Five Ways to Improve the Grinding Efficiency of Cement Pipe MillDate: 2019-07-08 Views:
At present, China's cement production enterprises mainly use five technologies in improving the grinding efficiency. They are cement pre-grinding technology, equipment modification technology, powder separator transformation technology, new abrasive body and grinding aid. From the perspective of improving the grinding efficiency of cement tube mills, the author has conducted in-depth research on the above five technical methods.
First, PCJ impact fine crusher technology
The PcJ impact fine crusher technology is one of the pre-grinding techniques. Since there are many factors affecting the grinding efficiency during the cement production process, the most influential one is the abrasive particles. The smaller the abrasive particles, the higher the grinding efficiency. The traditional pre-grinding mechanical grinding efficiency is not very satisfactory. In response to this problem, the PCJ impact fine crusher technology can solve the grinding efficiency problem well. The technology adopts the crushing method in modern technology to improve the kinetic energy between the abrasives, so that the grinding efficiency is higher, the cost is lower, and the equipment loss is small.
By adjusting the sieve joints in the fine crusher, accurate screening of the discharged pellets can be achieved, so that the milled products meet the standard requirements. The use of PCJ impact fine crusher technology can effectively increase the output of the mill and reduce the cost per unit. At present, some cement production enterprises have further optimized the technology on the basis of this, and the pre-grinding technology has become the main means to improve the grinding efficiency.
Second, the transformation of the internal equipment of the cement pipe mill
During the grinding process of the cement tube mill, the grinding efficiency has a direct relationship with the particle size of the material and the size of the grinding body. In order to improve the grinding efficiency, it is feasible to control the size of the grinding body. Since the method of controlling the size of the grinding body is more and easier to implement, some enterprises are more inclined to the latter between the technical optimization and the device modification. Among them, there are four main ways of transformation: sieve partition plate, micro-grinding body, activation device, and graded lining.
The sieve partitioning plate is a device for screening the fine grinding material, which can strengthen the grinding effect of the device to a certain extent, and timely screen the fine material that has been ground.
The micro-grinding body can increase the contact area with the material, and can greatly improve the grinding efficiency and strengthen the grinding effect for the normally easy-grinding material.
The activation device refers to the installation of a "trapezoidal device" inside the original device, so that a specific angle is formed between the mill liner and the mill shaft, so that during the grinding process, the grinding body will be along the liner inside the device. By doing circular and axial movements, the exercise intensity is greatly increased, thereby improving the grinding efficiency.
The grading lining means that the grinding body of different sizes is classified inside the device, and the size of the material is sieved, so that the larger grinding body grinds the larger volume of the material, and the small grinding body is finely ground to reach The best grading work effect.
In general, the use of internal equipment transformation, the grinding efficiency is very obvious, and the cost is low, the input cost is not high, which is conducive to the development of cement production enterprises.
Third, high-efficiency classifier transformation technology
The classifier has a great influence on the grinding efficiency of the mill. Therefore, the technical transformation of the classifier can also achieve the effect of improving the grinding efficiency. At present, most companies use two types of separators, centrifugal and cyclone.
Centrifugal type is the most widely used classifier in cement production enterprises. The main method of transformation is to transform the small blades in the internal structure, increase the cutting area of the material selection machine, improve the classification effect, or improve the powder selection. The fine powder collection ability of the machine and the two technical transformation methods can achieve the effect of improving the grinding efficiency. Technical optimization of the classifier is more economical than replacing a new classifier, which can save a lot of input costs and improve equipment utilization.
When the cyclone type is modified, it is in the same direction as the centrifugal transformation, but the specific modification method is different. In the transformation of the blades, the propeller-type material is replaced, so that the materials in the classifier are more dispersed. Or it is to transform the dust collection system, improve the internal ventilation capacity of the classifier, improve the dust collection effect, and then enhance the grinding efficiency.
After the modification of the classifier, the output of the mill is greatly increased, and the investment cost can be recovered within one year. However, some large-scale cement production enterprises will not adopt the technology of selecting the powder separator, but use the high-frequency vortex separator.
Fourth, the use of new abrasive bodies
The new type of grinding body does not only refer to the use of new materials, but also includes new structural shapes. Conventional abrasive bodies are all spherical, and each of the abrasive bodies can be in effective contact. In recent years, foreign industrial building materials companies have begun to adopt new ellipsoidal grinding bodies, and the grinding effect is better than the traditional spherical shape. The ellipsoidal grinding body has a larger grinding area and stronger impact between the spheres. At present, some cement manufacturers have introduced and used ellipsoidal grinding bodies to improve the grinding efficiency. From the point of view of cost and the grinding effect, the new grinding body is more excellent than the optimized device, and it is more in line with the construction and production requirements of modern enterprises, saving some cost investment.
Fifth, the use of grinding aids
Grinding aids are indispensable materials in the ultra-fine grinding process, which can prevent the healing between material cracks and prevent the condensation between materials. The grinding aid can effectively reduce the static electricity generated during the friction process of the material, reduce the adsorption caused by the static electricity, and prevent the material from sticking to the grinding body, thereby improving the grinding efficiency. Since the grinding aid is special, different grinding stages have different requirements, so the grinding aid should be used carefully in combination with the specific conditions of the grinding.
Through research on the cement tube mill transformation technology, the author proposes a variety of transformation techniques to improve the grinding efficiency of the mill, including cement pre-grinding technology, equipment modification technology, powder separator transformation technology, new grinding body and assistance. The use of abrasives. All of the above technologies can achieve a good grinding effect. However, which kind of transformation technology is used, it is necessary to combine the cost input of cement production enterprises and select one or more suitable transformation technologies to promote the construction and development of cement production enterprises. .