Abstract: 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:______________________________________ Al.sub.2 O.sub.3 40-90% AlN 0.1-25% MgO 4-20% SiO.sub.2 0.5-15% CaO 0.1-15% Al (metallic) 0.1-10% Si (metallic) 0.1-10% Fe.sub.2 O.sub.3 0.1-5% C not more than 5% F not more than 5% Na.sub.2 O 0.1-5% K.sub.2 O 0.1-2% TiO.sub.2 0.1-2% Others not more than 5% Loss on ignition not more than 10%.