JP2007056366A - Method for recovering indium from blast particle - Google Patents
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- JP2007056366A JP2007056366A JP2006204528A JP2006204528A JP2007056366A JP 2007056366 A JP2007056366 A JP 2007056366A JP 2006204528 A JP2006204528 A JP 2006204528A JP 2006204528 A JP2006204528 A JP 2006204528A JP 2007056366 A JP2007056366 A JP 2007056366A
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Abstract
Description
本発明は、ブラスト粒子からインジウムを回収する方法に関し、より詳しくは、ＩＴＯ膜洗浄などに用いたブラスト粒子からインジウムをアルミニウム等と分離して効率よく回収することができるインジウムの回収方法に関する。 The present invention relates to a method for recovering indium from blast particles, and more particularly to a method for recovering indium that can be efficiently recovered by separating indium from aluminum or the like from blast particles used for ITO film cleaning or the like.
ＩＴＯスパッタリングを行った後は、使用した装置や周囲に付着したＩＴＯ膜を除去するために、暫々、ブラスト処理がなされる。このＩＴＯ膜除去に使用したブラスト粒子にはＩＴＯ成分のインジウムやスズが付着しており、とくにインジウムは一般的な金属に比べて高価であるので、できるだけ回収して再利用することが求められる。 After ITO sputtering is performed, blasting is performed for a while in order to remove the ITO film attached to the used apparatus and the surroundings. The blast particles used for the removal of the ITO film have ITO components indium and tin attached thereto. In particular, since indium is more expensive than general metals, it is required to collect and reuse it as much as possible.
従来、ＩＴＯスクラップからインジウムを回収する技術が知られている。例えば、ＩＴＯスクラップ等を硝酸に混合して、酸化インジウムを溶解させる一方、硝酸に不溶性の酸化スズを溶解残として分離する方法であり、スズを分離した後は、インジウム硝酸溶解液を陽イオン交換型の抽出溶媒に接触させてインジウムを抽出する方法（特許文献１）や、インジウム硝酸溶解液に硫化水素を通して、亜鉛、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が知られている。 Conventionally, a technique for recovering indium from ITO scrap is known. For example, ITO scrap is mixed with nitric acid to dissolve indium oxide, while insoluble nitric oxide in nitric acid is separated as a residual residue. After the tin is separated, the indium nitric acid solution is subjected to cation exchange. A method of extracting indium by bringing it into contact with an extraction solvent of a mold (Patent Document 1), or by passing hydrogen sulfide through an indium nitrate solution to precipitate and remove impurities such as zinc, tin, lead, and copper as sulfides. A method of adding ammonia to neutralize and recover as indium hydroxide is known.
しかし、ＩＴＯスクラップを硝酸に溶解させて、スズを不溶性のメタスズ酸として分離する方法は、スズと共にニッケル等が共存している場合にはニッケルの分離が問題になる。また、有機抽出溶媒を用いてインジウムを抽出する方法はコストが嵩み、共存する他の金属イオンの存在によって抽出効果が影響を受けるなどの問題がある。さらに、インジウム硝酸溶解液からインジウムを水酸化沈澱にして分離回収する方法は亜鉛や錫の分離性が良くない。 However, in the method of dissolving ITO scrap in nitric acid and separating tin as insoluble metastannic acid, separation of nickel becomes a problem when nickel or the like coexists with tin. In addition, the method of extracting indium using an organic extraction solvent has a problem that the cost is high and the extraction effect is affected by the presence of other coexisting metal ions. Furthermore, the method of separating and recovering indium from the indium nitric acid solution by hydroxide precipitation does not provide good separation of zinc and tin.
一方、ＩＴＯスクラップを塩酸に溶解させ、この溶解液に水酸化ナトリウムを添加して水酸化スズ沈澱を生成させ、これを濾過してインジウムと分離する方法も知られている（特許文献２、３）。しかし、この方法は水酸化スズの濾過性が良くないので分離操作に時間がかかる。また、水酸化スズの含水量が多くインジウムが付着水分とともにロスすると云う問題がある。 On the other hand, a method is also known in which ITO scrap is dissolved in hydrochloric acid, sodium hydroxide is added to the solution to form a tin hydroxide precipitate, which is filtered and separated from indium (Patent Documents 2 and 3). ). However, this method takes time for the separation operation because the filterability of tin hydroxide is not good. Further, there is a problem that the water content of tin hydroxide is large and indium is lost along with the attached moisture.
さらに、従来の上記回収方法は何れもＩＴＯスラップからインジウムを回収する方法であり、使用済みブラスト粒子からインジウムを回収するものではない。ブラスト粒子はアルミナやシリカを主成分としており、これらを効率よくインジウムと分離する必要がある。
本発明は、従来の方法における上記問題を解決したものであり、使用済みブラスト粒子からインジウムを効率よく回収する方法を提供するものであり、本発明によれば、ブラスト粒子の主成分であるアルミナやシリカを効率よくインジウムと分離し、インジウムと共に含まれるスズやニッケルに対して分離性良く、容易に金属インジウムを回収することができる。 The present invention solves the above-described problems in the conventional method, and provides a method for efficiently recovering indium from used blast particles. According to the present invention, alumina as a main component of blast particles is provided. And silica can be efficiently separated from indium, and metal indium can be easily recovered with good separability with respect to tin and nickel contained together with indium.
本発明によれば以下のインジウム回収方法が提供される。
（１）インジウムを含有するブラスト粒子を塩酸および/または硫酸に溶解してインジウムを浸出させ（溶解工程）、次いでブラスト粒子の主成分であるアルミナおよび/またはシリカを溶解残渣として濾過分離し（濾過工程）、この濾液にインジウムよりも卑な金属を添加して液中のインジウムを還元析出させ（インジウム還元析出工程）、スポンジ状の金属インジウムを回収することを特徴とするブラスト粒子からインジウムを回収する方法。
（２）上記(１)の方法において、インジウムを含有するブラスト粒子がＩＴＯ膜除去に用いたブラスト粒子であり、これを塩酸および/または硫酸に溶解してインジウムを浸出させ（溶解工程）、次いで溶解残渣を濾過分離し（濾過工程）、さらにこの濾液に亜鉛粉末またはインジウムを添加してスズを還元析出させて濾過分離し（脱スズ工程）、この脱スズ濾液にさらに亜鉛を添加してインジウムを還元析出させ（インジウム還元析出工程）、スポンジ状の金属インジウムを回収する方法。
（３）上記(２)の方法において、インジウムと共にスズおよびニッケルを含有するブラスト粒子を塩酸および/または硫酸に溶解してインジウムを浸出させ（濾過工程）、次いで溶解残渣を濾過分離し（濾過工程）、この濾液に亜鉛粉末またはインジウムを添加してスズおよびニッケルを還元析出させて濾過分離し（脱スズ工程）、この濾液にさらに脱ニッケル剤を添加してニッケル含有澱物を生成させて濾過分離し（脱ニッケル工程）、この濾液に亜鉛を添加してインジウムを還元析出させ（インジウム還元析出工程）、スポンジ状の金属インジウムを回収する方法。
According to the present invention, the following indium recovery method is provided.
(1) Indium-containing blast particles are dissolved in hydrochloric acid and / or sulfuric acid to leach indium (dissolution step), and then alumina and / or silica, which are the main components of the blast particles, are filtered and separated as a dissolution residue (filtering) Process), adding inferior metal to indium to the filtrate to reduce and deposit indium in the liquid (indium reduction deposition process), and recover indium from blast particles characterized by recovering sponge-like metal indium how to.
(2) In the method of (1), the blast particles containing indium are the blast particles used for removing the ITO film, and this is dissolved in hydrochloric acid and / or sulfuric acid to leach indium (dissolution step), The dissolved residue is separated by filtration (filtering step), and zinc powder or indium is added to the filtrate to reduce and precipitate tin (filtering step). Then, zinc is further added to the tin-free filtrate to add indium. A method for recovering sponge metal indium by reducing and precipitating (indium reduction deposition step).
(3) In the above method (2), blast particles containing tin and nickel together with indium are dissolved in hydrochloric acid and / or sulfuric acid to leach indium (filtering step), and then the dissolved residue is separated by filtration (filtering step) ), Zinc powder or indium is added to the filtrate to reduce and precipitate tin and nickel, and then filtered and separated (tin removal process), and a nickel-containing starch is produced by adding a nickel removal agent to the filtrate and filtered. Separating (nickel removal step), adding zinc to the filtrate to reduce and deposit indium (indium reduction deposition step), and recovering sponge-like metal indium.
本発明の回収方法は、インジウム含有ブラスト粒子を塩酸または硫酸またはこれらの混酸に溶解し、ブラスト粒子の主成分であるアルミナやシリカを溶解残渣として最初に分離するので、効率よくインジウムを回収することができる。 In the recovery method of the present invention, indium-containing blast particles are dissolved in hydrochloric acid or sulfuric acid or a mixed acid thereof, and alumina or silica, which is the main component of the blast particles, is first separated as a dissolved residue, so that indium can be efficiently recovered. Can do.
また、本発明の回収方法は、インジウムとスズの分離性が良く、スズと共にニッケルが共存する場合でも、スズと共にニッケルを一緒に沈澱化して分離するので、ブラスト粒子から容易にインジウムを回収することができる。さらに、本発明の方法はスポンジ状の金属インジウムを回収するので、回収工程が簡単であり、低コストでインジウムを回収することができる。 In addition, the recovery method of the present invention has good separability between indium and tin, and even when nickel coexists with tin, nickel is precipitated together with tin and separated, so that indium can be easily recovered from blast particles. Can do. Furthermore, since the method of the present invention recovers spongy metallic indium, the recovery process is simple and indium can be recovered at low cost.
本発明のインジウム回収方法は、インジウムを含有するブラスト粒子を塩酸および/または硫酸に溶解してインジウムを浸出させ（溶解工程）、次いでブラスト粒子の主成分であるアルミナおよび/またはシリカを溶解残渣として濾過分離し（濾過工程）、この濾液にインジウムよりも卑な金属を添加して液中のインジウムを還元析出させ（インジウム還元析出工程）、スポンジ状の金属インジウムを回収することを特徴とするブラスト粒子からインジウムを回収する方法である。本発明のインジウム回収方法を図１に示す。 In the method for recovering indium according to the present invention, blast particles containing indium are dissolved in hydrochloric acid and / or sulfuric acid to leach indium (dissolution step), and then alumina and / or silica which are the main components of the blast particles are used as dissolution residues. Blasting characterized by filtering and separating (filtering step), adding a base metal lower than indium to the filtrate to reduce and deposit indium in the solution (indium reducing and depositing step), and recovering sponge-like metal indium This is a method for recovering indium from particles. The indium recovery method of the present invention is shown in FIG.
本発明の回収方法において、インジウムを含有するブラスト粒子とは、例えばＩＴＯ膜除去に用いたブラスト粒子である。このブラスト粒子にはＩＴＯ膜成分のインジウムおよびスズが付着しており、またスパッタ装置の構成部品である鋼材成分の鉄、ニッケル、クロムなどが付着している場合がある。 In the recovery method of the present invention, the blast particles containing indium are, for example, blast particles used for removing the ITO film. Indium and tin as ITO film components adhere to the blast particles, and steel components such as iron, nickel, and chromium as components of the sputtering apparatus may adhere.
図示するように、このブラスト粒子を塩酸および/または硫酸に溶解してブラスト粒子に含まれるＩＴＯ成分のインジウムおよびスズを浸出させる（溶解工程）。また、このブラスト粒子に鉄、クロム、ニッケルが含まれている場合には、これらもインジウムおよびスズと共に浸出される。一方、ブラスト粒子の主成分であるアルミナやシリカは溶解せずに残渣となる。 As shown in the figure, the blast particles are dissolved in hydrochloric acid and / or sulfuric acid to leach out indium and tin as ITO components contained in the blast particles (dissolution step). Moreover, when iron, chromium, and nickel are contained in the blast particles, these are also leached together with indium and tin. On the other hand, alumina and silica, which are the main components of the blast particles, do not dissolve and become a residue.
なお、塩酸や硫酸に代えて硝酸を用いると、スズが硝酸と反応して不溶性のメタスズ酸沈澱を生じ、このメタスズ酸沈澱は濾過性が良くないので好ましくない。塩酸または硫酸の濃度は塩酸が２モル/L以上、硫酸が１００ｇ/L以上が適当であり、液温は５０℃以上、好ましくは７０℃以上が良い。 If nitric acid is used instead of hydrochloric acid or sulfuric acid, tin reacts with nitric acid to produce an insoluble metastannic acid precipitate, which is not preferred because the filterability is not good. The concentration of hydrochloric acid or sulfuric acid is suitably 2 mol / L or higher for hydrochloric acid and 100 g / L or higher for sulfuric acid, and the liquid temperature is 50 ° C. or higher, preferably 70 ° C. or higher.
上記浸出溶解液を濾過して溶解残渣のアルミナおよびシリカを濾液から分離する（濾過工程）。次いで、この濾液のｐＨを０〜２に調整し、該濾液にスズより卑な金属、例えば亜鉛粉末を添加して液中のスズをメタルに還元し、金属スズの澱物を生成させる。一方、インジウムは還元されず液中に残るので、これを濾過してスズ含有澱物を分離し、脱スズ濾液を得る（脱スズ工程）。 The leaching solution is filtered to separate dissolved residues of alumina and silica from the filtrate (filtration step). Next, the pH of the filtrate is adjusted to 0 to 2, and a metal lower than tin, such as zinc powder, is added to the filtrate to reduce tin in the liquid to metal, thereby producing a metal tin starch. On the other hand, since indium is not reduced and remains in the liquid, it is filtered to separate a tin-containing starch, thereby obtaining a tin removal filtrate (tin removal step).
ブラスト粒子にスズと共にニッケルが含まれている場合には、上記脱スズ工程においてスズと共にニッケルの一部がメタルに還元されてスズとニッケルを含む澱物が生成する。このスズニッケル含有澱物を濾過分離する。この脱スズ工程において、亜鉛粉末の添加量は液中のスズおよびニッケル含有量と当量が好ましい。また、亜鉛粉末の添加雰囲気は大気中よりも不活性雰囲気下がより好ましい。 When nickel is contained in the blast particle together with tin, a part of nickel together with tin is reduced to metal in the detinning step to produce a starch containing tin and nickel. The tin-nickel-containing starch is separated by filtration. In this tin removal step, the amount of zinc powder added is preferably equivalent to the tin and nickel content in the liquid. The atmosphere in which zinc powder is added is more preferably an inert atmosphere than in the air.
上記脱スズ濾液からさらにニッケルを除去するには、脱スズ濾液に脱ニッケル剤を添加してニッケル含有澱物を生成させ、この澱物を固液分離することによって脱ニッケルを進める（脱ニッケル工程）。脱ニッケル剤としては、例えば、ジメチルグリオキシムなどを用いると良い。脱スズ濾液のｐＨを１〜３.５に調整し、ジメチルグリオキシムを添加すれば、液中に残留するニッケルイオンはジメチルグリオキシムと反応してキレート錯化合物を形成してニッケル含有澱物が生成するので、これを濾過分離して液中のニッケルイオンを除去することができる。 To further remove nickel from the tin removal filtrate, a nickel-containing starch is produced by adding a nickel removal agent to the tin removal filtrate, and the nickel removal proceeds by solid-liquid separation of the starch (denicking step). ). For example, dimethylglyoxime may be used as the nickel removal agent. When the pH of the tin-free filtrate is adjusted to 1 to 3.5 and dimethylglyoxime is added, nickel ions remaining in the liquid react with dimethylglyoxime to form a chelate complex compound, and the nickel-containing starch is formed. Since it is formed, it can be filtered and removed to remove nickel ions in the liquid.
上記脱スズ濾液ないし脱スズニッケル濾液に、インジウムよりも卑な金属、例えば亜鉛を添加してインジウムを還元し、スポンジ状の金属インジウムを析出させる（インジウム還元工程）。これを濾過分離して回収する。インジウム還元時のｐＨはインジウムの水酸化物沈殿が生成する領域以下であれば特に制限は無いが、好ましくはｐＨ１〜３に維持することが、亜鉛消費量の観点から好ましい。 A metal that is lower than indium, such as zinc, is added to the above tin-free or tin-free nickel filtrate to reduce indium, thereby depositing sponge-like metal indium (indium reduction step). This is separated by filtration and recovered. The pH at the time of indium reduction is not particularly limited as long as it is below the region where indium hydroxide precipitate is generated, but it is preferably maintained at pH 1 to 3 from the viewpoint of zinc consumption.
本発明の実施例を以下に示す。結果を表１に示した。
〔実施例Ａ１〕
ＩＴＯ膜除去に用いたブラスト粒子（アルミナ７５wt％）２００ｇを塩酸1L（濃度２mol/L）に混合し、６０℃に加熱して溶解させた。この塩酸溶解液を濾過し、溶解残渣１６０ｇを分離した。この残渣はアルミナ９４wt％であった。一方、濾液のｐＨを１.０に調整し、大気雰囲気下にて亜鉛粉末を添加、生成した澱物５.１ｇを濾過分離した。この澱物はスズ７０wt％およびニッケル２０wt％であった。このニッケルスズ含有澱物を分離した濾液のｐＨを１〜３.５に調整し、ジメチルグリオキシムを添加して生成した澱物１.２ｇを濾過分離した。この澱物はニッケル２０wt％であった。このニッケル澱物を分離した濾液に亜鉛粉末を添加し、析出したスポンジ状の金属インジウム３５ｇを回収した。この金属インジウムのスズおよびニッケルの含有量はそれぞれ３０ppm、５０ppmであった。
Examples of the present invention are shown below. The results are shown in Table 1.
[Example A1]
200 g of blast particles (alumina 75 wt%) used for removing the ITO film were mixed with 1 L of hydrochloric acid (concentration 2 mol / L) and dissolved by heating to 60 ° C. This hydrochloric acid solution was filtered to separate 160 g of the dissolution residue. This residue was 94 wt% alumina. On the other hand, the pH of the filtrate was adjusted to 1.0, zinc powder was added in an air atmosphere, and 5.1 g of the produced starch was separated by filtration. The starch was 70 wt% tin and 20 wt% nickel. The pH of the filtrate from which the nickel tin-containing starch was separated was adjusted to 1 to 3.5, and 1.2 g of the starch produced by adding dimethylglyoxime was separated by filtration. This starch was 20 wt% nickel. Zinc powder was added to the filtrate from which the nickel starch had been separated, and 35 g of the spongy metal indium deposited was recovered. The contents of tin and nickel in the metal indium were 30 ppm and 50 ppm, respectively.
〔実施例Ａ２〜Ａ４〕
溶解条件を表１に示すように調整した以外は実施例Ａ１と同様にして金属インジウムを得た。この結果を表１に示した。
[Examples A2 to A4]
Indium metal was obtained in the same manner as in Example A1, except that the dissolution conditions were adjusted as shown in Table 1. The results are shown in Table 1.
〔試験No.Ｂ１〜No.Ｂ２〕
溶解条件および各処理工程を表１に示すように変更した以外は実施例Ａ１と同様にして金属インジウムを得た。この結果を表１に示した。
[Test No. B1-No. B2]
Indium metal was obtained in the same manner as in Example A1, except that the dissolution conditions and the treatment steps were changed as shown in Table 1. The results are shown in Table 1.
〔実施例Ｃ１〕
ＩＴＯ膜除去に用いたシリカ粒子（主成分シリカ）２５０ｇを塩酸1L（濃度２mol/L）に混合し、６０℃に加熱して溶解させた。この塩酸溶解液を濾過し、溶解残渣２１０ｇを分離した。この残渣はシリカ９４wt％であった。一方、濾液のｐＨを１.０に調整し、大気雰囲気下にて亜鉛粉末を添加、生成した澱物５.０ｇを濾過分離した。この澱物はスズ７０wt％およびニッケル２０wt％であった。このニッケルスズ含有澱物を分離した濾液のｐＨを１〜３.５に調整し、ジメチルグリオキシムを添加して生成した澱物１.３ｇを濾過分離した。この澱物はニッケル２０wt％であった。このニッケル澱物を分離した濾液に亜鉛粉末を添加し、析出したスポンジ状の金属インジウム３５ｇを回収した。この金属インジウムのスズおよびニッケルの含有量はそれぞれ２５ppm、４５ppmであった。
[Example C1]
250 g of silica particles (main component silica) used for removing the ITO film were mixed with 1 L of hydrochloric acid (concentration 2 mol / L) and dissolved by heating to 60 ° C. This hydrochloric acid solution was filtered to separate 210 g of the dissolution residue. This residue was 94 wt% silica. On the other hand, the pH of the filtrate was adjusted to 1.0, zinc powder was added in an air atmosphere, and 5.0 g of the produced starch was separated by filtration. The starch was 70 wt% tin and 20 wt% nickel. The pH of the filtrate from which the nickel tin-containing starch was separated was adjusted to 1 to 3.5, and 1.3 g of the starch produced by adding dimethylglyoxime was separated by filtration. This starch was 20 wt% nickel. Zinc powder was added to the filtrate from which the nickel starch had been separated, and 35 g of the spongy metal indium deposited was recovered. The contents of tin and nickel in the metal indium were 25 ppm and 45 ppm, respectively.
〔実施例Ｃ２〜Ｃ３〕
溶解条件を表１に示すように調整した以外は実施例Ａ１と同様にして金属インジウムを得た。この結果を表１に示した。
[Examples C2 to C3]
Indium metal was obtained in the same manner as in Example A1, except that the dissolution conditions were adjusted as shown in Table 1. The results are shown in Table 1.
表１に示すように、Ａ１〜Ａ４およびＢ１〜Ｂ２は何れも同一のブラスト粉末を使用しているが、溶解工程の液温が２０℃および４０℃のNo.Ｂ１、No.Ｂ２は、溶解温度が高いNo.Ａ１〜No.Ａ４よりも液中のＩｎ濃度が低下している。一方、No.Ａ１〜No.Ａ４では、液中Ｉｎ濃度が３４g/L以上であり、溶解液のインジウム濃度が高い。 As shown in Table 1, A1 to A4 and B1 to B2 all use the same blast powder, but No.B1 and No.B2 whose solution temperatures are 20 ° C and 40 ° C are dissolved. The In concentration in the liquid is lower than that of No. A1 to No. A4 where the temperature is high. On the other hand, in No. A1 to No. A4, the In concentration in the liquid is 34 g / L or more, and the indium concentration of the solution is high.
試料No.Ｂ１は亜鉛粉末による脱スズ工程を省略したものであり、最終的なＩｎスポンジ中のＳｎ含有量が１１.４％であって極めて高い。また、脱ニッケル工程ではジメチルグリオキシムのアルコール溶液への溶解度が低いため、多量のアルコール溶液を添加する必要があり、脱スズを実施していないことから、脱ニッケル工程でのｐＨを３.５程度まで上昇させることが困難なため、Ｉｎスポンジ中のＮｉ濃度も上昇している。 Sample No. B1 is obtained by omitting the tin removal step with zinc powder, and the Sn content in the final In sponge is 11.4%, which is extremely high. In addition, since the solubility of dimethylglyoxime in an alcohol solution is low in the nickel removal step, it is necessary to add a large amount of alcohol solution, and since tin removal is not performed, the pH in the nickel removal step is set to 3.5. Since it is difficult to raise to the extent, the Ni concentration in the In sponge is also increased.
試料No.Ｂ２は脱スズ工程を実施した後の脱ニッケル工程を省略したものであり、脱スズ工程によってニッケルがスズと共に除去されるので、Ｉｎスポンジ中のＮｉ含有量は試料No.Ｂ１よりも低く、０.５％程度であるが、脱ニッケル工程を実施した試料No.Ａ１〜Ａ４よりは高い。 Sample No. B2 is obtained by omitting the nickel removal step after the tin removal step. Since nickel is removed together with tin by the tin removal step, the Ni content in the In sponge is higher than that of sample No. B1. Although it is low and about 0.5%, it is higher than Sample Nos. A1 to A4 subjected to the nickel removal step.
Claims (3)
Indium-containing blast particles are dissolved in hydrochloric acid and / or sulfuric acid to leach indium (dissolution step), and then alumina and / or silica, which are the main components of the blast particles, are filtered and separated as a dissolution residue (filtration step). A method for recovering indium from blast particles, comprising adding a metal lower than indium to the filtrate to reduce and deposit indium in the solution (indium reduction deposition step), and recovering sponge-like metal indium.
2. The method according to claim 1, wherein the blast particles containing indium are blast particles used for removing the ITO film, and the blast particles are dissolved in hydrochloric acid and / or sulfuric acid to leach indium (dissolution step), and then the dissolution residue is filtered. Separate (filtering step), and add zinc powder or indium to the filtrate to reduce and precipitate tin, and filter and separate (tin removal step). Add zinc to the detinned filtrate to reduce and deposit indium. (Indium reduction deposition step), a method of recovering sponge-like metal indium.
3. The method according to claim 2, wherein blast particles containing tin and nickel together with indium are dissolved in hydrochloric acid and / or sulfuric acid to leach indium (filtering step), and then the dissolved residue is separated by filtration (filtering step). Zinc powder or indium is added to the solution to reduce and precipitate tin and nickel (tin removal process), and a nickel removal agent is further added to the filtrate to form a nickel-containing starch, which is separated by filtration (denitration). Nickel step), adding zinc to the filtrate to reduce and deposit indium (indium reduction deposition step), and recovering sponge-like metal indium.
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| JP2006204528A JP2007056366A (en) | 2005-07-29 | 2006-07-27 | Method for recovering indium from blast particle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009215623A (en) * | 2008-03-12 | 2009-09-24 | Dowa Metals & Mining Co Ltd | Method for recovering indium |
| WO2016111571A1 (en) * | 2015-01-08 | 2016-07-14 | 주식회사 화류테크 | Method for collecting indium and tin using industrial waste |
| CN110117724A (en) * | 2019-04-04 | 2019-08-13 | 湖南工程学院 | A kind of recovery method of indium in carbon thermal reduction slag containing indium |
-
2006
- 2006-07-27 JP JP2006204528A patent/JP2007056366A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009215623A (en) * | 2008-03-12 | 2009-09-24 | Dowa Metals & Mining Co Ltd | Method for recovering indium |
| WO2016111571A1 (en) * | 2015-01-08 | 2016-07-14 | 주식회사 화류테크 | Method for collecting indium and tin using industrial waste |
| CN110117724A (en) * | 2019-04-04 | 2019-08-13 | 湖南工程学院 | A kind of recovery method of indium in carbon thermal reduction slag containing indium |
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