The working principle and granulation process of the roller extrusion granulator

 The roller squeezing granulator is a commonly used fertilizer granulation equipment, especially suitable for the granulation production of organic and compound fertilizers. The following is a brief introduction to the working principle and granulation process of the roller extrusion granulator:


operational principle

Extrusion molding: The core part of the roller extrusion granulator is composed of a pair of relatively rotating pressure rollers, which have grooves on the surface. When the material is fed between the two rollers, it is compressed to form a strip shape.

Shear cutting: After the extruded strip material passes through the pressure roller, it is usually cut by a fixed or rotating tool to form the required length of particles.

Adjustment control: By adjusting the gap and speed between the pressure rollers, the size and shape of the particles can be controlled.

Granulation process

Raw material preparation: Firstly, suitable raw materials need to be prepared, such as powder of organic fertilizers or mixtures of compound fertilizers.

Moisturizing and mixing: In order to improve the granulation efficiency, the raw materials usually need to be moistened and mixed with an appropriate amount of water and binder to improve their plasticity.

Conveying and feeding: The mixed materials are uniformly fed into the feeding area of the roller squeezing granulator through conveying equipment.

Squeezing: The material is compressed into strips under the high pressure of the pressure roller, and excess water is squeezed out.

Cutting: The extruded strip material is cut or cut into particles of the desired length.

Drying: Newly formed wet particles contain high moisture and require drying treatment through drying equipment to reduce moisture content, improve particle hardness and stability.

Screening and grading: The dried particles are screened through screening equipment to remove particles that do not meet the requirements and ensure product quality.

Cooling: The screened particles usually require further cooling to ensure their stability during storage and transportation.

Packaging: Finally, the qualified granular fertilizer is automatically weighed and packaged before leaving the factory.

The roller extrusion granulator has been widely used in the field of fertilizer granulation due to its advantages of high efficiency, energy saving, and strong adaptability. By optimizing process parameters and equipment maintenance, the production efficiency and product quality of fertilizer particles can be effectively improved.

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