Ultrafine grinding mill processing gangue

• Publication time：2025-08-20
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Advantages of Ultra-fine Grinding Mill in Processing Coal Gangue

Stable Operation

After years of development, ultra-fine grinding mills feature mature technology, reasonable structural design, optimized key components, and high reliability. They can achieve continuous and stable operation, meeting the needs of large-scale production.

Low Energy Consumption

Adopting the principle of material layer grinding, it has high energy utilization efficiency. Compared with ball mills, its energy consumption is reduced by 30% - 50%, saving operating costs and reducing carbon emissions.

Controllable Fineness

By adjusting the rotational speed of the classifier, the fineness of the product can be controlled within the range of 80 - 400 meshes, adapting to the diversified market demands.

Good Environmental Performance

A closed system is adopted to reduce dust emission, and it is equipped with a high-efficiency pulse bag filter to ensure that dust emissions meet the standards, establishing a good environmental protection image for the enterprise.

Process of Coal Gangue Processing with Ultra-fine Grinding Mill

Pretreatment

Crush coal gangue to a particle size below 30mm using a jaw crusher for coarse crushing; remove iron impurities with a permanent magnet drum or a suspended iron remover; dry the material to reduce moisture to below 6% using a rotary dryer or vertical dryer; sometimes medium crushing is also required, using a hammer crusher or roll crusher to reduce the material particle size to about 20mm.

Grinding

For medium-scale production with product fineness of 100 - 400 meshes, a large Raymond mill is selected; for large-scale production with high hardness of coal gangue, a vertical mill is chosen. Wear-resistant materials such as high-chromium alloy, high manganese steel, or wear-resistant alloy steel are used for the grinding rolls and rings.

Classification and Collection

A high-precision turbine classifier controls the product fineness, and a multi-stage classification system meets the needs of high-end markets; a pulse bag filter collects the powder with a dust collection efficiency of over 99%.

Packaging

The powder is sent to the finished product warehouse through a screw conveyor and elevator. Ton bag packaging machines are used for large-size packaging, bag packaging machines for small-size packaging, and stackers are used for stacking to facilitate storage and transportation.

Key Points in Coal Gangue Processing with Ultra-fine Grinding Mill

Hardness Difference

Coal gangue contains clay minerals, sandstone, carbonate rocks, etc., with a large range of Mohs hardness, resulting in uneven wear, severe wear of vulnerable parts, increased maintenance costs and downtime.

Impurity Treatment

Hard impurities such as metals and pyrite can scratch and wear key components of the mill, reduce grinding efficiency, affect product quality, and even cause the mill to stop. Therefore, it is necessary to remove impurities with an iron remover before grinding.

Fineness Requirements

Different fields have different requirements for the fineness of coal gangue powder. The efficiency of traditional ring roller mills decreases and energy consumption increases when processing ultra-fine powder.

Improvement and Upgrade

New wear-resistant materials such as ceramic composites extend the service life of grinding rolls and rings. Optimization of the air system improves fan efficiency and sorting accuracy, reducing energy consumption. Intelligent control technology realizes real-time monitoring and automatic adjustment, improving the stability and reliability of the equipment.

Summary

Ultra-fine grinding mills are key equipment for coal gangue processing and utilization, and perform excellently in processing within the medium and low fineness range. Successful application requires strict pretreatment, reasonable selection, use of wear-resistant materials, and systematic process design.