Cathode rod comprising a metal sole, for hall-heroult electrolysis cells
US4647356A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1984 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Dec 20, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25C3/16
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention relates to a cathode rod permitting extraction of the current from a cell for the production of aluminum by electrolysis according to the Hall-Heroult process, which is sealed in at least one groove which is open at the base of each of the carbonated blocks 1 forming the cathode of the electrolysis cell. According to the invention, the cathode rod 2 is extended by a metal sole 5 in electrical contact with the base of the carbonated blocks 1 over at least 20% of the total surface area of this base. The sole 5 is constituted by a metal sheet which is at least 4 mm thick and preferably at least 10 mm thick and is soldered to the cathode rod 2 before the carbonated block 1 is positioned in the cell. To prevent infiltration of electrolyte into the subcathode space, the lower face of the sole 5 is placed in a superimposed relationship and in electrical contact with a thick, continuous metal screen 26 arranged at the top of the thermally insulating lining.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.