Calcium Carbonate Mill

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Calcium Carbonate Mill system operation influencing factors

1. The temperature of the inlet and outlet wind is limited by the structure of the equipment and the performance of the sealing element. The upper limit of the inlet air temperature of the Calcium Carbonate Mill is 450 °C, and the upper limit of the outlet air temperature is 110-120 °C. The moisture in the material decreases as the temperature of the grinding gas rises. For cement raw materials, it is usually controlled that the wind temperature is between 90 and 100 °C to ensure that the water content of the discharge is below 1%. When the small-sized Calcium Carbonate Mill grinds the gypsum, the Calcium Carbonate Mill has an example that the wind temperature reaches 140 °C. This is a grinding roller bearing with a thin oil circulation cooling system.

2, feed size distribution and large particle size to establish a stable grinding machine, Calcium Carbonate Mill operation requires a stable and wide particle size distribution.

The material after screening the fine powder is generally not suitable for Calcium Carbonate Mills. A Calcium Carbonate Mill in the Americas used to use 25mm sieve feed material to feed the material, which caused the body to vibrate during operation. Where the non-company is also due to the deflection of the feed storage, causing fluctuations in the incoming material, the vibration of the grinding body is up to 4mm / s.

The large particle size of the feed increases with the increase of the grinding roll, and can generally be considered as 1/40 of the diameter of the wear track, but there are also cases where the material is easy to grind and exceed the limit stable operation.

3. The increase of moisture in the feeding water feed will result in a decrease in the output of the Calcium Carbonate Mill and an increase in the specific electricity consumption. This effect increases as the degree of difficulty in evaporation of water increases. Under normal circumstances, the material moisture increased from 7% to 25%, which will reduce the output by 20% and the power consumption by 5-10%.

4. When the product fineness Calcium Carbonate Mill grinds cement raw materials or clinker, the Calcium Carbonate Mill can obtain smooth operation within the range of normal fineness variation. However, the fineness is finer, generally the power consumption is increased, and the input shaft power of the output is decreased. The actual situation needs to be determined by the test.

5. Ventilation volume and spout ring wind speed In the operation of Calcium Carbonate Mill, ventilation has two functions of entraining the material after one grinding and increasing the dispersibility necessary for effective material selection. Therefore, the Calcium Carbonate Mill should simultaneously increase the air volume when it is transferred from the standard operation to the intensive operation to ensure that the increase of the feed is compensated by the improvement of the powder selection ability caused by the increased dispersion, and the average number of cycles of the material on the grinding machine becomes Small, the value of the grinder’s η increases, but still maintains the thickness and stability of standard operation, the specific power consumption is roughly the same, this range is usually not more than 7%.

The spout ring wind speed is designed according to the requirement that the air flow must fully entrain the material. Therefore, its size mainly depends on the large material block size of the grinding machine, the degree of material agglomeration and the amount of material. The jet ring of the Calcium Carbonate Mill should have a wind speed of 80 to 90 m/s. For small Calcium Carbonate Mills, the value becomes smaller. When the Calcium Carbonate Mill is switched from standard operation to enhanced operation, the wind speed should remain unchanged. Therefore, the area of ​​the spout ring should be increased by the same ratio of the strengthening factor.

When the Calcium Carbonate Mill is operated at half load and the output is 50% of the rated value, the ventilation should be reduced to 70% of the rated value and the pressure of the roller should be appropriately reduced. At this time, the wind speed at the spout ring should be determined by commissioning, so that no leakage is appropriate.

The internal circulation Calcium Carbonate Mill should have no leakage during normal operation. During the start-up and stop-grinding process or during normal operation, when the vibration of the machine body is caused by interference, it is normal to have a leakage amount of about 50 to 100 kg. In the case of a material leakage that is more serious than the above, it should be improved by reducing the area of ​​the nozzle ring and increasing the wind speed.

6, the material wearable material is easy to wear, in addition to directly affecting the Calcium Carbonate Mill output, specific power consumption, it will also affect its good operating pressure.

When the other conditions of the grinding machine are constant, the grinding roller pressure, the input shaft power, the unit power consumption increase, and the output decreases.

When the material is easy to grind, the good working point of the roller pressure moves in the lower direction. The task of finding a good roller pressure is usually done during the commissioning phase. Some of the easy-to-wear marl is about twice as good as the hard limestone when grinding.

7. The thickness of the grinding body vibration grinding machine is improper. If the feeding material is too fine or the particle size range changes too much, the grinding machine will be unstable, causing the vibration of the reducer and the body. Excessively intense vibration is extremely harmful to the reducer and other components of the Calcium Carbonate Mill. According to the German DIN standard, the vibration intensity of heavy machinery is not more than 12mm/s. The Calcium Carbonate Mill is equipped with a special vibration meter, which can continuously monitor, display and record the vibration changes of the reducer and the running process, and has an alarm and shutdown circuit. The setting value is: alarm 5mm/s, stop 10mm/s. When the operation is normal, the vibrometer of the Calcium Carbonate Mill reads 1 to 2 mm/s.

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