Grinding is an important technical link in the production of cement, as it not only determines the unit electricity consumption of cement production, but has great influences on the performance of cement. For a long time, cement grinding is completed inside ball mill as it has the features of simple structure, reliable operation, convenient maintenance and management, strong adaptability for the materials, continuous production, big production capacity, big grinding ratio and easy control of the fineness of the final products. However, the effective energy availability is only 2%-5%, and the majority of the rest energy is changed into heat energy, and the economic benefits are not optimal. In recent years, traditional grinding mill is improved and updated, and new type of powder separation closed-circuit system is adopted and the cement grinding technology is developing rapidly. Especially the application of vertical mill greatly reduces the energy consumption of grinding slag cement and improves the grinding efficiency.
Dingli vertical mill is integrated with tertiary crushing, drying, grinding, powder separation and conveying and is the best choice for processing slag and cement. Then compared with ball mill, what are the advantages of vertical mill.
1. High powder grinding efficiency.
Vertical mill adopts material bed grinding principle to grind the materials, so that the grinding efficiency is improved by 30% than that of ball mill.
2. The technical process is simple and saves infrastructure investment.
Vertical mill has a separating machine, and uses hot smoke to convey the materials, so that no powder separating machine and elevating machine are needed. The gas containing dust will directly go into the powder collector for collection, so that the grinding system is simple, the failure rate is low, running rate is high.
3. Strong drying capacity.
Vertical mill adopts hot air to convey materials, and when grinding materials with high water content, the inlet air temperature can be controlled to make sure that the products will reach the final water content. Vertical mill can dry the materials with the water content 12-15%.
4. Small abrasion of the metal.
In the running process of vertical mill, no metal materials directly contact with each other, so that the abrasion is small, and the unit abrasion consumption for limestone is generally 4-6 g/t.
5. Low noise and little powder dust.
In the working process of vertical mill, the grinding sound is soft, often about 80 db. The grinding roll and the grinding disk does not contact with each other. Vertical mill adopts integrated sealing, and the system works under negative pressure, so the powder dust is little.
6. Even final products.
The qualified products inside the vertical mill can be timely discharged, thus avoiding over grinding and the product granularity is even.
