As we all know, coal washing Hydrocyclone It is very important to influence the fractional particle size of mucus in the working process. If the grading particle size is too large, part of coarse coal slurry will enter into the subsequent process, which will cause the normal operation of the concentration and pressure filtration loop, and make the whole washing system unable to work normally; if the grading particle size is too small, the concentration of material flow at the bottom of coal washing cyclone will be reduced, which will affect the dewatering operation in the subsequent process steps.
In view of the above problems, the adjustment of the coal washing cyclone is mainly realized by changing the feed rate and the size of the bottom outlet. The size of the bottom flow port has a great influence on the underflow concentration. During the operation, attention should be paid to make the bottom flow rotate in umbrella shape and keep the central air column in the cyclone. In order to reduce the size of the classification, the feed rate can be increased, and the bottom flow rate can be increased accordingly, or the feed rate and the bottom flow rate can be increased slightly, and the underflow concentration will be reduced. In the actual use process, the bottom flow port is adjusted according to the characteristics of process design and the operation law of coal preparation cyclone. Only by mastering the influence law of whirlwind on the production process can we effectively adjust and achieve the purpose of quality assurance.
At the same time, it should also be noted that the operation of the remaining part of the cyclone is normal, including ensuring that the feed performance of the cyclone is stable, which is the main guarantee to obtain good technical indicators; the concentration of materials is used to reduce the particle size of classification; the bottom opening of the cyclone is not directly connected to the closed pipeline. Because the atmosphere and the mid point air column can not be connected freely, the shape of the gas column is unstable, which will destroy the normal flow state in the cyclone separator.