JPH01201411A - Method for preventing flow-out of molten slag at the time of steel tapping from refining furnace - Google Patents
Method for preventing flow-out of molten slag at the time of steel tapping from refining furnaceInfo
- Publication number
- JPH01201411A JPH01201411A JP2677888A JP2677888A JPH01201411A JP H01201411 A JPH01201411 A JP H01201411A JP 2677888 A JP2677888 A JP 2677888A JP 2677888 A JP2677888 A JP 2677888A JP H01201411 A JPH01201411 A JP H01201411A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- molten steel
- molten
- steel
- molten 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 29
- 239000002893 slag Substances 0.000 title claims abstract description 27
- 238000007670 refining Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、転炉等の精錬炉において出鋼時に生ずる溶
融スラグの流出を防止するための方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for preventing the outflow of molten slag that occurs during tapping in a refining furnace such as a converter.
〔従来の技術］
例えば、転炉において精錬を終了した溶鋼は、炉体上部
側面に設けられた出鋼口が下方に向くように炉体を傾動
させることにより、出鋼口を通してその下方に位置する
取鍋に排出される。、このとき、溶鋼表面に浮遊してい
る溶融スラグの一部が溶鋼に混入し、溶鋼と共に取鍋内
に流出する。このように、取鍋内に排出された溶鋼中に
溶融スラグが混入していると、製品品質が劣化し且つ鋳
造作業にも支障を招く。[Prior art] For example, molten steel that has been refined in a converter is placed below the tap hole through the tap hole by tilting the furnace body so that the tap hole provided on the upper side of the furnace body faces downward. It is discharged into a ladle. At this time, a part of the molten slag floating on the surface of the molten steel mixes with the molten steel and flows into the ladle together with the molten steel. As described above, if molten slag is mixed into the molten steel discharged into the ladle, the product quality will deteriorate and the casting operation will also be hindered.
〔発明が解決しようとする課題］
そこで、従来、転炉の出鋼口から取鍋内に流出する溶鋼
流を、作業員が監視し、？８鋼流中に溶融スラグが混入
したら、溶鋼の流出を止めることが行なわれていた。し
かしながら、このような方法では、溶融スラグの混入流
出を確実に防止することができず、特に、無酸化出鋼の
場合には、出鋼口と取鍋との間がカバーによって遮蔽さ
れ、出鋼口からの溶鋼流が目視できないため、上述の方
法は実施不可能であった。 ′・
１１また、転炉の出鋼口直上の溶融金属中に、溶鋼と溶
融スラグとの中間の比重を有するスラグボールを浮遊さ
せ、溶融スラグが流出する出鋼末期には、スラグポール
によって出鋼口を閉鎖し、溶融スラグの流出を防止する
方法も試みられているが、このような方法でも、溶融ス
ラグの流出を確実に防止することはできない。[Problems to be Solved by the Invention] Conventionally, workers monitor the flow of molten steel flowing into the ladle from the tapping port of the converter. 8. If molten slag mixed into the steel stream, the flow of molten steel was stopped. However, with this method, it is not possible to reliably prevent molten slag from entering and flowing out, and in particular, in the case of non-oxidized steel tapping, the space between the tapping port and the ladle is shielded by a cover, and the molten slag cannot be reliably prevented from entering and flowing out. The above method was not possible because the flow of molten steel from the steel mouth could not be visually observed. ′・
11 In addition, a slag ball having a specific gravity intermediate between that of molten steel and molten slag is suspended in the molten metal directly above the tapping port of the converter, and at the end of tapping when the molten slag flows out, a slag pole is used to close the tapping port. Attempts have been made to close the molten slag and prevent the molten slag from flowing out, but even such methods cannot reliably prevent the molten slag from flowing out.
従って、この発明の目的は、転炉等の精錬炉から、その
出鋼口を通して精錬を終了した溶鋼を排出するに当り、
溶融スラグの流出を確実に防止することができる方法を
提供することにある。Therefore, an object of the present invention is to discharge molten steel that has been refined from a refining furnace such as a converter through its tapping port.
An object of the present invention is to provide a method that can reliably prevent outflow of molten slag.
本発明者等は、上述した問題を解決すべく鋭意研究を重
ねた。出鋼口から流出する溶鋼流中に溶融スラグが混入
する原因は、上記溶鋼流によって出鋼口上方の溶鋼中に
吸込み渦が発生するからである。即ち、出鋼口からの吸
込み渦の高さが高いと、溶融スラグの混入が発生する。The present inventors have conducted extensive research in order to solve the above-mentioned problems. The reason why molten slag is mixed into the molten steel flow flowing out from the tap is that the molten steel flow generates a suction vortex in the molten steel above the tap. That is, if the height of the suction vortex from the tapping port is high, molten slag will be mixed in.
そこで、吸込み渦の発生高さと出鋼口のノズル径との関
係を調べたところ、第２図に示すような関係にあること
がわかった。即ち、出鋼口のノズル径が大になるほど吸
込み渦発生高さは高くなる。Therefore, when we investigated the relationship between the height of the suction vortex and the nozzle diameter of the tapping port, we found that there was a relationship as shown in Figure 2. That is, the larger the nozzle diameter of the tapping port, the higher the suction vortex generation height.
現在−船釣な転炉である容量２５０Ｔでノズル径が１７
０〜２２０ｍｍの場合の吸込み渦発生高さは、約２２５
〜２７５ｍ＊であり、このような高さであると溶融スラ
グの巻込みが発生する。Currently - Boat fishing converter with a capacity of 250T and a nozzle diameter of 17
The suction vortex generation height in the case of 0 to 220 mm is approximately 225
~275m*, and at such a height, molten slag entrainment occurs.
従って、ノズル径即ちノズルを通って流出する溶鋼の相
対流出速度を遅くすれば、吸込み渦発生高さは低くなり
、溶融スラグの流出が防止されることがわかった。Therefore, it has been found that by decreasing the nozzle diameter, that is, the relative outflow speed of molten steel flowing out through the nozzle, the suction vortex generation height can be lowered and the outflow of molten slag can be prevented.
この発明は、上記知見に基づいてなされたものであって
、精錬炉の出鋼口を形成するノズルの外周に、前記ノズ
ルを囲んで電磁ポンプを設け、精錬を終った溶鋼を、前
記精錬炉から前記ノズルを通して排出する際に、前記電
磁ポンプを作動させ、前記電磁ポンプにより発生した電
磁力によって、前記ノズルを通る溶鋼流の径を小さくす
ることにより、前記ノズルの上方の溶鋼に発生する吸込
み渦の高さを低くなし、かくして、前記精錬炉内の前記
溶鋼の表面に浮遊する溶融スラグの、前記ノズルからの
流出を防止したことに特徴を有するものである。This invention was made based on the above knowledge, and an electromagnetic pump is provided on the outer periphery of a nozzle that forms a tapping port of a refining furnace, surrounding the nozzle, and the molten steel that has been refined is transferred to the refining furnace. When discharging the molten steel through the nozzle, the electromagnetic pump is activated, and the electromagnetic force generated by the electromagnetic pump reduces the diameter of the molten steel flow passing through the nozzle, thereby reducing the suction generated in the molten steel above the nozzle. The present invention is characterized in that the height of the vortex is made low, thereby preventing the molten slag floating on the surface of the molten steel in the refining furnace from flowing out from the nozzle.
次に、この発明を図面を参照しながら説明する。Next, the present invention will be explained with reference to the drawings.
第１図は、この発明の一実施態様を示す転炉の出鋼口部
分の垂直断面図である。第１図に示すように、転炉１の
出鋼口２には、耐火物からなるノズル３が設けられてい
る。ノズル３の外周には、ノズル３を囲んで電磁ポンプ
４が設けられている。FIG. 1 is a vertical cross-sectional view of a tap port portion of a converter showing one embodiment of the present invention. As shown in FIG. 1, a tap hole 2 of a converter 1 is provided with a nozzle 3 made of a refractory material. An electromagnetic pump 4 is provided on the outer periphery of the nozzle 3 to surround the nozzle 3.
転炉ｌによる精錬が終了したときは、転炉１をその出鋼
口２が下方に向くように傾動させ、ノズル３を通して転
炉１内の溶鋼５を、ノズル３の下方に位置する取鍋に排
出する。When the refining in the converter 1 is completed, the converter 1 is tilted so that the tapping port 2 faces downward, and the molten steel 5 in the converter 1 is poured into the ladle located below the nozzle 3 through the nozzle 3. to be discharged.
上述のようにして行なわれる出鋼の末期に、電磁ポンプ
４を作動させる。その結果、ノズル３を通る溶鋼５に対
してその流れる方向と直角の方向に電磁力が作用し、こ
の電磁力によって、ノズル３を通る溶鋼流の径が小さく
なる。従って、ノズル３の径を小さくしたと同じ作用が
働き、第２図に示したように、吸込み渦の発生高さが低
くなる結果、溶融５の表面に浮遊する溶融スラグ６がノ
ズル３を通って流出することが防止される。The electromagnetic pump 4 is activated at the end of the tapping process as described above. As a result, an electromagnetic force acts on the molten steel 5 passing through the nozzle 3 in a direction perpendicular to the direction in which it flows, and this electromagnetic force reduces the diameter of the molten steel flow passing through the nozzle 3. Therefore, the same effect as when the diameter of the nozzle 3 is made smaller works, and as a result, as shown in FIG. This prevents leakage.
更に、ノズル３を通る溶鋼流に電磁力が作用することに
よって、溶鋼温度を上昇させることができ、出鋼時にお
ける溶鋼温度のロスを減少させることができる。Furthermore, by applying electromagnetic force to the molten steel flow passing through the nozzle 3, the molten steel temperature can be increased, and the loss of molten steel temperature during tapping can be reduced.
本発明者等が行なった試験によれば、上述のような制御
を行なわせための電磁ポンプ４の好ましい電磁力は、約
１５００Ｇａｕｓｓである。According to tests conducted by the present inventors, the preferred electromagnetic force of the electromagnetic pump 4 for performing the above-described control is about 1500 Gauss.
次に、この発明を実施例により説明する。容量２５０Ｔ
の転炉によって精錬された溶鋼を、前記転炉を傾動させ
、その出鋼口に設けられた直径２２０ｍのノズルを通し
て、出鋼口の下方に配置された取鍋内に排出した。溶鋼
の深さが２５０ ＋ｕ＋以下になった出鋼末期に、ノズ
ルの外周に設けられた電磁力が約１５００ Ｇａｕｓｓ
の電磁ポンプを作動させた。Next, the present invention will be explained using examples. Capacity 250T
The molten steel refined by the converter was discharged into a ladle located below the tap by tilting the converter and passing through a nozzle with a diameter of 220 m provided at the tap. At the final stage of tapping when the depth of the molten steel is less than 250 Gauss, the electromagnetic force provided on the outer periphery of the nozzle
The electromagnetic pump was activated.
この結果、取鍋内に排出された溶鋼中には、殆んど溶融
スラグが混入しなかった。なお、出鋼時間は２０分であ
り、出鋼中における溶鋼温度の低下は殆んど生じなかっ
た。As a result, almost no molten slag was mixed into the molten steel discharged into the ladle. The tapping time was 20 minutes, and the molten steel temperature hardly decreased during tapping.
以上述べたように、この発明によれば、転炉等の精諌炉
から、その出鋼口を通して精錬を終了したｔ容鋼を排出
するに当り、溶融スラグの流出を確実に防止することが
でき、従って、製品品質が劣化することはなく、鋳造作
業を円滑に行なうことができる工業上有用な効果がもた
らされる。As described above, according to the present invention, it is possible to reliably prevent molten slag from flowing out when t-sized steel that has been refined is discharged from a refiner such as a converter through its tapping port. Therefore, there is no deterioration in product quality, and an industrially useful effect is brought about in which the casting work can be carried out smoothly.
第１図はこの発明の一実施態様を示す転炉の出鋼口部分
の垂直断面図、第２図は出鋼口のノズル径と吸込み渦発
生高さとの関係を示すグラフである。図面において、
１・・・転炉、 ２・・・出鋼口、３・・・
ノズル、 ４・・・電磁ポンプ、５・・・溶
鋼、 ６・・・溶融スラグ。FIG. 1 is a vertical cross-sectional view of the tapping port portion of a converter showing one embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the nozzle diameter of the tapping port and the suction vortex generation height. In the drawings, 1... converter, 2... tapping port, 3...
Nozzle, 4... Electromagnetic pump, 5... Molten steel, 6... Molten slag.
Claims (1)
を囲んで電磁ポンプを設け、精錬を終った溶鋼を、前記
精錬炉から前記ノズルを通して排出する際に、前記電磁
ポンプを作動させ、前記電磁ポンプにより発生した電磁
力によって、前記ノズルを通る溶鋼流の径を小さくする
ことにより、前記ノズルの上方の溶鋼に発生する吸込み
渦の高さを低くなし、かくして、前記精錬炉内の前記溶
鋼の表面に浮遊する溶融スラグの、前記ノズルからの流
出を防止することを特徴とする、精錬炉からの出鋼時に
おける溶融スラグの流出防止方法。An electromagnetic pump is provided on the outer periphery of a nozzle that forms a tap port of the refining furnace, surrounding the nozzle, and the electromagnetic pump is operated when discharging the refined molten steel from the refining furnace through the nozzle, By reducing the diameter of the molten steel flow passing through the nozzle by the electromagnetic force generated by the electromagnetic pump, the height of the suction vortex generated in the molten steel above the nozzle is reduced, and thus the height of the suction vortex generated in the molten steel above the nozzle is reduced. A method for preventing outflow of molten slag during tapping from a refining furnace, characterized by preventing outflow of molten slag floating on the surface of molten steel from the nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2677888A JPH01201411A (en) | 1988-02-08 | 1988-02-08 | Method for preventing flow-out of molten slag at the time of steel tapping from refining furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2677888A JPH01201411A (en) | 1988-02-08 | 1988-02-08 | Method for preventing flow-out of molten slag at the time of steel tapping from refining furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01201411A true JPH01201411A (en) | 1989-08-14 |
Family
ID=12202758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2677888A Pending JPH01201411A (en) | 1988-02-08 | 1988-02-08 | Method for preventing flow-out of molten slag at the time of steel tapping from refining furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01201411A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008290122A (en) * | 2007-05-25 | 2008-12-04 | Hitachi Cable Ltd | Method for producing copper alloy wire |
| CN105714013A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Control method for vortex slag entrapment during converter tapping |
-
1988
- 1988-02-08 JP JP2677888A patent/JPH01201411A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008290122A (en) * | 2007-05-25 | 2008-12-04 | Hitachi Cable Ltd | Method for producing copper alloy wire |
| CN105714013A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Control method for vortex slag entrapment during converter tapping |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5382004A (en) | Tundish slag stopper with sealing rim | |
| KR930001329B1 (en) | Discharging molten metal from a smelting furnace | |
| US5083754A (en) | Apparatus for retaining slag during the discharge of molten metal from a tundish | |
| JP2007069236A (en) | Method for continuously casting molten metal | |
| JPH01201411A (en) | Method for preventing flow-out of molten slag at the time of steel tapping from refining furnace | |
| KR101696731B1 (en) | Convertor and method of controlling the same | |
| EP0583253B1 (en) | Taphole design and pouring method | |
| EP1183397B1 (en) | Method and device for tapping molten metal from metallurgical vessels | |
| KR101264634B1 (en) | Tapping spout structure for converter | |
| JPH01201410A (en) | Method for preventing flow-out of molten slag at tapping of steel from refining furnace | |
| KR970009086B1 (en) | Container for steel making | |
| JPS60210352A (en) | Prevention of outflow of slag from tap hole of vessel for molten metal | |
| RU2004598C1 (en) | Chute for discharge and modification of cast iron | |
| CA2139889C (en) | Tundish slag stopper with sealing rim | |
| JPH0478690B2 (en) | ||
| JPS62230930A (en) | Method for discharging molten metal | |
| JPH0763484A (en) | Molten steel outlet nozzle on bottom of melting furnace | |
| US4733853A (en) | Molten metal taphole design to improve yield and cleanliness | |
| KR950010713B1 (en) | Stamping method of tap hole with converter | |
| KR100930513B1 (en) | Slag for preventing slag spills for ladles | |
| JPS63317615A (en) | Method for preventing slag mixing flow at discharging time of molten metal | |
| KR20040013213A (en) | Slag dart typed by prohibiting slag into ladle | |
| SU1397497A1 (en) | Tuyere | |
| KR100328938B1 (en) | Device for preventing outflow of slag in converter | |
| JPH01129921A (en) | Steel tapping hole for converter |