METHOD OF PRODUCING GRANULAR POTASSIUM CHLORIDE

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FIELD : chemistry.SUBSTANCE : invention relates to agriculture. The method of producing granular potassium chloride includes removing dust from fertiliser in a fluidised bed, conditioning potassium chloride, which contains alkali-earth metal chlorides, with mineral compounds which bind metal ions into nonhygroscopic products, and cooling, wherein conditioning is carried out at a step of filtering the potassium chloride suspension by washing the potassium chloride precipitate with aqueous solutions of the mineral substance, taken in an amount which provides a washing ratio of 0.5-1.5, wherein concentration of the alkali-earth metal in the liquid phase after washing the precipitate is determined using the empirical formula Ck=Co·?-Ax, and determining equivalent consumption of the alkaline additive from the obtained concentration of the alkali-earth metal chloride in the liquid phase of the filtered precipitate and content of water therein using reaction equations : Mg2++2OH-[CO3?2-]→Mg(OH)2[MgCO3], Ca2++2OH-[CO3?2-]→Ca(OH)2[CaCO3]. The alkaline additive is dissolved in the washing liquid used to wash the precipitate during filtration thereof from the potassium chloride suspension. The obtained solid phase is dried and granulated.EFFECT : invention enables to condition potassium chloride which contains alkali-earth metal chloride on the entire volume of the granulated material, and reduces consumption of the alkaline mineral substance.3 cl, 1 tbl, 4 ex