JPS604899A - Decontaminating device - Google Patents
Decontaminating deviceInfo
- Publication number
- JPS604899A JPS604899A JP11249483A JP11249483A JPS604899A JP S604899 A JPS604899 A JP S604899A JP 11249483 A JP11249483 A JP 11249483A JP 11249483 A JP11249483 A JP 11249483A JP S604899 A JPS604899 A JP S604899A
- Authority
- JP
- Japan
- Prior art keywords
- decontamination
- tank
- sulfuric acid
- neutralization tank
- neutralization
- 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.)
- Pending
Links
- 238000005202 decontamination Methods 0.000 claims description 55
- 230000003588 decontaminative effect Effects 0.000 claims description 53
- 239000007788 liquid Substances 0.000 claims description 27
- 238000006386 neutralization reaction Methods 0.000 claims description 26
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 7
- 235000011152 sodium sulphate Nutrition 0.000 claims description 7
- 239000012670 alkaline solution Substances 0.000 claims description 5
- 239000003929 acidic solution Substances 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- 230000002285 radioactive effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- -1 iron oxide Chemical compound 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 235000014413 iron hydroxide Nutrition 0.000 description 3
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 3
- 235000006408 oxalic acid Nutrition 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 150000001447 alkali salts Chemical class 0.000 description 2
- 239000003011 anion exchange membrane Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 2
- 150000004692 metal hydroxides Chemical class 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- PQQAOTNUALRVTE-UHFFFAOYSA-L iron(2+);diformate Chemical compound [Fe+2].[O-]C=O.[O-]C=O PQQAOTNUALRVTE-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 1
- 229940039790 sodium oxalate Drugs 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- IPIGTJPBWJEROO-UHFFFAOYSA-B thorium(4+);tetraphosphate Chemical compound [Th+4].[Th+4].[Th+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O IPIGTJPBWJEROO-UHFFFAOYSA-B 0.000 description 1
Landscapes
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
性金属によって汚染された金属性物体を除染槽内の酸性
溶液中に浸漬し，そのままあるいは物体と対極との間に
通電させて電解し乍ら金属性物体の金属酸化物あるいは
母拐を融解させることによって金属性物体の汚染物を取
除く除染装置に関する。[Detailed description of the invention] A metallic object contaminated with a metallic object is immersed in an acidic solution in a decontamination tank, and the metal of the metallic object is electrolyzed as it is or by passing current between the object and a counter electrode. This invention relates to a decontamination device that removes contaminants from metal objects by melting oxides or matrix particles.
従来，酸性液を用いた除染槽に放射性金属によって汚染
された金属物体を浸漬し，そのままかあるいは対極との
間に通電し除染する除染装置が提案されている。このよ
うな除染装置に於いてはリン酸等の無機酸あるいはシュ
ウ酸などの有機酸の水溶０．を除染液として用い、除染
能力が低下した使用済の液は中和槽で中和し、その′ｔ
！ま同化するかあるいは析出する鉄などの金属のリン酸
化合物や／ユウ酸化合物などを沈でん装置、濾過装置。Conventionally, decontamination equipment has been proposed in which a metal object contaminated with radioactive metals is immersed in a decontamination tank using an acidic liquid, and the metal object is decontaminated either as is or by passing electricity between the object and a counter electrode. In such decontamination equipment, water-soluble inorganic acids such as phosphoric acid or organic acids such as oxalic acid are used. is used as a decontamination solution, and the used solution whose decontamination ability has decreased is neutralized in a neutralization tank, and its 't
! Precipitation equipment and filtration equipment to remove assimilated or precipitated phosphoric acid compounds and/or oxalic acid compounds of metals such as iron.
あるいは遠心分離機等によって固液０離し、除染液中に
溶解した汚染物を固化体として回収する。Alternatively, the solid and liquid are separated using a centrifuge or the like, and the contaminants dissolved in the decontamination solution are recovered as a solidified substance.
然し乍らこれらの装置を用いる場合にはリン酸あるいは
シュウ酸を使い捨てしている為、または中和過程で析出
する金属化合物がリン酸あるいはンユウ酸等の酸の化合
物であるために除染液として用いる酸の使用量が多くな
るという問題がある。However, when using these devices, phosphoric acid or oxalic acid is used as a decontamination solution because it is disposable, or because the metal compound that precipitates during the neutralization process is an acid compound such as phosphoric acid or oxalic acid. There is a problem that the amount of acid used increases.
寸だ中和過程で生成するアルカリの塩がリン酸すトリウ
ムやンユウ酸ナトリウムのような塩であり。The alkali salts produced during the neutralization process are salts such as thorium phosphate and sodium oxalate.
これらの塩中のアルカリ全屈はリン酸やンユウ酸と一部
錯化合物として存在し易いために、酸を回収することが
難しいという問題点がある。まだ最近、ギ酸などの酸を
用い、除染によって生成するギ酸鉄などの金属化合物を
屯屏酸化や過酸化水素による酸化によって５）解し、水
酸化鉄に変換し液には新たにギ酸などの酸を加える方法
が紹介されているが、この方法によっても薬品使用料を
低減することは離しい。Since the total alkali content in these salts tends to partially exist as a complex with phosphoric acid or phosphoric acid, there is a problem in that it is difficult to recover the acid. Recently, metal compounds such as iron formate produced during decontamination are decomposed using acids such as formic acid and oxidized with hydrogen peroxide (5), converted to iron hydroxide, and the liquid is newly added with formic acid, etc. A method of adding acid has been introduced, but even this method is far from reducing the cost of chemicals.
本発明は、このような事情に鑑みてなされたもので容易
に除染液が再生使用でき、２次廃棄物の量を低減するこ
とができる除染装置を提案することを目的としている。The present invention has been made in view of the above circumstances, and an object of the present invention is to propose a decontamination device that can easily reuse a decontamination liquid and reduce the amount of secondary waste.
本発明は、前記目的を達成する為に硫酸あるいは硫酸に
水酸化ナトリウムを一部加えた水溶液を用いた除染槽と
、除染槽からの使用後の除染液を中和しスラッジを生成
する中和槽と、中和槽からのスラッジと硫酸すトリウム
水溶液を分離する分離装置と２分離装置で分離した硫酸
ナトリウム水溶液から１床酸及び水酸化す） ＩＪウム
を回収し、夫々除染槽と中和槽へ供給する隔膜電解槽と
からなることを特徴としている。本発明は前記構成によ
り除染液として溶解した鉄などの金属と安定な錯体を作
らないような酸として硫酸を用い、金属を溶解した除染
液はアルカリ例えば水酸化ナトリ′ウムを加えて中和し
、析出する水酸化鉄などの金属水酸化物及び酸化鉄など
の金属水酸化物及び酸化鉄等の金属酸化物からなるスラ
ッジは離心０離等によって効率的に分離し２分離した硫
酸のアルカリ塩例えば硫酸すトリウノ・の水溶液は隔膜
電解を用いて硫酸と水酸化す） ＩＪウムに／；＋離し
、硫酸は除染液として再利用し２寸だ水酸化ナトリウム
は中和剤として再使用するようにｊ７ている。In order to achieve the above object, the present invention provides a decontamination tank using sulfuric acid or an aqueous solution of sulfuric acid with a portion of sodium hydroxide added, and a decontamination tank that neutralizes the used decontamination liquid from the decontamination tank to generate sludge. A neutralization tank, a separation device that separates the sludge from the neutralization tank and an aqueous solution of sodium sulfate, and a separation device that separates sludge from the neutralization tank, and a sodium sulfate aqueous solution separated by two separation devices. It is characterized by consisting of a tank and a diaphragm electrolytic tank that supplies to the neutralization tank. The present invention uses sulfuric acid as an acid that does not form a stable complex with dissolved metals such as iron as a decontamination solution, and the decontamination solution in which metals are dissolved is mixed with an alkali such as sodium hydroxide. The sludge consisting of metal hydroxides such as iron hydroxide, metal hydroxides such as iron oxide, and metal oxides such as iron oxide, which are mixed and precipitated, is efficiently separated by eccentricity, etc., and the separated sulfuric acid is An aqueous solution of an alkali salt, such as sulfuric acid, is hydroxylated with sulfuric acid using diaphragm electrolysis. j7 to use.
以下添付図面に従って本発明に係る除染装置の好ましい
実施例を詳説する。Preferred embodiments of the decontamination apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.
本実施例の除染プロセスは、除染液槽ｌ、中和槽２．遠
心分離機３．隔膜電解槽４．固化装置５゜直流電源装置
６を主として構成される。中和槽２には攪拌羽根２０が
イ」設されており、′−１だ中和槽２の底部には散気板
］６．その側部にはヒータ］８が取りつけられている。The decontamination process of this embodiment includes a decontamination liquid tank 1, a neutralization tank 2. Centrifuge 3. Diaphragm electrolytic cell4. The solidifying device 5 mainly consists of a DC power supply device 6. The neutralization tank 2 is equipped with stirring blades 20, and the bottom of the neutralization tank 2 is equipped with an aeration plate.6. A heater] 8 is attached to the side thereof.
隔；１位電解槽４は陰イオン交換膜からなる隔膜］−４
で陽極室２９と陰極室３０とに分けられており、それぞ
れには陽極５１と陰極３２が配設されている。また陽極
室２９、陰極室３０には熱交換器としてのクーラ］７が
挿入されている。Separation; 1st electrolytic cell 4 is a diaphragm made of an anion exchange membrane]-4
It is divided into an anode chamber 29 and a cathode chamber 30, each of which is provided with an anode 51 and a cathode 32. Furthermore, a cooler 7 as a heat exchanger is inserted into the anode chamber 29 and the cathode chamber 30.
除染液槽ｌ内に挿入される除染対象物１９は内面が汚染
された金属性配管である。除染液（■］には約１０％の
硫酸と約５％の硫酸ナトリウムの溶解した水溶液である
除染液２１がｉｉｊ’？だされている・除染対象物］９
の配管の内面には金属酸化物か付着しており、それに放
射性金属が取込まれて汚染されている。除染液槽ｌにお
いては対象物１９の配管内面は付着している金属酸化物
が溶解するかあるいは酸化物の下部にある母材が溶解す
ることによって汚染物が除去される。除染効果を増すた
めに液を加熱したり、攪拌したりあるいはポンプによっ
て循環することも可能である。また除染液槽１の中に対
極を入れ、除染対象物と対極の間を電解を行うことも可
能である。The object 19 to be decontaminated inserted into the decontamination liquid tank 1 is a metal pipe whose inner surface is contaminated. The decontamination liquid (■) contains decontamination liquid 21, which is an aqueous solution containing approximately 10% sulfuric acid and approximately 5% sodium sulfate.・Object to be decontaminated] 9
Metal oxides are attached to the inner surface of the pipes, and radioactive metals are taken in and contaminated. In the decontamination liquid tank 1, contaminants are removed from the inner surface of the piping of the object 19 by dissolving the attached metal oxide or by dissolving the base material below the oxide. It is also possible to heat the solution, stir it or circulate it with a pump to increase the decontamination effect. It is also possible to place a counter electrode in the decontamination liquid tank 1 and perform electrolysis between the object to be decontaminated and the counter electrode.
除染をくり返すことにより、除染液２１中の金属イオン
主に鉄イオンや懸たく物か増えてくると。By repeating decontamination, the metal ions in the decontamination solution 21, mainly iron ions and other substances, will increase.
除染能力すなわち表面に付着している酸化物や母材を溶
解する能力は低下してくる。そこで使用済除染液２２は
中和槽２に送られる。中和槽２に於いては隔膜電解槽４
の陰極室３０から供給され。The decontamination ability, that is, the ability to dissolve oxides and base materials adhering to the surface, decreases. The used decontamination liquid 22 is then sent to the neutralization tank 2. In the neutralization tank 2, the diaphragm electrolytic tank 4
is supplied from the cathode chamber 30.
水酸化ナトリウムを含むアルカリ溶液２７と使用清除染
液２２か混合され、硫酸ナトリウムが生成すると共に水
酸化鉄あるいは酸化鉄のスラッジが生成する。中和槽２
ではｌｅｔ気板１６から酸素を多く含むガスが気泡とな
って発生する。また中和槽２内の液はヒータ１８によっ
て加熱される。これらの操作により、除染液２１中に含
まれる金属イオン即ち２価の鉄イオンは加熱されながら
中和されかつ酸素が供給されるために、磁性酸化鉄のス
ラッジになり易い。The alkaline solution 27 containing sodium hydroxide and the used decontamination liquid 22 are mixed to produce sodium sulfate and iron hydroxide or iron oxide sludge. Neutralization tank 2
Then, gas containing a large amount of oxygen is generated from the air plate 16 in the form of bubbles. Further, the liquid in the neutralization tank 2 is heated by a heater 18. Through these operations, metal ions, that is, divalent iron ions contained in the decontamination liquid 21 are neutralized while being heated and oxygen is supplied, so that they tend to become magnetic iron oxide sludge.
これらのスラッジを含む中和液２３は次に遠心分離機３
に供給される。遠心分離機３には実施例に於いてデカン
タクイプを使用した。遠心分離機３では約２０００Ｑの
遠心力をかけることによりスラッジ２５は分離され１分
離液２４はフィルり３３を経て隔膜電解槽４に送られる
。一方スラツジ２，５は固化装置５へ供給され、セメン
ト・アスファルトあるいはプラスチックなどによって固
化体２６にされ処分される。The neutralized liquid 23 containing these sludges is then sent to the centrifuge 3
supplied to As the centrifuge 3, a decanter scoop was used in the example. In the centrifugal separator 3, the sludge 25 is separated by applying a centrifugal force of about 2000 Q, and the separated liquid 24 is sent to the diaphragm electrolytic cell 4 via the filler 33. On the other hand, the sludges 2 and 5 are supplied to a solidifying device 5, and are made into a solidified body 26 using cement, asphalt, plastic, etc., and then disposed of.
隔膜電解槽４に送られた分離液２４は、まず陰極室３０
に入れられる。陰極室３０には陰極板３２が入っており
、この陰極板３２には鉄板などの畿属板が用いられる。The separated liquid 24 sent to the diaphragm electrolytic cell 4 is first transferred to the cathode chamber 30
can be placed in The cathode chamber 30 contains a cathode plate 32, and a metal plate such as an iron plate is used for the cathode plate 32.
陰極室３０において分離液２４中の硫酸ナトリウムを形
成しているナトリウムイオンは陰極板３２のまわりに引
き寄せられるが、硫酸イオンは陰イオン交換膜からなる
隔膜］４を通過して陽極室２９に入り、陽極板３１に引
き寄せられる。陽極板３］としては黒鉛’＋ｌｊｉ、が
用いられたが、電極なども使用可能である。陰極板３２
および陽極板３１には直流電源装置６から適当な電圧が
印加される。陰極室３０および陽極室２９には前記した
ようにクーラ１７が入れられているが、クーラ］７によ
って適度に冷却され液の蒸発が防止される。In the cathode chamber 30, the sodium ions forming sodium sulfate in the separated liquid 24 are attracted around the cathode plate 32, but the sulfate ions pass through the diaphragm 4 made of an anion exchange membrane and enter the anode chamber 29. , are attracted to the anode plate 31. Although graphite'+lji was used as the anode plate 3, other electrodes can also be used. Cathode plate 32
An appropriate voltage is applied to the anode plate 31 from the DC power supply device 6. As described above, the cooler 17 is placed in the cathode chamber 30 and the anode chamber 29, and the cooler 7 provides appropriate cooling and prevents evaporation of the liquid.
クーラ１゛？によって熱交換され、加熱されたクーラ１
７中の熱媒体３４は中和槽２のヒータ１８に送られ加熱
の役目をする。各電極では水の電気分解も同時に起こる
。従って陰極室３０では水素ガスが、また陽極室２９で
は酸素ガスが発生する。Cooler 1゛? Cooler 1 was heated by exchanging heat with
The heat medium 34 in the tank 7 is sent to the heater 18 of the neutralization tank 2 and serves as a heating element. Water electrolysis also occurs simultaneously at each electrode. Therefore, hydrogen gas is generated in the cathode chamber 30 and oxygen gas is generated in the anode chamber 29.
このうち陽極室２９で発生する酸素ガス３５は陽極Ｍ２
９上に設けられたフード１５によって捕集され、中和槽
２に設けられた散気板１６に送られ曝気に用いられる。Among these, the oxygen gas 35 generated in the anode chamber 29 is the anode M2.
It is collected by a hood 15 provided on the neutralization tank 9 and sent to an aeration plate 16 provided in the neutralization tank 2 for use in aeration.
以上の操作によシ陰極室３０からは水酸化ナトリウムを
多く含むアルカリ溶液２７が生成し、また陽極室２９か
らは硫酸を多く含む酸性溶ｔｉ、２８が発生する。そこ
でアルカリ溶液は中和槽２に送られ、−！た酸性溶液２
日は除染液槽１に送られ。By the above operations, an alkaline solution 27 containing a large amount of sodium hydroxide is generated from the cathode chamber 30, and an acidic solution 28 containing a large amount of sulfuric acid is generated from the anode chamber 29. There, the alkaline solution is sent to neutralization tank 2, and -! Acidic solution 2
The water is sent to decontamination liquid tank 1.
除染および中和等の操作が継続的に行われる。尚。Operations such as decontamination and neutralization will continue. still.
７乃至１３はポンプでおる。7 to 13 are pumped.
前記実施例による実験結果の一例を示すと、内表面の汚
染密度がｌ Ｏ’ ）ｌｅｉ １０７１２である配管材
を用いて除染を行った結果、約１００間で除染係数−１
Ｏ２が得られた。まだ除染液に用いる酸の使用量は従来
の除染装置に比べ同一の除染効果に於いて約１／１０
になり、また２次廃棄物−の量は約μに低減される。An example of the experimental results according to the above example is that when decontamination was carried out using piping material whose inner surface had a contamination density of 10712, the decontamination coefficient was -1 between about 100 and 10712.
O2 was obtained. The amount of acid used in the decontamination solution is still about 1/10th that of conventional decontamination equipment for the same decontamination effect.
and the amount of secondary waste is reduced to approximately μ.
以」二説明したように本発明に係る除染装置によれば、
除染液として用いる酸の再生が可能となる為、使用する
酸の計は大幅に低減でき、目、つそれに伴う２次廃棄物
の量も低減する。As explained below, according to the decontamination device according to the present invention,
Since it is possible to regenerate the acid used as a decontamination solution, the total amount of acid used can be significantly reduced, and the amount of secondary waste that accompanies it will also be reduced.
図は本発明に係る実施例の除染プロセスを示す説明図で
ある。
１・・・除染液槽 ２・・・中和槽
「・・遠心分離機 ４・隔膜電解槽
１９・・・除染対象物 ２１・・・除染液２２・・使用
済除染液 ２３・・中和液２４・・分離液２５・・・ス
ラッジ
２７・・・アルカリ溶液 ２８・・酸溶液３５・酸素ノ
ノズ。The figure is an explanatory diagram showing a decontamination process according to an embodiment of the present invention. 1...Decontamination liquid tank 2...Neutralization tank...Centrifugal separator 4.Diaphragm electrolytic tank 19...Object to be decontaminated 21...Decontamination liquid 22...Used decontamination liquid 23 ... Neutralization liquid 24 ... Separation liquid 25 ... Sludge 27 ... Alkaline solution 28 ... Acid solution 35 - Oxygen nozzle.
Claims (3)
を除染槽内の酸性溶液中に浸漬し、そのままあるいは物
体と対極との間に通電させて電解し乍ら金属性物体の金
属酸化物あるいは母材を溶解させることによって金属性
物体の汚染物を取除く除染装置に於いて、硫酸あるいは
硫酸に水酸化ナトリウムを一部加えた水溶液を用いた除
染槽と。 除染槽からの使用後の除染液を中和しスラッジを生成す
る中和槽と、中和槽からのスラッジと硫酸ナトリウム水
溶液を分離する分離鏝面と２分離装置で分離した硫酸ナ
トリウム水溶液から硫酸を多く含む酸溶液および水酸化
ナトリウムを多く含むアルカリ溶液を回収し、それぞれ
除染槽と中和槽へ１共給する隔膜電解槽とからなること
を特徴とする除染装置。(1) A metallic object whose surface is contaminated with radioactive metal is immersed in an acidic solution in a decontamination tank, and the metal oxide of the metallic object is electrolyzed either as it is or by passing electricity between the object and the counter electrode. Or, in decontamination equipment that removes contaminants from metal objects by dissolving the base material, a decontamination tank that uses sulfuric acid or an aqueous solution of sulfuric acid and a portion of sodium hydroxide. A neutralization tank that neutralizes the used decontamination liquid from the decontamination tank to generate sludge, a separation trowel that separates the sludge from the neutralization tank and the sodium sulfate aqueous solution, and a sodium sulfate aqueous solution separated by two separation devices. A decontamination device comprising a diaphragm electrolytic tank which recovers an acid solution containing a large amount of sulfuric acid and an alkaline solution containing a large amount of sodium hydroxide from a sulfuric acid solution and co-supplies one to a decontamination tank and a neutralization tank, respectively.
に導いて曝気することを特徴とする特許請求の範囲第１
項の除染装置。(2) Claim 1 characterized in that oxygen gas generated in the anode chamber of the diaphragm electrolytic cell is led to a neutralization tank and aerated.
Section decontamination equipment.
を特徴とする特許請求の範囲第１項の除染装置。(3) The decontamination device according to claim 1, characterized in that the heat generated in the diaphragm electrolytic cell is supplied to the neutralization tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11249483A JPS604899A (en) | 1983-06-22 | 1983-06-22 | Decontaminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11249483A JPS604899A (en) | 1983-06-22 | 1983-06-22 | Decontaminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS604899A true JPS604899A (en) | 1985-01-11 |
Family
ID=14588047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11249483A Pending JPS604899A (en) | 1983-06-22 | 1983-06-22 | Decontaminating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS604899A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5085747A (en) * | 1989-05-19 | 1992-02-04 | Akio Nikano | Ultrasonic machining method |
| AU631986B2 (en) * | 1990-04-26 | 1992-12-10 | B.U.S. Engitec Servizi Ambientali S.R.L. | Process for the integral recovery of the sulphur contained in spent lead batteries, obtained in the form of pure sulphuric acid for reuse in the production of new batteries |
-
1983
- 1983-06-22 JP JP11249483A patent/JPS604899A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5085747A (en) * | 1989-05-19 | 1992-02-04 | Akio Nikano | Ultrasonic machining method |
| AU631986B2 (en) * | 1990-04-26 | 1992-12-10 | B.U.S. Engitec Servizi Ambientali S.R.L. | Process for the integral recovery of the sulphur contained in spent lead batteries, obtained in the form of pure sulphuric acid for reuse in the production of new batteries |
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