Cement ball mill is one of the necessary equipment in the cement plant. However, during the grinding process, a poor control will cause the inside of the mill to heat up beyond the specified range and cause a series of bad influences.
Cement ball mill is one of the necessary equipment in the cement plant. However, during the grinding process, a poor control will cause the inside of the mill to heat up beyond the specified range and cause a series of bad influences. We will explain the danger of high temperature in the cement ball mill.
First, the grindability of the material decreases as the temperature increases. In areas where the fineness of fineness is high, fine particles of cement will rub against each other to generate electrostatic adsorption. In addition to mutual condensation, they also adsorb on the grinding body to form a buffer layer, which reduces the grinding effect of the cement ball mill. The higher the temperature, the more serious the agglomeration of the grinding side effects. The high temperature inside the cement ball mill will cause the retarding coagulant of the cement - the gypsum is completely dehydrated, making the cement false or quick-setting, affecting the quality of the cement.
Second, because the cement ball mill is in operation, especially when it stops grinding, it causes a large temperature difference on the grinding body, which causes significant thermal stress and thermal deformation, and even causes damage to the cement ball mill machine parts. Thermal deformation causes stoppage of the grinding force, which results in a cohesive force, which results in a current ripple and vibration during operation. The heat of the cement ball mill is transmitted to the main bearing, which raises the temperature of the main bearing and makes it difficult to care for it.
Third, the grinding process will generate heat, large ball mill or in fine grinding requirements of fine cement, even if the clinker into the grinding temperature is not high, it will make the temperature within the mill increased and unfavorable grinding.
Fourth, the high temperature within the mill will cause false cement coagulation, affect the quality of cement, and easy to make the storage cement agglomeration. The temperature of cement produced should not exceed 110~120°C, and the high temperature of cement will make the paper bag brittle and increase the breakage rate.
Fifth, to control the temperature of the cement ball mill, first of all to control the temperature of the material into the mill, into the mill material temperature should be controlled at room temperature, preferably not more than 50 °C. Into the mill material temperature is high, the material brought into the mill a lot of heat, coupled with the ball mill grinding, most of the mechanical energy into heat, resulting in a higher temperature inside the mill. Easy to cause the cement to agglomerate due to electrostatic attraction, which can seriously adhere to the grinding body and the liner and reduce the grinding efficiency.
Sixth, the high temperature within the mill is unfavorable to the ball mill machinery itself. If the bearing temperature rises, the lubrication effect is reduced, and the cylinder body will also generate a certain thermal stress, causing the backboard screw to break.
Therefore, during the operation of the ball mill, special attention must be paid to the daily maintenance and care of the ball mill.