Study of the mineral and phase composition of aluminosilicate refractory ShPD sub(M)-45 after service in an aluminum electrolyzer of OAO Zaporozh'e aluminum combine

Comprehensive studies have established that ShPD sub(M)-45 refractory produced by OAO Zaporozhogneupor exhibits good anticorrosion properties towards the action of electrolysis bath corrosive extraneous components. The degree of degradation of ShPD sub(M)-45 refractory after two years of service is 10%. The average concentration of entry of Na sub(g) and F sub(tot) into ShPD sub(M)-45 refractory through hearth blocks with 50% graphite is correspondingly 4.08 10 super(-4) and 3.32 10 super(-4) g-mole/day. It is established that ShPD sub(M)-45 refractory is a more reliable barrier material than unmolded aluminosilicate mixes. The penetration rate of corrosive components of the electrolysis bath into unmolded aluminosilicate materials is greater by a factor of 10 - 30 than for ShPD sub(M)-45 refractory. It is shown that the protective function of titanium-containing components and glass phase in an electrolyzer lining develops as a result of forming fluoride, subfluoride and oxyfluoride titanium compounds. Industrial approval of ShPD sub(M)-45 refractory under OAO Zaporozhe Aluminum Combine conditions has shown that it exhibits good operating properties in electrolyzers with hearth blocks with 50% graphite