Sharapova V. Improvement of performance properties of lining materials of aluminium cell due to enhancement of their structural and phase characteristics.

The purpose of this thesis is to improve the period of trouble-free operation of aluminum electrolytic cell lining elements based on the study of degradation of properties of currently used materials and optimization of technical requirements for the lining. Corrosive gaseous electrolysis byproducts influence upon cathode lining material service life has been shown in the work. Reasons for short service life of currently used cathode lining materials under conditions of ZALK have been determined. It has been established that refractory materials with improved macro and microstructure, mechanical and performance characteristics shall be used for aluminum cell lining. Based on the studies carried out alumina-silicate refractory, i.e. blast-furnace dense chamotte with addition of mullite-corundum chamotte and titanium-containing kaolin has been developed and used for refractory layer. Industrial testing of ShPDM-45 refractory material has shown technical expediency of its use allowing to recommend it as a material for the refractory layer of aluminum electrolytic cell lining for bottom blocks containing 50% of graphite.