Raymond mill processes rare earths

• Publication time：2025-07-29
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Rare Earths and Raymond Mill

There are many types of rare earth ores, such as bastnasite, monazite, ion-adsorbed rare earth ores, etc. Their physical and chemical properties vary greatly. Hardness and cleavage characteristics affect powder grinding. Ores with high hardness require greater grinding force, and cleavage affects the crushing method and particle size distribution. Moreover, rare earth ores are often associated with radioactive elements. During powder grinding, it is necessary to protect the health of workers, prevent environmental pollution, and avoid over-grinding, which increases energy consumption and the difficulty of mineral processing.

Raymond mill is used to process rare earths, and its fineness can meet the requirements of preliminary dissociation or subsequent leaching of rare earth ores. It has a built-in hot air system that can dry rare earth ores with low moisture content. Hard minerals in rare earth ores accelerate the wear of grinding rollers and grinding rings, so wear-resistant materials are needed. When processing rare earth ores containing radioactive minerals, the equipment needs to be enclosed and equipped with an efficient dust removal and protection system.

The Process of Processing Rare Earths with Raymond Mill

The Raymond mill consists of a main machine, an analyzer, a fan, etc. The main machine contains key components such as grinding rollers and grinding rings. It is based on the extrusion and grinding of the grinding roller and the grinding ring. Materials enter the main machine through the feeding device. The grinding roller presses against the grinding ring under the action of centrifugal force. The shovel blade scatters the materials, and the materials are crushed. The air flow of the fan blows the ground materials into the analyzer. Fine powder enters the finished product cyclone separator for collection through the analyzer, and coarse powder returns to the main machine for further grinding. The fineness and output of the finished product are controlled by adjusting the rotation speed of the analyzer and the air volume of the fan.

Pretreatment Step: The raw rare earth ore needs to be crushed to ≤30mm. Jaw crushers and cone crushers are commonly used. For ion-adsorbed ores, over-grinding should be avoided. Gentle crushing methods should be adopted and the degree should be strictly controlled.

Parameter Adjustment Skills: The rotation speed of the classifier controls the fineness of the finished product. To produce fine powder, the rotation speed needs to be increased. For rare earth ores with high humidity, more hot air drying is required, but attention should be paid to controlling the temperature to avoid affecting the chemical properties of rare earths.

Introduction to the Supporting Process: After powder grinding, the rare earth powder needs subsequent processes for extraction and separation. Magnetic separation is used to remove magnetic impurities, flotation is used to improve the recovery rate of fine-grained disseminated rare earth ores, and the acid leaching method is commonly used for ion-adsorbed rare earth ores.

Key Points of Processing Rare Earths with Raymond Mill

Environmental Protection and Compliance Requirements: Equip with a high-efficiency pulse dust collector to control dust emissions, establish a radioactive wastewater treatment system, and use a variety of technologies to purify the wastewater.

Wear Resistance Optimization Measures: Regularly check the wear of the grinding roller and the grinding ring. Use surfacing repair or select tungsten carbide coatings to improve wear resistance.

Process Adaptation Key Points: Adjust the powder grinding fineness according to the type of rare earth ore to avoid sludging affecting subsequent processes.

Summary

The Cronus Raymond mill has significant advantages in rare earth processing. When applying it to rare earth processing, all links need to be grasped, environmental protection and wear resistance requirements need to be implemented, and the process needs to be adapted to achieve efficient and green development of rare earths.