High-efficiency powder surface coating and modification solutions for calcium carbonate, calcite, talc, barite, and ultrafine mineral powders. Advanced three-roller technology ensures uniform coating activation rates exceeding 99%.
Years of Manufacturing Excellence
Coating Activation Rate
Countries Served Worldwide
A trusted brand with over five decades of industrial equipment manufacturing heritage
Cronus (Shanghai) Intelligent Technology Co., Ltd. is a wholly-owned subsidiary of Guilin Mining Machinery Co., Ltd., a renowned Chinese equipment manufacturer founded in 1973. With over 50 years of manufacturing heritage, our parent company has been at the forefront of grinding, milling, and powder processing technology.
Guilin Mining Machinery is recognized as a National High-Tech Enterprise, a holder of multiple invention patents, and certified under ISO 9001 (Quality Management), ISO 14001 (Environmental Management), ISO 45001 (Occupational Health and Safety), and CE standards. These certifications reflect our unwavering commitment to quality, safety, and environmental stewardship.
Cronus leverages this rich legacy to deliver world-class stone powder coating machines, providing comprehensive powder surface modification solutions to customers across more than 30 countries.
Internationally recognized quality and safety certifications
How the three-roller powder surface coating machine achieves uniform modification
Ultrafine mineral powder is fed into the machine at a precisely controlled rate through a screw conveyor, ensuring stable and continuous material flow into the modification chamber.
Inside the modification chamber, three rotating rollers operating at high speed create a powerful vortex. The powder particles are fully fluidized and dispersed, maximizing the contact surface area between each particle and the coating agent.
The modifier (typically stearic acid or a coupling agent) is atomized and uniformly sprayed into the vortex through a precision metering pump. The high-temperature environment inside the chamber (generated by friction) ensures the coating agent melts and bonds effectively to each particle surface.
Once the coating process is complete, the modified powder exits the chamber and passes through a cooling system before collection. The final product demonstrates excellent hydrophobicity, dispersibility, and compatibility with polymer matrices.
Key advantages that set our stone powder coating machines apart
Three-roller vortex fluidization ensures every powder particle receives uniform coating treatment, achieving activation rates consistently above 99%.
Friction-generated heat eliminates the need for external heating, reducing energy consumption by up to 40% compared to conventional modification equipment.
Unlike batch-type machines, our continuous feeding and discharging system supports 24/7 uninterrupted production, significantly boosting throughput.
Fully automated PLC control system with real-time monitoring of temperature, feeding speed, modifier dosage, and rotor RPM for consistent product quality.
Critical components are made from high-chromium wear-resistant alloy steel with advanced heat treatment, ensuring extended service life even under heavy-duty operation.
Fully enclosed negative-pressure operation with integrated dust collection prevents powder leakage, meeting the strictest environmental regulations.
Modular design with quick-access panels allows rapid inspection and replacement of wear parts, minimizing production downtime.
Suitable for powders from 325 mesh to 3000 mesh (D97: 5-45 um), covering everything from standard GCC to ultrafine nanometer-grade powders.
Cronus offers multiple models of three-roller coating machines to meet diverse production needs
| Model | Motor Power (kW) | Rotor Speed (rpm) | Capacity (t/h) | Particle Size (mesh) | Dimensions (mm) | Weight (t) |
|---|---|---|---|---|---|---|
| CLG-300 | 2 x 22 | 1500-2500 | 0.2-0.8 | 325-3000 | 3600 x 1200 x 2100 | 2.8 |
| CLG-500 | 2 x 37 | 1200-2000 | 0.5-1.5 | 325-3000 | 4500 x 1500 x 2400 | 4.2 |
| CLG-600 | 2 x 55 | 1000-1800 | 1.0-3.0 | 325-3000 | 5200 x 1700 x 2700 | 5.8 |
| CLG-800 | 2 x 75 | 800-1500 | 2.0-5.0 | 325-2500 | 6200 x 2000 x 3100 | 8.5 |
| CLG-1000 | 2 x 110 | 600-1200 | 3.5-8.0 | 325-2000 | 7200 x 2300 x 3500 | 12.0 |
Our coating machines serve a wide range of mineral powder modification applications
Ground calcium carbonate modified with stearic acid for plastics, rubber, masterbatch, PVC pipes, and paint fillers.
Ultrafine calcite powder surface treatment for high-end coatings, papermaking, adhesives, and sealants.
Surface-modified talc for polypropylene (PP) automotive parts, engineering plastics, and anti-blocking agents.
Modified barite for drilling fluids, radiation shielding, high-density plastics, and brake pad compounds.
Surface-treated kaolin for rubber reinforcement, cable insulation, ceramic glazes, and paper coating.
Modified wollastonite fibers for friction materials, construction compounds, and nylon reinforcement.
Coated dolomite powder for glass manufacturing, refractory materials, agricultural soil conditioners, and construction.
Surface-modified silica for epoxy molding compounds, electronic encapsulants, and high-performance coatings.
Watch our stone powder coating machine in operation at customer sites
Trusted by customers worldwide - real project deployments across the globe
Complete calcite powder coating production line with CLG-600 coating machine. Client processes 2 tons/hour of 1250-mesh calcite powder modified with stearic acid for the local PVC and masterbatch industry. Installed in 2015, the equipment continues to deliver excellent performance.
Ultrafine powder grinding and coating integrated line for calcium carbonate. Combined Raymond mill with CLG-500 coating machine for 2000-mesh GCC production used in high-end paint and coating applications in the Middle East market.
Large-scale mineral processing project featuring 2 sets of 1250-type ultrafine grinding mills and 2 sets of CLG-600 coating machines. This integrated production line delivers high-volume modified calcium carbonate powder for the Yangtze River Delta plastics and rubber industry cluster.
Common questions about our stone powder coating machines
A stone powder coating machine (also known as a powder surface modification machine or three-roller modifier) is specialized equipment used to apply a surface treatment agent (typically stearic acid, titanate coupling agent, or aluminate coupling agent) onto ultrafine mineral powder particles. The machine uses a high-speed three-roller vortex mechanism to fluidize the powder, then atomizes the modifier into the chamber. Friction-generated heat melts the coating agent, which bonds uniformly to each particle surface, transforming hydrophilic mineral powder into hydrophobic, organophilic material suitable for polymer compounding.
Our coating machine is suitable for a wide range of non-metallic mineral powders including: calcium carbonate (GCC and PCC), calcite, talc, barite, kaolin, wollastonite, dolomite, mica, silica/quartz, barium sulfate, aluminum hydroxide, magnesium hydroxide, and other inorganic fillers. The particle size range is 325 mesh to 3000 mesh.
Cronus three-roller coating machines consistently achieve an activation rate of over 99%, as verified by the standard methanol flotation test. The unique vortex fluidization design ensures that virtually every powder particle receives uniform coating treatment without dead zones or untreated clusters.
The three high-speed rollers compress and shear the powder particles at high velocity, generating frictional heat that raises the internal temperature to 100-140 C naturally. This temperature is precisely the melting range of stearic acid (commonly used modifier), allowing it to melt and coat particles without any external heating element. This eliminates electrical heating costs and reduces energy consumption by approximately 40%.
For calcium carbonate modification with stearic acid, the typical dosage is 0.8-1.5% by weight of the powder being processed. The exact dosage depends on particle size (finer powder requires slightly more modifier) and target application requirements. Our PLC control system allows precise metering to optimize modifier usage and minimize costs.
Standard models typically ship within 30-45 days after order confirmation. We provide comprehensive installation guidance, either remotely (with detailed manuals and video support) or on-site with our engineers dispatched to your location. Our after-sales team offers lifelong technical support and spare parts supply.
Cronus and its parent company Guilin Mining Machinery hold ISO 9001 (Quality Management), ISO 14001 (Environmental Management), ISO 45001 (Occupational Health and Safety), and CE certifications. We are also recognized as a National High-Tech Enterprise and hold multiple invention and utility model patents for our equipment designs.
Yes. We offer customization options including rotor speed adjustment range, wear-resistant material upgrades, automated dosing system configurations, dust collection capacity, and integration with upstream/downstream equipment (grinding mills, classifiers, packing machines). Contact our engineering team to discuss your specific requirements.
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