METHOD OF PRODUCING POTASSIUM FERTILIZERS FROM POTASSIUM-CONTAINING ORES Russian patent published in 1998 - IPC

FIELD: concentration of potassium-containing ores; may be used in production of mineral fertilizers. SUBSTANCE: ore is ground to class of 1.25 mm and separated into fine and coarse fractions to class of 0.15 mm. Flotation of potassium chloride from coarse ore fraction is carried out in the presence of additional collector used in the form of fraction of catalytic cracking of oil products with boiling temperature of 310-420 C. Thickening and dissolving of ore fine fraction are carried out in the presence of centrifuged effluent. Crystallization of potassium chloride from fine fraction is effected with addition of cyclone dust. EFFECT: higher degree of recovery of potassium chloride with reduced consumption of reagent and increased quality of concentrate. 1 dwg