Causes of material blockage in cement mills Causes of material blockage in cement mills and how to solve them
Customers often encounter the "full grinding" phenomenon when using cement ball mills. So how should we deal with this phenomenon? What is the reason for the "full grinding" phenomenon in cement ball mills? Let's learn and understand together. The cement ball mill's full grinding is caused by the imbalance of the inlet and outlet of the tube mill. In a short period of time, the cement ball mill has too much material. The simple understanding is "too full". The reasons are:
The cement ball mill feeds too much material and the grinding capacity of the grinding body cannot adapt. Moreover, the particle size of the materials entering the cement ball mill became larger or the grindability became worse, and the feeding amount was not reduced in time. Moreover, the moisture content of the materials entering the cement ball mill is too high and the ventilation is poor. The wind cannot take the water vapor and fine materials generated during the grinding process out of the cement ball mill in time, causing the materials to adhere to the steel inside the cement ball mill due to high humidity. The surface of the ball and liner increases the buffering effect and reduces the grinding efficiency. At the same time, the wet material also blocks the gap between the cement ball mill partition plate and the discharge grate plate, causing difficulty in discharging the cement ball mill.
"Saturated grinding" caused by this reason is more common. The grate joints of the cement ball mill compartments were blocked by scrap iron filings and debris. In the closed-circuit system, the powder selection efficiency of the powder separator is greatly reduced, the amount of returned material is too much, and the feeding amount is not reduced, and the grinding capacity of the cement ball mill cannot adapt. Another problem is that the average ball diameter of the first warehouse of the cement ball mill is too small, or the filling rate is too low, or the filling rate of the grinding body in the first warehouse is much lower than that in the second warehouse. Finally, attention should be paid to the partial breakage or perforation of one or two partition plates between the first and second chambers of the cement ball mill, causing the grinding body to escape and the grinding capacity to be greatly reduced.
Reasons why the cement mill is blocked, reasons why the cement mill is blocked, what to do if the cement ball mill does not discharge material, cement ball mill is full of grinding
Once the cement ball mill is "full of grinding", the cause should be carefully identified and eliminated. The elimination method is generally to reduce or stop feeding, and strengthen the ventilation inside the mill, so that the cement ball mill can operate with little or no material to generate more heat. The drying mill should increase the heat added to the cement ball mill to promote the water to evaporate quickly and be taken away by the hot air flow. At the same time, the materials adhered to the steel balls, lining plates and compartment plate grates in the cement ball mill will crack under the thermal expansion of the adherends and peel off under the repeated impact of the grinding body. If it is ineffective, you can add grinding aid materials to the cement ball mill while stopping feeding the cement ball mill. After the sound in the cement ball mill is close to normal, feed a small amount of materials. After the sound in the cement ball mill is normal, gradually increase the feeding amount until the feeding is normal.
When the cement ball mill is severely saturated, sometimes it is necessary to use back grinding: pour out the balls and materials in the bin, completely cut off the crust on the lining plate and steel balls, remove the blockage in the grate seam of the partition plate, and then Re-match the balls or refill the dumped balls. When the cement ball mill needs to be cleared, it is appropriate to use back grinding.
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