The granulation process of NPK compound fertilizer production line usually involves the following key steps, aiming to mix various nutrient raw materials and make easy-to-use granular fertilizers. Here is a basic overview of the process:
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1. Raw material preparation
Raw material measurement: Accurately measure nitrogen (N), phosphorus (P), potassium (K), and other trace nutrients according to the formula.
Raw material crushing: If there are large lumps in the raw material, it is necessary to first use a crusher for crushing in order to facilitate better mixing in the future.
2. Mixing
Use a fertilizer mixer or blender to thoroughly mix all ingredients to ensure even distribution of each component.
3. Granulation
Disc granulator: It is one of the most commonly used granulation equipment, which rolls the mixed raw materials into spherical particles in a rotating disc after adding water or adhesive.
Roll squeezing granulator: suitable for high-density particle manufacturing, it uses pressure to squeeze raw materials through molds to form particles of specific shapes.
4. Drying
After granulation, the particles need to be dried, usually using a hot air dryer or other suitable drying equipment to reduce the moisture inside the particles and avoid deterioration or agglomeration during later storage.
5. Cooling
After drying, the particles are cooled in a cooling tower or air cooler to harden their surface for subsequent processing and packaging.
6. Screening
Use vibrating or rotating screens to grade particle size, removing particles that are too large or too small to ensure consistent particle size in the final product.
7. Covering
(Optional) Some production lines may apply a protective film on the surface of the particles, which can improve the appearance and enhance physical properties such as compressive strength and extend the shelf life of fertilizers.
8. Packaging
The final step is to automatically weigh and package qualified granular fertilizers for easy sales and distribution.
matters needing attention
Strict control of various parameters such as mixing ratio, moisture content, temperature, pressure, etc. is required during the production process to ensure the quality of the final product.
Regularly clean and maintain equipment to ensure efficient operation of production lines and extend equipment lifespan.
The specific design of a small-scale NPK compound fertilizer production line can be flexibly adjusted according to factors such as enterprise scale, raw material characteristics, and market positioning, but the above process provides basic operational guidelines. Manufacturers and engineers should continuously optimize process parameters in practice to improve production efficiency and economic benefits.