NPK Granulation by Extrusion Technology

1. Without adding any wetting agent, the material is compressed by the pressure of roller granulator to ensure the purity of raw material.
2. The compound fertilizer production line for npk granulation has the advantages of short process, low energy consumption and high yield.

3. The dry powder is granulated directly without subsequent drying process, which is more conducive to the connection and transformation of the existing production process.

4. The increase of bulk density is more significant than other granulation methods. It is especially suitable for increasing the proportion of products.

5. Flexible operation, suitable for a variety of raw materials, high output, low energy consumption, and can adjust the size of extrusion pressure by adjusting the hydraulic pressure.

The compound fertilizer production line is equipped with double roll granulator, which has the advantages of short process flow, low energy consumption and large output. The dry powder is granulated directly without subsequent drying process, which is more conducive to the connection and transformation of the existing production process.

The increase of bulk density is more significant than other granulation methods. It is especially suitable for increasing the bulk density of products. It is flexible in operation and can be used in a wide range. The extrusion force can be adjusted by hydraulic pressure.

How to improve fertilizer nutrient utilization rate?

NPK fertilizer production process

In the production of NPK fertilizer, fertilizer plants usually carry out secondary granulation. The application of organic-inorganic compound fertilizer not only controlled the balanced supply of nutrients, but also controlled the stable release of nutrients.

Rotary Drum Granulation Line 20 ton per hour
Rotary Drum Granulation Line 20 ton per hour

How can it balance fertilization?

It can balance fertilization in the horizontal and vertical directions of nutrients, and improve the utilization rate of nutrients. Granular fertilizer treated by rotary granulator is better than inorganic fertilizer in comprehensive utilization of nutrients.

Rotary drum granulation

In the design of the internal structure of the drum granulator, the function of various internal scrapers is to keep a certain thickness of material on the inner surface of the drum, to make the material layer uniform, and to facilitate the normal rolling and turnover of the material.

Material in the drum

The material in the drum. Steel drums are lined with thermally expandable metal. Rubber baffles and linings, as well as external shock absorbers, are used to prevent accumulation during the drum granulation process. Stable material quantity and uniform liquid phase distribution in rotary drum granulator are the key to produce qualified granules.

Organic NPK Granules Production Technology

Roller granulator is a new dry granulation process for compound fertilizer production. Drying and normal temperature process are not used in production. After molding, the powder material with water content less than 15% is compressed into pieces. After comminution, granulation and screening, the flake material becomes the granular material meeting the requirements of use.
The roller granulator is produced by a process without drying and normal temperature, forming a primary. The equipment has the advantages of less investment, quick effect and good economic benefit.

Double roller npk granulator

Technology of roller granulator

Batching system → crusher → mixer → disc feeder → drum granulator → screening machine → packaging machine.

Go here for more in the NPK Granulation system.

Production technology of compound fertilizer with roller granulator

1. The qualified raw materials are added into the mixer according to the proportion requirements and mixed evenly;
2. In the process of conveying, it is transported to the disc feeder to remove iron from the material;
3. The material in the disc feeder enters the fertilizer granulator evenly, and the material is forced to pass between the two pressure rollers and extrude into a thin plate. The thin plate is broken into pieces by the coarse crusher under the pressure roller, and the materials on the screen continue to be broken and screened;
4. The semi-finished products are transported to the finished product screening machine; after screening, the fine particles are directly returned to the disc feeder; the large particles are crushed by the pulverizer, and then returned to the disc feeder,
5. After screening, the qualified products are transported to the automatic packaging scale for weighing, packaging and storage
The shape and size of the ball on the drum skin can be selected in a wide range according to the needs of users. The spherical shape includes pillow shape, semicircular particle shape, rod shape, ball shape, walnut shape, flat spherical shape and square strip shape. At present, the shape of flat ball is adopted.

Dry Granulation Fertilizer Production Technology

Non drying fertilizer granulation technology is mainly used for products with low water content. Generally, moisture content below 10% is a critical value. (some materials can reach 16%, for example, some contain only crystal water). Some organic fertilizer manufacturing processes have low water content, no need to dry, and save energy.

Dry granulation

The double roller granulator belongs to drying granulation equipment without drying process. It has high granulation density, good fertilizer efficiency and high organic content. The particles are flat and round, suitable for compound fertilizer.

Most of the particles produced by dry granulation are irregular particles (such as ordinary particle size potassium fertilizer), and their shape is similar to the shape of small gravel. The double roller granulator can produce all kinds of high, medium and low concentration NPK compound fertilizer and organic-inorganic compound fertilizer granulation, which meets the requirements of energy conservation and environmental protection.

Fertilizer granulation technology without drying extruder

The dry powder extruder consists of five parts: frame, head, pressure reducer, motor and crusher. It has the advantages of simple structure, high stability, convenient operation and maintenance, and strong adaptability of raw materials.

How to make fertilizer granules by extrusion method?

Roller granulator specially designed for fertilizer manufacturing process. Fertilizer granulator is the main compound fertilizer granulation equipment, which has a broad market in domestic and international markets.

Processing principle of fertilizer roller extruder granulator

Roller extrusion granulator is a kind of drying granulation process which uses pressure to gather solid materials. The material is extruded by two counter rotating rollers, which are driven by an eccentric sleeve or hydraulic system. When extruding the solid material, the air between the powder particles is removed first, and the particles are rearranged to eliminate the gap between the materials.

When the brittle material is extruded, some particles are crushed and the fine powder fills the gap between the particles. In this case, if the newly formed free chemical bonds on the surface cannot be quickly saturated by the atoms or molecules in the surrounding atmosphere, the newly formed surfaces will contact each other and form strong recombination bonds.

When the material is extruded, the particles will deform or flow, resulting in a strong van der Waals attraction. In the extrusion process, the energy formed by pressure forms a hot spot at the contact point between the particles, which leads to the melting of the material, the temperature drop and the material cooling to form a fixed bridge. The thickness of large parts produced by extrusion is 5-20 mm, and the surface density is 1.5-3 times of feed. Large pieces, crushed and screened to obtain the required particles.

Fertilizer roller extruder granulator

The double roller of granulator is the key of fertilizer manufacturing process. The following is a brief description of how to adjust a volume.

1. Adjustment of roller clearance

First, loosen the bolts on the bearing housing, rotate the eccentric sleeve, and adjust it to the required thickness, so that the eccentric sleeve exerts radial force on the drive shaft. When adjusting the gap between the two rollers, the two rollers cannot collide. The minimum value should be maintained between 0.4 and 0.6 mm. Then tighten the bolts on the bearing pedestal.

2. Adjust the ball sleeve accordingly

First, loosen the bolts on the bearing seat, such as the axial dislocation of the ball sleeve, adjust the two eccentric sleeve cover bolts to make the shaft move left and right, so as to adjust the ball sleeve relatively. Tighten the bolts on the bearing housing. If the ball sleeve is not up to right, first release the bolt of the adjusting board, then adjust the top line of the concave part of the adjusting board, so that the reverse shaft can slightly turn to the spherical socket. Then tighten the bolts of the commissioning panel and loosen the top wire for use.