VERFAHREN ZUR HERSTELLUNG VON ALUMINIUM

A process for producing aluminum by electrolyzing aluminum oxide dissolved in a molten salt bath using a Soderberg anode with vertical contact studs, wherein a molded anode paste having a composition that does not form a soup-like or liquid layer is used, and the electrolysis is carried out while maintaining the anode such that it forms three layers, an upper layer of the anode comprising the molded anode paste which exerts a specific load on lower layers of the anode and has a specific surface temperature, an unbaked interlayer which, for a period of time after pulling out the contact studs does not clog the holes left upon the removal of the studs, and a lower baked layer. The anode has a high apparent density and superior mechanical strength and electrical characteristics, and the process can provide aluminum at low unit production costs for the electrode and electric power without suffering from anode troubles.