Process for recycling alkali metal fluorides and/or difluorides
US6458333B1 · kind B1 · utility
1Cited by
7References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2000 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Apr 10, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D3/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a process for recovering alkali metal fluorides and/or difluorides from waste mixtures containing alkali metal chlorides and/or alkali metal fluorides and/or difluorides and, optionally, organic compounds, by(a) subjecting a waste mixture comprising one or more alkali metal chlorides and/or one or more alkali metal fluorides and/or difluorides and, optionally, one or more organic compounds, to a thermal/oxidative pre-treatment and/or an extractive pre-treatment, and(b) bringing the pre-treated mixture into contact with hydrogen fluoride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.