How to improve the production capacity of the mill and play the benefit of the mill

Reasonable grinding body classification and load are the basic requirements to ensure the good operation of the cement vertical grinding system. Unreasonable grinding body classification and load will not only affect the specific surface area and fineness of the product, but also limit the output of the mill. Therefore, optimizing the grade and load of the grinding body is very important to improve the output and quality of the mill. According to the specific working conditions and the specific conditions of the mill, the phoenix wear-resistant steel ball grading plan is scientifically proportioned to comprehensively increase the production capacity of the mill. At the same time, the use of the phoenix brand grinding body can better protect the lining of the mill barrel. Reduce the number of times that the mill is stopped for maintenance and give full play to the benefits of the mill.


Reasonable mill gradation

The optimization principle of grinding body gradation of mill:

According to the particle distribution law of the material to be ground, the two ends of the ball are large and medium and small. Because the particle size of the material changes from large to small during the material grinding process, the large particles gradually decrease, the fine particles continue to increase, and the grinding impact force is no longer important, mainly the number of impacts. According to the particle size, hardness, grindability and product fineness requirements of the material to be ground, the ball is matched. When the material to be ground is small, the grindability is good and the fineness of the product is required to be good, so the grinding effect on the material should be enhanced. The diameter of the grinding body should be small. The grinding body grades are different between large mills and small mills, raw mills and cement mills. Due to the short barrel of the small mill, the material will stay in the mill for a short time, which will extend the residence time of the material in the mill. Time, for large mills, the average ball diameter should be small; because the coarseness of the coarse powder is high, the particle size of clay and iron powder is small, so the coarse powder mill should strengthen the hammer of the crusher and reduce the grinding effect in the crushing bin . If only large balls are used in the mill, the void ratio between the steel balls is large, the material flow rate is fast, and the material discharged from the grinding is rough. In order to control the flow rate of the material flow and meet the fineness requirements, please use large and small balls at the same time to reduce the porosity of the steel balls. Reduce the material flow rate and extend the residence time of the material in the grinder. Single-chamber mills should be equipped with steel balls; double-chamber mills use steel balls in the front chamber and steel balls or forged steel in the back chamber. Usually, the first two chambers of a three-chamber rolling mill are equipped with steel balls, and the remaining chambers are equipped with steel forgings. In a closed-circuit rolling mill, the impact force of the steel balls is weakened due to the return of the material due to the cushioning effect of the buffer layer, so the average ball diameter of the steel balls should be larger. Due to the wear of the liner, the ball-carrying capacity of the mill is insufficient, and the impact force is reduced, so the large ball should be appropriately increased.



Principles for optimization of mill filling rate:

When the product fineness range can be relaxed, high output is pursued and the ball-to-pool ratio in the mill is not high, the filling rate needs to be increased. When the material is easy to grind, the filling rate can be increased to increase the output; however, when the material has poor grindability, the filling rate cannot be increased in pursuit of output, especially in the forging warehouse, which will reduce the grinding efficiency. When the material size is large, the hardness is large, and the crushing function is required, the filling rate should be higher. If the silo discharge is poor, the ball to battery ratio is small and the silo has too much material, the filling rate cannot be too high, because the filling rate is too high, the rate will take up less space in the warehouse, thereby greatly reducing The impact height of the grinding body. The new liner has a strong lifting capacity for the grinding body, a high abrasive belt and a low filling rate. A ball mill with a single compartment plate device. Since the discharge of the front compartment is affected by the rear compartment, the filling rate of the front compartment is usually higher than that of the rear compartment; the device with a lifting compartment plate is used For the double-layer ball mill, because the discharge of the front compartment is not affected by the back bin, the filling rate of the back bin can be equal to or slightly higher than the filling rate of the back bin. First, the silo is carried out according to the operation bar. For the second silo mill, when grinding cement, the filling rate of the second silo is usually 2 times larger than * silo. When grinding raw materials, the filling rate of the second hopper is about 1.2 times greater than or about the same as the filling rate of the first hopper. For a mill with a classifier, the filling rate of the abrasive in the mill usually decreases with different bins. The spherical height difference between the front and rear bins can generally be controlled within 25mm~50mm, which can increase the material in the mill There is no mill with a classifier, and the filling rate of the abrasive in the mill is usually increased between the silos to control the fineness. The filling rate of each bin of the mill is also affected by the size of the grate gap. The size of the grate determines the flow rate of the material through the grate plate and affects the level of the material in each bin of the mill. Obviously, high fill rates must be used for high material levels. If the material level is low, of course such a high filling rate is not necessary; in addition, due to the moisture, fluidity and particle size of the material will affect the flow rate of the material in the mill, which will also cause the liquid level of the material in the mill to be different. At this time, the filling rate of each position of the mill should be adjusted according to the actual situation.
If the grain size of the grinding material is relatively coarse or the large-scale mill, the filling rate should be low. The total amount of the grinding body is 88%~93% of the designed amount to increase the impact; the grain size of the grinding material is finer and the filling rate of the small mill It can be higher, and the total load of the all-grinding body can reach 94%-97% of the designed amount to increase the power. The filling rate of the ball mill is generally controlled to be between 25% and 35%, the filling rate of the closed circuit mill is 28% to 32%, and the average filling rate of the open circuit mill is 25% to 28%.