When the output of cement grinding equipment is low and the fineness of the product is coarse, it shows that the load of the abrasive body is insufficient or the abrasive body wears too much, the abrasive body should be added at this time. 
When the output of cement grinding mill is not high and the fineness of the product is coarse, it shows that the flow velocity of material in the mill is too fast, the grinding ability is too strong, and the grinding ability is not enough, which is caused by the excessive average ball diameter. At this time, it should be appropriate to reduce the large ball, increase the ball and exercise to improve the grinding capacity, reduce the gap between the grinding bodies so that the flow rate of materials in the grinding is slowed down, prolong the residence time of materials in the grinding, in order to get full grinding. When the warehouse is often full of grinding and the flow of materials in the mill is not smooth, while the output is low, product fineness is fine, and sometimes stop feeding, indicating that the grinding capacity of cement grinding is insufficient, which can increase the ball, cancel part of the ball, to increase the grinding capacity of a warehouse. However, attention should be paid to other factors, if the grinding material moisture caused by excessive grinding phenomenon, it can not be taken to increase the autumn method, but should control the material moisture. If the mill output is high and the fineness of the product is fine, it shows that the loading and gradation of the abrasive body are reasonable. 
According to the grinding sound judgment: under the normal feeding condition, the impact of a bin of steel balls is strong, there is a clatter sound, if the impact of the first bin of steel balls is particularly loud, indicating that the average diameter of a bin of steel balls is too large or the filling rate is large. If the sound is muffled, it indicates that the average ball diameter of the steel ball in the first bin is too small or the filling rate is too low. At this time, the average ball diameter and the filling rate of the steel ball should be increased. When the second warehouse is normal, the brushing of the abrasive body can be heard. 
Cement grinding inspection of material conditions in the mill: in the case of normal feeding mill, while stopping feeding and mill operation, open the grinding door to observe the situation of the ball mill. 
According to the production experience, the steel balls in one bin should be exposed to half of the ball and the material surface, and in the second bin, the abrasive body should be covered with a thin layer of 10-20 mm, indicating that the steel ball gradation is reasonable. If a steel ball is exposed too much, it means that the load is too high or the average diameter of the steel ball is too large. On the contrary, it shows that the load is too small or the average diameter of the steel ball is too small. The ball material is relatively small, the material flow rate is slow, and the grinding capacity is insufficient. The same principle, such as two storehouse spherical exposure, plus too much autumn, if the two storehouse material layer is too thick, indicating that the ball is too little. 
2. Relationship between cyclic loading rate and flour dressing efficiency 
The powdered efficiency is related to the cyclic load. For the same kind of grinding system, the effect of cement grinding equipment increases with the increase of cyclic load, and increases with the improvement of flour separation efficiency. The flour separation efficiency decreases with the increase of cyclic load, so the flour separation efficiency can not be pursued unilaterally and the cyclic load can not be increased too much. It is necessary to improve the efficiency of powder separation under suitable cyclic loading so as to effectively provide high grinding efficiency. 
Cement particle is a kind of artificial particle. Cement particle has two characteristics: high required surface area and polydispersity. The powder state of cement is generally expressed as grinding degree, particle distribution and particle shape. 
Cement fineness: Cement particle size is the fineness of cement, cement fineness directly affects the cement setting, hydration, hardening and degree of a series of physical properties. 
The effect of fineness of cement is one of the parameters of cement grinding process. As we all know, under the condition of stable cement clinker and composition, in order to achieve the stability of cement quality, it is through the change of cement fineness to investigate the feed rate, air flow and other mill process parameters. At the same time, the finer the cement mill, the better its hydration performance, but in the actual production process through the design and control of cement fineness, to achieve the main grinding effect and grinding cost balance. Fineness and reasonable control can not only improve cement quality steadily, but also have practical significance for energy saving and consumption reduction, so fineness is the technological parameter of cement grinding. Adjust the performance of cement. The finer the cement is ground, the faster the hydration speed is, and the higher the strength is. But the corresponding negative effects are that the demand for cement increases, the drying shrinkage increases, and the construction performance becomes worse. When the clinker ore composition and cement composition are fixed, these can only be adjusted by the fineness of cement within a certain range. 
The standard of cement grinding cement in China stipulates that the fineness of cement products is 80 micron m and the surplus of square hole sieve should not exceed 10%. The method of controlling fineness is simple and feasible. Under certain grinding conditions, cement strength has a certain relationship with fineness. 
In the cement grinding station, it is not a homogeneous single particle, but contains different particle size - particle groups, so in the evaluation of cement fineness, if we only use the simple expression of sieve residue, almost 90% of cement particles are formed under the sieve through the sieve hole. However, the size of the particles under the sieve is not clear, so the sieve. The surface area of the residual phase will also be very different. 
Average particle size can be expressed in several ways: arithmetic average diameter, geometric average diameter, harmonic average diameter, etc. The average particle size of cement particles is an important geometric parameter to characterize the cement particle system, but the information of particle size characteristics is very limited, because two particles with the same average particle size may have different particle size composition. 
Specific Surface Area of Cement: Most foreign cement standards stipulate specific surface area index, generally using Brinell specific surface area meter to measure specific surface area of cement, China's Portland cement and clinker national standards have been consistent with foreign standards. There is a good relationship between the specific surface area of cement and the properties of cement. 
However, when using specific surface area to control cement quality, there are mainly