JPS63182216A - Method for separation and recovery of rare earth element - Google Patents
Method for separation and recovery of rare earth elementInfo
- Publication number
- JPS63182216A JPS63182216A JP62008889A JP888987A JPS63182216A JP S63182216 A JPS63182216 A JP S63182216A JP 62008889 A JP62008889 A JP 62008889A JP 888987 A JP888987 A JP 888987A JP S63182216 A JPS63182216 A JP S63182216A
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- earth element
- alloy
- acid
- earth elements
- 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 43
- 238000000034 method Methods 0.000 title claims description 17
- 238000011084 recovery Methods 0.000 title description 19
- 238000000926 separation method Methods 0.000 title description 5
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 28
- 239000000956 alloy Substances 0.000 claims abstract description 28
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 24
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 abstract description 4
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002244 precipitate Substances 0.000 abstract description 4
- 150000007513 acids Chemical class 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000003002 pH adjusting agent Substances 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract 1
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 abstract 1
- 150000002910 rare earth metals Chemical class 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229910000531 Co alloy Inorganic materials 0.000 description 4
- 229910001172 neodymium magnet Inorganic materials 0.000 description 4
- 150000003891 oxalate salts Chemical class 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 229940023569 palmate Drugs 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、例えば希土類磁石用合金屑からの希土類元素
の分離回収方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for separating and recovering rare earth elements from, for example, alloy scrap for rare earth magnets.
（従来の技術）
最近、希土類元素合金が磁性材料として注目されてきて
おり、中でもＳｍＣｏ５ 、ＳｍＣｏｑ 、５ｌｌｔＣ
Ｑ＋ｔなどのＳｔａ −Ｃｏ系、並びにＮｄｚＦ Ｑ
＋ ＪなどのＮｄ−Ｆｅ−Ｂ系などの希土類磁石用合金
が知られている。(Prior art) Rare earth element alloys have recently attracted attention as magnetic materials, and among them, SmCo5, SmCoq, 5lltC
Sta-Co series such as Q+t, as well as NdzF Q
Rare earth magnet alloys such as Nd-Fe-B series such as +J are known.
ところで、かかる合金を使用して磁性部材を製造した後
、当然のことながら、合金屑が生じる。By the way, after manufacturing a magnetic member using such an alloy, alloy waste is naturally generated.
周知のように、希土類元素は高価なものが多いので、こ
れらの合金屑から希土類元素を分離回収して再利用する
ことが望まれている。As is well known, many rare earth elements are expensive, so it is desired to separate and recover rare earth elements from these alloy scraps and reuse them.
従来、このような希土類合金から希土類元素を分離回収
する方法としては、該合金から溶媒抽出法により希土類
元素を分離したのち、しゅう酸を添加してしゅう酸塩と
して回収する方法が知られている。Conventionally, a known method for separating and recovering rare earth elements from such rare earth alloys is to separate rare earth elements from the alloy by a solvent extraction method, and then add oxalic acid to recover them as oxalates. .
（発明が解決しようとする問題点）
しかしながら、かかる方法は連続処理法であるため、大
量の希土類元素の処理には有効であるものの、処理量が
比較的少量である場合の工業的な利用は未だ充分とは言
い難い。(Problems to be Solved by the Invention) However, since this method is a continuous processing method, although it is effective for processing large amounts of rare earth elements, it cannot be used industrially when the processing amount is relatively small. It is still far from sufficient.
本発明は上記従来の問題点に鑑みてなされたもので、例
えば希土類磁石用合金屑から希土類元素を分離回収する
に際し、回収率が高く、しかも回収された希土類元素が
高純度である希土類元素の分離回収方法を提供すること
を目的とする。The present invention has been made in view of the above-mentioned conventional problems. The purpose is to provide a separation and recovery method.
（問題点を解決するための手段および作用）本発明は、
先ず希土類元素を含有する合金を無機酸に溶解し、この
溶液にしゅう酸を添加して希土類元素をしゅう酸塩とし
て析出させるに当たり、前記溶液のｐＨと希土類元素の
回収率及び純度との間に密接な関係があるという知見に
基づくものである。(Means and effects for solving the problems) The present invention has the following features:
First, an alloy containing a rare earth element is dissolved in an inorganic acid, and oxalic acid is added to this solution to precipitate the rare earth element as an oxalate. This is based on the knowledge that there is a close relationship.
即ち、本発明は希土類元素を含有する合金から希土元素
を分離回収する方法において、前記合金を無機酸に溶解
して不溶残渣を除去したのち、得られた溶液にしゅう酸
を添加するとともに、ｐＨを０．５〜２．０の範囲に調
整して前記希土類元素をしゅろ酸塩として析出させるこ
ととしたものである。That is, the present invention provides a method for separating and recovering rare earth elements from an alloy containing rare earth elements, in which the alloy is dissolved in an inorganic acid to remove insoluble residues, and then oxalic acid is added to the resulting solution. The rare earth element is precipitated as palmate by adjusting the pH to a range of 0.5 to 2.0.
本発明の希土類元素の分離回収方法において、出発物質
である希土類合金としては、希土類元素を含むものであ
れば、と（に限定されるものではないが、前述したよう
な、Ｓｍ−Ｃｏ系及びＮｄ−Ｆｅ−Ｂ系合金を始めとす
る希土類磁石用合金などをあげることができる。In the rare earth element separation and recovery method of the present invention, the rare earth alloy that is the starting material may include (but is not limited to) those containing rare earth elements, such as Sm-Co and Examples include alloys for rare earth magnets, including Nd-Fe-B alloys.
以下、本発明による分離回収工程を順を追って説明する
。Hereinafter, the separation and recovery process according to the present invention will be explained step by step.
先ず、希土類合金を無機酸に溶解する。この無機酸とし
ては希土類合金を溶解するものであればよいが、合金溶
解時に残渣が殆ど残らないものとして、塩酸、硝酸、及
びこれら２種の混酸（体積比で３：１）である王水をあ
げることができる。First, a rare earth alloy is dissolved in an inorganic acid. This inorganic acid may be any inorganic acid that can dissolve the rare earth alloy, but hydrochloric acid, nitric acid, and aqua regia, which is a mixed acid of these two (3:1 by volume), can be used as an inorganic acid that leaves almost no residue when the alloy is dissolved. can be given.
第１図は上記の各酸によりＳｍ−Ｃｏ合金を溶解した時
の分解残渣の割合（％ンを示すものであり、特に塩酸及
び王水が好適であることが図からも明らかである。なお
、この無機酸による溶解時に適当な温度に加熱してもよ
い。Figure 1 shows the proportion (%) of decomposition residue when Sm-Co alloy is dissolved with each of the acids mentioned above, and it is clear from the figure that hydrochloric acid and aqua regia are particularly suitable. , and may be heated to an appropriate temperature during dissolution with this inorganic acid.
次いで、上記により得られた酸溶液をろ過もしくは遠心
分離することにより、不溶残渣を除去したのち、得られ
た溶液にしゅう酸を添加するとともに当該溶液のｐＨ１
）１整を行う、この工程は、しゅろ酸を添加したのちに
溶液のｐＨを調整することとしても、また逆に、最初に
溶液のｐ）（をある程度調整しておき、次いで、しゅう
酸を添加することとしてもよく、とにかく最終的な液の
ｐＨが上記した値、即ち、０．５〜２．０となるように
すれば特に限定されるものではない。Next, the acid solution obtained above is filtered or centrifuged to remove insoluble residues, and then oxalic acid is added to the solution obtained, and the pH of the solution is adjusted to 1.
) This step can be used to adjust the pH of the solution after adding oxalic acid, or conversely, first adjust the p)( of the solution to some extent, then add oxalic acid. may be added, and there is no particular limitation as long as the pH of the final solution is the above-mentioned value, that is, 0.5 to 2.0.
第２図は希土類元素としてＳｍを使用した場合のしゅう
酸の添加量とＳｍの回収率との関係を示し、横軸はしゅ
う酸（Ｈｚ Ｃｔ Ｏａ）／ Ｓ ｍモル比を、縦軸は
Ｓｍ回収率（％）を夫々表す、この図からも明らかなよ
うに、しゅう酸の添加量はモル比で希土類元素の１．５
倍以上であることが好ましく、特に、１．５〜２．５倍
が好適である。Figure 2 shows the relationship between the amount of oxalic acid added and the recovery rate of Sm when Sm is used as the rare earth element, with the horizontal axis representing the oxalic acid (Hz Ct Oa)/S m molar ratio and the vertical axis representing the Sm As is clear from this figure, which shows the recovery rate (%), the amount of oxalic acid added is 1.5 molar ratio of the rare earth elements.
It is preferably at least twice as large, and particularly preferably from 1.5 to 2.5 times.
上述したように、溶液の最終的なｐ）ｌの値は０．５〜
２．０の範囲になるようにすることが必要である。As mentioned above, the final p)l value of the solution is between 0.5 and
It is necessary to keep it within the range of 2.0.
これは、次のような理由による。即ち、３ｍ−Ｃ。This is due to the following reasons. That is, 3m-C.
合金を塩酸に溶解させた溶液から、しゅう酸を添加した
のちに、ｐＨを調整してＳｍをＳｍ、０３として回収す
る場合を例にとると、Ｓｍ回収率とｐ）（との関係、及
び、回収されたＳ１０．の純度とｐＨとの関係は夫々第
３図及び第４図に示したようになる。なお、第３図及び
第４図において、○、Δ及び・印は夫々酸として、塩酸
、硝酸及び王水を用いた場合を示す、第３図からｐＨの
値が高い程Ｓｍの回収率が向上することがわかる。一方
、第４図によると、回収Ｓｍ、ｏ、の純度はＤＨが低く
なる程高くなる。従って、高回収率と高純度の双方を満
足するｐＨの値の範囲は０．５〜２．０、好ましくは０
．８〜１．５である。Taking as an example the case where oxalic acid is added to a solution of an alloy dissolved in hydrochloric acid, the pH is adjusted and Sm is recovered as Sm,03, the relationship between the Sm recovery rate and p) (and The relationship between the purity and pH of recovered S10. From Figure 3, which shows the case of using hydrochloric acid, nitric acid, and aqua regia, it can be seen that the higher the pH value, the better the recovery rate of Sm is.On the other hand, according to Figure 4, the purity of recovered Sm,o, The lower the DH, the higher the pH value. Therefore, the pH value range that satisfies both high recovery rate and high purity is 0.5 to 2.0, preferably 0.
．． It is 8 to 1.5.
なお、このｐＨｍ整工程において使用するｐＨ調整剤と
しては、アンモニア水（Ｎ）１．．０）Ｉ） 、水酸化
ナトリウム（ＮａＯＨ）、炭酸ナトリウム（ＮａｚＣＯ
ｉ）などがあげられるが、特にＮＨ，ＯＨはＣｏ等の金
属と錯イオンを形成し易く、沈殿を生じにくいため好ま
しい。In addition, as a pH adjuster used in this pH adjustment process, ammonia water (N) 1. ．． 0)I), sodium hydroxide (NaOH), sodium carbonate (NazCO
i), etc., but NH and OH are particularly preferred because they easily form complex ions with metals such as Co and are less likely to cause precipitation.
また、上記においては、しゅう酸を添加したのちにｐＨ
ｍ整を行う場合について述べたが、ｐＨを予め調整した
のちにしゅう酸を添加して最終的なｐＨを０．５〜２．
０となるような工程によっても上記と同様な結果が得ら
れることが確認されている。第４図には、かかる工程に
より希土類元素を回収した場合のｐＨと純度との関係を
×印で示した。この図からも上記と同様な関係があるこ
とがわかる。In addition, in the above, after adding oxalic acid, the pH
As described above, the pH is adjusted in advance and then oxalic acid is added to adjust the final pH to 0.5 to 2.
It has been confirmed that the same results as above can be obtained by a process in which the value is 0. In FIG. 4, the relationship between pH and purity when rare earth elements are recovered through such a process is indicated by an x mark. This figure also shows the same relationship as above.
このようにして、析出したしゅう酸塩の沈殿をろ過した
のち、沈殿を結晶化して希土類元素のしゅう酸塩を得る
。なお、更に、このしゆう酸塩を熱分解して希土類の酸
化物として回収することもできる。After the oxalate precipitate thus precipitated is filtered, the precipitate is crystallized to obtain rare earth element oxalate. Furthermore, this oxalate salt can also be thermally decomposed and recovered as a rare earth oxide.
また、Ｎｄ−Ｆｅ−Ｂ系合金についても、上記したＳｍ
−Ｃｏ系合金と同様、溶解に使用する無機酸、しゅう酸
添加量、ｐＨと回収率及び純度とは、第１図乃至第４図
に示したような関係があることが確認されている。Also, regarding Nd-Fe-B alloys, the above-mentioned Sm
Similar to -Co alloys, it has been confirmed that there is a relationship between the inorganic acid used for dissolution, the amount of oxalic acid added, the pH, the recovery rate, and the purity as shown in FIGS. 1 to 4.
（実施例）
実施例１〜７、比較例１．２
第１表に示した組成を有するＳｍ−Ｃｏ系合金を出発物
質として、第２表に示した酸で熔解して不溶残渣をろ過
し、しゅう酸を添加したのち、アンモニア水で表示のｐ
Ｈに調整してＳｍのしゆう酸塩の分離回収を行い、さ
らに、このしゅう酸塩を熱分解して得られたＳｍ、Ｏ，
の回収率、純度及び残留不純物量を第２表中に示した。(Example) Examples 1 to 7, Comparative Example 1.2 Using an Sm-Co alloy having the composition shown in Table 1 as a starting material, it was melted with the acid shown in Table 2, and the insoluble residue was filtered. , After adding oxalic acid, add ammonia water to the indicated p.
The oxalate of Sm was separated and recovered by adjusting the temperature to
The recovery rate, purity and amount of residual impurities are shown in Table 2.
但し、実施例７のみはｐＨを調整後にしゅう酸を添加し
てしゅう酸塩を析出回収した。なお、回収率はＳｍに換
算した値を示した。However, only in Example 7, oxalic acid was added after adjusting the pH to precipitate and collect oxalate. Note that the recovery rate is a value converted to Sm.
実施例８〜１）、比較例３．４
第３表に示した組成を有するＮｄ−Ｆｅ−Ｂ系合金を出
発物質として、第４表に示した酸で溶解して不溶残渣を
ろ過し、しゅう酸を添加したのち、アンモニア水で表示
のｐＨに調整してＮｄのしゆう酸塩の分離回収を行い、
更に熱分解して得られたＮ ｄ 、Ｏ，の回収率、純度
及び残留不純物量を第４表中に示した。但し、実施例１
）のみはｐＨを調整後にしゅう酸を添加してしゅう酸塩
を析出回収した。なお、回収率はＮｄに換算した値を示
した。Examples 8 to 1), Comparative Example 3.4 Using an Nd-Fe-B alloy having the composition shown in Table 3 as a starting material, it was dissolved with the acid shown in Table 4, and the insoluble residue was filtered, After adding oxalic acid, the pH was adjusted to the indicated value with aqueous ammonia, and the oxalate of Nd was separated and recovered.
Furthermore, the recovery rate, purity, and amount of residual impurities of N d and O obtained by thermal decomposition are shown in Table 4. However, Example 1
), oxalic acid was added after adjusting the pH to precipitate and collect oxalate. Note that the recovery rate is a value converted to Nd.
（以下余白）
上記の第２表及び第４表からも明らかなように、本発明
の分離回収方法によるものは、回収率、純度共に極めて
良好であることが確認された。(The following is a blank space) As is clear from Tables 2 and 4 above, it was confirmed that the separation and recovery method of the present invention had extremely good recovery rates and purity.
（発明の効果）
以上説明したように本発明によれば、希土類元素を含存
する合金から希土元素を分離回収する方法において、前
記合金を無機酸に溶解して不溶残渣を除去したのち、得
られた溶液にしゅう酸を添加するとともに、ｐＨを０．
５〜２．０の範囲に調整して前記希土類元素をしゅう酸
塩として析出させることとしたので、回収率及び分離し
た希土類元素の純度が共に高く、工業的な規模で十分利
用することが可能である。従って、特に希土類磁石用合
金屑からの希土類元素の回収などに適用して極めて有用
である。(Effects of the Invention) As explained above, according to the present invention, in a method for separating and recovering rare earth elements from an alloy containing rare earth elements, after dissolving the alloy in an inorganic acid and removing insoluble residue, the obtained Add oxalic acid to the solution and adjust the pH to 0.
Since the rare earth elements are precipitated as oxalates by adjusting the concentration to a range of 5 to 2.0, both the recovery rate and the purity of the separated rare earth elements are high, and they can be fully utilized on an industrial scale. It is. Therefore, it is extremely useful especially when applied to the recovery of rare earth elements from alloy scraps for rare earth magnets.
第１図はＳｍ −Ｃｏ合金を各種酸で溶解したときの分
解残渣の割合を示す図、第２図はしゅう酸の添加量とＳ
ｍ回収率との関係を示す図、第３図はしゅう酸添加時の
］）ＨとＳｍ回収率との関係を示す図、第４図はしゅう
酸添加時のｐＨとＳｍ、Ｏ，の純度との関係を示す図で
ある。Figure 1 shows the proportion of decomposition residue when Sm-Co alloy is dissolved with various acids, and Figure 2 shows the amount of oxalic acid added and S
Figure 3 shows the relationship between H and Sm recovery rate when oxalic acid is added. Figure 4 shows the relationship between pH and Sm, O, purity when oxalic acid is added. FIG.
Claims (3)
収する方法において、前記合金を無機酸に溶解して不溶
残渣を除去したのち、得られた溶液にしゅう酸を添加す
るとともに、ｐＨを０．５〜２．０の範囲に調整して前
記希土類元素をしゅう酸塩として析出させることを特徴
とする希土類元素の分離回収方法。(1) In a method for separating and recovering rare earth elements from an alloy containing rare earth elements, the alloy is dissolved in an inorganic acid to remove insoluble residues, and then oxalic acid is added to the resulting solution, and the pH is adjusted. A method for separating and recovering rare earth elements, characterized in that the rare earth elements are adjusted to a range of 0.5 to 2.0 and precipitated as oxalate.
であることを特徴とする特許請求の範囲第１項記載の希
土類元素の分離回収方法。(2) The method for separating and recovering rare earth elements according to claim 1, wherein the inorganic acid is hydrochloric acid, nitric acid, or a mixed acid thereof.
ることを特徴とする特許請求の範囲第１項記載の希土類
元素の分離回収方法。(3) The method for separating and recovering rare earth elements according to claim 1, wherein aqueous ammonia is used in the step of adjusting the pH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008889A JPS63182216A (en) | 1987-01-20 | 1987-01-20 | Method for separation and recovery of rare earth element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008889A JPS63182216A (en) | 1987-01-20 | 1987-01-20 | Method for separation and recovery of rare earth element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63182216A true JPS63182216A (en) | 1988-07-27 |
Family
ID=11705241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62008889A Pending JPS63182216A (en) | 1987-01-20 | 1987-01-20 | Method for separation and recovery of rare earth element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63182216A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04164810A (en) * | 1990-10-26 | 1992-06-10 | Shin Etsu Chem Co Ltd | Production of rare earth element oxide |
| US5595714A (en) * | 1995-05-16 | 1997-01-21 | Dibra S.P.A. | Recovery of gadolinium and its complexing agents from aqueous solutions containing their complexes |
| US5961938A (en) * | 1996-02-13 | 1999-10-05 | Santoku Metal Industry Co., Ltd | Method for recovering reusable elements from rare earth-iron alloy |
| US5980841A (en) * | 1996-02-13 | 1999-11-09 | Santoku Metal Industry Co., Ltd. | Method for recovering reusable elements from rare earth-nickel alloy |
| WO2003104149A1 (en) * | 2002-06-07 | 2003-12-18 | Showa Denko K.K. | Process for recovering rare earth oxide from waste liquid containing rare earth element, and process for producing rare earth oxide using same |
| WO2007105714A1 (en) * | 2006-03-13 | 2007-09-20 | Showa Denko K.K. | Method of recovering rare earth element from composition containing rare earth fluoride |
| CN100402431C (en) * | 2002-06-07 | 2008-07-16 | 昭和电工株式会社 | Process for recovering rare earth oxide from waste liquid containing rare earth element, and process for producing rare earth oxide using same |
| WO2014144463A1 (en) * | 2013-03-15 | 2014-09-18 | The University Of Houston System | Methods and systems for recovering rare earth elements |
| CN108557864A (en) * | 2018-06-05 | 2018-09-21 | 常州市卓群纳米新材料有限公司 | A kind of D50:The preparation method and application of the samarium oxide of 7-10um |
-
1987
- 1987-01-20 JP JP62008889A patent/JPS63182216A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04164810A (en) * | 1990-10-26 | 1992-06-10 | Shin Etsu Chem Co Ltd | Production of rare earth element oxide |
| US5595714A (en) * | 1995-05-16 | 1997-01-21 | Dibra S.P.A. | Recovery of gadolinium and its complexing agents from aqueous solutions containing their complexes |
| US5961938A (en) * | 1996-02-13 | 1999-10-05 | Santoku Metal Industry Co., Ltd | Method for recovering reusable elements from rare earth-iron alloy |
| US5980841A (en) * | 1996-02-13 | 1999-11-09 | Santoku Metal Industry Co., Ltd. | Method for recovering reusable elements from rare earth-nickel alloy |
| WO2003104149A1 (en) * | 2002-06-07 | 2003-12-18 | Showa Denko K.K. | Process for recovering rare earth oxide from waste liquid containing rare earth element, and process for producing rare earth oxide using same |
| CN100402431C (en) * | 2002-06-07 | 2008-07-16 | 昭和电工株式会社 | Process for recovering rare earth oxide from waste liquid containing rare earth element, and process for producing rare earth oxide using same |
| WO2007105714A1 (en) * | 2006-03-13 | 2007-09-20 | Showa Denko K.K. | Method of recovering rare earth element from composition containing rare earth fluoride |
| WO2014144463A1 (en) * | 2013-03-15 | 2014-09-18 | The University Of Houston System | Methods and systems for recovering rare earth elements |
| US9376735B2 (en) | 2013-03-15 | 2016-06-28 | University Of Houston System | Methods and systems for recovering rare earth elements |
| CN108557864A (en) * | 2018-06-05 | 2018-09-21 | 常州市卓群纳米新材料有限公司 | A kind of D50:The preparation method and application of the samarium oxide of 7-10um |
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