As we all know, the cement production can generally be divided into three processes: raw material preparation, clinker production and finished cement production. The cement grinding plant is a vital link of the finished cement production. The cement grinding plant also called cement grinding unit, is used to grind clinker into qualified cement. With the development of the cement industry, cement grinding plant becomes more common. As an individual section of finished cement production, at this stage, mixing the calcined clinker and mixed materials in a certain proportion, and then grinding to the required particle size to obtain the finished cement product we need.
The production process of silicate cement is representative of cement production. It is made of limestone and clay. It is crushed, compounded and ground to make raw materials, then fed into the cement rotary kiln to calcine the cement clinker, and then, adding the appropriate amount of gypsum (sometimes mixed with mixed materials or admixtures), all materials are grounded into finished cement.
Why we need cement grinding? The main function of cement clinker grinding is to provide a finished cement product with a certain particle composition. The dispersion of cement can be expressed by fineness and specific surface area. Under the same mineral composition, the higher the dispersion, the finer the cement, the faster the hydration speed, the higher the strength, especially the early strength, but when the specific surface area exceeds a certain limit, the strong growth is not obvious, and the power consumption will increase sharply. The grinding process is different, even if the specific surface area is the same, the strength will be different.
Why the cement grinding plant is so important? To reduce transportation costs, the layout of cement production is to build a cement clinker production line in the mining area and establish a cement grinding plant near the cement sales market. If the clinker production line is built near the city, for every 1t of clinker produced, about 1.6t of cement raw material is needed, and the transportation cost should be increased by 60%. If the cement grinding plant and the clinker production line are built together in the mine, since most of the mixed materials are waste generated by the city, these mixed materials are transported to the cement factory built near the mine, ground into cement and then transported to the city. Increased transportation costs. Therefore, the clinker production line should be built near the mine, and the cement grinding station should be built near the market. The cement grinding plant is an industry with green benefits.
What is the equipment needed for the cement grinding plant? And what is the specific work process? As a cement grinding plant manufacturer, AGICO Cement can provide a cement EPC project as you need. We have rich experience in design cement plants and process cement manufacturing machines, such as cement crusher, cement ball mill, cement vertical mill, cement roller press, cement kiln, dryer, clinker cooler, and related cement equipment. Based on our experience and advanced technology support, we will help you to know all things about the cement grinding plant and welcome to contact us and learn more details.
Cement grinding machines
The equipment required for the cement grinding plant mainly includes cement roller press, cement silos, belt conveyors, cement mills, classifiers, bucket elevators, packing machines, dust collectors, etc.
- The cement silo is used to store cement clinker, gypsum, and mixture.
- The belt conveyor is used to mix and transport the cement clinker, gypsum, and mixture in a certain proportion.
- The cement roller press and cement mill are used to grind the cement raw material to the required particle size and packaging. There are two types of cement mill including a ball mill and vertical cement mill.
- The packing machine is used to pack the finished cement product into a bag according to a certain weight.
- The dust collector is used to treat the dust generated during the cement grinding process to ensure that the dust emission reaches the national requirements.
Cement grinding process
The whole workflow of the cement grinding plant is as follows: the cement clinker, gypsum, and mixture in the cement silo are mixed by the belt conveyor in a certain proportion and transported to the cement roller press, cement mill or group of them for grinding. The cement is ground by the cement mill to the required particle size. The machine is screened, and the qualified cement is sent to the cement silo by bucket elevator, and then packaged by the packing machine, and the dust generated in the process is discharged into the air after-treatment of the dust collector.
How to select cement grinding equipment?
There is no doubt that cement grinding mill and cement roller press are the core equipment of cement grinding unit. Cement grinding machine selection will directly decide the quality and cost of whole cement grinding unknit. According to the real cement projects, there are three common solutions for cement grinding plant.
- Cement roller press and ball mill
- Closed-circuit cement mill
- Cement crusher and ball mill
In summary, the first solution will be the ideal one. The second solution has advantages of simple maintenance, but it requires high energy consumption, which is uncompetitive on the market. The third one has problems of crushing effect and stable operation. The group of cement roller press and ball mill will be more recommended.
Advantages
- The cement roller press is introduced in the 1980s, after 20 years’ update, it has been found that is a mature pre-grinding technology.
- The cement roller press can greatly improve the output of ball mill, reduce the specification of ball mill, and also reduce the investment of ball mill.
- The cement roller press can save power and increase the proportion of admixture, prolong the service life of the ball mill, reduce the cost of cement production, and increase benefits of cement grinding unit.
- The cement roller press also significantly reduces the noise of the ball mill, which is good for the physical and psychological health of the worker.
The above is only a summary of the ideas formed in the survey of the construction of the grinding plant by AGICO Cement. In fact, all kinds of choices have their own advantages and disadvantages. There is no perfect solution. The key is: customers should be clear about their goals when they choose. We must consider the advanced and mature nature of the program, and also consider whether the quality of the employees of the company can be suitable. For example, from the point of view of saving electricity consumption per ton of cement and reducing operating costs, the closed-circuit vertical mill grinding system is certainly the most advanced. However, in view of the fact that some of the equipment and the particle size of the grinding plant are not ideal, it is not suitable. Therefore, with regard to the current technical level, considering the cost of the grinding plant and ensuring the quality of the cement, we agree that form of roller press + closed circuit ball mill.
