METHOD OF PRODUCING MINERAL FERTILIZER Russian patent published in 2003 - IPC

FIELD: mineral fertilizers. SUBSTANCE: in a method of production of mineral fertilizers containing ammonium salts and potassium chloride, which can be used in manufacture of nitroammophoska-type granulated fertilizers, initial solution containing ammonium salts is evaporated to give pulp, which is mixed with potassium chloride and granulated, after which granules are dried, emission gases are washed with water, and resulting dilute aqueous solution of fertilizer is treated with alkali metal hydroxide and/or carbonate preferably to achieve pH 9.5-10.4. After distilling off ammonia, solution is concentrated, treated with nitric acid to pH 4-9, and returned into pulp granulation stage. EFFECT: improved pulp granulation conditions due to its lowered viscosity and reduced expenses on alkali reagent. 1 tbl, 5 ex