METHOD OF PRODUCING GRANULATED NITROGEN FERTILIZER AS COMPOSITION OF TWO OR MORE SUBSTANCES Russian patent published in 1998 - IPC

FIELD: inorganic fertilizers. SUBSTANCE: invention relates to technology of granulated nitrogen fertilizers which constitute composition of two or more different substances such as ammonium nitrate, urea, or nitroammophos, as well as magnesium nitrate, calcium nitrate, ammonium sulfate, potassium chloride, calcium and magnesium carbonates, metal oxides, and aluminosilicates. Invention consists in that solution of nitrogen fertilizer, as one of the product components, is first evaporated. Resulting solution and fine powder of other component are mixed at a specified proportion and mixture obtained in fluid state is granulated. According to invention, initial nitrogen fertilizer solution is evaporated to final concentration as high as 97- 99 wt %, temperature of this solution is maintained 5-15 C higher than its crystallization temperature, and, as one of the fertilizer component, 5 wt % of fine powder is used, its mineralogical composition coinciding with that of zeolite. EFFECT: reduced expenses on fertilizer evaporation and increased fertilizer storage time.