JPH0510684A - Method and apparatus for reducing flowout of molten steel slag for electric furnace - Google Patents
Method and apparatus for reducing flowout of molten steel slag for electric furnaceInfo
- Publication number
- JPH0510684A JPH0510684A JP3159238A JP15923891A JPH0510684A JP H0510684 A JPH0510684 A JP H0510684A JP 3159238 A JP3159238 A JP 3159238A JP 15923891 A JP15923891 A JP 15923891A JP H0510684 A JPH0510684 A JP H0510684A
- Authority
- JP
- Japan
- Prior art keywords
- stopper
- steel
- level
- tapping
- slag
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 44
- 239000010959 steel Substances 0.000 title claims abstract description 44
- 239000002893 slag Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 36
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 2
- 238000007598 dipping method Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005303 weighing Methods 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
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、炉底出鋼方式（ＥＢ
Ｔ）電気炉におけるスラグ流出量を減少させる装置に関
する。BACKGROUND OF THE INVENTION The present invention relates to a bottom-rolled steel strip method (EB
T) An apparatus for reducing slag outflow in an electric furnace.
【０００２】[0002]
【従来の技術】特公昭５９−２６２２９号公報、実開昭
６１−７５５６号公報、実開昭６１−７５５７号公報等
に開示されているように、近年、電気炉による高品質鋼
の精錬が行われるようになり、製鋼効率を挙げるために
種々の試みが行われ、電気炉による精錬によって直接、
成分と品質とのバランスが採れた直行効率の高い成品を
得るようになった。2. Description of the Related Art As disclosed in Japanese Examined Patent Publication No. 59-26229, Japanese Utility Model Laid-Open No. 61-7556, Japanese Utility Model Laid-Open No. 61-7557, etc., in recent years, refining of high-quality steel by an electric furnace has been performed. As a result, various attempts have been made to increase the efficiency of steelmaking, and directly by refining with an electric furnace,
We have come to obtain products with a high direct efficiency that balance the ingredients and quality.
【０００３】この直行効率を左右する要因として、出鋼
時の取鍋への電気炉からのスラグの流出量がある。A factor that influences the orthogonal efficiency is the amount of slag flowing out of the electric furnace into the ladle at the time of tapping.
【０００４】電気炉スラグが取鍋内に流出し、混合状態
にある中で二次精錬を行う過程でＡｌ脱酸すれば、Ａｌ
ロス（Ａｌ2 Ｏ3 化）によるコストアップ、スラグ中Ｐ
2 Ｏ5 の溶鋼への溶け込みによる復〔Ｐ〕による鋼品質
悪化、成分外れ、Ａｌ2 Ｏ3 の増加による鋼中介在物の
増加による鋼加工成品の歩留り悪化が生じる。If the electric furnace slag flows out into the ladle and Al is deoxidized during the secondary refining process in the mixed state, Al
Ross (Al 2 O 3 of) by cost, slag P
Deterioration of steel due to recovery [P] due to penetration of 2 O 5 into molten steel, depletion of components, and increase in inclusions in the steel due to increase in Al 2 O 3 cause deterioration in yield of steel processed products.
【０００５】従来から、電気炉による炉底出鋼方式によ
って同一鋼種を連続溶解する場合のスラグの流出防止
は、次のチャージのスクラップ溶解促進を兼ねて、炉内
に約１０〜２０％重量の溶鋼を残す残湯出鋼を行い、最
終チャージの際に完全出鋼する方法が多く採られてい
た。Conventionally, in order to prevent the outflow of slag when the same steel type is continuously melted by the bottom steel tapping method using an electric furnace, the slag can be promoted to the next charge and the melting of scrap can be promoted. In many cases, a method of tapping the remaining molten steel to leave the molten steel and completely tapping the steel at the time of the final charge was adopted.
【０００６】また、転炉製鋼法において採用されている
方式も転用されている。Further, the method adopted in the converter steelmaking method is also diverted.
【０００７】例えば、出鋼口栓を機械的に転炉装入口か
ら出鋼口末期に耐火物で構成されたストッパーによって
出鋼口を閉鎖するストッパー方式、溶鋼とスラグの中間
比重で作成した耐火物ボール又は浮子形状の物を転炉出
鋼口直上部に、転炉装入口から出鋼末期に落とし込み、
溶鋼が少なくなると比重差によって自然的に栓の機能を
発揮し、スラグ流出防止に効果を発揮するスラグボール
方式、、出鋼口内にエアーブロー管を配したエアブロー
方式、スライディングゲート方式がある。For example, a stopper system in which a tap hole is closed mechanically from a converter charging port at the end of the tap hole by a stopper made of a refractory material at the end of the tap hole, a refractory made with an intermediate specific gravity of molten steel and slag A ball or float-shaped object is dropped directly above the converter tap hole from the converter loading port at the end of tapping,
There is a slag ball system that naturally exhibits the function of a plug when the amount of molten steel decreases due to the difference in specific gravity and is effective in preventing slag outflow, an air blow system with an air blow pipe inside the tap hole, and a sliding gate system.
【０００８】しかしながら、構造も操業条件も異なる転
炉のスラグ流出を電気炉に適用しても不完全な機能を発
揮するのにとどまっている。However, even if the slag outflow of a converter having different structures and operating conditions is applied to an electric furnace, the function is incomplete.
【０００９】[0009]
【発明が解決しようとする課題】本発明の目的は、炉底
出鋼方式による電気炉の操業において、鋼品質悪化、成
分外れ、Ａｌ2 Ｏ3 の増加による鋼中介在物の増加によ
る鋼加工成品の歩留り悪化の原因となるスラグの取鍋へ
の混入を効果的に低減させるための手段を確立すること
にある。DISCLOSURE OF THE INVENTION The object of the present invention is, in the operation of an electric furnace using a bottom steel tapping method, steel processing due to deterioration of steel quality, loss of components, and increase of inclusions in steel due to increase of Al 2 O 3. It is to establish means for effectively reducing the mixing of slag into the ladle, which causes the yield of the product to deteriorate.
【００１０】[0010]
【課題を解決するための手段】本発明のスラグ流出防止
手段は、出鋼初期から出鋼口直上部にスラグ層を貫通
し、溶鋼中にストッパーを浸漬せしめることによってそ
の目的を達成した。Means for Solving the Problems The slag outflow preventing means of the present invention has achieved its purpose by penetrating the slag layer immediately above the tapping mouth from the beginning of tapping and immersing the stopper in the molten steel.
【００１１】そのための具体的な手段としては、電気炉
の底部に形成した出鋼口に対してストッパーを昇降自在
に設けると共に、同ストッパーを出鋼開始信号を受けて
スラグ層を貫通して溶鋼中に浸漬する位置まで下降し、
また、出鋼終了信号を受信して炉底出鋼口を閉塞せしめ
る制御機構を設けたことを特徴とする。As a concrete means therefor, a stopper is provided so as to be able to move up and down with respect to a tapping port formed at the bottom of the electric furnace, and the stopper penetrates the slag layer in response to a tapping start signal to melt the molten steel. Descend to the position to immerse inside,
Further, it is characterized in that a control mechanism is provided for closing the furnace bottom tapping port upon receiving the tapping completion signal.
【００１２】出鋼終了時におけるストッパー先端と出鋼
口の上端の完全な閉塞には、いかなる炉体角度でも直行
閉塞状態の保持が重要であり、制御機構の容易性，設備
の小型化のためにも本装置は電気炉に一体に取付けるこ
とが望ましい。In order to completely close the stopper tip and the upper end of the tapping mouth at the end of tapping, it is important to maintain the orthogonal blocking state at any furnace angle, in order to facilitate the control mechanism and downsize the equipment. Moreover, it is desirable that this device be integrally attached to the electric furnace.
【００１３】[0013]
【作用】出鋼の初め又は途中からスラグストッパーをス
ラグ層及び溶鋼中に浸漬せしめることによって、出鋼口
から溶鋼が流出する時に生じる「渦流」の発生を効果的
に防止する。By soaking the slag stopper in the slag layer and the molten steel from the beginning or the middle of the tapping, it is possible to effectively prevent the generation of "vortex" that occurs when the molten steel flows out from the tapping port.
【００１４】表１は、転炉の場合と電気炉の場合とでの
出鋼口のスラグ流出の時系列毎の調査結果の１例を示
す。Table 1 shows an example of the results of the slag outflow from the tapping port in the case of a converter and in the case of an electric furnace for each time series.
【００１５】[0015]
【表１】 [Table 1]
【００１６】この調査結果から、ＥＢＴ電気炉の場合、
転炉の場合よりも出鋼中の渦流による巻き込みが極めて
大きく、次いで、出鋼後の炉体復帰完了までのスラグス
トッパーの閉塞の持続が重要であることが判る。本発明
は、このＥＢＴ電気炉の場合のスラグ流出の態様に最も
効果的に対応するものである。From the results of this investigation, in the case of the EBT electric furnace,
It can be seen that the entrainment due to the vortex during tapping is much larger than in the case of the converter, and then it is important to maintain the closure of the slag stopper until the completion of the return of the furnace body after tapping. The present invention most effectively corresponds to the mode of slag outflow in the case of this EBT electric furnace.
【００１７】[0017]
【実施例】図１に本発明の出鋼スラグ減少装置の操作態
様を示す。EXAMPLE FIG. 1 shows an operating mode of the tapped slag reducing apparatus of the present invention.
【００１８】１は傾動装置２によって傾動可能で、且つ
底部に出鋼口３を有する電気炉を示す。４は電気炉１の
出鋼口３の下面に出入自在に設けられた出鋼口開閉装置
を示す。「渦流」発生防止機構、すなわち、スラグ流出
防止機構は、電気炉の底部出鋼口３に対して昇降自在に
取り付けられたストッパー５と、ストッパー昇降基台６
に取り付けられ、ベルト掛けされた上下のプーリー７，
８とストッパー支持アーム９とからなる。１０は電気炉
１の出鋼口３の下方位置に移動配置された取鍋を示し、
１１は取鍋への溶鋼収納量を検知するロードセルを示
す。ロードセル１１からの信号は、図示しないストッパ
ー５の昇降駆動機構に発信される。同図の右側に精錬、
出鋼作業に対するストッパー５の昇降移動の態様を示
す。Reference numeral 1 denotes an electric furnace which can be tilted by a tilting device 2 and which has a tap hole 3 at the bottom. Reference numeral 4 denotes a tap hole opening / closing device which is provided on the lower surface of the tap hole 3 of the electric furnace 1 so as to be freely put in and taken out. The "vortex" generation preventing mechanism, that is, the slag outflow preventing mechanism, includes a stopper 5 that is attached to the bottom steel outlet 3 of the electric furnace so as to be able to move up and down, and a stopper lifting base 6
The upper and lower pulleys 7, which are attached to the
8 and a stopper support arm 9. Reference numeral 10 denotes a ladle which is moved and arranged below the tap hole 3 of the electric furnace 1,
Reference numeral 11 indicates a load cell for detecting the amount of molten steel stored in the ladle. The signal from the load cell 11 is transmitted to a lift drive mechanism for the stopper 5 (not shown). Refining on the right side of the figure,
The aspect of the raising / lowering movement of the stopper 5 with respect to tapping work is shown.
【００１９】同図に示すように、電気炉精錬の終了時点
で、図示しない操作盤の出鋼準備押しボタンを押すと、
出鋼口開閉装置４が開き、ストッパー５は、スタート待
機レベルであるレベルＡから、ストッパー予熱レベルＢ
に移動停止する。各レベルにおける停止位置は図示しな
いリミットスイッチから信号を受け決定される。この位
置でストッパー５は予熱され、高温の溶鋼に浸漬しても
スポーリング現象が生じない。As shown in the figure, at the end of the electric furnace refining, if the tapping preparation push button on the operation panel (not shown) is pressed,
The tap hole opening / closing device 4 opens, and the stopper 5 moves from the level A, which is the start standby level, to the stopper preheating level B.
Stop moving to. The stop position at each level is determined by receiving a signal from a limit switch (not shown). At this position, the stopper 5 is preheated, and the spalling phenomenon does not occur even if it is immersed in high temperature molten steel.
【００２０】次に出鋼開始押しボタンを押すと、電気炉
１は傾動し、電気炉１内の溶鋼が取鍋１０に流出する。
この時、ストッパー５は、スラグの上面レベルＣを過ぎ
て溶鋼内レベルＤまで降下する。このレベルＤにおい
て、出鋼が進行して、出鋼末期になると出鋼口３とスト
ッパー５先端の隙間を調整するために、ストッパー５を
レベルＤからレベルＥに移行させる。この移動のための
信号はロードセル１１における設定溶鋼秤量値で与えら
れ、この状態で溶鋼の絞り出し状態となる。この状態で
は、出鋼口３上端とストッパーヘッドのクリアランスが
大きすぎるとスラグが出やすく、小さすぎると出鋼に時
間がかかりすぎることになる。出鋼完了の段階で、スト
ッパー５はレベルＦからレベルＥに移行する。同時に電
気炉１は復帰傾動に移行して、出鋼作業が完了する。電
気炉１が水平角度位置まで完全復帰すると、レベルＥか
らレベルＡの待機ステータスに移行する。これで１サイ
クルの機能は完了する。Next, when the tapping start push button is pressed, the electric furnace 1 tilts and the molten steel in the electric furnace 1 flows out into the ladle 10.
At this time, the stopper 5 passes the upper surface level C of the slag and descends to the in-molten steel level D. At this level D, when tapping progresses and at the final stage of tapping, the stopper 5 is shifted from level D to level E in order to adjust the clearance between the tapping mouth 3 and the tip of the stopper 5. The signal for this movement is given by the set molten steel weighing value in the load cell 11, and the molten steel is squeezed out in this state. In this state, if the clearance between the upper end of the tapping mouth 3 and the stopper head is too large, slag tends to come out, and if it is too small, tapping takes too much time. At the stage of completion of tapping, the stopper 5 shifts from level F to level E. At the same time, the electric furnace 1 shifts to the return tilting, and the tapping operation is completed. When the electric furnace 1 is completely returned to the horizontal angle position, the standby status of level E is changed from level E. This completes the function of one cycle.
【００２１】[0021]
【発明の効果】本発明によって以下の効果を奏する。The present invention has the following effects.
【００２２】（１）電気炉の出鋼口から流出するスラグ
の量は極端に低減する。(1) The amount of slag flowing out from the tap hole of the electric furnace is extremely reduced.
【００２３】（２）溶鋼中に添加する脱酸剤の量が少な
くて済み、歩留り向上によりコストが低下する。(2) The amount of the deoxidizing agent added to the molten steel is small, and the cost is reduced by improving the yield.
【００２４】（３）溶鋼中の脱酸剤による酸化物介在物
が減少し、溶鋼の高品質化が達成される。(3) Oxide inclusions due to the deoxidizing agent in the molten steel are reduced, and the quality of the molten steel is improved.
【００２５】（４）スラグからの溶鋼への復燐が減少
し、成分適中率が向上する。(4) Re-phosphorus from slag into molten steel is reduced, and the appropriateness of components is improved.
【００２６】（５）スラグ量が少なくなるために、取鍋
寿命が向上する。(5) Since the amount of slag is reduced, the life of the ladle is improved.
【図１】 本発明の出鋼スラグ減少装置の操作態様を示
す。FIG. 1 shows an operating mode of a tapped slag reducing apparatus of the present invention.
１ 電気炉 ２ 傾動装置 ３ 出鋼口 ４ 出
鋼口開閉装置
５ ストッパー ６ ストッパー昇降基台 ７，８
プーリー
９ ストッパー支持アーム １０ 取鍋 １１
ロードセル
Ａ〜Ｆ ストッパーの操作レベル1 Electric Furnace 2 Tilt Device 3 Steel Tap 4 Steel Tap Opening / Closing Device 5 Stopper 6 Stopper Lifting Base 7,8
Pulley 9 Stopper support arm 10 Ladle 11
Load cell A to F Stopper operation level
───────────────────────────────────────────────────── フロントページの続き (72)発明者 杉原 弘祥 大阪府堺市中三国丘６−１ ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hirosugi Sugihara 6-1 Nakamikunioka, Sakai City, Osaka Prefecture
Claims (2)
貫通し、溶鋼中にストッパーを浸漬せしめる電気炉の出
鋼スラグ流出減少方法。1. A method for reducing outflow of tapped slag in an electric furnace, which comprises penetrating a slag layer directly above a tapping port from the beginning of tapping and immersing a stopper in molten steel.
ストッパーを昇降自在に設けると共に、同ストッパーを
出鋼開始信号を受けてスラグ層を貫通して溶鋼中に浸漬
する位置まで下降し、また、出鋼終了信号を受信して炉
底出鋼口を閉塞せしめる制御機構を設けた電気炉におけ
る出鋼スラグ流出減少装置。2. A stopper is provided so as to be able to move up and down with respect to a tapping opening formed at the bottom of the electric furnace, and the stopper is lowered to a position where it penetrates a slag layer and is immersed in molten steel upon receiving a tapping start signal. In addition, a tapping slag outflow reducing device in an electric furnace provided with a control mechanism for closing the tapping outlet of the furnace bottom upon receiving a tapping completion signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3159238A JP2506240B2 (en) | 1991-06-29 | 1991-06-29 | Reduction method of tapping slag outflow in electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3159238A JP2506240B2 (en) | 1991-06-29 | 1991-06-29 | Reduction method of tapping slag outflow in electric furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0510684A true JPH0510684A (en) | 1993-01-19 |
| JP2506240B2 JP2506240B2 (en) | 1996-06-12 |
Family
ID=15689367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3159238A Expired - Lifetime JP2506240B2 (en) | 1991-06-29 | 1991-06-29 | Reduction method of tapping slag outflow in electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2506240B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100898248B1 (en) * | 2002-08-22 | 2009-05-18 | 주식회사 포스코 | Apparatus for preventing lump metal by shaking slag pot and detecting weight |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5926229A (en) * | 1982-08-03 | 1984-02-10 | Hitachi Zosen Corp | Centrifugal molding method |
| JPS616194U (en) * | 1984-06-18 | 1986-01-14 | 日本鋼管株式会社 | Bottom tapping type electric furnace |
| JPS6110499U (en) * | 1984-06-26 | 1986-01-22 | 川崎製鉄株式会社 | Stopper device in bottom pouring melting furnace |
-
1991
- 1991-06-29 JP JP3159238A patent/JP2506240B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5926229A (en) * | 1982-08-03 | 1984-02-10 | Hitachi Zosen Corp | Centrifugal molding method |
| JPS616194U (en) * | 1984-06-18 | 1986-01-14 | 日本鋼管株式会社 | Bottom tapping type electric furnace |
| JPS6110499U (en) * | 1984-06-26 | 1986-01-22 | 川崎製鉄株式会社 | Stopper device in bottom pouring melting furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100898248B1 (en) * | 2002-08-22 | 2009-05-18 | 주식회사 포스코 | Apparatus for preventing lump metal by shaking slag pot and detecting weight |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2506240B2 (en) | 1996-06-12 |
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