How is NPK fertilizer granulated?
Granulation is the core process in NPK compound fertilizer production , transforming powdered nitrogen, phosphorus, and potassium raw materials into uniform, spherical granules. The quality of these granules directly influences the fertilizer's appearance, structural strength, dissolution rate, and performance in the field. Huaqiang Heavy Industry’s NPK production lines primarily utilize the rotary drum wet granulation method, while also offering disc granulation and extrusion granulation options to accommodate various production capacities and specific formulations. Before granulation, raw materials must undergo pretreatment. Ingredients such as urea, monoammonium phosphate (MAP), and potassium chloride are crushed and ground into a powder of uniform fineness. They are then precisely measured according to the specific formula and thoroughly blended in a mixer. Some formulations may include binders, such as bentonite, to facilitate the subsequent pelletizing process. Achieving a ...