JPH04254535A - Separation of platinum-group metal - Google Patents
Separation of platinum-group metalInfo
- Publication number
- JPH04254535A JPH04254535A JP3251891A JP3251891A JPH04254535A JP H04254535 A JPH04254535 A JP H04254535A JP 3251891 A JP3251891 A JP 3251891A JP 3251891 A JP3251891 A JP 3251891A JP H04254535 A JPH04254535 A JP H04254535A
- Authority
- JP
- Japan
- Prior art keywords
- iridium
- chemically modified
- chitosan
- platinum
- modified chitosan
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 37
- 239000002184 metal Substances 0.000 title claims abstract description 37
- 238000000926 separation method Methods 0.000 title description 6
- 229920001661 Chitosan Polymers 0.000 claims abstract description 43
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 39
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 34
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 claims abstract description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 17
- -1 platinum group metals Chemical class 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 4
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 150000002739 metals Chemical class 0.000 abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 42
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 20
- 239000000243 solution Substances 0.000 description 17
- 229910052697 platinum Inorganic materials 0.000 description 15
- 229910052703 rhodium Inorganic materials 0.000 description 15
- 239000010948 rhodium Substances 0.000 description 15
- 229910052763 palladium Inorganic materials 0.000 description 14
- 238000001914 filtration Methods 0.000 description 12
- 239000003638 chemical reducing agent Substances 0.000 description 7
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000010953 base metal Substances 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003929 acidic solution Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000003456 ion exchange resin Substances 0.000 description 2
- 229920003303 ion-exchange polymer Polymers 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- LTYRAPJYLUPLCI-UHFFFAOYSA-N glycolonitrile Chemical compound OCC#N LTYRAPJYLUPLCI-UHFFFAOYSA-N 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- MILUBEOXRNEUHS-UHFFFAOYSA-N iridium(3+) Chemical compound [Ir+3] MILUBEOXRNEUHS-UHFFFAOYSA-N 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011403 purification operation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、貴金属の回収技術に係
わり、白金族金属を含む溶液から、イリジウムを分離す
る方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to precious metal recovery technology, and relates to a method for separating iridium from a solution containing a platinum group metal.
【０００２】0002
【従来技術とその問題点】従来白金族金属の回収方法と
しては王水等の酸に分解して還元剤を加えて白金族金属
を選択的に還元し濾過分離する化学還元方法や溶媒抽出
法、イオン交換樹脂による方法等が主に用いられている
。[Prior art and its problems] Conventional methods for recovering platinum group metals include chemical reduction methods, in which the platinum group metals are decomposed into acids such as aqua regia, and a reducing agent is added to selectively reduce the platinum group metals, followed by filtration separation, and solvent extraction methods. , methods using ion exchange resins, etc. are mainly used.
【０００３】しかし、前記化学還元方法等の従来の方法
はイリジウムを他の白金族金属から分離することが不十
分で繰り返し操作して精製する必要がある。また、卑金
属が多量に含有し白金族金属が少ない場合には特に多く
の労力を要し、化学還元法では困難となる場合が多く、
溶媒抽出法等を併用する等極めて操作も複雑となり回収
精製に長時間を要することとなる。However, conventional methods such as the chemical reduction method described above are insufficient in separating iridium from other platinum group metals and require repeated purification operations. In addition, in cases where a large amount of base metals are contained and platinum group metals are small, a lot of labor is required, and chemical reduction methods are often difficult.
The operation is extremely complicated, such as using a solvent extraction method, etc., and it takes a long time for recovery and purification.
【０００４】0004
【発明の目的】本発明の目的は、化学修飾キトサンを用
いて工業的な金属の分離、回収、精製を行うところにあ
り、稀少金属のなかでも極めて高価な白金族金属を分離
回収する方法を提供するところにある。[Object of the invention] The purpose of the present invention is to perform industrial separation, recovery, and purification of metals using chemically modified chitosan, and to develop a method for separating and recovering platinum group metals, which are extremely expensive among rare metals. It's there to provide.
【０００５】[0005]
【問題点を解決するための手段】本発明は、白金族金属
を含む溶液からイリジウムを分離するに際して、該溶液
中のイリジウムを３価に還元し溶液の酸度を２．０〜３
．５Ｎに調製した後、イミノ２酢酸を官能基として含有
するキトサンを加えて混合してイリジウムを吸着させた
後、該イリジウムを吸着したキトサンを分離することを
特徴とする白金族金属の分離方法である。[Means for Solving the Problems] The present invention, when separating iridium from a solution containing a platinum group metal, reduces the iridium in the solution to trivalent to reduce the acidity of the solution to 2.0 to 3.
．． A method for separating platinum group metals, which comprises preparing the mixture to 5N, adding and mixing chitosan containing iminodiacetic acid as a functional group to adsorb iridium, and then separating the chitosan adsorbed with iridium. be.
【０００６】以下、本発明の詳細を説明する。第一に高
濃度の酸に不溶性であるイミノ２酢酸を官能基として含
有する化学修飾キトサンを使用するところにある。すな
わちキトサンの性質は硫酸に溶けることはないが酢酸に
は溶解し、硝酸および塩酸では０．０５Ｎ〜０．５Ｎの
濃度範囲であると溶解する特殊の性質があり、樹脂化し
たキトサン（アミノカルボン酸の官能基を含有させたも
の）は上記の酸には溶解しないという特徴があるが溶液
との接触効率は低下する点がある。[0006] The details of the present invention will be explained below. The first is the use of chemically modified chitosan containing iminodiacetic acid as a functional group, which is insoluble in high concentrations of acid. In other words, chitosan has the special property of not being soluble in sulfuric acid, but soluble in acetic acid, and soluble in nitric acid and hydrochloric acid in the concentration range of 0.05N to 0.5N. (containing an acid functional group) has the characteristic that it does not dissolve in the above-mentioned acids, but the contact efficiency with the solution decreases.
【０００７】本発明に用いる化学修飾キトサンは前記キ
トサンと樹脂化したキトサンの両方の特徴を適度に有す
るものでキトサンにイミノ２酢酸の官能基を有するもの
を用いているところにある。化学修飾キトサンはキトサ
ンとグリコニトリルを含む水溶液とをエタノール中で７
０〜９０℃の温度で約７０時間攪拌して得られた固形の
生成物を水洗した後、３０％水酸化ナトリウム溶液中で
６０〜８０℃の温度で約７０時間攪拌し、固形物を濾過
して１Ｎの硫酸と水で洗浄した後乾燥させたものである
。The chemically modified chitosan used in the present invention has moderate characteristics of both the above chitosan and resinized chitosan, and the chitosan has an iminodiacetic acid functional group. Chemically modified chitosan is produced by combining chitosan and an aqueous solution containing glyconitrile in ethanol.
The solid product obtained by stirring at a temperature of 0 to 90°C for about 70 hours was washed with water, and then stirred in a 30% sodium hydroxide solution at a temperature of 60 to 80°C for about 70 hours, and the solid product was filtered. The sample was washed with 1N sulfuric acid and water, and then dried.
【０００８】本発明の方法は、まず白金族金属を含有す
る酸性溶液中のイリジウムを３価に還元し溶液の酸度を
２．０〜３．５Ｎに調製して前記化学修飾キトサンを白
金族金属の含有量の２０〜５０重量倍量を加え混合攪拌
してイリジウムを選択的に吸着させる。次いでイリジウ
ムを吸着した化学修飾キトサンを濾過分離し、分離した
化学修飾キトサンは０．０５〜０．５Ｎの塩酸を混合攪
拌して溶解し、イリジウムを還元するためのＳＢＨ等の
還元剤を加えてイリジウムの金属粉末として回収するか
、またはイリジウムを吸着した化学修飾キトサンを焼却
して水素還元して金属イリジウムとすることができるも
のである。In the method of the present invention, first, iridium in an acidic solution containing a platinum group metal is reduced to trivalent, and the acidity of the solution is adjusted to 2.0 to 3.5N, and the chemically modified chitosan is converted into a platinum group metal. 20 to 50 times the amount by weight of the content is added and mixed and stirred to selectively adsorb iridium. Next, the chemically modified chitosan adsorbed with iridium is separated by filtration, and the separated chemically modified chitosan is dissolved by mixing and stirring 0.05 to 0.5 N hydrochloric acid, and a reducing agent such as SBH for reducing iridium is added. Iridium can be recovered as metal powder, or chemically modified chitosan adsorbed with iridium can be incinerated and reduced with hydrogen to produce metal iridium.
【０００９】また、他の方法としては、白金族金属を含
有する酸性溶液中のイリジウムを３価に還元し溶液の酸
度を０．５〜１．５Ｎに調製して前記化学修飾キトサン
を白金族金属の含有量の２０〜５０重量倍量を加え混合
攪拌して白金族金属を吸着させる。次いで白金族金属を
吸着した化学修飾キトサンを濾過分離し、分離した化学
修飾キトサンは塩酸の酸度を３〜４Ｎの溶液として化学
修飾キトサンと混合攪拌してパラジウムや白金およびロ
ジウムを溶離し、濾過分離した化学修飾キトサンにはイ
リジウムが吸着した状態で止めることができる。上記の
方法によれば、イリジウムを含む白金族金属を含有する
溶液のイリジウムと他の白金族金属との分離が容易に行
うことができる。In addition, as another method, iridium in an acidic solution containing a platinum group metal is reduced to trivalent, and the acidity of the solution is adjusted to 0.5 to 1.5N, and the chemically modified chitosan is converted into a platinum group metal. Add 20 to 50 times the weight of the metal and mix and stir to adsorb the platinum group metal. Next, the chemically modified chitosan adsorbed with platinum group metals is separated by filtration, and the separated chemically modified chitosan is mixed with the chemically modified chitosan in a solution of hydrochloric acid with an acidity of 3 to 4N and stirred to elute palladium, platinum, and rhodium, and then separated by filtration. Chemically modified chitosan can be stopped in a state where iridium is adsorbed. According to the above method, it is possible to easily separate iridium from other platinum group metals in a solution containing a platinum group metal containing iridium.
【００１０】他の方法として、白金族金属を含有する酸
性溶液を０．０５〜０．４Ｎに調製し、化学修飾キトサ
ンを白金族金属の含有量の吸着に必要とする量を加え、
攪拌混合しながら塩酸を加えて酸度を０．５〜１Ｎに上
げると化学修飾キトサンは沈澱し白金族金属を吸着させ
ることができ、濾過分離したのち、１．５〜４Ｎ塩酸で
パラジウムや白金及びロジウムを溶離させ、イリジウム
と分離することもできる。化学修飾キトサンに吸着した
イリジウムを回収するには、０．０５〜０．５Ｎの塩酸
または硝酸溶液には化学修飾キトサンは溶解するので、
還元剤や塩化アンモニウムを加えて沈澱させてもよく、
他に化学修飾キトサンを焼却して回収することもできる
ものである。Another method is to prepare an acidic solution containing a platinum group metal to a concentration of 0.05 to 0.4N, add chemically modified chitosan in an amount necessary for adsorption of the platinum group metal content, and
When hydrochloric acid is added while stirring and mixing to raise the acidity to 0.5-1N, the chemically modified chitosan precipitates and can adsorb platinum group metals. After separation by filtration, palladium, platinum and Rhodium can also be eluted and separated from iridium. In order to recover iridium adsorbed on chemically modified chitosan, chemically modified chitosan is dissolved in a 0.05-0.5N hydrochloric acid or nitric acid solution, so
Precipitation may be performed by adding a reducing agent or ammonium chloride.
Alternatively, chemically modified chitosan can also be recovered by incineration.
【００１１】以上のような方法を行うことができるのは
、本発明に用いている化学修飾キトサンの性質が塩酸ま
たは硝酸には０．０５〜０．５Ｎの酸度では溶解し、１
Ｎ以上では溶解せずに安定しているという特徴があるか
らである。また、イリジウムに対しては他の白金族金属
と異なる特徴があり、最も吸着し易い酸度が２．５Ｎを
ピークとして２〜３．５Ｎで１００％の吸着をするとい
う特徴があるので、他の白金族金属との分離を可能にで
きるのである。The above method can be carried out because the chemically modified chitosan used in the present invention is soluble in hydrochloric acid or nitric acid at an acidity of 0.05 to 0.5N;
This is because it has the characteristic that it does not dissolve and remains stable above N. In addition, iridium has a different characteristic from other platinum group metals; the acidity at which it is most easily adsorbed peaks at 2.5N, and it adsorbs 100% at 2 to 3.5N. This makes it possible to separate it from platinum group metals.
【００１２】なお、パラジウムは０．５Ｎの酸度で最大
吸着を示し、酸度が上昇するにつれて吸着率が低下し、
白金は１Ｎの酸度で最大吸着を示し、酸度が上昇するに
つれて吸着率が低下する。ロジウムも白金とほぼ同様の
吸着状態である。以下、本発明に係わる実施例を記載す
るが、該実施例は本発明を限定するものではない。[0012] Palladium shows maximum adsorption at an acidity of 0.5N, and as the acidity increases, the adsorption rate decreases.
Platinum exhibits maximum adsorption at an acidity of 1N, and the adsorption rate decreases as the acidity increases. Rhodium is also adsorbed in almost the same state as platinum. Examples related to the present invention will be described below, but the examples are not intended to limit the present invention.
【００１３】[0013]
【実施例１】塩酸濃度１〜４ｍｏｌ／Ｌに変化させ、化
学修飾キトサンに対する、イリジウム（ＩＩＩ） との
分配比を求めた結果について図１に示す。塩酸濃度が２
〜３．５ｍｏｌ／Ｌで高い吸着率をしめしている。[Example 1] Figure 1 shows the results of determining the distribution ratio of iridium (III) to chemically modified chitosan by varying the hydrochloric acid concentration from 1 to 4 mol/L. Hydrochloric acid concentration is 2
It shows a high adsorption rate of ~3.5 mol/L.
【００１４】[0014]
【実施例２】Ｐｔ、Ｐｄ、Ｒｈ、Ｉｒをそれぞれ１００
ｍｇ／ｌ含有するＣｕ、Ｚｎ等の卑金属を２０ｇ／ｌ含
有する塩酸溶液にヒドラジンを加えてイリジウムを３価
に還元し次いで塩酸を加えて３Ｎ塩酸溶液１ｌに化学修
飾したキトサン３ｇを加えて攪拌し６０分間保持したの
ち、濾過分離して、濾過液中のＰｔ、Ｐｄ、Ｒｈおよび
Ｉｒを分析したところ、Ｐｔ、Ｐｄ、Ｒｈはそれぞれ９
８ｍｇ／ｌで、Ｉｒは１ｍｇ／ｌ以下であった。前記濾
過分離した化学修飾キトサンを０．１Ｎ塩酸１００ｍｌ
に入れ攪拌して６０分間保持し、ＳＢＨを還元剤として
加えてイリジウムを金属粉末に還元し、濾過分離したと
ころ金属粉末は１００ｍｇであった。なお、濾過液中の
Ｉｒは１ｍｇ／ｌ以下であった。[Example 2] 100 each of Pt, Pd, Rh, and Ir
Add hydrazine to a hydrochloric acid solution containing 20 g/l of base metals such as Cu and Zn containing mg/l to reduce iridium to trivalent, then add hydrochloric acid, add 3 g of chemically modified chitosan to 1 liter of 3N hydrochloric acid solution, and stir. After holding for 60 minutes, the filtrate was separated by filtration, and the filtrate was analyzed for Pt, Pd, Rh, and Ir.
8 mg/l, and Ir was less than 1 mg/l. 100 ml of 0.1N hydrochloric acid was added to the chemically modified chitosan separated by filtration.
The mixture was stirred and held for 60 minutes, and SBH was added as a reducing agent to reduce the iridium to metal powder, which was separated by filtration, and the amount of metal powder was 100 mg. Note that Ir in the filtrate was 1 mg/l or less.
【００１５】[0015]
【実施例３】Ｐｔ、Ｐｄ、Ｒｈ、Ｉｒをそれぞれ１００
ｍｇ／ｌ含有するＣｕ、Ｚｎ等の卑金属を２０ｇ／ｌ含
有する０．１Ｎ塩酸溶液１ｌに化学修飾したキトサン３
ｇを加えて攪拌し、塩酸を加えて酸度を１．０Ｎに上げ
６０分間保持したのち、濾過分離して、濾過液中のＰｔ
、Ｐｄ、Ｒｈ、Ｉｒを分析したところ、それぞれ１ｍｇ
／ｌ以下であった。前記濾過分離した化学修飾キトサン
を４Ｎ塩酸２００ｍｌに入れ攪拌して６０分間保持し、
濾過分離し、次いで、４Ｎ塩酸で処理した化学修飾キト
サンに水を加えて０．１Ｎ塩酸として、ＳＢＨを加えて
還元させたところ金属粉末が沈澱したので、これを、濾
過分離して、濾過液中のＰｔ、Ｐｄ、Ｒｈ、Ｉｒを分析
したところＰｔ、Ｐｄ、Ｒｈは検出されたが、Ｉｒは検
出されなかった。なお、前記金属粉末を分析したところ
、Ｉｒが主で白金とロジウムが微量含まれていた。[Example 3] 100 each of Pt, Pd, Rh, and Ir
Chitosan 3 chemically modified in 1 liter of 0.1N hydrochloric acid solution containing 20 g/l of base metals such as Cu and Zn containing mg/l
After adding hydrochloric acid to raise the acidity to 1.0N and holding it for 60 minutes, the Pt in the filtrate was separated by filtration.
, Pd, Rh, and Ir were analyzed and found to be 1 mg each.
/l or less. The chemically modified chitosan separated by filtration was placed in 200 ml of 4N hydrochloric acid, stirred and held for 60 minutes,
After separation by filtration, water was added to chemically modified chitosan treated with 4N hydrochloric acid to make 0.1N hydrochloric acid, and SBH was added to reduce the metal powder, which was separated by filtration to obtain a filtrate. When Pt, Pd, Rh, and Ir were analyzed, Pt, Pd, and Rh were detected, but Ir was not detected. When the metal powder was analyzed, it was found that Ir was the main component and trace amounts of platinum and rhodium were contained.
【００１６】[0016]
【実施例４】化学修飾キトサンをガラスカラムに充填し
、Ｐｔ、Ｐｄ、Ｒｈ、Ｉｒをそれぞれ１００ｍｌ／ｌ含
有するＣｕ、Ｚｎ等の卑金属を２０ｇ／ｌ含有する０．
８Ｎ塩酸溶液１ｌを空間速度ＳＶ＝０．２で通液させた
ところ、通液したのちの液中にはＰｔ、Ｐｄ、Ｒｈ、Ｉ
ｒはそれぞれ１ｍｌ／ｌ以下であった。次いで、化学修
飾キトサン層を３．５Ｎ塩酸２００ｍｌをＳＶ＝０．２
で通液して洗浄したのち、さらに、４Ｎ塩酸２００ｍｌ
をＳＶ＝０．２で通液してＰｄ、Ｐｔ、Ｒｈを溶離し、
該化学修飾キトサンをガラスカラムより取り出し、７５
０℃で灰化して、水素炎で還元したところ９５ｍｇのＩ
ｒ金属粉末が得られた。[Example 4] Chemically modified chitosan was packed into a glass column, and 0.00000000.
When 1 liter of 8N hydrochloric acid solution was passed through the solution at a space velocity SV=0.2, Pt, Pd, Rh, and I
r was 1 ml/l or less, respectively. Next, the chemically modified chitosan layer was treated with 200ml of 3.5N hydrochloric acid at SV=0.2.
After washing with water, add 200ml of 4N hydrochloric acid.
was passed at SV=0.2 to elute Pd, Pt, and Rh,
The chemically modified chitosan was taken out from the glass column and 75
When incinerated at 0℃ and reduced with hydrogen flame, 95 mg of I
r metal powder was obtained.
【００１７】[0017]
【発明の効果】従来キトサンを工業的に利用することは
難しかったが、本発明は工業的に貴重なパラジウムや白
金、ロジウム、イリジウムの回収を可能とした。また溶
離回収や分離回収など工業的により有利な技術を提供す
ることは、産業の発展の上で本発明の効果大なるもので
ある。また従来、パラジウムや白金、ロジウム、イリジ
ウムの回収において、希薄溶液や、ベースメタルの多い
ものは種々の工程を経る必要があったが、本発明はパラ
ジウム、白金、ロジウム、イリジウムが濃縮され、また
ベースメタルと分離されて得られる利点などもある。ま
た化学修飾キトサンを用いているため極めて焼却が容易
であり他のイオン交換樹脂とは比較した場合には全く別
の効果もある。[Effects of the Invention] Conventionally, it was difficult to utilize chitosan industrially, but the present invention has made it possible to recover industrially valuable palladium, platinum, rhodium, and iridium. Furthermore, the present invention has a great effect on the development of industry by providing industrially more advantageous techniques such as elution recovery and separation recovery. Furthermore, in the past, in the recovery of palladium, platinum, rhodium, and iridium, dilute solutions and those containing many base metals had to go through various processes, but the present invention allows palladium, platinum, rhodium, and iridium to be concentrated and There are also benefits that can be obtained by being separated from the base metal. Furthermore, since chemically modified chitosan is used, it is extremely easy to incinerate, and has completely different effects when compared to other ion exchange resins.
【図１】化学修飾キトサンにおけるイリジウムの吸着の
分配比について塩酸濃度との関係を表したものである。FIG. 1 shows the relationship between the distribution ratio of adsorption of iridium in chemically modified chitosan and the concentration of hydrochloric acid.
Claims (1)
を分離するに際して、該溶液中のイリジウムを３価に還
元し溶液の酸度を２．０〜３．５Ｎに調製した後、イミ
ノ２酢酸を官能基として含有するキトサンを加えて混合
してイリジウムを吸着させた後、該イリジウムを吸着し
たキトサンを分離することを特徴とする白金族金属の分
離方法。Claim 1: When separating iridium from a solution containing a platinum group metal, the iridium in the solution is reduced to trivalent, the acidity of the solution is adjusted to 2.0 to 3.5N, and then iminodiacetic acid is functionalized. 1. A method for separating platinum group metals, which comprises adding and mixing chitosan contained as a group to adsorb iridium, and then separating the chitosan that has adsorbed iridium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3251891A JP2941073B2 (en) | 1991-02-01 | 1991-02-01 | Method for separating platinum group metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3251891A JP2941073B2 (en) | 1991-02-01 | 1991-02-01 | Method for separating platinum group metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04254535A true JPH04254535A (en) | 1992-09-09 |
| JP2941073B2 JP2941073B2 (en) | 1999-08-25 |
Family
ID=12361189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3251891A Expired - Lifetime JP2941073B2 (en) | 1991-02-01 | 1991-02-01 | Method for separating platinum group metals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2941073B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0756013A1 (en) * | 1995-07-25 | 1997-01-29 | Matthey Rustenburg Refiners (Proprietary) Limited | Interseparation of platinum group metals |
| JP2012167334A (en) * | 2011-02-15 | 2012-09-06 | Jx Nippon Mining & Metals Corp | METHOD OF RECOVERING Ir FROM PLATINUM GROUP-CONTAINING SOLUTION |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553537B (en) * | 2011-12-26 | 2013-10-30 | 沈阳化工大学 | Chitosan base expanded bed adsorption medium with double function ligands and preparation method thereof |
-
1991
- 1991-02-01 JP JP3251891A patent/JP2941073B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0756013A1 (en) * | 1995-07-25 | 1997-01-29 | Matthey Rustenburg Refiners (Proprietary) Limited | Interseparation of platinum group metals |
| EP0906962A1 (en) * | 1995-07-25 | 1999-04-07 | Matthey Rustenburg Refiners (Proprietary) Limited | Interseparation of platinum group metals |
| JP2012167334A (en) * | 2011-02-15 | 2012-09-06 | Jx Nippon Mining & Metals Corp | METHOD OF RECOVERING Ir FROM PLATINUM GROUP-CONTAINING SOLUTION |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2941073B2 (en) | 1999-08-25 |
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