The primary closed-circuit process of the vertical mill for cement preparation is mainly divided into two parts: the grinding functional area and the stirring functional area. The grinding function area mainly realizes the separation and grinding of cement clinker and mixture. The mixed functional area mainly realizes the synthesis and configuration of various types of cement according to different product standards.
Vertical mill forms a closed-circuit grinding system in the grinding body. Because the operating parameters of the cement vertical mill are different from those of the raw meal grinding, problems such as unreasonable cement particle composition, less fine powder, low early cement strength and serious bleeding are prone to occur. Furthermore, cement components are more difficult to grind than raw meal. The grinding rollers and grinding discs are severely worn.
Therefore, the cement vertical mill has high requirements on the material of the equipment. Difficulty in operation and maintenance. The structure of the classification device needs to be improved. Our company’s vertical mill final grinding system is used for cement grinding. It is actually a process line that grinds clinker and slag separately, and then synthesizes cement. In this way, the problem that the particle distribution of cement multi-components is not easy to control during the air separation process is avoided. This guarantees the quality of cement.
Since the mid-1990s, with the development of new wear-resistant materials and the continuous improvement of vertical mill technology, developed countries such as Germany and Japan have taken the lead in adopting vertical mill slag, and have achieved success. Compared with other grinding systems, the slag vertical mill process integrates drying, grinding and powder selection. The process has the advantages of simple system and high unit output. For grinding high-moisture materials, it is not only possible to set up drying equipment. Therefore, the investment and operation and maintenance costs of the system are low. High operational reliability. Grinding energy consumption is low. The unit power consumption of grinding slag powder with a specific surface area of ??420m2/kg is about 40-45kWh/t. And the particle shape of the milled product is superior to that produced by other milling systems. Therefore, under the same specific surface area, the product performance is better. More than ten years of use show that the vertical mill slag grinding process is a mature and advanced slag grinding technology.