JPH07207316A - Wire for desulfurization of molten iron having high desulfurization efficiency - Google Patents
Wire for desulfurization of molten iron having high desulfurization efficiencyInfo
- Publication number
- JPH07207316A JPH07207316A JP464094A JP464094A JPH07207316A JP H07207316 A JPH07207316 A JP H07207316A JP 464094 A JP464094 A JP 464094A JP 464094 A JP464094 A JP 464094A JP H07207316 A JPH07207316 A JP H07207316A
- Authority
- JP
- Japan
- Prior art keywords
- wire
- hot metal
- alloy
- desulfurization
- sheath
- 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- Withdrawn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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶銑脱硫に消費される
Ｍｇの割合を高めた溶銑脱硫用ワイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot metal desulfurizing wire in which the proportion of Mg consumed for hot metal desulfurization is increased.
【０００２】[0002]
【従来の技術】高炉から出銑された溶銑は、比較的多量
の不純物を含んでいる。この溶銑を転炉で精錬するに先
立って、脱Ｓｉ，脱Ｓ，脱Ｐ等の各種処理が施されてい
る。特に、溶銑に含まれるＳは、鋼材の加工性や耐食性
を低下させる原因となることから、溶銑段階で低レベル
まで下げることが必要である。溶銑の脱硫には、取鍋，
混銑車等に収容された溶銑に脱硫剤を添加する方式が採
用されている。脱硫剤には、ＣａＯ，ＣａＣ2 ，Ｎａ2
ＣＯ3 ，金属Ｍｇ，希土類金属等が使用されている。た
とえば、特開平３−３０１４６１号公報は、金属Ｍｇ粉
末及びＣａＣ2 粉末を含むフラックスを溶銑にガスイン
ジェクションする脱硫方法を紹介している。なかでも、
金属Ｍｇ又はＭｇ合金は、溶銑の［Ｓ］に対する反応性
が高いことから、効率的な脱硫剤として検討されてい
る。しかし、沸点が低く活性な元素であるＭｇは、溶銑
に接触すると同時に爆発的に気化反応を生じ易い。その
結果、反応によって金属Ｍｇが溶銑に対する脱硫作用を
呈さなくなるばかりでなく、脱硫処理を危険な作業にす
る。2. Description of the Related Art The hot metal tapped from a blast furnace contains a relatively large amount of impurities. Prior to refining the hot metal in a converter, various processes such as Si removal, S removal, and P removal are performed. In particular, S contained in the hot metal causes the workability and corrosion resistance of the steel material to decrease, so it is necessary to reduce it to a low level at the hot metal stage. For desulfurization of hot metal, ladle,
A method of adding a desulfurizing agent to the hot metal contained in a hot metal truck or the like is adopted. The desulfurizing agent includes CaO, CaC 2 , Na 2
CO 3 , metal Mg, rare earth metal, etc. are used. For example, Japanese Patent Application Laid-Open No. 3-301461 introduces a desulfurization method in which a flux containing a metal Mg powder and a CaC 2 powder is gas-injected into hot metal. Above all,
Metal Mg or Mg alloy is considered as an efficient desulfurizing agent because of its high reactivity with [S] of hot metal. However, Mg, which has a low boiling point and is an active element, is liable to explode and vaporize at the same time when it contacts the hot metal. As a result, not only does the metal Mg not exhibit the desulfurization action on the hot metal due to the reaction, but also the desulfurization treatment becomes a dangerous operation.
【０００３】[0003]
【発明が解決しようとする課題】溶銑に添加されたＭｇ
は、Ｍｇ（ｇ）＋［Ｓ］→ＭｇＳ（ｓ）及びＭｇ（ｌ）
＋［Ｓ］→ＭｇＳ（ｓ）の脱硫反応に従って溶銑中の
［Ｓ］と反応し、反応生成物ＭｇＳをスラグに移行させ
ることにより溶銑を脱硫する。この脱硫反応は、他の脱
硫剤を使用した場合に比較し、溶銑の［Ｓ］を極めて低
いレベルまで下げることに有効である。しかし、ガスイ
ンジェクション方式によるとき、溶銑に吹き込まれたＭ
ｇのうち、Ｍｇ蒸気となったものがキャリアガスによっ
て希釈され、脱硫に寄与するＭｇ蒸気の割合が低下す
る。また、ガスインジェクション方式では、溶銑の深部
に脱硫剤が送り込まれるようにキャリアガスの圧力を高
く設定し、溶銑との反応性を高めるためＭｇ系脱硫剤を
細粒にしている。高圧のキャリアガスは、脱硫剤の吹込
みに有効であるものの、無数の気泡となって溶銑中を上
昇し系外に放出される。他方、蒸気圧が大きなＭｇは、
細粒になるほど短時間でＭｇ蒸気になる。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Is Mg (g) + [S] → MgS (s) and Mg (l)
+ [S] → MgS (s) reacts with [S] in the hot metal according to the desulfurization reaction, and the reaction product MgS is transferred to slag to desulfurize the hot metal. This desulfurization reaction is effective in reducing the [S] of the hot metal to an extremely low level as compared with the case of using other desulfurizing agents. However, when using the gas injection method, M blown into the hot metal
Of g, what became Mg vapor is diluted with the carrier gas, and the proportion of Mg vapor that contributes to desulfurization decreases. Further, in the gas injection method, the pressure of the carrier gas is set high so that the desulfurizing agent is sent to the deep part of the hot metal, and the Mg-based desulfurizing agent is made into fine particles in order to enhance the reactivity with the hot metal. Although the high-pressure carrier gas is effective for blowing in the desulfurizing agent, it becomes an infinite number of bubbles and rises in the hot metal to be discharged out of the system. On the other hand, Mg, which has a large vapor pressure,
The finer the particles, the sooner the vapor becomes Mg vapor.
【０００４】そのため、吹き込まれたＭｇ系脱硫剤が未
反応状態の蒸気として系外に持ち去られる傾向が強く、
脱硫効率が依然として低い値を示す。また、Ｍｇは、溶
銑に含まれている［Ｏ］と反応して脱硫能のないＭｇＯ
となることによっても、反応効率を低下させる。本発明
は、このような問題を解消すべく案出されたものであ
り、溶銑の深部まで供給可能なワイヤ状で脱硫剤を使用
すると共に、脱酸剤を同時添加することにより、反応生
成物ＭｇＳがＭｇＳ＋［Ｏ］→ＭｇＯ＋［Ｓ］の反応に
よって再び溶銑中に［Ｓ］が戻ることを抑え、高い効率
でＭｇを脱硫反応に利用することを目的とする。Therefore, the injected Mg-based desulfurizing agent has a strong tendency to be carried out of the system as unreacted vapor,
The desulfurization efficiency is still low. Further, Mg reacts with [O] contained in the hot metal and has no desulfurization ability.
Also reduces the reaction efficiency. The present invention has been devised to solve such a problem, and by using a desulfurizing agent in the form of a wire that can be supplied to the deep portion of the hot metal, and by simultaneously adding a deoxidizing agent, the reaction product The purpose of the present invention is to suppress the return of [S] into the hot metal again due to the reaction of MgS by MgS + [O] → MgO + [S], and utilize Mg in the desulfurization reaction with high efficiency.
【０００５】[0005]
【課題を解決するための手段】本発明の溶銑脱硫用ワイ
ヤは、その目的を達成するため、粉末状，粒状，カット
ワイヤ状又は線材状のＭｇ又はＭｇ合金を、脱酸能の高
い物質と共にシースに収容し、或いは脱酸能が高い金属
又は合金のシースで被覆したワイヤである。脱硫反応及
び脱酸反応を考慮するとき、Ｍｇ又はＭｇ合金を中心に
配置し、その周囲を脱酸能の高い物質で取り囲むことが
好ましい。この溶銑脱硫用ワイヤは、更にＭｇＳ吸収能
が高い物質を含むこともできる。脱酸能が高い物質とし
ては、Ａｌ，Ａｌ合金の他に、Ｚｒ，Ｈｆ，Ｙ，希土類
金属等があるが、溶銑中に残留しても除去又は無害化が
容易で且つ処理コストを低く抑える上から、Ａｌ又はＡ
ｌ合金が好適である。Ａｌ又はＡｌ合金は、粉末状，粒
状，カットワイヤ状又は線材状でシースに収容される。In order to achieve the object, the wire for hot metal desulfurization of the present invention comprises a powdery, granular, cut wire or wire-like Mg or Mg alloy together with a substance having a high deoxidizing ability. The wire is housed in a sheath or covered with a metal or alloy sheath having high deoxidizing ability. When considering the desulfurization reaction and the deoxidation reaction, it is preferable to dispose Mg or a Mg alloy in the center and surround the periphery with a substance having a high deoxidizing ability. The hot metal desulfurization wire may further contain a substance having a high MgS absorption capacity. Examples of substances having high deoxidizing ability include Zr, Hf, Y, and rare earth metals in addition to Al and Al alloys. However, even if they remain in the hot metal, they can be easily removed or made harmless and the processing cost can be kept low. From the top, Al or A
1 alloy is preferred. The Al or Al alloy is contained in the sheath in the form of powder, particles, cut wire or wire.
【０００６】ＭｇＳ吸収能が高い物質としては、ＣａＯ
−Ａｌ2 Ｏ3 系，ＣａＯ−Ａｌ2 Ｏ3 −ＳｉＯ2 系，Ｃ
ａＯ−ＣａＦ2 系，ＣａＣＯ3 −ＣａＦ2 系フラックス
等がある。これらのフラックスは、脱酸能が高い物質と
配合され、或いはＭｇ又はＭｇ合金にコーティングされ
る。本発明に従った溶銑脱硫用ワイヤは、図１に示すよ
うに種々の形態でＭｇ又はＭｇ合金を脱酸能の高い金属
又は合金と組み合せることができる。図１（ａ）は、Ｍ
ｇ又はＭｇ合金１を脱酸能のある金属又は合金２と共
に、鉄製のシース３に挿入した溶銑脱硫用ワイヤであ
る。シース３には、更に脱硫能及び／又は脱酸能のある
フラックス４を必要に応じて充填する。フラックス４で
十分な復硫抑制能が得られるとき、図１（ｂ）に示すよ
うに、Ｍｇ又はＭｇ合金１をシース３に充填した構成を
とることもできる。Ａｌ又はＡｌ合金製のシース３を使
用するとき、フラックス４の充填を省略できる。この場
合には、Ｍｇ又はＭｇ合金１とシース３との間に隙間が
生じないように、コーティング，クラッド等によってＭ
ｇ又はＭｇ合金にシース３を密着させることが好まし
い。或いは、フラックス４をコーティングしたＭｇ又は
Ｍｇ合金１をシース３に充填又は挿入しても良い。[0006] As a substance having a high MgS absorption ability, CaO
-Al 2 O 3 system, CaO-Al 2 O 3 -SiO 2 system, C
aO-CaF 2 system, there is a CaCO 3 -CaF 2-based flux or the like. These fluxes are mixed with a substance having a high deoxidizing ability or coated on Mg or a Mg alloy. The hot metal desulfurization wire according to the present invention can combine Mg or Mg alloy with a metal or alloy having high deoxidizing ability in various forms as shown in FIG. FIG. 1A shows M
This is a wire for hot metal desulfurization in which a g or Mg alloy 1 is inserted into a sheath 3 made of iron together with a metal or alloy 2 having a deoxidizing ability. The sheath 3 is further filled with a flux 4 having a desulfurizing ability and / or a deoxidizing ability, if necessary. When the flux 4 has a sufficient ability to suppress vulcanization, a sheath 3 may be filled with Mg or Mg alloy 1 as shown in FIG. 1B. When using the sheath 3 made of Al or Al alloy, the filling of the flux 4 can be omitted. In this case, the M or Mg alloy 1 and the sheath 3 are coated with M or the like so that a gap is not formed between them.
It is preferable that the sheath 3 is closely attached to g or Mg alloy. Alternatively, Mg or Mg alloy 1 coated with flux 4 may be filled or inserted in the sheath 3.
【０００７】鉄製のシース３は、溶銑脱硫用ワイヤを溶
銑に送り込むとき、ワイヤ先端の溶落ちを溶銑の浴深部
とする点で有効である。溶込み深さは、鉄製シース３の
厚みで調整できる。Ａｌ又はＡｌ合金製のシース３は、
鉄製シース３に比較して溶銑に脱流用ワイヤを迅速に溶
融させる上で有用である。また、未溶解のシースが溶銑
の湯面に堆積し、精錬反応の妨げになったり、処理後の
ハンドリングに支障を来すことも、Ａｌ又はＡｌ合金製
シース３の使用により解消される。脱酸能の高い物質
は、溶銑の［Ｏ］と反応して、脱硫反応域を酸素ポテン
シャルの低い状態にする。この作用を考慮するとき、脱
酸能の高い物質が溶銑に先ず反応し、次いでＭｇ又はＭ
ｇ合金が溶銑に接触するように、Ｍｇ又はＭｇ合金をワ
イヤの中心に配置することが好ましい。図１（ｃ）で
は、Ｍｇ又はＭｇ合金製芯線５とシース３との間の環状
間隙にフラックス４を充填している。フラックス４とし
ては、たとえば脱酸能が高く且つＭｇＳ吸収能をもつＣ
ａＯ−Ａｌ2 Ｏ3 系，ＣａＯ−Ａｌ2 Ｏ3 −ＳｉＯ2 系
等が使用される。Ａｌ又はＡｌ合金のシース３を使用す
るとき、ＭｇＳ吸収能を高くすることを重点においてフ
ラックス４を成分調整することができる。脱酸能が高い
Ａｌ又はＡｌ合金は、コーティング層６とすることな
く、たとえば図１（ｄ）に示すように、Ｍｇ又はＭｇ合
金製芯線５の周囲に複数本配置されたＡｌ又はＡｌ合金
製線材６として使用してもよい。この場合、Ｆｅ系シー
ス又はＡｌ系シースの使用が可能である。The iron sheath 3 is effective in that when the hot metal desulfurizing wire is fed into the hot metal, the burn-through at the tip of the wire becomes the bath depth of the hot metal. The penetration depth can be adjusted by the thickness of the iron sheath 3. The sheath 3 made of Al or Al alloy is
This is useful in rapidly melting the degassing wire into the hot metal as compared with the iron sheath 3. Further, the use of the sheath 3 made of Al or Al alloy eliminates the problem that the unmelted sheath is deposited on the hot metal surface of the hot metal, hinders the refining reaction, and hinders the handling after the treatment. A substance having a high deoxidizing ability reacts with [O] of the hot metal to bring the desulfurization reaction zone into a state of low oxygen potential. Considering this action, a substance with high deoxidizing ability first reacts with the hot metal and then Mg or M
The Mg or Mg alloy is preferably placed in the center of the wire so that the g alloy contacts the hot metal. In FIG. 1C, the flux 4 is filled in the annular gap between the Mg or Mg alloy core wire 5 and the sheath 3. As the flux 4, for example, C having high deoxidizing ability and MgS absorbing ability is used.
aO-Al 2 O 3 system, CaO-Al 2 O 3 -SiO 2 system or the like is used. When the sheath 3 of Al or Al alloy is used, the composition of the flux 4 can be adjusted by focusing on increasing the MgS absorption capacity. The Al or Al alloy having a high deoxidizing ability is formed of a plurality of Al or Al alloys arranged around the Mg or Mg alloy core wire 5 as shown in FIG. 1D without forming the coating layer 6. You may use it as the wire 6. In this case, it is possible to use an Fe-based sheath or an Al-based sheath.
【０００８】[0008]
【作用】本発明の溶銑脱硫用ワイヤは、溶銑の脱酸反応
に消費される割合を抑えてＭｇ又はＭｇ合金の優れた脱
酸能を活用するため、脱酸能が高い物質を配合してい
る。脱酸能が高い物質は、たとえばＡｌ＋［Ｏ］→Ａｌ
2 Ｏ3 の反応に従って溶銑の［Ｏ］を減少させ、酸素ポ
テンシャルが低下した溶銑に対するＭｇの接触を可能に
する。したがって、Ｍｇ＋［Ｏ］→ＭｇＯとして消費さ
れるＭｇが少なく、Ｍｇ＋［Ｓ］→ＭｇＳの反応が効率
よく進行する。特にＭｇ又はＭｇ合金の周囲に脱酸能が
高い物質を充填又はコーティングした溶銑脱硫用ワイヤ
は、脱硫反応に先立って脱酸反応が進行するため、Ｍｇ
の有効消費効率が一層高くなる。The hot metal desulfurization wire of the present invention contains a substance having a high deoxidizing ability in order to utilize the excellent deoxidizing ability of Mg or Mg alloy while suppressing the rate of consumption of the hot metal in the deoxidizing reaction. There is. A substance having a high deoxidizing ability is, for example, Al + [O] → Al.
The [O] of the hot metal is reduced according to the reaction of 2 O 3 , and the contact of Mg with the hot metal having a reduced oxygen potential is enabled. Therefore, the amount of Mg consumed as Mg + [O] → MgO is small, and the reaction of Mg + [S] → MgS proceeds efficiently. In particular, in a hot metal desulfurization wire in which a material having high deoxidizing ability is filled or coated around Mg or a Mg alloy, the deoxidation reaction proceeds prior to the desulfurization reaction.
The effective consumption efficiency of is further increased.
【０００９】Ｍｇ又はＭｇ合金は、周囲がシースで覆わ
れているので、雰囲気中の酸素や水分による悪影響を受
けず、脱硫反応に有効に消費される。シースに収容され
ているＭｇ源は、溶銑の湯面に到達する前に溶銑からの
輻射熱で気化することもある。しかし、生成したＭｇ蒸
気は、シース内に閉じ込められているので、ワイヤの送
給に従って溶銑内部に逐次送り込まれる。溶銑脱流用ワ
イヤに配合されるＭｇＳ吸収能が高い物質は、溶銑と接
触した後、湯面に浮上する。この過程で、たとえば低融
点ＣａＯ−Ａｌ2 Ｏ3 系フラックスは、脱硫反応で生じ
たＭｇＳを吸収し、湯面に浮遊するフラックス層とな
る。ＭｇＳは本来不安定な物質であり、ＭｇＳ＋Ｏ2 →
ＭｇＯ＋［Ｓ］の復硫反応が生じ易いものであるが、フ
ラックス層に吸収させることにより復硫反応が抑制され
る。また、ＭｇＳが脱硫反応域から取り除かれるため、
Ｍｇ＋［Ｓ］→ＭｇＳの反応も促進される。Since Mg or a Mg alloy is covered with a sheath around it, it is not adversely affected by oxygen and moisture in the atmosphere and is effectively consumed in the desulfurization reaction. The Mg source contained in the sheath may be vaporized by the radiant heat from the hot metal before reaching the molten metal surface of the hot metal. However, since the generated Mg vapor is confined in the sheath, it is successively fed into the hot metal as the wire is fed. The substance having a high MgS absorption capacity, which is blended with the hot metal drainage wire, floats on the molten metal surface after contact with the hot metal. In this process, for example, low-melting CaO-Al 2 O 3 based flux absorbs MgS produced in the desulfurization reaction, a flux layer floating on the molten metal surface. MgS is an originally unstable substance, and MgS + O 2 →
Although the MgO + [S] re-sulfurization reaction is likely to occur, the re-sulfurization reaction is suppressed by absorbing it in the flux layer. Also, since MgS is removed from the desulfurization reaction zone,
The reaction of Mg + [S] → MgS is also promoted.
【００１０】[0010]
【実施例】次の構造を持つ溶銑脱硫用ワイヤを用意し
た。 Ｍｇ合金粉末及びＡｌ粉末を鉄系シースに充填した
ワイヤ（図１ａ） 外径６ｍｍ及び肉厚０．２ｍｍの普通鋼製シースに、平
均粒径２００μｍの金属Ｍｇと平均粒径２００μｍ及び
純度９９％のＡｌ合金粉末とを、それぞれ１４ｇ／ｍ及
び３２．５ｇ／ｍの割合で充填した。また、融点が１２
６５℃で組成がＣａＯ：３７％，Ａｌ2 Ｏ3 ：２０％及
びＳｉＯ2 ：４３％のフラックスを４０ｇ／ｍの割合で
充填した。 Ｍｇ合金粉末及びフラックスをＡｌシースに充填し
たワイヤ（図１ｂ） 肉厚０．３ｍｍのＡｌ合金１１００製シースに、ワイヤ
と同じ金属Ｍｇ及びフラックスをそれぞれ１４ｇ／ｍ
及び４０ｇ／ｍの割合で充填した。Example A hot metal desulfurization wire having the following structure was prepared. Wire in which an iron-based sheath is filled with Mg alloy powder and Al powder (Fig. 1a) In a normal steel sheath having an outer diameter of 6 mm and a wall thickness of 0.2 mm, a metal Mg having an average particle diameter of 200 µm, an average particle diameter of 200 µm, and a purity of 99%. And Al alloy powder of (4) were filled at a rate of 14 g / m and 32.5 g / m, respectively. Also, the melting point is 12
At 65 ° C., a flux having a composition of CaO: 37%, Al 2 O 3 : 20% and SiO 2 : 43% was filled at a rate of 40 g / m. Wire in which Al alloy sheath is filled with Mg alloy powder and flux (Fig. 1b) A sheath of Al alloy 1100 with a thickness of 0.3 mm is filled with the same metal Mg and flux as the wire, 14 g / m 2 respectively.
And 40 g / m.
【００１１】 Ｍｇ合金ワイヤを中心に配置したワイ
ヤ（図１ｃ） 外径６ｍｍ及び肉厚０．３ｍｍのＡｌ製シースに直径
４．５ｍｍのＭｇ合金ワイヤを挿入し、シースとの間に
ＭｇＳ吸収能のあるＣａＯ５０％−Ａｌ2 Ｏ3 ５０％の
フラックスを４０ｇ／ｍの割合で充填した。 Ｍｇ合金芯線の回りに複数本のＡｌ合金線材を配置
したワイヤ（図１ｄ） 外径６ｍｍ及び肉厚０．２ｍｍの普通鋼製シースにＭｇ
合金芯線を挿入し、Ｍｇ合金芯線を中心として直径１ｍ
ｍ及び純度９９％のＡｌ線材を同心円状に６本配置し
た。そして、シース内の空隙を、ＣａＯ：３７％，Ａｌ
2 Ｏ3 ：２０％及びＳｉＯ2 ：４３％の組成を持つフラ
ックスで充填した。 脱酸能のある物質を含まないワイヤ（比較例） ワイヤと同じ組成及び粒径のＭｇ粉末を、ＣａＯ：５
０％−Ａｌ2 Ｏ3 ：５０％のフラックスと共に、外径６
ｍｍ及び肉厚０．２ｍｍの普通鋼製シースに充填した。
Ｍｇ粉末及びフラックスの充填量は、それぞれ１４ｇ／
ｍ及び４０ｇ／ｍとした。Wire centered on Mg alloy wire (FIG. 1 c) A Mg alloy wire having a diameter of 4.5 mm is inserted into an Al sheath having an outer diameter of 6 mm and a wall thickness of 0.3 mm, and the MgS absorbing ability is maintained between the sheath and the sheath. A flux of CaO 50% -Al 2 O 3 50% was filled at a rate of 40 g / m. A wire in which a plurality of Al alloy wires are arranged around a Mg alloy core wire (Fig. 1d). A plain steel sheath having an outer diameter of 6 mm and a wall thickness of 0.2 mm is Mg.
Insert the alloy core wire and center the Mg alloy core wire for a diameter of 1 m
Six Al wire rods each having m and a purity of 99% were arranged concentrically. Then, the voids in the sheath are CaO: 37%, Al
It was filled with a flux having a composition of 2 O 3 : 20% and SiO 2 : 43%. Wire containing no substance capable of deoxidizing (Comparative Example) Mg powder having the same composition and particle diameter as the wire was used, CaO: 5
0% -Al 2 O 3: with 50 percent of the flux, an outer diameter of 6
mm and a wall thickness of 0.2 mm were filled into a plain steel sheath.
The filling amount of Mg powder and flux is 14 g /
m and 40 g / m.
【００１２】高炉から出銑された温度１３２０℃の溶銑
を取鍋に収容し、各溶銑脱硫用ワイヤを８０ｍ／分の供
給速度で送り込み、初期濃度［Ｓ］inが０．０２０重量
％の溶銑を脱硫した。脱硫開始から１０分後に溶銑の
［Ｓ］fiを測定し、脱硫率（＝［Ｓ］in−［Ｓ］fi）／
［Ｓ］in×１００）％を算出した。脱硫後の溶銑温度は
１３１０℃であり、脱硫による温度降下は１０℃に過ぎ
なかった。そのため、後続する工程での熱負荷が軽減さ
れた。脱硫率は、表１に示すように溶銑脱硫用ワイヤの
種類に応じて変化した。本発明に従ったワイヤ〜を
使用した溶銑脱硫では、脱酸能のある物質を含まないワ
イヤに比較し脱硫率が大幅に改善されていた。これ
は、溶銑の［Ｏ］がＡｌと反応し、Ａｌ2 Ｏ3 として脱
硫反応域から取り除かれ、Ｍｇ＋［Ｓ］→ＭｇＳの脱硫
反応にＭｇが効率よく消費されたことを示す。なお、表
１におけるＭｇ，Ａｌは脱硫用ワイヤに含まれるＭｇ，
Ａｌ分を基準としてｋｇ／トン−溶銑で、［Ｓ］in，
［Ｓ］fiは重量％で、脱硫率は％で表す。Hot metal having a temperature of 1320 ° C. tapped from the blast furnace was placed in a ladle, and each hot metal desulfurizing wire was fed at a feed rate of 80 m / min to obtain a hot metal having an initial concentration [S] in of 0.020% by weight. Was desulfurized. [S] fi of the hot metal was measured 10 minutes after the desulfurization was started, and the desulfurization rate (= [S] in − [S] fi ) /
[S] in × 100)% was calculated. The hot metal temperature after desulfurization was 1310 ° C, and the temperature drop due to desulfurization was only 10 ° C. Therefore, the heat load in the subsequent process was reduced. As shown in Table 1, the desulfurization rate changed depending on the type of hot metal desulfurization wire. In the hot metal desulfurization using the wire according to the present invention, the desulfurization rate was significantly improved as compared with the wire containing no substance capable of deoxidizing. This indicates that [O] of the hot metal was reacted with Al and removed as Al 2 O 3 from the desulfurization reaction zone, and Mg was efficiently consumed in the desulfurization reaction of Mg + [S] → MgS. Note that Mg and Al in Table 1 are Mg and Al contained in the desulfurization wire.
Kg / ton-hot metal, based on Al content, [S] in ,
[S] fi is represented by weight% and the desulfurization rate is represented by%.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】以上に説明したように、本発明の溶銑脱
硫用ワイヤは、脱硫能が高いＭｇ又はＭｇ合金と脱酸能
が高い物質とを含んでいる。このワイヤを溶銑に送り込
むと、溶銑中の［Ｏ］が脱酸能の高い物質と反応し脱硫
反応域から除去されるため、酸素ポテンシャルの低い溶
銑にＭｇ又はＭｇ合金が接触する。そのため、Ｍｇ＋
［Ｏ］→ＭｇＯとして消費される割合が少なく、高い反
応効率で溶銑の脱硫反応にＭｇが消費される。また、Ｍ
ｇ＋［Ｓ］→ＭｇＳの迅速な脱硫反応と相俟つて、大幅
な温度降下をきたすことなく高効率で溶銑が脱硫され
る。このようにして、［Ｓ］を極めて低下した高品質の
溶銑が得られ、後続する工程に対する熱負荷も軽減され
る。As described above, the hot metal desulfurizing wire of the present invention contains Mg or a Mg alloy having a high desulfurizing ability and a substance having a high deoxidizing ability. When this wire is fed into the hot metal, [O] in the hot metal reacts with a substance having a high deoxidizing ability and is removed from the desulfurization reaction zone, so that Mg or a Mg alloy comes into contact with the hot metal having a low oxygen potential. Therefore, Mg +
The ratio of [O] → MgO is small, and Mg is consumed in the desulfurization reaction of the hot metal with high reaction efficiency. Also, M
In combination with the rapid desulfurization reaction of g + [S] → MgS, the hot metal is desulfurized with high efficiency without causing a large temperature drop. In this way, high-quality hot metal with a significantly reduced [S] is obtained, and the heat load on the subsequent steps is also reduced.
【図１】 本発明実施例で使用した各種溶銑脱硫用ワイ
ヤFIG. 1 Various hot metal desulfurization wires used in Examples of the present invention
１：Ｍｇ又はＭｇ合金 ２：脱酸用金属 ３：シー
ス ４：フラックス ５：Ｍｇ又はＭｇ合金製芯線 ６：Ａｌ又はＡｌ合金線材1: Mg or Mg alloy 2: Deoxidizing metal 3: Sheath 4: Flux 5: Mg or Mg alloy core wire 6: Al or Al alloy wire rod
Claims (6)
状のＭｇ又はＭｇ合金が、脱酸能の高い物質と共にシー
スに収容されている溶銑脱硫用ワイヤ。1. A hot metal desulfurization wire in which a powdery, granular, cut wire-shaped or wire-shaped Mg or Mg alloy is housed in a sheath together with a substance having a high deoxidizing ability.
し、該ワイヤとシースとの間に脱酸能の高い物質が配置
されている溶銑脱硫用ワイヤ。2. A hot metal desulfurization wire, in which a wire made of Mg or a Mg alloy is arranged at the center, and a substance having a high deoxidizing ability is arranged between the wire and the sheath.
スである溶銑脱硫用ワイヤ。3. A hot metal desulfurization wire, wherein the sheath according to claim 1 or 2 is an iron sheath.
高い金属又は合金製のシースである溶銑脱硫用ワイヤ。4. A hot metal desulfurization wire, wherein the sheath according to claim 1 or 2 is a metal or alloy sheath having a high deoxidizing ability.
ットワイヤ状又は線材状のＡｌ又はＡｌ合金である請求
項１〜４の何れかに記載の溶銑脱硫用ワイヤ。5. The hot metal desulfurization wire according to any one of claims 1 to 4, wherein the substance having a high deoxidizing ability is powdery, granular, cut wire-shaped or wire-shaped Al or an Al alloy.
系，ＣａＯ−Ａｌ2Ｏ3 −ＳｉＯ2 系，ＣａＯ−ＣａＦ2
系及びＣａＣＯ3 −ＣａＦ2 系から選ばれた１種又は
２種以上のフラックスが更に配合又はコーティングされ
ている請求項１〜４の何れかに記載の溶銑脱硫用ワイ
ヤ。6. CaO—Al 2 O 3 having high MgS absorption capacity.
System, CaO-Al 2 O 3 -SiO 2 system, CaO-CaF 2
The hot metal desulfurization wire according to any one of claims 1 to 4, further comprising one or two or more fluxes selected from the group consisting of CaCO 3 and CaCO 3 -CaF 2 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP464094A JPH07207316A (en) | 1994-01-20 | 1994-01-20 | Wire for desulfurization of molten iron having high desulfurization efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP464094A JPH07207316A (en) | 1994-01-20 | 1994-01-20 | Wire for desulfurization of molten iron having high desulfurization efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07207316A true JPH07207316A (en) | 1995-08-08 |
Family
ID=11589594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP464094A Withdrawn JPH07207316A (en) | 1994-01-20 | 1994-01-20 | Wire for desulfurization of molten iron having high desulfurization efficiency |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07207316A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007031810A (en) * | 2005-07-29 | 2007-02-08 | Jfe Steel Kk | Desulfurizing treatment method for molten iron |
| JP2007254843A (en) * | 2006-03-24 | 2007-10-04 | Jfe Steel Kk | Molten iron desulfurization treatment method |
| JP2008095136A (en) * | 2006-10-10 | 2008-04-24 | Jfe Steel Kk | Metal band coated desulfurization wire, and method for desulfurizing molten iron |
| JP2013147693A (en) * | 2012-01-18 | 2013-08-01 | Osaka Kohai Kk | Refining agent |
| KR20140070086A (en) * | 2012-11-30 | 2014-06-10 | 인젝션 알로이스 리미티드 | Wire for refining molten metal and associated method of manufacture |
| KR101475321B1 (en) * | 2012-12-21 | 2014-12-22 | (주)에스엔엔씨 | Method for desulfurizing molten ferronickel |
-
1994
- 1994-01-20 JP JP464094A patent/JPH07207316A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007031810A (en) * | 2005-07-29 | 2007-02-08 | Jfe Steel Kk | Desulfurizing treatment method for molten iron |
| JP4715369B2 (en) * | 2005-07-29 | 2011-07-06 | Ｊｆｅスチール株式会社 | Hot metal desulfurization treatment method |
| JP2007254843A (en) * | 2006-03-24 | 2007-10-04 | Jfe Steel Kk | Molten iron desulfurization treatment method |
| JP2008095136A (en) * | 2006-10-10 | 2008-04-24 | Jfe Steel Kk | Metal band coated desulfurization wire, and method for desulfurizing molten iron |
| JP2013147693A (en) * | 2012-01-18 | 2013-08-01 | Osaka Kohai Kk | Refining agent |
| KR20140070086A (en) * | 2012-11-30 | 2014-06-10 | 인젝션 알로이스 리미티드 | Wire for refining molten metal and associated method of manufacture |
| KR101475321B1 (en) * | 2012-12-21 | 2014-12-22 | (주)에스엔엔씨 | Method for desulfurizing molten ferronickel |
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