IMPROVEMENT IN PROTECTIVE COATINGS FOR PRE-COOKED ANODES AND THE EMERGING PART OF THESE ANODES

摘要

P The invention relates to an improvement in protective coatings against corrosion and hot oxidation of prebaked anode logs and of the emerging part of these anodes intended for electrolytic cells for the production of aluminum by the Hall-Héroult process according to claim 1 of the main patent. The coating consists of a mixture of lime aluminate cement with a low content of annoying impurities, having an alumina content at least equal to 70% and magnesium spinel, bound with water, in the following proportions: /P P Lime aluminate cement: 10 - 99.9% /P P Alumina: 0 to 80% /P P Magnesium spinel: 0 to 10% / P P Water: 10 to 80% of the total weight of dry matter. /P