What are the benefits of water spraying in cement mill? -Henan Red Star

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What are the benefits of water spraying in cement mill?

stay Cement mill In the process of cement production, the temperature of cement powder will be much higher, which will bring bad effect on the temperature of cement powder. Therefore, water spraying in cement mill is an inevitable choice to reduce the temperature of cement grinding materials and improve the grinding efficiency. The main advantages of water spraying in cement mill are as follows:

1. Guaranteed cement

In cement grinding, when the temperature in the mill is too high, the gypsum, calcium sulfate dihydrate (CaSO4 · 2H2O), will dehydrate and form hemihydrate gypsum. The dehydration of dihydrate gypsum began at 105 ℃, but the reaction was not obvious due to the low pressure. When the temperature is above 140 ℃, it is obvious. The setting speed of hemihydrate gypsum is fast, and the effect of retarder is lost, which makes the cement appear false setting phenomenon and decrease. After spraying water in the mill, the temperature in the mill decreases, which prevents the dehydration of dihydrate gypsum and ensures the cement quality.

2. Increase mill output

In the process of cement grinding, a lot of fine particles are produced, especially in the fine grinding bin. These fine particles will produce a kind of aggregation phenomenon and adhere to the surface of abrasive body and lining plate. This phenomenon is called“ Ball Lake phenomenon ”Some of them are called "wrapping ball" or "material cladding". The fine particle layer formed in this way is actually a cushion to cushion the impact and grinding of the grinding body, resulting in low grinding efficiency and high power consumption.

 Cement mill

The paste ball phenomenon is related to temperature. The higher the temperature, the more serious the paste ball phenomenon. For example, when the temperature in the mill reaches 121 ℃, and the material is ground to the specific surface area of 1200 ~ 1500 cm? 2 / g, the paste ball phenomenon will occur. This shows that when the temperature in the mill is too high, even the materials with larger particles will have paste ball phenomenon.

3. Improving grindability of clinker

Generally speaking, there are many small pores on the surface of clinker block. When the water droplets like mist are immersed, the internal stress increases, the external force required for splitting decreases, and the grindability is improved. Therefore, after spraying water in the mill, the output of cement mill will be increased.

Due to the above two reasons, the increase in production of cement mill after spraying water inside the mill is obvious, and the larger the cement mill size, the more obvious it will be.

4. Reduce the temperature and power consumption of grinding cement

5. Improve the operation rate and mission of the equipment

If the temperature in the mill is too high, the temperature of the barrel will also increase, which is very easy to produce oxidation corrosion. Due to the high temperature of the grinding body and lining plate in the mill, the wear will increase correspondingly. If the sleeve bag dust collector is installed after grinding, the service life of sleeve bag will be reduced due to the high temperature of cement discharged from the mill. If an electric dust collector is installed after grinding, the specific resistance will increase due to the high temperature of cement out of the mill, which will affect the dust collection efficiency. Therefore, the operation rate and service life of the equipment will be improved by using water spraying in the mill. In addition, the temperature in the mill is too high, which endangers the safety of the main bearing spherical bush.

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