Process for the regeneration of a spent solution for pickling zirconium alloy elements
US5788935A · kind A · utility
1Cited by
8References
4Claims
0Family size
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Inventor
Key dates
| Filing date | Jan 24, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Jan 24, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/01
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A substantial part of the water contained in the spent solution is evaporated under vacuum in an evaporator (7) and is then condensed, so as to obtain slightly acidic water and a concentrated acidic solution polluted by zirconium fluoride ZrF.sub.4. The polluted concentrated acidic solution is treated by evaporation under vacuum in a crystallizer (8), so as to obtain zirconium fluoride ZrF.sub.4 crystals and a purified concentrated acidic solution. The slightly acidic water and the purified concentrated acidic solution are mixed in desired proportions in order to obtain a regenerated pickling solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.