FIELD: separation of potassium chloride from sylvinite ores.
SUBSTANCE: proposed method includes dissolving of sylvinite, clarification of hot saturated lye, crystallization of product in presence of fluoro-reagents, thickening and filtration of suspension and treatment of non-clarified saturated lye. Clarified saturated lye is treated with hot solution saturated with potassium chloride before crystallization of product. Potassium chloride solution is obtained by dissolving off-grade floatation potassium chloride in water. Off-grade floatation potassium chloride is just cyclone dust, fine fractions of floatation product or filtered-off intermediate product used for forming sludge suspension which is clarified and is thickened after clarification and is directed for treatment of non-clarified saturated lye.
EFFECT: possibility of using off-grade floatation potassium chloride at halurgy plants without impairment of water balance in potassium chloride dissolving-crystallizing processes.
2 tbl, 3 ex
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