Reduction of aluminum with improved reduction cell and anodes

Abstract

Abstract MINUM FLUORIDE SUSPENDED IN A HIGH MELTING, LOW VOLATILE COAL TAR PITCH. AN IMPROVED POTLINING PROTECTS AGAINST ELECTROLYTE PENETRATION AND CIRCULATING METAL EROSION OF THE POTLINING SURFACE, AND IMPROVES CONDUCTIVITY, THE LININGG BOTTOM IS SEALED AND SMOOTHED WITH GRAPHITE SUSPENDED IN MOLTEN PITCH, WHICH IS ABSORBED BY CAPILLARY ATTRACTION, AND WHICH INCREASES CONDUCTIVITY. THE LINING WALLS ARE SEALED AND SMOOTHED WITH A SIMILAR MIXTURE OF FLUOROSPAR AND PITCH, WHICH DECREASES CONDUCTIVITY. A SYSTEM FOR THE FUSED FLUORIDE ELECTROLYSIS OF ALUMINUM IN A POTCELL WHEREIN A CARBONACEOUS ANODE AND POTLINING ARE PRESERVED AGAINST DETERIORATION BY IMPREGNATING THEIR RESPECTIVE SURFACES WITH A PITCH-FLUORIDE MIXTURE AND A PITCHH-GRAPHITE MIXTURE. ATMOSPHERIC OXIDATION OF ANODE SURFACES IS PREVENTED SO MAXIMUM ANODE CROSS SECTIONAL AREA IS PRESERVED AND, HENCE, HAS MINIMUM RESISTANCE FOR DURRENT TRAVEL THROUGH THE ANODE AND THROUGH THE UNDERLYING ELECTROLYTE. THE MORE DENSE CARBON SURFACE ALSO REDUCES CORNER EROSION OF ANODES. IMPREGNATION IS PREFERABLY CARRIED OUT WITH ONE OR MORE APPLICATIONS OF ALU-

Inventors

• 👤 A Johnson

Bibliographic Details