Analysis on the application progress of vertical mill in non-metallic mineral industry

1, the frontier

At present, China has proven non-metallic mineral species to 91 species, of which fluorite, talc, asbestos, gypsum, barite, wollastonite, bentonite and other mineral proven reserves in the world, calcite, marble, flower The reserves such as granite are quite abundant. However, the distribution of non-metallic minerals is very uneven.

Prior to the application of non-metallic minerals, it is usually necessary to grind the powder into powder, and the application requirements of different applications vary greatly. This article ignores the quality and functional treatment of raw ore, and discusses the application progress of vertical grinding in the industries of pyrophyllite, heavy calcium and bentonite by improving or improving the product index (yield and fineness) of non-metallic mineral powder.

2, vertical mill introduction

The vertical grinding technology originated in Germany in the 1920s. Its extensive application, economy and stability have been proved by industrial practice and it is one of the first energy-saving equipments in the field of grinding. Hefei Cement Research and Design Institute Zhongya Equipment Co., Ltd. successfully developed HRM vertical mills in the 1980s. After nearly 30 years of development, HRM vertical mills are widely used in cement, metallurgy, electric power and non-mine industries. A range of product specifications.

As the diversity of non-metallic mineral products industry requirements, such as the refinement of the special nature of its product requirements than the cement raw material, coal powder metallurgy, electric power desulfurization powder is much higher, which will be needed for the original vertical mill equipment innovation design. The schematic diagram of the ultra-fine vertical mill (two rolls/three rolls) for non-metal ore is shown in Figure 1.

Figure 1 Schematic diagram of HRM1700X ultra-fine vertical mill structure

3, vertical grinding grinding process

The process and schematic diagram of HRM vertical grinding non-metal ore grinding process are shown in Figure 2.

Figure 2 HRM vertical grinding non-metallic ore grinding process and schematic diagram

Vertical mill grinding of different non-metallic minerals, the process is basically the same, the core of the process is the rational selection of equipment, and this depends mainly on the characteristics of raw materials, fineness of finished products and production indicators. For different materials, the vertical mill model, installed power, grinding disc speed and separator design are different. The main fan, dust collector and hot blast stove also need to pass the heat balance calculation, and then use the project experience to rationally select the type. The system process is a guarantee of product specifications (yield and fineness).

In short, the characteristics of vertical mill grinding can be summarized as: automatic quantitative feeding, material bed grinding, adjustable grinding pressure, high efficiency of powder selection, wide range of fineness adjustment, high single machine capacity, grinding loss (power consumption and Wear is low).

4. Application progress

4.1 Pyrophyllite industry

The main chemical components of glass fiber are SiO2, Al2O3, CaO, etc. The raw material for introducing these components is mainly pyrophyllite (English name: Pyrophyllite). China's pyrophyllite is rich in reserves and has good resource advantages. The factors restricting the development of the glass fiber industry are mainly concentrated on the processing of pyrophyllite raw materials.

4.2 Heavy calcium industry

Heavy calcium carbonate (referred to as heavy calcium, GCC) is made of natural carbonate minerals such as calcite, marble and limestone . It is a typical energy-saving and environmentally friendly mineral filling material in papermaking, coatings, plastics and rubber. It is widely used in fields such as paints.

There are mainly domestic heavy calcium industry formats: (1) serious resource abuse behaviors, such as “small, scattered, chaotic” and so on; (2) extensive processing of resources, low level of deep processing, high value-added utilization of high-quality resources, resources Serious waste; (3) problems such as high-quality raw ore resources or serious foreign transportation of products.

4.3 Bentonite industry

Bentonite (English name: Bentonite), also known as: bentonite, bentonite, Guanyin soil, its chemical composition is quite stable, known as "universal stone."

It is a hydrous clay mineral with montmorillonite as its main component. It has good adhesion, swelling, adsorption, plasticity, dispersibility, lubricity and cation exchange. It can be widely used in various binders and suspensions. Agents, adsorbents, decolorizers, plasticizers, catalysts, bentonites , disinfectants, thickeners, detergents, detergents, fillers, reinforcing agents, etc.

4.4 Other non-mine industries

In addition to the above areas industry, vertical mill HRM involved in further comprising: kaolin, talc, quartz sand, shale, manganese ore.

5 Conclusion

Non-metallic mineral resources are an important material basis for human survival and economic development, a valuable natural resource for the country, and a strategic resource for the future. Because of its non-renewability and scarcity, rational development and scientific utilization are the responsibility of every industrial person, so that it can make the best use of it, thereby enhancing the cohesiveness and competitiveness of non-mineral industries, and transforming these advantages into China's economic development and the country. The strategic advantage of security.

The fluorinated mica crystals have very good high temperature resistance, corrosion resistance and light transmission properties, and can work for a long time at a high temperature of 1100°C.