Fabrication of spinel composites for sidewall of Al Smelter application

A frozen layer of electrolyte is needed to protect the sidewall materials of Al Smelter in the Hall-Heroult process from corrosion. About 35 % of the heat loss is required to form the ledge and therefore, ledge-free sidewall is preferred as it potentially reduces the energy requirement of aluminium production. Potential materials for the ledge-free sidewall, namely NiFe 2O4, NiAl2O4 and MgAl 2O4 and their combinations have been identified in …