Adjustable Particle Size Vertical Roller Mill - Efficient Energy-Saving Limestone Vertical Mill

Description

Vertical mill is a grinding equipment that integrates fine crushing, drying, grinding, powder selection, and conveying. It is widely used for the grinding and ultra fine crushing of various solid materials in industries such as cement, building materials, power, metallurgy, chemical, non-metallic minerals, etc.

The grinding process of a vertical mill is completed by a set of grinding devices (i.e. rollers and discs), where the material is ground into powder between the rollers and discs. The movement of the grinding device is driven by the rotation of the grinding disc and the corresponding transmission of the grinding roller. In addition to the weight of the grinding roller, the grinding pressure mainly relies on a set of hydraulic devices to pressurize the material of the grinding disc. After grinding, there is a large amount of coarse powder in the material. The powder is selected by a matching powder selection machine, and the powder selection process is through air flow sorting. During the air flow process, most of the coarse powder automatically falls onto the grinding disc and is received for re grinding. The rest is selected as finished products by the powder selection machine and sent to the finished product storage warehouse through the dust collection and transportation system.
The residence time of materials on the grinding disc is mainly determined by three factors: first, the grinding disc speed that affects the magnitude of centrifugal force; The second is the frictional force between the material and the grinding disc, as well as the internal frictional force of the material itself; The third factor is the structural form and coordination between the grinding disc and the grinding roller, which determines the motion travel mode. The third factor is the key to determining the design ideas of each vertical mill manufacturer. Different forms of grinding rollers and discs determine the speed of the grinding discs and the residence time of materials on the grinding discs of each manufacturer. When selecting a vertical mill, users must choose a suitable one based on the characteristics of the grinding material.

Limestone Vertical Mill Working principle:

The electric motor drives the grinding disc to rotate through the reducer, and the material falls into the center of the grinding disc from the feeding port. At the same time, hot air enters the grinding chamber from the inlet. Under the action of centrifugal force, the material moves towards the edge of the grinding disc and is crushed by the grinding roller when passing through the circular groove on the grinding disc. The crushed material is carried up by the high-speed airflow at the wind ring at the edge of the grinding disc, and large particles directly fall onto the grinding disc for re grinding. When the material in the airflow passes through the dynamic and static separator, under the action of the rotating rotor, the coarse powder falls onto the grinding disc for re grinding, and the qualified fine powder is discharged with the airflow, Collecting in the powder collection device is the product. Materials containing moisture are dried during contact with hot gases to achieve the required product moisture.

Technical Data

Re:The data based on Mohs'hardness 3-4 material

Limestone Bond Index≤13kwh/t

Performance characteristics of limestone vertical mill
1. The system is simple, easy to operate and adjust, and has a high degree of automation. It is suitable for large-scale and ultra large scale industrial production, as well as small and medium-sized production.
2. High grinding efficiency and large energy-saving range. Compared with the ball mill system, it can save 30-50% electricity; Compared with traditional vertical mills, the proportion of external circulation is large, which can reduce system power consumption by about 20%.
3. The product has a high proportion of fineness, high manufacturing accuracy of the powder selection machine, and high powder selection efficiency, making it more suitable for the production of ultrafine powders.
4. Low wear and low steel consumption.

The disc does not directly contact the grinding roller, and the disc lining and roller surface are made of high wear-resistant materials, with a long service life.

5. Reliable operation and convenient maintenance. When repairing the grinding rollers, the machine body can be flipped out. For a large machine with four grinding rollers, when one or two symmetrical grinding rollers are being repaired, the other two symmetrical grinding rollers can be used to operate, which can reach 60-70% of the normal production capacity without affecting or minimizing the entire production line.

6. The equipment has a high cost performance ratio and saves investment. The system configuration is simple and can be arranged outdoors, without the need for a factory building, thus saving civil engineering costs.

7. Low vibration, low noise, and no dust during negative pressure operation.

Application scope of vertical roller mill
1. In the cement industry, it is suitable for grinding cement raw materials, coal powder, and cement clinker.
2. In the building materials and metallurgical industries, it is suitable for grinding high fine slag powder and high fine steel slag powder.
3. In thermal power plants, it is suitable for the preparation of coal powder and the preparation of desulfurization agent limestone powder.
4. In industries such as metallurgy, chemical industry, and mining, it is suitable for grinding various ores and other industrial solid materials, and the product fineness can be controlled between 100-1250 mesh (147-10um).