JPH04221010A - Method for removing cu in molten iron alloy - Google Patents
Method for removing cu in molten iron alloyInfo
- Publication number
- JPH04221010A JPH04221010A JP2412793A JP41279390A JPH04221010A JP H04221010 A JPH04221010 A JP H04221010A JP 2412793 A JP2412793 A JP 2412793A JP 41279390 A JP41279390 A JP 41279390A JP H04221010 A JPH04221010 A JP H04221010A
- Authority
- JP
- Japan
- Prior art keywords
- molten iron
- iron alloy
- slag
- alkali
- alkaline earth
- 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.)
- Withdrawn
Links
- 229910000640 Fe alloy Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 12
- 239000010949 copper Substances 0.000 claims abstract description 36
- 239000002893 slag Substances 0.000 claims abstract description 34
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 10
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- -1 alkaline earth metal sulfide Chemical class 0.000 claims description 4
- 229910001514 alkali metal chloride Inorganic materials 0.000 claims description 3
- 229910001617 alkaline earth metal chloride Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052801 chlorine Inorganic materials 0.000 abstract description 7
- 239000000460 chlorine Substances 0.000 abstract description 7
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 5
- 150000001342 alkaline earth metals Chemical class 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 3
- 150000004763 sulfides Chemical class 0.000 abstract description 3
- 150000003467 sulfuric acid derivatives Chemical class 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 2
- 150000001805 chlorine compounds Chemical class 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000009991 scouring Methods 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- VDQVEACBQKUUSU-UHFFFAOYSA-M disodium;sulfanide Chemical compound [Na+].[Na+].[SH-] VDQVEACBQKUUSU-UHFFFAOYSA-M 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000007832 Na2SO4 Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910021592 Copper(II) chloride Inorganic materials 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
- 229910000870 Weathering steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 229910052718 tin Inorganic materials 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
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、鉄鋼スクラップを溶解
して不純物含有量の低い溶鋼を得ようとする場合に、特
に問題となるトランプエレメントのうち、Ｃｕを除去す
る方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing Cu from tramp elements, which is a particular problem when melting steel scrap to obtain molten steel with a low impurity content.
【０００２】0002
【従来の技術】最近、鉄源としてスクラップの使用比率
が増加する傾向にある。その中で、スクラップの成分的
な品質において、トランプエレメント、特にＣｕとＳｎ
の増加が問題になっている。このうちＣｕは、配線など
の異物として鉄鋼スクラップに混入するものと、耐候性
鋼のように合金成分として含まれるものが主なソースで
ある。溶鋼中のＣｕ成分は、高くなると熱間加工性の阻
害など鋼材製造工程で悪影響を及ぼすので、鋼種に応じ
て許容上限値が定められている。しかしながら、一旦溶
鋼中に入ったＣｕを精練によって除去することは容易で
はない。従来、工業的にスクラップからＣｕを除去する
のに、スクラップの固体処理、すなわち、固体状態での
単体分離と選別による方法に依存してきた。しかし、Ｃ
ｕの汚染が進行するにつれ、上記処理だけでは不十分と
なり、溶鋼から直接、精練によって除去できるようにな
ることが強く望まれている。溶鋼からのＣｕの除去方法
としては、これをアルカリあるいはアルカリ土類金属の
硫化物、ないしは硫酸塩を含むスラグによって処理し、
Ｃｕを硫化銅としてスラグに固定する方法が古くから研
究されている。しかし、この方法の欠点は、スラグの精
練能が小さいことからＣｕを除くための必要スラグ量が
多いことである。例えば、Ｃｕを５０％除去するのに必
要なスラグは１００ｋｇ／ｔ以上にものぼる。このよう
に多量のスラグが必要で、しかも精練対象がＣｕの除去
だけということであるので、精練費用が高すぎ、実用に
供することができなかった。また、これ以外の精練方法
としては、溶融鉄合金を塩素ガス、あるいは加熱により
塩素ガスを発生する物質（塩化鉄など）で処理し、Ｃｕ
を揮発しやすいＣｕＣｌ２として除去する方法が知られ
ている。しかし、この方法の欠点は、Ｃｕも蒸発するが
、鉄も塩素によって蒸発することにあり、結果的に溶融
鉄合金中のＣｕ濃度を効率的に下げることができないこ
とが問題である。BACKGROUND OF THE INVENTION Recently, there has been an increasing trend in the use of scrap as an iron source. Among them, in terms of the component quality of scrap, playing card elements, especially Cu and Sn.
is becoming a problem. Among these, the main sources of Cu are those mixed into steel scrap as foreign matter such as wiring, and those included as an alloy component such as in weathering steel. If the Cu content in molten steel becomes high, it will have an adverse effect on the steel manufacturing process, such as inhibiting hot workability, so an upper limit of the permissible value is determined depending on the steel type. However, it is not easy to remove Cu once it has entered molten steel by scouring. Conventionally, industrial removal of Cu from scrap has relied on solid treatment of scrap, that is, a method of separating and sorting the scrap in a solid state. However, C
As U contamination progresses, the above treatment alone becomes insufficient, and it is strongly desired to be able to remove it directly from molten steel by scouring. A method for removing Cu from molten steel is to treat it with slag containing sulfides or sulfates of alkali or alkaline earth metals,
A method of fixing Cu to slag as copper sulfide has been studied for a long time. However, a drawback of this method is that the amount of slag required to remove Cu is large because the slag scouring ability is small. For example, the amount of slag required to remove 50% of Cu is as much as 100 kg/t or more. Since such a large amount of slag is required and the only object of scouring is the removal of Cu, the scouring cost is too high and it could not be put to practical use. In addition, as another method of scouring, molten iron alloy is treated with chlorine gas or a substance that generates chlorine gas when heated (such as iron chloride), and Cu
A method is known in which CuCl2 is removed as it easily volatizes. However, a drawback of this method is that although Cu is also evaporated, iron is also evaporated by chlorine, and as a result, the problem is that the Cu concentration in the molten iron alloy cannot be efficiently lowered.
【０００３】0003
【発明が解決しようとする課題】以上のような事情に鑑
み、本発明においては溶融鉄合金中に含まれるＣｕを効
率的に除去する方法を提供しようとするものである。SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a method for efficiently removing Cu contained in a molten iron alloy.
【０００４】0004
【課題を解決するための手段】上記の課題を、本発明に
おいては、溶融鉄合金と、アルカリあるいはアルカリ土
類金属の硫化物、ないしは硫酸塩を含むスラグを形成せ
しめ、該スラグにアルカリあるいはアルカリ土類金属の
塩化物を添加することにより、 溶融鉄合金中のＣｕを
スラグ層を経由させて塩化銅として揮散させることによ
って解決している。[Means for Solving the Problems] In the present invention, the above problem is solved by forming a slag containing a molten iron alloy and an alkali or alkaline earth metal sulfide or sulfate, and adding an alkali or alkali to the slag. This problem is solved by adding earth metal chloride to volatilize Cu in the molten iron alloy through the slag layer as copper chloride.
【０００５】[0005]
【作用】本発明を実施するのに用いる設備の一例を図１
に示す。この設備の反応容器１には、処理対象の溶解炉
から供給される溶融鉄合金２が連続的に供給、排出され
る。 この反応容器１において、溶融鉄合金２は底吹き
ガス３によって撹拌される。底吹きには窒素のような非
酸化性のガスが用いられ、撹拌によってスラグ‐メタル
間反応を促進するのが目的である。ただし、底吹きが強
すぎてメタルがスラグによってカバーされなくなり露出
するようになると、雰囲気の塩素と溶融鉄の直接反応が
起こって好ましくない。したがって、メタル面の露出が
起きないように底吹きガス量とスラグ量の関係を調節す
る必要がある。溶融鉄合金のＣは３％以上にすることが
望ましい。その理由は、溶融鉄中のＣｕの活量係数を大
きくしてＣｕの除去効率をあげるためである。溶融鉄合
金に添加するフラックスは、溶融鉄合金中のＣｕと反応
させてＣｕを硫化銅とし、これをスラグに捕捉させるた
めのもので、アルカリ金属あるいはアルカリ土類金属の
硫化物の１種あるいは２種以上を含んでいることが必要
で、ＣａＳ系、Ｎａ２Ｓ系のものが用いられる。なお、
溶融鉄合金がＣを３％以上含有している条件では、ナト
リウムあるいはカルシウムの硫酸塩を加えた場合も硫酸
塩の分解が起こって硫化物が生成し、同様の効果が得ら
れる。スラグの精練能力、すなわち、スラグとメタル間
のＣｕの分配比は、スラグ中の硫化物活量に比例する。
なお、本発明においては、従来のバッチ処理とは異なり
、フラックスを添加して一旦スラグを生成させると、Ｃ
ｕはスラグに蓄積されずに最終的には揮散してしまうの
で、スラグ成分のうち変化したもの（特に硫化物ないし
は硫酸塩）をフラックス添加によって補充するだけでよ
い。以上のように、スラグと溶融鉄合金の反応により、
Ｃｕが溶融鉄合金からスラグに移行する。本発明におい
ては、このアルカリあるいはアルカリ土類金属の硫化物
ないしは硫酸塩を含むスラグ５にアルカリ金属、あるい
はアルカリ土類金属の塩化物４を添加し、該スラグによ
って溶融鉄合金と雰囲気とが遮断された状態で、塩素と
銅を接触反応させる。これによって、例えばＮａＣｌを
添加した場合、Ｃｕ２Ｓ＋２ＮａＣｌ→２ＣｕＣｌ↑＋
Ｎａ２Ｓ ・・・・・（１）の反応が起こり、ス
ラグの脱銅能を低下させないで、スラグからＣｕの除去
が行なわれる。[Operation] Figure 1 shows an example of equipment used to carry out the present invention.
Shown below. A molten iron alloy 2 supplied from a melting furnace to be treated is continuously supplied and discharged to a reaction vessel 1 of this equipment. In this reaction vessel 1, molten iron alloy 2 is stirred by bottom blowing gas 3. A non-oxidizing gas such as nitrogen is used for bottom blowing, and the purpose is to promote the reaction between slag and metal through stirring. However, if the bottom blow is so strong that the metal is no longer covered by the slag and becomes exposed, a direct reaction between the chlorine in the atmosphere and the molten iron will occur, which is undesirable. Therefore, it is necessary to adjust the relationship between the amount of bottom-blown gas and the amount of slag so that the metal surface is not exposed. It is desirable that the C content of the molten iron alloy be 3% or more. The reason for this is to increase the activity coefficient of Cu in molten iron and increase the efficiency of removing Cu. The flux added to the molten iron alloy is used to react with the Cu in the molten iron alloy to convert the Cu into copper sulfide, which is captured in the slag. It is necessary to contain two or more types, and CaS-based and Na2S-based ones are used. In addition,
Under conditions where the molten iron alloy contains 3% or more of C, when sodium or calcium sulfate is added, the sulfate decomposes and sulfide is produced, producing the same effect. The refining ability of the slag, that is, the distribution ratio of Cu between the slag and the metal, is proportional to the sulfide activity in the slag. In addition, in the present invention, unlike conventional batch processing, once flux is added and slag is generated, C
Since u is not accumulated in the slag and eventually volatilizes, it is only necessary to replenish changed slag components (especially sulfides or sulfates) by adding flux. As mentioned above, due to the reaction between slag and molten iron alloy,
Cu is transferred from the molten iron alloy to the slag. In the present invention, an alkali metal or alkaline earth metal chloride 4 is added to the slag 5 containing the alkali or alkaline earth metal sulfide or sulfate, and the slag blocks the molten iron alloy from the atmosphere. Under this condition, chlorine and copper undergo a contact reaction. By this, for example, when adding NaCl, Cu2S+2NaCl→2CuCl↑+
Na2S...The reaction (1) occurs, and Cu is removed from the slag without reducing the copper removal ability of the slag.
【０００６】[0006]
【実施例】図１に示すような設備を用い、表１に示す成
分、温度の溶融鉄合金を３０ｔ／ｈの速度で流した。EXAMPLE Using the equipment shown in FIG. 1, a molten iron alloy having the composition and temperature shown in Table 1 was flowed at a rate of 30 t/h.
【表１】
反応容器の共通操業条件は次の通りである。
初期の供給フラックス；Ｎａ２ＳＯ４ ２．３ｔ
連続供給フラックス ；Ｎａ２Ｓ（０．７ｔ／ｈ）＋
Ｎａ２ＳＯ４（０．３ｔ／ｈ）
底吹き条件； Ｎ２，ポーラスプラグを通して ５
００Ｎｍ３／ｈ
以上のような操業を行なったとき、各種の塩化物供給条
件における反応後のメタル中Ｃｕの経時変化を図２に示
す。塩化ソーダ、あるいは塩化カルシウムを添加した場
合に雰囲気中へのＣｕの揮発が進行し、定常的に溶融鉄
合金の脱Ｃｕが進むことがわかる。なお、脱Ｃｕ率が５
０％の場合の、鉄ロスは２％で、溶融鉄合金に直接塩素
を作用させる場合に比べると、鉄ロスは１／５以下に低
減している。また、硫化物添加だけの場合に比べて、フ
ラックスの原単位を１／３に低減できる。以上のように
、本発明を実施することによって、従来の硫化物スラグ
と接触させるだけの場合に見られる問題、並びに塩素を
直接、溶融鉄合金に接触させる場合に見られる問題の両
方を解決し、実用工程で脱Ｃｕ精練が可能となる。[Table 1] Common operating conditions for the reaction vessel are as follows. Initial supply flux; Na2SO4 2.3t
Continuous supply flux; Na2S (0.7t/h)+
Na2SO4 (0.3t/h) Bottom blowing conditions; N2, through porous plug 5
00 Nm3/h When the above-described operation was carried out, the time-dependent changes in Cu in the metal after reaction under various chloride supply conditions are shown in FIG. It can be seen that when sodium chloride or calcium chloride is added, the volatilization of Cu into the atmosphere progresses, and the removal of Cu from the molten iron alloy progresses steadily. In addition, the Cu removal rate is 5
In the case of 0%, the iron loss is 2%, which is reduced to 1/5 or less compared to when chlorine is directly applied to the molten iron alloy. Furthermore, compared to the case of only adding sulfide, the basic unit of flux can be reduced to 1/3. As described above, by carrying out the present invention, both the problems encountered when contacting only conventional sulfide slag and the problems encountered when chlorine is brought into direct contact with molten iron alloy can be solved. , it becomes possible to remove Cu in a practical process.
【０００７】[0007]
【発明の効果】本発明を実施することによって、Ｃｕを
不純物として含むスクラップを溶解して得られる溶融鉄
合金を効率的に脱Ｃｕすることができ、トランプエレメ
ント汚染の問題を解決できることから工業的な効果が大
きい。Effects of the Invention By carrying out the present invention, it is possible to efficiently remove Cu from the molten iron alloy obtained by melting scrap containing Cu as an impurity, and the problem of contamination of playing cards elements can be solved. The effect is great.
【０００８】[0008]
【図１】本発明を実施するのに用いる設備の一例を示す
図である。FIG. 1 is a diagram showing an example of equipment used to implement the present invention.
【図２】塩素源添加条件が連続排出される溶融鉄合金の
反応後メタル中％Ｃｕの変化に及ぼす影響を示す。FIG. 2 shows the influence of chlorine source addition conditions on the change in %Cu in the post-reaction metal of continuously discharged molten iron alloy.
１ 反応容器
２ 溶融鉄合金
３ 底吹きガス
４ アルカリ金属あるいはアルカリ土類金属の塩化物
５ アルカリあるいはアルカリ土類金属の硫化物な
いしは硫酸塩を含むスラグ。1 Reaction vessel 2 Molten iron alloy 3 Bottom blowing gas 4 Alkali metal or alkaline earth metal chloride 5 Slag containing alkali or alkaline earth metal sulfide or sulfate.
Claims (1)
ルカリ土類金属の硫化物、ないしは硫酸塩を含むスラグ
を形成せしめ、該スラグにアルカリあるいはアルカリ土
類金属の塩化物を添加することにより、溶融鉄合金中の
Ｃｕをスラグ層を経由させて塩化銅として拡散させるこ
とを特徴とする溶融鉄合金中のＣｕの除去方法。[Claim 1] Molten iron is produced by forming a slag containing a molten iron alloy and an alkali or alkaline earth metal sulfide or sulfate, and adding an alkali or alkaline earth metal chloride to the slag. A method for removing Cu from a molten iron alloy, which comprises diffusing Cu in the alloy as copper chloride through a slag layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2412793A JPH04221010A (en) | 1990-12-21 | 1990-12-21 | Method for removing cu in molten iron alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2412793A JPH04221010A (en) | 1990-12-21 | 1990-12-21 | Method for removing cu in molten iron alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04221010A true JPH04221010A (en) | 1992-08-11 |
Family
ID=18521562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2412793A Withdrawn JPH04221010A (en) | 1990-12-21 | 1990-12-21 | Method for removing cu in molten iron alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04221010A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008190011A (en) * | 2007-02-06 | 2008-08-21 | Chiba Inst Of Technology | Method for removing copper in form of copper iodide from copper-containing molten iron |
| JP2008190010A (en) * | 2007-02-06 | 2008-08-21 | Chiba Inst Of Technology | Method for removing copper from copper-containing molten iron |
| JP2010163650A (en) * | 2009-01-15 | 2010-07-29 | Jfe Steel Corp | Method for removing copper in molten pig iron |
| JP2011523979A (en) * | 2008-05-13 | 2011-08-25 | ソルト エクストラクション アクテボラグ | Method for chlorinating resources containing recoverable metals |
| IT201900010359A1 (en) | 2019-06-28 | 2020-12-28 | Danieli Off Mecc | METHOD OF REMOVING COPPER FROM STEEL AND RELATIVE ADDITIVE |
-
1990
- 1990-12-21 JP JP2412793A patent/JPH04221010A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008190011A (en) * | 2007-02-06 | 2008-08-21 | Chiba Inst Of Technology | Method for removing copper in form of copper iodide from copper-containing molten iron |
| JP2008190010A (en) * | 2007-02-06 | 2008-08-21 | Chiba Inst Of Technology | Method for removing copper from copper-containing molten iron |
| JP2011523979A (en) * | 2008-05-13 | 2011-08-25 | ソルト エクストラクション アクテボラグ | Method for chlorinating resources containing recoverable metals |
| JP2010163650A (en) * | 2009-01-15 | 2010-07-29 | Jfe Steel Corp | Method for removing copper in molten pig iron |
| IT201900010359A1 (en) | 2019-06-28 | 2020-12-28 | Danieli Off Mecc | METHOD OF REMOVING COPPER FROM STEEL AND RELATIVE ADDITIVE |
| WO2020260524A1 (en) | 2019-06-28 | 2020-12-30 | Danieli & C. Officine Meccaniche S.P.A. | Method to remove copper from steel, and corresponding additive |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980312 |