How to use rotary drum pelleting machine to make 17:17:17 npk fertilizer


Rotary drum pelleting machines, also known as rotary granulators, are widely used in the fertilizer industry for the production of granular fertilizers. These machines offer a simple, efficient, and cost-effective method to produce high-quality NPK (nitrogen, phosphorus, potassium) fertilizers. This guide will take you through the entire process of using a rotary drum pelleting machine to produce 17:17:17 NPK fertilizer, ensuring a balanced nutrient supply for crops.

npk fertilizer pellets granulating line

npk fertilizer pellets granulating line

Understanding the Basics

What is a Rotary Drum Pelleting Machine?

A rotary drum pelleting machinery consists of a large, rotating cylindrical drum. Inside the drum, powdered or finely ground fertilizer materials are combined with a binding agent and agitated to form granules. The rotation of the drum, combined with the addition of moisture and sometimes heat, allows the particles to stick together and form uniform, spherical granules.

Why Choose 17:17:17 NPK Fertilizer?

The 17:17:17 NPK fertilizer formulation provides a balanced ratio of nitrogen (N), phosphorus (P), and potassium (K), each at 17% by weight. This balanced composition is ideal for general-purpose use, ensuring that plants receive equal amounts of all three essential nutrients, which promotes healthy growth, strong root development, and robust flowering and fruiting.

Preparing the Raw Materials

Selecting the Raw Materials

To produce 17:17:17 NPK fertilizer, you will need three primary raw materials:

– **Nitrogen Source**: Common sources include urea, ammonium nitrate, or ammonium sulfate.
– **Phosphorus Source**: Diammonium phosphate (DAP) or monoammonium phosphate (MAP) are typical choices.
– **Potassium Source**: Potassium chloride (muriate of potash) or potassium sulfate.

Weighing and Mixing

Accurate weighing and mixing of the raw materials are crucial to achieving the desired 17:17:17 ratio. Use a precision scale to measure each component and mix them thoroughly in a large container or a mechanical mixer until you obtain a uniform blend.

Operating the Rotary Drum Pelleting Machine

Feeding the Material

Feed the mixed raw materials into the rotary drum pelleting machine through the feed hopper. The feeding rate should be consistent to ensure uniform granulation. Some machines may have adjustable feed rates to accommodate different material properties and production requirements.

Adding Moisture and Binding Agents

Inside the drum, the addition of moisture is essential for the granulation process. Water is usually sprayed into the drum to achieve the desired moisture content, typically between 20-30%. A binder, such as lignosulfonate or bentonite clay, may also be added to enhance the binding properties of the granules.

Adjusting the Machine

Set the rotation speed and angle of the drum according to the manufacturer’s recommendations for NPK fertilizer production. The drum’s speed and angle affect the time the materials spend in the drum, the size of the granules, and the overall efficiency of the process.

Granulation Process

As the drum rotates, the combination of moisture, binding agents, and centrifugal force causes the powdered materials to stick together and form granules. Continue the process until the granules reach the desired size, usually between 2-5 mm in diameter. The time required for granulation can vary but typically ranges from 15-30 minutes.

Post-Production Steps

Drying the Granules

Once granulation is complete, the granules need to be dried to reduce their moisture content and increase their stability. Use a drying machine or a drying oven to achieve a final moisture content of around 1-5%. Proper drying prevents the granules from clumping and enhances their shelf life.

Screening and Sizing

After drying, the granules should be screened to ensure uniform size. Use a vibrating screen or a sieve to separate oversized and undersized particles. Recycle the oversized particles back into the rotary drum for further granulation, while the undersized particles can be added to the raw material mix for the next batch.

Cooling the Granules

Cooling the granules is an important step to maintain their structural integrity and prevent moisture absorption. Use a rotary cooler or an air-cooled conveyor to reduce the temperature of the granules to ambient levels.

Coating the Granules (Optional)

Applying a coating to the granules can improve their flowability and prevent clumping during storage and transportation. Common coatings include anti-caking agents or polymer coatings. This step is optional but recommended for high-quality, commercial-grade fertilizers.

### Packaging and Storage

Once the granules are cooled and coated, they are ready for packaging. Use automated packaging machines to fill bags or containers with the 17:17:17 NPK fertilizer. Ensure that the packaging is airtight and moisture-proof to preserve the quality of the fertilizer. Store the packaged fertilizer in a cool, dry place away from direct sunlight and moisture.


Producing 17:17:17 NPK fertilizer using a rotary drum pelleting machine involves several precise steps, from selecting and mixing raw materials to granulation, drying, screening, cooling, and packaging. By following this guide, you can ensure a consistent, high-quality product that provides balanced nutrition for a wide range of crops. Remember, the key to successful fertilizer production lies in meticulous preparation, careful operation of the machine, and proper post-production handling. This balanced approach not only maximizes the efficiency of your production process but also ensures the creation of a fertilizer that meets the nutritional needs of your crops. Visiting:

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