US3574531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strontium extraction process
Assignee: United States Atomic Energy Commission
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Filing: 1969-05-15
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Granted: 1971-04-13
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Expires: 1989-05-15
Abstract
Abstract A PROCESS FOR RECOVERING STRONTIUM AND LANTHANIDE RARE EARTH VALUES FROM AN AQUEOUS NUCLEAR REACTOR FUEL REPROCESSING WASTE SOLUTION CONTAINING THESE AND OTHER VALUES BY ADJUSTING THE PH, ADDING A BUFFERING AGENT AND A COMPLEXING AGENT, WHICH WILL COMPLEX ALL CATIONS PRESENT EXCEPT THE ALKALI AND ALKALINE EARTH METALS, TO THE WASTE SOLUTION AND CONTACTING THE AQUEOUS FEED SOLUTION SO OBTAINED WITH AN ORGANIC EXTRACTANT CONSISTING OF DI(I-ETHYLHEXYL) PHOSPHORIC ACID AND DIBUTYL BUTYL PHOSPHONATE IN A HYDROCARBON DILUENT, WHEREBY THE STRONTIUM AND LANTHANIDE RARE EARTH VALUES ARE EXTRACTED.
Inventors
- 👤 Wallace W Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:29
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B3/00; C22B3/20; C22B3/26; C22B3/40; C22B3/408; C22B59/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |