Vertical grinding mill processes calcium carbonate

• Publication time：2025-11-03
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Application of Calcium Carbonate Powder

Below 200 mesh

Used in feed additives to provide a calcium source for animals and improve eggshell quality; in building materials to enhance the physical properties of bricks; and as the main filler in putty powder to ensure smooth wall surfaces.

250–325 mesh

Used in the plastics industry to reduce production costs and improve product hardness; in the rubber industry to enhance wear resistance and anti-aging properties; in the coatings industry to improve coverage and filling capacity; and in the papermaking industry to increase whiteness and opacity.

400–600 mesh

Used as an abrasive in toothpaste to clean teeth; in high-end coatings to improve fineness and gloss; and in the production of cable sheathing to enhance insulation and mechanical strength.

Above 800 mesh

Used in high-quality coated paper to improve paper quality; in the pharmaceutical industry as an excipient or calcium supplement; in the food industry to adjust acidity and increase calcium content; and in PVC profiles to improve toughness and weather resistance.

Advantages of Vertical Grinding Mills for Processing Calcium Carbonate

Efficiency and Energy Balance

Utilizes a bed-grinding principle, achieving 30%–50% higher energy efficiency compared to ball mills.

Easy Adjustability of Fineness

By adjusting parameters such as classifier speed, roller pressure, and airflow, products ranging from 80 to 1250 mesh can be produced. For instance, increasing the classifier speed yields fine powder above 800 mesh for the papermaking industry, while lowering relevant parameters produces coarse powder below 200 mesh.

Excellent Dry Processing

The system operates under negative pressure with hot air for drying and transportation, ensuring a final product moisture content of ≤1%, meeting the stringent moisture requirements of high-end industries such as electronic materials.

Environmental Protection and Automation

Equipped with a PLC central control system, it allows remote monitoring and parameter adjustment, enabling automatic start-stop functions, reducing labor intensity, and improving production efficiency and stability. The system is well-sealed and equipped with high-efficiency pulse dust collectors, ensuring low dust emission concentrations and compliance with environmental standards.

Effective Control of Metal Wear

The minimal relative sliding between grinding rollers and the grinding disc results in lower metal wear compared to ball mills. While ball mills may experience wear of several kilograms or more per ton of product, vertical grinding mills can control metal wear to within a few hundred grams per ton, reducing maintenance costs and product quality risks.

Process Flow of Vertical Grinding Mills for Processing Calcium Carbonate

Crushing

Large calcium carbonate ore (≤30mm in size) is crushed into smaller particles by a jaw crusher, providing suitable raw material granularity for subsequent grinding and removing impurities to improve raw material purity.

Feeding  

Crushed materials are transported orderly into the grinding process via bucket elevators and vibrating feeders working together. The bucket elevator lifts materials to the raw material bin, while the vibrating feeder uniformly and quantitatively conveys materials into the mill.

Grinding and Drying

Materials fall onto the center of the rotating grinding disc and spread under centrifugal force to the area under the grinding rollers, where they are crushed by hydraulically pressurized rollers. Simultaneously, hot air introduced from the bottom of the host machine dries the materials, improving grinding efficiency and ensuring low moisture content.

Classification

The crushed and dried powder rises with the airflow to the classifier. The high-speed rotating turbine generates centrifugal force, throwing coarse particles to the periphery to fall back onto the grinding disc for regrinding, while qualified fine powder enters the dust collector with the airflow. Adjusting the turbine speed controls product fineness.

Collection and Packaging

The dust-laden airflow enters the pulse bag dust collector, where dust is intercepted on the outer surface of the filter bags, and clean gas is discharged. When the dust on the filter surface reaches a certain resistance, the pulse control system activates, causing the dust to fall into the hopper. It is then transported to the finished product silo via a conveying system and finally packaged as required.

Summary

The Cronus Vertical Grinding Mill is an ideal solution for achieving high-value applications of calcium carbonate across the entire range from coarse to ultra-fine powder, thanks to its comprehensive advantages in efficiency, energy savings, adjustable fineness, dry processing, and environmental automation.