METHOD OF OBTAINING POTASSIUM CHLORIDE Russian patent published in 2015 - IPC C01D3/08 C01D3/06 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. To obtain potassium chloride potassium chloride-containing substandard products of flotation production of potassium chloride from sylvinite ore are dissolved in heated solution; as solution used is brine from sludge storage tanks of flotation plants, mine brine, excess sulphite liquors of flotation plants. Discharge of solvents from clayey-salt sludge is clarified. Solution is evaporated on countercurrent evaporation installation with obtaining suspension, liquid phase of which is saturated with potassium chloride and sodium chloride at temperature of its boiling. Suspension is thickened with supply of liquid phase to target product crystallisation under vacuum from clarified solution with separation of crystallisate from mother liquor. Mother liquor is heated and evaporated together with clarified discharge of solvents. Thickened clayey-salt sludge is dumped. As potassium chloride-containing substandard products of flotation production used are: cyclone dust, condensed centrifuge fugates, sludge product from operations mentioned above, fine ore grades.

EFFECT: invention makes it possible to obtain conditioned potassium chloride from production wastes.

2 cl, 1 tbl, 3 ex