Raymond mill processes bentonite

• Publication time：2025-07-07
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What is bentonite?

Bentonite has montmorillonite as its main component, a unique layered structure, and properties such as water absorption, suspension, and adhesion.

Water absorption: It expands in volume after absorbing water and forms a gel - like substance.

Suspension: It forms a stable suspension after being dispersed in water.

Adhesion: It generates high adhesive strength after drying.

Cation exchangeability: Interlayer cations (such as Na⁺, Ca²⁺, etc.) can be replaced by other ions.

Thixotropy: Under the action of external force (such as stirring), it changes from a gel state to a sol state and returns to the original state after standing.

Application of Raymond Mill in Processing Bentonite

The Raymond mill is a key device for processing bentonite. The grinding fineness ranges from 80 - 400 mesh, and some improved models can reach over 600 mesh, which can meet the needs of different industries for bentonite.

80 - 200 mesh: Used for casting sand molds and iron ore pellets.

200 - 325 mesh: Used for drilling mud, sewage treatment, and feed additives.

325 - 600 mesh: Although the production capacity decreases by 20 - 30%, it can ensure the quality. It is used in cosmetics, coatings, and as raw materials for organic bentonite.

Process of Raymond Mill Processing Bentonite

Raw material pretreatment: The particle size of the raw ore needs to be crushed to ≤30mm. Commonly used crushers are jaw crushers or hammer crushers. If the moisture content is >10%, it is easy to block the equipment, and it can be dried naturally or by a dryer.

Grinding process: The main machine, classifier, cyclone collector, and bag dust collector work together. Inside the main machine, the grinding roller rolls the bentonite. The grinding roller and grinding ring are made of high - manganese steel or wear - resistant alloy materials. The classifier controls the fineness, and the operator can adjust the rotation speed. Qualified fine powder is collected by the cyclone collector and bag dust collector in a double - collection manner.

Optional modification process: After grinding, modification equipment can be connected in series. To produce organic bentonite, organic substances such as quaternary ammonium salts are added for organic modification, which is used in fields such as paints and inks. To produce activated bentonite, acid activation is carried out, which is used in fields such as oil decolorization.

Key Points of Raymond Mill Processing Bentonite

Adhesion problem: Bentonite has strong water absorption and is easy to adhere to equipment components, resulting in poor material flow and equipment blockage. The moisture content of the incoming material can be controlled to <8%, the grinding chamber can be heated (temperature ≤60℃), and the inner wall of the mill can be cleaned regularly.

Fineness control: Sodium - based bentonite is easier to grind fine than calcium - based bentonite. The rotation speed of the classifier can be adjusted dynamically. For the production of super - fine powder (>600 mesh), it is recommended to adopt a two - stage crushing process of "Raymond mill + air - flow mill".

Impact of impurities: Impurities such as quartz sand accelerate the wear of the grinding roller. Screening or magnetic separation can be carried out in advance to remove impurities.

Summary

Raymond mill is the core equipment for processing bentonite.processes bentonite through processes such as crushing, grinding, classification, and collection, and can also carry out modification processes. During processing, the adhesion problem needs to be controlled.

Click on the picture to learn about the details of the CRRM Raymond Mill