Recovery of aluminium and fluoride values from spent pot lining
US5352419A · kind A · utility
8Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1993 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Jun 15, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for the recovery of aluminum and fluoride values from spent pot lining materials comprising the steps of calcining spent pot lining material to produce an ash having environmentally acceptable levels of cyanide contamination, subjecting the ash to a leaching step in a solution containing a mineral acid and a corresponding aluminum salt in such proportions as to dissolve the aluminum and fluoride values, and subjecting the leached liquid to thermal hydrolysis to cause precipitation of an aluminum fluoride product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.