Energy-Efficient Technologies in Cement Grinding

Cement is an energy-intensive industry in which the grinding circuits use more than 60 % of the total electrical energy consumed and account for most of the manufacturing cost. The requirements for the cement industry in the future are to reduce the use of energy in grinding and the emission of CO2 from the kilns. In recent years, the production of composite cements has been increasing for reasons concerned with process economics, energy reduction, ecology, conservation of resources and product quality/diversity. The most important properties of cement, such as strength and workability, are affected by its specific surface and by the fineness and width of the particle-size distribution. These can be modified to some extent by the equipment used in the grinding circuit, including its configuration and control.

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Performance of grinding circuits has been improved in recent years by the development of machinery such as high-pressure grinding rolls, Horomills, high-efficiency classifiers and vertical roller mills (VRM) for clinker grinding which are more energy efficient than machinery which has been in common use for many years such as tube mills. Energy-efficient equipments such as high-pressure grinding rolls, vertical roller mills, CKP pre-grinders, CHAENG is used at both finish grinding of cement and raw material-grinding stages due to higher energy consumption of conventional multi-compartment ball milling circuits. 
1. With high stability, won a number of new patents: Double-sliding-belt tube mill of CHAENG is the first one in China to solve the problem that grinding mills cannot continuously work due to the high temperature of sliding-belt shaft bush at the discharge end, and won national patent for utility models with patent No.: ZL201020285841.9. Many examples prove that CHAENG cement ball mill can run steadily for a long time.
2. Novel structure, strong production capacity: CHAENG cement mill adopts the latest and unique streamline design of the world, to reduce the ventilation resistance, increase the effective volume, make discharge easy, and improve the output of the mill. Lining plate in the mill adopts combined structure design, and different lining plate structures are used in different stages of raw material mill, so that the grinding efficiency is improved greatly. Its material drying capacity can reach 10%~15%.
3. Specific surface area of finished product is 3300-3800cm²/g: Specific surface area of the cement produced by CHAENG cement mill is 3300-3800cm²/g. Compared with other mills in the same industry, CHAENG cement mill has advantages of high-fineness product, larger specific surface area,quick hydration reaction, and fast strength development.