How to produce granular fertilizer?

Core Production Process Raw Material Pretreatment Raw material pretreatment is the fundamental step to ensure granular quality. Solid materials need to be crushed to 80-100 mesh fineness to ensure uniformity in subsequent granulation. For organic fertilizers, thorough fermentation and maturation must first be completed to eliminate pathogens and insect eggs while controlling moisture within appropriate ranges. Precise material proportioning and thorough mixing are also key tasks at this stage. Granulation and Forming Granulation is the core process in granular fertilizer production. Depending on material characteristics and product requirements, different granulation methods can be selected, including disc granulation, drum granulation, and extrusion granulation. Disc granulation is suitable for small to medium-scale production with simple equipment and flexible operation; drum granulation fits large-scale continuous production with high automation; extrusion granulation is particularly suitable for low-moisture materials without requiring binders. Drying and Screening After granulation, wet granules need to undergo drying to reduce moisture to safe storage levels. Control of drying temperature is particularly important, as excessive temperatures can cause nutrient loss, especially for organic fertilizers. The screening process ensures uniform particle size distribution, with non-conforming granules being reprocessed to improve raw material utilization.