JPS63307103A - Method for removing ruthenium in nitric acid solution - Google Patents
Method for removing ruthenium in nitric acid solutionInfo
- Publication number
- JPS63307103A JPS63307103A JP14314487A JP14314487A JPS63307103A JP S63307103 A JPS63307103 A JP S63307103A JP 14314487 A JP14314487 A JP 14314487A JP 14314487 A JP14314487 A JP 14314487A JP S63307103 A JPS63307103 A JP S63307103A
- Authority
- JP
- Japan
- Prior art keywords
- nitric acid
- acid solution
- ruo4
- ions
- ruthenium
- 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
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 7
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 title claims 7
- 229910052707 ruthenium Inorganic materials 0.000 title claims 7
- 229910001927 ruthenium tetroxide Inorganic materials 0.000 claims abstract description 10
- 239000007800 oxidant agent Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 6
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 claims description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 10
- 150000002500 ions Chemical class 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 239000007791 liquid phase Substances 0.000 abstract description 2
- -1 nitrosyl ions Chemical class 0.000 abstract description 2
- 239000012808 vapor phase Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012958 reprocessing Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000002927 high level radioactive waste Substances 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
- C01B21/267—Means for preventing deterioration or loss of catalyst or for recovering lost catalyst
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は再処理プラント機器に係り、特に、硝酸溶液取
扱い機器の耐食性を向上するのに好適な硝酸溶液中のＲ
ｕ Ｏａ除去法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to reprocessing plant equipment, and in particular, R in a nitric acid solution suitable for improving the corrosion resistance of equipment handling nitric acid solution.
u Regarding Oa removal method.
原子燃料再処理プラントにおける高レベル廃液濃縮・貯
蔵系、酸回収系等の硝酸溶液取扱機器は、核分裂生成物
（Ｆ Ｐ）を多量に含む高濃度、沸騰条件の硝酸を扱う
ため、腐食環境が厳しく機器構造物の腐食が問題になる
といわれている。これらについては、エム・ベネデイク
１−５のニュークリア・ケミカル・エンジニアリング、
第４９１頁において論じられている（Ｍ 、 Ｂｅｎｅ
ｄｉｃｔ ： ＮｕｃｌｅａｎＣｈｅｎｉｃａｌ Ｅｎ
ｇｉｎｅｅｒｉｎｇ、 ｐ ４９１ （１９８１）Ｍ
ｃＥｎａｎ −Ｈｉｌｌ）。Equipment handling nitric acid solutions such as high-level waste liquid concentration/storage systems and acid recovery systems in nuclear fuel reprocessing plants handle highly concentrated and boiling nitric acid containing large amounts of fission products (FP), so they are exposed to corrosive environments. Corrosion of equipment structures is said to be a serious problem. Regarding these, Nuclear Chemical Engineering of M. Benedik 1-5,
Discussed on page 491 (M, Bene
dict: NucleanChemical En
gineering, p 491 (1981) M
cEnan-Hill).
硝酸取扱機器の腐食に大きな影響をおよぼすのは、硝酸
そのものと硝酸中に含まれる各種のＦＰイオンである。It is the nitric acid itself and the various FP ions contained in the nitric acid that have a major effect on the corrosion of equipment that handles nitric acid.
このうち硝酸は、硝酸取扱機器である以上さけることは
できないが、ＦＰイオンについては何らかの対策を立て
うる。ＦＰイオンの中でも酸に力の強いＣｅ、Ｃｒ、Ｒ
ｕ等が腐食に影響を及ぼすといわれているが、特にＲｕ
は強酸化性のため腐食加速効果が大きい。従来、これら
のＦＰイオンの影響を除外しようとする試みは種々なさ
れているが、実用的、かつ、効果的なものは少ない。Of these, nitric acid cannot be avoided since the equipment handles nitric acid, but some measures can be taken against FP ions. Among the FP ions, Ce, Cr, and R are strong against acids.
Ru, etc. are said to have an effect on corrosion, but especially Ru
has a strong corrosion accelerating effect due to its strong oxidizing properties. Conventionally, various attempts have been made to eliminate the influence of these FP ions, but few have been practical and effective.
本発明の目的は、硝酸溶液中に含まれる腐食加速性のＲ
ｕイオンを効果的に除去することにある。The object of the present invention is to reduce corrosion-accelerating R contained in nitric acid solution.
The objective is to effectively remove U ions.
硝酸溶液中に含まれるＦＰのＲｕイオンは、ＲｕＮＯ３
＋の形態をとるニトロシルイオンとしてその大部分が存
在するが、その一部が硝酸の酸化力によってＲｕ Ｏ４
に酸にされ、これが機器構造材の腐食を加速する。従っ
て、上記目的を達するには、親物質であるＲｕＮＯ３＋
を除去するが、腐食因子であるＲｕＯ４を除去する必要
がある。The Ru ions of FP contained in the nitric acid solution are RuNO3
Most of the nitrosyl ions exist in the + form, but some of them are converted to RuO4 by the oxidizing power of nitric acid.
acid, which accelerates corrosion of equipment construction materials. Therefore, in order to achieve the above purpose, the parent substance RuNO3+
However, it is necessary to remove RuO4, which is a corrosion factor.
本発明は硝酸溶液中に存在するＲ ｕ Ｎ Ｏ’十を溶
液中に酸化剤、例えば、オゾン（０８）や酸素（０２）
を吹き込み、強制的にＲｕＮＯ３＋をＲｕ０ａに変化さ
せる。Ｒｕ Ｏ４は極めて揮発性が高いため、生成した
ＲｕＯ４はすみやかに揮発、し、硝酸溶液から気相に移
行し、液相中のＲｕＮ０”＋。The present invention combines R u N O' present in a nitric acid solution with an oxidizing agent such as ozone (08) or oxygen (02)
was injected to forcibly change RuNO3+ to Ru0a. Since RuO4 is extremely volatile, the generated RuO4 quickly volatilizes and moves from the nitric acid solution to the gas phase, forming RuN0''+ in the liquid phase.
ＲｕＯ＋は、はぼ、１００％除去される。気相に移行し
たＲｕ０ａはガス状であるが、ある種のトラップ、例え
ばプラスチック等の有キ物により容易に捕集できるし、
又は、還元性のガスにより、例えば、Ｎｏガスによりす
みやかにＲｕＯ２の固体に還元される。即ち、
なお、固体になったＲｕＯ２は腐食性をもたない。Almost 100% of RuO+ is removed. Although Ru0a that has transitioned to the gas phase is in a gaseous state, it can be easily captured by a certain type of trap, such as a material such as plastic.
Alternatively, it is quickly reduced to solid RuO2 by a reducing gas, for example, No gas. That is, RuO2 that has become solid does not have corrosive properties.
図中、１は蒸発缶でＲ−ｕ−符を含む硝酸溶液は２から
供給され、加熱蒸発される。３は酸化剤（オゾン）タン
クである。酸化剤は蒸発缶１内の液中に供給される。蒸
発した硝酸溶液５に含まれるＲＩＪＯ４は還元剤８、本
実施例ではＮｏガスによりＲｕ０ｚとなりトラップ４で
捕集される。その後の硝酸蒸気６は、次工程へ送られる
。又、濃縮された缶液７も次工程へ送られる。In the figure, 1 is an evaporator, and a nitric acid solution containing R-u- is supplied from 2 and heated and evaporated. 3 is an oxidizer (ozone) tank. The oxidizing agent is supplied to the liquid in the evaporator 1. RIJO4 contained in the evaporated nitric acid solution 5 is converted into Ru0z by the reducing agent 8, in this example No gas, and is collected by the trap 4. The subsequent nitric acid vapor 6 is sent to the next step. Further, the concentrated can liquid 7 is also sent to the next process.
第２図は本実施例の場合の液中のＲｕ量の変化を示した
図である。３０００ｐｐｍのＲｕを含む３規定の硝酸溶
液を１００℃に加熱した場合、０８の吹き込みがない場
合はＲｕの極く一部が自然酸化されて消失するのみであ
るが、反応当量以上の０８を吹きこんだ場合は四時間以
下で検出限界以下となる。FIG. 2 is a diagram showing changes in the amount of Ru in the liquid in this example. When a 3N nitric acid solution containing 3,000 ppm of Ru is heated to 100°C, only a small portion of the Ru will naturally oxidize and disappear if 08 is not blown into the solution, but if 08 is blown in an amount greater than the reaction equivalent, If it is contaminated, it will be below the detection limit in less than four hours.
なお、本発明は、再処理プラントの硝酸回収蒸発缶のみ
ならず、Ｒｕを含む他の硝酸取扱機器にも適用できるこ
とは言うまでもない。It goes without saying that the present invention is applicable not only to a nitric acid recovery evaporator in a reprocessing plant but also to other equipment that handles nitric acid containing Ru.
本発明によれば、硝酸溶液中に存在し、機器材料腐食の
要因となるＲｕを効果的に除去することができる。According to the present invention, Ru that is present in a nitric acid solution and causes corrosion of equipment materials can be effectively removed.
第１図は本発明の一実施例を示す硝酸回収蒸発装置の系
統図、第２図は液中のＲｕ量の変化を示す説明図である
。
１・・・硝酸回収蒸発缶、３・・・酸化剤容器、４・・
何−ラ芽 １ 目
＄２ 目
ｙ１町 （＜ｈ）FIG. 1 is a system diagram of a nitric acid recovery and evaporation device showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing changes in the amount of Ru in the liquid. 1... Nitric acid recovery evaporator, 3... Oxidizer container, 4...
What-ra bud 1st $2 y1 town (<h)
Claims (1)
とにより、前記硝酸溶液中の前記ルテニウムを揮発性の
四酸化ルテニウムにかえ、前記硝酸溶液中から除去する
ことを特徴とする硝酸溶液中のルテニウムの除去法。 ２、特許請求の範囲第１項において、 揮発性の四酸化ルテニウムに還元剤を添加し、これを二
酸化ルテニウムにかえ、トラップで捕集することを特徴
とする硝酸溶液中のルテニウムの除去法。 ３、前記酸化剤としてオゾンもしくは酸素を用いること
を特徴とする特許請求の範囲第１項記載の硝酸溶液中の
ルテニウムの除去法。 ４、前記還元剤として亜硝酸ガスを用いることを特徴と
する特許請求の範囲第２項記載の硝酸溶液中のルテニウ
ムの除去法。[Claims] 1. By adding an oxidizing agent to a nitric acid solution containing ruthenium, the ruthenium in the nitric acid solution is converted into volatile ruthenium tetroxide and removed from the nitric acid solution. A method for removing ruthenium in nitric acid solution. 2. A method for removing ruthenium from a nitric acid solution according to claim 1, which comprises adding a reducing agent to volatile ruthenium tetroxide to convert it into ruthenium dioxide, which is collected in a trap. 3. The method for removing ruthenium from a nitric acid solution according to claim 1, characterized in that ozone or oxygen is used as the oxidizing agent. 4. The method for removing ruthenium from a nitric acid solution according to claim 2, characterized in that nitrite gas is used as the reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14314487A JPS63307103A (en) | 1987-06-10 | 1987-06-10 | Method for removing ruthenium in nitric acid solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14314487A JPS63307103A (en) | 1987-06-10 | 1987-06-10 | Method for removing ruthenium in nitric acid solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63307103A true JPS63307103A (en) | 1988-12-14 |
Family
ID=15331955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14314487A Pending JPS63307103A (en) | 1987-06-10 | 1987-06-10 | Method for removing ruthenium in nitric acid solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63307103A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014048084A (en) * | 2012-08-30 | 2014-03-17 | Japan Atomic Energy Agency | Method of separating and capturing ruthenium |
| JP2015125025A (en) * | 2013-12-26 | 2015-07-06 | 株式会社Ihi | Method and device for removing ruthenium in high-level radioactive waste liquid |
-
1987
- 1987-06-10 JP JP14314487A patent/JPS63307103A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014048084A (en) * | 2012-08-30 | 2014-03-17 | Japan Atomic Energy Agency | Method of separating and capturing ruthenium |
| JP2015125025A (en) * | 2013-12-26 | 2015-07-06 | 株式会社Ihi | Method and device for removing ruthenium in high-level radioactive waste liquid |
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