It has been established that transformations within the layer of a dry barrier mixture (DBM) are selective in character and are mainly confined to the upper zones of the innermost part (core) of DBM. The DBM layer undergoes a solid-liquid sintering in these zones. The glass phase thus formed prevents the electrolysis products from penetration into the DBM layer. Modifier admixtures — titanium and iron oxides, products of electrolysis and degradation of the refractory layer AlF, SiF4, and sodium oxide — decrease the viscosity of aluminosilicate melt. The grains of a disthene-sillimanite concentrate undergo cracking along the cleavage plane. Imperfections of the crystal lattice promote transformations in the grains of normal electrofused corundum. Oxyfluoride AlOF and an oxyfluoride of variable composition AlOF1 − x are formed in the cathode lining of the electrolysis cell.
Refractories and Industrial Ceramics – Springer Journals
Published: Feb 10, 2006
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