JPH11193411A - Refining method of molten low carbon iron - Google Patents
Refining method of molten low carbon ironInfo
- Publication number
- JPH11193411A JPH11193411A JP36843197A JP36843197A JPH11193411A JP H11193411 A JPH11193411 A JP H11193411A JP 36843197 A JP36843197 A JP 36843197A JP 36843197 A JP36843197 A JP 36843197A JP H11193411 A JPH11193411 A JP H11193411A
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- refining
- slag
- desulfurization
- vessel
- 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、溶融還元溶銑等の
ようなＣレベルが低い溶銑の精錬方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for refining hot metal having a low C level, such as molten reduced hot metal.
【０００２】[0002]
【従来の技術】鉄浴型溶融還元法により製造される溶銑
（以下、溶融還元溶銑という）は、Ｃレベルが４ｗｔ％
以下（通常、３ｗｔ％前後）と低いため融点が高い。す
なわち、一般の高炉溶銑の融点は１１５０℃程度である
と考えられるが、溶銑中のＣ量が１ｗｔ％違うと融点が
７０〜１００℃程度も違ってくるため、溶融還元溶銑等
のようなＣ量が３ｗｔ％レベルの溶銑では融点が１３０
０℃程度にもなる。そして、このようなＣレベルの低い
溶銑は、溶銑処理において樋や鍋等への地金・スラグの
付着が生じ易く、またこのことが溶銑処理を著しく困難
にする。2. Description of the Related Art Hot metal produced by an iron bath type smelting reduction method (hereinafter referred to as smelting reduced hot metal) has a C level of 4 wt%.
The melting point is high because it is low below (usually around 3 wt%). In other words, the melting point of general blast furnace hot metal is considered to be about 1150 ° C. However, if the amount of C in the hot metal differs by 1 wt%, the melting point also differs by about 70 to 100 ° C. The melting point of hot metal with a level of 3 wt% is 130
It will be around 0 ° C. Such hot metal having a low C level tends to cause ingots and slag to adhere to gutters, pans, and the like during hot metal processing, and this makes the hot metal processing extremely difficult.
【０００３】また、溶融還元溶銑のＳレベルは０．３〜
０．４ｗｔ％と高炉溶銑の約１０倍程度もある。このた
め一般に高炉溶銑に適用されているような炉外脱硫処理
法では、処理効率やコスト等の面でＳレベルを通常の薄
板等を製造するための製鋼プロセス向けとして０．０１
ｗｔ％以下まで低減させることは困難である。[0003] The S level of the molten reduced hot metal is 0.3 to
0.4 wt%, about 10 times that of blast furnace hot metal. For this reason, in the out-of-pile desulfurization treatment method generally applied to blast furnace molten iron, the S level is set at 0.01 in terms of treatment efficiency and cost for a steelmaking process for producing ordinary thin sheets and the like.
It is difficult to reduce it to not more than wt%.
【０００４】[0004]
【発明が解決しようとする課題】従来、溶融還元溶銑の
脱硫処理法としては、特開昭６３−３８５０７号公報に
溶融還元炉の出湯口に隣接して設けられた樋型容器で溶
銑をリンス処理する方法が提案されているが、この方法
は脱硫能力と処理効率が低く、これに伴う溶銑温度低
下、樋や鍋等への地金付着が大きな問題となり、また、
樋耐火物原単位の著しい増大を招くため好ましくない。Conventionally, as a desulfurization treatment method of molten reduced hot metal, Japanese Unexamined Patent Publication (Kokai) No. 63-38507 discloses a method of rinsing molten iron in a gutter-shaped vessel provided adjacent to the tap of a molten reduction furnace. Although a method of treating has been proposed, this method has a low desulfurization capacity and a low treatment efficiency, resulting in a decrease in hot metal temperature, adhesion of metal to a gutter or a pan, etc.
This is not preferable because it causes a significant increase in the gutter refractory basic unit.
【０００５】また、通常行われているような脱硫剤の所
謂パウダーインジェクション方式では脱硫剤原単位が１
００ｋｇ／ｔ以上必要となり、このような脱硫剤原単位
では経済的及び熱的にプロセスが成立しない。さらに、
機械撹拌操作による脱硫プロセスの場合にも、溶銑が温
度降下ししてきた場合に処理後の鍋への地金付着やスラ
グの凝固・付着を防ぐことができない。[0005] In a so-called powder injection system of a desulfurizing agent which is usually used, the desulfurizing agent basic unit is 1 unit.
It is required to be at least 00 kg / t, and such a unit of desulfurizing agent cannot economically and thermally establish a process. further,
Also in the case of the desulfurization process by the mechanical stirring operation, if the temperature of the hot metal falls, it is not possible to prevent the adhesion of the metal to the pot after treatment and the solidification and adhesion of the slag.
【０００６】一方、低Ｃである溶融還元溶銑のハンドリ
ングの困難性を軽減するため、特開平７−３１６６１８
号公報には溶融還元溶銑を高炉溶銑を合わせ湯し、しか
る後、脱硫処理等の予備精錬を行う溶銑処理方法が提案
されているが、この溶銑処理法は高炉と溶融還元炉を併
設した製鉄設備にしか適用できない。したがって本発明
の目的は、このような従来技術の課題を解決し、溶融還
元溶銑をはじめとする低炭素溶銑の脱硫処理を含めた精
錬を、溶銑温度の低下や地金付着等の問題を生じること
なく、効率的且つ経済的に行うことができる精錬方法を
提供することにある。[0006] On the other hand, in order to reduce the difficulty of handling molten iron with low C, Japanese Patent Application Laid-Open No. Hei 7-316618.
Japanese Patent Application Laid-Open No. H11-163873 proposes a hot metal treatment method in which molten smelt hot metal is combined with blast furnace hot metal, and then subjected to preliminary refining such as desulfurization treatment.This hot metal treatment method is an ironmaking method that includes a blast furnace and a smelting reduction furnace. Applicable only to equipment. Therefore, an object of the present invention is to solve the problems of the prior art and to perform refining including desulfurization treatment of low-carbon hot metal including smelting-reduced hot metal, causing problems such as lowering of hot metal temperature and metal adhesion. An object of the present invention is to provide a refining method that can be performed efficiently and economically without using any refining method.
【０００７】[0007]
【課題を解決するための手段】このような課題を解決す
るための本発明の特徴は以下の通りである。 [1] 出銑滓及び銑滓分離した後のＣ：４ｗｔ％以下の低
炭素溶銑を精錬する方法において、溶銑精錬容器内で溶
銑に脱硫剤を添加して撹拌することにより脱硫処理を行
う工程と、該脱硫処理前または脱硫処理後において前記
溶銑精錬容器または他の溶銑精錬容器で溶銑を加熱およ
び／または加炭する工程と、これらの工程を経た溶銑を
脱炭処理炉で脱炭処理する工程とを有することを特徴と
する低炭素溶銑の精錬方法。The features of the present invention for solving such a problem are as follows. [1] In a method of refining low carbon hot metal of 4 wt% or less after tapping slag and pig slag are separated, a step of performing a desulfurization treatment by adding a desulfurizing agent to the hot metal in a hot metal smelting vessel and stirring the hot metal. Heating and / or carburizing the hot metal in the hot metal refining vessel or another hot metal refining vessel before or after the desulfurization processing, and decarburizing the hot metal that has gone through these steps in a decarburization furnace. And a method for refining low carbon hot metal.
【０００８】[2] 上記[1]の精錬方法において、脱硫処
理において溶銑精錬容器内の溶銑に脱酸剤を添加するこ
とを特徴とする低炭素溶銑の精錬方法。 [3] 上記[1]または[2]の精錬方法において、溶銑を加熱
および／または加炭する工程を、アーク加熱機能とガス
バブリング機能を有する溶銑精錬容器で行うことを特徴
とする低炭素溶銑の精錬方法。 [4] 上記[1]または[2]の精錬方法において、溶銑を加熱
および／または加炭する工程を、酸素吹錬による加熱機
能と粉体インジェクションおよび／またはガスバブリン
グ機能を有する溶銑精錬容器で行うことを特徴とする低
炭素溶銑の精錬方法。[2] The refining method for low carbon hot metal according to the above [1], wherein a deoxidizing agent is added to the hot metal in the hot metal refining vessel in the desulfurization treatment. [3] In the refining method according to [1] or [2] above, the step of heating and / or carburizing the hot metal is performed in a hot metal refining vessel having an arc heating function and a gas bubbling function. Refining method. [4] In the refining method of the above [1] or [2], the step of heating and / or carburizing the hot metal is performed by a hot metal refining vessel having a heating function by oxygen blowing and a powder injection and / or gas bubbling function. A method for refining low carbon hot metal, comprising:
【０００９】[0009]
【発明の実施の形態】本発明の精錬方法はＣレベルが４
ｗｔ％以下の低炭素溶銑を対象とし、また、このような
低炭素溶銑のなかでもＳレベルが比較的高い溶銑（通
常、Ｓ：０．２ｗｔ％以上）の精錬にも好適に適用でき
る。一般に、このような低炭素溶銑、低炭素・高Ｓ溶銑
の代表例としては、溶融還元溶銑、一部スクラップ等の
固体鉄源を溶解させた溶融還元溶銑、所謂新鉄源（石炭
等の高Ｓの還元材を用いて製造された鉄源）の溶銑等が
挙げられるが、これら限定されるものではない。DESCRIPTION OF THE PREFERRED EMBODIMENTS The refining method of the present invention has a C level of 4
It is applicable to low-carbon hot metal of not more than wt%, and can be suitably applied to refining of hot metal having a relatively high S level (usually, S: 0.2 wt% or more) among such low-carbon hot metal. In general, typical examples of such low-carbon hot metal and low-carbon / high-S hot metal include smelting-reduced hot metal, smelting-reduced hot metal in which a solid iron source such as scrap is partially melted, so-called new iron source (high- Hot metal of iron source produced using a reducing material of S), and the like, but are not limited thereto.
【００１０】本発明は出銑滓及び銑滓分離した後の低炭
素溶銑の精錬方法であり、溶銑精錬容器内で溶銑に脱硫
剤とさらに必要に応じて脱酸剤を添加して撹拌すること
により脱硫処理を行う工程と、この脱硫処理前または脱
硫処理後において前記溶銑精錬容器または他の溶銑精錬
容器で溶銑を加熱および／または加炭する工程と、これ
らの工程を経た溶銑を脱炭処理炉で脱炭処理する工程と
を有する。The present invention relates to a method for refining low carbon hot metal after tapping slag and pig slag are separated. The method comprises adding a desulfurizing agent and, if necessary, a deoxidizing agent to the hot metal in a hot metal refining vessel and stirring the hot metal. A step of heating and / or carburizing the hot metal in the hot metal smelting vessel or another hot metal smelting vessel before or after the desulfurization processing, and decarburizing the hot metal having passed through these steps. Decarburizing in a furnace.
【００１１】図１の（ａ）及び（ｂ）は、それぞれ本発
明法を溶融還元溶銑の精錬に適用した実施形態の精錬フ
ローを示している。図１（ａ）の精錬フローでは、溶融
還元炉１から出銑滓された溶融還元溶銑とスラグを銑滓
分離した後、必要に応じてノロカキにより溶銑の残留ス
ラグを除去し、しかる後、溶銑を脱硫用の溶銑精錬容器
２に移し、脱硫剤と必要に応じて脱酸剤を投入して溶銑
を撹拌することにより脱硫処理を行う。FIGS. 1A and 1B show a refining flow of an embodiment in which the method of the present invention is applied to the refining of molten reduced hot metal. In the refining flow shown in FIG. 1 (a), after the slag is separated from the molten reduced hot metal discharged from the smelting reduction furnace 1 and the slag is removed, if necessary, the residual slag of the hot metal is removed by squeezing, and then the hot metal is removed. Is transferred to a hot metal refining vessel 2 for desulfurization, a desulfurizing agent and, if necessary, a deoxidizing agent are charged and the hot metal is stirred to perform a desulfurization treatment.
【００１２】この脱硫処理では、溶銑中のＳ量に応じて
溶銑当たり５〜３０ｋｇ／ｔ程度の脱硫剤が添加され
る。通常は２０ｋｇ／ｔ前後がメタルへの懸濁、混合を
効率的に行える添加量である。一般に、脱硫剤としては
ＣａＯを主成分とし、ＣａＦ2を５〜１０％程度、Ｃａ
Ｃｏ3を若干量含むもの等が用いられる。また、脱酸剤
は溶銑の酸素活量ａ0を下げて脱硫反応を促進するため
に添加されるもので、通常、脱酸剤としてはＡｌ、アル
ミックス、ＦｅＳｉやＳｉＭｎ等の合金鉄等が用いられ
る。一般に、脱酸剤は溶銑のヘンリー基準での酸素活量
ａ0が１／１０4以下、好ましくは１／１０5以下となる
ように添加すること好ましく、例えば、Ａｌの場合では
溶銑当たり０．５〜２ｋｇ／ｔ程度添加することが好ま
しい。In this desulfurization treatment, a desulfurizing agent of about 5 to 30 kg / t per hot metal is added in accordance with the amount of S in the hot metal. Usually, about 20 kg / t is an addition amount that enables the metal to be efficiently suspended and mixed. Generally, as a desulfurizing agent, CaO is a main component, CaF 2 is about 5 to 10%,
Those containing a small amount of Co 3 are used. Further, deoxidant intended to be added to promote desulfurization reaction by lowering the oxygen activity a 0 in the hot metal, usually as a deoxidizer Al, Al-mix, ferroalloys such as FeSi and SiMn is Used. In general, it is preferable to add the deoxidizing agent so that the oxygen activity a 0 of the hot metal based on Henry's standard is 1/10 4 or less, preferably 1/10 5 or less. It is preferable to add about 5 to 2 kg / t.
【００１３】この脱硫処理で行う撹拌はガス撹拌、機械
撹拌のいずれでもよいが、機械撹拌の方がガス撹拌に
較べて脱硫剤の溶銑中への分散性がよいこと、ガス撹
拌の場合には容器内で撹拌されない溶銑の淀み部を生じ
てしまうのに対して、機械撹拌の場合にはそのような淀
み部を生じにくいこと、等の理由から機械撹拌の方がよ
り強撹拌を実現できるので好ましい。図２は機械撹拌を
行うための溶銑精錬容器（機械撹拌式精錬装置）の一例
を示しており、同図の（Ｉ）は非稼働状態を、（ＩＩ）
は稼働状態を示している。この溶銑精錬容器２は溶銑の
撹拌を行う撹拌用インペラ５を備え、他にインペラ昇降
駆動装置、脱硫剤や脱酸剤投入用の投入装置、補助的に
集塵装置、測温・サンプリング装置（いずれも図示せ
ず）等を備えている。The stirring performed in the desulfurization treatment may be either gas stirring or mechanical stirring, but mechanical stirring has better dispersibility of the desulfurizing agent in the hot metal than gas stirring. Since mechanical stagnation occurs in the hot metal that is not stirred in the vessel, mechanical stirring can achieve stronger stirring because mechanical stagnation is less likely to occur. preferable. FIG. 2 shows an example of a hot metal smelting vessel (mechanical stirring type smelting apparatus) for performing mechanical stirring. In FIG.
Indicates an operating state. The hot metal smelting vessel 2 is provided with a stirring impeller 5 for stirring hot metal, an impeller raising / lowering drive device, a charging device for charging a desulfurizing agent or a deoxidizing agent, an auxiliary dust collecting device, a temperature measuring / sampling device ( Each of them is not shown).
【００１４】このような溶銑精錬容器２を用いた脱硫処
理では、容器内の溶銑に脱硫剤と必要に応じて脱酸剤を
投入し、溶銑浴面下に浸漬した撹拌用インペラ５を回転
させて、所要の撹拌力が得られるまで回転スピードを上
昇させ、その後、脱硫反応時間として３〜１５分程度の
撹拌を行う。例えば、溶銑精錬容器内の溶銑装入量が１
５０ｔの場合には、回転トルク：９００〜１０００ｋｇ
・ｍ、回転数：１００〜１１０ｒｐｍ程度の条件で撹拌
用インペラ５を作動させることにより、十分な脱硫処理
が可能である。また、撹拌用インペラ５は溶銑装入量が
上記よりも少ない小型の溶銑精錬容器の場合には上記の
条件よりも高速回転で、溶銑装入量が上記よりも多い大
型の溶銑精錬容器の場合には上記の条件よりも低速回転
で駆動させればよく、これにより上記と同様の処理効率
が得られる。In the desulfurization treatment using such a hot metal refining vessel 2, a desulfurizing agent and, if necessary, a deoxidizing agent are introduced into the hot metal in the vessel, and the stirring impeller 5 immersed under the hot metal bath is rotated. Then, the rotation speed is increased until a required stirring force is obtained, and thereafter, stirring is performed for about 3 to 15 minutes as a desulfurization reaction time. For example, if the amount of hot metal charged in the hot metal refining vessel is 1
In case of 50t, rotation torque: 900-1000kg
-By operating the stirring impeller 5 under the conditions of m and the number of rotations: about 100 to 110 rpm, a sufficient desulfurization treatment can be performed. In addition, when the impeller 5 for stirring is a small hot metal refining vessel in which the amount of hot metal charged is smaller than the above, the impeller 5 rotates at a higher speed than the above conditions, and in the case of a large hot metal refining vessel in which the charged quantity of hot metal is larger than the above. In this case, it is sufficient to drive at a lower rotation speed than the above condition, whereby the same processing efficiency as described above can be obtained.
【００１５】撹拌用インペラ５の作動状態としては、図
２の（ＩＩ）に示すように撹拌により生成する凹陥状の
浴面に撹拌用インペラ５の上部が露出し、撹拌用インペ
ラ５の上部が容器の上方から直接観察できる程度が好ま
しく、これにより脱硫剤が溶銑中に十分巻き込まれ、脱
硫剤と溶銑の撹拌が十分になされる。したがって、この
ような撹拌用インペラ５の作動状態が得られるようその
回転数を調整することが好ましい。また、ガス撹拌を行
なう場合には、単純なガス撹拌よりも脱硫剤の粉体イン
ジェクションを伴う方が粉体インジェクションによるエ
ネルギーを利用でき、強撹拌を実現できるので好まし
い。脱硫処理をガス撹拌で行う場合に使用される溶銑精
錬容器としては、例えばバブリングランスや底吹きノズ
ル等のガス吹き込み手段を備えた容器が用いられる。The operating state of the stirring impeller 5 is such that, as shown in FIG. 2 (II), the upper part of the stirring impeller 5 is exposed to the concave bath surface generated by stirring, and the upper part of the stirring impeller 5 is exposed. It is preferable that the desulfurizing agent is sufficiently involved in the hot metal so that the desulfurizing agent and the hot metal can be sufficiently stirred. Therefore, it is preferable to adjust the rotation speed of the stirring impeller 5 so as to obtain the operating state. Further, in the case of performing gas stirring, it is preferable to carry out powder stirring of a desulfurizing agent rather than simple gas stirring because the energy by powder injection can be utilized and strong stirring can be realized. As the hot metal refining vessel used when the desulfurization treatment is performed by gas stirring, a vessel provided with a gas blowing means such as a bubbling lance or a bottom blow nozzle is used.
【００１６】本発明の精錬法では、精錬の対象が溶融還
元溶銑のようにＳ量が高レベルの溶銑の場合には、脱硫
処理において脱硫剤とともに脱酸剤を添加した上で上述
した機械撹拌を伴うことが特に好ましく、これにより溶
銑中のＳが０．３〜０．４ｗｔ％という高レベルであっ
ても、これを０．０１ｗｔ％以下のレベル（通常の薄板
で要求されるＳレベル）まで短時間で効率的に低減させ
ることができる。溶融還元溶銑等のような低炭素・高Ｓ
溶銑は高炉溶銑とは異なってＳｉレベルが低く、Ｓｉが
脱酸剤として機能しないため脱硫剤のみの添加では脱硫
処理の効率が悪く、また、低炭素・高Ｓ溶銑は融点が高
く且つ脱硫の度合いも大きくなるため迅速且つ効率的な
脱硫処理が要求されるものであり、このため低炭素・高
Ｓ溶銑の脱硫処理においては脱硫剤とともに脱酸剤を添
加するとともに、撹拌性の優れた機械撹拌を行い、効率
的な脱硫処理を行うことが最も好ましい。In the refining method of the present invention, when the object of refining is hot metal having a high S content such as molten reduced hot metal, a desulfurizing agent and a deoxidizing agent are added in the desulfurizing treatment, and then the above-described mechanical stirring is performed. It is particularly preferable that, even if the S content in the hot metal is as high as 0.3 to 0.4 wt%, it is reduced to a level of 0.01 wt% or less (S level required for ordinary thin plates). Can be efficiently reduced in a short time. Low carbon and high S like smelting hot metal
Hot metal has a low Si level unlike blast furnace hot metal, and since Si does not function as a deoxidizing agent, the efficiency of desulfurization treatment is poor if only a desulfurizing agent is added, and low-carbon, high-S hot metal has a high melting point and high desulfurization efficiency. Because of the large degree, quick and efficient desulfurization is required. Therefore, in desulfurization of low carbon, high S hot metal, a deoxidizer is added together with a desulfurizer, It is most preferable to perform stirring and perform efficient desulfurization treatment.
【００１７】本発明法では、以上のような脱硫処理工程
の前または後に溶銑を加熱および／または加炭する工程
を実施し、溶銑の融点と溶銑温度との差を大きくする処
理を行なう。このような処理を行なうことにより、低炭
素溶銑の地金付着性を改善するとともに、脱炭処理等の
後工程における熱余裕を確保できる。この溶銑の加熱お
よび／または加炭工程は、前記脱硫処理を行う溶銑精錬
容器において脱硫処理と相前後して実施してもよいし、
或いは他の溶銑精錬容器で実施してもよい。In the method of the present invention, a step of heating and / or carburizing the hot metal is performed before or after the above desulfurization processing step, and a process of increasing the difference between the melting point of the hot metal and the hot metal temperature is performed. By performing such a treatment, it is possible to improve the metal adhesion of the low-carbon hot metal and to secure a heat margin in a post-process such as a decarburization treatment. This heating and / or carburizing step of the hot metal may be carried out immediately before and after the desulfurization treatment in the hot metal smelting vessel performing the desulfurization treatment,
Or you may implement in another hot metal smelting vessel.
【００１８】このような溶銑の加熱および／または加炭
工程を脱硫処理工程後に行った場合には、同工程を脱硫
処理工程前に行うよりも昇温レベルを低くできるため、
熱ロスが小さく且つ容器の耐火物やバブリングランスの
損耗を低く抑えることができる。一方、溶銑の加熱およ
び／または加炭工程を脱硫処理工程前に行った場合に
は、出銑滓の際に銑滓分離し切れなかったホットスラグ
をそのまま加熱用のスラグとして利用でき、当該工程で
投入すべき造滓剤の全部または一部の代替とすることが
できる。このため造滓剤原単位や燃料原単位を低減でき
る。When the step of heating and / or carburizing the hot metal is performed after the desulfurization step, the temperature raising level can be lower than that performed before the desulfurization step.
The heat loss is small, and the wear of the refractory and the bubbling lance of the container can be suppressed low. On the other hand, if the hot metal heating and / or carburizing step is performed before the desulfurization treatment step, the hot slag that has not been completely separated at the time of tapping can be used as it is as the heating slag. Can replace all or part of the slag-making agent to be charged. Therefore, it is possible to reduce the basic unit of the slag forming agent and the basic unit of the fuel.
【００１９】図１（ａ）の精錬フローでは、溶銑精錬容
器２で脱硫処理された溶銑を溶銑精錬容器３に移し、溶
銑の加熱および／または加炭工程を実施する。一方、図
１（ｂ）の精錬フローでは、溶銑精錬容器２における脱
硫処理工程の前に溶銑の加熱および／または加炭工程が
実施される。すなわち、銑滓分離された溶銑を、必要に
応じてノロカキにより溶銑の残留スラグを除去した後、
溶銑精錬容器３に受け、ここで溶銑の加熱および／また
は加炭工程を実施した後、溶銑精錬容器２で脱炭処理を
実施する。なお、このような処理は溶銑の加熱および／
または加炭を目的として行うものであるが、同時に脱燐
処理等を実施したり或いは事実上脱燐反応や脱硫反応を
伴う精錬がなされることを妨げない。In the refining flow of FIG. 1A, the hot metal desulfurized in the hot metal refining vessel 2 is transferred to the hot metal refining vessel 3, and the hot metal is heated and / or carburized. On the other hand, in the refining flow of FIG. 1B, the heating and / or carburizing step of the hot metal is performed before the desulfurization processing step in the hot metal refining vessel 2. That is, after removing the hot metal separated from the iron slag, if necessary, by removing the residual slag of the hot metal by squeezing,
After being received in the hot metal smelting vessel 3, where the hot metal is heated and / or carburized, a decarburization process is performed in the hot metal smelting vessel 2. In addition, such treatment is performed by heating the hot metal and / or
Alternatively, it is carried out for the purpose of carburizing, but does not prevent simultaneous dephosphorization treatment or refining accompanied by dephosphorization reaction or desulfurization reaction.
【００２０】溶銑を加熱および／または加炭する工程で
の加熱昇温量、加炭量は溶銑の融点、後工程での熱余裕
等を考慮して決められる。加炭する場合の加炭レベルは
通常０．１〜１ｗｔ％程度であり、特に０．５ｗｔ％以
上加炭することにより、転炉等で行われる後工程の脱炭
処理においてスクラップ配合比の自由度が増すため好ま
しい。また、溶銑の加熱を行った場合であっても、処理
の態様（例えば、脱燐処理を同時に行う場合）によって
は、処理後の溶銑温度が処理前よりも低くなる場合があ
るが、この場合は溶銑の加熱により溶銑の温度低下分の
一部が補償されているものであり、溶銑の融点からみた
場合の熱余裕を大きくすることが本工程（溶銑の加熱お
よび／または加炭工程）の目的であるため、本発明には
このようなケースも含まれる。The heating temperature and / or the amount of carburizing in the step of heating and / or carburizing the hot metal are determined in consideration of the melting point of the hot metal, the heat allowance in the subsequent steps, and the like. The carburizing level in the case of carburizing is usually about 0.1 to 1 wt%, and in particular, by carburizing not less than 0.5 wt%, the scrap mixing ratio can be freely set in the decarburization treatment in the subsequent process performed in a converter or the like. It is preferable because the degree increases. In addition, even when the hot metal is heated, the hot metal temperature after the treatment may be lower than before the treatment, depending on the mode of the treatment (for example, when performing the dephosphorization treatment at the same time). Is that part of the temperature drop of the hot metal is compensated for by the heating of the hot metal, and it is important to increase the heat margin when viewed from the melting point of the hot metal in this process (hot metal heating and / or carburizing process). For purposes, the present invention includes such cases.
【００２１】溶銑の加熱および／または加炭工程は、ア
ーク加熱機能とガスバブリング機能とを有する溶銑精錬
容器か、若しくは酸素吹錬による加熱機能と粉体インジ
ェクションおよび／またはガスバブリング機能を有する
溶銑精錬容器で行うことが好ましい。前者の溶銑精錬容
器としては、所謂ＬＦ法として知られている溶銑処理で
用いられる取鍋精錬設備を用いることができ、また、後
者の溶銑精錬容器としては、所謂ＮＲＰ法として知られ
ている溶銑処理で用いられる溶銑処理設備を用いること
ができる。The heating and / or carburizing step of the hot metal is performed by a hot metal refining vessel having an arc heating function and a gas bubbling function, or a hot metal refining having a heating function by oxygen blowing and a powder injection and / or gas bubbling function. It is preferably performed in a container. As the former hot metal refining vessel, a ladle refining facility used in hot metal processing known as the so-called LF method can be used, and as the latter hot metal refining vessel, there is used the hot metal refining vessel known as the so-called NRP method. Hot metal processing equipment used in the processing can be used.
【００２２】図３はアーク加熱機能とガスバブリング機
能とを有する溶銑精錬容器３ａの一例を示すもので、６
は電極（３相黒鉛電極）、７はバブリングランスであ
り、通常、このバブリングランス７はガスバブリングだ
けでなく粉体インジェクションを行うこともできる。こ
の図３に示す溶銑精錬容器３ａでは、溶銑当たり１０〜
２０ｋｇ／ｔ程度の溶融スラグ（ＣａＯ／ＳｉＯ2：１
〜４程度）の存在下で、バブリングランス７から溶銑中
にＮ2やＡｒ等の不活性ガスを吹き込んでガスバブリン
グしつつ、先端部がスラグ中に浸漬した電極６によるア
ーク加熱により溶銑を加熱昇温させる。バブリングガス
量は特に限定されないが、一般に溶銑当たり０．００１
〜０．０１Ｎｍ3／ｔ／ｍｉｎ程度とすればよい。FIG. 3 shows an example of a hot metal refining vessel 3a having an arc heating function and a gas bubbling function.
Is an electrode (a three-phase graphite electrode), and 7 is a bubbling lance. Usually, the bubbling lance 7 can perform not only gas bubbling but also powder injection. In the hot metal smelting vessel 3a shown in FIG.
About 20 kg / t of molten slag (CaO / SiO 2 : 1
In the presence of 程度 4), the hot metal is heated by arc heating by the electrode 6 whose tip is immersed in the slag while gas bubbling is performed by blowing an inert gas such as N 2 or Ar into the hot metal from the bubbling lance 7. Raise the temperature. The amount of bubbling gas is not particularly limited, but is generally 0.001 per hot metal.
It may be about 0.01 Nm 3 / t / min.
【００２３】この処理工程で使用するスラグは、造滓剤
（通常、ＣａＯを主成分とする造滓剤）を投入すること
により生成してもよいし、或いは投入される造滓剤の全
部または一部の代替として、溶銑とともに持ちこまれた
製銑残留スラグを利用してもよい。また、この処理工程
では、必要に応じて加炭のための炭材や温度調整のため
の冷却材を投入してもよい。このような炭材、造滓剤、
冷材等の供給は投入装置を利用して重力落下させてもよ
いが、バブリングランス７からインジェクションしても
よい。一般にこのような溶銑精錬容器３による溶銑の加
熱および／または加炭工程では、同時に脱硫反応も進行
する。The slag used in this processing step may be produced by adding a slag-forming agent (usually a slag-forming agent mainly composed of CaO), or may be produced by adding all or a whole of the slag-making agent to be supplied. As some alternatives, residual ironmaking slag brought with the hot metal may be used. In this processing step, a carbonaceous material for carburizing and a coolant for temperature adjustment may be added as necessary. Such carbon materials, slag-making agents,
The supply of the cold material or the like may be performed by gravity drop using a charging device, or may be injected from the bubbling lance 7. In general, in the heating and / or carburizing step of the hot metal in the hot metal refining vessel 3, a desulfurization reaction also proceeds at the same time.
【００２４】また、図４は酸素吹錬による加熱機能と粉
体インジェクションおよび／またはガスバブリング機能
を有する溶銑精錬容器の一例を示すもので、８は送酸ラ
ンス、９は粉体インジェクションとガスバブリングを行
うことができるバブリングランスである。この図４に示
す溶銑精錬容器では、溶銑当たり１０〜２０ｋｇ／ｔ程
度の溶融スラグ（ＣａＯ／ＳｉＯ2：１〜４程度）の存
在下で、バブリングランス９から溶銑中にＮ2等の不活
性ガスを吹き込んでガスバブリングしつつ、送酸ランス
８から酸素吹錬（酸素ないし酸素含有ガスの吹き込み）
を行うことで溶銑を加熱昇温させるか、または、送酸ラ
ンス８からの酸素吹錬を行いつつ、この酸素吹錬による
溶銑中Ｃの低下を補償するために、さらに好ましくは溶
銑の融点を下げるためにバブリングランス９を通じて炭
材をインジェクションし、加炭を行う。FIG. 4 shows an example of a hot metal refining vessel having a heating function by oxygen blowing and a powder injection and / or gas bubbling function, wherein 8 is an acid lance, 9 is powder injection and gas bubbling. Is a bubbling lance. In the hot metal smelting vessel shown in FIG. 4, in the presence of molten slag (CaO / SiO 2 : about 1 to 4) of about 10 to 20 kg / t per hot metal, inert gas such as N 2 is introduced into the hot metal from the bubbling lance 9. Oxygen blowing from oxygen lance 8 (injection of oxygen or oxygen-containing gas) while blowing gas and bubbling gas.
In order to compensate for a decrease in C in the hot metal due to the oxygen blowing while heating or raising the temperature of the hot metal or performing oxygen blowing from the acid lance 8, it is more preferable to set the melting point of the hot metal to Carbon material is injected through the bubbling lance 9 for lowering, and carburizing is performed.
【００２５】また、このバブリングランス９を通じたイ
ンジェクションは、炭材だけでなく造滓剤や冷材の投入
にも利用できる。また、バブリングランス９によるバブ
リングガス量や送酸ランス８による酸素吹錬量は特に限
定されないが、一般にバブリングガス量は溶銑当たり
０．０５〜０．２Ｎｍ3／ｔ／ｍｉｎ程度、送酸量は溶
銑当たり５〜１０Ｎｍ3／ｔ程度とすればよい。The injection through the bubbling lance 9 can be used not only for charging a carbon material but also for charging a slag-making agent or a cold material. The amount of bubbling gas by the bubbling lance 9 and the amount of oxygen blown by the acid lance 8 are not particularly limited, but the amount of bubbling gas is generally about 0.05 to 0.2 Nm 3 / t / min per hot metal, and the amount of acid It may be about 5 to 10 Nm 3 / t per hot metal.
【００２６】この処理工程で使用するスラグについて
も、造滓剤（通常、ＣａＯを主成分とする造滓剤）を投
入することにより生成してもよいし、或いは投入される
造滓剤の全部または一部の代替として、溶銑とともに持
ちこまれた製銑残留スラグを利用してもよい。このよう
な溶銑の加熱および／または加炭工程では、酸素吹錬を
行うため脱燐反応と脱硫反応も同時進行することが期待
される。なお、この図４に示す溶銑精錬容器を用いた処
理では、温度調整のために固体酸素源としてのミルスケ
ールや酸化鉄、鉱石、焼結鉱、Ｍｎ鉱石等を投入するこ
とができ、例えばＭｎ鉱石を投入した場合には溶銑中の
Ｍｎ量を増大させることができる。The slag used in this treatment step may be produced by adding a slag-forming agent (usually a slag-forming agent mainly composed of CaO), or may be produced entirely by adding the slag-forming agent. Alternatively, as an alternative, ironmaking residual slag brought with the hot metal may be used. In such a heating and / or carburizing process of the hot metal, it is expected that the dephosphorization reaction and the desulfurization reaction simultaneously proceed because oxygen blowing is performed. In the treatment using the hot metal smelting vessel shown in FIG. 4, mill scale, iron oxide, ore, sintered ore, Mn ore, or the like can be added as a solid oxygen source for temperature adjustment. When ore is charged, the amount of Mn in the hot metal can be increased.
【００２７】以上述べた脱硫処理工程および溶銑の加熱
および／または加炭工程を含む一連の処理を経た溶銑
は、引き続き脱炭処理工程に送られるが、脱硫処理工程
（但し、溶銑の加熱及び／または加炭工程でも脱硫反応
が生じる場合には、この工程も含む）のスラグが脱炭処
理工程に持ちこまれるとスラグからの復硫を生じるた
め、少なくとも脱硫処理工程でのスラグが脱炭処理工程
に持ちこまれないような態様でスラグ除去（ノロカキ）
を行う必要がある。The hot metal that has gone through a series of processes including the above-described desulfurization process and the process of heating and / or carburizing the hot metal is continuously sent to the decarburization process, but the desulfurization process (however, the heating and / or If the desulfurization reaction also occurs in the carburizing step, this step is included), and if the slag is brought into the decarburization step, resulfurization from the slag occurs, so at least the slag in the desulfurization step is converted to the decarburization step. Slag removal in a manner not to be carried over
Need to do.
【００２８】したがって、図１（ａ）の精錬フローにお
いては、少なくとも溶銑精錬容器２による脱硫処理工程
後かまたは溶銑精錬容器３による加熱及び／または加炭
工程後にスラグ除去を行うことが、また、図１（ｂ）の
精錬フローにおいては、少なくとも溶銑精錬容器２によ
る脱硫処理工程後にスラグ除去を行うことが、それそれ
必須の条件となる。また、脱硫処理工程に低塩基度のス
ラグが持ちこまれると高脱硫効率が得られないため、脱
硫処理工程前の低塩基度のスラグも除去することが好ま
しい。Therefore, in the refining flow of FIG. 1A, slag is removed at least after the desulfurization treatment step by the hot metal refining vessel 2 or after the heating and / or carburizing step by the hot metal refining vessel 3. In the refining flow shown in FIG. 1B, it is an essential condition that slag is removed at least after the desulfurization treatment step using the hot metal refining vessel 2. In addition, if low basicity slag is brought into the desulfurization treatment step, high desulfurization efficiency cannot be obtained. Therefore, it is preferable to remove low basicity slag before the desulfurization treatment step.
【００２９】上記の一連の処理を経た溶銑を転炉や電気
炉等の脱炭処理炉４に送り、脱炭処理を行う。この脱炭
処理は常法に従って実施してよい。なお、上記の一連の
工程の途中で溶銑温度が液相線以下に低下すると予測さ
れる場合には、上述したうちの適当な工程途中または工
程間において溶銑を鋳銑機に送って冷銑を製造し、この
冷銑を溶融還元炉または脱炭処理炉に装入することが好
ましい。この場合、冷銑の形状は比較的小さいことが好
ましく、その大きさ（径）を１００ｍｍ以下、より好ま
しくは５０ｍｍ以下とするのがよい。The hot metal that has undergone the above-described series of processing is sent to a decarburization processing furnace 4 such as a converter or an electric furnace to perform decarburization processing. This decarburization treatment may be performed according to a conventional method. If the hot metal temperature is predicted to drop below the liquidus in the middle of the above series of processes, the hot metal is sent to the cast iron machine during the appropriate process or between It is preferable to manufacture and charge this cold iron into a smelting reduction furnace or a decarburization furnace. In this case, the shape of the cold pig is preferably relatively small, and its size (diameter) is preferably 100 mm or less, more preferably 50 mm or less.
【００３０】[0030]
【実施例】［実施例１］図１（ｂ）に示す精錬フローに
従い、以下に述べるような溶融還元溶銑の精錬処理を行
った。すなわち、溶融還元炉１から出銑滓された溶融還
元溶銑とスラグを銑滓分離した後、ノロカキにより溶銑
の残留スラグを除去し、しかる後、溶銑を図４に示す溶
銑精錬容器３に移して生石灰を主成分としＣａＯ／Ｓｉ
Ｏ2が略３前後（２〜４）に調整された造滓剤を１２ｋ
ｇ／ｔ投入するとともに、酸素吹錬と１０ｋｇ／ｔの炭
材（コークス）及び脱燐剤（ＣａＯ：８４％、ＣａＣＯ
3：１０％、ＣａＦ2：６％）等のインジェクションを行
い、溶銑の加熱と加炭（さらに、脱燐処理）を行った。
次いで、溶銑を図２に示すような撹拌インペラを備えた
溶銑精錬容器２に移して脱硫剤（生石灰：１９ｋｇ／
ｔ、蛍石：１ｋｇ／ｔ）と脱酸剤（Ａｌ：２ｋｇ／ｔ）
を添加し、機械撹拌による脱硫処理を行った。次いで、
ノロカキにより溶銑の脱硫滓を除去した後、溶銑を脱炭
処理炉４（電気炉）に移し、脱炭処理を行った。[Example 1] According to the refining flow shown in FIG. 1 (b), a smelting process of molten hot metal as described below was performed. That is, after slag is separated from the slag from the smelting reduction furnace 1 and the slag is removed from the slag, the residual slag of the hot metal is removed by squeezing and then the hot metal is transferred to the hot metal refining vessel 3 shown in FIG. Quicklime as main component and CaO / Si
12k of slag-making agent with O 2 adjusted to about 3 (2-4)
g / t, oxygen blowing, 10 kg / t carbon material (coke) and dephosphorizer (CaO: 84%, CaCO
(3 : 10%, CaF 2 : 6%), etc., and the hot metal was heated and carburized (furthermore, dephosphorization treatment).
Next, the hot metal was transferred to a hot metal refining vessel 2 equipped with a stirring impeller as shown in FIG. 2 and a desulfurizing agent (quick lime: 19 kg /
t, fluorite: 1 kg / t) and deoxidizer (Al: 2 kg / t)
Was added and desulfurization treatment was performed by mechanical stirring. Then
After removing the desulfurized slag of the hot metal by squeezing, the hot metal was transferred to a decarburization furnace 4 (electric furnace) to be decarburized.
【００３１】表１に各工程前後での溶銑温度及び溶銑中
[Ｃ]、[Ｐ]、[Ｓ]と各工程での処理時間を示す。同表に
よれば、本発明の精錬法により低炭素・高Ｓ溶銑である
溶融還元溶銑を短時間で効率的に精錬処理できることが
判る。また、一連の工程においては、溶銑の地金付着等
も全く生じなかった。Table 1 shows the hot metal temperature before and after each process and the hot metal content.
[C], [P], and [S] show the processing time in each step. According to the table, it can be seen that the smelting method of the present invention can efficiently and smelt the molten reduced hot metal which is a low carbon and high S hot metal in a short time. In addition, in the series of steps, the adhesion of the molten metal to the metal did not occur at all.
【００３２】[0032]
【表１】 [Table 1]
【００３３】［実施例２］図１（ａ）に示す精錬フロー
に従い、以下に述べるような溶融還元溶銑の精錬処理を
行った。すなわち、溶融還元炉１から出銑滓された溶融
還元溶銑とスラグを銑滓分離した後、ノロカキにより溶
銑の残留スラグを除去し、しかる後、溶銑を図２に示す
ような撹拌インペラを有する溶銑精錬容器２に移して脱
硫剤（生石灰：１９ｋｇ／ｔ、蛍石：１ｋｇ／ｔ）と脱
酸剤（Ａｌ：２ｋｇ／ｔ）を添加し、機械撹拌による脱
硫処理を行った。次いで、ノロカキにより溶銑の脱硫滓
を除去した後、溶銑を図３に示すような溶銑精錬容器３
に移し、生石灰を主成分としＣａＯ／ＳｉＯ2が１．５
に調整された造滓剤を１０ｋｇ／ｔ、炭材（コークス）
を７ｋｇ／ｔ投入し、造滓剤中に電極を浸漬してアーク
加熱することにより造滓剤を溶解させ、さらに溶銑の加
熱と加炭を行った。また、浴の伝熱促進・偏熱防止のた
めに、処理中バブリングランスからＮ2ガスを０．００
４Ｎｍ3／ｔ／ｍｉｎ吹込んだ。Example 2 According to the refining flow shown in FIG. 1 (a), the following smelting process was performed on molten reduced hot metal. That is, after the slag is separated from the slag from the smelting reduction furnace 1 by hot slag, the residual slag of the hot metal is removed by squeezing, and then the hot metal is heated with a stirring impeller as shown in FIG. After being transferred to the refining vessel 2, a desulfurizing agent (quick lime: 19 kg / t, fluorite: 1 kg / t) and a deoxidizing agent (Al: 2 kg / t) were added, and a desulfurization treatment by mechanical stirring was performed. Next, after removing the desulfurized slag of the hot metal with a squeezer, the hot metal is poured into a hot metal refining vessel 3 as shown in FIG.
And CaO / SiO 2 containing 1.5% lime as a main component
10kg / t of slag-making agent adjusted to 10g, carbon material (coke)
Was charged at 7 kg / t, the electrode was immersed in the slag-making agent, and the slag-making agent was melted by arc heating, and the hot metal was heated and carburized. Further, in order to promote heat transfer of the bath and to prevent uneven heat transfer, 0.002 N 2 gas was supplied from the bubbling lance during the treatment.
4 Nm 3 / t / min was blown.
【００３４】表２に各工程前後での溶銑温度及び溶銑中
[Ｃ]、[Ｐ]、[Ｓ]と各工程での処理時間を示す。同表に
よれば、本発明の精錬法により低炭素・高Ｓ溶銑である
溶融還元溶銑を短時間で効率的に精錬処理できることが
判る。また、一連の工程においては、溶銑の地金付着等
も全く生じなかった。Table 2 shows the hot metal temperature before and after each process and the hot metal
[C], [P], and [S] show the processing time in each step. According to the table, it can be seen that the smelting method of the present invention can efficiently and smelt the molten reduced hot metal which is a low carbon and high S hot metal in a short time. In addition, in the series of steps, the adhesion of the molten metal to the metal did not occur at all.
【００３５】[0035]
【表２】 [Table 2]
【００３６】[0036]
【発明の効果】以上述べたように本発明の精錬方法によ
れば、溶融還元溶銑等のような低炭素溶銑の脱硫処理を
含めた精錬を、溶銑温度の低下や地金付着等の問題を生
じることなく、効率的且つ経済的に実施することができ
る。As described above, according to the refining method of the present invention, refining including desulfurization treatment of low carbon hot metal such as smelted hot metal can be used to solve problems such as lowering of hot metal temperature and adhesion of ingot. It can be implemented efficiently and economically without any occurrence.
【図１】本発明法の実施形態の精錬フローを示す説明図FIG. 1 is an explanatory diagram showing a refining flow of an embodiment of the method of the present invention.
【図２】本発明法において、脱硫処理工程で用いられる
機械撹拌方式の溶銑精錬容器の一実施形態およびこれに
よる精錬状況を示す説明図FIG. 2 is an explanatory view showing one embodiment of a mechanical stirring type hot metal refining vessel used in a desulfurization treatment step in the method of the present invention and a state of refining by this.
【図３】本発明法において、溶銑の加熱および／または
加炭工程で用いられる溶銑精錬容器の一実施形態を示す
説明図FIG. 3 is an explanatory view showing one embodiment of a hot metal refining vessel used in the process of heating and / or carburizing hot metal in the method of the present invention.
【図４】本発明法において、溶銑の加熱および／または
加炭工程で用いられる溶銑精錬容器の他の実施形態を示
す説明図FIG. 4 is an explanatory view showing another embodiment of a hot metal refining vessel used in the process of heating and / or carburizing hot metal in the method of the present invention.
１…溶融還元炉、２，３，３ａ，３ｂ…溶銑精錬容器、
４…脱炭処理炉、５…撹拌インペラ、６…電極、７…バ
ブリングランス、８…送酸ランス、９…バブリングラン
ス1 ... smelting reduction furnace, 2, 3, 3a, 3b ... hot metal smelting vessel,
4 Decarburization furnace, 5 Stirring impeller, 6 Electrode, 7 Bubbling lance, 8 Acid lance, 9 Bubbling lance
───────────────────────────────────────────────────── フロントページの続き (72)発明者 澤田 輝俊 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 関口 毅 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 渡部 雅之 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Terutoshi Sawada 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Inventor Takeshi Sekiguchi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan (72) Inventor Masayuki Watanabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.
Claims (4)
％以下の低炭素溶銑を精錬する方法において、溶銑精錬
容器内で溶銑に脱硫剤を添加して撹拌することにより脱
硫処理を行う工程と、該脱硫処理前または脱硫処理後に
おいて前記溶銑精錬容器または他の溶銑精錬容器で溶銑
を加熱および／または加炭する工程と、これらの工程を
経た溶銑を脱炭処理炉で脱炭処理する工程とを有するこ
とを特徴とする低炭素溶銑の精錬方法。1. C: 4 wt.% After separation of tapping slag and pig slag
% Or less in the method of refining low carbon hot metal in a hot metal refining vessel by adding a desulfurizing agent to the hot metal in a hot metal refining vessel and stirring the hot metal, and before or after the desulfurization processing, the hot metal refining vessel or A method for refining low-carbon hot metal, comprising: a step of heating and / or carburizing hot metal in another hot metal refining vessel; and a step of decarburizing the hot metal that has gone through these steps in a decarburization furnace.
に脱酸剤を添加することを特徴とする請求項１に記載の
低炭素溶銑の精錬方法。2. The method for refining low carbon hot metal according to claim 1, wherein a deoxidizing agent is added to the hot metal in the hot metal refining vessel in the desulfurization treatment.
を、アーク加熱機能とガスバブリング機能を有する溶銑
精錬容器で行うことを特徴とする請求項１または２に記
載の低炭素溶銑の精錬方法。3. The method for refining low carbon hot metal according to claim 1, wherein the step of heating and / or carburizing the hot metal is performed in a hot metal refining vessel having an arc heating function and a gas bubbling function. .
を、酸素吹錬による加熱機能と粉体インジェクションお
よび／またはガスバブリング機能を有する溶銑精錬容器
で行うことを特徴とする請求項１または２に記載の低炭
素溶銑の精錬方法。4. The method of claim 1, wherein the step of heating and / or carburizing the hot metal is performed in a hot metal refining vessel having a heating function by oxygen blowing and a powder injection and / or gas bubbling function. 2. The method for refining low carbon hot metal according to item 1.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36843197A JPH11193411A (en) | 1997-12-26 | 1997-12-26 | Refining method of molten low carbon iron |
| IDW20001412A ID26484A (en) | 1997-12-26 | 1998-12-24 | METHOD OF PURPLE IRON PURPLE AND PURPLE REDUCTION METHOD TO PRODUCE PASS IRON |
| BR9814479-0A BR9814479A (en) | 1997-12-26 | 1998-12-24 | "method for refining cast iron and method for reducing castings for the production of cast iron" |
| AU16877/99A AU755341B2 (en) | 1997-12-26 | 1998-12-24 | Refining method of molten iron and reduction smelting method for producing the molten iron |
| CA002315031A CA2315031A1 (en) | 1997-12-26 | 1998-12-24 | Refining method of molten iron and smelting reduction method for producing molten iron |
| PCT/JP1998/005852 WO1999034022A1 (en) | 1997-12-26 | 1998-12-24 | Refining method of molten iron and reduction smelting method for producing the molten iron |
| CN98812533A CN1283222A (en) | 1997-12-26 | 1998-12-24 | Refining method of molten iron and reduction smelting method for producing molten iron |
| TW87121601A TW467955B (en) | 1997-12-26 | 1998-12-24 | Refining method of molten iron and reduction smelting method for producing molten iron |
| KR10-2000-7006438A KR100370920B1 (en) | 1997-12-26 | 1998-12-24 | Refining method of molten iron and reduction smelting method for producing the molten iron |
| US09/974,511 US6837916B2 (en) | 1997-12-26 | 2001-10-10 | Smelting reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36843197A JPH11193411A (en) | 1997-12-26 | 1997-12-26 | Refining method of molten low carbon iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11193411A true JPH11193411A (en) | 1999-07-21 |
Family
ID=18491804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36843197A Pending JPH11193411A (en) | 1997-12-26 | 1997-12-26 | Refining method of molten low carbon iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11193411A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012041598A (en) * | 2010-08-18 | 2012-03-01 | Nippon Steel Corp | Method for desulfurizing molten iron |
| KR101424643B1 (en) * | 2013-04-03 | 2014-08-01 | 주식회사 포스코 | Method for manufacturing cast metal pin iron |
-
1997
- 1997-12-26 JP JP36843197A patent/JPH11193411A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012041598A (en) * | 2010-08-18 | 2012-03-01 | Nippon Steel Corp | Method for desulfurizing molten iron |
| KR101424643B1 (en) * | 2013-04-03 | 2014-08-01 | 주식회사 포스코 | Method for manufacturing cast metal pin iron |
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