7 factors affecting the output of ball mill
Raw material size
Since a shaft kiln cement plant uses a small ball mill, the particle size of the raw material will greatly affect its capacity and quality. The smaller the particle size, the higher the output and quality of the ball mill. On the contrary, the larger the particle size, the lower the output and quality of the mill, and the higher the power consumption.
Abrasion resistance of raw materials
The wear resistance of raw materials refers to the difficulty of grinding materials by high energy ball mills. The national standard stipulates that Wi (kwh/t) is used to represent the grinding index. The smaller the grinding index, the better the grinding effect of the material. Cement plants are accustomed to using the relative grindability coefficient to express the difficulty of grinding materials. It compares the material to be tested with a standard sand using an experimental small mill to achieve a specified fineness value and calculates the grinding time.
raw material moisture
As for the dry milling method, the moisture content of the raw material will affect the capacity and quality of the ball mill. The higher the moisture content of the grinding material, it will lead to saturation or greasy, which will reduce the capacity and quality of the ball mill. Therefore, raw materials with high moisture content should be dried before being ground by a ball mill.
raw material temperature
If the raw material temperature and the impact friction of the grinding body are too high, the temperature inside the ball mill will be too high and the balls will stick, which will reduce the production capacity of the ball mill and affect the quality of the ball mill. At the same time, the barrel of the ball mill is affected by thermal expansion, which affects the long-term safe operation of the ball mill. Therefore, it is necessary to strictly control the raw material temperature.
Abrasive fineness requirements
The finer the material to be ground, the lower the output.
grinding process
For the ball mill of the same specification, the output of the closed-circuit process is 15-20% higher than that of the open-circuit process. In closed-circuit operation, choosing the appropriate powder selection efficiency and cycle load rate is an important factor to increase the capacity of the ball mill.
The role of grinding aids
Some grinding aids can affect the grinding effect. Commonly used grinding aids are organic substances with strong surface activity. During the grinding process, the grinding aid can be absorbed by the raw material, which will accelerate the propagation of cracks in the material grinding process, reduce the mutual adhesion between fine powders, improve the grinding efficiency, and benefit energy saving. High output of ball mill. The national standard stipulates that grinding aids can be added in the cement production process, but the amount added should not exceed 1%.
7 Ways to Increase Ball Mill Production Capacity
Use cement grinding aids
Add a small amount of cement grinding aid to improve the grinding efficiency of the ball mill during the firing process. Due to the use of cement grinding aids by enterprises, the growth rate of ball mills has increased by more than 10%, the unit energy consumption has decreased by about 10%, and the amount of mixed materials has increased by about 5%.
Control Humidity and Temperature
The moisture content of the raw material entering the factory should be strictly controlled and carefully inspected, and the temperature of the ground material should be strictly controlled within the scope of the process. In order to ensure the stable capacity of the ball mill, the comprehensive moisture of raw materials should be less than 1%.
Control the wear resistance of raw materials
In order to ensure the wear resistance of raw materials, the first is to choose clinker with good wear resistance, and the second is to choose mixed materials with good activity and wear resistance.
control ventilation
To ensure good internal ventilation circulation, all ventilation ducts should be cleaned regularly under normal production conditions. Clean the dust collector once a week and clean out the warehouse when the machine is out of operation. For the ventilation of the pulverizer, the powder selection efficiency should be adjusted appropriately to ensure the stable improvement of the output and quality of the ball mill.
Adjust the grade of the ball mill media
Increase ball load when equipment configuration allows. Determine the number of auxiliary grinding balls based on the actual measured grinding ball consumption per ton. Supplement the ball mill medium according to the changes of ball mill current, grinding sound, output and quality in daily production. Typically, a warehouse can use grade 3-4 balls, and a finely ground litter box can use grade 2-3 balls.
Control the fineness of the finished product
In production control, we mainly use sieve analysis method and cement specific surface area method to control cement fineness. The 0.08mm sieve residue should be controlled within the range of 2.5% to 3%, and the specific surface area of cement should be controlled within the range of 360 to 375m2/kg.
Strict control of material size
The method of "more crushing and less grinding" is adopted to control the size of raw materials. The second is to control and track the particle size of the mixed material to truly rationalize the size of the various materials.
FTM Machinery's Ball Mill For Sale Media
Steel balls are important ball mill media. They wear and peel off through the collision and friction between the steel ball and the material and the ball of the ball mill. During the working process of the ball mill, whether the classification of the grinding steel balls is reasonable is related to the working efficiency of the ball mill equipment. Only by ensuring a certain proportion of various balls can the grain size structure of the material be adapted to a good grinding effect. Reasonable selection of the ball grade of the ball mill is the measure required to improve the quality of the ball mill. Here we will see how to properly grade ball mill media.
The basic principle of ball mill classification
Grinding balls should have a high impact force and ball mill balls also need to be large in size if they are dealing with hard rock material. The harder the raw material, the larger the diameter of the steel ball. The ball diameter of the double storage partition should be smaller than the single layer partition of the same discharge section.
The working principle of ball mill
Ball mill steel ball adding skills
The ball ratio of the ball mill should be judged according to the effective length of the mill, whether it is equipped with a roller press, the feed size, the lining material and structure, and the rotational speed. After the ball mill is installed, the gears of the size of the ball mill need to be meshed, and the processing volume also gradually increases. After two or three days of normal operation of the ball mill, please check the meshing condition of the large gear and the small gear. Before everything is normal, open the manhole cover of the ball mill and add the remaining 20% steel balls for the second time.
Matters needing attention in ball mill steel ball classification
1. The friction between the ball, the ball and the ore, the ball and the liner of the ball mill will increase the wear of the ball mill during normal operation. So, under normal circumstances, you don't need to add pellets.
2. The steel balls in the ball mill are constantly worn during operation. In order to maintain the ball filling rate and reasonable ball proportion, and make the ball mill run stably, it is necessary to add balls to compensate for wear.
3. The weight of a steel ball depends on its mass. The quality of the steel ball determines the capacity of the ball mill. The quality of the steel ball is calculated based on the processing amount per ton of ore (that is, 0.8 kg per ton of ore). The average steel ball needs to process one ton of ore (1kg-1.2kg).
In general, the proportion of ball mill balls is a complex technical issue. Each concentrator needs to carefully analyze its actual situation. Through long-term research and accumulation, you can find the matching rate that suits you. In addition, the ball ratio also includes the size and number of grinding balls.
