Patent US3854933A successfully refreshed from Google Patents.
US3854933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying sodium metal
Assignee: Japan Atomic Energy Agency
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Filing: 1971-06-28
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Granted: 1974-12-17
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Expires: 1991-06-28
Abstract
Abstract A contaminated sodium is advantageously purified by dissolving calcium and/or magnesium and/or an alloy thereof in a molten sodium containing impurities and cooling the molten mixture to separate the impurities together with the added metal or alloy.
Inventors
- 👤 K Furukawa
- 👤 Y Kato
- 👤 H Ohno
- 👤 H Katsuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:28
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A METHOD OF PURIFYING SODIUM METAL USED AS NUCLEAR REACTOR COOLANT AND CONTSMINATED WITH DAMAGED NUCLEAR FUEL AND NUCLEAR FISSION PRODUCTS COMPRISING ELEMENTS SELECTED FROM THE GROUP CONSISTING OF O, N, S, SR, BA, SB, SM, PR, LA, CE, NI, SI, SN, ZN, TL, TH, PU, RH, AND PB WHICH COMPRISES DISSOLVING AT LEAST ONE SPECIES OF METALLIC ADDITIVES SELECTED FROM THE GROUP CONSISTING OF CALCIUM, MAGNESIUM OR AN ALLOY THEREOF IN MOLTEN CONNTAMINATED SODIUM AT A TEMPERATURE OF ABOUT 450*-850*C AND COOLING THE MOLTEN MIXTURE TO A TEMPERATURE A LITTLE HIGHER THAN THE MELTING POINT OF SODIUM METAL TO SEPARATE THE METALLIC ADDITIVES AND THE IMPURITIES CHEMICALLY BONDED THEREWITH, DISSOLVED, OCCULDED OR ABSORBED THEREIN.
Claim 2
Independent Claim
115 words
A METHOD OF PURIFYING SODIUM METAL USED AS NUCLEAR REACTOR COOLANT AND CONTSMINATED WITH DAMAGED NUCLEAR FUEL AND NUCLEAR FISSION PRODUCTS COMPRISING ELEMENTS SELECTED FROM THE GROUP CONSISTING OF O, N, S, SR, BA, SB, SM, PR, LA, CE, NI, SI, SN, ZN, TL, TH, PU, RH, AND PB WHICH COMPRISES DISSOLVING AT LEAST ONE SPECIES OF METALLIC ADDITIVES SELECTED FROM THE GROUP CONSISTING OF CALCIUM, MAGNESIUM OR AN ALLOY THEREOF IN MOLTEN CONNTAMINATED SODIUM AT A TEMPERATURE OF ABOUT 450*-850*C AND COOLING THE MOLTEN MIXTURE TO A TEMPERATURE A LITTLE HIGHER THAN THE MELTING POINT OF SODIUM METAL TO SEPARATE THE METALLIC ADDITIVES AND THE IMPURITIES CHEMICALLY BONDED THEREWITH, DISSOLVED, OCCULDED OR ABSORBED THEREIN.
Claim 3
Dependent Claim
29 words
A method as set forth in claim 1, in which a calcium-magnesium alloy having the melting point in the vicinity of eutectic points in the binary system is employed.
Claim 4
Dependent Claim
28 words
A method as set forth in claim 1, in which the temperature employed to separate the substantial amount of the metallic additive is about 120* - 250* C.
Claim 5
Dependent Claim
31 words
A method as set forth in claim 1, in which the amount of the metallic additive to be employed is about 0.5 - 15 percent by weight of the contaminated sodium.
Claim 6
Dependent Claim
38 words
A method as set forth in claim 1, in which the elements to be removed are those having higher solubilities in calcium and magnesium than in sodium or those forming stable compounds by reaction with calcium or magnesium.
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US3429692A
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US3508907A
Cited
US3600155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |