Function and technical requirements of pelletizing in non-sintered ceramsite production

Pelletizing is one of the core processes of ceramsite production, which has a great influence on the quality of ceramsite. Especially for the non-sintered ceramsite, because it is no longer roasted, granulation and ball formation becomes its main process. At present, the commonly used granulation method is mainly adopted by pelletizing disc.

Role of pelletizing:

1) It determines the appearance quality of the ceramsite, such as the grain shape and smoothness. A good granulation process can make the ceramsite uniform in size, bright and beautiful, and a bad granulation process, the ceramsite appearance is rough, and the grain size is uneven;

2) Affect the strength of ceramsite: ceramsite will have an early strength after granulation. If this strength is good, the damage rate will be very low during the later conveying and curing process, otherwise, the damage rate will be very high; The ceramsite with good granulation has high compactness, and the late strength is often high. If the granulation is not good, it will cause the ceramsite to be loose, affect the strength of the later stage, and reduce the strength of the ceramsite.

3) Influencing the water absorption rate of ceramsite: the main factors affecting the water absorption rate of ceramsite are the water absorption of raw materials, the performance of the pore former, the quality of pellets, etc.; the quality of pellets is high, the pores are well sealed, and the pores are few and fine. If the granulation quality is not good, the water absorption rate will be very high.

4) Affect the basic quality of ceramsite. In addition to the above-mentioned appearance quality, strength, water absorption, etc., a good ceramsite has a high softening coefficient and good durability. Due to the low water absorption, the frost resistance is also good. If the granulation is formed No, these indicators will be affected, especially durability, will be greatly affected.

Technical requirements for pelletizing:

1) Uniform particle size and consistent size The ceramsite cannot be made with large differences in size and particle size. The size of the ceramsite is consistent, which is beneficial to control the particle size and reduce the sieving.

2) The particle size should be controlled between 5-15mm. The diameter of the ceramsite should not exceed 20mm, preferably between 5-15mm. The ideal particle size is about 10m. Because ceramsite has particle size gradation requirements, between 5-15mm, various particle sizes can be continuously graded according to the standard.

3) Smooth appearance and regular grain shape The appearance of the made ceramsite should have a certain degree of smoothness, be round like beads, not uneven and irregular in shape.

4) The water content should not be too large, and the surface should not be too wet. If the water content is too large and the surface is too wet, it will cause adhesion during curing and agglomerate the ceramsite. Generally, the moisture content of the ceramsite should be controlled at 18% after granulation.

5) Good initial strength The molded ceramsite should have a good initial strength, and it should generally reach about 1m without breaking when it falls on the ground.

6) Good compactness, not loose. Good granulated ceramsite should have a certain degree of compactness and not appear loose, but the density should not be too high, otherwise it will affect the ceramsite bulk density.

7) It can withstand friction, squeezing and impact during transportation without deformation.