METHOD OF OBTAINING POTASSIUM CHLORIDE Russian patent published in 2013 - IPC C01D3/08 

FIELD: chemistry.

SUBSTANCE: invention relates to field of chemistry. Potassium chloride is obtained from sylvinite ores by their dilution in heated circulating mother liquor, clarification of discharge of solvents - hot solution, saturated with potassium chloride and sodium chloride, from clay-saline sludge, crystallisation of clarified solution under vacuum and separation of crystallisate from mother liquor, heating mother liquor and its returning for dilution. Excess mother liquor 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 combined with discharge of solvents, combined concentrated saline sludge is output from the process, and combined condensed saline sludge is supplied to crystallisation. Combined saline sludge is discharged into sludge-storage or washed and/or filtered with return of liquid phase into the process.

EFFECT: invention makes it possible to increase extraction of target product with obtaining potassium chloride from sylvinite ores and reduce pollution of environment due to liquidation of liquid wastes of production.

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