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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2010, Volume 61, Issue 3,





ANA-MARIA POPESCU, VIRGIL CONSTANTIN
Sintering and Behaviour of Tin Dioxide-Based Electrodes

Abstract:

In the present paper we studied the conditions of obtaining sintered ceramic anodes and we tested their behaviour in a laboratory aluminium electrolysis cell. The material chosen for this study consisted of SnO2 doped of the optimum composition from the viewpoint of the densification and electrical conductivities was 96 wt% SnO2 + 2 wt% Sb2O3 + 2 wt% CuO. Starting from the studies of granulometry and the pressability curves, cylindrical electrodes were obtained by isostatic pressing. In order to establish in which case the sintering process was complete, a structural analysis of two samples (S1 and S2) was made by SEM. The fine granulation of the powder for S2 generates a higher grade of compactness by pressing and so a better qualitative synterizing is achieved. In order to observe their behaviour the ceramic materials (S1, S2) were tested in aluminium electrolysis cell. Good results for current efficiency, corrosion, anodic polarization and overvoltage were obtained. Long term aluminium electrolysis has shown that the current and voltage varied in very close limits, which means that those anodes give good results from the point of view of the stability of electrolysis parameter. Keywords: ceramic anodes, inert anodes, sintered oxides, light metal electrolysis


Issue: 2010, Volume 61, Issue 3
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