NPK fertilizer, a compound fertilizer combining nitrogen, phosphorus, and potassium—three core nutrients—is a key input in agricultural production for increasing crop yield and improving quality. The scientific setup of its production line directly determines product quality stability, production efficiency, and market competitiveness. Establishing a compliant and efficient NPK fertilizer production line is not simply a matter of assembling equipment; it requires systematic planning and implementation around five core aspects: preliminary preparation, equipment selection, process design, quality control, and environmental compliance.

Preliminary preparation is the fundamental prerequisite. Market research must be conducted first to determine the nutrient ratio, production capacity, and application scenarios of the target product. Based on the research results, project initiation, site selection, and approval should be completed. Site selection should prioritize locations near raw material suppliers or logistics hubs, and pre-approval from environmental and safety departments is necessary to ensure project compliance.
Equipment selection and process design are core aspects of efficient production line operation, directly determining the smoothness of the NPK fertilizer production process and product quality. The core equipment must form a complete closed loop, including raw material pretreatment equipment (crushers for lumpy raw materials, screening machines to ensure uniform particle size), precise mixing and blending equipment, core granulation equipment (rotary drum granulators are suitable for large-scale production, extrusion granulators are suitable for special formulations), drying and cooling equipment, and finished product screening and packaging equipment. All equipment specifications must strictly match production capacity requirements. The process design must follow the core logic of "precise proportioning—uniform mixing—efficient granulation—drying and shaping—grading and packaging," with a focus on controlling the accuracy of raw material proportions (the error must be controlled within industry standards) and the moisture content during granulation, directly ensuring the uniformity and stability of nutrients in the final product.
Quality and environmental management cannot be ignored. A full-process quality inspection system must be established to monitor key indicators such as raw material purity, mixing uniformity, and finished product nutrient content in real time; simultaneously, environmental protection equipment such as dust collection and wastewater treatment systems should be installed to ensure that exhaust gas and wastewater emissions meet national standards.
Furthermore, personnel training and technological optimization in later stages of operation are also indispensable. Regular professional skills training should be provided to operators to improve equipment operation standards and emergency handling capabilities, reducing human errors. At the same time, a production data traceability system should be established.  By combining actual production capacity data, product quality feedback, and other relevant information, process parameters can be continuously optimized to improve production efficiency and product quality. This will ensure the long-term stable and efficient operation of the production line and the continuous production of high-quality NPK fertilizers that meet market demands.