Controlling the rotary drum granulator to improve the particle roundness

The time and frequency of material rolling in the rotary drum granulator are the primary factors to determine the pelletizing rate and particle roundness. The roundness of granular product in fertilizer production line can be improved by controlling the drum granulator.

rotary drum granulator
rotary drum granulator

Production principle of rotary drum granulator

Materials rely on surface tension, proper amount of liquid phase, extrusion force generated by rolling between materials, and correct movement direction of materials in the granulator, with small particles as the core, they absorb and adhere to each other and form balls in rolling. In a certain period of time, the higher the rolling frequency is, the higher the spheroidization rate is, and the rounder the particles are.

In the process of production, we have encountered two kinds of situations due to the different friction between materials and the wall of granulator.
1. The internal surface finish of granulator is large, so that the friction force between material and cylinder wall is reduced, and the upward movement force of material is weakened. If the material does not roll, it will not produce particles. In view of this situation, we can solve this problem by adjusting the speed of the granulator and installing a small plate inside.
2. The material in the drum granulator is severely stuck to the wall, and the friction between the material in the granulator and the wall of the barrel is increased, which raises the material in the machine too high, causing the material to fall from the top, so that the formed particles are not Rounding and excessive large particles, we think there are two reasons for this situation: on the one hand, the material is caused by too much viscous material, in this case, we change the formula of the npk production line to reduce the amount of viscous material; on the other hand , The inside of the granulator is not smooth. In this case, we change the internal material to increase the smoothness of the granulator.

On the other hand, we should also control the reasonable amount of material returned to the whole fertilizer production line. The process of rotary drum steam granulation is different from that of general fertilizer granulator, the relative pelletizing rate is lower, and the amount of returned material is higher. The amount of returned material directly affects the output and quality. The product has less particles, more powder and larger amount of return material, which directly affects the output. Large particles return more materials, directly affect the smoothness and roundness of the product.

Water control of drum granulator during granulation

In chemical processing industry, rotary drum granulator is widely used in organic fertilizer production line and NPK fertilizer production line. In the granulation process of the drum granulator, the coarsening in the pellet is mainly in the form of cladding, so the material circulation volume should be larger, so as to provide a coarser core for the cladding process, and the water injection volume should be smaller, so as to reduce the water absorption of the core.

When pelletizing by bonding or “gathering”, the materials are smaller, because the materials in the drum are mainly composed of fresh materials with small particle size and mutual bonding. The liquid ratio required for bonding should be large, because the space between the fine powder particles to be bonded with each other should be filled with water.

Continue reading “Water control of drum granulator during granulation”

Features of rotary drum granulator for processing compound fertilizer granules

The reducer of the drum granulator is driven by a belt driven by a motor. There is a pinion on the reducer shaft, which is exactly in line with the teeth on the ring gear outside the body. The cylinder and the reducer move in opposite directions. In organic fertilizer production line, the materials are sent to the cylinder end of the machine by the silo or conveyor. The granulator makes the materials into granular materials in the cylinder, and the materials conforming to the finished products are discharged from the discharge port at the other end. The continuous operation of the rotary drum granulator can realize the large-scale production of the organic fertilizer production line.

Features of rotary drum granulator

1. Rotary drum granulator can rotate the cylinder with less power. The outside of the machine is made of wear-resistant steel, which effectively prolongs the use time of the equipment.

2. The granulation principle of drum granulator is different from that of roller press granulator, it can make materials roll through chemical reaction. Under the action of certain liquid, using the rolling of cylinder, a sphere is formed by extrusion between material and small particles. Roller granulator is used to extrude particles by external force
rotary drum granulator
3. The machine is supported by the most energy-saving supporting wheel bracket, which is made of high-quality carbon steel and can fully bear the weight of the cylinder. Considering the large friction between the cylinder and the supporting wheel, we specially use more wear-resistant materials in this part. On the one hand, it can improve the safety of the equipment, on the other hand, it can also improve the stability.

4. The transmission device is an important part to provide the main power for the machine. The gear ring on the cylinder is driven by the motor and reducer on the rack. The rack is welded with professional high-quality channel steel which is not easy to deform. The transmission device of the machine is more safe and stable.

Fertilizer Machine Manufacturer Introduces How to Produce Compound Fertilizer Granules

The common granulation processes of compound fertilizer include tower granulation, rotary drum granulation (NPK fertilizer production line), spray granulation and so on. As fertilizer machine manufacturer, let’s introduce these production processes from the perspective of fertilizer production.


  1. High tower granulation process is mainly used for the production of high concentration nitro compound fertilizer. It can directly use concentrated ammonium nitrate solution, eliminating the links of spraying granulation, and granular compound fertilizer eliminates the process of crushing operation. At the same time, the compound fertilizer granules produced by the high tower granulation process are very uniform, the qualified rate is very high, the quality is good, easy to dissolve, and the caking phenomenon will not occur.


  1. Rotary drum granulator has little restriction on compound fertilizer formulation, high production yield, low investment and construction speed. It is favored by investors of small and medium-sized compound fertilizer plants and widely used in compound fertilizer production. The complete drum granulation process is a NPK compound fertilizer production line, which includes fertilizer granulator, automatic batching system, mixer, crusher, drum dryer, drum cooler, coating machine, packaging machine and other equipment.

NPK compound fertilizer production line


  1. The spray granulation process adopts the slurry method. The slurry is sprayed into the equipment by heating and pumping, so that the moisture in the slurry is vaporized and separated, and the retained solid forms a granular compound fertilizer. This kind of process is widely used in large-scale compound fertilizer production. Its advantages are that it can be used to produce NPK compound fertilizer, and can also be used to produce ammonium phosphate compound fertilizer. At the same time, it has less energy consumption, large production scale and low production cost. The quality and strength of the products are very good.


Tianci fertilizer machine manufacturer with many years of experience. The drum granulation NPK compound fertilizer production line is our main equipment product. Among the equipment sold, it is highly praised by many fertilizer factories internationally.

How to Choose Suitable Fertilizer Granulator Machine

Granulating fertilizer with granulator makes it easy to store and sow. It is beneficial to the even distribution of nutrients and slow release the fertilizer efficiency. Different types of fertilizers, different sizes and shapes of fertilizer particles, and different granulators are used.

We can choose the right fertilizer granulator machine according to the specific function of the machine.


Rotary Drum Granulator

Drum Granulator is a larger production version of the disc granulator, make the fertilizer powder into round particles. It is suitable for hot and cold granulation and high, medium and low concentrations of mass production of fertilizer. The shell of the machine uses special rubber slab lining or acid-resistant stainless lining board which realizes auto scar removal and de-tumor instead of traditional drawknife equipment.

fertilizer granulator machine

Disc Fertilizer Granulator

Disc Granulator, also called pan granulator, not only produce organic fertilizer, but also compound fertilizer. The disc bottom adopts multiple steel plates which are firm, durable, not deforming. The granulator’s main gears adopt high temperature quenching technology, doubling the service life. Granulation rate reaches above 93%.

Flat Die Extrusion Pelleting Machine

Flat die extrusion pelleting machine is used for granulation to all kinds of organic matter after fermentation, break through the conventional organic prilling before granulation needs not to dry and crush the raw materials. Pelleting machine can direct burdening to work out cylindrical grain, has better granulation effect on fertilizers containing more straw, can save a lot of energy.

New Type Organic Fertilizer Granulator

This Organic Fertilizer Granulator is used for making granulation of organic matter after fermentation, dedicated to the production of organic fertilizer granules. After fermentation organics don’t need to dry, it process fertilizer powder into granules, the organic content can be high to 100%. The granulator have the feature of simple machine structure, easy operation and maintenance, low power consumption.

Double Roller Press Granulator

Double roller press granulator is often used to manufacture NPK compound fertilizer, such as ammonium choride, ammonium sulphate, ammonium nitrate, diamonium phosphate, potassium Sulphate, magnesium sulfate, magnesium silicate, zinc sulphate, phosphorus pentoxide, etc. This machine diameter of the ball can be made according to the requirement of the customers. The roller press granulator machine have two shaft with one fixed and the other can move, which can adjust the distance between the two shafts, the materials will be extrude between the shafts.

Double Roller Press Granulator

For more information on how to choose granulator machine, please contact us. We are a well-known fertilizer machine manufacturer in China. We have many years of rich experience and we will try our best to give you a detailed answer.

How to Preventing Caking from the NPK Fertilizer Production Process

NPK compound fertilizer is prone to cake because of its strength, moisture content, storage and so on. This article will introduce how to prevent caking from the process operation of NPK fertilizer production process.

NPK fertilizer production equipment produce products with smooth and uniform particles

Non-uniform particles, too many fine particles, non-smooth fertilizer, the compressive resistance, wear resistance is also poor, easy to be compressed and deformed in storage and transportation. The contact area between particles increase, which is easy to agglomerate. In order to produce products with uniform and smooth particle size, appropriate fertilizer granulator machine should be selected. Disc granulator and rotary drum granulator can produce moderate size particles and meet the requirements. If there is a higher requirement for the shape of the particles, it can also be combined with the ball shaping machine to polish the particles to ensure that the shape is qualified.

NPK Fertilizer Production Process

Strengthening the control of screening machine

In order to ensure the consistency of particle size and reduce the caking of powder, the product needs to be screened. According to the particle size of the product, different screens can be selected, and secondary screening can be selected in the process. Pay attention to the material screening in production, timely clean the screen.

Dryer reduces product water content

NPK compound fertilizer has a high water content, which will lead to salt reaction and cause hardening. The higher the water content, the easier the particles to agglomerate. Therefore, the NPK compound fertilizer production line must use a dryer to reduce the moisture content to the allowable range.

After the particle is dried by the dryer, the temperature is higher and the hygroscopicity effect will appear, so it needs to be cooled. The cooler reduces the material temperature to room temperature, and the product can be saved.

Coating treatment is used in NPK fertilizer production process

Choose the suitable material and use the coating machine to coat the particles. At the same time, pay attention to the amount of wrapping agent added. The amount of wrapping agent added is small, the particles are not wrapped completely, the effect is poor; the amount of adding is large, the wrapping oil will infiltrate into the inside of the NPK fertilizer, and the product is easy to cake.

Organic fertilizer production

Different type fertilizer production lines are designed with  the development of the organic fertilizer manufacturing technology ,the different type fertilizer machines are used to produce the organic fertilizer granulator or the compound fertilizer granulator.So what types organic fertilizer machines are used in the fertilizer production line to produce the organic fertilizer granulator?

organic fertilizer production line
Organic fertilizer manufacturing process

In the organic fertilizer manufacturing process ,it is equipped with the fermentation compost turner machine to ferment the organic raw materials,which using the high temperature to kill the bacterial consisting in the raw materials.Then it is equipped with the fertilizer mixer machine and fertilizer crusher machine.Using the fertilizer crusher machine to grind the big and hard raw materials and then put them into the fertilizer mixer machine to mix them with other type additional materials.The fertilizer crusher type we can choose the half wet materials crusher machine to crush the organic raw materials,because this type machine is suitable for the wet materials.And  if it is the large production line,the fertilizer mixer machine we can choose the vertical disc mixer machine to mix the organic raw materials.Next put them into the fertilizer granulator machine which are suitable for producing the organic fertilizer granulator.Now most of time using the disc granulator machine to produce the organic fertilizer granulator.sometimes the rotary drum granulator is also used to produce the organic fertilizer granulator.For different type fertilizer machines inner structure using the different type fertilizer manufacturing method to make the fertilizer granulator.When producing the fertilizer granulator,the fertilizer granulator machine usually it is a factor equipment to produce the granualtor.

The complete fertilizer production line is designed for prroducing the organic fertilizer granulator not only improve the working efficiency,it also simplify the fertilizer manufacturing process  of the organic fertilizer granulator.Using the semi-automatic fertilizer machines also save more labor cost in the organic fertilizer production project.

As the professional fertilizer machine manufacturers,we are not only produce the fertilizer machines,we also design the different type fertilizer production lines,besides the organic fertilizer production line,we also designed the bio fertilizer production line and other type fertilizer production lines.We also supply the customerizes severizes.More fertilizer production lines and fertilizer machines you can kearn from our website.