US4483789A
Expired / Lapsed
US
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Method for permanently storing radioactive ion exchanger resins
Assignee: Karlsruher Institut für Technologie
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Filing: 1983-07-15
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Granted: 1984-11-20
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Expires: 2003-07-15
Abstract
Abstract A method for forming a hardened product containing a radioactive ion exchanger resin in a condition for permanent, noncontaminating storage, by the steps of: providing, before fixing, a mass of such ion exchanger resin saturated in water, the resin being at least one resin selected from the group consisting of spherical resins and powdered resins; mixing the resin mass, with stirring, with a blast furnace cement having a composition which causes it to exhibit slow initial hardening, high sulfate resistance and low hydration heat and with a quantity of additional water equal in weight to 20% to 40% of the weight of the blast furnace cement; and allowing the resulting mixture to harden at room temperature.
Inventors
- 👤 Siegmar Kunze
- 👤 Gerhard Eden
- 👤 Rainer Koster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:14
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/16; G21F9/162; G21F9/165; G21F9/28; G21F9/30; G21F9/301; G21F9/302; G21F9/304
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
113 words
A method for forming a hardened product containing a radioactive ion exchanger resin in a condition for permanent, noncontaminating storage, comprising: providing, before fixing, a mass of such ion exchanger resin saturated in water, the resin being at least one resin selected from the group consisting of spherical resins and powdered resins; mixing the resin mass, with stirring, with a blast furnace cement having a composition which causes it to exhibit slow initial hardening, high sulfate resistance and low hydration heat and with a quantity of additional water equal in weight to 20% to 40% of the weight of the blast furnace cement; and allowing the resulting mixture to harden at room temperature.
Claim 2
Independent Claim
113 words
A method for forming a hardened product containing a radioactive ion exchanger resin in a condition for permanent, noncontaminating storage, comprising: providing, before fixing, a mass of such ion exchanger resin saturated in water, the resin being at least one resin selected from the group consisting of spherical resins and powdered resins; mixing the resin mass, with stirring, with a blast furnace cement having a composition which causes it to exhibit slow initial hardening, high sulfate resistance and low hydration heat and with a quantity of additional water equal in weight to 20% to 40% of the weight of the blast furnace cement; and allowing the resulting mixture to harden at room temperature.
Claim 3
Dependent Claim
25 words
A method as defined in claim 1 wherein the water in which the resin is saturated is composed of weakly to medium radioactive waste water.
Claim 4
Dependent Claim
20 words
A method as defined in claim 1 wherein the additional water is composed of weakly to medium radioactive waste water.
Claim 5
Dependent Claim
33 words
A method as defined in claim 1 wherein the resin consists of spherical resin in a quantity corresponding to a dry resin content of up to 25% by weight, in the hardened product.
Claim 6
Dependent Claim
27 words
A method as defined in claim 4 the quantity of resin corresponds to a dry resin content of at least 10%, by weight, in the hardened product.
Claim 7
Dependent Claim
33 words
A method as defined in claim 1 wherein the resin consists of powdered resin in a quantity corresponding to a dry resin content of up to 15%, by weight, in the hardened product.
Claim 8
Dependent Claim
28 words
A method as defined in claim 6 wherein the quantity of resin corresponds to a dry resin content of at least 6%, by weight, in the hardened product.
Claim 9
Dependent Claim
24 words
A method as defined in claim 1 wherein the blast furnace cement provides the only substances stabilizing the resin during hardening of the mixture.
Claim 10
Dependent Claim
37 words
The method as defined in claim 1, wherein the blast furnace cement comprises 15 to 69 parts by weight of Portland cement clinker and correspondingly, 85 to 31 parts by weight of rapidly cooled blast furnace slag.
Claim 11
Dependent Claim
85 words
The method as defined in claim 9, wherein the blast furnace cement contains less than 55 weight percent calcium oxide, SiO 2 in an amount of 22 to 29 weight percent; Al 2 O 3 +TiO 2 in an amount of 6 to 13 weight percent; Fe 2 O 3 (FeO) in an amount of 1 to 3 weight percent; MgO in an amount of 1 to 5 weight percent; and Mn 2 O 3 (MnO) in an amount of 0.2 to 1.5 weight percent.
Claim 12
Dependent Claim
17 words
The method as defined in claim 9, wherein the blast furnace cement has the designation 35 L/HS-NW.
Claim 13
Dependent Claim
20 words
A method as defined in claim 2 wherein the additional water is composed of weakly to medium radioactive waste water.
Claim 14
Dependent Claim
27 words
A method as defined in claim 1, wherein the resin is a spherical resin in a quantity corresponding to a dry resin content of 8.7 to 26.6%.
Claim 15
Dependent Claim
28 words
A method as defined in claim 13, wherein the resin is in a quantity corresponding to a dry resin content of 8.7% by weight, in the hardened product.
References Cited (Backward Citations)
DE2717656A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |