Calcium Carbonate
Ultra-Fine Coating Machine
Introduction
The Calcium Carbonate Ultra-Fine Coating Machine is a closed-circuit surface coating system that combines a high-speed coating machine with an integrated classifier to deliver consistent, high-efficiency powder coating results. The Coating Machine and Classifier combination is the industry standard adopted by many of the world’s leading powder processing companies, with technology and product quality benchmarks aligned with European and American standards.
The system is designed to coat the surface of ultra-fine powder materials, primarily calcium carbonate, with stearic acid and similar coating agents. Surface coating transforms uncoated mineral powder into a hydrophobic, compatibilized product suitable for use in plastics, rubber, paper, coatings, and other high-value manufacturing applications. The closed-circuit classifier integration ensures that agglomerated particles are continuously re-processed, maintaining coating uniformity and efficiency throughout production.
Application Range
The Ultra-Fine Coating Machine is primarily used for surface coating of calcium carbonate powder for downstream applications in plastics compounding, rubber manufacturing, paper filling, paint and coating production, adhesives, and sealants.
It is also suitable for surface treatment of other non-metallic mineral powders including talc, kaolin, barite, and wollastonite where hydrophobic surface modification is required to improve compatibility with polymer matrices or to meet specific end-product performance requirements.
Ultra-Fine Coating Process: Coating Machine + Classifier
The Coating Machine + Classifier system is a closed-circuit ultra-fine surface coating technology widely adopted by leading global powder processing companies. By integrating a high-speed coating machine directly with a classifier, the system creates a continuous closed-circuit coating cycle that guarantees complete and uniform surface treatment of every particle before it reaches the final collection stage.
This combined approach eliminates the inconsistencies of conventional open-circuit coating machines, where agglomerated or insufficiently coated particles pass through unchecked. The Coating Machine + Classifier configuration recirculates all non-conforming particles back through the coating machine automatically, ensuring coating efficiency consistently reaches up to 99% and that every batch meets the required quality standard.
The technology and product quality standards of this coating production line are benchmarked against European and American industry standards and are trusted by many of the world’s top powder processing companies.
Features and Characteristics
1. Closed-circuit Coating Machine and Classifier combination adopted by leading global powder processing companies, with technology and quality standards benchmarked against European and American industry standards.
2. Integrated classifier returns agglomerated particles from the coating process back into the coating machine for re-processing, ensuring complete depolymerization and consistent coating coverage across all particles.
3. Lower installed power consumption compared to conventional coating machines, with heat closed-circuit circulation reducing energy costs while maintaining high output capacity.
4. Stearic acid and coating agent consumption is significantly reduced compared to open-circuit systems, with coating efficiency reaching up to 99%.
5. Fully enclosed negative pressure operation with no dust emissions at the working site, meeting environmental protection requirements for industrial powder processing facilities.
6. Core rotor blades manufactured from imported German wear-resistant steel with a linear speed capability of up to 115 m/s, ensuring long service life and consistent high-speed coating performance.
Coating Process Flow
The ultra-fine coating process operates as a continuous closed-circuit cycle. Powder and stearic acid or other coating agents are fed simultaneously into a screw conveyor through a quantitative feeder. After initial mixing, hot air from the hot blast stove carries the mixed materials into the high-speed coating machine where intensive mixing and surface coating takes place.
The coated powder and coating agent then enter the classifier together with the process airflow. The classifier separates qualified coated particles from agglomerated or insufficiently coated material. Qualified particles proceed to the dust collector for cooling and packaging. Agglomerated or uncoated particles are discharged from the classifier and returned directly to the coating machine for further processing, completing the closed-circuit cycle.
This continuous recirculation ensures that every particle receives complete and uniform surface coating before reaching the final collection stage.
SPECIFICATION DATA
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Tell us your powder material, required coating agent, and production capacity. Our engineering team will design the right Coating Machine and Classifier configuration for your processing line.