How to Manufacture NPK Fertilizer Granules
NPK fertilizer granules are a type of compound fertilizer that combines the three core nutrients: nitrogen, phosphorus, and potassium. Their granular form offers advantages such as ease of storage and transportation, uniform application, and long-lasting fertilizer effect, making them widely used in various crop cultivation. Their production requires precise proportioning and scientific granulation, with the core process encompassing five main stages: raw material pretreatment, proportioning and mixing, granulation and shaping, drying and cooling, and finished product screening. Raw material pretreatment is fundamental, requiring the selection of high-purity nitrogen, phosphorus, and potassium raw materials and auxiliary materials. Nitrogen sources commonly include urea and ammonium sulfate; phosphorus sources can be diammonium phosphate and superphosphate; and potassium sources often use potassium chloride or potassium sulfate. Auxiliary materials include binders to improve...