JPH0567200B2 - - Google Patents
Info
- Publication number
- JPH0567200B2 JPH0567200B2 JP62091736A JP9173687A JPH0567200B2 JP H0567200 B2 JPH0567200 B2 JP H0567200B2 JP 62091736 A JP62091736 A JP 62091736A JP 9173687 A JP9173687 A JP 9173687A JP H0567200 B2 JPH0567200 B2 JP H0567200B2
- Authority
- JP
- Japan
- Prior art keywords
- iodine
- zeolite
- silver
- collection device
- exhaust gas
- 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
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- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 58
- 229910052740 iodine Inorganic materials 0.000 claims description 58
- 239000011630 iodine Substances 0.000 claims description 58
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 38
- 239000010457 zeolite Substances 0.000 claims description 38
- 229910021536 Zeolite Inorganic materials 0.000 claims description 37
- 230000002285 radioactive effect Effects 0.000 claims description 18
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 15
- 229910052709 silver Inorganic materials 0.000 claims description 15
- 239000004332 silver Substances 0.000 claims description 15
- 229910052783 alkali metal Inorganic materials 0.000 claims description 11
- 150000001340 alkali metals Chemical class 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 229910001414 potassium ion Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 description 31
- 239000003463 adsorbent Substances 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000002901 radioactive waste Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical group [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 150000002497 iodine compounds Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052680 mordenite Inorganic materials 0.000 description 1
- VIJMMQUAJQEELS-UHFFFAOYSA-N n,n-bis(ethenyl)ethenamine Chemical compound C=CN(C=C)C=C VIJMMQUAJQEELS-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000003566 sealing material Substances 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
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】
〓産業上の利用分野〓
本発明は、原子力施設の焼却炉から排出される
排ガス等中の放射性ヨウ素を捕集するヨウ素捕集
装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an iodine collection device for collecting radioactive iodine in exhaust gas etc. discharged from an incinerator of a nuclear facility.
〓従来の技術〓
原子力発電所等の原子力施設では、発生した放
射性廃棄物のうち焼却可能な低中レベル固体廃棄
物は焼却炉で灰化することによつて減容される。〓Conventional technology〓 At nuclear power facilities such as nuclear power plants, among the radioactive waste generated, low and medium level solid waste that can be incinerated is reduced in volume by being incinerated in an incinerator.
このような焼却炉には、焼却によつて発生する
排ガス中の放射性ヨウ素を捕集してその濃度を測
定するヨウ素捕集装置が設置されており、ヨウ素
の捕集には一般にヨウ素吸着剤が使用されてい
る。 Such incinerators are equipped with iodine collection equipment that collects radioactive iodine in the exhaust gas generated by incineration and measures its concentration. Generally, iodine adsorbents are used to collect iodine. It is used.
従来ヨウ素吸着剤としては、ヨウ素化合物また
はアミンを添着した活性炭、例えばSnI2添着炭、
トリエチレンアミン（TEDA）添着炭、あるい
はＸ型ゼオライトに銀を担持させた吸着剤（以下
AgXで表す）が使われている。 Conventional iodine adsorbents include activated carbon impregnated with an iodine compound or amine, such as SnI 2 impregnated carbon,
Triethylene amine (TEDA) impregnated carbon or X-type zeolite adsorbent with silver supported (hereinafter referred to as
(represented by AgX) is used.
〓発明が解決しようとする問題点〓
しかしながら、焼却炉から排出される。排ガス
は高温で放射性ヨウ素の他にNOx、SOx、及び
HCl等の酸性ガス及び水蒸気を含んでいるため、
かかる従来のヨウ素吸着剤は十分なヨウ素吸着能
を示していない。〓Problems to be solved by the invention〓 However, it is discharged from the incinerator. The exhaust gas is high temperature and contains radioactive iodine as well as NOx, SOx, and
Because it contains acidic gases such as HCl and water vapor,
Such conventional iodine adsorbents do not exhibit sufficient iodine adsorption ability.
添着炭は高温或いは高温湿度下でのヨウ素捕集
効率が低く、特に常温で優れた吸着能を示す
TEDA添着炭は高温において、TEDAが揮発し
発火するという致命的問題がある。一方、AgX
は耐酸性が劣るため酸性ガスによつて捕集効率が
低下するという問題点があつた。更に、AgXは
Cl成分にも感応するので、目的とする放射性ヨウ
素の吸着能力が排ガス中のHClにより大巾に低下
させられるといつた問題点がある。 Impregnated carbon has low iodine capture efficiency at high temperatures or high humidity, but exhibits particularly excellent adsorption ability at room temperature.
TEDA-impregnated coal has the fatal problem of TEDA volatilizing and catching fire at high temperatures. On the other hand, AgX
has a problem in that its collection efficiency is reduced by acidic gases due to its poor acid resistance. Furthermore, AgX
Since it is also sensitive to Cl components, there is a problem in that the target adsorption ability for radioactive iodine is greatly reduced by HCl in the exhaust gas.
〓問題点を解決するための手段〓
本発明はかかる点に対処してなされたもので、
焼却炉排ガス中のHClによるヨウ素吸着能の低下
を防止し、安定に放射性ヨウ素を捕集することが
できるヨウ素捕集装置を提供しようとするもので
ある。〓Means for solving the problems〓 The present invention has been made in order to solve the problems.
The purpose of the present invention is to provide an iodine collection device that can prevent a decrease in iodine adsorption capacity due to HCl in incinerator exhaust gas and can stably collect radioactive iodine.
効率の好い捕集装置が提供できれば、それをそ
のまま排ガス系に入れ、排ガス中の放射性ヨウ素
を測定することもできる。 If an efficient collection device could be provided, it would be possible to directly introduce it into the exhaust gas system and measure radioactive iodine in the exhaust gas.
即ち、本発明はガス中の放射性ヨウ素を捕集す
るヨウ素捕集装置において、該ヨウ素捕集装置
が、アルカリ金属含有ゼオライトを前段とし、銀
含有ゼオライトを後段とする２層の吸着剤で構成
されることを特徴とするものである。 That is, the present invention provides an iodine collection device for collecting radioactive iodine in gas, and the iodine collection device is composed of two layers of adsorbent, with an alkali metal-containing zeolite in the first stage and a silver-containing zeolite in the second stage. It is characterized by:
本発明の前段で使用されるアルカリ金属含有ゼ
オライトとしては、天然産、合成品を問わず種々
のものが使用できる。例えば、Ｘ型ゼオライト、
Ｙ型ゼオライト、モルデナイト、ペンタシル型ゼ
オライトが好ましいが、Ｙ型ゼオライトが特に好
ましい。アルカリ金属としてはLi、Na、Ｋが好
ましいが、特にＫが好ましい。かかるアルカリ金
属含有ゼオライトは、ゼオライトをアルカリ金属
イオンを含む溶液を用い通常のイオン交換処理を
行なうことによつて容易に得ることができる。 As the alkali metal-containing zeolite used in the first stage of the present invention, various types can be used, regardless of whether they are naturally produced or synthetic. For example, type X zeolite,
Y-type zeolite, mordenite, and pentasil-type zeolite are preferred, and Y-type zeolite is particularly preferred. As the alkali metal, Li, Na, and K are preferred, and K is particularly preferred. Such an alkali metal-containing zeolite can be easily obtained by subjecting zeolite to a conventional ion exchange treatment using a solution containing alkali metal ions.
本発明の後段で使用される銀含有ゼオライトと
しては、Ｘ型ゼオライトまたはモルデナイトの銀
置換体（USP 3658467、USP 4088737）、或いは
シリカ対アルミナモル比が15以上の高シリカ系ゼ
オライトの銀置換体（特開昭60−225638号）が好
ましい。高シリカ系ゼオライトの銀置換体は銀担
持量が少なく、ヨウ素除去効率が高い上に、耐酸
性、耐熱性に優れているという特長を有し、特に
好ましい。 The silver-containing zeolite used in the latter stage of the present invention includes silver-substituted X-type zeolite or mordenite (USP 3658467, USP 4088737), or silver-substituted high-silica zeolite with a silica to alumina molar ratio of 15 or more (specially 60-225638) is preferred. Silver-substituted high-silica zeolites are particularly preferred because they have a small amount of silver supported, high iodine removal efficiency, and excellent acid resistance and heat resistance.
〓実施例〓
以下、本発明の概要を具体例を挙げて説明す
る。第１図は本発明のヨウ素捕集装置の一実施例
を示す構成図である。焼却炉１で発生した放射性
排ガスの一部をサンプリング管２より採取し、ヨ
ウ素捕集装置７で放射性ヨウ素を吸着捕集する。
吸着層を通過したガスは冷却器８、定流量弁９、
ポンプ１０を経て排気筒１１へ還流される。ヨウ
素捕集装置７は、前段にアルカリ金属含有ゼオラ
イト３、後段に銀含有ゼオライト４を充填したフ
イルタカートリツジ５とこれを保持するフイルタ
ホルダ６によつて構成される。〓Example〓 Hereinafter, the outline of the present invention will be explained by giving specific examples. FIG. 1 is a block diagram showing an embodiment of the iodine collection device of the present invention. A part of the radioactive exhaust gas generated in the incinerator 1 is collected from the sampling tube 2, and the iodine collector 7 adsorbs and collects radioactive iodine.
The gas that has passed through the adsorption layer is passed through a cooler 8, a constant flow valve 9,
It is returned to the exhaust pipe 11 via the pump 10. The iodine collection device 7 is composed of a filter cartridge 5 filled with an alkali metal-containing zeolite 3 at the front stage and a silver-containing zeolite 4 at the rear stage, and a filter holder 6 for holding the same.
また、サンプリング管２からヨウ素捕集装置７
に至る配管１３およびヨウ素捕集装置７から冷却
器８に至る配管１４には、保温材１２を被覆する
などの保温手段が設けられている。 Also, from the sampling tube 2 to the iodine collection device 7
The piping 13 leading to the iodine collector 7 and the piping 14 leading from the iodine collector 7 to the cooler 8 are provided with heat retaining means such as covering with a heat insulating material 12.
尚、ヨウ素捕集装置７は第２図に示すように、
フイルタカートリツジ５を保持するフイルタホル
ダ６にヒータ２１が埋込まれ、フイルタカートリ
ツジ５を加温できるようになつている。そのフイ
ルタカートリツジ５内には、入口付近に排ガス中
の塵を除去するダストフイルタ２２が設けられて
いる。フイルタカートリツジ５はパンチングメタ
ル２３で仕切り、上部にアルカリ金属含有ゼオラ
イト３を、下部に銀含有ゼオライト４を充填す
る。尚、図中の符号２４は排ガスの漏洩を防ぐシ
ール材である。 In addition, as shown in FIG. 2, the iodine collection device 7 is
A heater 21 is embedded in a filter holder 6 that holds the filter cartridge 5, so that the filter cartridge 5 can be heated. Inside the filter cartridge 5, a dust filter 22 is provided near the inlet for removing dust from the exhaust gas. The filter cartridge 5 is partitioned by punching metal 23, and the upper part is filled with alkali metal-containing zeolite 3, and the lower part is filled with silver-containing zeolite 4. Note that the reference numeral 24 in the figure is a sealing material that prevents leakage of exhaust gas.
次に上記構成の焼却炉排ガスヨウ素捕集装置の
操作について説明する。 Next, the operation of the incinerator exhaust gas iodine collection device having the above configuration will be explained.
焼却炉１において放射性廃棄物を焼却すること
によつて生じた排ガスは、ポンプ１０を作動する
ことによつてサンプリング管２を介してヨウ素捕
集装置７内にとり込まれる。とり込まれた排ガス
はヨウ素捕集装置７において排ガス中の放射性ヨ
ウ素が捕集されるが、その際排ガス中に含まれて
いるNOx、SOxおよびHCl等の酸性ガスの結露
による装置の腐食を防止するため、ヒーター２１
によつてフイルター部の温度を180℃以上に調整
する。 Exhaust gas generated by incinerating radioactive waste in the incinerator 1 is taken into the iodine collector 7 via the sampling pipe 2 by operating the pump 10. Radioactive iodine in the taken exhaust gas is collected in the iodine collection device 7, but at this time, corrosion of the device due to condensation of acidic gases such as NOx, SOx, and HCl contained in the exhaust gas is prevented. In order to
Adjust the temperature of the filter section to 180℃ or higher.
温度の上限については特に限定されないが、高
温にし過ぎると吸着性能の低下、エネルギーロス
の増加が起こるため、250℃以下が好ましい。 Although the upper limit of the temperature is not particularly limited, it is preferably 250° C. or lower, since too high a temperature will cause a decrease in adsorption performance and an increase in energy loss.
またヨウ素捕集装置７においては、前段のアル
カリ金属含有ゼオライトが後段の銀含有ゼオライ
トのガードベツドとして作用、HClをはじめその
他の酸性ガスを前もつて吸着除去するので、銀含
有ゼオライトの放射性ヨウ素の捕集効率の低下が
防止され安定した性能を発揮することができる。
使用するアルカリ金属含有ゼオライトと銀含有ゼ
オライトの比率は、排ガス中のHCl等の不純物濃
度によつて変りうるが、通常は100：１〜0.5：
１、好ましくは20：１〜１：１程度である。 In addition, in the iodine collection device 7, the alkali metal-containing zeolite in the former stage acts as a guard bed for the silver-containing zeolite in the latter stage, and adsorbs and removes HCl and other acidic gases in advance, so radioactive iodine is captured by the silver-containing zeolite. This prevents the collection efficiency from decreasing and provides stable performance.
The ratio of alkali metal-containing zeolite to silver-containing zeolite to be used may vary depending on the concentration of impurities such as HCl in the exhaust gas, but it is usually 100:1 to 0.5:
1, preferably about 20:1 to 1:1.
以上述べたようにして、一定時間排気ガスを通
気処理したフイルタカートリツジ５は放射線測定
装置によつてフイルタカートリツジ５内の放射性
ヨウ素からの放射線量が測定され、排ガス中の放
射性ヨウ素濃度が計算される。 As described above, the radiation dose of the filter cartridge 5 from which the exhaust gas has been aerated for a certain period of time is measured by the radiation measuring device from the radioactive iodine in the filter cartridge 5, and the radioactive iodine concentration in the exhaust gas is calculated. be done.
以下、本発明を実施例により説明する。 The present invention will be explained below using examples.
実施例 １
(1) 合成NaY型ゼオライト粉末（東洋曹達工業
(株)製）にバインダーとしてアルミナゾルを
Al2O3換算して10重量％添加し、充分混練し
た。混合後12〜20メツシユ（JISフイル）の大
きさの粒子に成型し、100℃で一晩乾燥後、空
気中で500℃、２時間焼成した。次いで、この
成型品を１規定の硝酸カリウム水溶液で処理
し、Naイオンの約95％をＫイオンに交換する。
この様にして得られたＫ交換Ｙ型ゼオライトを
空気中で500℃、24時間焼成し、吸着剤Ａとす
る。Example 1 (1) Synthetic NaY type zeolite powder (Toyo Soda Kogyo Co., Ltd.
Co., Ltd.) with alumina sol as a binder.
10% by weight in terms of Al 2 O 3 was added and thoroughly kneaded. After mixing, the mixture was formed into particles having a size of 12 to 20 meshes (JIS film), dried at 100°C overnight, and then calcined in air at 500°C for 2 hours. Next, this molded product is treated with a 1N potassium nitrate aqueous solution to exchange about 95% of the Na ions with K ions.
The K-exchanged Y-type zeolite thus obtained is calcined in air at 500°C for 24 hours to obtain adsorbent A.
(2) ゼオライトの合成を特開昭58−91032号公報
に準じて行なつた。(2) Zeolite was synthesized according to JP-A-58-91032.
原料として、ケイ酸、アルミン酸ソーダ、苛
性ソーダ、酒石酸を用い、表１に示す組成比の
反応混合物を調整し、オートクレーブに仕込ん
で撹拌しながら、160℃に加熱し、72時間結晶
化を行なつた。 Using silicic acid, sodium aluminate, caustic soda, and tartaric acid as raw materials, a reaction mixture with the composition ratio shown in Table 1 was prepared, charged into an autoclave, heated to 160°C with stirring, and crystallized for 72 hours. Ta.
表 １
SiO2／Al2O3 30（モル比）
H2O／SiO2 20 〃
OH-／SiO2 0.17 〃
Ａ／Al2O3 2.5 〃
Ａ：酒石酸
得られた生成物は表２に示したＸ線回折パター
ンを有し、SiO2／Al2O3比25.2のゼオライトであ
つた。 Table 1 SiO 2 /Al 2 O 3 30 (molar ratio) H 2 O / SiO 2 20 〃 OH - /SiO 2 0.17 〃 A/Al 2 O 3 2.5 〃 A: Tartaric acid The obtained products are shown in Table 2. It was a zeolite with a SiO 2 /Al 2 O 3 ratio of 25.2.
表 ２
ｄ（Å） 100I／Imax
11.32 54
10.13 39
3.88 100
3.74 52
3.67 30
Ｘ線回折パターンの測定は、通常の方法によ
つて行なわれる。 Table 2 d(Å) 100I/Imax 11.32 54 10.13 39 3.88 100 3.74 52 3.67 30 Measurement of the X-ray diffraction pattern is performed by a conventional method.
即ち、Ｘ線照射は銅のＫ−α線により記録装
置付のガイガーカウンター分光器を用い回折パ
ターンを得る。 That is, the X-ray irradiation uses K-α rays of copper to obtain a diffraction pattern using a Geiger counter spectrometer equipped with a recording device.
この回析パターンから相対強度100I／Imax
（Imaxは最も強い線）および格子間隔ｄ（単位
オングストロームÅ）を求める。 From this diffraction pattern, the relative intensity is 100I/Imax.
(Imax is the strongest line) and the lattice spacing d (unit: angstrom Å) are determined.
この様にして得られたゼオライト粉末にアル
ミナゾルをバインダーとしてアルミナ
（Al2O3）換算で15重量％添加し、充分混練し
た。 Alumina sol was added as a binder in an amount of 15% by weight in terms of alumina (Al 2 O 3 ) to the zeolite powder thus obtained, and the mixture was sufficiently kneaded.
混練後10〜16メツシユ（JISフルイ）の大き
さの粒子に成型し、110℃で一夜乾燥し、その
後空気中で500℃、２時間焼成した。 After kneading, the mixture was formed into particles having a size of 10 to 16 meshes (JIS sieve), dried at 110°C overnight, and then calcined in air at 500°C for 2 hours.
次いで、このゼオライト成型品を0.5規定硝
酸銀水溶液を用いて、充分銀イオン交換処理を
行なつた。 Next, this zeolite molded product was subjected to sufficient silver ion exchange treatment using a 0.5 N silver nitrate aqueous solution.
その後イオン交換水で水洗いし、110℃で一
夜乾燥し、空気中で500℃、２時間焼成し、吸
着剤Ｂとする。この銀交換ゼオライトの銀担持
量は9.7重量％である。 Thereafter, it was washed with ion-exchanged water, dried overnight at 110°C, and calcined in air at 500°C for 2 hours to obtain adsorbent B. The amount of silver supported on this silver-exchanged zeolite was 9.7% by weight.
(3) 内径20mmのフイルタカートリツジの上段に吸
着剤Ａを12g、下段に吸着剤Ｂを12gを充填し、
下記の組成のガスを8N−ｌ／分、200℃の条件
で前記カートリツジへ供給した。(3) Fill the upper stage of a filter cartridge with an inner diameter of 20 mm with 12 g of adsorbent A, and the lower stage with 12 g of adsorbent B.
A gas having the following composition was supplied to the cartridge at 8 N-l/min and at 200°C.
ガスの組成はCO23％、NO2200ppm、
SO2500ppm、HCl400ppm、H2O9％、
CH3I1310.5mm／m3、残りは空気である。 The composition of the gas is CO2 3%, NO2 200ppm,
SO2 500ppm, HCl400ppm, H2O9 %,
CH 3 I 131 0.5mm/m 3 , the rest is air.
３時間通気処理後、吸着剤Ａ、Ｂ上の放射性
ヨウ素量を測定し、ヨウ素の捕集効率を求めた
ところ97.0％であつた。即ち、ガス中のヨウ素
を効率好く捕集することができた。 After aeration treatment for 3 hours, the amount of radioactive iodine on adsorbents A and B was measured, and the iodine collection efficiency was determined to be 97.0%. That is, iodine in the gas could be efficiently collected.
比較例 １
実施例１において、吸着剤をTEDA30％を添
着させた活性炭にかえヨウ素捕集テストを行なつ
たところ、180℃で吸着剤が発火し、捕集効率の
測定は不能であつた。Comparative Example 1 In Example 1, when an iodine collection test was conducted by replacing the adsorbent with activated carbon impregnated with 30% TEDA, the adsorbent ignited at 180°C, making it impossible to measure the collection efficiency.
また、吸着剤をSnI25％添着させた活性炭にか
え同様のテストを行なつたところ、180℃におけ
る放射性ヨウ素の捕集効率は70.0％であつた。 When a similar test was conducted using activated carbon impregnated with 5% SnI 2 as the adsorbent, the radioactive iodine collection efficiency at 180°C was 70.0%.
即ち、ガス中のヨウ素は効率好く捕集できなか
つた。 That is, iodine in the gas could not be efficiently collected.
実施例 ２
実施例１において、吸着剤Ａの充填量、HCl濃
度を夫々60g、400ppmとした外は同じ条件で放
射性ヨウ素の捕集テストを行なつたところ、ヨウ
素捕集効率は98.5％であつた。即ち、ガス中のヨ
ウ素を効率好く捕集できた。Example 2 A radioactive iodine collection test was conducted under the same conditions as in Example 1, except that the filling amount of adsorbent A and the HCl concentration were 60 g and 400 ppm, respectively, and the iodine collection efficiency was 98.5%. Ta. That is, iodine in the gas could be efficiently collected.
比較例 ２
実施例２において、吸着剤Ａを充填しないとき
のヨウ素捕集効率は31.7％であつた。即ち、ガス
中のヨウ素を効率好く捕集できなかつた。Comparative Example 2 In Example 2, the iodine collection efficiency when not filled with adsorbent A was 31.7%. That is, iodine in the gas could not be efficiently collected.
〓発明の効果〓
以上の説明から明らかなように、本発明のヨウ
素捕集装置は、排ガス中にHClが存在してもヨウ
素捕集効率を高く維持でき、焼却炉排ガス中の放
射性ヨウ素濃度を精度良く安定して測定すること
ができるとともに、高価な銀を用いたヨウ素捕集
剤剤の消費量が少なくてすみ、運転コストを安く
することができる。〓Effects of the Invention〓 As is clear from the above explanation, the iodine collection device of the present invention can maintain high iodine collection efficiency even when HCl is present in the exhaust gas, and can reduce the radioactive iodine concentration in the incinerator exhaust gas. In addition to being able to perform accurate and stable measurements, the amount of iodine scavenger agent that uses expensive silver can be reduced, resulting in lower operating costs.
第１図は本発明のヨウ素捕集装置の一実施例を
示す構成図、第２図はヨウ素捕集装置の他の実施
例を示す断面図である。
１………焼却炉、２……サンプリング管、３…
…アルカリ金属含有ゼオライト、４……銀含有ゼ
オライト、７………ヨウ素捕集装置。
FIG. 1 is a block diagram showing one embodiment of the iodine collection device of the present invention, and FIG. 2 is a sectional view showing another embodiment of the iodine collection device. 1...Incinerator, 2...Sampling tube, 3...
...Alkali metal-containing zeolite, 4...Silver-containing zeolite, 7...Iodine collection device.
Claims (1)
に銀含有ゼオライトを設置したことを特徴とする
ガス中の放射性ヨウ素を捕集するためのヨウ素捕
集装置。 ２ アルカリ金属含有ゼオライトがカリウムイオ
ンで置換したＹ型ゼオライトである特許請求の範
囲第１項記載のヨウ素捕集装置。 ３ 銀含有ゼオライトがアルミナに対するシリカ
のモル比が15以上であるゼオライトに銀を担持さ
せた高シリカ系の銀置換型合成ゼオライトである
特許請求の範囲第１項記載のヨウ素捕集装置。[Scope of Claims] 1. An iodine collection device for collecting radioactive iodine in gas, characterized in that an alkali metal-containing zeolite is installed in the first stage and a silver-containing zeolite is installed in the second stage. 2. The iodine collection device according to claim 1, wherein the alkali metal-containing zeolite is a Y-type zeolite substituted with potassium ions. 3. The iodine collection device according to claim 1, wherein the silver-containing zeolite is a high-silica silver-substituted synthetic zeolite in which silver is supported on a zeolite having a molar ratio of silica to alumina of 15 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62091736A JPS63256898A (en) | 1987-04-14 | 1987-04-14 | Iodine monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62091736A JPS63256898A (en) | 1987-04-14 | 1987-04-14 | Iodine monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63256898A JPS63256898A (en) | 1988-10-24 |
| JPH0567200B2 true JPH0567200B2 (en) | 1993-09-24 |
Family
ID=14034803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62091736A Granted JPS63256898A (en) | 1987-04-14 | 1987-04-14 | Iodine monitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63256898A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2536104B2 (en) * | 1988-11-19 | 1996-09-18 | トヨタ自動車株式会社 | Exhaust gas purification catalyst |
| JP4502729B2 (en) * | 2004-07-02 | 2010-07-14 | 千代田化工建設株式会社 | Method for removing iodine from organic acids |
| JP4952413B2 (en) * | 2007-07-09 | 2012-06-13 | 宇部興産株式会社 | Etching exhaust gas treatment apparatus and etching exhaust gas treatment method |
| JP5221245B2 (en) * | 2008-08-25 | 2013-06-26 | 三菱電機株式会社 | Iodine sampler |
| JP2011220923A (en) * | 2010-04-13 | 2011-11-04 | Mitsubishi Electric Corp | Radioactive substance monitor system |
| JP5999473B2 (en) * | 2012-03-14 | 2016-09-28 | 国立大学法人名古屋大学 | Collection unit, detector for radioactive gas monitor, and radioactive gas monitor |
| TW201627053A (en) * | 2014-12-26 | 2016-08-01 | Rasa Ind Ltd | Filler for filter vent, and filtered venting apparatus |
| JP6326548B2 (en) * | 2015-03-12 | 2018-05-16 | ラサ工業株式会社 | Filter vent filler and filter vent device |
| JP6841481B2 (en) * | 2016-05-24 | 2021-03-10 | 株式会社ササクラ | Method for treating polarizing plate manufacturing waste liquid |
-
1987
- 1987-04-14 JP JP62091736A patent/JPS63256898A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63256898A (en) | 1988-10-24 |
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