The roller extrusion granulator has a unique application in NPK fertilizer production, providing a reliable solution for fertilizer manufacturing with its special granulation principle and performance characteristics.
The roller extrusion granulator mainly consists of a feeding system, a screw extruder, a template, and a cutting blade. The feeding system is responsible for evenly conveying the mixed NPK fertilizer raw materials into the screw extruder. The screw extruder is the core component of the entire equipment, which applies strong extrusion force to the raw materials through the rotation of the screw.
Under the push of the screw, the raw material is gradually compacted in the extruder and extruded through the small holes on the template, forming a continuous strip. After leaving the template, these strips are immediately cut by a high-speed rotating cutter according to the set length, forming regular fertilizer particles one by one.
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The roller extrusion granulator has many outstanding advantages. Firstly, it does not require the addition of additional binders, which is particularly important for the production of NPK fertilizers that are sensitive to binders or require no binder addition. Secondly, the fertilizer particles produced by the extrusion granulator have high strength and are not easily broken. This characteristic enables fertilizers to maintain a good form during storage and transportation, reducing nutrient loss and quality degradation caused by particle breakage. Furthermore, the granulator has strong adaptability and can handle a variety of raw materials with different properties, including some with lower viscosity. By adjusting parameters such as screw speed and extrusion pressure, it is possible to meet different production needs and produce fertilizer particles of different sizes and shapes.
Of course, there are also some shortcomings in the roller extrusion granulator. On the one hand, due to the high pressure on the raw materials during the extrusion process, the equipment wears out relatively quickly, requiring regular maintenance and replacement of key components such as screws and templates, which increases the maintenance cost of the equipment. On the other hand, the production efficiency of roller extrusion granulators may be relatively low compared to some other types of granulators, especially when processing large amounts of raw materials, and production capacity may be limited to some extent. Nevertheless, the roller extrusion granulator still holds a place in the production of NPK fertilizers due to its advantages such as no need for binders, high particle strength, and good adaptability to raw materials. Especially in the production of special fertilizers that require high particle strength and purity, it plays an irreplaceable role.
