JP2809733B2 - Molten salt electrorefining equipment - Google Patents
Molten salt electrorefining equipmentInfo
- Publication number
- JP2809733B2 JP2809733B2 JP20966989A JP20966989A JP2809733B2 JP 2809733 B2 JP2809733 B2 JP 2809733B2 JP 20966989 A JP20966989 A JP 20966989A JP 20966989 A JP20966989 A JP 20966989A JP 2809733 B2 JP2809733 B2 JP 2809733B2
- Authority
- JP
- Japan
- Prior art keywords
- solid cathode
- cadmium
- molten salt
- anode
- fuel
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Electrolytic Production Of Metals (AREA)
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は高速増殖炉の使用済金属燃料を再処理するた
めの溶融塩電解精製装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a molten salt electrorefining apparatus for reprocessing spent metal fuel in a fast breeder reactor.
（従来の技術） 従来、高速増殖炉発電プラントから発生する使用済金
属燃料を再処理して燃料中に含まれるウラン，プルトニ
ウムなどの有用な燃料成分を濃縮回収し、かつ不要な核
***生成物を分離する装置として、第３図に示すような
溶融塩電解精製装置が考えられている。この溶融塩電解
精製装置は電解槽５内の液体カドミウム３を陽極とする
一方、液体カドミウム３の上部に配置されたKCl−LiCl
などの電解質塩化物４中に棒状の固体陰極１を配置て構
成されており、使用済金属燃料６を液体カドミウム３中
に溶解させると共に上記両極間に電圧を印加して電気分
解を行ない、液体カドミウム３中に溶解したウラン，プ
ルトニウムなどの燃料成分２を固体陰極１の表面に析出
させて回収するものである。(Prior art) Conventionally, spent metal fuel generated from a fast breeder reactor power plant is reprocessed to concentrate and recover useful fuel components such as uranium and plutonium contained in the fuel and to remove unnecessary fission products. As an apparatus for separation, an electrolytic refining apparatus for molten salt as shown in FIG. 3 has been considered. This molten salt electrorefining apparatus uses the liquid cadmium 3 in the electrolytic cell 5 as an anode, while the KCl-LiCl
A rod-shaped solid cathode 1 is disposed in an electrolyte chloride 4 such as a liquid electrolyte. The spent metal fuel 6 is dissolved in the liquid cadmium 3 and a voltage is applied between the two electrodes to perform electrolysis. The fuel component 2 such as uranium or plutonium dissolved in cadmium 3 is deposited on the surface of the solid cathode 1 and recovered.
（発明が解決しようとする課題） ところで、このような溶融塩電解精製装置では固体陰
極１の下方に陽極としての液体カドミウム３が配置され
ているため、固体陰極１を流れる電流の密度が固体陰極
１の下部のほうが相対的に高くなる。その結果、固体陰
極１の下部付近に例えばデンドライト（樹脂状析出物）
などの偏析が生じ、これが局部的に成長して液体カドミ
ウム３と接触し、電気的なショートを起こす。このた
め、それ以降の再処理運転を行なうことができなくな
り、固定陰極１の析出物として回収される燃料成分２の
回収量が制限されるという問題があった。(Problems to be Solved by the Invention) In such a molten salt electrorefining apparatus, since the liquid cadmium 3 as an anode is disposed below the solid cathode 1, the density of current flowing through the solid cathode 1 is reduced. The lower part of 1 is relatively higher. As a result, for example, dendrites (resin-like precipitates)
Segregation occurs, which grows locally and comes into contact with the liquid cadmium 3 to cause an electrical short. For this reason, the subsequent reprocessing operation cannot be performed, and there has been a problem in that the amount of the fuel component 2 recovered as a deposit on the fixed cathode 1 is limited.
本発明はこのような問題点に鑑みてなされたもので、
１回の再処理運転で得られる燃料成分の回収量を増大で
き、効率的な再処理運転を実施できる溶融塩電解精製装
置を提供することを目的とする。The present invention has been made in view of such problems,
It is an object of the present invention to provide a molten salt electrorefining apparatus capable of increasing the amount of recovered fuel components in one reprocessing operation and performing an efficient reprocessing operation.
［発明の構成］ （課題を解決するための手段） 上記目的を達成するために本発明は、高速増殖炉の使
用済金属燃料を電解槽内の陽極カドミウム中に溶解さ
せ、カドミウム中に溶解した燃料成分を電気分解により
電解質塩化物中に配置された固体陰極の表面に析出させ
て回収する溶融塩電解精製装置において、陽極カドミウ
ムを電解槽内における固体陰極よりも下側に設けるとと
もに、陽極カドミウムに対面する固体陰極の下部面を覆
うように、固体陰極より径の大きい円板状の絶縁板を設
けたものである。[Constitution of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention dissolves spent metal fuel of a fast breeder reactor in anode cadmium in an electrolytic cell and dissolves it in cadmium. In a molten salt electrorefining apparatus that deposits and recovers fuel components on the surface of a solid cathode placed in an electrolyte chloride by electrolysis, anode cadmium is provided below the solid cathode in the electrolytic cell and anode cadmium is provided. A disk-shaped insulating plate having a diameter larger than that of the solid cathode is provided so as to cover a lower surface of the solid cathode facing the solid cathode.
（作 用） 本発明では固体陰極の下部に固体陰極より径の大きい
円板状の絶縁板を設けることにより、陽極と陰極間の電
流分布が固体陰極の側面に対し垂直に流れる電流分布と
なるので、使用済金属燃料に含まれるウラン，プルトニ
ウムなどの燃料成分を固体陰極の表面に均一に析出させ
ることができ、固体陰極の下部付近に偏析する析出物と
陽極カドミウムとの電気的ショートを防止することがで
きる。(Operation) In the present invention, a current distribution between the anode and the cathode becomes a current distribution flowing perpendicular to the side surface of the solid cathode by providing a disc-shaped insulating plate having a diameter larger than that of the solid cathode below the solid cathode. As a result, fuel components such as uranium and plutonium contained in spent metal fuel can be uniformly deposited on the surface of the solid cathode, preventing an electrical short circuit between the precipitate segregating near the bottom of the solid cathode and anode cadmium. can do.
（実施例） 以下、図面を参照して本発明の実施例を説明する。(Example) Hereinafter, an example of the present invention is described with reference to drawings.
第１図は本発明の一実施例を示し、図中１は固体陰
極、２は燃料成分、３は液体カドミウム、４は電解質塩
化物、５は電解槽、６は使用済金属燃料であり、これら
は第３図に示したものと同一のものである。また、７は
固体陰極１の下部に設けられた円板状の絶縁板であり、
この絶縁板７は固体陰極１より径が大きくなっている。FIG. 1 shows an embodiment of the present invention, wherein 1 is a solid cathode, 2 is a fuel component, 3 is liquid cadmium, 4 is an electrolyte chloride, 5 is an electrolytic cell, 6 is a spent metal fuel, These are the same as those shown in FIG. Reference numeral 7 denotes a disc-shaped insulating plate provided below the solid cathode 1, and
The diameter of the insulating plate 7 is larger than that of the solid cathode 1.
第２図（ａ）は固体陰極１の下部に固体陰極１と同径
の絶縁板７を取付けた場合の電位分布を示し、同図
（ｂ）は固体陰極１の下部に固体陰極１より径の大きい
絶縁板７を取付けた場合の電位分布を示したものであ
る。この図からわかるように固体陰極１の下部に固体陰
極１と同径の絶縁板７を取付けた場合は固体陰極１の下
部付近に電流密度が局所的に高いところが発生するが、
固体陰極１の下部に固体陰極１より径の大きい絶縁板７
を取付けた場合には陽極（液体カドミウム３）と固体陰
極１間の電流分布が固体陰極１の側面に垂直に流れる電
流分布（第２図の等電位線８に対し垂直に電流が流れ
る）となるので、使用済金属燃料６に含まれるウラン，
プルトニウムなどの燃料成分２を固体陰極１の表面に均
一に析出させることができる、固体陰極１の下部付近に
偏析する析出物と液体カドミウム３との電気的ショート
を防止することができる。FIG. 2A shows a potential distribution when an insulating plate 7 having the same diameter as the solid cathode 1 is attached to the lower part of the solid cathode 1, and FIG. 4 shows a potential distribution when an insulating plate 7 having a large value is attached. As can be seen from this figure, when an insulating plate 7 having the same diameter as the solid cathode 1 is attached to the lower part of the solid cathode 1, a locally high current density is generated near the lower part of the solid cathode 1.
An insulating plate 7 having a diameter larger than that of the solid cathode 1 below the solid cathode 1
Is attached, the current distribution between the anode (liquid cadmium 3) and the solid cathode 1 is the current distribution flowing perpendicular to the side surface of the solid cathode 1 (current flows perpendicular to the equipotential line 8 in FIG. 2). Uranium contained in the spent metal fuel 6,
It is possible to uniformly deposit the fuel component 2 such as plutonium on the surface of the solid cathode 1, and it is possible to prevent an electric short circuit between the segregated deposit near the lower portion of the solid cathode 1 and the liquid cadmium 3.
従って、本実施例では固体陰極１の下部付近に偏析し
た析出物が局部的に成長して液体カドミウム３と接触す
ることがないので、１回の再処理運転で得られる燃料成
分の回収量を増大でき、効率的な再処理運転を実施でき
る。Therefore, in the present embodiment, the segregated precipitate near the lower portion of the solid cathode 1 does not grow locally and does not come into contact with the liquid cadmium 3, so that the recovered amount of the fuel component obtained by one reprocessing operation can be reduced. It can be increased and an efficient reprocessing operation can be performed.
なお、第２図（ｃ）に示すように固体陰極１の下部に
スカート状の円形絶縁板７を設けても同様の効果が得ら
れる。The same effect can be obtained by providing a skirt-shaped circular insulating plate 7 below the solid cathode 1 as shown in FIG. 2 (c).
［発明の効果］ 以上説明したように本発明は、高速増殖炉の使用済金
属燃料を電解槽内の陽極カドミウム中に溶解させ、前記
カドミウム中に溶解した燃料成分を電気分解により電解
質塩化物中に配置された固体陰極の表面に析出させて回
収する溶融塩電解精製装置において、前記固体陰極の下
部に固体陰極より径の大きい円板状の絶縁板を設けた前
記固体陰極の下部に絶縁板を設けたものである。[Effects of the Invention] As described above, the present invention dissolves a spent metal fuel of a fast breeder reactor into anode cadmium in an electrolytic cell, and electrolyzes the fuel component dissolved in the cadmium into an electrolyte chloride. In a molten salt electrorefining apparatus that precipitates and recovers on the surface of a solid cathode disposed in a solid cathode, a disc-shaped insulating plate having a diameter larger than that of the solid cathode is provided below the solid cathode. Is provided.
従って、陽極と陰極間の電流分布が固体陰極の側面に
垂直に流れる電流分布となるので、使用済金属燃料に含
まれるウラン，プルトニウムなどの燃料成分を固体陰極
の表面に均一に析出させることができ、１回の再処理運
転で得られる燃料成分の回収量が増大し、溶融塩電解精
製装置の処理能力を高めることができる。Therefore, since the current distribution between the anode and the cathode is a current distribution flowing perpendicularly to the side surface of the solid cathode, fuel components such as uranium and plutonium contained in the spent metal fuel can be uniformly deposited on the surface of the solid cathode. As a result, the amount of recovered fuel components obtained by one reprocessing operation is increased, and the processing capacity of the molten salt electrorefining apparatus can be increased.
第１図は本発明の一実施例を示す溶融塩電解精製装置の
断面図、第２図は同実施例の作用を説明するための電位
分布図、第３図は従来の溶融塩電解精製装置の断面図で
ある。 １……固体陰極、２……燃料成分、３……液体カドミウ
ム、４……電解質塩化物、５……電解槽、６……使用済
金属燃料、７……絶縁板。FIG. 1 is a cross-sectional view of a molten salt electrorefining apparatus showing one embodiment of the present invention, FIG. 2 is a potential distribution diagram for explaining the operation of the embodiment, and FIG. FIG. DESCRIPTION OF SYMBOLS 1 ... Solid cathode, 2 ... Fuel component, 3 ... Liquid cadmium, 4 ... Electrolyte chloride, 5 ... Electrolyzer, 6 ... Spent metal fuel, 7 ... Insulating plate.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 掛樋 勲 東京都港区芝浦１丁目１番１号 株式会 社東芝本社事務所内 (72)発明者 菊田 和幸 神奈川県川崎市川崎区浮島町４―１ 日 本原子力事業株式会社研究所内 (72)発明者 東海林 裕一 神奈川県川崎市川崎区浮島町４―１ 日 本原子力事業株式会社研究所内 (56)参考文献 特開 平３−73896（ＪＰ，Ａ) 特開 平３−73897（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Isao Kakehi 1-1-1, Shibaura, Minato-ku, Tokyo Inside the head office of Toshiba Corporation (72) Inventor Kazuyuki Kikuta 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki-ku, Kawasaki-shi, Kanagawa Within the Japan Atomic Energy Research Institute (72) Inventor Yuichi Tokaibayashi 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Within the Japan Atomic Energy Research Institute (56) References JP-A-3-73896 (JP, A) JP-A-3-73897 (JP, A)
Claims (1)
陽極カドミウム中に溶解させ、前記カドミウム中に溶解
した燃料成分を電気分解により電解質塩化物中に配置さ
れた固体陰極の表面に析出させて回収する溶融塩電解精
製装置において、 前記陽極カドミウムを電解槽内における前記固体陰極よ
りも下側に設けるとともに、前記陽極カドミウムに対面
する前記固体陰極の下部面を覆うように、固体陰極より
径の大きい円板状の絶縁板を設けたことを特徴とする溶
融塩電解精製装置。1. Spent metal fuel of a fast breeder reactor is dissolved in anode cadmium in an electrolytic cell, and a fuel component dissolved in the cadmium is electrolyzed to a surface of a solid cathode disposed in an electrolyte chloride. In a molten salt electrorefining apparatus that precipitates and recovers, the anode cadmium is provided below the solid cathode in an electrolytic cell, and the solid cathode covers the lower surface of the solid cathode facing the anode cadmium. An electrolytic refining apparatus for molten salt, comprising a disk-shaped insulating plate having a larger diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20966989A JP2809733B2 (en) | 1989-08-15 | 1989-08-15 | Molten salt electrorefining equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20966989A JP2809733B2 (en) | 1989-08-15 | 1989-08-15 | Molten salt electrorefining equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0373894A JPH0373894A (en) | 1991-03-28 |
| JP2809733B2 true JP2809733B2 (en) | 1998-10-15 |
Family
ID=16576644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20966989A Expired - Lifetime JP2809733B2 (en) | 1989-08-15 | 1989-08-15 | Molten salt electrorefining equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2809733B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100880421B1 (en) * | 2007-06-05 | 2009-01-29 | 한국원자력연구원 | Solid-liquid integrated cathode and method of the recovering of actinide elements using the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6455396A (en) * | 1987-08-27 | 1989-03-02 | Nippon Mining Co | Electrodeposition method for metal |
| US4814046A (en) * | 1988-07-12 | 1989-03-21 | The United States Of America As Represented By The United States Department Of Energy | Process to separate transuranic elements from nuclear waste |
-
1989
- 1989-08-15 JP JP20966989A patent/JP2809733B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0373894A (en) | 1991-03-28 |
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