NITROGEN-POTASSIUM FERTILIZER MANUFACTURE Russian patent published in 2004 - IPC

FIELD: mineral fertilizers.

SUBSTANCE: manufacture of fertilizers based on ammonium nitrate and potassium salt comprises stepwise neutralization of nitric acid with ammonia to form concentrated ammonium nitrate solution, addition of potassium-containing solution, evaporation-concentration of resulting solution, and granulation of melt, said potassium-containing solution being product obtained by treatment of industrial-grade potassium carbonate with nitric acid mixed with ammonium nitrate solution, preliminarily neutralized with ammonia and evaporated to residual water no higher than 20 wt %, ammonium nitrate-to-potassium nitrate weight ratio being maintained (3-1):1 and concentration of ammonium nitrate solution used to obtain potassium-containing solution being maintained within a range of 20 to 90%. Thus manufactured fertilizer contains 30.7-33.5% nitrogen and 3.0-9.0% potassium oxide.

EFFECT: increased strength of fertilizer granules and reduced their conglomeration.

4 cl, 3 ex