Is it necessary for cement mills and clinker mills in cement factories to use vertical mills or ball mills?
2021-05-24
The energy consumption rate of cement ball mills is low, and there is a tendency to be replaced by cement vertical mills, roller presses and other equipment. In addition, cement ball mill processing is not environmentally friendly with vertical mills, and it occupies much larger area than vertical mills.
Disadvantages of cement vertical cement mills compared to cement ball mills:
- 1. High initial investment costs in equipment and civil engineering, the cement vertical mill foundation is much higher than the cement ball mill foundation.
- 2. The technical difficulty of operation, maintenance and management is relatively great.
- 3. Compared with the vertical mill, the particle size distribution of the cement ball mill is more rational.
- 4. Although the technical indicators of domestic cement vertical mills have reached the level of foreign products, the main technology is still in the hands of foreign manufacturers, and the details, reliability and stability of the supporting equipment have not been brought up to date. .
Advantages of vertical cement mills compared to cement ball mills:
However, compared to these drawbacks, the advantages of vertical mills are not comparable to those of ball mills.
1.Vertical mill has better grinding effect and lower cost in later stage
Although the investment of the vertical mill is relatively high, the crushing effect is good, and the operating cost and maintenance cost of the equipment are continuously reduced due to the development of vertical mill technology and the continuous progress of the mill industry.
2.Vertical mills are widely used in the field of large-scale grinding
Vertical mills are ideal large-scale crushers widely used in cement, electrical, metallurgy, chemical, non-metallic mining and other industries. It integrates crushing, drying, crushing, sorting and conveying to achieve high production efficiency and can crush bulk, granular and powder materials into the necessary powder materials.
3.Vertical mill does not require grinding media
Vertical mills do not need to be crushed with a crusher, so they are crushed without contact with crushing rollers, which greatly improves production efficiency, reduces energy consumption, and significantly increases production and maintenance costs. Reduce Cement production line and ultrafine mineral powder production line. The ideal choice. Vertical mills use the material bed grinding principle to grind materials and overcome many flaws in the ball mill grinding mechanism. It achieves high crushing efficiency, low energy consumption (20% to 30% less energy than ball mills) and large-scale drying. The shredded material has a large capacity and can be loaded. The crushed material has large particle size, simple crushing process, small installation area, low civil engineering cost, low noise, low wear, long service life, and easy operation. has the advantage of being.
4. Large feed size of vertical mill
The particle size of the material supplied to the vertical mill is large, generally 3% to 5% of the diameter of the grinding roll. Large particle sizes are possible in large mills. Therefore, large and medium vertical mills can eliminate the need for a secondary grind. Ball mills are limited by their maximum diameter of steel balls and can only supply smaller raw materials.
Cement vertical mills are not suitable for grinding hard and abrasive materials, and have a short service life and frequent maintenance. Moreover, its wear parts are more expensive than ball mills, but compared with the total maintenance of the ball mills, elevators, powder separators and other equipment it replaces, it still appears simple, easy to maintain and has a small workload.