Graphitized cathode block, used for producing aluminum by electrolytically reducing aluminum oxide in a bath of molten cryolite, is composed of two parts and has a V-shaped profile of its electrical resistance over its length

摘要

Graphitized cathode block is composed of two parts and has a V-shaped profile of its electrical resistance over its length. The resistance has a discontinuity site in the center of the block and increases to the ends so that the ratio of the resistance on the ends of the parts to the resistance in the center is 1.05: 1. An Independent claim is also included for the production of the graphitized cathode block. Preferably the contact surfaces of the parts of the block are connected by mechanical pressing or by using a stamping composition or by adhering the contact surfaces.