JPH04141533A - Method for recovering noble metal - Google Patents
Method for recovering noble metalInfo
- Publication number
- JPH04141533A JPH04141533A JP26022290A JP26022290A JPH04141533A JP H04141533 A JPH04141533 A JP H04141533A JP 26022290 A JP26022290 A JP 26022290A JP 26022290 A JP26022290 A JP 26022290A JP H04141533 A JPH04141533 A JP H04141533A
- Authority
- JP
- Japan
- Prior art keywords
- platinum group
- chemically modified
- hydrochloric acid
- chitosan
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 26
- 229910000510 noble metal Inorganic materials 0.000 title claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229920001661 Chitosan Polymers 0.000 claims abstract description 44
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims abstract description 9
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 125000000524 functional group Chemical group 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 239000010970 precious metal Substances 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 abstract description 25
- 229910052697 platinum Inorganic materials 0.000 abstract description 22
- -1 platinum group metals Chemical class 0.000 abstract description 20
- 229910052703 rhodium Inorganic materials 0.000 abstract description 18
- 238000001914 filtration Methods 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 36
- 239000010948 rhodium Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 12
- 239000010953 base metal Substances 0.000 description 11
- 239000000706 filtrate Substances 0.000 description 10
- 239000003638 chemical reducing agent Substances 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003456 ion exchange resin Substances 0.000 description 2
- 229920003303 ion-exchange polymer Polymers 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 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
- 238000000605 extraction Methods 0.000 description 1
- LTYRAPJYLUPLCI-UHFFFAOYSA-N glycolonitrile Chemical compound OCC#N LTYRAPJYLUPLCI-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002941 palladium compounds Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
（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、白金族金属を回収する方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to noble metal recovery technology, and relates to a method for recovering platinum group metals from a solution containing platinum group metals.
（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 they 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.
しかし、前記化学還元方法等の従来の方法は卑金属が多
量に含有するものについては卑金属との分離が不十分で
繰り返し操作して精製する必要がある。However, conventional methods such as the chemical reduction method are insufficient in separating base metals from substances containing a large amount of base metals, and it is necessary to perform repeated operations for purification.
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。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, and operations such as solvent extraction methods are also extremely complicated, resulting in recovery and purification. This will take a long time.
（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回収する方法を提供
するところにある。(Objective of the Invention) The object of the present invention is to perform industrial separation, recovery, and purification of metals using chemically modified chitosan, and to provide a method for recovering platinum group metals, which are extremely expensive among rare metals. It's there.
（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白金族金属を回収
するに際して、イミノ２酢酸を官能基として含有するキ
トサンを用いて吸着回収することを特徴とする貴金属の
回収方法で、前記吸着回収させる方法が白金族金属を含
有する溶液の酸度が０．５〜６Ｎである貴金属の回収方
法と、前記吸着させる方法が白金族金属を含有する溶液
の酸度を０．０５〜０．４Ｎとし、これに前記キトサン
を加えて攪拌しながら塩酸を加えて酸度を０．５Ｎ〜６
Ｎに調製して吸着させる貴金属の回収方法である。(Means for Solving the Problems) The present invention is characterized in that when recovering platinum group metals from a solution containing platinum group metals, adsorption and recovery is performed using chitosan containing iminodiacetic acid as a functional group. The method for recovering noble metals includes a method in which the method of adsorption and recovery is such that the acidity of the solution containing the platinum group metal is 0.5 to 6N, and a method in which the method of adsorption is such that the acidity of the solution containing the platinum group metal is 0.5 to 6N. The chitosan was added to this, and while stirring, hydrochloric acid was added to bring the acidity to 0.5N to 6N.
This is a method for recovering precious metals prepared and adsorbed by N.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
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〜Ｉ
Ｎ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。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 does not dissolve in sulfuric acid, but it dissolves in acetic acid, and in nitric acid and hydrochloric acid, it dissolves in 0.05N to I
N has a special property of dissolving in the concentration range, and resinized chitosan (containing aminocarboxylic acid functional groups) has the characteristic of not dissolving in the above acids, but the contact efficiency with the solution is low. There is a point where there is a decline.
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。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.
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７０〜９０℃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ＩＮの硫酸と水で洗浄し
た後乾燥させたものである。Chemically modified chitosan is obtained by stirring an aqueous solution containing chitosan and glyconitrile in ethanol at a temperature of 70 to 90°C for about 70 hours, washing the solid product with water, and reducing the amount by 30%.
70 at a temperature of 60-80°C in sodium hydroxide solution
After stirring for an hour, the solids were filtered, washed with IN sulfuric acid and water, and then dried.
本発明の方法は、まず白金族金属を含有する酸性溶液の
酸度を０． ５〜ＩＮ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４〜６重量倍量を加え攪拌して
吸着させる。In the method of the present invention, first, the acidity of an acidic solution containing a platinum group metal is reduced to 0. The chemically modified chitosan is prepared in an amount of 5 to 6 times the weight of the platinum group metal and is adsorbed by stirring.
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、５〜６Ｎの塩酸と該化学修飾キトサンとを混合攪
拌して濾過分離すると、吸着した白金族金属のうちパラ
ジウムが殆ど溶離させることができる。Next, the chemically modified chitosan adsorbed with platinum group metals is separated by filtration, and when the chemically modified chitosan is mixed and stirred with 5 to 6N hydrochloric acid and separated by filtration, most of the palladium among the adsorbed platinum group metals can be eluted. .
溶離したパラジウムは還元剤を加えて回収するかパラジ
ウム化合物として生成させてもよ（任意の処理をすれば
よいものである。The eluted palladium may be recovered by adding a reducing agent or may be produced as a palladium compound (any treatment may be performed).
また、パラジウムを溶離したのちの化学修飾キトサンは
０．１〜０．３Ｎ程度の塩酸に溶解し、還元剤を加えて
吸着していた白金を主とする白金族金属を還元して、濾
過分離して白金族金属は回収し、濾過分離した濾過液中
に含まれる化学修飾キトサンは塩酸を加えて０．５Ｎ以
上の酸度にすると再度沈澱してくるので、再使用するこ
とができる。In addition, the chemically modified chitosan after eluting palladium is dissolved in about 0.1 to 0.3N hydrochloric acid, and a reducing agent is added to reduce the adsorbed platinum group metals, which are then filtered and separated. The platinum group metals are recovered, and the chemically modified chitosan contained in the filtrate separated by filtration precipitates again when hydrochloric acid is added to bring the acidity to 0.5N or more, so it can be reused.
他の方法としては、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
金属含有量を吸着させるに必要な量を加える。Another method is to use an acidic solution containing platinum group metals at 0.
．． 05 to 0.4N, and add the chemically modified chitosan in an amount necessary to adsorb the platinum group metal content.
化学修飾キトサンは溶解するので攪拌混合しながら塩酸
を加えて酸度を０．５〜ＩＮに上げると沈澱してくる。Since chemically modified chitosan dissolves, it precipitates when hydrochloric acid is added while stirring and mixing to raise the acidity to 0.5 to IN.
該沈澱を濾過分離し、ＩＮ塩酸で洗浄すれば白金族金属
を吸着させることができ、銅などの卑金属を塩酸で溶離
させることができる。If the precipitate is separated by filtration and washed with IN hydrochloric acid, platinum group metals can be adsorbed, and base metals such as copper can be eluted with hydrochloric acid.
該白金族金属を吸着した化学修飾キトサンを再度０．１
〜０．３Ｎ塩酸に溶解し、還元剤を加えて白金族金属を
還元させて回収する。The chemically modified chitosan that has adsorbed the platinum group metal is again 0.1
Dissolve in ~0.3N hydrochloric acid and add a reducing agent to reduce and recover the platinum group metal.
以上のような方法を行うことができるのは、本発明に用
いる化学修飾キトサンの特徴として、塩酸および硝酸に
は０．０５〜０．５Ｎの濃度で溶解し、０．０１Ｎでは
溶解せず、またＩＮ以上でも溶解しない。The above method can be carried out because of the characteristics of the chemically modified chitosan used in the present invention, which dissolves in hydrochloric acid and nitric acid at a concentration of 0.05 to 0.5N, but does not dissolve at 0.01N. Also, it does not dissolve even at IN or higher.
また、硫酸および酢酸には溶解しないという極めて特異
なものであるからである。Furthermore, it is extremely unique in that it does not dissolve in sulfuric acid or acetic acid.
また化学修飾キトサンに吸着している白金族金属は、焼
却して王水抽出などの工程を経て回収することもできる
。Furthermore, the platinum group metals adsorbed on chemically modified chitosan can also be recovered through a process such as incineration and aqua regia extraction.
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。Examples related to the present invention will be described below, but the examples are not intended to limit the present invention.
（実施例１）
塩酸濃度０．５〜６規定の間について、化学修飾キトサ
ンに対する、パラジウム、白金およびロジウムの分配比
を求めた結果について図に示す。(Example 1) The results of determining the distribution ratios of palladium, platinum, and rhodium with respect to chemically modified chitosan at a hydrochloric acid concentration of 0.5 to 6 normal are shown in the figure.
塩酸濃度が高くなるにつれて、分配比が低下してい（こ
とがわかる。またパラジウムよりも白金のほうが分配比
が高いことを示している。塩酸濃度ｌ規定以下では、パ
ラジウム、白金とも分配比が１００以上あり、化学修飾
キトサンが吸着特性に優れていることを示しており、工
業的に化学修飾キトサンをパラジウム、白金およびロジ
ウムの回収に使用できることを示している。It can be seen that as the hydrochloric acid concentration increases, the distribution ratio decreases. It also shows that the distribution ratio of platinum is higher than that of palladium. When the concentration of hydrochloric acid is below l, the distribution ratio of both palladium and platinum is 100. The above results indicate that chemically modified chitosan has excellent adsorption properties, and indicate that chemically modified chitosan can be used industrially for the recovery of palladium, platinum, and rhodium.
（実施例２）
Ｐｔ、Ｐｄ、Ｒｈをそれぞれ１００ｍｇ／Ｉ！含有する
Ｃｕ、Ｚｎ等の卑金属を２０ ｇ／Ｉ！含有するＩＮ塩
酸溶液１１に化学修飾したキトサン３．５ｇを加えて攪
拌し１２０分間保持したのち、濾過分離して、濾過液中
のＰｔ、Ｐｄ、Ｒｈを分析したところ、それぞれ１ ｍ
ｇ ／ Ｉ！以下であった。(Example 2) Pt, Pd, Rh each at 100 mg/I! Contains 20 g/I of base metals such as Cu and Zn! 3.5 g of chemically modified chitosan was added to the IN hydrochloric acid solution 11, stirred and held for 120 minutes, and separated by filtration. Pt, Pd, and Rh in the filtrate were analyzed.
g/I! It was below.
前記濾過分離した化学修飾キトサンを５Ｎ塩酸１００ｍ
１に入れ攪拌して１２０分間保持し、濾過分離したとこ
ろ、５Ｎ塩酸中のパラジウムは９０ｍｇでＰｔ、Ｒｈは
検出されなかった。The chemically modified chitosan separated by filtration was dissolved in 100ml of 5N hydrochloric acid.
1, stirred, held for 120 minutes, and filtered and separated. As a result, palladium in 5N hydrochloric acid was 90 mg, and no Pt or Rh was detected.
次いで、５Ｎ塩酸でパラジウムを溶離した化学修飾キト
サンを０．ＩＮ塩酸に溶解し、ＳＢＨを加えて還元させ
たところ金属粉末が沈澱した。Then, the chemically modified chitosan with palladium eluted with 5N hydrochloric acid was diluted with 0. When dissolved in IN hydrochloric acid and reduced by adding SBH, metal powder was precipitated.
これを、濾過分離して、濾過液中のＰｔ、Ｐｄ、Ｒｈを
分析したところ検出されなかった。When this was separated by filtration and the filtrate was analyzed for Pt, Pd, and Rh, none were detected.
なお、濾過液に塩酸を加えて０．５Ｎの酸度にしたとこ
ろ沈澱が生成したので、Ｐｉ、Ｐｄ、Ｒｈをそれぞれ１
００ｍｇ／７含有するＣｕ、Ｚｎ等の卑金属を２０ｇ／
Ａ含有するＩＮ塩酸溶液１１を加え攪拌し１２０分間保
持したのち、濾過分離して、濾過液中のＰｔ、Ｐｄ、Ｒ
ｈを分析したところ、それぞれ１ ｍ ｇ ／ Ｉ！以
下であった。In addition, when hydrochloric acid was added to the filtrate to make the acidity 0.5N, a precipitate was formed, so Pi, Pd, and Rh were added to 1
Base metals such as Cu and Zn containing 00mg/7
After adding IN hydrochloric acid solution 11 containing A and stirring and holding for 120 minutes, the filtrate was separated by filtration to remove Pt, Pd, and R in the filtrate.
h was analyzed, and each was found to be 1 mg/I! It was below.
（実施例３）
Ｐｔ、Ｐｄ、Ｒｈをそれぞれ１００ｍｇ／Ａ含有するＣ
ｕ、Ｚｎ等の卑金属を２０ｇ／Ａ含有するＯ、ＩＮ塩酸
溶液ＩＡに化学修飾したキトサン３．５ｇを加えて攪拌
し、塩酸を加えて酸度を０．５Ｎに上げ１２０分間保持
したのち、濾過分離して、濾過液中のＰｔ、Ｐｄ、Ｒｈ
を分析したところ、それぞれ１ｍｇ／Ｉ！以下であった
。(Example 3) C containing 100 mg/A each of Pt, Pd, and Rh
3.5 g of chemically modified chitosan was added to O, IN hydrochloric acid solution IA containing 20 g/A of base metals such as U and Zn, stirred, and the acidity was raised to 0.5 N by adding hydrochloric acid and held for 120 minutes, followed by filtration. Separate and Pt, Pd, Rh in the filtrate
When analyzed, each was found to be 1mg/I! It was below.
前記濾過分離した化学修飾キトサンをＩＮ塩酸２００−
に入れ攪拌して１２０分間保持し、濾過分離し、次いで
、ＩＮ塩酸で処理した化学修飾キトサンに水を加えて０
．ＩＮ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。The chemically modified chitosan separated by filtration was treated with IN hydrochloric acid 200-
stirred and held for 120 minutes, filtered and separated, then water was added to the chemically modified chitosan treated with IN hydrochloric acid to
．． When SBH was added as IN hydrochloric acid for reduction, metal powder was precipitated.
これを、濾過分離して、濾過液中のＰｔ、Ｐｄ、Ｒｈを
分析したところ検出されなかった。When this was separated by filtration and the filtrate was analyzed for Pt, Pd, and Rh, none were detected.
なお、濾過液に塩酸を加えて０．５Ｎの酸度にしたとこ
ろ沈澱が生成したので、濾過分離して該沈澱をＰｔ、Ｐ
ｄ、Ｒｈをそれぞれ１００ｍｇ／ｌ含有するＣｕ、Ｚｎ
等の卑金属を２０ｇ／ｌ含有する０、３Ｎ塩酸溶液１１
を加え攪拌し１２０分間保持したのち、濾過分離して、
濾過液中のＰｔ、Ｐｄ、Ｒｈを分析したところ、それぞ
れ１ｍ ｇ ／ １２以下であった。In addition, when hydrochloric acid was added to the filtrate to make the acidity 0.5N, a precipitate was formed.
Cu, Zn each containing 100 mg/l of d and Rh
0.3N hydrochloric acid solution containing 20g/l of base metals such as 11
was added, stirred and held for 120 minutes, then filtered and separated.
When Pt, Pd, and Rh in the filtrate were analyzed, they were each 1 mg/12 or less.
（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をそれぞれ１００ｍｇ／ｉ含有するＣｕ、Ｚｎ等
の卑金属を２０ｇ／ｌ含有する０、５Ｎ塩酸溶液１１！
を空間速度５Ｖ＝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はそれぞれ１ｍｇ／ｆ
以下であった。(Example 4) Chemically modified chitosan was packed into a glass column, and Pt, Pd
, 0.5N hydrochloric acid solution containing 20g/l of base metals such as Cu and Zn, each containing 100mg/i of Rh!11!
When the liquid was passed through it at a space velocity of 5 V = 0.2, Pt, Pd, and Rh were each 1 mg/f in the liquid after passing.
It was below.
次いで、化学修飾キトサン層をＩＮ塩酸２００−を５Ｖ
＝０．２で通液して洗浄したのち、該化学修飾キトサン
をガラスカラムより取り出し、７５０℃で灰化して、水
素炎で還元したところ２９５ｍｇの金属粉末が得られた
。Then, the chemically modified chitosan layer was heated with 200V of IN hydrochloric acid at 5V.
After washing by passing a liquid through the column at a temperature of 0.2, the chemically modified chitosan was taken out from the glass column, incinerated at 750° C., and reduced with a hydrogen flame to obtain 295 mg of metal powder.
（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、ロジウムの
回収を可能とした。(Effect of the invention) Conventionally, it was difficult to use chitosan industrially, but
The present invention has made it possible to recover industrially valuable palladium, platinum, and rhodium.
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。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.
また従来、パラジウム、白金、ロ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。In addition, conventionally, in the recovery of palladium, platinum, and rhodium, dilute solutions and those containing a large amount of base metal had to go through various processes, but the present invention allows palladium, platinum, and rhodium to be concentrated and separated from the base metal. There are also some benefits that can be obtained by doing so.
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。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.
一図は、化学修飾キトサンにおけるパラジウム、白金お
よびロジウムの吸着の分配比について塩酸濃度との関係
を表したグラフである。
出願人 田中貴金属工業株式会社FIG. 1 is a graph showing the relationship between the adsorption distribution ratio of palladium, platinum, and rhodium in chemically modified chitosan and the concentration of hydrochloric acid. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.
Claims (3)
に際して、イミノ２酢酸を官能基として含有するキトサ
ンを用いて吸着回収することを特徴とする貴金属の回収
方法。(1) A method for recovering a noble metal, which comprises collecting a platinum group metal from a solution containing a platinum group metal by adsorption using chitosan containing iminodiacetic acid as a functional group.
溶液の酸度が０．５〜６Ｎである請求項１に記載の貴金
属の回収方法。(2) The method for recovering noble metals according to claim 1, wherein the method for adsorption and recovery is such that the acidity of the solution containing the platinum group metal is 0.5 to 6N.
の酸度を０．０５〜０．４Ｎとし、これに前記キトサン
を加えて攪拌しながら塩酸を加えて酸度を０．５Ｎ〜６
Ｎに調製して吸着させる請求項１に記載の貴金属の回収
方法。(3) The method of adsorption is to adjust the acidity of the solution containing the platinum group metal to 0.05-0.4N, add the chitosan to this, add hydrochloric acid while stirring, and adjust the acidity to 0.5N-6.
2. The method for recovering precious metals according to claim 1, which comprises preparing and adsorbing N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26022290A JPH04141533A (en) | 1990-09-28 | 1990-09-28 | Method for recovering noble metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26022290A JPH04141533A (en) | 1990-09-28 | 1990-09-28 | Method for recovering noble metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04141533A true JPH04141533A (en) | 1992-05-15 |
Family
ID=17345049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26022290A Pending JPH04141533A (en) | 1990-09-28 | 1990-09-28 | Method for recovering noble metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04141533A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0628655A1 (en) * | 1993-06-11 | 1994-12-14 | Ciba-Geigy Ag | Bleaching aids |
| WO1999014385A1 (en) * | 1997-09-17 | 1999-03-25 | Anglo American Platinum Corporation Limited | Separation of platinum group metals |
| JP2015183228A (en) * | 2014-03-24 | 2015-10-22 | 田中貴金属工業株式会社 | separation method of palladium and platinum |
-
1990
- 1990-09-28 JP JP26022290A patent/JPH04141533A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0628655A1 (en) * | 1993-06-11 | 1994-12-14 | Ciba-Geigy Ag | Bleaching aids |
| WO1999014385A1 (en) * | 1997-09-17 | 1999-03-25 | Anglo American Platinum Corporation Limited | Separation of platinum group metals |
| US6364931B1 (en) | 1997-09-17 | 2002-04-02 | Anglo American Platinum Limited | Separation of platinum group metals |
| JP2015183228A (en) * | 2014-03-24 | 2015-10-22 | 田中貴金属工業株式会社 | separation method of palladium and platinum |
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