METHOD OF PREPARING COMPLEX NITROGEN-PHOSPHATE FERTILIZERS Russian patent published in 2001 - IPC

FIELD: preparation of complex granular mineral fertilizers based on ammonium nitrate and phosphoric acid. SUBSTANCE: method comprises ammonation of mixture of phosphoruscontaining component with ammonium nitrate solution having concentration of 89-92%. In this case, phosphorus containing component is extractive phosphoric acid having concentration of 52-54% or monoammonium phosphate solution resulting from ammonation of extractive phosphoric acid having concentration of 30- 42% calculated for P₂O₅ followed by evaporation, granulation of mixture and treatment of granules with anticaking agent. Method makes it possible to prepare nitrogen-phosphate fertilizer containing 31-33% of nitrogen, 4-7% of phosphorus calculated for P₂O₅ and having low moisture content using existing ammonium nitrate production equipment. EFFECT: more efficient preparation method. 1 dwg, 2 ex