C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
C25C 3/08 (2006.01)
Patent
CA 2680087
Disclosed is an aluminum electrolytic cell having profiled cathode carbon blocks, comprising a cell case, a refractory material installed on the bottom, an anodes and a cathode. The cathode carbon blocks include a profiled structure having projections on the top surface of the carbon blocks, that is, a plurality of projections are formed on a surface of the cathode carbon blocks. The aluminum electrolytic cell having the cathode structure according to the present invention can reduce the velocity of the flow and the fluctuation of the level of the cathodal molten aluminum within the electrolytic cell, so as to increase the stability of the surface of molten aluminum, reduce the molten lose of the aluminum, increase the current efficiency, reduce the inter electrode distance, and reduce the energy consumption of the production of aluminum by electrolysis. With the above configuration, compounds or precipitates of viscous cryolite molten alumina can be formed on the lower portion between walls protruding on the upper surface of the cathode, which can prohibit the molten aluminum from flowing into the cell bottom through the cracks and apertures on cathodes, so that the life of the electrolytic cell can be extended.
L'invention porte sur une cellule électrolytique de production d'aluminium comportant une cathode de blocs de carbone de structure hétérotypique. Ladite cellule comprend une coquille d'acier et une base de matériau réfractaire recevant les anodes et la cathode. Les blocs de carbone de la cathode présentent des protubérances sur leur surface supérieure. La cathode permet de réduire la vitesse du flux d'aluminium fondu et l'intensité des turbulences, et par là: d'accroître la stabilité de la surface de l'aluminium en fusion, d'améliorer le rendement du courant, et de réduire la distance entre les électrodes et la consommation d'énergie pendant l'électrolyse de l'aluminium. Par ailleurs, des composés ou précipités visqueux de cryolite fondue peuvent se former sur la base entre les protubérances de la surface supérieure de la cathode, ce qui empêche l'aluminium fondu de s'écouler au fond par les criques et ouvertures des cathodes et prolonge la vie de la cellule.
Northeastern University
Northeastern University Engineering & Research Institute Co. Ltd.
Shenyang Beiye Metallurgical Technology Co. Ltd.
Smart & Biggar
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