Dry Granulation Equipment

Dry granulation equipment introduction

Dry granulation equipment is a kind of  fertilizer granulating machine that uses dry granulation method. During this process, there is only a mechanical process that changes the physical properties of the powder material, and no chemical reaction occurs. Therefore, it requires no subsequent drying process, so achieving low energy consumption; and consumes less auxiliary materials, it is beneficial to improve the stability of particles and facilitate storage and transportation. As a professional fertilizer equipment manufacturer, SX designs two dry granulation machines to meet customers’ needs. They are double roller extrusion granulator and flat die pelletizer. You can produce high quality fertilizer granules with them easily.

Double roller granulator for dry granulation
Double roller granulator for dry granulation


What is dry granulation method

In today’s world, there are two most popular granulating methods in fertilizer manufacturing: dry granulation and wet granulation. Dry granulation is a process whereby granules are formed without the aid of any liquid solution. There is only a mechanical process that changes the physical properties of the powder material, and no chemical reaction occurs. It is also a roller extrusion process, which compresses the powdery materials with a moisture content of less than 10% into flakes or blocks. And crushes and sieves to make the flakes and blocks into granular materials that meet the requirements of use.

Flat die pellet making machine for sale
Flat die pellet making machine for sale


Why dry granulation is favoured than wet granulation in fertilizer making line

As mentioned above, both dry granulation and wet granulation are good granulation methods in fertilizer preparation . According to statistics, in the process of fertilizer production, a large part of producers like to use dry granulation method, so why can dry granulation attract them?

  • High-effective: Using dry granulation method can turn dry powder into granules directly without subsequent drying and cooling process, so the process flow becomes simpler, and it can save production time and reduce energy consumption.
  • Highly utilized: Direct granulation of dry powder means low moisture content, so the granules are easy to store, and can remain intact when staying in water for a long time. It will contribute to greatly improving the utilization of materials.
  • Easy to store and transport: No need for any additives, so the finished particles are not easy to agglomerate and stick. It is convenient to store and transport.
  • Adjustable particle strength: The strength of the finished product can be controlled by adjusting the pressure of rollers.
  • Small space required: Compared with other granulating machines, dry granulators require less space. But its capacity never shrinks with size. Then you can enlarge fertilizer output even if your factory is not commodious.
Double roller dry granulation production line
Double roller dry granulation production line


Which equipment is used for dry granulation process

Compared with wet granulation equipment, there are fewer types of dry granulators we can provide you. Only two types: double roller extrusion granulator and flat die pelletizer. Some basic information about them showed for you is as follows:

Double Roller Extrusion Granulator

Double roller extrusion granulator is a hot sale granulating machine for NPK fertilizer production. It has a capacity of 1~3 t/h, and can make granules with a diameter of 3~10 mm. Moreover, it can support the corresponding equipment, forming a small production line to achieve a certain capacity continuous, mechanized production. If you have a special requirement for granule size or shape, it also can meet your needs. It can provide ball socket customization, such as  pillow shape, semicircle shape, stick shape, pill shape, walnut shape, flat ball shape and square bar shape.

Double roller granulator details
Double roller granulator details


Flat Die Pelletizer

Flat die pelletizer plays an important role in various organic substances granulation after fermentation. Its capacity is about 1~2.5 t/h, it is suitable for starting a small scale organic fertilizer production. Moreover, it can combine with a variety of molds. So you can produce columnar particles with different diameters to meet customers’ different needs. The granules processed by this machine not only have smooth surface, moderate hardness, but also can maintain internal nutrients during processing. It is really an economical dry granulation equipment for you.

Granules produced by flat die granulating machine
Granules produced by flat die granulating machine


How does the dry granulator work in your fertilizer production

Although both double roller extrusion granulator and flat die pelletizer adopt dry roller compaction technology, there are some differences between them.

Double roller granulator

There are two rollers with many small ball sockets inside our double roller granulator, and they are on the same level. When you feed the fertilizer powder into the machine, the two rollers will rotate in opposite directions. Then the powder material will be squeezed into particles through the gap between the two rollers. In addition, you need to keep the minimum distance between the two rollers at 0.3-1mm.

Double roller prlletizer working principle
Double roller prlletizer working principle


Flat die pelletizer

Unlike double roller granulator, flat die pelletizer is based on circular motion and extrudes by using rotating extrusion rollers and molds. After the machines set in motion, the fertilizer powder will be pressed in mold holes by rotating rollers, and  turned into long cylindrical pellets. Finally, inner shearing knives will cut them into granules with proper length.

Rotating rollers and molds of plat die granulator
Rotating rollers and molds of plat die granulator


When you choose to use dry pelleting equipment

From the above statement, you must have a certain understanding of dry granulation equipment. So under what circumstances is it better to use dry granulating equipment?

  • If you are granulating with moisture sensitive materials, the dry granulation equipment is a better option. Because the whole process goes almost without water, the moisture sensitive materials will preserve their functionality after the granulation. You can easily achieve it with dry granulation method, but it will be hard to do this by other means.
  • If your fertilizer materials are unable to withstand elevated temperature during drying, using dry granulation equipment is a good way to solve this problem. The powder materials are directly granulated without subsequent drying process. You have no need to worry about high temperature reducing fertilizer quality.
  • If your budget is not high, the dry granulation equipment is also an ideal choice for you. The dry granulator is simple in principle, easy to operate, and its finished granules have low moisture content and no need to dry, so fertilizer manufacturing becomes simpler. It can provide you with a more economical fertilizer production line.


Why choose us from so many dry granulation equipment manufacturers

In addition to determining the type of machine you need, it is also important to choose a reliable company. SX Engineering Equipment Co.Ltd. is absolutely an excellent choice for you because we can provide you with the best service.

  • Before the sale, upon receipt of customers’ information, we will promptly reply through telephone and email. We will provide customers with one-stop professional services, including product inquiry, technical support, product service complaint, warranty, consultation of spare parts, etc.
  • During the sale, we can design a project for you free of charge and guide the installation on site. Ensuring your follow-up production.
  • After the sale, we will follow up and visit irregularly. And understanding the machine operation, production capacity, service condition of wearing parts and other problems encountered by the customer at this stage. Then help them solve the problem immediately and give more technical guidance.
Foregin customer visit
Foregin customer visit


As a professional fertilizer equipment manufacturer, our company will provide you with high quality fertilizer making machines at the best price. Whether you want to build a new fertilizer production line or upgrade an old one, whether you want to start a organic fertilizer production or compound fertilizer factory, you can contact us for consultation.

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