JPS63265200A - Removal of iodine in organic solvent - Google Patents
Removal of iodine in organic solventInfo
- Publication number
- JPS63265200A JPS63265200A JP10074887A JP10074887A JPS63265200A JP S63265200 A JPS63265200 A JP S63265200A JP 10074887 A JP10074887 A JP 10074887A JP 10074887 A JP10074887 A JP 10074887A JP S63265200 A JPS63265200 A JP S63265200A
- Authority
- JP
- Japan
- Prior art keywords
- iodine
- lead acetate
- organic solvent
- solvent
- org
- 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
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 37
- 239000011630 iodine Substances 0.000 title claims abstract description 37
- 239000003960 organic solvent Substances 0.000 title claims description 40
- 229940046892 lead acetate Drugs 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000741 silica gel Substances 0.000 claims abstract description 11
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 11
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 239000003463 adsorbent Substances 0.000 abstract description 11
- 238000012958 reprocessing Methods 0.000 abstract description 9
- 239000002904 solvent Substances 0.000 abstract description 9
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 abstract description 2
- 239000002915 spent fuel radioactive waste Substances 0.000 description 8
- 229910052778 Plutonium Inorganic materials 0.000 description 6
- 229910052770 Uranium Inorganic materials 0.000 description 6
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 6
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 6
- DNYWZCXLKNTFFI-UHFFFAOYSA-N uranium Chemical compound [U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U] DNYWZCXLKNTFFI-UHFFFAOYSA-N 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005191 phase separation Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229940094933 n-dodecane Drugs 0.000 description 2
- 239000003758 nuclear fuel Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000010888 waste organic solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、主として使用済核燃料の再処理施設から発生
する有機溶媒中のヨウ素を、吸着剤を用いて吸着、除去
する有機溶媒中のヨウ素除去方法に関する。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention uses an adsorbent to adsorb and remove iodine in organic solvents mainly generated from spent nuclear fuel reprocessing facilities. This invention relates to a method for removing iodine from organic solvents.
（従来の技術）
原子力発電においては、燃料資源を有効利用するために
、使用済核燃料を再処理して不要成分である核分裂生成
物からウランやプルトニウム等の有用成分を分離し、こ
れらを核燃料として再使用することが行われている。こ
の再処理の方法としては、使用済核燃料を硝酸で溶解し
、この硝酸溶液を有機溶媒で液々抽出してウランおよび
プルトニウムを分離回収する方法（いわゆるピュレック
ス法）が一般に用いられている。(Conventional technology) In nuclear power generation, in order to effectively utilize fuel resources, spent nuclear fuel is reprocessed to separate useful components such as uranium and plutonium from unnecessary fission products, and these are used as nuclear fuel. It is being reused. A commonly used reprocessing method is to dissolve spent nuclear fuel in nitric acid, extract the nitric acid solution with an organic solvent, and separate and recover uranium and plutonium (the so-called Purex method).
第１図は使用済核燃料再処理方法の一例のフロー図であ
る。この再処理方法においては、原子力施設から再処理
工場に送られた使用済み核燃料はせん断機で小片に切断
され（ａ）、硝酸により溶解された後（ｂ）、清澄工程
を経て（Ｃ）、有機溶媒による抽出が行われる（ｄ）。FIG. 1 is a flow diagram of an example of a spent nuclear fuel reprocessing method. In this reprocessing method, spent nuclear fuel sent from a nuclear facility to a reprocessing plant is cut into small pieces using a shear machine (a), dissolved in nitric acid (b), and then undergoes a clarification process (C). Extraction with an organic solvent is carried out (d).
溶解工程で発生じた売気はオフガス処理されて（ｅ）大
気中に放出される。そしてウラン、プルトニウムを分離
、精製する抽出工程において、抽出用溶媒として、リン
酸トリブチル等の有機リン酸エステルとその希釈剤であ
るｎ−ドデカン等の炭化水素を３ニア程度の容積比で混
合した有機溶媒が一般に使用されており、ウランおよび
プルトニウムはこの混合溶媒で抽出された後、希硝酸水
で逆抽出され（ｄ）、さらに抽出、逆抽出が行われてウ
ラン、プルトニウムの精製が行われる（ｆ）、精製され
たウラン、プルトニウムの製品は、原子炉の核燃料とし
て加工され再利用される（ｇ）０通常この有機溶媒は、
放射能汚染され、かつその一部が放射線損傷により劣化
しているので再生して再利用するため試薬等で洗浄され
るが（ｈ）、一部余剰分が放射性廃棄物として回収され
一旦貯蔵された後（ｉ）処理される。The gas generated in the melting process is treated as an off-gas and (e) is released into the atmosphere. In the extraction process to separate and purify uranium and plutonium, an organic phosphate such as tributyl phosphate and a hydrocarbon such as n-dodecane as a diluent were mixed as an extraction solvent at a volume ratio of about 3Nia. Organic solvents are generally used, and after uranium and plutonium are extracted with this mixed solvent, they are back-extracted with dilute nitric acid (d), and further extraction and back-extraction are performed to purify uranium and plutonium. (f) Refined uranium and plutonium products are processed and reused as nuclear fuel for nuclear reactors (g) 0 Usually, this organic solvent is
It is radioactively contaminated and some of it has deteriorated due to radiation damage, so it is cleaned with reagents etc. in order to be recycled and reused (h), but some surplus is collected as radioactive waste and temporarily stored. (i) processed;
この廃棄物となる有機溶媒の処理方法として、第２図の
フロー図に示した処理方法があげられる。As a method for treating this waste organic solvent, there is a treatment method shown in the flowchart of FIG. 2.
まず有機溶媒（ケロシン８０〜９８体積％、リン酸トリ
ブチル（ＴＢＰ）２〜２０体積％）は一旦貯蔵された後
（ｉ）、濃リン酸（８５％Ｈ，ＰＯ４）により付加化合
物（ＴＢＰ ・２Ｈ，ＰＯ４）が形成されて相分離され
る（ｊ）、 次に下相部（ＴＢＰ ・２Ｎ、 ＰＯ，、
ρ＝１．２４ ’）は水により付加化合物が分解されて
相分離され（ｋ）、さらに希ソーダ溶液により相分疏さ
れ洗浄された後（１） 、ＴＢＰの浄化処理、又はプラ
スチック（ＰＶＣ）固化処理が施される（ｍ）。First, organic solvents (kerosene 80-98% by volume, tributyl phosphate (TBP) 2-20% by volume) are once stored (i) and then converted into an adduct compound (TBP 2H) using concentrated phosphoric acid (85%H, PO4). , PO4) is formed and undergoes phase separation (j), then the lower phase part (TBP ・2N, PO,,
ρ = 1.24') is the result of decomposition of the adduct with water and phase separation (k), followed by phase separation and washing with dilute soda solution (1). Purification treatment of TBP or plastic (PVC) Solidification treatment is performed (m).
上相部（ρ＝Ｏ，ａ）はシリカゲル等の吸着剤により不
純物を除去され浄化された後（ｎ）、再使用されている
（０）。The upper phase portion (ρ=O, a) is purified by removing impurities with an adsorbent such as silica gel (n), and then reused (0).
（発明が解決しようとする問題点）
しかしながら、このような有機溶媒中にヨウ素が含まれ
ていると、有機ヨウ素が生じ、有機ヨウ素は反応性が極
めて低いため、ヨウ素が完全に除去できないので、ヨウ
素を含んだ有機溶媒の再使用または焼却処理は難しいと
いう問題があった。(Problems to be Solved by the Invention) However, when iodine is contained in such an organic solvent, organic iodine is generated, and organic iodine has extremely low reactivity, so iodine cannot be completely removed. There has been a problem in that it is difficult to reuse or incinerate organic solvents containing iodine.
このような有機溶媒中の不純物はシリカゲルや活性炭等
の吸着剤による吸着処理によって除去することが行われ
ているが、第２図に示したように、シリカゲルや活性炭
等の従来から使用されている吸着剤ではヨウ素除去容量
が小さいので多量のシリカゲル等が必要であった。Such impurities in organic solvents are removed by adsorption treatment using adsorbents such as silica gel and activated carbon. Since the adsorbent has a small iodine removal capacity, a large amount of silica gel or the like is required.
本発明はこのような事情に対処してなされたもので、有
機溶媒中のヨウ素を効率良く除去し、再使用または焼却
処理ができる有機溶媒中のヨウ素除去方法を提供するこ
とを目的とする。The present invention was made in response to these circumstances, and an object of the present invention is to provide a method for removing iodine from an organic solvent, which can efficiently remove iodine from an organic solvent and allow reuse or incineration.
［発明の構成］
（問題点を解決するための手段）
本発明の有機溶媒中のヨウ素除去方法は、原子力施設か
ら廃棄物として発生した有機溶媒に塩基性酢酸鉛または
当該物質を添着したシリカゲルまたは活性炭を混合して
この塩基性酢酸鉛に前記有機溶媒中のヨウ素を吸着させ
、次いでこのヨウ素を吸着した塩基性酢酸鉛を前記有機
溶媒から分離、除去するか、または上記酢酸鉛、または
酢酸鉛を添着したシリカゲル、活性炭を充填またはプリ
コートした塔へ有機溶媒を通過させることにより有ａ溶
媒中のヨウ素を除去することを特徴とする。[Structure of the Invention] (Means for Solving the Problems) The method of removing iodine from an organic solvent of the present invention is based on the method of removing iodine from an organic solvent by adding basic lead acetate or silica gel impregnated with the substance to an organic solvent generated as waste from a nuclear facility. iodine in the organic solvent is adsorbed to this basic lead acetate by mixing activated carbon, and then the basic lead acetate that has adsorbed iodine is separated and removed from the organic solvent, or the above lead acetate or lead acetate is The method is characterized in that iodine in the aqueous solvent is removed by passing the organic solvent through a column filled with or pre-coated with silica gel or activated carbon impregnated with silica gel or activated carbon.
（作用）
本発明の有機溶媒中のヨウ素除去方法は、塩基性酢酸鉛
を吸着剤として使用することにより、有機溶媒中のヨウ
素を効率良く吸着、除去することができる。従って有機
溶媒を再使用、または焼却処理する際にヨウ素が環境へ
放出される可能性を低減することができ、有機溶媒を容
易に再使用、または焼却処理することができる。(Function) The method for removing iodine in an organic solvent of the present invention can efficiently adsorb and remove iodine in an organic solvent by using basic lead acetate as an adsorbent. Therefore, the possibility of iodine being released into the environment when the organic solvent is reused or incinerated can be reduced, and the organic solvent can be easily reused or incinerated.
（実施例） 以下本発明の一実施例について説明する。(Example) An embodiment of the present invention will be described below.
まず主としてｎ−ドデカンからなる有機溶媒中に有機ヨ
ウ素を添加して模擬の有機溶媒を作り、この模擬有機溶
媒２０ｍ Ｊ２に、次表に示した吸着剤２ｇを添加して
、この混合液を振どう機で２０分間攪拌した。そしてこ
の混合液を静置後、上澄み液をサンプリングし、この上
澄み液中のヨウ素濃度をガスクロマトグラフにより分析
した。その結果を次表に示す。（以下余白）
上澄液中のヨウ素濃度
上表かられかるように、塩基性酢酸鉛を吸着剤として用
いれば、他の吸着剤を用いた場合に比べて効率良く有機
溶媒中のヨウ素を吸着、除去することができる。First, add organic iodine to an organic solvent mainly consisting of n-dodecane to create a simulated organic solvent, add 2 g of the adsorbent shown in the following table to 20 m J2 of this simulated organic solvent, and shake the mixture. The mixture was stirred for 20 minutes using a mechanical machine. After the mixture was allowed to stand still, the supernatant was sampled, and the iodine concentration in the supernatant was analyzed using a gas chromatograph. The results are shown in the table below. (Left below) Concentration of iodine in supernatant liquid As shown in the table above, using basic lead acetate as an adsorbent can adsorb iodine in organic solvents more efficiently than when using other adsorbents. , can be removed.
従って、塩基性酢酸鉛または塩基性酢酸鉛を添着させた
シリカゲル、活性炭等を吸着剤として用いて、使用済核
燃料再処理施設等から廃棄物として発生した有機溶媒中
のヨウ素を吸着、除去すれば、有機溶媒を再使用または
焼却処理する際にヨウ素が環境に放出される量を低減し
、環境に対する安全性を向上させることができる。Therefore, basic lead acetate or silica gel impregnated with basic lead acetate, activated carbon, etc., can be used as an adsorbent to adsorb and remove iodine from organic solvents generated as waste from spent nuclear fuel reprocessing facilities. , the amount of iodine released into the environment during reuse or incineration of organic solvents can be reduced, and environmental safety can be improved.
［発明の効果］
以上説明したように、本発明の有機溶媒中のヨウ素除去
方法を用いれば、使用済核燃料再処理施設等から廃棄物
として発生した有機溶媒中のヨウ素を効率良く吸着、除
去することができるので、有機溶媒を容易に再使用、ま
たは焼却処理することができる。また吸着材のヨウ素除
去容量が太きいので二次廃棄物の発生量を低減すること
ができる。[Effects of the Invention] As explained above, by using the method for removing iodine in organic solvents of the present invention, iodine in organic solvents generated as waste from spent nuclear fuel reprocessing facilities, etc. can be efficiently adsorbed and removed. Therefore, the organic solvent can be easily reused or incinerated. Furthermore, since the adsorbent has a large iodine removal capacity, the amount of secondary waste generated can be reduced.
第１図は従来の使用済核燃料再処理方法のフロー図、第
２図は従来の有機溶媒処理方法のフロー図である。
出願人 日本原子力事業株式会社同
株式会社 東芝
代理人 弁理士 須 山 佐 −
第１図FIG. 1 is a flow diagram of a conventional spent nuclear fuel reprocessing method, and FIG. 2 is a flow diagram of a conventional organic solvent treatment method. Applicant: Japan Atomic Energy Corporation
Toshiba Corporation Representative Patent Attorney Sasa Suyama - Figure 1
Claims (2)
、または塩基性酢酸鉛を吸着させたシリカゲルまたは活
性炭を混合してこの塩基性酢酸鉛に前記有機溶媒中のヨ
ウ素を吸着させ、次いでこのヨウ素を吸着した塩基性酢
酸鉛を前記有機溶媒から分離、除去することを特徴とす
る有機溶媒中のヨウ素除去方法。(1) Basic lead acetate, or silica gel or activated carbon adsorbed with basic lead acetate, is mixed with an organic solvent generated from a nuclear facility, and the basic lead acetate adsorbs iodine in the organic solvent. A method for removing iodine in an organic solvent, which comprises separating and removing basic lead acetate that has adsorbed iodine from the organic solvent.
リカゲル、活性炭を充填した充填塔またはプリコートし
た吸着塔へ有機溶媒を通すことにより有機溶媒中のヨウ
素を除去することを特徴とする特許請求の範囲第１項記
載の有機溶媒中のヨウ素除去方法。(2) A patent characterized in that iodine in an organic solvent is removed by passing the organic solvent through a packed tower filled with lead acetate or silica gel impregnated with basic lead acetate, activated carbon, or a precoated adsorption tower. A method for removing iodine in an organic solvent according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10074887A JPS63265200A (en) | 1987-04-23 | 1987-04-23 | Removal of iodine in organic solvent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10074887A JPS63265200A (en) | 1987-04-23 | 1987-04-23 | Removal of iodine in organic solvent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63265200A true JPS63265200A (en) | 1988-11-01 |
Family
ID=14282153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10074887A Pending JPS63265200A (en) | 1987-04-23 | 1987-04-23 | Removal of iodine in organic solvent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63265200A (en) |
-
1987
- 1987-04-23 JP JP10074887A patent/JPS63265200A/en active Pending
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