US4671898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treatment of a spent, radioactive, organic ion exchange resin
Assignee: Studsvik Energiteknik AB
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Filing: 1984-07-19
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Granted: 1987-06-09
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Expires: 2004-07-19
Abstract
Abstract A spent, radioactive, organic ion exchange resin is converted into a stable inorganic product having a considerably reduced volume in the following way. The radioactive ion exchange resin is mixed with a salt and an inorganic sorbent for radioactive nucleides, liberated by the salt, the mixture is dried and incinerated, whereupon the ash is solidified in cement.
Inventors
- 👤 Ake V. Hultgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:42
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/301; G21F9/302; G21F9/304; G21F9/32
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
70 words
A process for treatment of a spent, radioactive, organic ion exchange resin to reduce the volume thereof and to obtain a stable end product comprising mixing the ion exchange resin with a salt, which liberates radioactive substances from said ion exchange resin, as well as with an inorganic sorbent for the radioactive substances thus liberated, then drying and incinerating said mixture and solidifying the residue from the incineration in cement.
Claim 2
Dependent Claim
70 words
A process for treatment of a spent, radioactive, organic ion exchange resin to reduce the volume thereof and to obtain a stable end product comprising mixing the ion exchange resin with a salt, which liberates radioactive substances from said ion exchange resin, as well as with an inorganic sorbent for the radioactive substances thus liberated, then drying and incinerating said mixture and solidifying the residue from the incineration in cement.
Claim 3
Dependent Claim
24 words
A process according to claim 1 wherein the salt is added in such a quantity that the ion exchange resin will be essentially saturated.
Claim 4
Dependent Claim
16 words
A process according to claim 1 wherein the salt is a salt of aluminum or calcium.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein the salt is a salt of phosphoric acid, citric acid, tartaric acid, oxalic acid, formic acid or proponic acid.
Claim 6
Dependent Claim
52 words
A process according to claim 1 wherein the sorbent is a titanate or titanium hydroxide, a zirconate or a zirconium hydroxide or zirconium phosphate, an aluminate or an aluminum hydroxide, an alumino silicate such as bentonite or a natural or synthetic zeolite, or a mixture of two or more of these sorbents.
Claim 7
Dependent Claim
18 words
A process according to claim 1 wherein the dried mixture is incinerated at a temperature of 500°-900° C.
Claim 8
Dependent Claim
15 words
A process according to claim 6 wherein the dried mixture is incinerated in oxygen-enriched air.
Claim 9
Dependent Claim
16 words
A process according to claim 2 wherein the salt is a salt of aluminum or calcium.
Claim 10
Dependent Claim
26 words
A process according to claim 2 wherein the salt is a salt of phosphoric acid, citric acid, tartaric acid, oxalic acid, formic acid or propionic acid.
Claim 11
Dependent Claim
51 words
A process according to claim 2 wherein the sorbent is a titanate or titanium hydroxide, a zirconate or a zirconium hydroxide or zirconium phosphate, an aluminate or an aluminum hydroxide, an alumino silicate such as bentonite or a natural synthetic zeolite, or a mixture of two or more of these sorbents.
Claim 12
Dependent Claim
51 words
A process according to claim 3 wherein the sorbent is a titanate or titanium hydroxide, a zirconate or a zirconium hydroxide or zirconium phosphate, an aluminate or an aluminum hydroxide, an alumino silicate such as bentonite or a natural synthetic zeolite, or a mixture of two or more of these sorbents.
Claim 13
Dependent Claim
51 words
A process according to claim 4 wherein the sorbent is a titanate or titanium hydroxide, a zirconate or a zirconium hydroxide or zirconium phosphate, an aluminate or an aluminum hydroxide, an alumino silicate such as bentonite or a natural synthetic zeolite, or a mixture of two or more of these sorbents.
Claim 14
Dependent Claim
51 words
A process according to claim 8 wherein the sorbent is a titanate or titanium hydroxide, a zirconate or a zirconium hydroxide or zirconium phosphate, an aluminate or an aluminum hydroxide, an alumino silicate such as bentonite or a natural synthetic zeolite, or a mixture of two or more of these sorbents.
Claim 15
Dependent Claim
51 words
A process according to claim 9 wherein the sorbent is a titanate or titanium hydroxide, a zirconate or a zirconium hydroxide or zirconium phosphate, an aluminate or an aluminum hydroxide, an alumino silicate such as bentonite or a natural synthetic zeolite, or a mixture of two or more of these sorbents.
Claim 16
Dependent Claim
18 words
A process according to claim 2 wherein the dried mixture is incinerated at a temperature of 500°-900° C.
Claim 17
Dependent Claim
18 words
A process according to claim 3 wherein the dried mixture is incinerated at a temperature of 500°-900° C.
Claim 18
Dependent Claim
18 words
A process according to claim 4 wherein the dried mixture is incinerated at a temperature of 500°-900° C.
Claim 19
Dependent Claim
18 words
A process according to claim 5 wherein the dried mixture is incinerated at a temperature of 500°-900° C.
Claim 20
Dependent Claim
15 words
A process according to claim 15, wherein the dried mixture is incinerated in oxygen-enriched air.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |