ALUMINUM ELECTROLYTIC CELL HAVING CATHODE CARBON BLOCK WITH COLUMNAR PROTRUSIONS EMBEDDED ON ITS UPPER SURFACE

摘要

An aluminum electrolytic cell in which columnar protrusions are embedded onto the upper surfaces of a cathode carbon block is disclosed, wherein, the cathode carbon block consists of a cathode carbon block substrate and columnar protrusions on the upper surface of the substrate, and the columnar protrusions are embedded onto the upper surface of the cathode carbon block substrate. By embedding columnar protrusions onto the upper surface of the cathode carbon block substrate, it is allowable to have multiple choices for substrate materials of the cathode carbon block and their production methods. There is a merit of making the cathode carbon block with less processing amount and lower cost. The flow speed and fluctuation of the aluminum liquid is remarkably reduced in the electrolytic cell and the cell is normally operated at lower cell voltage.