EP0765524B1 - Verfahren zur volumenreduzierung einer mischung aus pulverharzen und inerten kunststoffasern - Google Patents
Verfahren zur volumenreduzierung einer mischung aus pulverharzen und inerten kunststoffasern Download PDFInfo
- Publication number
- EP0765524B1 EP0765524B1 EP95920750A EP95920750A EP0765524B1 EP 0765524 B1 EP0765524 B1 EP 0765524B1 EP 95920750 A EP95920750 A EP 95920750A EP 95920750 A EP95920750 A EP 95920750A EP 0765524 B1 EP0765524 B1 EP 0765524B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixture
- solvent
- volume
- dried
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/30—Processing
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
- G21F9/14—Processing by incineration; by calcination, e.g. desiccation
Definitions
- the invention relates to a method for volume reduction a mixture of filter fibers and a powder Ion exchange resin.
- Powdered ion exchange resins are used in nuclear power plants in the form of precoat layers for cleaning e.g. Condensate- and waste water flows.
- the powdery ion exchange resin which is also referred to below as powder resin
- Inert material in the form of short, thin filter fibers added.
- These filter fibers are usually made of polyacrylonitrile.
- the powder resin particles are in the spaces of the pile fixed.
- a precoat layer constructed in this way has a low flow resistance and is characterized by the fact that no cracks form. Such cracks, often due to shrinkage processes are often caused with pure powder resin precoat without observing filter fibers.
- the advantages that these combined precoat materials offer for the operation of such power plants are offset by certain disadvantages in the disposal of the used filter materials.
- the used filter materials are usually washed in as a suspension in so-called "high integrity containers” and dewatered there via built-in filter candles.
- the containers filled with the dewatered filter materials are then disposed of. Due to the structure of the filter material already explained, the amount of filter material that can be introduced per unit volume is very small.
- the vibration density of typical powder resin precoat materials is between 0.37 g / cm 3 and 0.42 g / cm 3 when delivered. Drying the material reduces the volume by about 35%; However, if water penetrates into the container filled with the dried filter material in the repository, there is a risk of container destruction due to the swelling pressure that occurs.
- the invention is therefore based on the object of a method to indicate with a particularly effective volume reduction a mixture of filter fibers and a powder Ion exchange resin is a waste product that can be disposed of is created.
- This object is achieved in that the Mixture a solvent dissolving the filter fibers added and the resulting mixture is first dried and is then thermally aftertreated.
- the invention is based on the consideration that the portion inert filter fibers in the mixture, i.e. in powder resin precoat materials, decisive for the ineffective use of space during final storage as a radioactive waste product responsible for.
- the drying process therefore first serves to remove the water contained in the waste by adding the Filter fiber dissolving or dissolving substance, i.e. by increase of the solvent, a structural breakdown of the proportion Filter fibers are made. This results in a significant reduction in volume of the waste product.
- the drying process expediently carried out at normal pressure or in vacuo, the drying temperature between 40 ° C and 200 ° C, preferably at 60 ° C to 120 ° C.
- the solvent can be added before, during or after the Drying process take place.
- suitable organic substances Dimethylformamide, dimethylacetamide, dimethyl sulfoxide, Ethylene carbonate.
- inorganic substances suitable as solvents salts of Rhodanhydric acid, nitric acid, sulfuric acid and Zinc chloride
- the thermal aftertreatment follows the drying process on. It serves to reduce the swelling behavior or swelling of the dried powder resins and is in one Temperature range between 120 ° C and 220 ° C, preferably between 130 ° C and 190 ° C.
- solvent Powder resin products expediently alkaline Fabrics such as Sodium hydroxide, potassium carbonate, Calcium oxide, calcium hydroxide or borates in proportions between 10 and 50 percent by weight mixed.
- alkaline Fabrics such as Sodium hydroxide, potassium carbonate, Calcium oxide, calcium hydroxide or borates in proportions between 10 and 50 percent by weight mixed.
- acidic substances such as Aluminum, zinc and iron salts, Boric acid or phosphorus pentoxide, also in proportions between 10 and 50 percent by weight.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Processing Of Solid Wastes (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Filtering Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
Claims (6)
- Verfahren zur Volumenreduzierung einer Mischung aus Filterfasern und einem pulverförmigen Ionenaustauscherharz, dadurch gekennzeichnet, daß der Mischung ein die Filterfasern lösendes Lösungsmittel zugegeben und das dabei entstehende Gemisch zunächst getrocknet und anschließend thermisch nachbehandelt wird.
- Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß bei der Behandlung von Filterfasern aus Polyacrylnitril als Lösungsmittel Dimethylformamid, Dimethylacetamid, Dimethylsulphoxid, Aethylencarbonat oder Zinkchlorid eingesetzt wird. - Verfahren nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, daß die thermische Nachbehandlung in einem Temperaturbereich zwischen 120 C und 220 C durchgeführt wird, wobei der getrockneten und mit dem Lösungsmittel behandelten Mischung zwischen 10 und 50 Gew.-% von Natriumhydroxid, Kaliumcarbonat, Calciumoxid, Calciumhydroxid, Borat oder Phosphorpentoxid zugemischt werden. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die thermische Nachbehandlung in einem Temperaturbereich zwischen 130° C und 190° C durchgeführt wird, wobei der getrockneten und mit dem Lösungsmittel behandelten Mischung zwischen 10 und 50 Gew.-% von Natriumhydroxid, Kaliumcarbonat, Calciumoxid, Calciumhydroxid, Borat oder Phosphorpentoxid zugemischt werden. - Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß sauer reagierende Mischungen zur Vermeidung von Gebindekorrosion mit Calciumoxid oder Magnesiumoxid vermischt werden bis ein neutraler bis schwach basischer pH-Wert eingestellt ist. - Verfahren nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß alkalisch reagierende Mischungen mit Borsäure oder sauren Salzen der Phosphorsäure vermischt werden, bis ein mindestens annähernd neutraler pH-Wert eingestellt ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4420658 | 1994-06-14 | ||
DE4420658A DE4420658C2 (de) | 1994-06-14 | 1994-06-14 | Verfahren zur Volumenreduzierung einer Mischung aus Filterfasern und einem pulverförmigen Ionenaustauscherharz |
PCT/DE1995/000724 WO1995034900A1 (de) | 1994-06-14 | 1995-06-02 | Verfahren zur volumenreduzierung einer mischung aus pulverharzen und inerten kunststoffasern |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0765524A1 EP0765524A1 (de) | 1997-04-02 |
EP0765524B1 true EP0765524B1 (de) | 1998-08-26 |
Family
ID=6520496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95920750A Expired - Lifetime EP0765524B1 (de) | 1994-06-14 | 1995-06-02 | Verfahren zur volumenreduzierung einer mischung aus pulverharzen und inerten kunststoffasern |
Country Status (7)
Country | Link |
---|---|
US (1) | US5877225A (de) |
EP (1) | EP0765524B1 (de) |
JP (1) | JP3524555B2 (de) |
DE (2) | DE4420658C2 (de) |
ES (1) | ES2120208T3 (de) |
RU (1) | RU2149469C1 (de) |
WO (1) | WO1995034900A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5168437B2 (ja) * | 2011-02-15 | 2013-03-21 | 富士電機株式会社 | 樹脂減容処理システムおよび樹脂減容処理方法 |
KR101668727B1 (ko) * | 2015-11-25 | 2016-10-25 | 한국원자력연구원 | 방사성 핵종을 포함하는 폐이온 교환수지 처리방법 및 장치 |
RU2685697C1 (ru) * | 2018-07-12 | 2019-04-23 | Акционерное Общество "Российский Концерн По Производству Электрической И Тепловой Энергии На Атомных Станциях" (Ао "Концерн Росэнергоатом") | Способ обработки отработанных ионообменных смол для захоронения и устройство для его осуществления |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3791981A (en) * | 1971-04-07 | 1974-02-12 | Aerochem Res Lab | Volume reduction of radioactive ion exchange resins for disposal |
DE2607996A1 (de) * | 1976-02-27 | 1977-09-01 | Bayer Ag | Hydrophile fasern und faeden aus synthetischen polymeren |
US4259229A (en) * | 1979-05-16 | 1981-03-31 | Nikitin Jury E | Process for producing colored polymer |
US4530723A (en) * | 1983-03-07 | 1985-07-23 | Westinghouse Electric Corp. | Encapsulation of ion exchange resins |
JPS6117995A (ja) * | 1984-07-04 | 1986-01-25 | 三菱重工業株式会社 | 放射性イオン交換樹脂の処理方法 |
CH664843A5 (de) * | 1984-11-12 | 1988-03-31 | Industrieorientierte Forsch | Verfahren zur verbesserung der stabilitaetseigenschaften von verfestigten radioaktiven ionenaustausch-harzpartikeln. |
US4762647A (en) * | 1985-06-12 | 1988-08-09 | Westinghouse Electric Corp. | Ion exchange resin volume reduction |
-
1994
- 1994-06-14 DE DE4420658A patent/DE4420658C2/de not_active Expired - Fee Related
-
1995
- 1995-06-02 JP JP50145196A patent/JP3524555B2/ja not_active Expired - Fee Related
- 1995-06-02 EP EP95920750A patent/EP0765524B1/de not_active Expired - Lifetime
- 1995-06-02 ES ES95920750T patent/ES2120208T3/es not_active Expired - Lifetime
- 1995-06-02 RU RU97100721/12A patent/RU2149469C1/ru not_active IP Right Cessation
- 1995-06-02 WO PCT/DE1995/000724 patent/WO1995034900A1/de active IP Right Grant
- 1995-06-02 DE DE59503360T patent/DE59503360D1/de not_active Expired - Fee Related
-
1996
- 1996-12-16 US US08/766,995 patent/US5877225A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE4420658A1 (de) | 1995-12-21 |
JP3524555B2 (ja) | 2004-05-10 |
DE4420658C2 (de) | 1996-10-31 |
WO1995034900A1 (de) | 1995-12-21 |
DE59503360D1 (de) | 1998-10-01 |
ES2120208T3 (es) | 1998-10-16 |
EP0765524A1 (de) | 1997-04-02 |
US5877225A (en) | 1999-03-02 |
JPH10501621A (ja) | 1998-02-10 |
RU2149469C1 (ru) | 2000-05-20 |
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