The temperature of the clinker is high, the heat of the material itself is brought into the mill, and most of the mechanical energy of the grinding body is converted into heat energy during the operation of the mill, so that the temperature inside the cement mill is high, and the wearability of the material is related to temperature. Increase and decrease. In the area with high fineness in the cement mill, due to impact and grinding, the fine particles are attracted to each other with a certain charge, so-called "electrostatic effect", causing the smallest particles of cement to stick into the mass and adhere to the grinding body and the lining. The plate significantly hinders the progress of the grinding process. The higher the temperature, the more serious this phenomenon is.
High temperatures in the mill can also cause partial dehydration of the gypsum to become hemihydrate gypsum, or complete dehydration into anhydrite. such. It will cause rapid solidification or pseudo-coagulation of cement, which will affect the quality of cement, and at the same time, paste and coalescence will occur, making production difficult and reducing the grinding efficiency. Generally, the milled clinker temperature exceeds 80 ° C, and the cement mill output is reduced by about 10 to 15%.
The high temperature inside the mill is also very unfavorable to the machine itself. For example, the bearing temperature is increased, the lubrication effect is lowered, and maintenance is difficult; the simplified body generates significant thermal stress, causing geometric deformation of the lining plate, and the lining bolt is broken. Therefore, the temperature of the clinker should be controlled at room temperature, the maximum temperature should not exceed 50 ° C, and the temperature of the cement should not exceed 110 ° C.
When dry grinding, the moisture of the milled material has a great influence on the quality and operation of the mill. If the moisture of the milled material is too large, the moisture in the mill will evaporate into steam due to the heat in the mill, and the moisture content in the mill will increase. Therefore, the fine particle material adheres to the grinding body and the material plate to form a "material pad", so that the grinding efficiency is remarkably lowered. In severe cases, it will also cause blockage of the compartment board and the discharge board, resulting in "blocking" and "saturated" phenomenon. If it is not handled in time, it will even cause a strong "grinding inner ring" and be forced to stop cleaning.
If the moisture content of the material is too large, the material in the grinding head bin will be sticky, resulting in uneven feeding and affecting the uniformity of the raw material composition. If the moisture content of the material is too large, it is not good. If the material is too dry, the following problems may occur;
1, drying materials, drying efficiency is significantly reduced drying coal consumption increases, reducing the dryer production, increase the cost.
2, the material is too dry, the flow rate in the mill is accelerated, there will be a phenomenon of honing and running, especially when grinding slag and shale slag.
3. Keep a small amount of water in the material. When vaporizing in the mill, it can take away part of the heat and reduce the grinding temperature; a small amount of water vapor forms a water film on the surface of the material particles, which is beneficial to the dispersion of the powder. Therefore, a small amount of water vapor also plays a role in improving the grinding efficiency.
In summary, the average moisture content of the milled material is generally controlled to be between 1 and 1.5%.
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