JPH09235632A - Method for removing manganese from manganese-containing molten aluminum - Google Patents
Method for removing manganese from manganese-containing molten aluminumInfo
- Publication number
- JPH09235632A JPH09235632A JP4373296A JP4373296A JPH09235632A JP H09235632 A JPH09235632 A JP H09235632A JP 4373296 A JP4373296 A JP 4373296A JP 4373296 A JP4373296 A JP 4373296A JP H09235632 A JPH09235632 A JP H09235632A
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- Japan
- Prior art keywords
- molten
- compound
- alloy
- added
- molten metal
- 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.)
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Classifications
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- 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
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- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はＡｌまたはＡｌ合金
を精製する方法に関し、詳細にはＡｌまたはＡｌ合金ス
クラップを溶解したＡｌ溶湯から不純物元素であるＭｎ
を除去する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying Al or an Al alloy, and more specifically, it is an impurity element Mn from an Al melt obtained by melting scrap of Al or an Al alloy.
It is about the method of removing.
【０００２】[0002]
【従来の技術】Ａｌ及びＡｌ合金は、その優れた表面美
麗性，軽量性，加工性等から建築材料，自動車材料，飲
料缶など多方面にわたって利用されており、最近では資
源の有効利用の観点からリサイクルが積極的に進められ
ている。但し、ＡｌまたはＡｌ合金のスクラップを回収
する際にはＡｌまたはＡｌ合金以外の金属材料または非
金属材料が混入することが一般的であり、ＦｅやＭｎ等
の不純物元素が混入すると共晶化合物が粗大化する等の
不都合が生じ、強度，靭性，表面処理性などが著しく劣
化するという問題がある。そこで不純物の分離・除去に
関する技術が種々提案されており、例えば、偏析法，電
気分解法，化合物法等が知られている。2. Description of the Related Art Al and Al alloys have been used in various fields such as building materials, automobile materials, and beverage cans due to their excellent surface beauty, light weight, workability, etc., and recently, effective utilization of resources has been considered. Since then, recycling is being actively promoted. However, when recovering scrap of Al or Al alloy, it is common to mix metal material or non-metal material other than Al or Al alloy, and if impurity elements such as Fe and Mn are mixed, eutectic compound will be formed. Inconveniences such as coarsening occur, and there is a problem that strength, toughness, surface treatment property, etc. are significantly deteriorated. Therefore, various techniques regarding separation / removal of impurities have been proposed, and for example, segregation method, electrolysis method, compound method, etc. are known.
【０００３】偏析法は、Ａｌ溶湯を冷却していくと純度
の高いＡｌが先に凝固する原理を用いる方法であり、例
えば特開昭６１−１６６９２９号公報等に開示されてい
るが、生産性が非常に悪いという問題を有していた。The segregation method is a method which uses the principle that high-purity Al solidifies first as the molten aluminum is cooled, and is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-166929. Had the problem of being very bad.
【０００４】電気分解法は、電気分解によって不純物を
陽極に残し、高純度Ａｌを陰極に集める方法であり、例
えば特公昭６２−１０３１５号公報に開示されている
が、非常に多量の電力を消費するという問題がある。The electrolysis method is a method in which impurities are left in the anode by electrolysis and high-purity Al is collected in the cathode, which is disclosed in, for example, Japanese Patent Publication No. 62-10315, but consumes a very large amount of power. There is a problem of doing.
【０００５】化合物法は、不純物元素と不溶性化合物を
形成し得る元素を溶湯中に添加することにより、上記不
純物元素を含有する複合化合物として除去する方法であ
り、生産性に優れ、エネルギー消費量も少ない。例えば
特公昭５７−２１３４号公報には、Ｆｅを不純物として
含有するＡｌ溶湯にＡｌ−Ｍｎ金属間化合物を添加する
方法が開示されている。しかしながら、この方法によれ
ば多量のＭｎを添加する必要があり、かえって添加元素
によりＡｌ溶湯が汚染されることが指摘されていた。ま
た、Ｍｎを不純物として含有するＡｌ溶湯から化合物法
によりＭｎを除去する方法は、これまで提案されていな
かった。The compound method is a method in which an element capable of forming an insoluble compound with an impurity element is added to a molten metal to remove it as a complex compound containing the above impurity element, which is excellent in productivity and energy consumption. Few. For example, Japanese Patent Publication No. 57-2134 discloses a method of adding an Al-Mn intermetallic compound to an Al melt containing Fe as an impurity. However, according to this method, it was necessary to add a large amount of Mn, and it was pointed out that the molten aluminum was contaminated by the additive element. Further, a method of removing Mn from an Al molten metal containing Mn as an impurity by a compound method has not been proposed so far.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記事情に着
目してなされたものであって、生産性に優れ、エネルギ
ー消費量も少ない上記化合物法において、添加元素によ
りＡｌまたはＡｌ合金溶湯を汚染することなく、不純物
であるＭｎを除去し得る方法を提供しようとするもので
ある。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and contaminates Al or Al alloy molten metal with an additive element in the above compound method having excellent productivity and low energy consumption. The present invention aims to provide a method capable of removing Mn as an impurity without doing so.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決した本発
明とは、Ｍｎを含有するＡｌまたはＡｌ合金スクラップ
を溶解したＡｌ溶湯からＭｎを除去する方法であって、
該Ａｌ溶湯中にＣｒ及びＶをＣｒ／Ｖ比（質量比：以下
同様）が０．５〜１．５となる範囲で添加することによ
りＭｎを含有する複合化合物を形成し、該複合化合物を
分離して除去することを要旨とするものである。The present invention, which has solved the above-mentioned problems, is a method for removing Mn from an Al molten metal in which Al or Al alloy scrap containing Mn is melted.
By adding Cr and V to the molten aluminum at a Cr / V ratio (mass ratio: the same applies hereinafter) of 0.5 to 1.5, a composite compound containing Mn is formed. The purpose is to separate and remove.
【０００８】尚、Ｃｒ及びＶの合計添加量は、溶湯中の
Ｍｎ含有量に対して質量比で０．５〜２倍であることが
好ましく、またＣｒ及びＶを添加したＡｌ溶湯は、該Ａ
ｌ溶湯の流動性が良好である温度以上で、且つ前記複合
化合物の溶融温度以下で所定時間保持することが推奨さ
れる。The total addition amount of Cr and V is preferably 0.5 to 2 times in mass ratio with respect to the Mn content in the molten metal, and the Al molten metal added with Cr and V is A
It is recommended to maintain the temperature above the temperature at which the melt has good fluidity and below the melting temperature of the composite compound for a predetermined time.
【０００９】[0009]
【発明の実施の形態】Ａｌ溶湯中のＭｎは極めて化合物
を形成しにくく、Ａｌ溶湯から化合物法によりＭｎを除
去することは非常に困難であると考えられてきた。しか
しながら、本発明者らが鋭意検討した結果、Ａｌ溶湯中
にＣｒ及びＶを同時に添加すると、Ｍｎは以下の反応等
により複合化合物を形成し、Ａｌ溶湯を汚染することな
く分離・除去し得ることを見出した。 ６Ａｌ＋Ｍｎ＋Ｖ＋Ｃｒ → Ａｌ6 （Ｍｎ，Ｖ，Ｃ
ｒ）BEST MODE FOR CARRYING OUT THE INVENTION It has been considered that it is extremely difficult to remove Mn from an Al melt by a compound method, because Mn in the Al melt is extremely difficult to form a compound. However, as a result of diligent studies by the present inventors, it was found that when Cr and V are simultaneously added to the molten aluminum, Mn forms a complex compound due to the following reaction, etc., and can be separated / removed without contaminating the molten aluminum. Found. 6Al + Mn + V + Cr → Al 6 (Mn, V, C
r)
【００１０】尚、Ｃｒ及びＶをＡｌ溶湯中に添加するに
あたり、Ｃｒ／Ｖ比が０．５未満であるか、或いは１．
５を超える場合には、Ｃｒ及びＶを多量に添加すること
が必要となり却ってＡｌ溶湯を汚染することになるので
好ましくない。従ってＣｒ／Ｖ比は０．５〜１．５にな
る様にＣｒとＶを添加することが必要であり、０．８〜
１．２の範囲であると望ましい。When Cr and V are added to the molten aluminum, the Cr / V ratio is less than 0.5, or 1.
If it exceeds 5, it is not preferable because it is necessary to add a large amount of Cr and V and contaminate the molten Al. Therefore, it is necessary to add Cr and V so that the Cr / V ratio becomes 0.5 to 1.5.
A range of 1.2 is desirable.
【００１１】また、Ｃｒ及びＶの合計添加量としては、
化合物を生成する為の反応の頻度を考えるとＭｎ濃度の
０．５倍以上添加することが望ましく、溶湯中のＭｎの
０．８倍以上添加することがより好ましい。但し、Ｃｒ
及びＶを溶湯中のＭｎ含有量に対して過度に多く添加す
ると、Ｃｒ及びＶによる汚染が発生してしまう。従っ
て、Ｃｒ及びＶの添加量の上限値は、溶湯中のＭｎに対
して化学量論比で３倍程度までとすることが望ましく、
質量比で２倍までとすることがより好ましい。The total addition amount of Cr and V is as follows.
Considering the frequency of the reaction for forming the compound, it is desirable to add 0.5 times or more of the Mn concentration, and more preferably 0.8 times or more of Mn in the molten metal. However, Cr
If V and V are added in an excessively large amount with respect to the Mn content in the molten metal, contamination by Cr and V will occur. Therefore, it is desirable that the upper limit of the amount of addition of Cr and V be up to about three times as stoichiometric with respect to Mn in the molten metal,
More preferably, the mass ratio is up to twice.
【００１２】本発明は、Ａｌ溶湯中にＣｒ及びＶを添加
する方法を限定するものではなく、Ｃｒ及びＶを主体と
する合金として添加してもよく、Ｃｒ及びＶを個別に添
加してもよい。本発明ではＡｌ溶湯中にＣｒ及びＶをＭ
ｎ量に応じて添加すればよいが、添加後に撹拌すれば反
応効率を高めることができ好ましい。The present invention does not limit the method of adding Cr and V to the molten aluminum, but may be added as an alloy mainly containing Cr and V, or Cr and V may be added individually. Good. In the present invention, Cr and V are added to M in the molten aluminum.
It may be added depending on the amount of n, but it is preferable to stir after the addition because the reaction efficiency can be increased.
【００１３】また添加後にＭｎ含有複合化合物を形成さ
せるにあたっては、Ｃｒ及びＶを添加したＡｌ溶湯を、
該Ａｌ溶湯の流動性が良好である温度以上で、且つ前記
複合化合物の溶融温度以下で所定時間保持することが推
奨される。Ａｌ溶湯の保持温度が低過ぎると、液相より
も固相の方が多くなり、複合化合物生成の反応効率が低
下する。一方保持温度が高過ぎると、Ｍｎの残存量が増
加する傾向にある。この理由は、生成したＭｎ含有複合
化合物が再溶解するためであると考えられる。尚、Ａｌ
及びＡｌ合金の溶解温度は、６８０〜９００℃が一般的
であるので、保持温度は６５０℃以上とすることが望ま
しい。一方保持温度の上限値は、上記複合化合物の組成
及びその融点にもよるが、７２０℃以下が好ましく、７
００℃以下であるとより好ましい。また保持時間は可及
的に長い程よいが、通常工程では１時間程度で十分であ
る。Further, in forming the Mn-containing composite compound after the addition, an Al melt containing Cr and V is added,
It is recommended that the molten aluminum be held at a temperature not lower than the fluidity of the molten aluminum and not higher than the melting temperature of the composite compound for a predetermined time. When the holding temperature of the molten aluminum is too low, the solid phase is more than the liquid phase, and the reaction efficiency of forming the complex compound is reduced. On the other hand, if the holding temperature is too high, the residual amount of Mn tends to increase. It is considered that the reason is that the produced Mn-containing composite compound is redissolved. In addition, Al
Since the melting temperature of Al alloy and Al is generally 680 to 900 ° C., the holding temperature is preferably 650 ° C. or higher. On the other hand, the upper limit of the holding temperature depends on the composition of the composite compound and its melting point, but is preferably 720 ° C. or lower,
It is more preferable that the temperature is 00 ° C. or less. The holding time is preferably as long as possible, but about 1 hour is sufficient in the normal process.
【００１４】Ｍｎを含む複合化合物が生成したＡｌ溶湯
から、上記複合化合物を分離・除去するにあたっては、
公知の方法を用いればよく、一般的な除去方法として
は、溶湯を鎮静化することにより複合化合物を湯面に
浮上させて除去する方法、Ａｌ溶湯と不活性なガス
（Ａｒ，Ｈｅ，Ｎｅ，Ｎ2 等）を、微細な気泡として溶
湯内に吹込み、該気泡に複合化合物を付着させて浮上分
離を促進する方法、耐火物製フィルターを用いてろ過
する方法等が例示でき、これらの方法を単独または組み
合わせて実施すれば良い。In separating / removing the above-mentioned composite compound from the Al molten metal in which the composite compound containing Mn is formed,
A known method may be used. As a general removal method, a method of removing the composite compound by floating the complex compound on the molten metal surface by calming the molten metal, an Al molten metal and an inert gas (Ar, He, Ne, N 2 and the like) are blown into the molten metal as fine bubbles, and a composite compound is attached to the bubbles to promote floating separation, a method of filtering using a refractory filter, and the like. May be performed alone or in combination.
【００１５】本発明は前記化合物法を採用するものであ
るが、従来技術の特公昭５７−２１３４号公報に記載さ
れたＶ添加による方法と比較して、添加元素量が少量で
も効率良くＭｎ成分が除去できると共に、添加元素の残
留が非常に少ないという利点を有する。さらにＭｎを含
有する複合化合物中におけるＡｌ含有量も少量であるた
め、溶湯中のＡｌのロスを可及的に抑制して不純物元素
のＭｎを分離・除去することが可能である。The present invention employs the above compound method, but compared with the method of adding V described in Japanese Patent Publication No. 57-2134 of the prior art, the Mn component can be efficiently added even with a small amount of added element. Has the advantage that it can be removed, and the residual amount of additional elements is very small. Furthermore, since the Al content in the Mn-containing composite compound is also small, it is possible to separate and remove the impurity element Mn by suppressing the loss of Al in the molten metal as much as possible.
【００１６】以下、本発明を実施例によって更に詳細に
説明するが、下記実施例は本発明を限定する性質のもの
ではなく、前・後記の主旨に徴して設計変更することは
いずれも本発明の技術的範囲に含まれるものである。Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following Examples are not intended to limit the present invention, and any modification of the design can be made in view of the gist of the preceding and the following. Are included in the technical scope of.
【００１７】[0017]
【実施例】実施例１ 原料として、Ｍｎを０．５〜２．０質量％含有するＪＩ
Ｓ１１００系Ａｌスクラップを使用し、これを１０トン
の反射型溶解炉（重油焚き）を用いて大気雰囲気下７５
０℃で溶解した。得られた溶湯にＣｒ／Ｖ比が１．５で
あるＣｒ−Ｖ合金を添加し、６７０℃で０．５時間保持
した。等温保持後の溶湯をサンプリングして元素分析を
行った。Ｍｎ濃度とＣｒ−Ｖ合金の添加量の結果を図１
に示す。 Example 1 JI containing 0.5 to 2.0 mass% of Mn as a raw material
S1100 system Al scrap is used, and this is used in a 10 ton reflection type melting furnace (heavy oil fired) under atmospheric air 75
Dissolved at 0 ° C. A Cr-V alloy having a Cr / V ratio of 1.5 was added to the obtained molten metal, and the mixture was kept at 670 ° C for 0.5 hours. The molten metal after isothermal holding was sampled for elemental analysis. Figure 1 shows the results of the Mn concentration and the amount of Cr-V alloy added.
Shown in
【００１８】図１の結果から、Ｃｒ及びＶを添加するこ
とにより、Ｍｎ濃度を効率良く低減できることが分か
る。尚、Ａｌ溶湯中におけるＭｎ濃度の初期値にもよる
が、例えばＭｎ濃度の初期値が２％の場合、Ｃｒ及びＶ
の添加量はＭｎ濃度初期値の１／２に相当する１％以上
が好ましいことが分かる。From the results shown in FIG. 1, it can be seen that the Mn concentration can be efficiently reduced by adding Cr and V. Incidentally, depending on the initial value of the Mn concentration in the molten aluminum, for example, when the initial value of the Mn concentration is 2%, Cr and V
It is understood that the addition amount of is preferably 1% or more, which corresponds to ½ of the initial value of the Mn concentration.
【００１９】実施例２ 下記の条件以外は実施例１と同様にしてＡｌ溶湯のサン
プリングを行い、Ｃｒ−Ｖ合金の添加量とＡｌ溶湯中の
Ｍｎ濃度との関係を調べた。結果は図２に示す。 原料 ：ＪＩＳ３００４系Ａｌスクラップ 溶解温度：７２０℃ 保持温度：６９５℃ 保持時間：１時間 溶解炉 ：ＬＮＧだき５ｔ反射型溶解炉 添加元素：Ｃｒ及びＶ（母合金中のＣｒ／Ｖ比が１） 図２の結果から、Ｃｒ及びＶを添加することにより、Ｍ
ｎ濃度を効率良く低減できることが分かる。 Example 2 Al molten metal was sampled in the same manner as in Example 1 except for the following conditions, and the relationship between the added amount of Cr-V alloy and the Mn concentration in the Al molten metal was investigated. The results are shown in Figure 2. Raw material: JIS3004 type Al scrap Melting temperature: 720 ° C Holding temperature: 695 ° C Holding time: 1 hour Melting furnace: LNG fired 5t reflective melting furnace Additive elements: Cr and V (Cr / V ratio in mother alloy is 1) Figure From the result of 2, by adding Cr and V, M
It can be seen that the n concentration can be efficiently reduced.
【００２０】実施例３ 下記の条件以外は実施例１と同様にしてＡｌ溶湯のサン
プリングを行い、Ｃｒ−Ｖ合金の添加量とＡｌ溶湯中の
Ｍｎ濃度との関係を調べた。結果は図３に示す。 原料 ：ＪＩＳ５０００系Ａｌスクラップ 溶解温度：７５０℃ 保持温度：６７０℃ 保持時間：５０分間 溶解炉 ：重油だき５ｔ反射型溶解炉 添加元素：Ｃｒ及びＶ（母合金中のＣｒ／Ｖ比が０．
５） 図３の結果から、Ｃｒ及びＶを添加することにより、Ｍ
ｎ濃度を効率良く低減できることが分かる。 Example 3 The molten aluminum was sampled in the same manner as in Example 1 except for the following conditions, and the relationship between the added amount of Cr—V alloy and the Mn concentration in the molten aluminum was investigated. The results are shown in FIG. Raw material: JIS 5000 series Al scrap Melting temperature: 750 ° C. Holding temperature: 670 ° C. Holding time: 50 minutes Melting furnace: Heavy oil-fired 5 t reflective melting furnace Additive elements: Cr and V (Cr / V ratio in mother alloy is 0.
5) From the results of FIG. 3, by adding Cr and V, M
It can be seen that the n concentration can be efficiently reduced.
【００２１】[0021]
【発明の効果】本発明は以上の様に構成されているの
で、生産性に優れ、エネルギー消費量も少ない化合物法
において、少量の添加でＭｎを含有する複合化合物を形
成でき、添加元素によりＡｌ溶湯を汚染することなくＭ
ｎを除去する方法が提供できることとなった。EFFECTS OF THE INVENTION Since the present invention is constituted as described above, in the compound method having excellent productivity and low energy consumption, a complex compound containing Mn can be formed with a small amount of addition, and Al can be added by the addition element. M without contaminating the molten metal
It has become possible to provide a method for removing n.
【図１】Ｃｒ及びＶ合金（Ｃｒ／Ｖ比：１．５）の添加
量とＡｌ溶湯中のＭｎ濃度との関係を示すグラフであ
る。FIG. 1 is a graph showing the relationship between the amounts of Cr and V alloys (Cr / V ratio: 1.5) added and the Mn concentration in molten Al.
【図２】Ｃｒ及びＶ合金（Ｃｒ／Ｖ比：１．０）の添加
量とＡｌ溶湯中のＭｎ濃度との関係を示すグラフであ
る。FIG. 2 is a graph showing the relationship between the added amounts of Cr and V alloy (Cr / V ratio: 1.0) and the Mn concentration in the molten Al.
【図３】Ｃｒ及びＶ合金（Ｃｒ／Ｖ比：０．５）の添加
量とＡｌ溶湯中のＭｎ濃度との関係を示すグラフであ
る。FIG. 3 is a graph showing the relationship between the added amounts of Cr and V alloy (Cr / V ratio: 0.5) and the Mn concentration in the molten Al.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 増田 隆平 兵庫県神戸市西区高塚台１丁目５番５号 株式会社神戸製鋼所神戸総合技術研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuhei Masuda 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Kobe Steel Works, Ltd. Kobe Research Institute
Claims (3)
ラップを溶解したＡｌ溶湯からＭｎを除去する方法であ
って、該Ａｌ溶湯中にＣｒ及びＶをＣｒ／Ｖ比が０．５
〜１．５となる範囲で添加することによりＭｎを含有す
る複合化合物を形成し、該複合化合物を分離して除去す
ることを特徴とするＡｌ溶湯からＭｎを除去する方法。1. A method for removing Mn from an Al melt in which Mn-containing Al or Al alloy scrap is melted, wherein Cr and V have a Cr / V ratio of 0.5.
A method for removing Mn from an Al melt, which comprises forming a complex compound containing Mn by adding it in a range of from 1.5 to 1.5 and separating and removing the complex compound.
ｎ含有量に対して質量比で０．５〜２倍である請求項１
に記載の方法。2. The total addition amount of Cr and V is M in the molten metal.
The mass ratio to the n content is 0.5 to 2 times.
The method described in.
ｌ溶湯の流動性が良好である温度以上で、且つ前記複合
化合物の溶融温度以下で保持する請求項１または２に記
載の方法。3. A molten Al containing Cr and V
3. The method according to claim 1, wherein the melt is held at a temperature at which the fluidity of the melt is good or higher and at a melting temperature of the composite compound or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4373296A JPH09235632A (en) | 1996-02-29 | 1996-02-29 | Method for removing manganese from manganese-containing molten aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4373296A JPH09235632A (en) | 1996-02-29 | 1996-02-29 | Method for removing manganese from manganese-containing molten aluminum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09235632A true JPH09235632A (en) | 1997-09-09 |
Family
ID=12671964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4373296A Withdrawn JPH09235632A (en) | 1996-02-29 | 1996-02-29 | Method for removing manganese from manganese-containing molten aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09235632A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019198476A1 (en) * | 2018-04-09 | 2019-10-17 | 株式会社神戸製鋼所 | Impurity removal method |
| JP2019183265A (en) * | 2018-04-09 | 2019-10-24 | 株式会社神戸製鋼所 | Impurity removal method |
-
1996
- 1996-02-29 JP JP4373296A patent/JPH09235632A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019198476A1 (en) * | 2018-04-09 | 2019-10-17 | 株式会社神戸製鋼所 | Impurity removal method |
| JP2019183265A (en) * | 2018-04-09 | 2019-10-24 | 株式会社神戸製鋼所 | Impurity removal method |
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