METHOD OF PRODUCTION OF POTASSIUM CHLORIDE Russian patent published in 2003 - IPC

FIELD: inorganic chemistry, chemical technology. SUBSTANCE: method involves dissolving potassium chloride from potassium-containing raw in leaching solution, crystallization of end product from hot cleared solution saturated by potassium chloride in device with controlled vacuum-crystallization, isolation of crystallizer, its drying, heating and recovery of mother liquid for potassium chloride leaching. Moist concentrate with content of KCl > 92% is used as potassium-containing raw. Potassium chloride is dissolved in leaching solution obtained by addition of water to mother liquid up to content of sodium chloride in its 3-6%. Excessive mother liquid is used in preparing concentrate in device with controlled vacuum-crystallization and as washing out waters in isolation of moist concentrate. Invention ensures to obtain product with content of potassium chloride up to 98.8% and sodium chloride >1%. Invention is used for preparing potassium chloride with decreased sodium chloride and other impurities content from potassium-containing raw. EFFECT: improved method of production. 2 cl, 1 tbl