JPH10102128A - Operation of arc furnace and arc furnace - Google Patents

Operation of arc furnace and arc furnace

Info

Publication number
JPH10102128A
JPH10102128A JP8259198A JP25919896A JPH10102128A JP H10102128 A JPH10102128 A JP H10102128A JP 8259198 A JP8259198 A JP 8259198A JP 25919896 A JP25919896 A JP 25919896A JP H10102128 A JPH10102128 A JP H10102128A
Authority
JP
Japan
Prior art keywords
furnace
slag
steel
tapping
arc furnace
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
Application number
JP8259198A
Other languages
Japanese (ja)
Inventor
Takeshi Suzuki
健史 鈴木
Osamu Kirihara
理 桐原
San Nakato
參 中戸
Kenichi Tanmachi
健一 反町
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP8259198A priority Critical patent/JPH10102128A/en
Publication of JPH10102128A publication Critical patent/JPH10102128A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Landscapes

  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PROBLEM TO BE SOLVED: To melt low nitrogen steel by operating in an arc furnace steelmaking while closing a slag discharging hole from start of power-on to completion of steel-tapping, opening the slag discharging hole after the steel-tapping and also, tilting the furnace body to discharge molten slag. SOLUTION: Raw material charged into the arc furnace 1 is heated and melted with the arc generated by supplying the power to electrodes 2. In the period from the start of power-on through the electrodes 2 to the steel-tapping, the slag discharging hole 3 is fully closed. When the molten steel in the furnace becomes flat by melting the raw material, oxygen is blown from a lance pipe 6 inserted from an inserting hole arranged in a furnace cover 5 under air tight condition, and C, P and the other impurities are removed into the slag to adjust C content in the molten steel and the molten steel temp. Since each process is executed in the closed furnace 1, nitrogen contained the molten steel becomes low content level. The molten steel is tapped off from a steel-tapping hole 4 by tilting the furnace body. After tapping the molten steel, the slag discharging hole 3 is opened and the furnace body is tilted to the slag discharging hole 3 side to discharge the slag remaining in the furnace 1.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、低窒素鋼の溶製
を実現するアーク炉の操業方法およびこの操業方法に好
適のアーク炉に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc furnace operating method for realizing low-nitrogen steel melting and an arc furnace suitable for this operating method.

【0002】[0002]

【従来の技術】アーク炉を用いて行う製鋼は、シングル
スラグ法およびダブルスラグ法に大別される。まず、ダ
ブルスラグ法は、補修を経た炉に各種原料を装入後、通
電して原料を加熱溶解する溶解期、酸素によって不純物
を酸化除去するとともに溶鋼の昇温をはかる酸化期、次
いで、この酸化期で生じた酸化物を炉外に排出する除滓
作業を挟んで、脱硫を促進するとともに成分および鋼浴
温度の調整を行う還元期、の各工程を経て出鋼に到るも
のである。一方、シングルスラグ法は、酸化精錬終了後
に出鋼を行うものであり、排滓作業は酸化精錬と並行し
て行われる。
2. Description of the Related Art Steelmaking using an arc furnace is roughly classified into a single slag method and a double slag method. First, in the double slag method, after charging various raw materials into a furnace that has undergone repair, a melting period in which the raw material is heated and melted by energization, an oxidation period in which impurities are oxidized and removed by oxygen and the temperature of the molten steel is raised, and then Through the process of removing the oxides generated in the oxidation stage outside the furnace, the deslagging process is promoted, and the components and the steel bath temperature are adjusted. . On the other hand, in the single slag method, tapping is performed after the completion of the oxidizing and refining, and the waste disposal operation is performed in parallel with the oxidizing and refining.

【0003】[0003]

【発明が解決しようとする課題】このアーク炉によって
低窒素溶鋼を溶製するに当たり、出鋼中の吸窒を低減す
るには、シングルスラグ法が有利であるのは明らかであ
る。しかしながら、シングルスラグ法によっても、アー
ク炉にて得られる溶鋼は、転炉による溶鋼と比較して、
窒素含有量が高い傾向にあり、これがアーク炉によって
高級鋼を製造する際の課題となっている。従来は、還元
鉄や銑鉄等の炭素含有量の高い原料を使用したり炭材の
吹き込みを行って、COガスの発生量を増加することによ
って脱窒を促進するとともに、スラグフォーミングを促
進して吸窒速度を低減し、窒素含有量を低減することが
行われているが、ばらつきが大きくて確実性に欠けると
ころに問題が残る。
It is obvious that the single slag method is advantageous in reducing the nitrogen absorption during tapping in the production of low-nitrogen molten steel by this arc furnace. However, even with the single slag method, the molten steel obtained in the arc furnace, compared with the molten steel from the converter,
Nitrogen content tends to be high, which is a problem when producing high-grade steel by an arc furnace. Conventionally, the use of raw materials with a high carbon content, such as reduced iron and pig iron, and the injection of carbonaceous materials, increase the amount of CO gas generated to promote denitrification and promote slag forming. Attempts have been made to reduce the nitrogen absorption rate and the nitrogen content, but the problem remains where the dispersion is large and lacks certainty.

【0004】この発明の目的は、アーク炉製鋼法によっ
ても低窒素鋼の溶製を可能とする方途を与えるところに
あり、併せて、この方途に適したアーク炉を提案しよう
とするものである。
[0004] An object of the present invention is to provide a method that enables low-nitrogen steel to be melted even by an arc furnace steelmaking method, and to propose an arc furnace suitable for this method. .

【0005】[0005]

【課題を解決するための手段】さて、アーク炉操業の溶
解期および酸化期における酸素の吹き込みは、排滓口か
ら水冷ランスまたは消耗式ランスを挿入して行う。また
除滓作業は、酸化期と並行して行われ、炉体を排滓口側
に1〜3°程度傾けることによって、排滓口からスラグ
を流出させて行っている。このとき、必要に応じて、排
滓口からランスを挿入してコークス等の吹き込みにてス
ラグをフォーミングさせる。従って、上記の工程におい
ては必ず排滓口を開いておく必要がある。
Means for solving the problems Oxygen is blown in the melting period and the oxidation period of the operation of the arc furnace by inserting a water-cooling lance or a consumable lance from a discharge port. The slag removal operation is performed in parallel with the oxidizing period, and the slag flows out of the slag port by inclining the furnace body by about 1 to 3 degrees toward the slag port. At this time, if necessary, a lance is inserted from a waste port, and slag is formed by blowing coke or the like. Therefore, in the above process, it is necessary to open the waste port.

【0006】すなわち、操業中のアーク炉は大気に対し
て開放されているため、大気が炉内に容易に流入し、溶
鋼中に窒素が不可避に混入する。さらに、アーク中で
は、高温のために雰囲気ガスは原子化しており、アーク
スポットにおいて、雰囲気ガス中の窒素を吸収しやす
い。このため、溶鋼の窒素含有量が高くなるのである。
That is, since the operating arc furnace is open to the atmosphere, the atmosphere easily flows into the furnace, and nitrogen is inevitably mixed into the molten steel. Further, in the arc, the atmospheric gas is atomized due to high temperature, and nitrogen in the atmospheric gas is easily absorbed at the arc spot. For this reason, the nitrogen content of the molten steel increases.

【0007】そこで、発明者らは、操業を基本的に密閉
した環境で行って大気の流入を回避する手法について究
明したところ、密閉した環境を実現するためには排滓口
を閉じておくのが単純にして有効な解決策であり、その
ためには出鋼以前の排滓工程を省略する必要のあること
が判明した。
[0007] The inventors of the present invention have studied a method of avoiding the inflow of air by basically performing the operation in a closed environment, and found that the discharge port is closed in order to realize a closed environment. Was found to be a simple and effective solution, for which it was necessary to omit the waste process prior to tapping.

【0008】ここで、上記したダブルスラグ法におい
て、出鋼以前の排滓工程が不可欠であったのは、酸化ス
ラグを還元期以前に排出し、還元剤使用量を低減するた
めである。元来、アーク炉の炉体設備は、ダブルスラグ
法を念頭に設計されたものであり、酸化スラグの排出、
すなわち出鋼以前の排滓のみが可能な構造となってい
る。具体的には、排滓側の炉体傾動角が小さく、出鋼後
の排滓は行えない。
Here, in the above-mentioned double slag method, the waste step before tapping is indispensable in order to discharge oxidized slag before the reduction period and to reduce the amount of reducing agent used. Originally, the furnace body equipment of the arc furnace was designed with the double slag method in mind, and the discharge of oxide slag,
That is, it has a structure that allows only the waste before tapping. Specifically, the furnace body tilt angle on the waste side is small, and waste after tapping cannot be performed.

【0009】一方、この発明で対象とする、シングルス
ラグ法においては、出鋼以前の酸化スラグの排出工程は
必須ではなく、出鋼後に排滓を行っても大きな問題を生
じない。なお、酸化期における酸素の吹き込みは必ずし
も排滓口から行わなくてもよく、例えば炉蓋からの上吹
きも可能であるから、排滓口を出鋼後まで閉じておくこ
とは可能である。
On the other hand, in the single slag method, which is the object of the present invention, the step of discharging the oxidized slag before tapping is not indispensable. In addition, the blowing of oxygen in the oxidation stage does not necessarily have to be performed from the waste outlet, and for example, it is also possible to blow upward from the furnace lid. Therefore, it is possible to close the waste outlet until after tapping.

【0010】この発明は、アーク炉内に装入した原料を
加熱溶解後に精錬を行って鋼を溶製するに当たり、アー
ク炉の電極への通電開始から出鋼が終了するまでの期間
は排滓口を閉じて操業を行い、出鋼後に排滓口を開くと
ともに排滓口側に炉体を傾動して、炉内の溶融スラグを
排出することを特徴とするアーク炉の操業方法である。
According to the present invention, in refining after heating and melting a raw material charged in an arc furnace to smelt steel, the period between the start of energization of the electrode of the arc furnace and the end of tapping is settled. An operation method of an arc furnace, wherein the operation is performed by closing a mouth, opening a discharge port after tapping steel, and tilting the furnace body to the discharge port side to discharge molten slag in the furnace.

【0011】また、上記の方法には、炉体の底部に出鋼
口を、および側部に排滓口を、それぞれ設けて成るアー
ク炉であって、該炉体は、炉内のスラグまたは溶鋼の全
量を排滓口より排出可能な傾動角度を有することを特徴
とするアーク炉が有利に適合する。
[0011] The above-mentioned method is also an arc furnace comprising a tapping hole at the bottom of the furnace body and a discharge port at a side thereof, wherein the furnace body has a slag or a slag inside the furnace. An arc furnace characterized in that it has a tilting angle that allows the entire amount of molten steel to be discharged from the waste port is advantageously adapted.

【0012】とりわけ、アーク炉の排滓口としては、炉
体の側部から炉の径方向外側に延びる突出部分の底部か
ら鉛直下方に向けて開口させ、該開口をスライディング
ゲートにて開閉可能に構成したもの、または原料溶解後
の溶鋼面上に生成するスラグ面より低い位置に開口を有
し、該開口の外側に間隔を置いて、開口を覆うに十分な
面積の堰板を設けたもの、が推奨される。
In particular, a discharge port of the arc furnace is opened vertically downward from the bottom of a protruding portion extending radially outward of the furnace from the side of the furnace body, and the opening can be opened and closed by a sliding gate. Structured, or having openings at a position lower than the slag surface generated on the molten steel surface after melting the raw material, providing a weir plate with sufficient area to cover the openings at intervals outside the openings , Is recommended.

【0013】[0013]

【発明の実施の形態】次に、この発明の方法について、
図1を参照して詳しく述べる。まず、通常のアーク炉製
鋼と同様に、炉の補修作業を行ったのち、炉内に所定配
合の原料を装入する。その後、図1(a) に示すように、
アーク炉1内に装入した原料を、電極2に通電して発生
させたアークによって加熱して溶解する(溶解期)。こ
こで、電極2へ通電を開始してから出鋼までの期間は、
排滓口3を完全に閉じておくことが肝要である。なお、
符号4は、炉体の突出部分の底部に下向き開口で設けた
出鋼口であり、スライディングゲートを介して開閉す
る。
Next, the method of the present invention will be described.
This will be described in detail with reference to FIG. First, as in the case of ordinary arc furnace steelmaking, the furnace is repaired, and then a raw material having a predetermined composition is charged into the furnace. Then, as shown in FIG.
The raw material charged in the arc furnace 1 is heated and melted by an arc generated by energizing the electrode 2 (melting period). Here, the period from the start of energization to the electrode 2 until tapping is
It is important that the waste outlet 3 is completely closed. In addition,
Reference numeral 4 denotes a tapping port provided at the bottom of the protruding portion of the furnace body with a downward opening, which opens and closes via a sliding gate.

【0014】そして、原料が溶解して炉内の湯面が平坦
に、いわゆるフラットバスを形成したならば、例えば炉
蓋5に設けた挿入孔から気密下で差し入れたランスパイ
プ6から酸素を吹き込み、CやP、その他の不純物をス
ラグ中に除去するとともに、C量および鋼浴温度の調整
を行う。
If the raw material is melted and the molten metal surface in the furnace is flattened to form a so-called flat bath, for example, oxygen is blown in from a lance pipe 6 inserted in an airtight manner through an insertion hole provided in the furnace lid 5. , C, P and other impurities are removed from the slag, and the C content and the steel bath temperature are adjusted.

【0015】以上の各工程は、ほぼ密閉された炉内で精
錬が進むため、従来の大気に開放された炉内での精錬に
比較して、溶鋼に混入する窒素は極めて低レベルとなる
のである。かくして溶製された低窒素鋼は、図1(b) に
示すように、炉体を傾けるとともに、出鋼口4を開くこ
とによって、炉外に排出される。
In each of the above steps, the refining proceeds in a substantially hermetic furnace, so that the nitrogen mixed into the molten steel is at an extremely low level as compared with the conventional refining in a furnace open to the atmosphere. is there. The low-nitrogen steel thus melted is discharged out of the furnace by tilting the furnace body and opening the tap hole 4, as shown in FIG. 1 (b).

【0016】次に、出鋼作業の終了後は、図1(c) に示
すように、排滓口3を開いて炉体を排滓口3側に傾動す
ることによって、炉内に残ったスラグを排出する。この
除滓作業は、酸化期の後に行う除滓作業と異なり、溶鋼
上に浮上したスラグを流出させるわけではなく、炉底部
に残ったスラグを排出するため、炉体の傾動角度を大き
く、具体的には30°以上にする必要がある。この大きな
傾動角度を実現することによって、始めて出鋼後の排滓
が可能になる。
Next, after the end of the tapping operation, as shown in FIG. 1 (c), the waste outlet 3 is opened and the furnace body is tilted to the waste outlet 3 side, thereby remaining in the furnace. Drain slag. Unlike the slag removal operation performed after the oxidation stage, the slag removal operation does not cause the slag floating on the molten steel to flow out, but discharges the slag remaining at the furnace bottom, thereby increasing the tilt angle of the furnace body. Typically, the angle must be 30 ° or more. By realizing this large tilting angle, it is possible to discharge waste after tapping for the first time.

【0017】ここで、炉体に30°以上の傾動角度を与え
るには、例えば図2または図3に示す構造が適してい
る。すなわち、図2に示す構造は、従来多用されてい
る、いわゆる油圧ロッカ式の傾動装置における、傾動用
の油圧シリンダー7のストロークを長くしたものであ
る。
Here, in order to give the furnace body a tilt angle of 30 ° or more, for example, the structure shown in FIG. 2 or FIG. 3 is suitable. That is, the structure shown in FIG. 2 is obtained by extending the stroke of the hydraulic cylinder 7 for tilting in a so-called hydraulic rocker type tilting device that has been frequently used in the related art.

【0018】さらに、図3に示す構造は、従来、製鋼用
転炉の傾動装置として用いられているもので、トラニオ
ンリング式と呼ばれている。すなわち、炉体1に接続さ
れた炉体支持軸8aを軸受9に固定する一方、炉体支持軸
8bをユニバーサルカップリング10を介してトラニオン軸
11と接続するものである。なお、炉体1の傾動は、トラ
ニオン軸11をモーター駆動することにより行う。
The structure shown in FIG. 3 is conventionally used as a tilting device of a steelmaking converter, and is called a trunnion ring type. That is, the furnace body support shaft 8a connected to the furnace body 1 is fixed to the bearing 9, while the furnace body support shaft 8a is fixed.
8b to the trunnion shaft via universal coupling 10
Connect with 11. The furnace body 1 is tilted by driving the trunnion shaft 11 with a motor.

【0019】また、この発明の方法に従って、操業中は
アーク炉の排滓口を閉じて炉内を密閉するに当たり、図
1に示した炉体側部に設けた、在来の排滓口の構造で
は、排滓口を閉じた際の気密性に改善の余地があるとこ
ろから、図4および図5に示す排滓口を適用することが
好ましい。
In addition, according to the method of the present invention, when the discharge port of the arc furnace is closed during operation and the inside of the furnace is sealed, the structure of the conventional discharge port provided on the side of the furnace body shown in FIG. Then, it is preferable to apply the drain port shown in FIGS. 4 and 5 because there is room for improvement in airtightness when the drain port is closed.

【0020】すなわち、図4に示す排滓口30は、炉体の
側部から炉の径方向外側に延びる突出部分の底部に、そ
の開口を鉛直下方に向けて設け、かつ開口をスライディ
ングゲート31にて開閉可能に構成したものである。従っ
て、炉内にフラットバスが形成し、さらにスラグ層が生
成されると、排滓口30は少なくともスラグ面下に位置す
るため、その気密性は高い次元で維持される。
That is, the discharge port 30 shown in FIG. 4 is provided at the bottom of a protruding portion extending from the side of the furnace body to the outside in the radial direction of the furnace, with its opening directed vertically downward, and the opening formed with the sliding gate 31. It is configured to be openable and closable. Therefore, when a flat bath is formed in the furnace and a slag layer is generated, the discharge port 30 is located at least below the slag surface, so that the airtightness is maintained at a high level.

【0021】次に、図5に示す排滓口32は、まず原料溶
解後の溶鋼面(フラットバス)St上に生成するスラグ
面Sl より低い位置に開口33を有し、該開口33の外側に
間隔を置いて、開口33を覆うに十分な面積の堰板34を設
けたものであり、図示例では、さらに堰板34の上方に屈
曲したカバー35を設け、断面逆U字状の通路36を形成し
て成る。すなわち、開口33の上限がスラグ面Sl の下に
位置して、開口33は常時スラグで塞がれるため、気密性
が保持されるのである。なお、堰板34の上端よりスラグ
面Sl が上昇すると、その上昇分のスラグは堰板34をこ
えて通路36を通って炉外に排出されるため、超過スラグ
を適宜排出することが可能である。この構造は、特に脈
石含有量の多い還元鉄の原料を使用した場合など、スラ
グ量の増加が予想される場合に有利である。
Next, the discharge port 32 shown in FIG. 5 has an opening 33 at a position lower than the slag surface Sl generated on the molten steel surface (flat bath) St after the raw material is melted. At an interval, a weir plate 34 having an area sufficient to cover the opening 33 is provided. In the illustrated example, a cover 35 bent above the weir plate 34 is further provided, and a passage having an inverted U-shaped cross section is provided. 36 is formed. That is, since the upper limit of the opening 33 is located below the slag surface Sl and the opening 33 is always closed by the slag, airtightness is maintained. When the slag surface Sl rises from the upper end of the weir plate 34, the excess slag is discharged out of the furnace through the passage 36 beyond the weir plate 34, so that excess slag can be appropriately discharged. is there. This structure is advantageous when an increase in the amount of slag is expected, for example, when a raw material of reduced iron having a high gangue content is used.

【0022】[0022]

【実施例】表1に示す配合の原料を用いて、図1に示し
た要領に従う、直流アーク炉(容量:100 t)による製
鋼を行った。すなわち、電極への通電開始から出鋼まで
は排滓口を閉じて、出鋼後に炉体を30°に傾けて排滓を
行った。また、比較として、同様の条件にて精錬を行う
際、酸化期後に排滓口を開けて除滓作業を行ってから、
出鋼する操業も実施した。
EXAMPLES Using the raw materials having the compositions shown in Table 1, steelmaking was performed in a DC arc furnace (capacity: 100 t) according to the procedure shown in FIG. That is, from the start of current supply to the electrode to the tapping, the tap was closed, and after tapping, the furnace body was tilted at 30 ° for tapping. In addition, as a comparison, when performing refining under the same conditions, after opening the waste port after the oxidation period and performing the debris removal work,
A tapping operation was also conducted.

【0023】かくして得られた溶鋼について、その出鋼
前の成分におけるCおよびNの含有量を調査した。その
結果を表1に示すように、この発明に従って得られた溶
鋼は、その出鋼前のN含有量が格段に低減されているこ
とがわかる。
With respect to the molten steel thus obtained, the contents of C and N in the components before tapping were investigated. As shown in Table 1, the results show that the molten steel obtained according to the present invention has a significantly reduced N content before tapping.

【0024】[0024]

【表1】 [Table 1]

【0025】次に、図1に示した排滓口とは異なる、図
4および図5に示した構造の排滓口を備える各炉を用い
て、同様の操業を行った同様の調査結果について、表2
および表3に示す。これら表から、排滓口の構造によっ
て、さらに溶鋼中のNを低減できることが明らかであ
る。
Next, similar investigation results were obtained by performing similar operations using each of the furnaces having the discharge ports having the structure shown in FIGS. 4 and 5 which are different from the discharge ports shown in FIG. , Table 2
And Table 3. From these tables, it is clear that N in the molten steel can be further reduced by the structure of the discharge port.

【0026】[0026]

【表2】 [Table 2]

【0027】[0027]

【表3】 [Table 3]

【0028】[0028]

【発明の効果】この発明によれば、アーク炉製鋼法によ
っても低窒素鋼の溶製が実現されるから、アーク炉製鋼
法を高級鋼の溶製にも適用することができる。
According to the present invention, since low-nitrogen steel can be produced by the arc furnace steelmaking method, the arc furnace steelmaking method can be applied to the production of high-grade steel.

【図面の簡単な説明】[Brief description of the drawings]

【図1】アーク炉の操業要領を示す図である。FIG. 1 is a diagram showing the operation procedure of an arc furnace.

【図2】アーク炉の傾動構造を示す図である。FIG. 2 is a view showing a tilting structure of the arc furnace.

【図3】アーク炉の傾動構造を示す図である。FIG. 3 is a view showing a tilting structure of the arc furnace.

【図4】排滓口の構造を示す図である。FIG. 4 is a view showing the structure of a waste outlet.

【図5】排滓口の構造を示す図である。FIG. 5 is a diagram showing a structure of a waste outlet.

【符号の説明】[Explanation of symbols]

1 アーク炉 2 電極 3 排滓口 4 出鋼口 5 炉蓋 6 ランスパイプ 7 油圧シリンダー 8a 炉体支持軸 8b 炉体支持軸 9 軸受 10 ユニバーサルカップリング 11 トラニオン軸 30 排滓口 31 スライディングゲート 32 排滓口 33 開口 34 堰板 35 カバー 36 通路 DESCRIPTION OF SYMBOLS 1 Arc furnace 2 Electrode 3 Drain port 4 Steel tap hole 5 Furnace lid 6 Lance pipe 7 Hydraulic cylinder 8a Furnace support shaft 8b Furnace support shaft 9 Bearing 10 Universal coupling 11 Trunnion shaft 30 Drain port 31 Sliding gate 32 Drain Drain 33 Opening 34 Weir plate 35 Cover 36 Passageway

フロントページの続き (72)発明者 中戸 參 岡山県倉敷市水島川崎通1丁目(番地な し) 川崎製鉄株式会社水島製鉄所内 (72)発明者 反町 健一 岡山県倉敷市水島川崎通1丁目(番地な し) 川崎製鉄株式会社水島製鉄所内Continuation of the front page (72) Inventor Nakato Sanka 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. No address) Inside the Kawasaki Steel Works, Mizushima Works

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 アーク炉内に装入した原料を加熱溶解後
に精錬を行って鋼を溶製するに当たり、アーク炉の電極
への通電開始から出鋼が終了するまでの期間は排滓口を
閉じて操業を行い、出鋼後に排滓口を開くとともに排滓
口側に炉体を傾動して、炉内の溶融スラグを排出するこ
とを特徴とするアーク炉の操業方法。
When refining is performed after heating and melting a raw material charged into an arc furnace to melt steel, a discharge port is provided during a period from the start of energization of an electrode of the arc furnace to the end of tapping. A method for operating an arc furnace, wherein the operation is performed by closing the furnace, and after the tapping of steel, the discharge port is opened and the furnace body is tilted to the discharge port side to discharge molten slag in the furnace.
【請求項2】 炉体の底部に出鋼口を、および側部に排
滓口を、それぞれ設けて成るアーク炉であって、該炉体
は、炉内のスラグまたは溶鋼の全量を排滓口より排出可
能な傾動角度を有することを特徴とするアーク炉。
2. An arc furnace comprising a tap hole at the bottom of a furnace body and a tap hole at a side thereof, wherein the furnace body discharges the entire amount of slag or molten steel in the furnace. An arc furnace having a tilt angle capable of being discharged from a mouth.
【請求項3】 排滓口は、炉体の側部から炉の径方向外
側に延びる突出部分の底部から鉛直下方に向けて開口さ
せ、該開口をスライディングゲートにて開閉可能に構成
した請求項2に記載のアーク炉。
3. The drain port is opened vertically downward from the bottom of a protruding portion extending radially outward from the furnace from the side of the furnace body, and the opening is openable and closable by a sliding gate. 3. The arc furnace according to 2.
【請求項4】 排滓口は、原料溶解後の溶鋼面上に生成
するスラグ面より低い位置に開口を有し、該開口の外側
に間隔を置いて、開口を覆うに十分な面積の堰板を設け
た請求項2に記載のアーク炉。
4. A drain port having an opening at a position lower than a slag surface formed on a molten steel surface after melting the raw material, and a weir having an area outside the opening and having a sufficient area to cover the opening. The arc furnace according to claim 2, wherein a plate is provided.
JP8259198A 1996-09-30 1996-09-30 Operation of arc furnace and arc furnace Pending JPH10102128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8259198A JPH10102128A (en) 1996-09-30 1996-09-30 Operation of arc furnace and arc furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8259198A JPH10102128A (en) 1996-09-30 1996-09-30 Operation of arc furnace and arc furnace

Publications (1)

Publication Number Publication Date
JPH10102128A true JPH10102128A (en) 1998-04-21

Family

ID=17330750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8259198A Pending JPH10102128A (en) 1996-09-30 1996-09-30 Operation of arc furnace and arc furnace

Country Status (1)

Country Link
JP (1) JPH10102128A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054512A1 (en) * 1997-02-19 1999-10-28 Kawasaki Steel Corporation Method of judging slag forming state in electric furnace steel production and method of operating electric furnace
KR100701565B1 (en) 2005-11-16 2007-03-29 김상석 Melting pot type reverberatory furmace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054512A1 (en) * 1997-02-19 1999-10-28 Kawasaki Steel Corporation Method of judging slag forming state in electric furnace steel production and method of operating electric furnace
US6375701B1 (en) * 1998-04-21 2002-04-23 Kawasaki Steel Corporation Method of judging slag forming state in electric furnace steel production and method of operating electric furnace
KR100701565B1 (en) 2005-11-16 2007-03-29 김상석 Melting pot type reverberatory furmace

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