Comparative analysis of performance of non-metallic mineral ultra-fine grinding equipment!

With the domestic non-metallic mineral products in the field of application development, Raymond, ring roller mill, ball mill grinding equipment and technologies adapted to the needs Band work index of non-metallic mineral products processing <15.0 to some extent.

Raymond Mill

It is suitable for non-metallic minerals with a Band work index <15.0. It is mainly used to produce coarse powder products with d97>28μm, and the scale of single machine is small. When grinding non-metallic minerals with a Mohs hardness of <3.0, the service life of consumables can reach 120 days; but when grinding non-metallic minerals such as quartz sand, pyrophyllite , kaolin and other Band work index >15.0, the wearing parts The service life can only reach about 20 days, the wear is serious, the wear is high, and the products are polluted, which affects the operation efficiency of the equipment and the economic benefits of the enterprise.

Raymond Mill

Ring roller mill

It is suitable for non-metallic minerals with a Band work index <15.0. It is mainly used to produce (super) fine powder products with d97=8-22μm, and the scale of single machine is small. The service life of consumables can reach 300 days; however, when grinding non-metallic minerals such as quartz sand, pyrophyllite, kaolin and other Band work index >15.0, the service life of wearing parts can only reach 30-60 days, and the wear is serious. High wear and pollution products will also affect the operational efficiency of the equipment and the economic benefits of the enterprise.

Ring roller mill

Ball mill

It is suitable for the non-metallic mineral grinding classification of Band work index <26.0. After matching with the classifier, it can produce coarse powder and fine powder products with d97=5-45μm. The service life of consumables such as lining and grinding media can reach 1000 days; but for non-metallic minerals with a Band work index of 26.0, the service life can only reach 100 days, and the wear of the lining and grinding media enters. In the product, it has a certain impact on the purity of the product and its performance. In order not to affect the operating efficiency of the equipment, it is necessary to regularly check and supplement the grinding media; the disadvantage is that the energy consumption is high.

Ball mill

However, for the processing of non-metallic mineral products with a Band work index >15.0, the above equipment technology still has the following problems:

The hardness of the material is high, causing serious wear of the wearing parts of the equipment;

The material has high abrasiveness and high abrasion, resulting in serious product pollution;

Frequent replacement of consumable parts, resulting in low efficiency of equipment operation, high maintenance rate, seriously affecting the economic benefits of enterprises

In response to the above problems, the eyes of domestic non-metallic mineral products manufacturers have turned to efficient and energy-saving vertical grinding equipment and technology. As one of the major advances in dry grinding and grading of non-metallic minerals in recent years, vertical mill equipment technology is characterized by strong material adaptability, adjustable product fineness, obvious scale benefits, high operating efficiency and single machine production capacity. The average electricity consumption of large and ton products is low, the purity of the products produced is high, the particle size distribution is narrow, and the fineness of the finished product is d97=10-44μm.

Vertical mill

It has strong adaptability to raw materials and is suitable for non-metallic mineral grinding classification of Band work index <26.0. The fineness of product can be adjusted arbitrarily between d97=10-80μm, and the scale of single machine is large. For non-metallic minerals such as calcite and talc with a Bond work index <15.0, the service life of consumables such as liners and sleeves can reach 1000 days; however, for non-metallic minerals with a Bond work index of 26.0, the wearing parts are used. The service life can only reach 80 days, and the worn parts of the sleeve and the liner will also enter the product, which will have certain influence on the purity of the product. In order not to affect the operation efficiency of the equipment, the roller sleeve and the disc liner should be inspected regularly, which is vulnerable. The parts are easy to repair and replace.

Guilin Hongcheng vertical mill

According to the above analysis, it can be seen that the Raymond mill and the ring roller mill are affected by the low service life of the wearing parts and the small scale of the single machine, which is limited in the processing of the non-metallic mineral powder; although the combination of the ball mill and the classifier can satisfy the scale production, The high energy consumption per ton of products seriously restricts the application of this equipment technology in the processing of non-metallic mineral powders. The eyes of non-metallic mining companies began to pay attention to high-efficiency and energy-saving vertical grinding equipment and technology. Vertical grinding is the main equipment of powder processing equipment technology in recent years, which not only meets the requirements of large-scale upgrading of non-metallic mineral industry, but also It meets the requirements of the national energy conservation and emission reduction policy.

(1) Application of vertical grinding in pyrophyllite grinding

A group company in Zhejiang uses vertical mills and Raymond mills to produce similar pyrophyllite products for comparison. For the production of similar products, the average power consumption per ton of vertical mill is 18.7% lower than that of Raymond Mill; the single machine capacity is 6 times that of Raymond Mill; the service life of wearing parts is 5-7 times that of Raymond Mill. Under the same production scale, the investment amount of the vertical mill is 6% higher than that of Raymond Mill, but its operation and maintenance cost is 56% lower than that of Raymond Mill.

Comparison of vertical mill and Raymond mill production of pyrophyllite powder

(2) Application of vertical grinding in kaolin grinding

The kaolin clay powder is prepared by a vertical mill, and the product has a narrow particle size distribution, large single machine production capacity, low average electric consumption per ton of product, high operation efficiency and low maintenance cost.

Production of kaolin powder products by vertical mill and analysis of power consumption

Conclusion

Non-metallic mineral processing equipment and technology is an important indicator to measure the level of development and utilization of non-metallic mineral resources in a country. During the “13th Five-Year Plan” period, equipment technology innovation and industrialization technology innovation are the focus of transformation and upgrading of non-metallic mineral powder industry, energy saving and high efficiency. It will be the focus of the development of grinding equipment.

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