METHOD OF PRODUCING AND MAINTAINING PROTECTIVE WETTABLE COVER ON CARBON BLOCKS OF CATHODE ASSEMBLY OF ELECTROLYTIC TANK FOR ALUMINIUM PRODUCTION Russian patent published in 2008 - IPC C25C3/08 

FIELD: metallurgy.

SUBSTANCE: method of producing and maintaining of protective wettable cover on carbon blocks of cathode assembly of electrolytic tank for aluminium production includes supply of boron containing compounds into electrolytic tank at amount, which ensures contents of boron in liquid aluminium 0.0040-0.0100 wt % for interaction of boron containing compounds with high melting metals and/or with their compounds fed into bath of electrolytic tank, and/or containing in composition of carbon blocks with formation of cover, containing borides of high melting metals; while wettable protective cover is produced and maintained at working condition in process of electrolysis due to interaction of boron adsorbing on carbon blocks with high melting metals and/or their compounds; at that high melting metals are introduced at amount of 5-30 wt % into composition of carbon charge at fabricating of blocks in form of powders for example titanium, zirconium, tungsten and vanadium. Following characteristics are obtained: power efficiency 94-96%, power consumption 12850-13000 kilowatt hour/t, working voltage -3.85-4.0 V, anode density of current 0.99 a/cm².

EFFECT: upgraded characteristics.

5 cl, 2 ex