For NPK fertilizer production, most fertilizer manufacturers are prone to turn powder NPK into pellets. In this process, it is necessary to buy a suitable NPK fertilizer granulator. But how choose an ideal fertilizer pellet making equipment for your NPK fertilizer preparation business plan? As a professional fertilizer machine manufacturer, SX recommend you consider it in three aspects. Scale, cost and material. If you have any other requirements, you can contact us immediately for customization.

Learn more about NPK granulation machines 

What type of equipment is commonly used in small / large NPK fertilizer granulation?

Summarizing the feedback of our past customers, there are two kinds of NPK fertilizer granulators that are popular. Pan pelletizer and rotary drum granulation machine. What is the difference between them? The most obvious difference is that they are commonly used on different scales. For example:

Pan pelletizer for small scale NPK granule manufacturing

If you only plan to start a small scale NPK fertilizer pellets making, we recommend you choose pan pellet machine. A disc granulator can produce 1-6 tons of NPK pellets in an hour. In addition, its granulation rate can reach over 93%. That is, when you use the same amounts of N, P, K to prepare compound fertilizer particles, disc pelletizer can help you granulate more chemical fertilizer powder. There is less material that needs to be returned to re-regulate, so you can finish small scale NPK pelleting effectively.

Drum granulation machine for large scale NPK granulation

But for those who want to produce NPK pellets in a large scale, rotary drum granulator is a better choice. There are two reasons. For one thing, it has a larger capacity, which can reach 30 t/h. So it can help you finish large scale NPK granulation more quickly. For another, this fertilizer machine is designed with rubber lining, angle irons and cleaning holes. They greatly contribute to reducing the possibility of wall sticking. Therefore, drum pelletizer can withstand the erosion of a large amount of chemical materials processing.

How much does NPK fertilizer granulator cost?

In addition, in the process of choosing NPK fertilizer granulator, cost is also an item you must focus on. In general, when you plan to buy disc NPK fertilizer granulator for your fertilizer production line, you need to prepare about $1,000-$16,000 for it. How about drum NPK granulation equipment? The price of a rotary drum pellet making machine is $7,200 and $69,000.

Is there a more economical NPK fertilizer pellet making machine?

You can choose to buy our double roller NPK fertilizer pelletizer. Its quote is usually $3,000-$12,000. It is higher than disc pelletizer, right? However, if you want to setup a NPK fertilizer making line at a low cost, double roller fertilizer granulator will be your best choice. It only needs $25,000-$150,000. Because it adopts dry granulation method, which mainly makes use of extrusion force between two roller to turn powder NPK into granules. This means that there is nearly no water involved in the whole NPK fertilizer making process. So you don’t need to spend money on drying machine and cooling equipment.

How to adjust the pellet size during NPK fertilizer granulation?

Generally, our NPK fertilizer granulators can fully meet your requirements of making 1-10 mm NPK pellets. However, different pellet equipment has different granule size regulation methods.

Disc NPK fertilizer pelletizer

Adjust the moisture content

The higher the moisture content, the larger the size; the lower the moisture content, the smaller the size. Why? The high water content makes materials easier to stick to each other and combine with more materials. So it is easier to roll into larger fertilizer granules.

Pan granulation water spraying
Disc angle adjustment

Change the angle of disc

The sharp the slope, the smaller the size; the slower the slope, the large the size. However, what you need to focus on is that it is advisable to keep the angle of disc between 35° and 55°.

Drum NPK fertilizer pellet making machine

On one hand, you still can regulate NPK pellet size by adjusting the moisture content. On the other hand, you can finish it by changing the rotating speed of drum. The higher the rotating speed, the smaller the size; the lower the rotating speed, the larger the size.

Drum of NPK rotary granulation equipment

Double roller NPK fertilizer granulator

Roller sheets of double roller extrusion granulation equipment

But in the process of double roller extrusion granulation, the NPK granule size is only related to the size of ball sockets on rollers. The smaller the ball socket size, the smaller pellet size; the larger the ball socket size, the larger the pellet size.

Can I make NPK pellet of a diameter of 3mm?

What material can SX NPK fertilizer pelletizers process?

As a professional fertilizer equipment manufacturer, we generally use Q235B boiler steel, which has high erosion-resistance, as material for our NPK fertilizer granulators. So they can be widely used in various N, P, K materials processing. Including urea, ammonium sulfate, DAP, MOP, etc.

NPK fertilizer production materials

How to further process NPK fertilizer after granulation?

If you want to produce high quality NPK fertilizer pellets, there are also many other fertilizer machines you can use to further process NPK fertilizer after granulation. For example:

When you plan to further improve the quality of your NPK granule fertilizer, the first equipment we recommend you is screener. It can sort the NPK pellets into small fertilizer particles, required size NPK granules and large NPK pellets. Then you can send qualified fertilizer particles to the next step while transport unqualified pellets to re-process. This is greatly beneficial for improving the purity of the final NPK fertilizer pellets you prepare.

Then, it is also necessary to purchase a drying machine if you granulate NPK with wet pelletizer (pan granulator and rotary drum pelletizer). This equipment can remove excessive water from NPK fertilizer during production. And after drying, the moisture content can be reduced to less than 10%. Therefore, using rotary dryer in NPK wet granulation process can help you make fertilizer which is more convenient for transportation and storage.

After NPK fertilizer pellets drying, it is advisable to use a rotary cooling equipment. Why? NPK fertilizer drying mainly makes use of high temperature to dry NPK pellets. This will lead to the discharging temperature of fertilizer reaching 30℃-40℃. So it is not suitable to be packaged directly. At that time, NPK rotary cooler can help you reduce the high temperature to a suitable level quickly.

Finally, we can provide you with automatic fertilizer packager. It can pack final NPK fertilizer pellets into 10 kg/bag, 25 kg/bag, 50 kg/bag, etc. Then you can deliver fertilizer to your correspondent scale customers in an easier way.

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