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The Method Of Rotary Drum Granulation

Update time : 2020-09-15 Publisher:Tongda

In principle, each basic fertilizer is firstly screened separately, and the screened material is crushed by a crusher and then screened. The undersieve is sent to their respective hoppers. When the granulation system is in operation, the basic fertilizers are simultaneously sent from their respective hoppers to the feeding hopper through metering equipment, conveying equipment and lifting equipment according to the proportioning requirements. At the same time, the returned material enters the feeding hopper together with the basic fertilizer through the lifting equipment. The basic fertilizers and returned materials are mixed to a certain extent in the process of transportation and lifting, but it is more ideal if a mixing device can be added.The mixture in the feed hopper is fed to the pelletizer at a certain feeding speed. At the same time, saturated steam is properly introduced under the material layer, and the temperature of the material is increased, and the material is slippery and wet, which is beneficial to granulation. If necessary, sprinkle a small amount of water or fertilizer solution on the material to maintain the best liquid phase amount for material granulation. The material forms a rolling material bed by the friction generated by the rotation of the spinning granulator. The extrusion caused by rolling makes the material containing a certain liquid phase agglomerate into small particles. These small particles become the core and adhere to the surrounding powder. Larger particles. Since the stranded granulator generally inclines 1°~2.5° to the discharge end, the pellets roll slowly toward the discharge port while rotating with the cylinder. Qualified pellets leave the conversion granulator and enter the dryer for drying, and then go through screening, cooling, coating, packaging and storage. After being crushed, the screened material is sent to the hopper and the basic fertilizer together with the under-screen material to be granulated at the same time.


The advantage can be transferred to the material layer steam in the strand, which increases the temperature of the granulated material, increases the solubility of the salt in the granulated material, and can achieve a high liquid content under low moisture content to meet the needs of material granulation The amount of liquid phase can also reduce the amount of evaporated water in the drying process. When necessary, ammonia can be passed to the material layer in the conversion to make the material undergo ammonia reaction. Several pieces of soft rubber can be installed on the inner wall of the conversion and on the cylinder. There are pores in the corresponding position. When the lining turns from the bottom to the top with the cylinder at the same time, due to its own weight, the lining sags so that the material adhered to the lining falls due to gravity, which plays the role of automatically cleaning the condensed material. During the process, the operator can observe the granulation of the material at any time, so that corresponding measures can be taken in time as needed to ensure the normal operation of the system and large production volume.


Disadvantages Transforming granulation is not like the disc granulation machine which can classify the particles during operation, so the granulation rate of the transstructuring granulation method is generally only 40% to 60%, which is lower than the granulation rate of disc granulation.

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