JPH0446896B2 - - Google Patents
Info
- Publication number
- JPH0446896B2 JPH0446896B2 JP62033730A JP3373087A JPH0446896B2 JP H0446896 B2 JPH0446896 B2 JP H0446896B2 JP 62033730 A JP62033730 A JP 62033730A JP 3373087 A JP3373087 A JP 3373087A JP H0446896 B2 JPH0446896 B2 JP H0446896B2
- Authority
- JP
- Japan
- Prior art keywords
- thorium
- solution
- cation exchange
- hydroxide
- exchange solution
- 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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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はトリウムの分離方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for separating thorium.
詳しくは、陽イオン交換液よりトリウムを水酸
化トリウムとして分離する方法に関するものであ
る。 Specifically, the present invention relates to a method for separating thorium from a cation exchange solution as thorium hydroxide.
近年、各種金属の分離精製法として溶媒抽出法
が広く行なわれ、抽出溶媒として陽イオン交換液
が広く用いられている。陽イオン交換液の一種で
ある酸性リン酸エステルは希土類元素に対して高
い抽出能力を有しているためトリウム、希土類元
素等の分離、精製に対して優れた抽出溶媒として
知られている。
In recent years, solvent extraction methods have been widely used as a method for separating and purifying various metals, and cation exchange solutions are widely used as extraction solvents. Acidic phosphate ester, which is a type of cation exchange solution, has a high extraction ability for rare earth elements and is therefore known as an excellent extraction solvent for separating and purifying thorium, rare earth elements, and the like.
しかしながら、酸性有機リン酸エステルはトリ
ウムに対して高い抽出能力を有しているため、鉱
酸等により酸性リン酸エステルより逆抽する場合
には逆抽効率が低く、鉱酸を多量に必要とし、工
業上不利であつた。
However, since acidic organic phosphate esters have a high extraction ability for thorium, when back-extracting from acidic phosphate esters using mineral acids, the back-extraction efficiency is low and a large amount of mineral acid is required. , which was industrially disadvantageous.
本発明者らは従来技術のかかる問題点を解決す
べく鋭意検討した結果、本発明に到達したもので
ある。本発明の目的は、工業上有利なトリウムの
分離法を提供することであり、この目的は、トリ
ウムのイオンを含む陽イオン交換液からトリウム
を分離するに当り、該陽イオン交換液をアルカリ
金属水酸化物水溶液と混合させて、トリウムを水
酸化トリウムとして析出させることにより容易に
達成し得る。
The present inventors have arrived at the present invention as a result of intensive studies aimed at solving the problems of the prior art. The purpose of the present invention is to provide an industrially advantageous method for separating thorium, and this purpose is to separate thorium from a cation exchange solution containing thorium ions by using an alkali metal This can be easily achieved by precipitating thorium as thorium hydroxide by mixing it with an aqueous hydroxide solution.
以下、本発明を詳細に説明する。 The present invention will be explained in detail below.
本発明はトリウムを含有している陽イオン交換
液からトリウムを分離取得する場合に適用され
る。この場合陽イオン交換液としては、ジ（２−
エチルヘキシル）リン酸、ジオクチルリン酸、ジ
（オクチルフエニル）リン酸、等の酸性リン酸エ
ステルが使用される。これら陽イオン交換液は粘
度が高いので、通常有機溶媒により希釈し、
0.001〜３モル／、好ましくは0.05〜1.5モル／
程度の溶液として用いるのがよい。有機溶媒と
しては、ケロセンのような石油留分、ヘキサン、
オクタン、デカン等の脂肪族炭化水素、ジブチル
エーテル、ジイソプロピルエーテル等のエーテル
類、ベンゼン、トルエン等の芳香族炭化水素等が
挙げられる。これら陽イオン交換液中のトリウム
イオン濃度は特に限定されないが0.005〜２モ
ル／程度がよい。 The present invention is applied to the case where thorium is separated and obtained from a cation exchange solution containing thorium. In this case, the cation exchange solution is di(2-
Acidic phosphoric acid esters such as ethylhexyl) phosphoric acid, dioctyl phosphoric acid, di(octylphenyl) phosphoric acid, etc. are used. These cation exchange solutions have high viscosity, so they are usually diluted with an organic solvent.
0.001-3 mol/, preferably 0.05-1.5 mol/
It is best to use it as a solution. Organic solvents include petroleum distillates such as kerosene, hexane,
Examples include aliphatic hydrocarbons such as octane and decane, ethers such as dibutyl ether and diisopropyl ether, and aromatic hydrocarbons such as benzene and toluene. The thorium ion concentration in these cation exchange solutions is not particularly limited, but is preferably about 0.005 to 2 mol/.
本発明においてはトリウムイオンを含有した陽
イオン交換液をアルカリ金属水酸化物水溶液と混
合することにより、トリウムを水酸化トリウムと
して析出させる。 In the present invention, thorium is precipitated as thorium hydroxide by mixing a cation exchange solution containing thorium ions with an aqueous alkali metal hydroxide solution.
混合させるアルカリ金属水酸化物の量は該イオ
ン交換液と当量以上でよいが、あまり多いと交換
液がゲル化するため該イオン交換液の１〜２倍
（モル比）が好ましい。 The amount of alkali metal hydroxide to be mixed may be at least equivalent to the ion exchange solution, but if it is too large, the exchange solution will gel, so it is preferably 1 to 2 times (molar ratio) the amount of the ion exchange solution.
また、アルカリ金属水酸化物の濃度は特に限定
はないがあまり薄いと水相が多くなり、逆にあま
り濃いと水相が少量となるため、通常20〜40％が
好ましい。 The concentration of the alkali metal hydroxide is not particularly limited, but if it is too thin, the aqueous phase will increase, and if it is too thick, the aqueous phase will be small, so it is usually preferably 20 to 40%.
上記アルカリ金属水酸化物の水溶液と陽イオン
交換液との混合は混合時間が短かいと、トリウム
の水酸化トリウムとしての分離が不完全になるの
で３分以上、好ましくは20分以上行うのが良い。 When mixing the above aqueous solution of alkali metal hydroxide and the cation exchange solution, if the mixing time is too short, the separation of thorium as thorium hydroxide will be incomplete, so it is recommended to mix the solution for at least 3 minutes, preferably at least 20 minutes. good.
次いで、析出した水酸化トリウムを通常の方法
で分離する。例えば陽イオン交換液は前記した如
く通常ケロセン等の有機溶媒に溶解させて使用す
るので、析出した水酸化トリウムのスラリーを陽
イオン交換液から分離した後、該トリウム含有ス
ラリーを過操作等により水酸化トリウムを分離
することができる。 The precipitated thorium hydroxide is then separated by a conventional method. For example, as mentioned above, the cation exchange solution is usually used after being dissolved in an organic solvent such as kerosene, so after separating the precipitated slurry of thorium hydroxide from the cation exchange solution, the thorium-containing slurry is mixed with water by over-operation or the like. Thorium oxide can be separated.
また、水酸化トリウムスラリーを含む陽イオン
交換液を過操作等を行ない水酸化トリウムを分
離してもよい。 Alternatively, thorium hydroxide may be separated by subjecting the cation exchange solution containing the thorium hydroxide slurry to overoperation.
なお、水酸化トリウムの分離温度は、特に限定
はなく常温でさしつかえない。 Note that the separation temperature of thorium hydroxide is not particularly limited, and room temperature is sufficient.
本発明方法によるトリウム分離後の陽イオン交
換液はそのままもしくはアルカリ金属水酸化物の
洗浄を行つた後、トリウム、希土類元素、その他
の金属の抽出分離、精製に再使用することができ
る。 The cation exchange solution after thorium has been separated by the method of the present invention can be reused as it is or after being washed with an alkali metal hydroxide for the extraction, separation, and purification of thorium, rare earth elements, and other metals.
以上詳述した様に、本発明に従つてトリウムの
析出分離を行えば、陽イオン交換液より効率よく
トリウムを分離することができるので工業的に有
利である。 As detailed above, if thorium is separated by precipitation according to the present invention, it is industrially advantageous because thorium can be separated more efficiently than with a cation exchange solution.
以下、本発明を実施例により詳細に説明する。 Hereinafter, the present invention will be explained in detail with reference to Examples.
実施例
ジ（２−エチルヘキシル）リン酸2mol／ｌを
含むケロセン溶液200mlと、トリウムとして1.0重
量％を含む塩化トリウム溶液50mlを常温で５分間
混合し、トリウムをケロセン溶液側に抽出したの
ち水相と分離した。得られたケロセン溶液と40重
量％NaOH溶液41mlを常温で20分間混合し、水
酸化トリウムを析出させ、過を行つた。Example 200 ml of a kerosene solution containing 2 mol/l of di(2-ethylhexyl) phosphoric acid and 50 ml of a thorium chloride solution containing 1.0% by weight as thorium are mixed at room temperature for 5 minutes, thorium is extracted into the kerosene solution, and then the aqueous phase is extracted. separated. The obtained kerosene solution and 41 ml of 40% by weight NaOH solution were mixed at room temperature for 20 minutes to precipitate thorium hydroxide, followed by filtration.
その結果トリウムとして0.485ｇを含む水酸化
物を回収した。なお、ケロセン溶液中に残存した
トリウムは0.015ｇであつた。 As a result, hydroxide containing 0.485 g of thorium was recovered. Note that 0.015 g of thorium remained in the kerosene solution.
比較例
実施例と同一の条件でトリウムを抽出して得ら
れたケロセン溶液と38％硫酸溶液250mlとを、常
温で20分間混合し、トリウムの逆抽出を行つた。Comparative Example A kerosene solution obtained by extracting thorium under the same conditions as in the example and 250 ml of a 38% sulfuric acid solution were mixed at room temperature for 20 minutes to perform back extraction of thorium.
結果として、硫酸中にトリウムとして0.326ｇ
分離し、ケロセン溶液中に0.17ｇが残存した。 As a result, 0.326g of thorium in sulfuric acid
It separated, leaving 0.17 g in the kerosene solution.
本発明によるときは陽イオン交換液より効率よ
くトリウムを分離することができるので工業的に
有利である。
The present invention is industrially advantageous because it can separate thorium more efficiently than a cation exchange solution.
Claims (1)
陽イオン交換液からトリウムを分離するに当り、
該陽イオン交換液をアルカリ金属水酸化物水溶液
と混合させて、トリウムを水酸化トリウムとして
析出させることを特徴とするトリウムの分離方
法。1. When separating thorium from an acidic phosphate cation exchange solution containing thorium ions,
A method for separating thorium, which comprises mixing the cation exchange solution with an aqueous alkali metal hydroxide solution to precipitate thorium as thorium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3373087A JPS63201015A (en) | 1987-02-17 | 1987-02-17 | How to separate thorium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3373087A JPS63201015A (en) | 1987-02-17 | 1987-02-17 | How to separate thorium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63201015A JPS63201015A (en) | 1988-08-19 |
| JPH0446896B2 true JPH0446896B2 (en) | 1992-07-31 |
Family
ID=12394516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3373087A Granted JPS63201015A (en) | 1987-02-17 | 1987-02-17 | How to separate thorium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63201015A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8904433D0 (en) * | 1989-02-27 | 1989-04-12 | British Nuclear Fuels Plc | Removal of thorium from raffinate |
| FR2697010B1 (en) * | 1992-10-19 | 1995-02-24 | Rhone Poulenc Chimie | Process for the treatment of soluble thorium compounds and new thorium phosphate thus obtained. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4652431A (en) * | 1981-02-26 | 1987-03-24 | Prodeco, Inc. | Process for recovering uranium using an alkyl pyrophosphoric acid and alkaline stripping solution |
-
1987
- 1987-02-17 JP JP3373087A patent/JPS63201015A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63201015A (en) | 1988-08-19 |
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