GRANULATION METHOD FOR NITROGEN FERTILIZER, METHOD OF MANUFACTURING GRANULAR NITROGEN FERTILIZER, AND GRANULAR NITROGEN FERTILIZER

摘要

PROBLEM TO BE SOLVED: To provide a granulated nitrogen fertilizer that has less burr, high crush strength, high nitrogen concentration, less consolidation amount, and less generation of dust while adding neither water nor anti consolidation agent in granulation.SOLUTION: In a granulation method for nitrogen fertilizer, after nitrogen fertilizer is supplied to a compression granulator, granular nitrogen fertilizer is crushed, granulated, and classified. Granular nitrogen fertilizer favorable for fertilizer can be manufactured by controlling the pocket size S (mm), the granulation pressure P (kN/cm), and the burr thickness T (mm) within a range that satisfies formulas (A), (B), and (C): (A) P0.586+0.482S+3.653T, (B) S5.55-0.0788P, and (C) T0.589+0.152P-0.192S.