| 摘要 |
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 C=C·?, 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: Mg+2OH[CO?]?Mg(OH)[MgCO], Ca+2OH[CO?]?Ca(OH)[CaCO]. 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 |
