The granulation equipment in the NPK fertilizer production line is the core part of the entire production process, used to process mixed powdered raw materials into granules for storage, transportation, and use. Here are some commonly used granulation equipment and their functions in NPK fertilizer production lines:
Disc granulator: This is a classic granulation equipment that works by utilizing the centrifugal force on a rotating disc to condense wet raw material powder into circular particles. It is suitable for granulation of most NPK fertilizers, with high yield and good forming rate.
Squeezing granulator: also known as a drum granulator, extrudes the mixed raw materials through a mold hole under high pressure to form cylindrical or tubular particles, which are then cut into specified sizes by a cutter. This granulation method is suitable for raw materials with good adhesion and is suitable for various industries such as fertilizers and feed.
Spray drying granulator: It is mainly used for direct granulation and drying of liquid or paste like raw materials. The solution is atomized into small droplets through spray devices, and then quickly dried and solidified into particles in hot air. This method is suitable for situations with high requirements for rapid drying, but the cost is relatively high.
Drum granulator: Similar to a disc granulator, but using a rolling cylinder instead of a disc, the raw material rolls and condenses into particles inside the cylinder due to heat. This design is suitable for large-scale continuous production.
Ring mold granulator: compresses the raw material through the pressure between the ring mold and the pressure roller, and extrudes it through the mold hole to form strip-shaped particles before cutting. It is suitable for processing hard and somewhat viscous materials, such as biomass fuels, fertilizers, etc.
Dry granulation machine: It can granulate without adding additional moisture and is suitable for materials that are easily hygroscopic. The material is compacted into blocks by mechanical force and then crushed into the desired particle shape.
The choice of granulation equipment mainly depends on the characteristics of the raw materials and factors such as expected particle shape, hardness, dissolution rate, etc. In actual production, it may be necessary to combine multiple devices to meet complex production needs. Proper matching of equipment specifications and maintenance are crucial for ensuring the efficient operation of NPK fertilizer production lines.
