How is fertilizer produced?

Fertilizer is produced normally in large amounts. One of the main type of fertilizer production route is through the compound fertilizer production line. The production line is capable of producing up to 5000 to 200000 tons of fertilizer per year. The production line can produce different types of fertilizer based on the different types and concentration of the fertilizer. Main types of fertilizer produced include organic, inorganic, biological and magnetic fertilizer. The fertilizer is normally made into spherical particles with a diameter ranging from 1mm to 3mm.

In the fertilizer production line, there are a few important parts of machine involved. The main parts in the line include automatic batching machine, fertilizer mixing machine, crushing machine, rotary drum granulator, rotary drum drying machine, rotary drum cooling machine, rotary screening machine and auto packaging machine. The fertilizer raw materials, products and other material are transferred from one equipment to another using belt conveyors.


  1. The raw materials are put into the bins based on the exact quantity needed. The conveyor belt sends the material to the crushing machine.
  2. The crushing machine crushes the lumps of materials into small sizes to meet requirement. The conveyor belt then sends the material to the rotary drum granulator machine.
  3. In the rotary drum granulator machine, water pumps pump in gas in order to facilitate the granulating process. In the machine, the solid powder of the fertilizer rises up by rotation of cylinder and scrolls down by gravity. A certain amount of adhesive is added to the cylinder based on the quantity of the material. Gradually, solid particles of fertilizer are formed. In cases where high nitrogen (up to 25 to 45%) fertilizer is to be produced, a nitrogen spraying system is installed in the granulating machine.
  4. The formed particles contain moisture that was added earlier by the water pumps. Therefore, the fertilizer is then sent to rotary drum drying machine to add in hot and cold air to both drying and cooling machines respectively.
  5. Once dried and cooled, the fertilizer then undergoes screening. Screening is an important process where only the fertilizer granules of allowable size is kept. The granules that are too big or small are rejected and reverted back to the crusher or granulator to be reprocessed.
  6. The qualified material from the screening process is then sent to packaging by bucket elevators. The material is then packed and stored for distribution to customers.