METHOD TO OBTAIN GRANULATED NITROAMMOPHOSKA Russian patent published in 2002 - IPC

FIELD: agriculture. SUBSTANCE: the method deals with obtaining granulated nitroammophoska being a compound NPK- fertilizer. The method includes decomposition of phosphate raw material with a nitric acid to obtain nitric-phosphoric acid infusion, separation of calcium nitrate followed by neutralization of nitric-phosphoric acid solution with ammonia up to pH = 5.0- 5.5, evaporation, mixing the evaporated pulp with potassium chloride, granulation and drying the ready-to-use product. Evaporated pulp is firstly mixed with 60-80% against total mass of potassium chloride for 10-15 min, then the rest amount of potassium chloride is supplemented. It is useful to conduct evaporation up to 8-13% moisture level. EFFECT: improved conditions for granulation, increased product output at higher strength of granules. 1cl, 3 ex