METHOD OF REPROCESSING OF THE DUST WASTES FORMED AT DEHYDRATION OF THE CHLORINE-MAGNESIUM RAW MATERIALS Russian patent published in 2006 - IPC C01F5/34 C25C3/04 

FIELD: non-ferrous metallurgy; methods of reprocessing of the.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, namely, to dehydration of the chlorine-magnesium materials (carnallite) for the electrolytic production of magnesium, in particular, to reprocessing of the dust wastes trapped in the cyclones and gas ducts. The method of reprocessing of the dust wastes formed at the dehydration of the chlorine-magnesium materials provides for feeding of carnallite into the furnace boiling bed, its dehydration, the dust trapping in the cyclones, extraction of dust from the cyclones and its return to the stage of the dehydration, extraction of the dust waste from the pipe ducts. Dust wastes after extraction from the pipe ducts are wash out in the reactor by water, treat with the solution of sodium carbonate with production of the suspension the magnesium hydrocarbonate. The suspension is fractionated for the solid magnesium hydrocarbonate and the filtrate. The magnesium hydrocarbonate is annealed with production of the commercial magnesium oxide, and the filtrate is heated up to formation of the solution saturated with potassium and sodium chlorides. Crystallize it and dry with production of potassium chloride and sodium chloride. The invention allows to produce as the commercial products - potassium and sodium chlorides, alongside with the magnesium oxide.

EFFECT: the invention ensures production as the commercial products of potassium and sodium chlorides, alongside with the magnesium oxide.

6 cl, 1 ex