Block, useful in cathode of electrolysis cell, which is useful for producing aluminum, where block has cross section perpendicular to a longitudinal axis of the cathode block and shape of trapezium

摘要

The cathode block having cross section perpendicular to a longitudinal axis of the cathode block and shape of trapezium (12), is claimed. An interior angle formed between one of bases (14) and two legs (16) of the trapezium is 80[deg] . The cross section of the cathode block has an isosceles or symmetrical trapezoidal shape. A ratio between a height of the trapezium and a length of base is 0.4:1-1:1. A ratio between the length of the base and the length of a top side (18) of the trapezium is 1.1:1-3:1. An independent claim is included for a cathode.