JPS6380831A - Removal of iodine in gas - Google Patents
Removal of iodine in gasInfo
- Publication number
- JPS6380831A JPS6380831A JP61227048A JP22704886A JPS6380831A JP S6380831 A JPS6380831 A JP S6380831A JP 61227048 A JP61227048 A JP 61227048A JP 22704886 A JP22704886 A JP 22704886A JP S6380831 A JPS6380831 A JP S6380831A
- Authority
- JP
- Japan
- Prior art keywords
- iodine
- aqueous solution
- gas
- silver
- silver ion
- 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.)
- Granted
Links
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 45
- 239000011630 iodine Substances 0.000 title claims abstract description 45
- 239000007864 aqueous solution Substances 0.000 claims abstract description 16
- 150000002497 iodine compounds Chemical class 0.000 claims abstract description 11
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000002244 precipitate Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 36
- 229910052709 silver Inorganic materials 0.000 claims description 12
- 239000004332 silver Substances 0.000 claims description 12
- -1 silver ions Chemical class 0.000 claims description 7
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 8
- 239000002253 acid Substances 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 150000003839 salts Chemical class 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 abstract 4
- 239000008246 gaseous mixture Substances 0.000 abstract 3
- 229910002651 NO3 Inorganic materials 0.000 abstract 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- 239000006260 foam Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 15
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000003463 adsorbent Substances 0.000 description 6
- 229910017604 nitric acid Inorganic materials 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 229910001961 silver nitrate Inorganic materials 0.000 description 5
- 229910002089 NOx Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- YPNVIBVEFVRZPJ-UHFFFAOYSA-L silver sulfate Chemical compound [Ag+].[Ag+].[O-]S([O-])(=O)=O YPNVIBVEFVRZPJ-UHFFFAOYSA-L 0.000 description 3
- 229910000367 silver sulfate Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000010457 zeolite Substances 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001987 mercury nitrate Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- DRXYRSRECMWYAV-UHFFFAOYSA-N nitrooxymercury Chemical compound [Hg+].[O-][N+]([O-])=O DRXYRSRECMWYAV-UHFFFAOYSA-N 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000002915 spent fuel radioactive waste Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 206010021033 Hypomenorrhoea Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- G21F9/02—Treating gases
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Treating Waste Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【発明の詳細な説明】
技街分立：
本発明は、混合気体中からヨウ素及び／又はヨウ素化合
物をほぼ完全に除去する方法に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field: The present invention relates to a method for almost completely removing iodine and/or iodine compounds from a gas mixture.
従米伎離二
使用済み核燃料の再処理工場における、使用済み核燃料
の溶解工程から発生するオフガス（以下、ＤＯＧと略称
する）から、その中に含まれるヨウ素を除去する方法と
しては、既に種々の方法が提案されている。Various methods have already been used to remove iodine contained in the off-gas (hereinafter abbreviated as DOG) generated from the spent nuclear fuel melting process at the spent nuclear fuel reprocessing plant. is proposed.
それら方法にはアルカリ洗浄法、メルキュレックス（Ｍ
ｅｒｃｕｒｅｘ ）法、ヨードックス（Ｉｏｄｏｘ）法
などの湿式法と各種の固形吸着剤を用いる乾式法とがあ
る。先ず、湿式法については、アルカリ洗浄法は、ＤＯ
Ｇを１−２Ｍの苛性ソーダ水溶液で洗浄し、ＤＯＧ中の
ヨウ素をＮａｌ、 Ｍａｉｌ、Ｎａ１Ｏなどに変えるこ
とにより、吸収除去する方法である。この方法は生成ヨ
ウ素化物の沈澱の外に、ＤＯＧ中に含まれているＣ０２
やＮＯｘ と苛性ソーダとの反応により、多量のスラ
ッジが生成し、後処理すべき放射性廃棄物の量が著しく
増大し、その処理のための負担が嵩むという欠点がある
（参考文献■Ｈｏ１ｌａｄａｙ、 Ｄ、１１．．１９７
９． Ａ １ｌｔｅ−ｒａｔｕｒｅ ５ｕｒｖｅｙ：
ｍｅｔｈｏｄｓ ｏｆ ｔｈｅ ｒｅｍｏｖａｌ ｏ
ｆ １ｏｄｉｎｅｓｐｅｃｉｅｓ ｆｒｏｍ ｏｆｆ−
ｇａｓｅｓ ａｎｄ １ｉｑｕｉｄ ｗａｓｔｅ ｓｔ
ｒｅａｍｓｏｆ ｎｕｃｌｅａｒ ｐｏｗｅｒ ａｎｄ
ｎｕｃｌｅａｒ ｆｕｅｌ ｒｅｐｒｏｃｅｓｓｌｎ
ｇｐｌａｎｔｓ、 ｗｉｔｈ ｅｍｐｈａｓｉｓ ｏｎ
５ｏｌｉｄ ５ｏｒｂｅｎｔｓ、 ０ＲＮＬ／ＴＭ−
Ｇ３５０；■Ｉｎｔｅｒｎａｔｌｏｎａｌ Ａｔｏｍｉ
ｃ Ｅｎｅｒｇｙ Ａｇｅｎｃｙ、 １９８０゜Ｒａｄ
ｉｏｌｏｄｊｎｅ ｒｅｍｏｖａｌ Ｉｎ ｎｕｃｌｅ
ａｒ ｆａｃｌｌｌｌｔｌｅｓ。These methods include alkaline cleaning method, Mercurex (M
There are wet methods such as ercurex method and Iodox method, and dry methods using various solid adsorbents. First, regarding the wet method, the alkaline cleaning method uses DO
This is a method of absorbing and removing DOG by washing DOG with a 1-2M aqueous solution of caustic soda and converting the iodine in DOG to Nal, Mail, Na1O, etc. In addition to precipitating the produced iodide, this method also reduces the amount of CO2 contained in DOG.
The disadvantage is that a large amount of sludge is generated due to the reaction between NOx and caustic soda, significantly increasing the amount of radioactive waste that must be post-treated, and increasing the burden of processing it (References ■Holladay, D. 11..197
9. A 1lte-rate 5urvey:
methods of the removal
f1odinespecies from off-
gases and 1quid waste st
reamsof nuclear power and
nuclear fuel reprocessln
gplants, with emphasis on
5olid 5orbents, 0RNL/TM-
G350; ■International Atomi
c Energy Agency, 1980° Rad
iolodjne removal in nucleus
ar facllllltles.
Ｔｅｃｈｎｌｃａ ｒｅｐｏｒｔｓ ５ｅｒｉｅｓ Ｎ
ｏ、 ２０１ 、 ＩＡＥＡ、 Ｖｉｅｎｎａｉ■Ｂｅ
ｎｅｄｌｃｔ、 Ｍ、、Ｔ、 Ｈ，Ｐｌｇｆｏｒｄ ａ
ｎｄ Ｈ，Ｗ、 Ｌｅｖｌ、 ＋９８１、 Ｎｕｃｌｅ
ａｒ Ｃｈｅｍｉｃａｌ Ｅｎｇｌｎｅｅｒｌｎｇｌ
ＭｃＧｒａｗ−ＨｉｌｌＮ、Ｙ、）
ヌルキュレックス法は吸収液として、硝酸水銀の硝酸溶
液（１−１４１０１／ｌ ）を使用し、ヨウ素をＨｇ１
２、Ｈｇ（ＩＯ２）２等に変えて、吸収除去する方法で
ある。この方法は水銀を使用する為、水銀による公害を
排除する為、十分な対策を必要としている（上記参照文
献■、■及び■を参照）。なお、公開されているヌルキ
ュレックス法によると、その操作過程に於いて、ヨウ素
を吸収した硝酸水銀溶液は、電解槽に送られ、そこでヨ
ウ素と水銀とに分解され、ヨウ素はヨウ化銅として固定
し、水銀を循環使用している。このように、その操作過
程は極めて複雑に構成されなければならないという、欠
点を有している（参考文献■Ｃｏ１１ａｄ、 Ｇ、Ｅ、
Ｒ，ｅｔ ａｌ、、 １９７８． Ｉｏｄｉｎｅ ｔｒ
ａｐｐｌｎ）ａｎｄ ｃｏｎｄｌｔｌｏｎｉｎｇ Ｉｎ
ｔｈｅ ｍｅｒｃｕｒｅｘ ｓｙｓｔｅｍ、 １Ｇｔ
ｈＤＯＥ Ｎｕｃｌｅａｒ Ａｉｒ Ｃｌｅａｎｉｎ
ｇ Ｃｏｎｆｅｒｅｎｃｅ、 ｐ５５２．）ｏ最後に、
ヨードックス法は、２０−２２ｍｍｏｌ／ｌという高ｌ
コ度の鞘酸を吸収液として使用し、ヨウ素を旧Ｏとして
沈澱させ、分離回収する方法である。この方法では、濃
硝酸が用いられるため、その装置材料が腐蝕されるとい
う好ましくない難点を有している（上記 参考文献■。Technlca reports 5eries N
o, 201, IAEA, Vienna■Be
nedlct, M,, T, H, Plgford a.
nd H, W, Levl, +981, Nucle
ar Chemical Englneerlngl
McGraw-Hill N, Y.) The Nurculex method uses a nitric acid solution of mercury nitrate (1-14101/l) as the absorption liquid, and absorbs iodine into Hg1
2. This is a method of absorbing and removing Hg(IO2)2, etc. Since this method uses mercury, sufficient measures are required to eliminate pollution caused by mercury (see references ①, ②, and ① above). According to the published Nurculex method, during the operation process, the mercury nitrate solution that has absorbed iodine is sent to an electrolytic bath, where it is decomposed into iodine and mercury, and iodine is converted into copper iodide. It is fixed and mercury is recycled. As described above, it has the disadvantage that its operation process must be extremely complicated (References: Co11ad, G, E,
R, et al., 1978. Iodine tr
appln) and condoltloning In
the mercurex system, 1Gt
hDOE Nuclear Air Cleanin
g Conference, p552. ) o Finally,
The iodox method has a high l content of 20-22 mmol/l.
In this method, iodine is precipitated as old O by using hardened sheath acid as an absorption liquid, and the iodine is separated and recovered. Since this method uses concentrated nitric acid, it has the undesirable disadvantage of corroding the equipment material (see Reference ① above).
■及び■を参照）。(See ■ and ■).
次に、ヨウ素の除去に各種の固形吸着剤を使用する乾式
法に関しては、その大部分は銀又は銀塩とヨウ素との反
応が利用されている。例えば、ＡＣＧＩ２０は、非晶質
ケイ酸を担体とし、それに石門酸銀を添着した吸着剤で
あって、ＮＯｘの共存下でも、効率良くヨウ素を吸着除
去できる（参考文献■特公昭５３−２２０７７参照）。Next, regarding dry methods that use various solid adsorbents to remove iodine, most of them utilize the reaction of silver or silver salt with iodine. For example, ACGI20 is an adsorbent that uses amorphous silicic acid as a carrier and impregnates silver oxide, and can efficiently adsorb and remove iodine even in the coexistence of NOx (see References ■ Japanese Patent Publication No. 53-22077). ).
しかし乍ら、硝酸銀とヨウ素及びヨウ素化合物とを十分
に急速に反応させるためには、ＤＯＧを約１５０°Ｃに
加熱しなければならない（参考文献■及び■を参照）。However, in order to react sufficiently rapidly the silver nitrate with iodine and iodine compounds, the DOG must be heated to about 150° C. (see references 1 and 2).
また、米国ハンフォード工場では素焼きのベルルサドル
に６１６８を担持せしめた吸着剤を使用して、良好な成
果を挙げている。しかし乍ら、この吸着剤を使用する場
合、ＤＯＧを加熱しなければならず、１１０’Ｃ以下の
温度では銀とヨウ素との反応が生起しない、と言われて
いる（参考文献■及び■山水 寛、１９７６、原子力化
学工学１日刊工業新聞参照）。Additionally, the Hanford plant in the United States has achieved good results by using an adsorbent containing 6168 on unglazed Berl saddles. However, when using this adsorbent, DOG must be heated, and it is said that the reaction between silver and iodine does not occur at temperatures below 110'C (References ■ and ■ Sansui Hiroshi, 1976, Nuclear Chemical Engineering 1 Nikkan Kogyo Shimbun).
なお、その他の種々の銀交換ゼオライトによるＤＯＧ中
のヨウ素の除去法も報告されているが、いずれも、前者
と同様に、１００’Ｃ以上に加熱したＤＯＧを使用しな
ければ目的は達成できない（参考文献 ■及び■Ｔｈｏ
ｍａｓ ＋Ｔ 、Ｒ，。Additionally, methods for removing iodine from DOG using various other silver-exchanged zeolites have also been reported, but, like the former, in either case, the purpose cannot be achieved unless DOG is heated to 100'C or higher ( References ■ and ■ Tho
mas +T, R,.
Ｂ、Ａ、５ｔａｐｅｌｅｓ ａｎｄ Ｌ、Ｐ、Ｍｕｒｐ
ｈｙ＋ １９７８． Ｔｈｅ ｄｅｖｅｌｏｐｍｅｎｔ
Ｎｕｃ！ｅａｒ Ａｉｒ Ｃｌｅａｎｉｎｇ Ｃｏｎｆ
ｅｒｅｎｃｅ、 ｐ３９４．）、また、固形吸着剤を使
用する場合は、何れも、ヨウ素を吸収したＡＣ６１２０
や銀交換ゼオライトなどを、そのまま貯蔵するか、また
は、最終処分に付そうとする場合、それら余分な体積の
担体をも取り扱わなければならないという、決定的な不
利を有している。B, A, 5 tapeles and L, P, Murp
hy+ 1978. The development
Nuc! ear Air Cleaning Conf
erence, p394. ), and when using a solid adsorbent, AC6120 which has absorbed iodine
If silver-exchanged zeolite or silver-exchanged zeolite is to be stored as is or for final disposal, the extra volume of the carrier must also be handled, which is a decisive disadvantage.
本光肌０且直上
、本発明の目的は、上述のような湿式法及び乾式法の持
つ欠陥を佇せず、ヨウ素化合物以外の余分な廃棄物を伴
うことなく、操作工程を簡単に構成することができ、濃
硝酸のような腐蝕性の薬品を使用することなく、また、
ＤＯＧを予め加熱する必要もなく、ＤＯＧ中に共存する
ＮＯｘや水分の影響を殆ど受けることのない方法を提供
するに存する。The object of the present invention is to simplify the operation process without having to deal with the drawbacks of the wet method and dry method as described above, and without producing unnecessary waste other than iodine compounds. without the use of corrosive chemicals such as concentrated nitric acid, and
It is an object of the present invention to provide a method that does not require preheating DOG and is hardly affected by NOx and moisture coexisting in DOG.
光期！田賎ＬＪ塾且：
本発明のこの目的は、本発明により、少なくともヨウ素
及び／又はヨウ素化合物を含む混合気体あるいは蒸気を
、少なくとも銀イオンを含む水溶液と接触させ、該気体
中のヨウ素を不溶性ヨウ素化物の沈澱として除去するこ
とによって、達成できた。Light period! Taze LJ Juku: This object of the present invention is to contact a mixed gas or vapor containing at least iodine and/or an iodine compound with an aqueous solution containing at least silver ions, and convert the iodine in the gas into insoluble iodine. This was achieved by removing the compound as a precipitate.
即ち、本発明は、ヨウ素及び／又はヨウ素化合物を含む
混合気体あるいは蒸気を、常温で、銀イオンを含む水溶
液に接触させるものであって、いわゆる湿式法の範喘に
属するものであり、銀塩を固形担体に担持させる乾式法
ではない。That is, the present invention belongs to the so-called wet method, in which a mixed gas or vapor containing iodine and/or an iodine compound is brought into contact with an aqueous solution containing silver ions at room temperature. It is not a dry method in which the material is supported on a solid carrier.
銀イオンを含む水溶液としては、各種の鉱酸塩、殊に硝
酸塩又は硫酸塩が使用でき、その濃度範囲は０．０００
１ないし５ｍｏｌ／ｌの広範囲で差し支えなく、殊に、
０．００１ないし１ｍｏｌ／ｌの範囲が好都合である。Various mineral acid salts, especially nitrates or sulfates, can be used as the aqueous solution containing silver ions, and the concentration range is 0.000.
A wide range of 1 to 5 mol/l is acceptable, especially,
A range of 0.001 to 1 mol/l is advantageous.
また、それら鉱酸塩の水溶液は鉱酸を含んでいてもよい
。処理しようとする気体と銀イオンを含む水溶液との気
・液接触を実施する為の装置としては、気泡塔、スプレ
ー塔、棚段塔、濡れ壁塔などの慣用の装置、その他、新
規な気・液接触装置など、どのような型式の装置でも使
用できる。Moreover, the aqueous solution of these mineral salts may contain a mineral acid. Devices for bringing the gas to be treated into gas-liquid contact with the aqueous solution containing silver ions include conventional devices such as bubble columns, spray columns, tray columns, and wet wall columns, as well as new gas-liquid devices. - Can be used with any type of equipment, including liquid contact equipment.
また、本発明で処理されるべきヨウ素及び／又はヨウ素
化合物を含む混合気体あるいは蒸気には、除去さるべき
任意の１度のヨウ素の外、たとえば２０００ｐｐｍ
程度の二酸化窒素及び／又は５０００ｐｐｍ 程度の
水分が含まれていて差し支えなく、それらの混在はヨウ
素類の吸収効率に対して、格別の悪影響を与えることが
ないことが、明らかにせられている。In addition, the mixed gas or vapor containing iodine and/or iodine compounds to be treated in the present invention may contain, for example, 2000 ppm of iodine in addition to any one degree of iodine to be removed.
It has been shown that there is no problem in containing about 5,000 ppm of nitrogen dioxide and/or about 5,000 ppm of water, and that their mixture does not have any particular adverse effect on the absorption efficiency of iodine.
従って、本発明を実施するための装置は、ヨウ素を含有
する気体を予め、処理することなく、そのまま、気φ液
接触装置に導入でき、後処理装置の簡素さと相俟って、
極めて簡単に構成することができる。即ち、本発明の方
法によれば、ヨウ素は不溶解性のヨウ素化物として沈澱
するから、容易に常法によって、それを分離することが
できる。そして、本発明の方法で廃棄物として除去され
るものはこの沈澱だけであるから、廃棄物の量は従来、
知られている乾式法に対しては勿論、何れの湿式法に対
比しても著しく少量であって、極めて有利である。Therefore, the apparatus for carrying out the present invention allows the iodine-containing gas to be directly introduced into the gas-φ-liquid contacting apparatus without being treated in advance, and together with the simplicity of the post-treatment apparatus,
It can be configured extremely easily. That is, according to the method of the present invention, iodine is precipitated as an insoluble iodide, which can be easily separated by a conventional method. Since this precipitate is the only thing that is removed as waste in the method of the present invention, the amount of waste is smaller than that of the conventional method.
The amount is extremely small compared to known dry methods as well as any wet method, which is extremely advantageous.
以下、本発明を実施例によって、より詳細に説明する。Hereinafter, the present invention will be explained in more detail with reference to Examples.
但し、本発明はそれらにより、限定されるものではない
。However, the present invention is not limited thereto.
実施故１」−
２０°Ｃの恒温水中で、１０關ｏｆ／ｌの硫酸銀水溶液
５０Ｉｌｌにヨウ素２００ｐｐｎ＋を含む乾燥空気を、
０．５１／ｗｉｎの流速で通気したところ、出口ガス中
のヨウ素濃度の経時変化は添付図１の通りで、通ガス量
２６タの時点のヨウ素の除去率は、９９．８８５％であ
った。この値を。Example 1 - Dry air containing 200 ppn+ of iodine was added to 50 Ill of a 10 f/l silver sulfate aqueous solution in constant temperature water at 20°C.
When aeration was performed at a flow rate of 0.51/win, the iodine concentration in the outlet gas changed over time as shown in attached Figure 1, and the iodine removal rate at a gas flow rate of 26 ta was 99.885%. . this value.
除染係数（＝大すロヨウ素１５度／出ロヨウ素濃度＝Ｄ
Ｆ）に換算するとＤＦ＝６．７Ｘ１０ になる。また
破過後の残存銀イオンの濃度は、０．０５ｐｐ−以下で
あった。Decontamination coefficient (= 15 degrees of iodine/concentration of iodine = D
When converted to F), it becomes DF=6.7X10. Further, the concentration of residual silver ions after breakthrough was 0.05 pp- or less.
これは始めに存在していた銀の９９．９９７７％以上が
有効に利用されていたことを意味するものである。This means that more than 99.9977% of the silver that was initially present was effectively utilized.
天狂例−２−
２０°Ｃの恒温槽中で、１０．５０及び１００ｍｍｏｌ
／ｌの硝酸銀水溶液に、ヨウ素２００ｐｐｍに酸化窒素
２０００１）Ｉ）Ｉ及び水５０００ ｐｐｍを含むＤＯ
Ｇ 模擬ガスを、０．５１／ｍｉｎの流速で通気した
とき、出口ガス中のヨウ素濃度は添付図２に示すような
経時変化を示した。この図から、ヨウ素の吸収量は硝酸
銀の濃度に、はぼ比例していることが判る。銀の有効利
用率は、何れの場合も９９．９９７７％以上であった。Tenkyo-2- 10.50 and 100 mmol in a constant temperature bath at 20°C
DO containing 200 ppm of iodine, 20,000 ppm of nitrogen oxide, I)I and 5,000 ppm of water in an aqueous solution of silver nitrate of 1/l.
When the G simulated gas was aerated at a flow rate of 0.51/min, the iodine concentration in the outlet gas showed a change over time as shown in the attached Figure 2. This figure shows that the amount of iodine absorbed is approximately proportional to the concentration of silver nitrate. The effective utilization rate of silver was 99.9977% or more in all cases.
また実施例１と実施例２の１０ｍｍｏｌ／ｌの場合を比
較すると、共存するＮＯｘはヨウ素の吸収に影響しない
事が判る。Further, when comparing the cases of 10 mmol/l in Example 1 and Example 2, it is found that the coexisting NOx does not affect the absorption of iodine.
実施例−１
実施例２と同様の実験条件で、硝酸１京度が４１０１／
Ｉ Ｎ硝酸銀ｌ震度が５０＋ｕｏｌ／ｌの水溶液を用い
て実験を行った。Example-1 Under the same experimental conditions as Example 2, 1 trillion degrees of nitric acid was
An experiment was conducted using an aqueous solution with an IN silver nitrate seismic intensity of 50+uol/l.
出口ガス中のヨウ素濃度の経時変化は添付図３に示した
通りであり、実施例２の５０＋＋ｍｏｌ／ｌの場合と比
較すると、ヨウ素の吸収は液中に共存する硝酸の影響を
殆ど受けないことが判る。この結果は、ＤＯＧ中のＮＯ
ｘが吸収されて、反応
３ＮＯ＋Ｈ０＝２８ＮＯ３＋ＮＯ
に従ってかなり大量に硝酸が生成しても、その影響は小
さいことを示すものである。The change over time in the iodine concentration in the outlet gas is shown in the attached Figure 3, and compared to the case of 50++ mol/l in Example 2, the absorption of iodine is hardly affected by nitric acid coexisting in the liquid. I understand. This result shows that NO in DOG
This shows that even if x is absorbed and nitric acid is produced in a fairly large amount according to the reaction 3NO+H0=28NO3+NO, the effect is small.
実施桝−生
実施例２と同様の実験条件で、ｌ濃度１２．５ｉｍｏｌ
／ｌの硫酸銀水溶液を用いて実験したところ、出口ガス
中のヨウ素濃度は添付図４のような経時変化を示した。Experimental box - Raw Under the same experimental conditions as in Example 2, the concentration of l was 12.5 imol.
When an experiment was conducted using an aqueous silver sulfate solution of /l, the iodine concentration in the outlet gas showed a change over time as shown in the attached Figure 4.
硫酸銀水溶液も硝酸銀水溶液と同様のヨウ素除去能力の
あることがわかった。また、破過後の残存銀イオンの濃
度は、０、Ｏ５ｐｐｍ以下であった。これは銀利用率９
９．９９８％以上に相当する。It was found that silver sulfate aqueous solution also has the same iodine removal ability as silver nitrate aqueous solution. Further, the concentration of residual silver ions after breakthrough was 0.05 ppm or less. This is silver usage rate 9
This corresponds to 9.998% or more.
添付図面１−４は本発明の方法の効果を説明する説明図
である。The attached drawings 1 to 4 are explanatory diagrams illustrating the effects of the method of the present invention.
Claims (1)
体あるいは蒸気を、少なくとも銀イオンを含む水溶液と
接触させ、該気体中のヨウ素を不溶性ヨウ素化物の沈澱
として除去することを特徴とするヨウ素の除去法。A method for removing iodine, which comprises bringing a mixed gas or vapor containing at least iodine and/or an iodine compound into contact with an aqueous solution containing at least silver ions, and removing the iodine in the gas as a precipitate of insoluble iodide.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61227048A JPS6380831A (en) | 1986-09-25 | 1986-09-25 | Removal of iodine in gas |
| EP87113910A EP0261662A3 (en) | 1986-09-25 | 1987-09-23 | Method for removal of iodine in gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61227048A JPS6380831A (en) | 1986-09-25 | 1986-09-25 | Removal of iodine in gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6380831A true JPS6380831A (en) | 1988-04-11 |
| JPS6348572B2 JPS6348572B2 (en) | 1988-09-29 |
Family
ID=16854709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61227048A Granted JPS6380831A (en) | 1986-09-25 | 1986-09-25 | Removal of iodine in gas |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0261662A3 (en) |
| JP (1) | JPS6380831A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH077099B2 (en) * | 1988-09-26 | 1995-01-30 | 動力炉・核燃料開発事業団 | Recovery and storage method of radioactive iodine by freeze-vacuum drying method |
| WO1995028714A1 (en) * | 1994-04-19 | 1995-10-26 | Joint Stock Company 'kkip' | Process and agents for removing iodine from the atmosphere |
| CN102371147B (en) * | 2010-08-23 | 2013-05-08 | 中国石油化工股份有限公司 | Preparation method of iodine removing agent |
| CN102371192B (en) * | 2010-08-23 | 2013-04-03 | 中国石油化工股份有限公司 | Preparation method of deiodination agent |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3429655A (en) * | 1966-02-09 | 1969-02-25 | Atomic Energy Commission | Method and filter for removing iodine from gases |
| DE2913329C2 (en) * | 1979-04-03 | 1984-11-22 | Dechema Deutsche Gesellschaft F. Chem. Apparatewesen E.V., 6000 Frankfurt | Process for the separation of traces of gaseous pollutants based on sulfur from exhaust gases by chemical absorption |
-
1986
- 1986-09-25 JP JP61227048A patent/JPS6380831A/en active Granted
-
1987
- 1987-09-23 EP EP87113910A patent/EP0261662A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0261662A3 (en) | 1988-06-15 |
| JPS6348572B2 (en) | 1988-09-29 |
| EP0261662A2 (en) | 1988-03-30 |
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