Method for separating metals such as zirconium and hafnium
US7063792B2 · kind B2 · utility
4Cited by
2References
26Claims
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Key dates
| Filing date | Sep 10, 2001 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Apr 20, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/912
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for separating a metal (a) from a metal (2), preferably zirconium from hafnium, which consists in dissolving said metals in an aqueous solution wherein said metals are in a state preventing them from passing through a nanofiltration membrane; treating the aqueous medium with a ligand, for example EDTA, which is complexed with metal (1) and/or metal (2), then in passing the resulting treated medium on a filtering membrane allowing through the ligand-metal complexes, but retaining the metals not complexed with the ligand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.