The coarse-fine separator is the core grading equipment for dry powder processing and powder-making systems. It precisely separates milled powder into qualified fine powder and unqualified coarse powder through a composite force field of centrifugal force, airflow force, and gravity. The coarse powder is recycled for re-grinding, while the fine powder is collected as finished product, serving as the "intelligent sieve" for industries such as cement, mineral powder, coal powder, fly ash, heavy calcium, and non-metallic minerals. It directly determines the fineness, yield, and energy consumption of the finished product.

I. Core Application Scenarios

Electricity: Boiler pulverizing system (steel ball mill / medium-speed mill), coal powder grading for coarse and fine sizes, ensuring combustion efficiency.

Building Materials: Cement Raw Materials / Clinker, Slag Micro-fine, Fly Ash, Limestone Powder Selection

Mining / Chemicals: Heavy Calcium Carbonate, Talc, Quartz, Kaolin, etc. Non-metallic Mineral Powders Classification

Environmental Protection: Solid Waste Powder Grinding, Construction Waste Recycling Powder Coarse and Fine Separation

2. Working Principle (Composite Grading)

Mainstream features include dynamic eddy current, gravity sedimentation, and secondary washing for three-stage separation; the entire process is sieve-free and clog-proof.

Pre-dispersion and coarse separation: Materials are thrown by a high-speed spreader, forming a uniform material curtain. Coarse particles settle first due to gravity/centrifugal force, completing a primary coarse separation.

Electrostatic precision grading: High-speed rotation of the drum/rotor generates forced vortex, fine particles are lifted by the airflow through the blade gaps, while coarse particles are ejected by centrifugal force, achieving precise grading.

Secondary washing: The coarse powder that falls is subjected to a second air wash, separating the fine powder once more, enhancing classification efficiency, and reducing the phenomenon of coarse powder containing fine particles and fine powder containing coarse particles.

Finished Product Collection: Finely milled powder enters the cyclone / bag dust collector with the air flow, while coarse powder is discharged through the conical hopper for re-grinding and re-crushing.

Section 3: Core Performance Advantages

High grading accuracy: Clear particle size cut, free of coarse particles in fine powder, less fine powder mixed with coarse powder, improving the pass rate of finished products by 15%-20%.

Adjustable fineness: Variable frequency speed control drum speed + air volume adjustment, fineness adjustable from 100-1600 mesh continuously, quick product changeover

Wear-resistant and durable: Abrasion-resistant lining on vulnerable areas / 40Cr round steel turntable, resistant to erosion and long lifespan, reducing downtime for maintenance and repairs

Energy-saving and Consumption Reduction: Flow field optimization, low air resistance, reducing energy consumption by 20%-30% compared to traditional classifier equipment, and increasing the production output of the mill by 10%-30%.

Operation Stable: Over-determined structure, dry oil lubrication, low vibration, no dust leakage, suitable for continuous production