Study on material fineness of grinding system in cement production line

Date: 2019-06-26 Views:

Modern dry process cement production lines generally adopt the process of “two grinding and one burning”, which shows that the grinding system is the core link. The level of the grinding system technology directly affects the working efficiency of the cement production line and affects the production quality of the cement. Therefore, in order to improve the development level of the modern cement industry, the design technology of the grinding system is the basis.

Cement production line

In the cement grinding system, the grinding fineness is an important indicator to determine the level of the process, because the size of the grinding affects the product quality and power consumption of the mill, and it is also related to the subsequent work, so it is crucial. important. Today we mainly analyze how to effectively improve the fineness of the grinding on the cement production line.

1, fineness related concepts

Fineness is usually expressed by sieve residue, specific surface area or particle gradation. Different product boxes require different product quality (today we mainly focus on cement product fineness), and the fineness range controlled by production is different. The fineness is expressed as a percentage of the original amount of the sieve on the sieve, and the smaller the sieve residue, the finer the powder. The specific surface area means the surface area per kilogram of powder. Generally, the finer the powder, the larger the specific surface area. The particle size analysis describes the particle size analysis of the particle group, which refers to the ratio of various large particles to the total number of particles, reflecting The size of the particle size and the corresponding quantitative relationship.

2, cement grinding fineness

The significance of cement grinding fineness is to further develop and utilize the quality potential of cement clinker. Cement fineness is closely related to cement strength and production efficiency.

a. Cement fineness, specific surface area According to the general principle of reaction kinetics, the larger the surface area of ​​the reactant, the faster the reaction rate. Therefore, increasing the fineness of the cement and increasing the specific surface area can accelerate the hydration speed. The control of the specific surface area or characteristic particle size of ordinary cement is shown in the following table.

Reference ratio of specific cement surface area control of different strength grades
b. Particle grading Research and production practices have shown that cement strength is related to cement particle gradation, bulk density and morphology, in addition to the specific surface area. Therefore, simply using the specific surface area data often cannot accurately reflect the change of the standard strength of the cement, and it is also necessary to combine the particle grading to obtain a reliable judgment result. The effect of cement particle size on cement performance is mainly due to the difference in hydration speed of particles of different sizes.

c. Fineness detection and control In the traditional physical quantity test of the cement industry, the fineness and the gas permeability method are used to determine the specific surface area by the sieving method, and they cannot completely and accurately determine the particle size distribution. With the advancement of technology and the development and application of particle size distribution meters, it is more effective than the traditional fineness test method for production quality control. In addition to showing the distribution of material particles, it can also measure the particle size data, calculate the fineness, characteristic particle size and specific surface area, and provide comprehensive particle size data for production.

The above is the whole content of the material particle size problem in the cement production line we analyzed. The cement production line configured by our company can help customers achieve the ideal fineness standard and ensure the economic benefits of production.

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