JPS59212800A - Method of recovering phosphoric acid - Google Patents
Method of recovering phosphoric acidInfo
- Publication number
- JPS59212800A JPS59212800A JP8799983A JP8799983A JPS59212800A JP S59212800 A JPS59212800 A JP S59212800A JP 8799983 A JP8799983 A JP 8799983A JP 8799983 A JP8799983 A JP 8799983A JP S59212800 A JPS59212800 A JP S59212800A
- Authority
- JP
- Japan
- Prior art keywords
- phosphoric acid
- electrolyte
- valve
- recovering phosphoric
- waste
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は電解液にリン酸を用いて，放射性金属廃棄物を
電解研磨法により除染する場合のリン酸の回収方法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering phosphoric acid when radioactive metal waste is decontaminated by electrolytic polishing using phosphoric acid as an electrolytic solution.
放射性金属廃棄物を、リン酸を電解液として電解研摩法
により除染した場合、Ｆｅ、Ｃｒ、Ｎｉ等の放射性金属
イオンが溶出し、長時間使用すると劣化してくる。この
劣化した電解液は，電流効率が低下するので更新等の処
置が必要である。When radioactive metal waste is decontaminated by an electrolytic polishing method using phosphoric acid as an electrolyte, radioactive metal ions such as Fe, Cr, and Ni are eluted and deteriorate when used for a long time. This deteriorated electrolyte solution requires replacement or other measures because the current efficiency decreases.
その際，電解液は放射性物質を含有しており、何らかの
処理が要求されるが、現時点では有効な処理方法がなく
、そのまま保管されている現状にある。At that time, the electrolyte contains radioactive materials and requires some kind of treatment, but there is currently no effective treatment method, so the electrolyte is currently stored as is.
本発明は上記の問題点に対処するもので、電解液（リン
酸）の寿命を長くしてリン酸の損失を少なくすると共に
二次廃棄物の発生を減少させることを目的とする。The present invention addresses the above-mentioned problems and aims to extend the life of the electrolyte (phosphoric acid) to reduce loss of phosphoric acid and to reduce the generation of secondary waste.
その特徴とするところは、リン酸を電解液として電解研
摩法により放射金属廃棄物を除染する方法において、上
記電解液を陰イオン交換樹脂と接触させて該樹脂にリン
酸を吸着させたのち水洗するリン酸の回収方法にあり、
リン酸の回収を計るために陰イオン交換樹脂を使用する
ので，再生は水で可能であり，これによって高値なリン
酸の回収は勿論二次廃莱物の発生量の減少を図ることが
でき，更に溶解金属（廃液）がリン酸と分離されるため
廃液の後処理が容易となる等の効果を奏する。The feature is that in the method of decontaminating radioactive metal waste by electrolytic polishing using phosphoric acid as an electrolytic solution, the electrolytic solution is brought into contact with an anion exchange resin and phosphoric acid is adsorbed on the resin. There is a method for recovering phosphoric acid by washing with water.
Since an anion exchange resin is used to recover phosphoric acid, regeneration is possible with water, which not only allows recovery of expensive phosphoric acid but also reduces the amount of secondary waste generated. Furthermore, since the dissolved metal (waste liquid) is separated from the phosphoric acid, post-treatment of the waste liquid becomes easy.
以下本発明の最も好ましい実施例を図面により詳細に説
明する。The most preferred embodiments of the present invention will be described in detail below with reference to the drawings.
１は放射性金属廃棄物を電解研摩する電解液槽でＦｅ、
Ｎｉ、Ｃｒ等の溶解金属を含む劣化リン酸はポンプ５に
より抜き出されフィルター８を経た後バルブ１０を閉じ
バルブ９を開にした状態で陰イオン交換樹脂塔４へ送ら
れる。そこでまずリン酸が非解離の状態で樹脂に選択的
に吸着され、流出液中には 金属イオンが含まれる。そ
してこの流出液はバルブ１１を閉じバルブ１２を開にし
た状態で廃液タンク３にためられる。次に水夕ンク２の
水をポンプ６でバルブ９を閉じバルブ１０を開にして樹
脂塔４へ送入すると、リン酸が脱着されバルブ１１を通
って再び電解液槽１へ返される。このリン酸濃度が低低
下した場合は配給ライン７よりリン酸を補給する。1 is an electrolytic solution tank for electrolytically polishing radioactive metal waste.
Degraded phosphoric acid containing dissolved metals such as Ni and Cr is extracted by a pump 5, passes through a filter 8, and is sent to an anion exchange resin tower 4 with a valve 10 closed and a valve 9 open. First, phosphoric acid is selectively adsorbed to the resin in an undissociated state, and the effluent contains metal ions. This effluent is collected in the waste liquid tank 3 with the valve 11 closed and the valve 12 opened. Next, when the water in the water tank 2 is fed into the resin column 4 by the pump 6 with the valve 9 closed and the valve 10 opened, the phosphoric acid is desorbed and returned to the electrolyte tank 1 through the valve 11. When the phosphoric acid concentration decreases, phosphoric acid is replenished from the distribution line 7.
廃液タンク３に貯められた廃液は蒸発濃縮、凝集沈殿の
処理を行う。The waste liquid stored in the waste liquid tank 3 is subjected to evaporation concentration and coagulation and precipitation.
上記の方法によりリン酸の回収率及び溶解金属の除去率
を実験より求めた結果は表１の通り回収率、除去率とも
良好であった。The recovery rate of phosphoric acid and the removal rate of dissolved metals were experimentally determined by the above method, and as shown in Table 1, both the recovery rate and the removal rate were good.
図面は本発明の−実施例を示すフローチャートである １…電解液槽，４…陰イオン交換樹脂塔。 The drawing is a flowchart illustrating an embodiment of the invention. 1... Electrolyte tank, 4... Anion exchange resin tower.
Claims (1)
物を除染する方法において，上記電解液をイオン交換樹
脂と接触させて該樹脂にリン酸を吸着させたのち水洗す
ることを特徴とするリン酸の回収方法。A method for decontaminating radioactive metal waste by electrolytic polishing using phosphoric acid as an electrolyte, which comprises bringing the electrolyte into contact with an ion exchange resin to adsorb phosphoric acid on the resin, and then washing with water. Acid recovery method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8799983A JPS59212800A (en) | 1983-05-19 | 1983-05-19 | Method of recovering phosphoric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8799983A JPS59212800A (en) | 1983-05-19 | 1983-05-19 | Method of recovering phosphoric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59212800A true JPS59212800A (en) | 1984-12-01 |
Family
ID=13930481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8799983A Pending JPS59212800A (en) | 1983-05-19 | 1983-05-19 | Method of recovering phosphoric acid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59212800A (en) |
-
1983
- 1983-05-19 JP JP8799983A patent/JPS59212800A/en active Pending
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