METHOD OF PRODUCTION OF THE SYNTHETIC CARNALLITE Russian patent published in 2007 - IPC C01F5/30 C01D3/04 

FIELD: nonferrous industry; chemical industry; methods of production of the synthetic carnallite for the electrolytic production of magnesium and chlorine.

SUBSTANCE: the invention is pertaining to the method of production of the synthetic carnallite for the electrolytic production of magnesium and chlorine and may be used in the nonferrous metallurgy and chemical industry. The method of production of the synthetic carnallite provides for dissolution of the spent electrolyte containing the magnesium chloride, potassium chloride, sodium chloride in the mother liquor of production of the carnallite up to the complete dissolution of the potassium chloride at the temperature of 90-115°С with the following filtration for separation of the non-dissolved sediment containing sodium chloride and production of the clarified carnallite-saturated solution. From the received solution the carnallite is crystallized by refrigeration with the speed of 17-25°С/h. The produced suspension is thickened and filtered for separation of the mother-liquor from the carnallite. The carnallite is dehydrated, dried and returned for intercalation in the dehydrated carnallite. The invention allows to produce the synthetic carnallite of the bigger size and with the low share of impurities.

EFFECT: the invention ensures production of the synthetic carnallite of the bigger size and with the low share of impurities.

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