Process for producing aluminum
US3996117A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1974 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Mar 27, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25C3/18
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In a process for producing aluminum, which process conventionally includes electrolytically decomposing alumina to aluminum metal in a molten electrolyte bath between a carbon anode and a cathodic interface formed between a molten aluminum metal pad and sides electrolyte bath, the bath PA1 A. being predominantly NaF and AlF.sub.3, PA1 b. containing CaF.sub.2 and Al.sub.2 O.sub.3, and PA1 C. being covered by a frozen crust, The improvement including providing in the bath 5 to 10 weight-% LiF, while maintaining in the bath a weight ratio NaF to AlF.sub.3 of 1.04 to 1.15, and while maintaining a frozen layer bounding the sizes of the aluminum metal pad and bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.