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Vertical Mill And Air Classifier Production Process

When combined with the secondary and tertiary classification processes, the maximum fineness of the finished product can reach 3000 mesh.
The vertical mill is a special layer extrusion grinding equipment for calcium carbonate powder processing. Its structural design is highly compatible with the physical properties of calcium carbonate, and it can achieve efficient grinding through the extrusion force between the grinding rollers and the grinding disc. In the conventional processing mode, relying on the built-in classification system of the equipment, the fineness of the finished product can stably reach 1250 mesh, which can meet the filler needs of industries such as coatings and plastics. When combined with the secondary and tertiary classification processes, the maximum fineness of the finished product can reach 3000 mesh, which can accurately meet the application requirements of high-end fields such as high-grade papermaking and advanced composite materials.

How it works

The motor drives the grinding disc to rotate through the reducer. Calcium carbonate raw materials fall into the center of the grinding disc from the feed inlet, move toward the edge of the grinding disc under the action of centrifugal force, and are crushed by the strong rolling of the grinding rollers. The crushed calcium carbonate powder overflows from the edge of the grinding disc, and is then lifted by the high-speed upward hot air flow from the nozzle ring (air ring) and sent into the high-efficiency classifier integrated with the vertical mill for classification. Coarse powder is returned to the grinding disc for re-grinding after classification; fine powder is discharged from the mill along with the air flow and collected by the dust collection device as the finished product. Coarse calcium carbonate particles that are not lifted by the air flow and metal impurities that enter accidentally will settle at the air ring, be scraped out by the scraper, and then be sent back to the mill for reprocessing through the external circulation bucket elevator.

Performance and features

Strong Adaptability and Adjustable Fineness

The layer extrusion grinding structure of the vertical mill is highly compatible with the physical properties of calcium carbonate. The conventional processing fineness can reach 1250 mesh, and with multi-stage classification processes, the maximum fineness of the finished product can be increased to 3000 mesh, meeting the needs of different application scenarios.

Excellent Finished Product Quality and Low Oil Absorption Value

Calcium carbonate powder processed by the vertical mill has a uniform particle size distribution and its oil absorption value is much lower than that of products processed by traditional equipment. It can effectively improve the processing performance and finished product quality of downstream rubber, plastic and coating products, and reduce production costs.

Large-scale Processing with Controllable Costs

The vertical mill is suitable for large-volume continuous production. The processing energy consumption and labor cost per unit of powder are lower, and the advantages of large-scale production are significant, which can bring stable production capacity output and considerable economic benefits to enterprises.

High Integration and Compact Process

The vertical mill integrates grinding and classification functions, eliminating the need for additional independent classification equipment. The process flow is simpler, the equipment covers a small area, and it can reduce the difficulty of plant layout and initial infrastructure investment.

Relatively High Operation and Maintenance Costs

The equipment generates high noise during operation. Core components such as grinding rollers and grinding discs require regular inspection, repair and replacement, leading to relatively high long-term maintenance costs. Meanwhile, the initial construction investment of the complete set of equipment is large, which puts forward higher requirements for enterprise capital.

Technical Parameters

Model6008801000110013001500170018002000240026002800
Nominal diameter of grinding disc (mm)6008801000110013001500170018002000240026002800
Particle size of feed material (mm)＜10＜10＜10＜10＜10＜10＜10＜10＜10＜10＜10＜10
Moisture content of feed material (%)≤5≤5≤5≤5≤5≤5≤5≤5≤5≤5≤5≤5
Fineness of finished product5-22μm5-22μm5-22μm5-22μm5-22μm5-22μm5-22μm5-22μm5-22μm5-22μm5-22μm5-22μm
Output (t/h)1-62-83-124-145-167-188-209-2210-2520-4025-4530-50
Main motor power (kW)5516020025028035540045056080014001800

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