What is the working principle of the organic fertilizer roller extrusion granulator

 Organic fertilizer roller extrusion granulator is a device that uses mechanical pressure to extrude powdered or small particle materials into particles with certain strength and shape. Its working principle mainly includes the following steps:

1. Raw material preparation

Firstly, the raw materials (such as cow manure, chicken manure, crop straw, and other organic materials) need to be pre treated, including crushing, mixing, and adjusting the moisture content appropriately to ensure that the materials have appropriate viscosity and flowability for subsequent extrusion granulation.

2. Raw material feeding

The preprocessed raw materials are uniformly fed into the two relatively rotating pressure rollers of the counter roller extrusion granulator through a feeding device. These two pressure rollers usually have high hardness and wear resistance to withstand the high pressure during the extrusion process.

3. Extrusion granulation

When the raw material enters the gap between the pressure rollers, it is compressed under high pressure due to the squeezing effect of the rollers. The intermolecular forces are enhanced, and physical and chemical bonds are formed between the material particles, thereby forming particles with a certain shape and strength. The gap size of the pressure roller can be adjusted according to the required particle size to control the final particle size.

4. Particle Forming and Separation

The extruded material forms a continuous strip or block structure, which is then cut into independent particles by a crushing or cutting device. These particles usually have high strength and stability due to the pressure and viscosity during the extrusion process.

5. Granularity screening

Finally, the particles are screened by equipment to remove particles that do not meet the requirements (such as oversized or undersized particles), ensuring that the final product has uniform particle size.

6. Post processing

The screened particles may also need to undergo post-processing steps such as drying, cooling, and packaging to achieve optimal storage and usage conditions.

The working principle of the roller extrusion granulator is based on the physical properties of the material, which is formed into particles through high-pressure extrusion. This process does not require the addition of additional binders and is suitable for various types of organic fertilizer raw materials. It is one of the key technologies for achieving efficient granulation in organic fertilizer production lines.