superfine grinding mill for processing kaolin

• Publication time：2025-08-07
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What is kaolin?

Kaolin has a fine and soft texture, is easily dispersed in water, has a density of approximately 2.6 g/cm³, a Mohs hardness of 2.0 - 2.5, is resistant to high temperatures with a melting point of about 1750℃. After calcination, its chemical properties are stable, and it also has low electrical conductivity, a low coefficient of expansion, and certain adsorptivity. However, the raw ore contains impurities and has a large particle size, so it requires deep processing. The Superfine grinding mill plays a crucial role in this process.

Kaolin for paper coating grade: Kaolin with a fineness of D97 ≤ 10μm can improve the gloss of paper, making printed products have bright colors and clear images, and enhancing the opacity and whiteness of paper.

Ceramic glaze: Ultra-fine kaolin powder (D90 ≤ 5μm) enhances the sintering uniformity of ceramics, reduces deformation and cracking, improves the product yield, improves the suspension and stability of the glaze, and enhances the texture and aesthetics of ceramics.

Functional filler: Surface-modified kaolin, as a functional filler, can enhance the mechanical properties of rubber, improve the strength and rigidity of plastics, improve dimensional stability, and also has good insulation properties.

Advantages of Superfine grinding mill in processing kaolin

Ultra-fine crushing ability: Through a multi-stage grinding and classification system, kaolin can be crushed to 1250 - 5000 mesh (about 2 - 45μm), meeting the needs of high-end industries.

Low-temperature grinding: Using the principle of laminating crushing, there is less grinding heat, avoiding damage to the crystal structure of kaolin and maintaining chemical stability.

Ensuring high purity and low pollution: The equipment is made of stainless steel or ceramic lining to reduce the mixing of iron impurities and ensure high whiteness.

Energy-saving and efficient: Compared with traditional ball mills, energy consumption can be reduced by 30% - 50%. The classification efficiency is high, avoiding over-crushing and improving production efficiency and product quality.

Automated control: It is easy to adjust the pressure of the grinding roller and the rotation speed of the classifier, precisely controlling the particle size distribution of the finished product and improving production efficiency.

Process flow of Superfine grinding mill in processing kaolin

Raw material pretreatment: The raw kaolin ore contains impurities and has a high moisture content. First, it is washed with water to remove soluble impurities such as sediment, then processes such as flotation and magnetic separation are used to remove metal impurities such as iron and titanium and other harmful impurities. Finally, it is dried to a moisture content of less than 5%.

Coarse crushing stage: The pretreated kaolin still has a large particle size and needs to be coarsely crushed to less than 10mm using a jaw crusher or hammer crusher.

Ring roller mill grinding: The coarsely crushed kaolin enters the ring roller mill and is crushed into fine powder under the action of extrusion and shear forces between the grinding ring and the grinding roller.

Classification system: An internal or external classifier is used. The powder is screened through a high-speed rotating impeller. Coarse powder returns to the mill for further grinding, and qualified fine powder enters the collection device, which can precisely control the fineness of the finished product.

Finished product collection: Qualified fine powder is collected through a cyclone separator and a bag filter, and finally packaged and stored for transportation to various industries.

Key points of Superfine grinding mill in processing kaolin

Finished product fineness: By adjusting factors such as the rotation speed of the classifier and the pressure of the grinding roller, it can be flexibly adjusted between 5 - 45μm (D97), meeting the needs of different industries.

Grinding roller pressure: Usually between 0.5 - 1.2MPa, it is adjusted according to the hardness of kaolin. When the hardness is high, increasing the pressure can improve the crushing efficiency, but too high a pressure will increase energy consumption and wear.

Classifier rotation speed: Generally between 800 - 3000rpm, adjusting the rotation speed can control the particle size distribution of the finished product, and stable operation of the rotation speed is crucial.

Summary

The Superfine grinding mill has obvious advantages in the field of kaolin processing. It can achieve fine processing of 2 - 45μm, has the advantages of low-temperature grinding, high purity, energy-saving, and automated control. The process flow includes pretreatment, coarse crushing, grinding, classification, and collection.