US4087375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating radioactive waste water
Assignee: Shin Tohoku Chemical Ind Co Ltd
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Filing: 1976-05-03
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Granted: 1978-05-02
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Expires: 1996-05-03
Abstract
Abstract Corrosive radionuclides, other radionuclides and fission-products contained in the primary cooling water employed in light-water type nuclear reactors and waste water discharged from the reprocessing of neutron irradiated nuclear fuels (both being referred to as radioactive waste water hereunder) can be rendered harmless to man by being adsorbed and captured by mordenite and the mordenite which has captured said nuclides is sintered to a ceramic form, thereby sealing and fixing the nuclides in said sintered mardenite.
Inventors
- 👤 Minoru Tanno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:55
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12; G21C; G21C19/00; G21C19/28; G21C19/30; G21C19/307; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
A process for treating radioactive waste water comprising passing said radioactive waste water through a mordenite column at a velocity of 2-50 cm/min. to adsorb and capture a variety of radionuclides contained therein on said mordenite.
Claim 2
Dependent Claim
36 words
A process for treating radioactive waste water comprising passing said radioactive waste water through a mordenite column at a velocity of 2-50 cm/min. to adsorb and capture a variety of radionuclides contained therein on said mordenite.
Claim 3
Dependent Claim
83 words
A process for treating radioactive waste water comprising passing said radioactive waste water through a mordenite column at a velocity of 3-50 cm/min. to adsorb and capture a variety of radionuclides contained in said waste water, passing through said column an eluant selected from the group consisting of chlorides of alkali metals, sulfates, nitrates, ammonium salts, salts of the element of the copper group and polyvalent metal salts to desorb the radionuclides from the mordenite phase thereby concentrating the same in the eluant.
Claim 4
Dependent Claim
83 words
A process for treating radioactive waste water comprising passing said radioactive waste water through a mordenite column at a velocity of 3-50 cm/min. to adsorb and capture a variety of radionuclides contained in said waste water, passing through said column an eluant selected from the group consisting of chlorides of alkali metals, sulfates, nitrates, ammonium salts, salts of the element of the copper group and polyvalent metal salts to desorb the radionuclides from the mordenite phase thereby concentrating the same in the eluant.
Claim 5
Dependent Claim
56 words
A process for treating radioactive waste water comprising passing said radioactive waste water through a mordenite column to adsorb and capture a variety of radionuclides contained in said waste water, followed by sintering said mordenite to a ceramic form at 1000°-1400° C so that said variety of radionuclides are sealed and fixed in said sintered product.
Claim 6
Dependent Claim
56 words
A process for treating radioactive waste water comprising passing said radioactive waste water through a mordenite column to adsorb and capture a variety of radionuclides contained in said waste water, followed by sintering said mordenite to a ceramic form at 1000°-1400° C so that said variety of radionuclides are sealed and fixed in said sintered product.
Claim 7
Dependent Claim
35 words
A process for treating the primary cooling water employed in the light-water type reactor comprising passing said primary cooling water through a mordenite column at a velocity of 3-50 cm/min to adsorb and capture corrosive
Claim 8
Dependent Claim
35 words
A process for treating the primary cooling water employed in the light-water type reactor comprising passing said primary cooling water through a mordenite column at a velocity of 3-50 cm/min to adsorb and capture corrosive
Claim 9
Dependent Claim
46 words
A process for removing cesium-137 from the cooling water of a nuclear reactor and the drainage from a nuclear reactor, comprising passing said cooling water or drainage through a mordenite column at a velocity of 2-40 cm/min to absorb and capture said Cs-137 by said mordenite.
Claim 10
Dependent Claim
46 words
A process for removing cesium-137 from the cooling water of a nuclear reactor and the drainage from a nuclear reactor, comprising passing said cooling water or drainage through a mordenite column at a velocity of 2-40 cm/min to absorb and capture said Cs-137 by said mordenite.
Claim 11
Dependent Claim
21 words
A process according to claim 5, further including the step of recovering said Cs-137 by means of elution with an eluant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |