METHOD OF DEHYDRATION OF MAGNESIUM CHLORIDE RAW MATERIAL Russian patent published in 2007 - IPC C01F5/34 

FIELD: non-ferrous metallurgy; preparation of magnesium chloride for production of magnesium by molten salt electrolysis.

SUBSTANCE: proposed method includes loading the raw material into multi-chamber fluidized-bed furnace and moving this material through row of horizontal chambers of furnace at conversion of crystalline hexahydrate into dihydrate in second chamber, thus obtaining dehydrated carnallite in third chamber at simultaneous treatment with flue gases containing hydrogen chloride. Crystalline dihydrate is mixed with solid salt of sodium chloride in second chamber of furnace, thus obtaining mixture of dehydrated carnallite and sodium chloride at mass content of water in mixture not exceeding 15-20%. Mixture thus obtained is dehydrated first at temperature of 180-190C and then at temperature of 190-360C.

EFFECT: reduction of power requirements; possibility of obtaining dehydrated carnallite.

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