Vertical Mill Production Process

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

Model	600	880	1000	1100	1300	1500	1700	1800	2000	2400	2600	2800
Nominal diameter of grinding disc (mm)	600	880	1000	1100	1300	1500	1700	1800	2000	2400	2600	2800
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 product	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm	5-22μm
Output (t/h)	1-6	2-8	3-12	4-14	5-16	7-18	8-20	9-22	10-25	20-40	25-45	30-50
Main motor power (kW)	55	160	200	250	280	355	400	450	560	800	1400	1800

Related Processes & equipment

Ball Mill + Air Classifier Production Process

The automatic ball milling and classification production line dedicated to calcium carbonate is an advanced integrated crushing and classification equipment developed specifically for the characteristics of calcium carbonate ore powder. Adopting a closed-circuit circulation system design, this production line boasts core advantages such as low energy consumption, high output, stable and efficient operation, mature and reliable technology, and precise control over the particle size of finished products. Its complete technological process includes key links such as two-stage crushing, fine grinding, precise classification, finished product packaging, silo storage, material conveying and vertical lifting. Multiple classifiers can be connected in parallel or in series at the rear end of the ball mill to realize the simultaneous production of calcium carbonate products with various particle size specifications.

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Ring Roller Mill Production Process

The ultra-fine grinding process of calcium carbonate by ring roller mill adopts an exclusive "multi-roller small-diameter" design. With precisely controlled fit clearance between the ring rollers and grinding rings, it can process calcium carbonate powder to an ultra-fine precision of up to 2500 mesh (about 5 microns). This process features lower energy consumption than traditional equipment and a low proportion of over-ground powder in the finished product, which ensures uniform particle size distribution and lower oil absorption value of calcium carbonate powder. It is suitable for processing calcium carbonate materials with a Mohs hardness below grade 5 and moderate fineness requirements.

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Raymond Mill Production Process

In the calcium carbonate industry, the Raymond mill is one of the earliest and most widely used grinding equipment in the world. Its conventionally processed calcium carbonate powder has relatively low fineness, which is mainly suitable for the large-scale production of ordinary calcium carbonate powder with a mesh size of over 400. With secondary classification, small batches of products with a mesh size of 500–1250 can be obtained, thus having the capability of large-scale production of coarse powder and small-batch production of fine powder.

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Preliminary Crushing

Grinding & Classification

Surface Modification

Preliminary Crushing

Grinding & Classification

Surface Modification

Vertical Mill Production Process

How it works

Performance and features

Strong Adaptability and Adjustable Fineness

Excellent Finished Product Quality and Low Oil Absorption Value

Large-scale Processing with Controllable Costs

High Integration and Compact Process

Relatively High Operation and Maintenance Costs

Technical Parameters

Related Processes & equipment

Ball Mill + Air Classifier Production Process

Ring Roller Mill Production Process

Raymond Mill Production Process