METHOD OF PREPARING GRANULAR NITROGEN PHOSPHATE FERTILIZER Russian patent published in 2001 - IPC

FIELD: agriculture, more particularly preparation of mineral fertilizer, e. g. ammophos, sulfoammophos and diammophos with zeolite. SUBSTANCE: method of preparing granular fertilizer based on neutralization of phosphoric acid or phosphoric and sulfuric acids with ammonia is carried out by feeding pulp into zeolite granulation and product drying apparatus. In this case, 0.1-3 mm fraction zeolite is introduce without preheating into recycle feeding system, and recycle- zeolite mixture is fed into granulation apparatus at zeolite to pump ratio of (0.1-1):1. Method is more efficient and simple for preparing fertilizer due to reduction of fuel and energy consumption, fewer equipment, smaller amount of zeolite being added, and use of zeolite of finest fraction. EFFECT: more efficient preparation method. 1 dwg, 1 ex, 2 tbl