METHOD FOR PREPARATION OF ANHYDROUS MAGNESIUM CHLORIDE Russian patent published in 2009 - IPC C01F5/32 

FIELD: chemistry.

SUBSTANCE: invention refers to non-ferrous metallurgy, particularly to production of the anhydrous magnesium chloride from natural magnesium carbonate - magnesite. The anhydrous magnesium chloride is prepared by bubbling of the magnesium chloride melt with chlorine-containing gaseous agent at the melt temperature in the range 725-800°C. The chlorine-containing gaseous agent is gaseous mixture obtained at interreaction of magnesium-containing material with aerified organochlorine waste consisting of polychlorinated biphenyls C₁₂H_10-nCl_n, wherein n is in the range from 1 to 10, in the stream of plasma-supporting gas with following admission of obtained gaseous agent to the magnesium chloride melt. Magnesium-containing material is MgCO₃. The mixture of MgCO₃ and C₁₂H_10-nCl_n is fed to the stream of plasma-supporting gas, the temperature of plasma-supporting gas is maintained equal 8000°C. The waste gases obtained at the bubbling of the melt with chlorine-containing gaseous agent after dedusting are used for heat and electricity generation.

EFFECT: claimed method allows to simplify the technology, to reduce the product cost and to recover the toxic waste materials.

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