METHOD OF REPROCESSING OF A SODIUM-POTASH SOLUTION Russian patent published in 2005 - IPC

FIELD: nonferrous metallurgy; methods of reprocessing of a sodium-potash solution.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to reprocessing a sodium-potash solution produced from a nepheline ore with a low molar index of potassium alkali. The method provides for a concentrating evaporation of the initial sodium-potash solution, a subsequent its evaporation with separation in sediment of monohydrate sodium, separation of a potassium sulfate from a monohydrated soda mother liquor with a dosing in it of a sodium sulfate or sulfuric acid to convert a superfluous in the production process potash into a potassium sulfate, separation from the potassium sulfate mother liquor of the waterless soda polluted with impurities of potash, potassium sulfate and potassium chloride. The waterless soda polluted with impurities of potash, potassium sulfate and potassium chloride is subjected to conversion by a solution a concentrated evaporation at the temperature of 60-70°C within 2.0-3.0 hours with a dosage of 1.2-1.5 m³ of the concentrated evaporation solution per one ton of the waterless soda with production of the monohydrated soda purified from of impurities of a potash, a potassium sulfate and a potassium chloride. The invention allows to reduce a specific consumption of a vapor in the production cycle and the flow of the solution and soda at conversion and separation of monohydrated soda.

EFFECT: the invention allows to reduce a specific consumption of a vapor in the production cycle and the flow of the solution and soda at conversion and separation of monohydrated soda.

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