltd. offers comprehensive engineering services from concept to commissioning. The company's address in China's Shandong Province positions it as a strategic partner for clients across Asia and beyond. Attention to detail, proven performance, and a customer-centric approach define every project delivered by Headpowder. For more information, contact Manager Zhang via WeChat: 15662777102. The team looks forward to discussing how hybrid pneumatic conveying can optimize your building materials powder handling operations.