Abstract
The degradation of refractory barrier bricks used in the cathode of aluminium electrolysis cells is mainly caused by the chemical attack of fluoride melts and sodium vapour. As the bricks react with the corrosive agents they experience a number of physical and chemical transformations, ultimately impairing the efficiency of the cell operation and even shortening its life.Recent studies on the characterisation of aluminosilicate refractories showed a reasonable correlation between the materials’ permeability and their resistance to a chemical attack. Nevertheless, in all reported cases this property was measured at room temperature, which does not reproduce the real situation. With the aid of newly developed equipment, various experiments were carried out in the present work to investigate how the permeability varied from room temperature up to 700°C, attempting to find a better representation of the actual conditions to which the barrier bricks are subjected. The room and high temperature results were compared and an analysis was presented in order to suggest the best approach for the selection of aluminium cells refractory lining.
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