Application of Laser Particle Size Analyzer in Cement Detection

Now that cement production is facing the overall cold-down status of the industry, how to break through the difficulties becomes the most important issue for cement companies. With advanced cement production optimization methods to increase productivity, energy conservation and consumption reduction can break the bottleneck, and it will also become a trend for the development of cement companies in the future. On-line particle size detection system is an indispensable condition for improving product quality, saving energy and reducing consumption, increasing production, and improving production automation.

The importance of grain size to cement

Cement is an important material in building construction. The quality of its products directly affects the quality of construction projects. Therefore, the performance and quality of cement are the most important control links in cement production.

The cement performance is closely related to the cement particle size. The size of the cement particle size directly affects a series of physical properties such as the coagulation and hardening process and strength and fluidity of the cement, as well as the physical and mechanical properties of the concrete. According to the results of foreign experts, the size of cement particles has a direct impact on the hydration process. The hydration rate and hydration degree of cement with different particle sizes vary greatly. The 0-30um particles in the cement play a major role in the strength, among which 0-10um has a high early strength, and 10-30um has a high late strength. The greater the content of 3-30um particles, the better the cement quality. Grinding process, it can not completely eliminate> 32um particles (but should minimize> 60um particles), while inevitably produce 65% <3um particle content of about 10%. Under appropriate conditions, increasing the content of this stage can achieve the purpose of improving the strength.

Cement users require uniform cement and stable quality. In particular, the requirements for cement quality in modern building construction projects are getting more and more urgent. On the one hand, China's cement industry not only needs to pay attention to how to improve the strength of cement for 3 days and 28 days, but also needs to pay attention to how to improve the quality stability of cement and reduce fluctuations.
The grinding fineness of cement affects the cement mill's output and the strength of the factory's cement. Because the finer the cement is, the larger the specific surface area, the greater the strength of each order of the cement. When the grinding fineness of 80um square hole sieve is less than 4 %, the power consumption of the grinding unit product will increase significantly and the output will decrease accordingly with the reduction of the sieve residue; therefore, the fineness of the cement grinding is usually controlled. In the 80um square hole sieve sieve , about 4 %, the specific surface area is controlled at 350m2/kg . Through the study of the grinding method and the grinding process, it can be seen that adjusting the particle size distribution of the separator can increase the strength of the cement without necessarily increasing the grinding fineness to achieve this goal.

Traditional cement particle size detection method:

The description of cement fineness can be summarized as follows: sieve residue, specific surface area, particle size distribution, average particle size, etc. Screen residue is the most common method used in cement production, and it is also a method that continues for a long time. Existing problem in the production of cement, cement fineness with 80um square mesh control has been inappropriate, should promote the use of square holes 45 μ m sieve than in cement production, with 45 μ m square mesh control cement fineness degree. However, the high 45 μ m sieve test production technology requirements, very few such products on the domestic market. The fineness represented by the specific surface area represents a big step over the sieve. Its correlation with cement properties is more universal than that of the sieve. However, the breathability method also has the problem of inaccurate testing of porous materials and fine materials, and there are still many limitations in relation to the physical properties of cement. Therefore, the fineness (80um sieve residue ) and Blaine 's specific surface area can only partially reflect the cement particles, and it is impossible to fully understand the distribution of cement particles. They are not enough to control the performance of cement and fully exert the effects of various components of cement. .
As mentioned above, even if the screening fineness is the same or the specific surface area is similar, the performance of cement sometimes shows a large difference, which is due to the fact that the particle size distribution may be different (of course, the particle shape factor is also very important ) . The specific surface area of ​​Bleb's breathable method actually contains particle accumulation factors, not the true geometrical specific surface area of ​​the particles, as shown in Figure 1. The calculation of the specific surface area value by laser has considered the shape and fineness of the particles in detail, and has nothing to do with the accumulation of particles. It may be better to correspond to the strength of the cement during its use. The laser particle size analyzer was able to derive the original grain size distribution that could not be measured in the cement industry, establishing the relationship between particle size distribution and strength.

Application of Laser Particle Size Analyzer in Cement Industry

Guorun Zhonghe Technology Development Co., Ltd. is a national high-tech enterprise specialized in the development, research and production of new types of green building materials. It has been engaged in the treatment of solid waste for more than 10 years and the research of cement-based and related materials for more than 20 years. There are two major production bases in Shandong and Shanxi, and one national key laboratory, which has a strong R&D team and R&D capabilities.

Guorun Zhonghe Technology Development Co., Ltd. and Jinan Micron cooperated with winner2000E to measure the cement particle size and achieved good results. The experimental test report is as follows:

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