CS277470B6 - Electrolyte for electrochemical semi-dry decontamination of metallic surfaces - Google Patents
Electrolyte for electrochemical semi-dry decontamination of metallic surfaces Download PDFInfo
- Publication number
- CS277470B6 CS277470B6 CS896476A CS647689A CS277470B6 CS 277470 B6 CS277470 B6 CS 277470B6 CS 896476 A CS896476 A CS 896476A CS 647689 A CS647689 A CS 647689A CS 277470 B6 CS277470 B6 CS 277470B6
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- CS
- Czechoslovakia
- Prior art keywords
- weight percent
- electrolyte
- semi
- decontamination
- weight
- Prior art date
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- 239000003792 electrolyte Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims abstract description 4
- SQYUJKVKVFILNB-UHFFFAOYSA-N methyl 2-amino-4-[(2,5-dichlorophenyl)carbamoyl]benzoate Chemical compound C1=C(N)C(C(=O)OC)=CC=C1C(=O)NC1=CC(Cl)=CC=C1Cl SQYUJKVKVFILNB-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005202 decontamination Methods 0.000 claims description 11
- 230000003588 decontaminative effect Effects 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 3
- GEVPUGOOGXGPIO-UHFFFAOYSA-N oxalic acid;dihydrate Chemical compound O.O.OC(=O)C(O)=O GEVPUGOOGXGPIO-UHFFFAOYSA-N 0.000 claims description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 abstract description 15
- 235000006408 oxalic acid Nutrition 0.000 abstract description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 229940062993 ferrous oxalate Drugs 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- OWZIYWAUNZMLRT-UHFFFAOYSA-L iron(2+);oxalate Chemical compound [Fe+2].[O-]C(=O)C([O-])=O OWZIYWAUNZMLRT-UHFFFAOYSA-L 0.000 description 1
- 239000010857 liquid radioactive waste Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Detergent Compositions (AREA)
Abstract
Elektrolyt obsahuje 0,1 až 1 hmotnostných percent kyseliny anilín-2,5-disulfónovej, 1 až 2 hmotnostných percent kyseliny šťavelovej, 1 až 3 hmotnostných percent dusičnanu amónneho a Je doplněný do 100 hmotnostných percent vodou.The electrolyte contains 0.1 to 1% by weight percent aniline-2,5-disulfonic acid, 1 to 2 % by weight of oxalic acid, 1 to 3 weight percent ammonium nitrate and is added to 100 weight percent water.
Description
Oblasť technikyTechnical field
Vynález sa týká elektrolytu, určeného na polosuchá elektrochemická dekontamináciu kovových povrchov zariadení a ich častí kontaminovaných počas prevádzky jádrového reaktora, najma pre ich sprístupnenie defektoskopickým skúškam.The invention relates to an electrolyte intended for the semi-dry electrochemical decontamination of metal surfaces of equipment and parts thereof contaminated during the operation of a nuclear reactor, in particular for making them accessible to defectoscopic tests.
Polosuchá elektrochemická dekontaminácia kovových materiálov je v prevádzke jadrovo-energetických zariadení široko používaná. Ako elektrolyty sa používájú zmesné roztoky kyselin,ako je roztok zložený z 1 až 40 hmotnostných percent kyseliny sírovej a 3 až 50 hmotnostných percent kyseliny fosforečnej a 0 až 5 hmotnostných percent kyseliny šťavelovej doplněný do 100 hmotnostných percent vodou. Ďalej zmes 3 až 5 hmotnostných percent kyseliny šťavelovej a 0 až 3 hmotnostných percent kyseliny citrónovej doplněný do 100 hmotnostných percent vodou. Připadne roztoky iných látok, ako kyselina dusičná, síran sodný, hydroxid sodný, síran hlinitý, kyselina octová a podobné.Semi-dry electrochemical decontamination of metallic materials is widely used in the operation of nuclear power plants. Mixed acid solutions are used as electrolytes, such as a solution composed of 1 to 40 weight percent sulfuric acid and 3 to 50 weight percent phosphoric acid and 0 to 5 weight percent oxalic acid supplemented to 100 weight percent with water. Next, a mixture of 3 to 5 weight percent oxalic acid and 0 to 3 weight percent citric acid made up to 100 weight percent with water. Optionally, solutions of other substances such as nitric acid, sodium sulfate, sodium hydroxide, aluminum sulfate, acetic acid and the like.
Nevýhodou týchto roztokov je použitie anorganických kyselin, hlavně kyseliny sírovej, dusičnej, či fosforečnej, často v příliš vysokých koncentráciách, čo má nepriaznivý korózny vplyv na opracovávaný kovový povrch, na materiály aplikačného prostriedku (pracovná elektroda, tampón), resp. sa zvyšujú nároky na spracovanie vznikájúcich kvapalných rádioaktívnych odpadov.The disadvantage of these solutions is the use of inorganic acids, especially sulfuric, nitric or phosphoric acid, often in too high concentrations, which has an adverse corrosive effect on the treated metal surface, on the materials of the application means (working electrode, tampon), resp. the demands on the treatment of liquid radioactive waste are increasing.
V roztokoch obsahujúcich samotnú kyselinu šťavelovú občas dochádza k zrážaniu šťavelanu železnatého a tým k rekontaminácii dekontaminovaného povrchu. Opakované používanie elektrolytov s vysokým obsahom kyseliny šťavelovej (3 až 5 hmotnostných percent) pri polosuchéj elektrochemickéj dekontaminácii má za následok postupné zhoršovanie kvality opracovaného povrchu, čo je spojené s rastúcim stupňom rekontaminácie a zhoršením dekontaminovatelnosti povrchu.In solutions containing oxalic acid alone, ferrous oxalate occasionally precipitates and thus the decontaminated surface is recontaminated. Repeated use of electrolytes with a high content of oxalic acid (3 to 5 weight percent) in semi-dry electrochemical decontamination results in a gradual deterioration of the quality of the treated surface, which is associated with an increasing degree of recontamination and deterioration of surface decontamination.
Ďalšou nevýhodou je intenzívny vznik rozkladných plynov na elektrodách počas elektrolýzy, ktoré významné zaťažujú pracovně prostredie rádioaktívnymi aerosolmi.Another disadvantage is the intensive formation of decomposition gases on the electrodes during electrolysis, which significantly burdens the working environment with radioactive aerosols.
Podstata vynálezuThe essence of the invention
Vyššie uvedené nedostatky sú odstránené u elektrolytu podlá vynálezu, ktorého podstata spočívá v tom, že obsahuje 0,1 až 1 hmotnostných percent kyseliny anilín-2,5-disulfónovej, 1 až 2 hmotnostných percent dihydrátu kyseliny šťavelovej a 1 až 3 hmotnostných percent dusičnanu amonného. Zvyšok do 100 hmotnostných percent tvoří voda.The above-mentioned disadvantages are eliminated in the electrolyte according to the invention, which consists in 0.1 to 1% by weight of aniline-2,5-disulfonic acid, 1 to 2% by weight of oxalic acid dihydrate and 1 to 3% by weight of ammonium nitrate. . The remainder up to 100 weight percent is water.
Výhodou elektrolytu podlá vynálezu je odstránenie negativného korózneho pósobenia na opracovávané kovové materiály pri dlhodobom používaní polgsuchej elektrochemickej dekontaminácie, ďalej dosiahnutie vysokej dekontaminačnej účinnosti pri relativné nízkej koncentrácii zložiek elektrolytu - maximálně 5 hmotnostnýchThe advantage of the electrolyte according to the invention is the elimination of negative corrosion on the processed metallic materials during long-term use of dry electrochemical decontamination, further achievement of high decontamination efficiency at relatively low concentration of electrolyte components - maximum 5 wt.
CS 277470 B6 2 percent a podstatné zníženie vzniku rozkladných elektrolytických plynov. Pri použití elektrolytu podía vynálezu klesla intenzita tvorby plynných splodín o 75 % oproti doteraz známým a používaným elektrolytem. 'CS 277470 B6 2 percent and a significant reduction in the formation of decomposable electrolytic gases. When using the electrolyte according to the invention, the intensity of flue gas formation decreased by 75% compared to the electrolyte known and used hitherto. '
Příklad vyhotovenia vynálezuExample of an embodiment of the invention
Elektrolyt podlá vynálezu bol aplikovaný v zložení 0,5 hmotnostných jednotiek kyseliny anilín-2,5-disulfónovej, 2 hmotnostně jednotky kyseliny štavelovej — dihydrát, 2 hmotnostně jednotky dusičnanu amonného a doplněný do 100 hmotnostných jednotiek . vodou. Takto připravený elektrolyt sa použil pri polosuchéj elektrochemickej dekontaminácii povrchov nátrubkov reaktora typu WER-440 s nasledujúcimi výsledkami: dekontaminačné faktory DF=150 až 470, metalografickými pozorovaniami sa nezistilo žiadne. nepriaznivé pósobenie použitého spósobu dekontaminácie na opracovaných povrchoch nátrubkov reaktora. Počas elektrolýzy sa pozorovala nižšia tvorba plynných produktov a aerosolov oproti doteraz používaným, elektrolytom.The electrolyte according to the invention was applied in a composition of 0.5 units by weight of aniline-2,5-disulfonic acid, 2 units by weight of oxalic acid dihydrate, 2 units by weight of ammonium nitrate and made up to 100 units by weight. with water. The electrolyte thus prepared was used in the semi-dry electrochemical decontamination of the surfaces of the reactor nozzles of the WER-440 type with the following results: decontamination factors DF = 150 to 470, no metallographic observations were found. adverse effect of the decontamination method used on the treated surfaces of the reactor nozzles. During electrolysis, a lower formation of gaseous products and aerosols was observed compared to the electrolytes used so far.
Priemvselná využitelnost .Industrial usability.
Elektrolyt v zložení podlá vynálezu je použitelný hlavně pri polosuchéj dekontaminácii zariadení jádrových elektrární.The electrolyte in the composition according to the invention is usable mainly in the semi-dry decontamination of nuclear power plant equipment.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS896476A CS277470B6 (en) | 1989-11-16 | 1989-11-16 | Electrolyte for electrochemical semi-dry decontamination of metallic surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS896476A CS277470B6 (en) | 1989-11-16 | 1989-11-16 | Electrolyte for electrochemical semi-dry decontamination of metallic surfaces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS647689A3 CS647689A3 (en) | 1992-08-12 |
| CS277470B6 true CS277470B6 (en) | 1993-03-17 |
Family
ID=5411911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS896476A CS277470B6 (en) | 1989-11-16 | 1989-11-16 | Electrolyte for electrochemical semi-dry decontamination of metallic surfaces |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS277470B6 (en) |
-
1989
- 1989-11-16 CS CS896476A patent/CS277470B6/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS647689A3 (en) | 1992-08-12 |
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