Working principle and characteristics of double roller granulator for dry granulation

Working principle of double roller granulator

When the double roller granulator works, it is forced to roll the material into shape by two opposite moving roller skins of the granulator. Semi circular spherical cavities are regularly distributed on the two cylindrical roller skins. When the roller skin rotates against each other, the two semicircular cavities just form a complete spherical mold, and the materials inside are forced to be extruded into spherical particles. Due to the continuity of extrusion production, the particles and particles are connected together when they are just extruded, forming a cloth full of particles, which needs to be broken up by the crushing roller and divided into small round particles, and then screened from the screen to select the qualified particles.

double roller granulator

In the production of granular fertilizer by double roller fertilizer granulation machine, it should be noted that the ball socket on the two roller skins should be in good position. If it is not adjusted in place, there will be a certain dislocation during granulation, which can not produce qualified granular fertilizer. In addition, after the formation of particles, they will be released from the ball and socket of roller skin in time, so as to realize continuous production. If the formed particles do not come out in time, complete particles will not be formed, thus affecting the normal production.

Characteristics of double roller granulator for dry granulation
1. There is no drying process in the organic fertilizer granulation machine. It is granulated at room temperature and formed in one time. It has the advantages of less investment, quick effect and good economic benefit.
2. Compound fertilizer double roll extrusion granulator has small power, reliable operation, no waste discharge, stable operation, convenient maintenance, reasonable process layout, advanced technology and low production cost.
3. The material of the roller extrusion granulator is widely used, not only in fertilizer industry, but also in all kinds of chemical raw materials such as snow melting agent.

Environmental protection granulation process of double roller granulator

The double roller granulator uses the way of forced extrusion to make particles, the whole process does not need drying and cooling, and the equipment investment is small. What’s more important is that this granulation method is a very environmentally friendly production mode because it is made of particles by physical methods, and the whole process has no pollution and no waste.

double roller gr

Environmental protection granulation process of double roller granulator

When the double roller extrusion granulator works, it is forced to roll the material into shape by two opposite moving roller skins of the granulator. Semi circular spherical cavities are regularly distributed on the two cylindrical roller skins. When the roller skin rotates against each other, the two semicircular cavities just form a complete spherical mold, and the materials inside are forced to be extruded into spherical particles. Due to the continuity of extrusion production of organic fertilizer granulation machine, the particles and particles are connected together when they are just extruded, forming a cloth full of particles, which needs to be broken up by the crushing roller and divided into small round particles, and then screened from the screen to select the qualified particles.

The fertilizer granulation machine has the advantages of low investment and good economic benefit. The complete set of equipment is compact in layout, scientific and reasonable, and advanced in technology. Energy saving and consumption reduction, no three wastes discharge, stable operation, reliable operation and convenient maintenance. It is suitable for granulation of various raw materials such as compound fertilizer, medicine, chemical industry, feed and so on.

Several basic granulation methods of NPK fertilizer

Mixing granulation of different NPK fertilizers is the core of compound fertilizer processing. Fertilizer production line generally uses the following methods to granulate:

1. Extrusion granulation is a method of making dry powder or wet powder containing binder into cylindrical, spherical or sheet shape by mechanical processing such as extrusion, roller extrusion or pressing. The technology of dry granulation is used in the flat die pellet mill, the ring die pelleting machine and the double roller granulator.

2. Agglomerating granulation, which is under the action of rotation, vibration, agitation and so on, makes the wet powder in motion agglomerate. Or use the fluidized bed to make the material obtain the cohesive force by supplying the spray liquid binder) so as to grow into the appropriate particles. This method is used in disc granulator and rotary drum granulator.

3. Crushing granulation, which is to crush the block material into particles of appropriate size.

4. Melt granulation, which is a method of cooling and hardening molten liquid for granulation.

5. Spray granulation. It is a method of directly forming granules after concentrating the solid in the liquid.

6. The method of crystallization and granulation in liquid phase is to make materials precipitate and crystallize in liquid phase, at the same time, agglomerate into spherical particles by the action of liquid bridging agent and agitation. This technology is widely used in pharmaceutical industry. Because the shape of the particles is spherical, it is also called spherulite granulation, which is called spherulite granulation for short. Spherulite is a kind of spherical particle formed by the crystallization and aggregation of pure materials. It has good fluidity, filling and compression formability. In recent years, the technology has been successfully applied to functional pellets.

granulation machine
granulation machine

Continue reading “Several basic granulation methods of NPK fertilizer”

Fertilizer machine manufacturer introduces reasons for purchasing roller granulator

As a professional organic fertilizer machine factory, our double roller press granulator has the following advantages:

1. Circulation operation, realize continuous production, high output of finished products;

2. The material is compressed by mechanical pressure, without any additives, and the purity of the product is guaranteed.

3. The particle strength can be adjusted, and the finished product strength can be controlled by adjusting the roller pressure;

4. The extrusion granulator is suitable for a wide range of raw materials, and the particle strength can be adjusted freely according to different materials.

5. Compact structure, convenient maintenance, simple operation, short process flow, low energy consumption, high efficiency and low failure rate.

The double roller extrusion pelletizer consists of the following main components: hinged press frame, easy to replace roller components, floating and fixed rollers, main transmission device with reduction gear, feeding equipment, hydraulic pressure boosting system, automatic grease. Enclosed machine housing to minimize the spread of dust.

roller press granulator
roller press granulator

Technical parameters of roller press granulator

The roller pelletizer is a newly developed high-efficiency and energy-saving product in our factory. It has the characteristics of reasonable structure, safety and reliability, convenient use, and output power. The whole Huaqiang fertilizer granulator brand of this machine is divided into DZJ Ⅰ series and Ⅱ series, the power includes 15Kw, 18.5Kw, 22Kw. The output is 1-3 (t/h), and the moisture content of the raw materials is generally controlled at 2%-8%. This model is equipped with a refueling system, which greatly improves the life of the machine.

Comoparsion with disc granulator and roller press granulator

For organic fertilizer machine, granulation is an indispensiable process link in the production line of organic fertilizer. At present,there are many types of equipment for organic fertilizer granulator. Which one is more suitable for producing the organic fertilizer? The comparsion of disc granulator and roller press granulator.

Through the comparsion of the pelletilizer models, the disc granulator and the roller press granulator are different in the granulation production process, so that users have great differences in the selection of these two models. Today, professional organic fertilizer machine manufacturers give you a detailed disclosure of the disc granulator and the roller press granulator which is more suitable for organic fertilizer granulation. And how to choose the suitable fertilizer granulator machine.

disc granulator and roller press granulator
disc granulator and roller press granulator

From the perspective of production process, the two kinds of disc granulator have advantages over the double roller press granulator. From the perspective of production process, the processing technologies of disc granulator and opposite roller press granulator are not too complex. For example, the difference between the two equipment in the granulation appearance process is that the particle size of the disc granulator has high degree freedom, good smoothness and roundness, and the particle size of the roller press granulator is relatvely uniform. But there are defects in the appearance. However, it can be made up by the organic fertilizer rounding machine.

Precautions for installation of two in one NPK fertilizer granulator

Two in one NPK fertilizer granulator is widely used for the granulation of NPK fertilizer and organic fertilizer. Because of its high granulation rate, stable operation, strong and durable equipment, and long service life, it is the first choice of equipment by the majority of users. Its volume is larger than that of the disc granulator and its production capacity is stronger. During the installation, the following items should be paid attention to.

1. Selection of installation location

The two-in-one granulator with rotating agitator teeth shall be installed on the horizontal concrete foundation. For the sake of safety, the granulation equipment shall be further strengthened with anchor bolts. During the installation, the main engine body shall be kept vertical to the horizontal plane. After the installation, further inspection shall be carried out, including whether the bolts of each part have been fixed. If there is looseness, reinforcement shall be carried out in time to ensure that all parts are installed. NPK fertilizer granulator

2. Preparation before operation

When the power supply of NPK fertilizer granulator is configured, it should be selected according to the power of the equipment itself. After checking and confirming that there is no problem, carry out no-load test run. The test run is normal and can be put into production.

3. Equipment use and maintenance

When maintaining the two in one NPK fertilizer granulator, pay attention to the selection of lubricants, because good lubricants have a great impact on the life of the bearing, and the use of inferior lubricants is prohibited. Generally, the parts requiring sealing and oiling include rotating bearing, roller bearing, all gears, movable bearing and sliding plane. Regular and regular inspection shall be carried out. Once problems are found, maintenance shall be carried out in time. If there is abnormal sound during use, production shall be stopped immediately to avoid safety accidents.

Our company has developed and produced internal rotating gear granulator of 60, 80, 100 and other specifications, which can also be customized according to the fertilizer production line and user needs. The shell of pelletizer is made of thickened seamless steel pipe, which is durable and will never deform. In addition, the stable base design makes it run more smoothly.

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.

The working principle of the disc granulator in the fertilizer production line

The disc granulator machine is mainly used in the NPK fertilizer production line and organic fertilizer production line to produce various granular products; it’s also used in pharmaceutical products, fertilizers, feeds, etc. Adopting the overall arc structure, the granulation rate can reach above 93%. The granulation tray has three discharge ports, which facilitates intermittent production operations, greatly reduces labor intensity and improves labor efficiency.

Disc fertilizer granulator machine working principle:
The raw meal powder is uniformly wetted by the atomized water in the mixer to form a spherical core having a uniform particle size, and then fed into a ball plate for ball formation. The moisture of the ball should be controlled at 12-14%. Most of the water should be added in the twin-shaft mixer. Only a small amount of supplementary water is added to the ball plate, and the amount of water added is controlled to be about 0 to 3%. The dry powder granulation is directly added to the ball-forming plate, and the proper amount of water is sprayed. The raw material nucleus enters the spherical disk and is subjected to centrifugal force, friction and gravity in the disk, and moves along the parabola. Due to the cohesiveness and plasticity of the material, the cores are bonded to each other and gradually grow up during the movement. When the inclination angle of the ball disc, the height of the disc edge, the rotation speed and the moisture are constant, the balls of different particle sizes roll downward from the edge of the disc at different disengagement angles due to different gravity. During the continuous rolling process, the ball continuously discharges the water in the ball out of the surface. Due to the cohesiveness of the material and the natural volatilization of the surface liquid film, the ball has certain strength, and then the disk is rotated with the tilting of the disk. The sides are discharged out of the pan.

Disc granulator performance advantages:
1. The raw materials are suitable for a wide range of applications. They can be used for granulation of various raw materials such as compound fertilizer, medicine, chemical feed, coal, metallurgy, etc., and can produce various concentrations and various types (including organic fertilizer, inorganic fertilizer, and magnetic fertilizer etc.) of compound fertilizer.
2. The disc granulator is light in weight, low in height, and flexible in process;
3. The machine has simple structure, convenient adjustment and superior performance.
4. The use of unique unpowered combination scraper integration reduces auxiliary power consumption.

5, high ball formation rate, large rounded particle strength, intuitive operation, easy maintenance and so on.

Fertilizer granulator machine is the core equipment for fertilizer manufacturing process. As one of leading fertilizer machine manufacturers in China, in addition to the disc granulator, we also produce other types of fertilizer granulator machines, and other equipment such as compost turning machines, mixer machine, crusher machine, etc.


Delivery Site of Organic Fertilizer Granulation Production Equipment

Our company has newly exported a set of organic fertilizer equipment, it can realize the production of organic fertilizer fluidized granulation of chicken manure, cattle manure, sheep manure and other animal manure. The organic fertilizer production equipment is granulated by rotary drum granulator and disc fertilizer granulator, and the granules are processed by dryer cooler equipment. Below is the photos of the delivery site


It is more suitable to produce organic manure from livestock and poultry manure by aerobic composting. The traditional composting fermentation of livestock and poultry manure is mainly natural fermentation, which has many disadvantages, such as long cycle, incomplete fermentation, high pollution and heavy odor. It is difficult to adapt to modern life because of its high labor intensity, bad working environment and low labor efficiency. The social development situation of cost and efficient production is also difficult to adapt to the situation of modern ecological recycling agriculture and efficient animal husbandry development. Therefore, it is especially necessary to use high-efficiency organic fertilizer production equipment to accelerate the production of organic fertilizer and improve the production level of organic fertilizer.


Rotary Drum Granulator

Rotary drum granulator machine overcomes many unfavorable factors such as batching, particle forming rate, particle strength, output and cost in the granulation process of disc granulator. Rotary drum granulator has large capacity and low labor intensity, and is suitable for granulation of organic fertilizer, inorganic fertilizer, organic-inorganic compound fertilizer and other fertilizers.

Disc Fertilizer Granulator

Disc Fertilizer Granulator

With poultry manure as organic matter, granulation after crushing can greatly improve the pelletizing rate. Organic fertilizer manufacturing process through half-wet material crusher to crush manure compost, materials into the disc fertilizer granulator before the material through the chain crusher to crush raw materials into appropriate size. The organic fertilizer production process has designed a returning system. After screening, the large particles are pulverized and returned together with the fine powder, which saves labor and energy, and can also improve production efficiency.

Cow manure organic fertilizer production line

The cow manure organic fertilizer production line includes a complete set of equipment. The cow manure organic fertilizer production line uses crops such as straw and rice bran as fillers, and then sprinkle the biological strains through the turner. It is turned over once every 1-2 days. It can be completely decomposed in 7-10 days and made into a national standard organic fertilizer.

cow manure organic fertilizer production line

The technical route for the production of organic manure from cow dung includes two major steps: raw material aerobic composting process and commercial organic fertilizer fertilizing process.

Among them, the aerobic composting process is used in the fermentation process. Modern aerobic composting is a method in which the manure is used to stabilize and harm the cow dung under aerobic conditions by using aerobic microorganisms, and then converted into high-quality fertilizer. Before the composting, the cow manure raw material is pretreated to meet the fermentation conditions such as water and carbon-nitrogen ratio. In the fermentation process, the compost turning machine is used to turn over and accelerate the fermentation speed. After composting, the cow manure can be fermented and then enter the fattening process. According to the need, it can be further processed into powdery organic fertilizer and granular organic fertilizer products, or mixed with chemical fertilizer to make various organic and inorganic compound fertilizer products to realize commercial production. .

The fertilizer manufacturing process requires a crusher, a mixer, a cooling and drying machine, a fertilizer granulator machine, a sieving machine, a packaging machine, a dust removal system, and the like.
1. The pulverizer comprises a half wet material crusher machine;
2. The mixer has an optional horizontal mixer or a disc mixer or a twin-shaft mixer;
3. The dust removal system consists of a settling chamber and a dust collecting room.
4. The cooling and drying system can be used to dry and cool the fertilizer granules.
5. The fertilizer granulator machine has organic fertilizer granulator, disc granulator, drum granulator, etc;
6. The screening system is mainly completed by the drum screening machine, and the first-stage screening machine and the second-level screening machine can be set to make the yield higher and the particles better;
7. The finished packaging system generally includes an electronic quantitative packaging scale, a silo, an automatic sewing machine, and the like. In this way, the batch-free production of the fully automatic cow manure organic fertilizer production line can be realized.

Other article for reference:Common problems in the production of organic fertilizer