JPH0791597B2 - Palladium extraction separation method - Google Patents
Palladium extraction separation methodInfo
- Publication number
- JPH0791597B2 JPH0791597B2 JP62120898A JP12089887A JPH0791597B2 JP H0791597 B2 JPH0791597 B2 JP H0791597B2 JP 62120898 A JP62120898 A JP 62120898A JP 12089887 A JP12089887 A JP 12089887A JP H0791597 B2 JPH0791597 B2 JP H0791597B2
- Authority
- JP
- Japan
- Prior art keywords
- palladium
- rhodium
- platinum
- organic solvent
- extracted
- 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
Landscapes
- Extraction Or Liquid Replacement (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、白金及び／又はロジウムとパラジウムを含む
混合溶液からパラジウムを抽出により分離する方法に関
する。TECHNICAL FIELD The present invention relates to a method for separating palladium from a mixed solution containing platinum and / or rhodium and palladium by extraction.
（従来技術とその問題点） チオエーテルの一種であるジヘキシルスルフィド（DH
S）を使用して、白金、ロジウム及びパラジウム等を含
む塩酸酸性水溶液からパラジウムを選択的に分離する方
法が知られている（特開昭60−86220号）。しかし、該
抽出により有機相に抽出されるパラジウムには若干量の
白金やロジウムが混入し、より純粋なパラジウムを得る
ために該有機相をアンモニア水で逆抽出して前記白金や
ロジウムをパラジウムと共に移動させ、従来一般の方法
で除去するようにしている。(Prior art and its problems) Dihexyl sulfide (DH) which is a kind of thioether
There is known a method of selectively separating palladium from an acidic aqueous hydrochloric acid solution containing platinum, rhodium, palladium and the like using S) (JP-A-60-86220). However, a small amount of platinum or rhodium is mixed in the palladium extracted in the organic phase by the extraction, and in order to obtain purer palladium, the organic phase is back-extracted with aqueous ammonia and the platinum or rhodium is mixed with palladium. It is moved and removed by a conventional method.
（発明の目的） 本発明は、白金及び／又はロジウムとパラジウムを含む
混合溶液からパラジウムを抽出する際に刺激性物質や高
価な薬剤を使用することなく効率良くパラジウムを白金
及び／又はロジウムから抽出分離するための方法を提供
することを目的とする。(Object of the Invention) The present invention efficiently extracts palladium from platinum and / or rhodium without using a stimulant or an expensive agent when extracting palladium from a mixed solution containing platinum and / or rhodium and palladium. It is intended to provide a method for separating.
（問題点を解決するための手段） 本発明は、パラジウム及び白金及び／又はロジウムを含
む塩酸酸性溶液からジヘキシルスルフィドを使用してパ
ラジウムを抽出分離する方法において、前記溶液をジヘ
キシルスルフィドを含む有機溶媒と接触させて該有機溶
媒中にパラジウム及び少量の白金及び／又はロジウムを
移行させ、次いで該有機溶媒を水により逆抽出して、前
記有機溶媒中にパラジウムを残したまま前記白金及び／
又はロジウムを水中へ移行させることを特徴とする方法
である。(Means for Solving Problems) The present invention relates to a method of extracting and separating palladium from a hydrochloric acid acidic solution containing palladium and platinum and / or rhodium using dihexyl sulfide, wherein the solution is an organic solvent containing dihexyl sulfide. Palladium and a small amount of platinum and / or rhodium are transferred into the organic solvent by contacting with the organic solvent, and then the organic solvent is back-extracted with water to remove the platinum and / or platinum while leaving palladium in the organic solvent.
Alternatively, the method is characterized in that rhodium is transferred into water.
以下本発明をより詳細に説明する。The present invention will be described in more detail below.
本発明は、ジヘキシルスルフィドを含む有機溶媒で抽出
した少量の白金及び／又はロジウムを含むパラジウム中
の前記白金及び／又はロジウムを水で逆抽出して有機溶
媒中から除去し、純粋なパラジウムを有機溶媒中に残す
ことを最大の特徴とし、本発明は、従来技術において盲
点となっていた最も単純な抽出試薬である水の使用によ
る白金及び／又はロジウムの選択的な逆抽出を見出した
ことにより案出されたものである。In the present invention, the platinum and / or rhodium in the palladium containing a small amount of platinum and / or rhodium extracted with an organic solvent containing dihexyl sulfide are back-extracted with water to remove them from the organic solvent, and pure palladium is added to the organic solvent. With the greatest feature of being left in a solvent, the present invention has found that selective back-extraction of platinum and / or rhodium by using water, which is the simplest extraction reagent in the prior art, is a blind spot. It was devised.
本発明における抽出機構は次のように推定することがで
きる。The extraction mechanism in the present invention can be estimated as follows.
第１段階であるジヘキシルスルフィドを含む有機溶媒に
パラジウムが抽出され白金及びロジウムが殆ど抽出され
ないのは、パラジウムが下式のよ うにジヘキシルスルフィドの硫黄のローンペアに水素を
介して配位結合しているため、ジヘキシルスルフィドと
の親和力が大きく、有機相中で安定しているためであ
る。一方白金及びロジウムは配位結合ではなく溶媒和に
よる安定化を受けているため、溶媒としての極性がジヘ
キシルスルフィドより大きい水との親和力が大きく有機
溶媒による抽出を受け難く、又有機溶媒中に存在する原
子は水による逆抽出により容易に抽出されるものと考え
ることができる。Palladium is extracted in the organic solvent containing dihexyl sulfide in the first step, and platinum and rhodium are hardly extracted. This is because the coordinative bond between hydrogen and the sulfur loan pair of dihexyl sulfide has a large affinity with dihexyl sulfide and is stable in the organic phase. On the other hand, platinum and rhodium are stabilized by solvation, not by coordination bonds, so they have a greater affinity for water, which has a larger polarity as a solvent than dihexyl sulfide, and are difficult to extract with organic solvents, and also exist in organic solvents. It can be considered that the atom to be extracted is easily extracted by back extraction with water.
本発明の抽出の有機相としてジヘキシルスルフィドを単
独で使用してもよいが、好ましくはシクロヘキサン等の
無極性溶媒を希釈剤として使用する。Dihexyl sulfide may be used alone as the organic phase of the extraction of the present invention, but preferably a non-polar solvent such as cyclohexane is used as the diluent.
なおジヘキシルスルフィドを使用してバラジウムを前記
塩酸酸性溶液から抽出する際にナトリウムイオンが存在
すると、パラジウムの分配比が減少して抽出効率が低下
する。If sodium ions are present when the palladium is extracted from the acidic hydrochloric acid solution using dihexyl sulfide, the distribution ratio of palladium is reduced and the extraction efficiency is reduced.
又水による白金及び／又はロジウムの逆抽出の際に0.01
モル/lのチオシアン酸ナトリウムを存在させると逆抽出
効率が上昇するが、該チオシアン酸ナトリウムの濃度を
0.5モル/lとするとパラジウムも逆抽出されて沈澱を生
じてしまう。In addition, when back-extracting platinum and / or rhodium with water, 0.01
The presence of mol / l sodium thiocyanate increases the back extraction efficiency, but the concentration of sodium thiocyanate
When it is 0.5 mol / l, palladium is also back-extracted and precipitates.
以下本発明の実施例を記載するが、該実施例は本発明を
限定するものではない。Examples of the present invention will be described below, but the examples do not limit the present invention.
（実施例１） ３モル/lの塩酸中に塩化白金酸と塩化パラジウムの粉末
を溶解して、白金とパラジウムの濃度がそれぞれ20g/l
及び1g/lとなるようにした。該塩酸酸性溶液１に、10
容量％のジヘキシルスルフィドを含むシクロヘキサン0.
4lを加え、分液漏斗中で30分間振盪させた。原子吸光分
析法を使用して有機相／水相の分配比を測定したとこ
ろ、パラジウムについて102、白金について10-2であ
り、パラジウムの抽出率は95％以上、白金の抽出率は１
％程度であった。(Example 1) Powders of chloroplatinic acid and palladium chloride were dissolved in 3 mol / l hydrochloric acid so that the concentrations of platinum and palladium were each 20 g / l.
And 1 g / l. To the hydrochloric acid acidic solution 1, 10
Cyclohexane with volume% dihexyl sulfide 0.
4 l were added and shaken in a separatory funnel for 30 minutes. Was using atomic absorption spectrometry to measure the distribution ratio of the organic phase / aqueous phase, 10 2 for palladium, 10-2 for platinum extraction rate of palladium 95% or more, extraction rate of platinum 1
It was about%.
抽出後の該有機相0.4lを純水１と10分間振盪させる
と、該有機相中の白金の99％以上を水相中へ抽出するこ
とができ、前記有機相中のパラジウムは全て該有機相中
へ残った。When 0.4 l of the organic phase after extraction is shaken with pure water 1 for 10 minutes, 99% or more of platinum in the organic phase can be extracted into the aqueous phase, and palladium in the organic phase is entirely contained in the organic phase. Remained in phase.
（実施例２） ３モル/lの塩酸中に塩化ロジウム酸と塩化パラジウムの
粉末を溶解して、ロジウムとパラジウムの濃度がそれぞ
れ20g/l及び1g/lとなるようにした。該塩酸酸性溶液１
に、10容量％のジヘキシルスルフィドを含むシクロヘ
キサン0.4lを加え、分液漏斗中で30分間振盪させた。原
子吸光分析法を使用して有機相／水相の分配比を測定し
たところ，パラジウムについて102、ロジウムについて
1.7×10-2であり、パラジウムの抽出率は95％以上、ロ
ジウムの抽出率は１％程度であった。Example 2 Powders of rhodium chloride and palladium chloride were dissolved in 3 mol / l hydrochloric acid so that the concentrations of rhodium and palladium were 20 g / l and 1 g / l, respectively. The hydrochloric acid acidic solution 1
Was added to 0.4 l of cyclohexane containing 10% by volume of dihexyl sulfide, and the mixture was shaken in a separating funnel for 30 minutes. The distribution ratio of organic phase / aqueous phase was measured by atomic absorption spectrometry. It was 10 2 for palladium and rhodium.
It was 1.7 × 10 -2 , the extraction rate of palladium was 95% or more, and the extraction rate of rhodium was about 1%.
抽出後の該有機相0.4lを純水１と10分間振盪させる
と、該有機相中のロジウムの99.9％以上を水相中へ抽出
することができ、前記有機相中のパラジウムは全て該有
機相中へ残った。When 0.4 l of the organic phase after extraction is shaken with pure water 1 for 10 minutes, 99.9% or more of rhodium in the organic phase can be extracted into the aqueous phase, and palladium in the organic phase is entirely contained in the organic phase. Remained in phase.
（発明の効果） アンモニア水を使用する従来の逆抽出に対して本発明で
は水の使用のみで少量の白金及び／又はロジウムと比較
的大量のパラジウムを含むジヘキシルスルフィド抽出さ
れた有機溶媒中から前記白金及び／又はロジウムを選択
的に除去できる。従って、操作が大幅に簡略化するとと
もに経済的にも有利になる。(Effect of the invention) In contrast to the conventional back-extraction using aqueous ammonia, the present invention uses the above-mentioned organic solvent extracted from dihexyl sulfide containing a small amount of platinum and / or rhodium and a relatively large amount of palladium only by using water. Platinum and / or rhodium can be selectively removed. Therefore, the operation is greatly simplified and economically advantageous.
Claims (2)
含む塩酸酸性溶液からジヘキシルスルフィドを使用して
パラジウムを抽出分離する方法において、前記溶液をジ
ヘキシルスルフィドを含む有機溶媒と接触させて該有機
溶媒中にパラジウム及び少量の白金及び／又はロジウム
を移行させ、次いで該有機溶媒を水により逆抽出して、
前記有機溶媒中にパラジウムを残したまま前記白金及び
／又はロジウムを水中へ移行させることを特徴とするパ
ラジウムの抽出分離方法。1. A method for extracting and separating palladium from an acidic hydrochloric acid solution containing palladium and platinum and / or rhodium using dihexyl sulfide, wherein the solution is brought into contact with an organic solvent containing dihexyl sulfide, and the solution is added to the organic solvent. Palladium and small amounts of platinum and / or rhodium are transferred, then the organic solvent is back-extracted with water,
A method for extracting and separating palladium, which comprises migrating the platinum and / or rhodium into water while leaving palladium in the organic solvent.
用する特許請求の範囲第１項に記載のパラジウムの抽出
分離方法。2. The method for extracting and separating palladium according to claim 1, wherein cyclohexane is used as a diluent for the organic phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62120898A JPH0791597B2 (en) | 1987-05-18 | 1987-05-18 | Palladium extraction separation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62120898A JPH0791597B2 (en) | 1987-05-18 | 1987-05-18 | Palladium extraction separation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63286530A JPS63286530A (en) | 1988-11-24 |
| JPH0791597B2 true JPH0791597B2 (en) | 1995-10-04 |
Family
ID=14797726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62120898A Expired - Lifetime JPH0791597B2 (en) | 1987-05-18 | 1987-05-18 | Palladium extraction separation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0791597B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6086220A (en) * | 1983-05-31 | 1985-05-15 | Sumitomo Metal Mining Co Ltd | Method for separating palladium from aqueous hydrochloric acid solution |
-
1987
- 1987-05-18 JP JP62120898A patent/JPH0791597B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63286530A (en) | 1988-11-24 |
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