METHOD OF OBTAINING CATHODIC UNIT FOR THE ELECTROLYZER FOR OBTAINING ALUMINUM AND THE CATHODIC UNIT

摘要

1. A process for preparing the cathode block, comprising the steps of starting workpiece material containing coke powder and solid material, such as TiBa if necessary carbonaceous material, mixing the starting materials, forming the cathode block, the carbonization and graphitization, as well as cooling, wherein that the graphitization step is performed at a temperature of 2300 to 3000 ° C, in particular from 2400 to 2900 ° C.2. The method of claim. 1, characterized in that the graphitization step is performed at a heating rate of 90 to 200 K / h and / or graphitization at temperatures of 2300 to 2900 ° C.3. A method according to Claim. 1 or 2, characterized in that the coke contains two kinds of coke which, when carbonization and / or graphitization and / or cooling, have different characteristics change obema.4. A method according to claim. 3, characterized in that the cathode block is obtained with a bulk density higher than 1.68 g / cm, in particular higher than 1.71 g / sm.5. A method according to claim. 4, characterized in that the entire cathode block is manufactured as a composite of graphite and solid materiala.6. The method of claim. 5, characterized in that the cathode block is manufactured as a multilayer unit, wherein the first layer comprises a starting material coke and the second layer as a raw material and coke comprises hard material, in particular TiB.7. A method according to claim. 6, characterized in that the first and / or second layer cathode block as the starting material comprises at least one additional carbonaceous material.8. A method according to claim. 7, characterized in that the second layer is produced with a thickness which is 10 to 50%, in particular from 15 to 45%, of the total thickness of the cathode bloka.9. A method according to claim. 8, characterized in that the proportion of graphite and / or graphite