Heavy calcium carbonate powder, also known as ground calcium carbonate or GCC, is widely used in plastics, coatings, paper, rubber, and building materials. Since it is produced by mechanical grinding, its particles are sharp and abrasive. Moisture, particle size, and bulk density affect flow behavior. Poorly designed handling can cause blockages, dust, wear, and product degradation. A reliable pneumatic conveying solution must therefore be engineered around the actual powder properties.

Pneumatic conveying can be dilute phase or dense phase. Dilute phase uses high air velocity and low pressure to suspend powder in the air stream; it suits short distances and less abrasive materials. Dense phase moves powder at low velocity under positive pressure, usually as plugs or slugs. For heavy calcium carbonate, dense phase is preferred because it reduces wear, avoids particle breakage, lowers energy use, and creates less dust.

A complete system includes a feeding device, air supply, pipeline, receiving vessel, dust collector, and control panel. The feeder meters powder from a hopper or silo into the pipe. A Roots blower or compressor supplies clean dry air. The pipeline connects the source to the destination. At the receiving end, a separator removes the powder and a filter cleans the return air. Pressure, flow, and level sensors enable PLC automatic operation.

Feeder selection is critical. Rotary airlock feeders are used in continuous systems because they seal the system while feeding powder into a pressure line. Screw feeders provide accurate dosing; a pressure tank with discharge valves is ideal for dense phase. Pipe diameter, route, and bend type must minimize pressure loss and wear. Long radius bends, blind tee bends, or ceramic lined elbows are recommended for abrasive GCC. Smooth bores, supports, and proper orientation prevent buildup.

Air supply and dust collection must match system pressure and airflow. Roots blowers work well for dilute phase and low pressure dense phase. Screw compressors are selected for long distances. Variable frequency drives adjust airflow and save energy. At the receiving bin, a baghouse or cartridge filter separates powder from air. Reverse pulse jet cleaning prevents clogging. Although calcium carbonate is non-combustible, grounding, bin venting, and pressure monitoring should follow local safety regulations.

Every conveying project is customized according to material and site conditions. We test the actual GCC sample for flowability, bulk density, particle size, moisture, and abrasiveness. Then we determine capacity, distance, route, number of receiving points, and installation space. Systems can handle from 1 ton per hour to 50 tons per hour or more. Multi-point piping directs material to different silos, mixers, reactors, or packing lines. Future expansion and remote monitoring are also considered.

Enclosed pneumatic conveying keeps the plant clean, reduces product loss, and eliminates dust. It uses less floor space than belt conveyors or bucket elevators and can be routed overhead, along walls, or outdoors. The systems serve plastics, coatings, paper, dry mortar, putty, and adhesive production. Because the powder stays inside the pipeline, contamination is avoided, manual labor is reduced, and full automation can be achieved with PLC or SCADA.

Choosing the right pneumatic conveying system for heavy calcium carbonate requires careful engineering and real material data. Our company provides design, manufacturing, installation, commissioning, and after-sales support as a complete package. We help reduce downtime, lower maintenance costs, and improve production efficiency. Contact us for a tailored proposal, budget estimation, and process drawing.