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Application of vertical mill in the production of ultra-fine products of non-metallic minerals


From:未知    Date:2021-04-27 17:48

In the development of the application field of non-metallic mineral products, the grinding equipment such as Raymond mill, ring roller mill, ball mill, etc., has the following problems for the processing of non-metallic minerals with a Bond work index> 15.0:
1. The hardness of the material is high, which causes the equipment to be easily damaged. The parts are severely worn;
2. The material is highly abrasive and the abrasion is high, which causes serious product pollution;
3. The frequent replacement of wearing parts causes low equipment operation efficiency and high maintenance rate, which seriously affects the economic benefits of the enterprise;

In response to these problems, a high-efficiency and energy-saving vertical mill has been studied. As one of the main advances in non-metallic mineral dry grinding and classification technology, it is characterized by large single-machine production capacity, low average power consumption per ton of product, and product has high  purity, narrow particle size distribution, high fineness of the finished product.
 

Application of non-metallic minerals in material processing

Non-metallic minerals are widely used in various industrial fields, especially after being ground into powder by grinding equipment. Involving electronics and electrical engineering, building materials, heat and fire insulation materials, chemical industry, ceramics, energy, metallurgy, biology and agriculture, it can be said to cover all aspects of human life. Let's briefly talk about the application in plastics, cement and construction.

non-metallic mineral products

1. Application of powder materials in plastic processing

Non-metallic minerals are ground into powder through a vertical mill, and powder materials are used as plastic raw materials, which can save petroleum resources and energy, reduce the raw material cost of plastic products, improve the market competitiveness of plastic products, and make certain properties of plastic materials as expected The direction has been improved and improved.

The powder can also be modified to give plastic materials new functions, which is unmatched by other polymer materials. Plastics modified by non-metallic mineral powder materials are more easily absorbed by the environment and are more environmentally friendly.

When processing plastics, the most commonly used non-metallic mineral powder: calcium carbonate (to improve rigidity and heat resistance), talc (to reduce wear), kaolin (to enhance heat preservation).

2. Application of powder materials in cement processing

As the main building material, cement has always been in great demand. Non-metallic minerals can be used in the production of special cement, such as the anti-corrosion cement and acid-resistant cement currently produced.

3. Application of powder materials in architectural ceramics

In the production of building ceramics, most of the raw materials are natural minerals. However, with the development of technology, the development of the ceramic industry tends to "low temperature and fast burning", which inevitably upgrades the processing of raw materials. The raw materials can be ultra-finely ground. The ultra-fine powder material has a high specific surface area and high surface activity, which can reduce the sintering temperature.

Through powder modification technology, powder materials with antibacterial and gas purification effects can be obtained, thereby producing architectural ceramics with antibacterial and purification functions.
 

Factors affecting the whiteness of non-metallic mineral products

Whiteness refers to the degree of whiteness on the surface of a substance, expressed as a percentage of the white content. The whiteness of non-metallic mineral powder is divided into dry whiteness and wet whiteness. Dry whiteness reflects the apparent whiteness of non-metallic mineral powder; wet whiteness is the reduction of non-metallic mineral powder in oily medium. The degree of whiteness after the original ore hue. When the dry whiteness and fineness of talcum powder are close, the powder with larger wet whiteness will produce brighter granules.
 
Whiteness is one of the important indicators for evaluating the quality of non-metallic mineral products such as quartz, kaolin, talc, and calcium carbonate. The main factors affecting the whiteness of non-metallic mineral products can be analyzed from the following three aspects:

 

01. Ore source

Because the non-mineral products of different mining areas contain different trace elements, the hue of the ore itself is different, and the corresponding dry whiteness will also be different.


02. Particle size

The particle size of the powder only affects the dry whiteness. Generally, the finer the particle size of the ore, the higher the corresponding whiteness value. In the past machining process, the finer the particle size, the more difficult the machining, the low work efficiency and the increase in production costs. But CLUM ultrafine vertical mill has high efficiency and low energy consumption:
• Grinding roller grinds the materials directly. Its energy consumption is 10% lower than other types roller mill and 25-60%.
• The grinding roller is not in contact with the grinding disc, and the special wear-resistant alloy material is used to prolong the service life of the mill and reduce the cost of easily worn parts.
• The automatic control system can operate the machine remotely, saving labor.

And the finished product of CLUM ultrafine vertical mill has advantages of high content of fine powder, high whiteness and more compact granularity.The fineness can reach 3000 mesh.
Fineness of finished products can be adjusted flexibly. Primary powder production can reach D97=10μm-20μm while the next powder separation attains D97=4-5μm easily.


03. Moisture content

Ore water content is one of the main factors affecting the whiteness value. Generally, powders with higher water content have dark whiteness. Appropriately reducing the water content of the ore can effectively improve the whiteness of the powder. Therefore, in ore processing, scientific and effective methods must be used to reduce the water content of the ore. Only in this way can the processed ore have a higher dry whiteness and wet whiteness.

CLUM ultrafine vertical mill has a strong drying capacity, which can grind, dry and grind raw materials with a moisture content of up to 15%.
 

Application of CLUM ultrafine vertical mill in the production of non-metallic mineral ultra-fine products

The industrial scale of the non-metallic mineral powder processing industry and the degree of product refinement have become one of the important indicators to measure the development level of a country's non-metallic mineral industry, and large-scale high-efficiency energy-saving equipment and advanced production and processing technology are the realization of non-metallic mineral The powder processing industry is the key to the development of large-scale and refined products.

As one of the main advances in non-metallic mineral powder dry ultra-fine processing technology, vertical mill equipment and technology have gradually emerged in the practice and application of non-metallic mineral industry scale and product refinement with the advantages of high efficiency, energy saving, and environmental protection. And it has promoted the development of large-scale and refined products in the non-metallic mineral industry.

Practice has shown that the white non-metallic mineral products produced by the vertical mill have high whiteness, good purity, narrow particle size distribution, and the power consumption and abrasion of the vertical mill are much less than that of the ball mill. It is a high-efficiency and energy-saving powder processing equipment.

CLUM Ultrafine Vertical Mill is widely used in large-scale ultrafine dry powder processing of non-metallic minerals such as calcite, marble, limestone, dolomite, barite, talc, kaolin, dolomite, wollastonite, gypsum, feldspar, and pyrophyllite.
Especially in the field of ultrafine grinding and processing of white non-metallic minerals, it has excellent performance, and can provide high-quality fillers and additives for papermaking, coatings, plastics, rubber, PVC, ink and other industries.

ultrafine vertical mill

Capacity: 0.2-45 t/h
Max feeding size: 30mm
Processing ability: 0.2-45 t/h
Fineness of finished product: 325-3000 meshes

CLUM ultrafine vertical mill

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