JP3423910B2 - How to recover indium - Google Patents
How to recover indiumInfo
- Publication number
- JP3423910B2 JP3423910B2 JP2000017168A JP2000017168A JP3423910B2 JP 3423910 B2 JP3423910 B2 JP 3423910B2 JP 2000017168 A JP2000017168 A JP 2000017168A JP 2000017168 A JP2000017168 A JP 2000017168A JP 3423910 B2 JP3423910 B2 JP 3423910B2
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- indium
- electrolytic
- recovering
- electrolytic refining
- 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
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
- Electrolytic Production Of Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、電解精製後、電
解液中のメタスズ酸の懸濁物及び錫イオンを除去し、電
解液を再利用する電解精製によるインジウムの回収方法
に関する。TECHNICAL FIELD The present invention relates to a method for recovering indium by electrolytic refining in which a suspension of metastannic acid and tin ions in an electrolytic solution are removed after electrolytic refining and the electrolytic solution is reused.
【０００２】[0002]
【従来の技術】近年、酸化インジウム−酸化錫（ＩＴ
Ｏ）は液晶表示装置の透明導電性薄膜やガスセンサーな
どに広く使用されているが、多くの場合スパッタリング
法による薄膜形成手段を用いて基板等の上に薄膜が形成
されている。このスパッタリング法は薄膜形成手段とし
て優れた方法であるが、スパッタリングターゲットを用
いて、例えば透明導電性薄膜を製造する場合には、該タ
ーゲットの消耗が均一に消耗するわけではない。このタ
ーゲットの一部の特に消耗が激しい部分を一般にエロー
ジョン部と呼んでいるが、このエロージョン部の消耗が
進行し、ターゲットを支持するバッキングプレートが剥
き出しになる直前までスパッタリング操作を続行する
が、その後は新らしいターゲットと交換している。した
がって、使用済みのスパッタリングターゲットには多く
の非エロージョン部、すなわち未使用のターゲット部分
が残存することになり、これらは全てスクラップとな
る。2. Description of the Related Art In recent years, indium oxide-tin oxide (IT
O) is widely used for a transparent conductive thin film of a liquid crystal display device, a gas sensor and the like, but in many cases, a thin film is formed on a substrate or the like by using a thin film forming means by a sputtering method. This sputtering method is an excellent method for forming a thin film, but when a transparent conductive thin film is produced using a sputtering target, the target is not consumed uniformly. The part of this target that is particularly worn is generally called the erosion part.The wear of this erosion part progresses and the sputtering operation is continued until just before the backing plate supporting the target is exposed, but after that, Is trading for a new target. Therefore, many non-erosion parts, that is, unused target parts, remain in the used sputtering target, and they are all scrap.
【０００３】酸化インジウム−酸化錫（ＩＴＯ）材料に
は高純度材が使用されており、価格も高いので、一般に
このスクラップ材からインジウムを回収することが行わ
れている。このインジウム回収方法として、従来酸溶解
法、イオン交換法、溶媒抽出法などの湿式精製を組み合
わせた方法が用いられている。例えば、ＩＴＯスクラッ
プを洗浄及び粉砕後、硝酸に溶解し、溶解液に硫化水素
を通して、錫、鉛、銅などの不純物を硫化物として沈殿
除去した後、これにアンモニアを加えて中和し、水酸化
インジウムとして回収する方法である。しかし、この方
法によって得られた水酸化インジウムはろ過性が悪く操
作に長時間を要し、Ｓｉ、Ａｌ等の不純物が多く、また
生成する水酸化インジウムはその中和条件及び熟成条件
等により、粒径や粒度分布が変動するため、その後ＩＴ
Ｏターゲットを製造する際に、ＩＴＯターゲットの特性
を安定して維持できないという問題があった。Since a high-purity material is used for the indium oxide-tin oxide (ITO) material and its price is high, indium is generally recovered from this scrap material. As a method for recovering this indium, a method combining wet purification such as an acid dissolution method, an ion exchange method and a solvent extraction method has been conventionally used. For example, after cleaning and crushing ITO scrap, it is dissolved in nitric acid, hydrogen sulfide is passed through the solution to precipitate and remove impurities such as tin, lead, and copper as sulfides, and then ammonia is added to neutralize the solution. This is a method of recovering as indium oxide. However, the indium hydroxide obtained by this method is poor in filterability, requires a long time for operation, contains many impurities such as Si and Al, and the produced indium hydroxide may have a neutralization condition and an aging condition. Since the particle size and particle size distribution fluctuate, IT
There is a problem that the characteristics of the ITO target cannot be stably maintained when the O target is manufactured.
【０００４】このようなことから、本発明者は先に、Ｉ
ＴＯスクラップ等の酸化インジウムを含有する物質を、
予め７５０〜１２００°Ｃで還元性ガスにより還元して
金属インジウムとした後、該インジウムを電解精製する
インジウムの回収方法を提案した（特開平７−１４５４
３２号公報）。これによれば、高純度のインジウムを効
率良く安定して回収することが可能となった。しかし、
電解精製で特に問題となるのは、電解精製の進行ととも
に、電解液中にメタスズ酸や錫イオンが蓄積してくるこ
とである。ＩＴＯスクラップでは錫の混入は避けられな
い問題である。電解装置内のアノードとカソードの間に
隔膜を設けて、錫を含有するスライムの析出物への混入
を避ける方法が採られているが、メタスズ酸や錫イオン
が増加するにつれ、電解精製能力は急速に低下してく
る。したがって、このメタスズ酸や錫イオンを除去する
ことが必要であるが、従来簡便にかつ効率よく除去でき
る方法がなかった。From the above, the present inventor first
A material containing indium oxide, such as TO scrap,
A method for recovering indium has been proposed in which metal indium is reduced in advance by a reducing gas at 750 to 1200 ° C., and then the indium is electrolytically refined (JP-A-7-1454).
No. 32). According to this, it became possible to collect highly pure indium efficiently and stably. But,
A particular problem in electrolytic refining is that metastannic acid and tin ions accumulate in the electrolytic solution as electrolytic refining progresses. Mixing tin is an unavoidable problem in ITO scrap. A method has been adopted in which a diaphragm is provided between the anode and the cathode in the electrolysis device to prevent the inclusion of tin-containing slime in the precipitate, but as the metastannic acid and tin ions increase, the electrorefining capacity increases. It drops rapidly. Therefore, it is necessary to remove the metastannic acid and tin ions, but there has been no conventional method that can remove them easily and efficiently.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記の問題
を解決するために、電解精製後、電解液中のメタスズ酸
の懸濁物及び錫イオンを簡便にかつ効率良く除去して電
解液を再利用し、電解精製によるインジウムを効率良く
回収する方法を提供することにある。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method for electrolytically purifying an electrolytic solution by simply and efficiently removing a suspension of metastannic acid and tin ions in the electrolytic solution. Another object of the present invention is to provide a method for efficiently recovering indium by electrolytically refining it.
【０００６】[0006]
【課題を解決するための手段】本発明は、
１ 硫酸インジウム又は塩化インジウム水溶液を用いる
インジウムの電解精製において、電解液を活性炭処理す
ることにより、電解液中のメタスズ酸の懸濁物及び錫イ
オンを除去することを特徴とする電解精製によるインジ
ウムの回収方法
２ 電解精製液中に活性炭を２０〜２００ｇ／Ｌ添加す
ることを特徴とする上記１に記載する電解精製によるイ
ンジウムの回収方法
３ 電解精製液中に活性炭を５０〜１００ｇ／Ｌ添加す
ることを特徴とする上記１に記載する電解精製によるイ
ンジウムの回収方法
４ 回転数４００ｒｐｍ以上で、５分以上撹拌すること
を特徴とする上記１〜３のそれぞれに記載する電解精製
によるインジウムの回収方法
５ 活性炭の細孔径が３０Å以下であることを特徴とす
る上記１〜４のそれぞれに記載する電解精製によるイン
ジウムの回収方法
６ 活性炭の細孔径が２０Å以下であることを特徴とす
る上記１〜４のそれぞれに記載する電解精製によるイン
ジウムの回収方法
７ 活性炭の粒径が２５０メッシュ以下であることを特
徴とする上記１〜６のそれぞれに記載する電解精製によ
るインジウムの回収方法
８ 活性炭の比表面積が１０５０ｍ２／ｇ以上であるこ
とを特徴とする上記１〜７のそれぞれに記載する電解精
製によるインジウムの回収方法、を提供する。According to the present invention, in electrolytic purification of indium using an indium sulfate or indium chloride aqueous solution, a suspension of metastannic acid and tin ions in the electrolytic solution are obtained by treating the electrolytic solution with activated carbon. Method 2 for recovering indium by electrolytic refining, characterized in that the activated carbon is added to the electrolytically refined solution in an amount of 20 to 200 g / L. Activated carbon is added to the liquid in an amount of 50 to 100 g / L, and the method for recovering indium by electrolytic refining according to the above item 1, 4 is stirred at 400 rpm or more for 5 minutes or more. Method of recovering indium by electrolytic refining described in each of 5 above, wherein the activated carbon has a pore diameter of 30 Å or less. Method 4 for recovering indium by electrolytic refining described in each of 4 above. Method for recovering indium by electrolytic refining according to each of the above 1 to 4, characterized in that the pore diameter of activated carbon is 20 Å or less. Method of recovering indium by electrolytic refining according to each of the above 1 to 6, characterized in that it is 250 mesh or less Each of the above 1 to 7, characterized in that the specific surface area of activated carbon is 1050 m 2 / g or more And a method for recovering indium by electrolytic refining according to 1.
【０００７】[0007]
【発明の実施の形態】一般に、電解精製後液は錫イオン
として１０００〜２０００ｍｇ／Ｌ（Ｌは電解液量）、
固形物として２０００〜１００００ｍｇ／Ｌ含まれる。
本発明は、硫酸インジウム又は塩化インジウム水溶液を
用いるインジウムの電解精製において、電解液を活性炭
処理することにより、電解液中に懸濁するメタスズ酸だ
けでなく錫イオンを活性炭に吸着させ、これをろ過して
効果的にメタスズ酸及び錫イオン除去することが可能と
なった。ろ過後の電解液は再利用することができる。活
性炭は電解精製後、該電解精製液中に２０〜２００ｇ／
Ｌ（電解液）添加する。２０ｇ／Ｌ未満では吸着して除
去できる効果が殆どなく、また２００ｇ／Ｌを超えると
除去能が飽和し、処理量が増えるだけで活性炭が無駄と
なる。より好ましい範囲は、添加量５０〜１００ｇ／Ｌ
である。BEST MODE FOR CARRYING OUT THE INVENTION Generally, a solution after electrolytic purification is 1000 to 2000 mg / L as tin ions (L is the amount of the electrolytic solution),
2000 to 10000 mg / L is contained as a solid.
The present invention, in the electrolytic purification of indium using indium sulfate or indium chloride aqueous solution, by treating the electrolytic solution with activated carbon, not only metastannic acid suspended in the electrolytic solution but also tin ions are adsorbed on the activated carbon, and this is filtered. As a result, metastannic acid and tin ions can be effectively removed. The electrolytic solution after filtration can be reused. Activated carbon, after electrolytic purification, is added to the electrolytically refined liquid in an amount of 20 to 200 g /
Add L (electrolyte). If it is less than 20 g / L, there is almost no effect that it can be adsorbed and removed, and if it exceeds 200 g / L, the removal ability is saturated and the treatment amount is increased, and the activated carbon is wasted. A more preferable range is an addition amount of 50 to 100 g / L.
Is.
【０００８】電解液中の上記塩素イオン源として、塩酸
又は塩化ナトリウム、塩化カリウム等のアルカリ金属塩
化物が使用されるが、前記活性炭による電解液の再生は
いずれの場合にも適応できる。一般に、酸化インジウム
−酸化錫（ＩＴＯスクラップ）等の酸化インジウムを含
有する物質については、これを予め還元して金属インジ
ウムとした後、電解精製が行なわれる。前記活性炭を添
加した後、回転数４００ｒｐｍ以上で、５分以上撹拌す
る。処理の温度は常温で良く、加熱や冷却は不要であ
る。なお、低温では電解液成分が析出する場合もあるの
で、むしろ必要以上の低温は好ましくない。上記のよう
に、回転数は４００ｒｐｍ以上と大きい方が望ましい。
撹拌の時間の増加により、錫の濃度は低下する。６０分
以上で殆ど吸着は完了する。Hydrochloric acid or an alkali metal chloride such as sodium chloride or potassium chloride is used as the chlorine ion source in the electrolytic solution, but regeneration of the electrolytic solution by the activated carbon can be applied in any case. In general, a substance containing indium oxide such as indium oxide-tin oxide (ITO scrap) is reduced in advance to metallic indium and then electrolytically refined. After adding the activated carbon, the mixture is stirred at a rotation speed of 400 rpm or more for 5 minutes or more. The treatment temperature may be room temperature, and heating or cooling is unnecessary. It should be noted that an electrolyte component may be precipitated at a low temperature, so a temperature higher than necessary is not preferable. As described above, it is desirable that the number of revolutions is as large as 400 rpm or more.
As the stirring time increases, the tin concentration decreases. Most of the adsorption is completed in 60 minutes or more.
【０００９】活性炭の細孔径は、３０Å以下であること
が望ましい。特に活性炭の細孔径が２０Å以下である
と、錫の吸着が効果的に行われる。さらに、活性炭の粒
径が２５０メッシュ以下であり、かつ活性炭の比表面積
が１０５０ｍ２／ｇ以上であることが望ましい。いずれ
の場合も吸着がより効果的に実施できる。このように、
活性炭を電解後液に入れて錫イオン及びメタスズ酸を吸
着除去した後、該電解液を再利用する。後述する実施例
に示すように、この活性炭処理により、回収するための
インジウムや電解液成分が影響を受けることがなく、錫
イオン及びメタスズ酸のみが選択的に除去できる。The pore size of activated carbon is preferably 30 Å or less. In particular, when the activated carbon has a pore diameter of 20 Å or less, the adsorption of tin is effectively performed. Further, it is desirable that the particle size of the activated carbon be 250 mesh or less and the specific surface area of the activated carbon be 1050 m 2 / g or more. In either case, adsorption can be carried out more effectively. in this way,
Activated carbon is put into the post-electrolysis solution to adsorb and remove tin ions and metastannic acid, and then the electrolysis solution is reused. As shown in Examples described later, this activated carbon treatment can selectively remove only tin ions and metastannic acid without affecting the indium and electrolytic solution components for recovery.
【００１０】[0010]
【実施例】次に、実施例について説明する。なお、本実
施例は発明の一例を示すためのものであり、本発明はこ
れらの実施例に制限されるものではない。すなわち、本
発明の技術思想に含まれる他の態様及び変形を含むもの
である。電解精製の試料として、酸化インジウム−酸化
錫（ＩＴＯスクラップ）を使用し、この材料を予め１０
００°Ｃで水素ガスを流し、還元したものである。この
材料の中には、不純物として錫１２％、Ｆｅ１９ｐｐ
ｍ、酸素１ｐｐｍ含有した。この試料を使用し、電解液
及び条件を、インジウム濃度５５ｇ／Ｌ、ＰＨ１．５〜
２．５、電流密度０．６〜０．６３Ａ／ｄｍ２、液温２
５〜４０°Ｃ、塩素イオン量２４〜５１ｇ／Ｌ、にかわ
０〜４ｍｇ／Ｌ、極間を４０〜６０ｍｍに調整して、電
解精製したものである。この結果、錫（イオン）濃度は
１１００ｍｇ／Ｌであった。この電解精製した後液に活
性炭を５〜１００ｇ／Ｌ添加し、錫（イオン）濃度を調
べた。この結果を表１に示す。なお、この場合に使用し
た活性炭の細孔径１６Å、粒径２５０メッシュ以下、比
表面積１０５０ｍ２／ｇのものを使用し、撹拌時間６０
分、回転数４００ｒｐｍで処理した。EXAMPLES Next, examples will be described. It should be noted that the present embodiment is merely an example of the invention, and the present invention is not limited to these embodiments. That is, it includes other aspects and modifications included in the technical idea of the present invention. As a sample for electrolytic refining, indium oxide-tin oxide (ITO scrap) was used.
The hydrogen gas was reduced by flowing hydrogen gas at 00 ° C. Among these materials, as impurities 12% tin, Fe19pp
m, containing 1 ppm of oxygen. Using this sample, the electrolytic solution and conditions were set to an indium concentration of 55 g / L, a pH of 1.5 to
2.5, current density 0.6 to 0.63 A / dm 2 , liquid temperature 2
The electrolytic purification was performed at 5 to 40 ° C., chlorine ion amount of 24 to 51 g / L, glue 0 to 4 mg / L, and gap between 40 to 60 mm. As a result, the tin (ion) concentration was 1100 mg / L. After the electrolytic purification, 5 to 100 g / L of activated carbon was added to the liquid, and the tin (ion) concentration was examined. The results are shown in Table 1. The activated carbon used in this case had a pore size of 16Å, a particle size of 250 mesh or less, and a specific surface area of 1050 m 2 / g.
Min., The rotation speed was 400 rpm.
【００１１】[0011]
【表１】 [Table 1]
【００１２】表１から明らかなように、無添加のときＳ
ｎ濃度１１００ｍｇ／Ｌであったが、活性炭５ｇ／Ｌの
場合にＳｎ濃度が３６０ｍｇ／Ｌに減少し、活性炭１０
ｇ／Ｌの添加で１８４ｍｇ／Ｌ、活性炭２０ｇ／Ｌの添
加で８４ｍｇ／Ｌ、活性炭５０ｇ／Ｌの添加で３８ｍｇ
／Ｌ、活性炭１００ｇ／Ｌの添加で１５ｍｇ／Ｌに減少
した。電解液中に錫の沈殿物は約２０００〜１００００
ｍｇ／Ｌ存在したが、活性炭１００ｇ／Ｌの添加の場合
には、これらも同時に殆ど除去された。活性炭２０ｇ／
Ｌの添加で１／１０以下に減少することが分かる。以上
から活性炭は多いほど良いが、その効果が飽和し活性炭
の処理量が多くなるだけなので、２００ｇ／Ｌ以下の添
加で十分である。以上から活性炭の添加は、電解液中の
Ｓｎの吸着除去に極めて有効であることが分かる。As is clear from Table 1, when no addition is made, S
The n concentration was 1100 mg / L, but when the activated carbon was 5 g / L, the Sn concentration decreased to 360 mg / L, and the activated carbon 10
184 mg / L with addition of g / L, 84 mg / L with addition of activated carbon 20 g / L, 38 mg with addition of activated carbon 50 g / L
/ L and activated carbon 100 g / L were added to reduce the amount to 15 mg / L. Precipitation of tin in the electrolyte is about 2000-10000
There was mg / L, but when 100 g / L of activated carbon was added, these were almost removed at the same time. Activated carbon 20g /
It can be seen that the addition of L reduces it to 1/10 or less. From the above, the more activated carbon the better, but the effect is saturated and the treated amount of activated carbon only increases, so addition of 200 g / L or less is sufficient. From the above, it is understood that the addition of activated carbon is extremely effective in the adsorption removal of Sn in the electrolytic solution.
【００１３】次に、撹拌の時間を変えその影響を調べ
た。活性炭の添加量は１００ｇ／Ｌとした。電解液中の
Ｓｎ濃度は３３０ｍｇ／Ｌであり、他は上記と同様であ
る。この結果を表２に示す。表２に示す通り、無撹拌の
場合にＳｎ濃度は３３０ｍｇ／Ｌであったが、３０分の
撹拌でＳｎ濃度が４５ｍｇ／Ｌとなり、６０分以降は１
ｍｇ／Ｌ以下となった。このように、撹拌の効果は非常
に大きい。実験によれば、５分以上の撹拌でその効果が
現れた。Next, the influence of stirring was examined by changing the stirring time. The amount of activated carbon added was 100 g / L. The Sn concentration in the electrolytic solution is 330 mg / L, and the others are the same as above. The results are shown in Table 2. As shown in Table 2, the Sn concentration was 330 mg / L without stirring, but the Sn concentration was 45 mg / L after stirring for 30 minutes, and the Sn concentration was 1 after 60 minutes.
It became less than mg / L. Thus, the effect of stirring is very large. According to the experiment, the effect was exhibited by stirring for 5 minutes or more.
【００１４】[0014]
【表２】 [Table 2]
【００１５】次に、活性炭の細孔径の影響を調べた。そ
の結果を表３に示す。処理前のＳｎ濃度は１１００ｍｇ
／Ｌであり、Ｉｎ濃度は４７．６ｇ／Ｌ、ＳＯ４ ２−濃
度は６０ｇ／Ｌ、Ｎａ＋濃度は１８．７ｇ／Ｌ、Ｃｌ−
濃度は２９．０ｇ／Ｌである。活性炭の添加量は１００
ｇ／Ｌであり、該活性炭の粒径は２００メッシュ以下、
比表面積１４３０ｍ２／ｇのものを使用し、撹拌時間６
０分、回転数４００ｒｐｍで処理した。活性炭の細孔径
は１６Åと３０Åの２種類を使用した。この結果を表３
に示す。この表３に示す通り、活性炭の細孔径が３０Å
に比べ、活性炭の細孔径は１６Åの方がＳｎイオンの吸
着が著しいことが分かる。活性炭の細孔径が３０Åでも
Ｓｎイオンの十分な吸着効果を示すが、より効率のよい
吸着効果を期待するとすれば、活性炭の細孔径が２０Å
以下であることが望ましい。なお、この表から明らかな
ように、Ｉｎ、ＳＯ４ ２−、Ｎａ＋、Ｃｌ−には殆ど影
響がなく、Ｓｎイオンのみが選択的に吸着除去されてい
ることが分かる。Next, the influence of the pore size of activated carbon was investigated. The results are shown in Table 3. Sn concentration before treatment is 1100 mg
/ L, In concentration is 47.6 g / L, SO 4 2− concentration is 60 g / L, Na + concentration is 18.7 g / L, Cl −.
The concentration is 29.0 g / L. The amount of activated carbon added is 100
g / L, the particle size of the activated carbon is 200 mesh or less,
Use with a specific surface area of 1430 m 2 / g, stirring time 6
Processing was carried out for 0 minutes at a rotation speed of 400 rpm. The activated carbon used had two pore sizes of 16Å and 30Å. The results are shown in Table 3.
Shown in. As shown in Table 3, the activated carbon has a pore size of 30Å
Compared with the above, it can be seen that the adsorption of Sn ions is more remarkable when the pore size of activated carbon is 16Å. Even if the activated carbon has a pore size of 30Å, it exhibits a sufficient Sn ion adsorption effect, but if a more efficient adsorption effect is expected, the activated carbon has a pore size of 20Å.
The following is desirable. As is clear from this table, In, SO 4 2− , Na + , and Cl − are hardly affected, and only Sn ions are selectively adsorbed and removed.
【００１６】[0016]
【表３】 [Table 3]
【００１７】[0017]
【発明の効果】本発明は、硫酸インジウム又は塩化イン
ジウム水溶液を用いるインジウムの電解精製において、
電解液後液を活性炭処理することにより、電解液中のメ
タスズ酸の懸濁物及び錫イオンを簡便にかつ効率良く除
去し、該電解液を再利用することにより電解精製による
インジウムを効率良く回収することができる優れた効果
を有する。INDUSTRIAL APPLICABILITY The present invention provides electrolytic purification of indium using indium sulfate or indium chloride aqueous solution.
By treating the post-electrolyte solution with activated carbon, the suspension of metastannic acid and tin ions in the electrolyte solution can be removed easily and efficiently, and by reuse of the electrolyte solution, indium can be efficiently recovered by electrolytic refining. It has an excellent effect that can be.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中島 光一 茨城県北茨城市華川町臼場187番地４ 株式会社日鉱マテリアルズ磯原工場内 (56)参考文献 特開 平10−204673（ＪＰ，Ａ) 特開 平１−270511（ＪＰ，Ａ) 特開 平１−270513（ＪＰ，Ａ) 特開 平７−145432（ＪＰ，Ａ) 特開2000−169991（ＪＰ，Ａ) 特公 昭38−12806（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) C25C 1/22 C22B 58/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Nakajima 187 Usuba, Hwagawa Town, Kitaibaraki City, Ibaraki Prefecture 4 Nikko Materials Co., Ltd. Isohara Plant (56) Reference JP-A-10-204673 (JP, A) JP-A-1-270511 (JP, A) JP-A-1-270513 (JP, A) JP-A-7-145432 (JP, A) JP-A-2000-169991 (JP, A) JP-B-38-12806 ( JP, B1) (58) Fields surveyed (Int.Cl. 7 , DB name) C25C 1/22 C22B 58/00
Claims (8)
液を用いるインジウムの電解精製において、電解液を活
性炭処理することにより、電解液中のメタスズ酸の懸濁
物及び錫イオンを除去することを特徴とする電解精製に
よるインジウムの回収方法。1. Electrolytic purification of indium using an aqueous solution of indium sulfate or indium chloride, characterized in that a suspension of metastannic acid and tin ions in the electrolytic solution are removed by treating the electrolytic solution with activated carbon. Method of recovering indium by purification.
／Ｌ添加することを特徴とする請求項１に記載する電解
精製によるインジウムの回収方法。2. Activated carbon in an electrolytically refined liquid is 20 to 200 g.
/ L is added, The method for recovering indium by electrolytic refining according to claim 1, characterized in that.
／Ｌ添加することを特徴とする請求項１に記載する電解
精製によるインジウムの回収方法。3. 50 to 100 g of activated carbon in the electrolytically refined liquid
/ L is added, The method for recovering indium by electrolytic refining according to claim 1, characterized in that.
拌することを特徴とする請求項１〜３のそれぞれに記載
する電解精製によるインジウムの回収方法。4. The method for recovering indium by electrolytic refining according to each of claims 1 to 3, wherein the rotation speed is 400 rpm or more and stirring is performed for 5 minutes or more.
を特徴とする請求項１〜４のそれぞれに記載する電解精
製によるインジウムの回収方法。5. The method for recovering indium by electrolytic refining according to each of claims 1 to 4, wherein the activated carbon has a pore size of 30 Å or less.
を特徴とする請求項１〜４のそれぞれに記載する電解精
製によるインジウムの回収方法。6. The method for recovering indium by electrolytic refining according to each of claims 1 to 4, wherein the activated carbon has a pore size of 20 Å or less.
ることを特徴とする請求項１〜６のそれぞれに記載する
電解精製によるインジウムの回収方法。7. The method for recovering indium by electrolytic refining according to claim 1, wherein the activated carbon has a particle size of 250 mesh or less.
上であることを特徴とする請求項１〜７のそれぞれに記
載する電解精製によるインジウムの回収方法。8. The method for recovering indium by electrolytic refining according to each of claims 1 to 7, wherein the specific surface area of activated carbon is 1050 m 2 / g or more.
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