Bottom lining for electrolytic cells and process for its manufacture

摘要

A bottom lining for electrolytic cells formed from steel pots for use in primary production and secondary refining, made from a monolithic stamping of a finely granulated powder having a high alumina content, and a process for producing same. The powder is obtained from aluminum industrial scrap recovery and salt slags and has the following components in the following amounts based on dried weight: - Al2O3 40-90% - AlN 0.1-25% - MgO 4-20% - SiO2 0.5-15% - CaO 0.1-15% - Al (metallic) 0.1-10% - Si (metallic) 0.1-10% - Fe2O3 0.1-5% - C not more than 5% - F not more than 5% - Na2O 0.1-5% - K2O 0.1-2% - TiO2 0.1-2% - Others not more than 5% - Loss on ignition not more than 10%. -