JPS63103825A - Separation method for rare earth element - Google Patents
Separation method for rare earth elementInfo
- Publication number
- JPS63103825A JPS63103825A JP61245490A JP24549086A JPS63103825A JP S63103825 A JPS63103825 A JP S63103825A JP 61245490 A JP61245490 A JP 61245490A JP 24549086 A JP24549086 A JP 24549086A JP S63103825 A JPS63103825 A JP S63103825A
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- eluent
- earth elements
- earth element
- exchange resin
- 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
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 40
- 238000000926 separation method Methods 0.000 title abstract description 6
- 239000003480 eluent Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000002378 acidificating effect Effects 0.000 claims abstract description 15
- 150000001261 hydroxy acids Chemical class 0.000 claims abstract description 15
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003729 cation exchange resin Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 abstract description 3
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 150000001768 cations Chemical class 0.000 description 4
- 238000005342 ion exchange Methods 0.000 description 4
- 239000004310 lactic acid Substances 0.000 description 4
- 235000014655 lactic acid Nutrition 0.000 description 4
- 229910052688 Gadolinium Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 3
- 239000003456 ion exchange resin Substances 0.000 description 3
- 229920003303 ion-exchange polymer Polymers 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- -1 rare earth ions Chemical class 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- BWLBGMIXKSTLSX-UHFFFAOYSA-N 2-hydroxyisobutyric acid Chemical compound CC(C)(O)C(O)=O BWLBGMIXKSTLSX-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NGEWQZIDQIYUNV-UHFFFAOYSA-N L-valinic acid Natural products CC(C)C(O)C(O)=O NGEWQZIDQIYUNV-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229940023913 cation exchange resins Drugs 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- 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、希土類元素のイオン交換法による分離方法に
関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for separating rare earth elements using an ion exchange method.
（従来の技術）
希土類元素を、イオン交換法によシ各元素に分離する方
法は公知である。この方法は各種の希土類元素を含む水
溶液を、イオン交換樹脂を充填したカラムに通液し、希
土類元素をカラムに吸着させＥＤＴＡやヒドロキシ酸な
どの溶離液を上記カラムに通し、吸着した希土類元素を
溶離展開させ、各元素毎に分離する方法である。(Prior Art) A method of separating rare earth elements into various elements by an ion exchange method is known. In this method, an aqueous solution containing various rare earth elements is passed through a column packed with ion exchange resin, the rare earth elements are adsorbed onto the column, and an eluent such as EDTA or hydroxy acid is passed through the column to remove the adsorbed rare earth elements. This is a method of elution and development to separate each element.
この方法は、物理的・化学的性質が近似しておシ、分離
することが困難な希土類元素混合物を各種の元窒に精度
よく分離できる極めて有力な方法である。This method is an extremely effective method for accurately separating rare earth element mixtures, which have similar physical and chemical properties and are difficult to separate, into various basic nitrogen elements.
各元素毎に分離された溶出液は、希土類元素と溶離液と
の混合物化合物又は錯体であるがこれに蓚酸などを添加
して沈殿を析出せしめ、この沈殿を濾過して希土類元素
を回収する。この場合に、沈殿を濾過しだ液から溶離液
を回収しないと大量の溶離剤が無駄となシ好ましくない
。溶離液として、ＥＤＴＡを使用した場合は、蓚酸を加
える前に、−を１前後に調整してＥＤＴＡを析出させ、
予めＥＤＴＡを分離回収する。The eluate separated for each element is a mixture compound or complex of the rare earth element and the eluent, and oxalic acid or the like is added to it to precipitate it, and this precipitate is filtered to recover the rare earth element. In this case, unless the precipitate is filtered and the eluent is recovered from the soot, a large amount of eluent will be wasted, which is undesirable. When EDTA is used as an eluent, before adding oxalic acid, adjust - to around 1 to precipitate EDTA.
EDTA is separated and recovered in advance.
ヒドロキシ酸系の溶離液の回収法として、特公昭５０−
３９７５に開示された方法がある。As a method for recovering hydroxy acid-based eluents,
There is a method disclosed in No. 3975.
この方法は、分離された希土類元素を含有する溶出液を
弱酸性陽イオン交換樹脂層に通して、弱酸性陽イオン交
換樹脂層に、分離された希土類イオンを吸着せしめて溶
離液を回収循環再使用するとともに、別に鉱酸を用いて
弱酸性陽イオン交換樹脂層に吸着された希土類元素を濃
厚溶液として溶出せしめるものである。In this method, the eluate containing the separated rare earth elements is passed through a weakly acidic cation exchange resin layer, the separated rare earth ions are adsorbed on the weakly acidic cation exchange resin layer, and the eluate is recovered and recycled. At the same time, the rare earth elements adsorbed on the weakly acidic cation exchange resin layer are eluted as a concentrated solution using a mineral acid.
しかしこの場合′、溶離液のクエン酸濃度が０．１−程
度であり、この濃度が高いと、吸着がおこらす溶離液と
希土類元素との分離ができず、溶離液の回収が困難とな
る。However, in this case, the citric acid concentration of the eluent is about 0.1-, and if this concentration is high, the eluent, which causes adsorption, cannot be separated from the rare earth element, making it difficult to recover the eluent. .
希土類元素を陽イオン交換体を用いて分離するに当り、
処理量を上げて生産性を向上する為には溶離液の濃度を
あげる必要があシ、高濃度の溶離液の回収方法の開発が
望まれていた。When separating rare earth elements using a cation exchanger,
In order to increase throughput and improve productivity, it is necessary to increase the concentration of the eluent, and it has been desired to develop a method for recovering high-concentration eluent.
なお、溶離液としては、ＥＤＴＡや乳酸など各種ヒドロ
キシ酸が使用されるが、ヒドロキシ酸のナトリウム型ア
ンモニア型のものを使用すれば、ｇＤＴＡを使用すると
きのように、保持イオンとして、Ｃｕ２＋イオン等を吸
着させる必要がない。即ち、ヒドロキシ酸を使用すれば
、希土類元素の分離と樹脂の再生が同時にでき極めて経
済的である。Various hydroxy acids such as EDTA and lactic acid are used as the eluent, but if sodium or ammonia type hydroxy acids are used, Cu2+ ions, etc. will be retained as retained ions, as is the case when gDTA is used. There is no need to adsorb it. That is, if a hydroxy acid is used, the rare earth element can be separated and the resin can be regenerated at the same time, which is extremely economical.
（発明が解決しようとする問題点）
本発明は、上記の従来の技術の欠点を改善して、ヒドロ
キシ酸を用いた溶離液の回収方法、特に溶離液の濃度が
高い場合においても利用できる回収方法を提供しようと
するものである。(Problems to be Solved by the Invention) The present invention improves the drawbacks of the above-mentioned conventional techniques and provides a method for recovering an eluent using a hydroxy acid, which can be used especially when the concentration of the eluent is high. It is intended to provide a method.
（問題点を解決するだめの手段）
本発明は、イオン交換法によシ希土類元素を分離する際
に溶離液として用いたヒドロキシ酸を効率よく回収する
だめの方法を提供するものであり、その要旨は溶離液に
ヒドロキシ酸を用い、イオン交換体によって希土類元素
を分離する方法において、強酸性の陽イオン交換樹脂を
用いて溶離液を回収することを特徴とする希土類元素の
分離方法である。(Alternative Means to Solve the Problems) The present invention provides an alternative method for efficiently recovering hydroxy acids used as eluents when separating rare earth elements by an ion exchange method. The gist is a method for separating rare earth elements using a hydroxy acid as an eluent and separating rare earth elements using an ion exchanger, which is characterized by recovering the eluent using a strongly acidic cation exchange resin.
第１図に、イオン交換樹脂を使用した希土類元素の分離
方法の概略を示す工程図を示す。原液タンク１には、分
離すべき各種希土類元素を含む水溶液が貯えられておシ
、この原液が分離カラム３に通液され、分離カラムに希
土類元素が吸７”ｎされる。分離カラムには、通常ダウ
エックス５ＱＷ−Ｘ８等のイオン交換樹脂が充填されて
いる。FIG. 1 shows a process diagram outlining a method for separating rare earth elements using an ion exchange resin. The stock solution tank 1 stores an aqueous solution containing various rare earth elements to be separated, and this stock solution is passed through the separation column 3, and the rare earth elements are absorbed into the separation column. , usually filled with an ion exchange resin such as DOWEX 5QW-X8.
吸着後、溶離液タンク２よｐ１溶離液をカラムに通し、
吸着された希土類元素を展開分離する。After adsorption, pass the p1 eluent from eluent tank 2 through the column,
The adsorbed rare earth elements are developed and separated.
溶離液としては、ヒドロキシ酸例えばクエン酸、グリコ
ール酸、乳酸、酒石酸、αヒドロキシイソ酪酸などが使
用される。希土類元素は、その吸着能の差異によシ分離
される。カラムの末端に設置された検出器５によシ、希
土類元素を検知し、レシーバ−タンクに各元素毎に溶出
液を貯える。レシーバ−タンクは、分離する希土類元素
の数だけ設置され、検出器により、各元素を検出し、元
素毎に切シ換えて使用される。As the eluent, hydroxy acids such as citric acid, glycolic acid, lactic acid, tartaric acid, α-hydroxyisobutyric acid, etc. are used. Rare earth elements are separated based on differences in their adsorption capacities. A detector 5 installed at the end of the column detects the rare earth elements, and the eluate for each element is stored in a receiver tank. Receiver tanks are installed as many as the number of rare earth elements to be separated, each element is detected by a detector, and the receiver tanks are switched and used for each element.
これら溶出液は、各希土類元素と溶離液との化合物又は
混合物であり溶離液を効率よく回収するためには、溶離
液中の希土類を高収率で分離する必要がある。この溶出
液を、強酸性の陽イオン交換樹脂を充填したカラムに通
液することによシ布土類元素が前述の強酸性陽イオン交
換樹脂に吸着され、希土類元素を含まない溶離液が回収
される。These eluates are compounds or mixtures of each rare earth element and the eluent, and in order to efficiently recover the eluate, it is necessary to separate the rare earths in the eluate at a high yield. By passing this eluate through a column filled with a strongly acidic cation exchange resin, the rare earth elements are adsorbed by the strongly acidic cation exchange resin, and an eluate free of rare earth elements is recovered. be done.
強酸性陽イオン交換樹脂とは、例えばダウエックス５０
Ｗ−Ｘ８等が使用できる。又、特公昭５０−３９７５に
開示されているような弱酸性陽イオン交換樹脂を使用す
るときは０．１％程度の低温度のヒドロキシ酸の場合は
、適用できるが１％以上の温度になると吸着した希土類
元素が再度溶出するために希土類と溶離液との分離がで
きない。Strongly acidic cation exchange resins include, for example, DOWEX 50.
W-X8 etc. can be used. Also, when using a weakly acidic cation exchange resin as disclosed in Japanese Patent Publication No. 50-3975, it can be applied to a hydroxy acid at a low temperature of about 0.1%, but when the temperature exceeds 1%, Since the adsorbed rare earth elements are eluted again, it is not possible to separate the rare earth elements from the eluent.
強酸性の陽イオン交換体に吸着した高純度の希土類元素
は、高濃度の鉱酸、塩素、硝酸、過塩素酸や回収容易な
ＥＤＴＡによシ容易に回収できる。Highly purified rare earth elements adsorbed on a strongly acidic cation exchanger can be easily recovered using highly concentrated mineral acids, chlorine, nitric acid, perchloric acid, or easily recovered EDTA.
この操作は第１図に示した工程図のレシーバ−タンクの
後に、強酸性の陽イオン交換体を充填したカラムを接続
して連続的に行ってもよいし、分離操作とは別にハツチ
式に行ってもよい。This operation may be performed continuously by connecting a column packed with a strongly acidic cation exchanger after the receiver tank in the process diagram shown in Figure 1, or it may be performed in a hatch type separately from the separation operation. You may go.
（実施例）
本発明の方法を実施例によυさらに詳細に説明するが、
本発明はこれに限定されるものではない。(Example) The method of the present invention will be explained in more detail with reference to an example.
The present invention is not limited to this.
強酸性の陽イオン交換体ＫＳ−８０１、ＫＳ−８０２、
Ｔ −１６−４５等によシ分離された希土類元素ガドリ
ウムを含む５％乳酸溶液１００ｍ１（ガドリウム濃度４
３５ ｐｐｍ ）を強酸性陽イオン交換樹脂（ダウエッ
クス５ＱＷ−Ｘ８ ）を充填した塩化ビニル製カラム（
直径１０噸、長さ１００ ｒｙｓ ）に通した。さらに
、蒸留水２０ｍ１で洗った後溶出液を集めたところ１１
２ｍ１あシ、その溶液をＩＣＰ （誘導結合プラズマ発
色分析法）によシ分析したところ、ガドリウムは検出さ
れなかった。又、乳酸を液体クロマトグラフィーによシ
分析したところ回収率は９９チ以上であった。Strongly acidic cation exchanger KS-801, KS-802,
100 ml of 5% lactic acid solution containing the rare earth element gadolinium separated by T-16-45 etc. (gadolinium concentration 4
A vinyl chloride column (35 ppm) packed with a strongly acidic cation exchange resin (Dowex 5QW-X8)
10 mm in diameter and 100 rys in length). Furthermore, after washing with 20 ml of distilled water, the eluate was collected.
When the 2 ml solution was analyzed by ICP (Inductively Coupled Plasma Colorimetric Spectrometry), no gadolinium was detected. When lactic acid was analyzed by liquid chromatography, the recovery rate was over 99%.
尚希釈された溶離液は蒸留、膜濃縮など公知の方法で濃
縮できるので、循環して溶離液として再利用できる。Since the diluted eluent can be concentrated by a known method such as distillation or membrane concentration, it can be recycled and reused as an eluent.
（゛幼果）
本発明の方法によれば、簡単な方法により効率よく溶出
液中の希土類元素を除去できるので、ヒドロキシ酸の溶
離液の回収が能率よくでき、溶離液を循環使用できる。(Young fruit) According to the method of the present invention, the rare earth elements in the eluate can be efficiently removed by a simple method, so the hydroxy acid eluate can be efficiently recovered and the eluate can be recycled.
従って、イオン交換体を用いる希土類元素の分離が極め
て経済的に行いうる。Therefore, separation of rare earth elements using an ion exchanger can be carried out very economically.
第１図はイオン交換法による希土類元素の分離方法の一
般的な工程図である。FIG. 1 is a general process diagram of a method for separating rare earth elements using an ion exchange method.
Claims (1)
土類元素を分離する方法において、強酸性の陽イオン交
換樹脂を用いて溶離液を回収することを特徴とする希土
類元素の分離方法A method for separating rare earth elements using a hydroxy acid as an eluent and separating rare earth elements using an ion exchanger, the method comprising recovering the eluent using a strongly acidic cation exchange resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61245490A JPS63103825A (en) | 1986-10-17 | 1986-10-17 | Separation method for rare earth element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61245490A JPS63103825A (en) | 1986-10-17 | 1986-10-17 | Separation method for rare earth element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63103825A true JPS63103825A (en) | 1988-05-09 |
Family
ID=17134434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61245490A Pending JPS63103825A (en) | 1986-10-17 | 1986-10-17 | Separation method for rare earth element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63103825A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01111827A (en) * | 1987-10-26 | 1989-04-28 | Tosoh Corp | Treatment of aqueous solution consisting of rare earth element and complex forming agent |
| JP2014521076A (en) * | 2011-07-15 | 2014-08-25 | イーテーエム イゾトーペン テクノロジエン ミュンヘン アーゲー | Production method of carrier-free high purity (177) Lu compound and carrier-free (177) Lu compound |
-
1986
- 1986-10-17 JP JP61245490A patent/JPS63103825A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01111827A (en) * | 1987-10-26 | 1989-04-28 | Tosoh Corp | Treatment of aqueous solution consisting of rare earth element and complex forming agent |
| JP2014521076A (en) * | 2011-07-15 | 2014-08-25 | イーテーエム イゾトーペン テクノロジエン ミュンヘン アーゲー | Production method of carrier-free high purity (177) Lu compound and carrier-free (177) Lu compound |
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