What is the industrial production process for NPK fertilizer?

Industrial Production Overview The industrial production of NPK compound fertilizer is a highly automated and standardized process designed to precisely control the ratio of nitrogen, phosphorus, and potassium nutrients while ensuring the product\'s physical properties and chemical stability. Modern NPK fertilizer production plants employ continuous production lines where each step, from raw material processing to final packaging, is carefully designed and strictly controlled. The core advantage of industrial production lies in its ability to achieve large-scale, high-efficiency manufacturing while ensuring product quality consistency and stability. Through automated control systems and strict quality management systems, modern NPK fertilizer plants can produce various formula products that meet the needs of different crops. Core Production Process Raw Material Preparation and Batching Mixing The production process begins with precise proportioning of raw materials. Basic materials such as urea, monoammonium phosphate, and potassium chloride require strict quality testing to ensure nutrient content meets requirements. Automated batching systems use precision measuring equipment to transport various raw materials to mixing equipment according to preset formula ratios. Efficient mixing processes ensure thorough and uniform mixing of all raw materials, laying the foundation for subsequent granulation processes. Granulation Process Granulation is the core link in NPK compound fertilizer production. Drum granulation is currently the most mainstream process, where powdered raw materials gradually agglomerate into uniform particles through rotating drums and precisely controlled steam and binder addition. The pelletizing method is more suitable for producing products containing trace elements or special additives. Regardless of the process used, precise control of granulation temperature, humidity, and rotation speed is key to ensuring particle quality. Drying, Cooling, and Screening Wet particles after granulation need to undergo a drying process to reduce moisture content, preventing product caking or mold during storage. Strict control of drying temperature is crucial, as excessive temperatures can cause nutrient loss. The cooling process ensures product temperature drops to ambient levels, avoiding quality issues after packaging. The screening process classifies products by particle size through multi-layer vibrating screens, ensuring the final product has uniform particle size. Quality Control and Post-treatment