Search the whole station

double roller granulator

Organic fertilizer equipment Roll granulator9240
Double roll granulatordouble roller granulator
Double roll granulatordouble roller granulator
double roller granulator
double roller granulator
double roller granulator

The double roll granulator is the most commonly used granulation and shaping machinery for organic fertilizers. It mainly compresses the material through two relatively rotating roller shafts, causing plastic deformation of the material and compressing it into flakes. Then, the flake material goes through processes such as crushing, granulation, and screening to finally obtain granular products.

Get a free quote
Phone/WhatsApp contact

Table of Contents

If you want to make fertilizer granules without the high cost and energy use of drying, the double roller extrusion granulator is your answer. We at Fude Machinery build this machine because it solves one of the biggest expenses in fertilizer production. This is a dry granulation process. It means you can turn dry powder directly into solid granules at room temperature. You do not need to buy or run a large, expensive rotary dryer and cooling machine. This saves you a huge amount of money on equipment, energy, and factory space. It is a smart and highly efficient way to produce compound fertilizers and other granular products.

Fertilizer granulation process

Opposite roller

Opposite roller

  • Material requirements: The roller granulator has certain requirements for materials, such as high material viscosity which may cause blockage of the roller shaft. Therefore, it is necessary to preprocess the materials or choose a suitable model before use.
  • Maintenance and upkeep: Regular maintenance and upkeep of the equipment is the key to ensuring the normal operation and extending the service life of the roller granulator.

Characteristics and advantages of roller granulator

  1. The roller granulator adopts mechanical pressing for granulation, with high work efficiency and fast granulation speed.
    The particles produced have a regular shape, uniform particle size, and consistent size, which is beneficial for subsequent processing and use.
  2. The roller granulator is pelletized through mechanical pressing and does not produce any chemical reactions or harmful gas emissions, without the need to add any chemicals.
  3. The roller granulator can be suitable for the granulation needs of various materials, including materials with different viscosities and hardness.
Organic fertilizer granulator

Organic fertilizer granulator

Working principle of double roll granulator

The double roller extrusion granulator works by using immense pressure to compact dry powder into a solid form. Two powerful rollers squeeze the material, and a separate part then breaks it into granules. It is a purely physical process.

Think of it like a giant, industrial pasta maker for fertilizer. The process is very direct and simple. We designed it this way for reliability.

  • Feeding: First, you put your dry, powdered raw material into the feed hopper at the top of the machine. The powder must have a low moisture content, usually below 5%.
  • Compacting: The powder is then fed between two large, counter-rotating rollers. These rollers are covered with small sockets or grooves. They apply extreme pressure to the powder, squeezing the air out and forcing the particles to bond together. This forms a solid sheet or cake of material, called a “flake”.
  • Crushing: Next, this solid flake falls from the rollers into a crushing chamber below. A separate rotor in this chamber breaks the flake apart into smaller, irregular-shaped pieces.
  • Screening: Finally, these pieces are sent to a screening machine. The pieces that are the correct size are collected as your final product. Any oversized or undersized pieces are sent back to the hopper to be pressed again.
Organic fertilizer granulator
Roller granulator
Double roll granulator
Double roll extrusion granulator

Parameter table for roller granulator

modelmaterial qualityparticle（mm）power（kw）production（t/h）
DGZ-10stainless steel/carbon steel2-10151
DGZ-15stainless steel/carbon steel2-1018.51.5
DGZ-20stainless steel/carbon steel2-10222
The above configurations are for reference only and can also be customized

Is a Double Roller Granulator Right for You?

This machine is the perfect choice if you are working with dry powdered materials. It is especially good for producing compound fertilizers, NPK fertilizers, and for granulating many types of chemical powders.

The double roller extrusion granulator is a specialized machine. It is not suitable for all materials. It performs best under specific conditions. Here are the businesses that benefit the most from using it:

  • Compound and NPK Fertilizer Producers: This is the most common use. It is excellent for granulating mixtures of dry powders like ammonium sulfate, potassium chloride, urea, and phosphates to create a uniform compound fertilizer.
  • Chemical Plants: Many chemical powders are sensitive to heat or moisture. This room-temperature dry process is ideal for granulating them without changing their chemical properties. We have supplied these machines for products like potassium sulfate and ammonium chloride.
  • BB Fertilizer Manufacturers: It can be used as part of a BB (Bulk Blending) fertilizer plant to granulate the individual powdered components before blending.
  • Organic/Inorganic Mix Producers: It can work well for granulating a mixture of dry, powdered organic material (like fully composted and dried manure) with inorganic chemical powders.
Internal structure of granulator

Internal structure of granulator

How Does It Compare to Wet Granulation?

It is much simpler and cheaper. Dry granulation has fewer steps and uses less energy. However, wet granulation often produces harder, rounder granules. The best choice depends on your product goals and raw materials.

At Fude Machinery, we make both types of machines, so we can give you honest advice. Choosing between dry and wet granulation is a key decision.

The process with a double roller extrusion granulator is very direct:

Powder Preparation -> Mixing -> Granulation -> Screening

The process with a wet granulator (like a disc granulator) is much longer:

Powder Preparation -> Mixing -> Granulation -> Drying -> Cooling -> Screening

Here are the key differences:

  • Moisture: Dry granulation needs very low moisture (<5%). Wet granulation needs much higher moisture (25-30%) to work.
  • Energy: Dry granulation uses very little energy. Wet granulation uses a lot of energy to power the dryer.
  • Granule Shape & Strength: Dry granulation produces harder, irregular-shaped granules. Wet granulation typically produces rounder, smoother, and very strong granules. For many agricultural uses, the shape does not matter as long as the granule is solid.
  • Equipment Investment: The initial cost for a dry granulation line is much lower because you don’t need the expensive dryer and cooler.

If your raw material is already dry, like chemical powders, the double roller machine is the obvious, efficient choice. If your raw material is very wet, like fresh compost, it is often more practical to use a wet granulation method.

Customers order roll granulator

Sent to Indonesia

Sent to Indonesia

Pelletizer sent to Malaysia

Pelletizer sent to Malaysia

Pelletizer sent to Thailand

Pelletizer sent to Thailand

organic fertilizer granules makingmachine

Fertilizer Industry

  • Compound Fertilizer Production: Mixing nitrogen, phosphorus, potassium, and other nutrients according to a formula, then granulating them to produce high-efficiency compound fertilizers with minimal nutrient loss and uniform particle size.
  • Organic Fertilizer Granulation: Processing livestock manure, straw, and other organic materials into high-density, high-strength granules for convenient storage and transportation.
  • Translated with DeepL.com (free version)

Chemical Industry

  • Catalyst Carriers: Producing porous structure catalyst granules to enhance reaction efficiency.
  • Plastic/Rubber Additives: Granulating powdered raw materials to improve flowability and processing performance.

Metallurgical Industry

  • Ore Pellets: Mixing iron ore, manganese ore powder, and binders to form granules, enhancing the permeability and reaction efficiency of blast furnace ironmaking.
  • Waste Residue Recycling: Granulating metallurgical waste residues to enable reprocessing and recycling.

Biomass Energy

  • Biomass Pellet Fuel: Converting wood chips, rice husks, and other raw materials into high-density pellets to replace coal for heating and power generation, thereby reducing greenhouse gas emissions.

    Organic fertilizer granulator

    Organic fertilizer granulator is a specialized equipment used to granulate various organic compounds after fermentation. It has a variety of types, including double roll granulator, disc granulator, toothed granulator, drum granulator, compound fertilizer granulator, and round granulator, each with its own characteristics, suitable for different production needs and scenarios.

    Roller granulator

    Disc Pelletizer

    Disc Pelletizer

    Compound fertilizer granulato

    Compound fertilizer granulato

    Stirring toothed granulator

    Stirring toothed granulator

    Round pelletizer

    Round pelletizer

    Rotary Drum Granulator

    Rotary Drum Granulator

    Frequently Asked Questions (FAQ)

    Question 1: What is the required moisture of the raw material?
    The raw material must be a dry powder. The ideal moisture content is below 5%. If the moisture is too high, the powder will stick to the rollers and will not form a solid flake. Your material may need to pass through a crusher 3 first.

    Question 2: What shape are the granules? Can I change the shape?
    The standard granules are irregular or flake-like in shape. By changing the shape of the sockets on the roller surface, you can produce different shapes, such as pillow shapes or flat bar shapes. However, it cannot produce perfectly round spheres.

    Question 3: Is this machine good for pure organic fertilizer?
    It is generally not the first choice for pure, composted organic fertilizer. This is because organic compost is often sticky and has a higher moisture content. For pure organic materials, we usually recommend a wet-type machine like our new type organic fertilizer granulator.

    Question 4: What is the main maintenance task for this machine?
    The main wear part and maintenance task is checking and eventually replacing the rollers. They are made from extremely hard, wear-resistant alloy steel, but they will slowly wear down after processing many thousands of tons of material. We have designed the machine for easy roller replacement.

    Organic fertilizer manufacturingequipment

    The organic fertilizer production line is a production system that integrates the steps of raw material collection, pretreatment, fermentation, granulation, drying, screening, packaging, etc. It can convert organic waste such as aquaculture waste, crop straw, and food processing waste into organic fertilizers rich in nutrients for agricultural production.

    The double roller extrusion granulator is a highly efficient and cost-effective machine for any business working with dry powdered raw materials. Its greatest strength is its ability to produce granules without the need for a costly and energy-intensive drying process. This saves you money on your initial investment, reduces your daily operating costs, and simplifies your entire production line. It is the ideal technology for manufacturing compound NPK fertilizers and granulating a wide range of chemical products.

    Introduction to Fude Machinery Company

    The production equipment includes: fermentation raking machine, dryer, granulator, crusher, mixer, round throwing machine, organic fertilizer production line, etc. The company will continue to adhere to the business philosophy of “quality first, customer first” and provide higher quality metal equipment solutions for global customers.
    Since its establishment in 2015, Fude Machinery has been committed to providing high-quality and high-performance metal equipment solutions to global customers. With advanced production technology, strict quality control, and continuous innovative research and development capabilities, we have received customer satisfaction praise.

    The prev: The next:

    Related recommendations