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US4401591A
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Treatment of organic ion exchange material containing radioactive waste products
Assignee: ABB Norden Holding AB
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Filing: 1981-01-28
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Granted: 1983-08-30
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Expires: 2001-01-28
Abstract
Abstract An organic ion exchange material, which comprises a mixture of grains of a first type bearing groups containing exchangeable hydrogen ions and grains of a second type bearing groups containing exchangeable hydroxyl ions and which has been used in a cleaning circuit in a nuclear reactor, is subjected to a treatment before the ion exchange material is further processed for final storage of the radioactive waste products contained therein. The treatment comprises removing hydrogen ions and/or hydroxyl ions or groups containing hydrogen ions and/or groups containing hydroxyl ions from the grains, whereafter the grains of the first type are separated from the grains of the second type, before the grains of each type are further processed separately for final storage of the radioactive waste products contained therein.
Inventors
- 👤 Milan Korostenski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:37
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
A method for the treatment of an organic ion exchange material which contains radioactive waste products and comprises a mixture of grains of a first type bearing groups containing exchangeable hydrogen ions and grains of a second type bearing groups containing exchangeable hydroxyl ions, which method comprises the steps of (a) removing said ions from at least one of said first and second types of grains in said mixture of grains, (b) thereafter separating the grains of said first type from the grains of said second type, and (c) further processing the grains of each of said first and second types separately for final storage of at least said radioactive waste products.
Claim 2
Independent Claim
112 words
A method for the treatment of an organic ion exchange material which contains radioactive waste products and comprises a mixture of grains of a first type bearing groups containing exchangeable hydrogen ions and grains of a second type bearing groups containing exchangeable hydroxyl ions, which method comprises the steps of (a) removing said ions from at least one of said first and second types of grains in said mixture of grains, (b) thereafter separating the grains of said first type from the grains of said second type, and (c) further processing the grains of each of said first and second types separately for final storage of at least said radioactive waste products.
Claim 3
Dependent Claim
39 words
A method according to claim 1, wherein in step (a) said organic ion exchange material is treated with a solution of a salt in order to replace the hydrogen ions in said first type of grains with another cation.
Claim 4
Dependent Claim
37 words
A method according to claim 1, wherein in step (a) said organic ion exchange material is treated with a solution of an acid to replace the hydroxyl ions in said second type of grains with another anion.
Claim 5
Dependent Claim
37 words
A method according to claim 1, wherein in step (a) said organic ion exchange material is treated with a solution of a hydroxide to replace the hydrogen ions in said first type of grains with another cation.
Claim 6
Dependent Claim
29 words
A method according to claim 1, wherein in step (a) the hydrogen ions are removed from the first type of grains by removing the groups containing the hydrogen ions.
Claim 7
Dependent Claim
28 words
A method according to claim 1, wherein in step (a) the hydroxyl ions are removed from the second type of grains by removing the groups containing hydroxyl ions.
Claim 8
Independent Claim
24 words
A method according to claims 5 or 6, wherein in step (a) said ion-containing groups are removed by heating said organic ion exchange material.
Claim 9
Dependent Claim
61 words
A method according to claim 1, wherein in step (b) the grains of said first type are separated from the grains of said second type by bringing the organic ion exchange material into contact with a fluid which has a density between the density of the grains of said first type and the density of the grains of said second type.
Claim 10
Dependent Claim
40 words
A method according to claim 1, wherein prior to step (a) said organic ion exchange material is treated with a solution of a salt in order to replace the hydroxyl ions in said second type of grains with another anion.
Claim 11
Dependent Claim
53 words
A method according to claim 1, wherein prior to step (a) said organic ions exchange material is treated with a solution of a salt in order to replace the hydrogen ions in said first type of grains with another cation and the hydroxyl ions in said second type of grains with another anion.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |