Simple Process to make slow release granular fertilizer

The good application effect of chemical fertilizer largely depends on its physicochemical state. For example, the active component phosphoric acid in calcium superphosphate is the state of calcium phosphate. Soluble in water and can be completely absorbed by plants. However, just because it is a quick acting fertilizer, plants often lose part of it before they can fully absorb it.

In addition, the phosphorylation energy of calcium superphosphate and impurities in soil can not absorb and utilize compounds such as iron phosphate and aluminum phosphate. The smaller the powder of calcium superphosphate, the larger the contact area with soil. Therefore, the greater the amount of compounds that cannot be absorbed by impurities in the soil, the more fertilizer loss. Need machines to make slow release fertilizer granules? Welcome go to

Compost Turner Tunnel Type
Compost Turner Tunnel Type

Because the physical state of slow-release granular fertilizer is solid particles, the above shortcomings can be avoided, nutrient loss can be reduced and fertilizer efficiency can be prolonged. Therefore, in the process of fertilizer manufacturing, the treatment of granulator is very necessary.

Granulation equipment is the most commonly used granulation equipment in the manufacturing process of granular fertilizer

Disc granulator is a well-known fertilizer granulation equipment. The whole is in a swashplate shape. The powdery materials roll in the plate with the bottom of the plate, and the materials adhere to each other to form spherical particles after being affected with moisture. The principle of the granulator is like a snowball. It depends on the viscosity of the material itself to bond and grow.

When the particles grow to a certain extent, they will come out of the plate and enter the next processing process. If the particle size requirements cannot be met, it shall remain in the pan and continue granulation until the requirements are met.

The drum granulator also adopts a similar granulation principle, but the disc granulator is an open structure and the drum granulator is a cylinder, but both are the principle of continuous combination of powdery materials with the help of water.

Granular fertilizer with appropriate particle size. Drum granulator has a wide range of raw materials and can produce organic fertilizer, compound fertilizer and other fertilizers.

7 detailed process to make compound fertilizer

Process design description of NPK fertilizer production line:
1. Batch processing:
Electronic batching or disc batching.
2. Crushing process:
The mixed fertilizer proportioned according to the design requirements is sent to the raw material crusher for raw material crushing. The purpose is to crush various raw materials to a certain fineness. Basically, the particle size of raw materials is less than 1mm, which is conducive to the material in the granulator. Roll inside to meet the standard ball.

20t per hour drum granulation plant layout
20t per hour drum granulation plant layout

3. Granulation process:
The crushed mixture is conveyed to the fertilizer granulator through the conveyor. The liquid phase provided by the slurry or water in the extrusion granulator makes use of the centrifugal force brought by the rotation of the fertilizer granulator to turn the material into organic fertilizer. At present, it is better to use the disc granulator to produce organic fertilizer. The granulation rate of disc granulator can reach more than 90%, but the table output is low.
4. Drying process:
The granular materials are transported to the rotary three drum dryer through the conveyor. The hot blast stove is set at the inlet of the dryer to provide heat for the drying of materials in the dryer and evaporate the water in the formed materials into water. The steam is introduced into the dust collection chamber through the fan to remove dust. After the material enters the dryer, the liquid phase of the material is high and the ball strength is low. In order to ensure the sphericity of the material, we used it in the design of the dryer.
5. Cooling process:
The moisture content of materials after drying generally can not meet the water content requirements of organic fertilizer. Cooling in the cooler is very important for the NPK fertilizer manufacturing process.
6. Screening process:
The cooled organic fertilizer still has a certain temperature. After the organic fertilizer material enters the screening machine, the organic fertilizer material is roughly classified, and the screened fine powder is directly returned to the granulator for granulation. After screening, the screened coarse material is crushed by the return chain crusher, and then returned to the granulator for re granulation. The finished product is directly sent to the silo of the packaging scale. On the other hand, compound fertilizer materials are also used for screening projects. Cooling engineering plays a certain role in reducing temperature and preventing material caking.
7. Packaging process:
The coated finished organic fertilizer enters the silo of the packaging scale, automatically counts according to the set quantity, then puts it into the packaging bag, and then through the automatic sewing system, the sewn compound fertilizer can be stacked in the silo. Warehouse. In principle, the height of each stack shall not exceed 8 bags and the height shall not exceed 10 bags. The ground must be damp proof.

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