Granulador is one of the main equipment for processing finished fertilizer. And in the face of all kinds of granulating machines on the market nowadays, how to choose fertilizer granulator becomes a heated issue for the new investors who are involved in the fertilizer production business. This page will provide references for the initiates in the fertilizer industry.
What Factors Do You Need to Take Into Account in The Selection of A Pelletizer?
Ⅰ. Focus on Granulation Techniques— Dry Granulation vs Wet Granulation
1. Dry Granulation Machines
The moisture of the material is the primary control index for the pelletizing process. Por una cosa, dry granulation manufactures fertilizer pellets with relatively low material moisture. En general, the moisture content is less than 10% as a critical value, and there are very few materials can reach 16%.
Por ejemplo, extrusion granulators (granulador plano y granulador de extrusión de rodillos) apply this method for the production of pellets in variable shapes. Compared with the wet granulation, it has lower energy consumption and equipment cost. Además, it doesn’t require the secadoras or binders to affect the nature of the materials.
2. Wet Granulation Machines
For another thing, wet granulators are equipped with sprinkle system. Además, we greatly recommend conditional fertilizer plants to utilize steam humidification for better granulation effect. Entonces, the following way is hot water granulation, which is superior than cold water granulation.
Más importante, wet granulation refers to the production of fertilizer particles containing 20-40% humedad, which are mostly in the form of balls. Además, wet granulation has a variety of equipment: new type organic fertilizer granulator, rotary drum churning granulator, granulador de disco y rotary granulador de tambor.
Nota: High moisture of materials easily produce big spherical particles, while low moisture obviously cause fertilizer powder loose or sandy and lower granulation rate.
Ⅱ. Focus on Physical Properties of Raw Materials
Generalmente, before granulating, the size of feeding material should be less than 300 meshes which can be pelletized by rotary type granulators, como granulador, granulador de tambor y granulador de disco.
Flat die granulator o rotary roller extrusion granulator can make granules from materials with large size, forming difficulty and great hardness.
Light powder materials, como el estiércol de ganado, polvo de carbón, arcilla, y caolín, require the addition of water or a binder to be formed granules. They can be granulated by a new type organic fertilizer granulator, granulador de disco, o granulador de tambor giratorio. All of these machines have liquid spraying device.
Además, the extrusion granulator is suitable for granulation of non-viscous particles to avoid clinging to the roller sheet and affecting the working situation. Por ejemplo, the equipment can use to dispose crude fiber materials, which are difficult to form with low adhesion, such as sawdust, rice husk, cotton stalks, cottonseed skins, weeds and other crops, straw and plant waste.
Ⅲ. Focus on Finished Products Requirements
1. Fertilizer Category
2. Fertilizer Granular Size
The particle size of the product obtained varies greatly depending on the granulation method. Por ejemplo, rolling granulation commonly make pellets in the small and uneven size, usually 0.3-3mm, como granulador de tambor y granulador. Nevertheless, the extrusion granulator make the size of the particles small and uniform through the mold, generally 2-10mm.
Además, other granulators can change the particle sizes by adjusting different parameters. Let’s take the granulador de disco Como ejemplo!
How to Control The Particle Size of Disk Granulator?
3. Fertilizer Shape
Spherical pellets are processed by disc granulator, new type organic fertilizer granulator y granulador with high granulation rate, but granulador de tambor’s pelleting rate is low, solo 70%. At present, large and medium scale fertilizer production factories mostly use rotary drum granulation machine. There are also some factories will connect disk granulator with granulador de tambor for secondary granulation, with better results.
Flat die granulator produces columnar granules.
Rotary granulador de extrusión de rodillos can make pillow shape, forma de semicírculo, forma de palo, forma de la píldora, forma de nuez, flat ball shape and square bar shape. If you want spherical fertilizer granules, we recommend you to add fertilizante orgánico polishing machine.
Ⅳ. Focus on Capacity
If the output is 1-3 toneladas por hora, we suggest to choose granulador plano o rotary roller extrusion granulator. If you require high effect of granules, you may choose the latter one.
For small production lines with an output of 4-8 toneladas por hora, we recommend choosing granulador o granulador de disco. If you want better effect on the granules, you should choose the former. If you prefer high production efficiency, we advise you to install more than two disc pelletizers because of the low cost.
El peletizante de tambor is generally ideal for professional medium and large organic fertilizer manufacturing plants with output requirements ranging from 9 a 30 toneladas por hora. If you require high capacity and good shape of the pellets, you can choose the rotary drum churning granulator.
En otras palabras, if you own a small or medium scale fertilizer factory with an annual capacity of 5,000-20,000 montones, we propose a high-quality, low-cost granulador plano y granulador de disco. Además, if you run a large fertilizer plant with an annual output of more than 50,000 montones, we recommend purchasing a granulador de tambor giratorio directly. Because it is specifically designed to produce fertilizer granules on a greatly large scale and is more time-saving, efficient, and energy-efficient than several churning granulators working at the same time.
Ⅴ. Focus on Investment Costs
We strongly recommend you to choose flat die pelletizer y roller extrusion pelletizer because they are small in size, save civil construction cost and have good economic efficiency. They produce pellets in room temperature, without dryer and cooler, and have no environmental pollution. Mientras tanto, they have high granulation density, high organic matter content and good fertilizer efficiency.
If you do not have a large budget and have severe environmental protection standards, we recommend that you choose a peletizante de disco, which has a low cost, low civil construction cost, a specific output, and can work more than one at the same time.
En conclusión, when choosing a right granulator, the fertilizer manufacturers need to consider their output and production cost. The granulation production process, in addition to the physical properties of the materials, is also closely related to the type and mechanical features of the granulation equipment.
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