JP2004162127A - Method for removing dust on skirt sealing part in converter - Google Patents

Method for removing dust on skirt sealing part in converter Download PDF

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Publication number
JP2004162127A
JP2004162127A JP2002329872A JP2002329872A JP2004162127A JP 2004162127 A JP2004162127 A JP 2004162127A JP 2002329872 A JP2002329872 A JP 2002329872A JP 2002329872 A JP2002329872 A JP 2002329872A JP 2004162127 A JP2004162127 A JP 2004162127A
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Japan
Prior art keywords
converter
skirt
seal
dust
gas
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Withdrawn
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JP2002329872A
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Japanese (ja)
Inventor
Kimitoshi Sugino
公俊 杉野
Masaru Watabe
勝 渡部
Katsuhiro Imanaga
克洋 今永
Hiroshi Koyama
弘 小山
Shunkichi Sasaki
俊吉 佐々木
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Nippon Steel Corp
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Nippon Steel Corp
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Priority to JP2002329872A priority Critical patent/JP2004162127A/en
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    • 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
    • Y02P10/25Process efficiency

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for efficiently performing the removal of dust piled on a skirt sealing part in a converter. <P>SOLUTION: In the method for removing the dust on the skirt sealing part in an exhaust gas treating facility in the converter, so as to perform water-sealing by filling a sealing water into an annular groove having U-shaped cross section integrally along a partition cylinder joined with the lower part of a hood forming the lower end part of a flue disposed at the upper part of the furnace throat part in the converter and arranged as ascendable/descendable and by dipping the lower part of the above partition cylinder into the sealing water, a plurality of divided gas header tubes 2 in the circumferential direction are arranged into the sealing water in the above annular groove, and a plurality of gas spouting holes 1 are arranged in lateral direction or further downward in the header tubes to efficiently stir the sealing water. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、転炉炉口の上方に配置した煙道の下端を形成するフード下部に接合した仕切り筒に沿って一体的に、且つ、昇降可能に設けられた断面U形の環状溝内にシール水を満たし、このシール水に前記仕切り筒の下部を浸漬して水封するようにした、転炉排ガス処理設備におけるスカートシール部のダスト除去方法に関するものである。
【0002】
【従来の技術】
転炉排ガス処理設備には、転炉炉口の上方に設置した煙道の下部に形成するフードと転炉との間にスカートが設けてある。これは転炉から発生するCOガスを未燃焼のまま回収するためで、スカートによって完全密封とする必要があるからである。一方、転炉は傾動を行うためスカートは昇降可能である必要がある。
【0003】
一般に、このスカートシールのジャケット部は、スカートの周りに断面U形の環状溝を設け、この環状溝内にシール水を満たし、フード外周に下向きに設けた仕切り筒の下端をシール水に浸漬して水封している。転炉から発生するガスの中には、微細な鉄粉を含んだダストが大量に含まれているため、吹錬中に排ガスによって吹き上げられたダストがスカートのシール部に入り、あるいはスカートを上下させる際に仕切り筒等に付着しているダストがシール水によって洗い落とされ、しだいに環状溝の底部に堆積し、やがて仕切り筒の下端が環状溝の底部に堆積したダストに当たると、スカートの上下動が不能となり、転炉操業を停止せざるを得ないダストトラブルが発生する。
【0004】
このダストトラブルを解決するために、特許文献1には環状溝の底部外側に連通させて設けた出張ボックス内のシール水内に水中ポンプを浸漬し、この水中ポンプにシール水を吸い込んで昇圧し、これを循環水として前記環状溝の複数の噴出ノズルに供給し、噴出ノズルからそれぞれ円周方向に向け噴出する。これにより環状溝内のシール水に強力な円周方向流れを形成し、ダストを攪拌しながらその浮上と輸送を促進する方法が開示されている。
しかしながら、環状溝内にポンプを設置するには、スペース的にかなり制約があり、また、水中ポンプを駆動させるための動力源である電気配線を必要とし、その電気配線は炉体からの熱負荷によって電気配線の設置は非常に困難である。
【0005】
また、別の方法として、特許文献2に記載されているような環状溝内に空気配管を施し空気によって水中のダストを攪拌浮上させるというものがある。
従来、この方法では、図2(A)のように環状溝6内の中央に円周上に沿って配管2を設置し、該配管には攪拌ノズルをほぼ真上に設け圧縮空気を噴出し、環状溝内のシール水を攪拌していた。
【0006】
【特許文献1】
特開平11−279617号公報
【特許文献2】
実公昭52−35933号公報
【0007】
【発明が解決しようとする課題】
前記後者の方法で圧縮気体供給配管が一箇所で供給し、環状溝の底部中央に円周上に沿って一本の圧縮気体噴出配管を設け攪拌ノズルの吐出方向はほぼ真上に向いて攪拌を行うため、供給配管近傍の攪拌ノズルからは盛んに圧縮気体を噴出しダスト攪拌を行っているが、供給管の反対側のノズルからは圧縮気体の吐出量は少なくダスト攪拌能力が弱く、部分的にダストが環状溝底部に堆積しスカートの上下動が不能となるダストトラブルが発生する。このため、定期的に環状溝内からダストを除去する作業が必要となり、ダスト清掃費用の発生、及びそのための転炉休止による転炉稼働率の低下を来たすという問題があった。
【0008】
一方、従来は圧縮気体は常時一定圧力でダスト攪拌を行っていたため、ダストが一部環状溝内底部に堆積し始めても排除されることがなく、いずれはダストが堆積し、スカートの上下動が不能となるトラブルが発生する。
本発明は、転炉スカートシール水内に堆積するダストの除去を効率よく行うことが可能な転炉スカートシール部のダスト除去方法を提供することを目的とする。
【0009】
【課題を解決するための手段】
本発明は、上記課題を解決するものであり、その要旨は、
(1)転炉炉口の上方に配置した煙道の下端を形成するフード下部に接合した仕切り筒に沿って一体的に、且つ、昇降可能に設けられた断面U形の環状溝内にシール水を満たし、このシール水に前記仕切り筒の下部を浸漬して水封するようにした、転炉排ガス処理設備におけるスカートシール部のダスト除去方法において、前記環状溝内のシール水の中に円周方向に複数に分割したガスのヘッダー管を設け、前記ヘッダー管に横向きあるいはそれよりも下向きにガスの吐出孔を複数設け、該吐出孔からのガス吐出により前記シール水を攪拌することを特徴とする転炉スカートシール部のダスト除去方法。
(2)前記スカートの昇降ストロークが所定の値以下となった時、前記シール水攪拌用のガス圧力を一定期間増大させることを特徴とする前記(1)に記載の転炉スカートシール部のダスト除去方法。
(3)自動的にガス圧力を増大及び減少させることを特徴とする前記(2)に記載の転炉スカートシール部のダスト除去方法。
【0010】
【発明の実施の形態】
以下、図面によって本発明を詳細に説明する。
図3は、転炉上部全体をあらわした図である。転炉の炉体17の炉口16上にフード13があり、その下端部にスカート14が設けてある。
スカート14は転炉が傾動するときに干渉しないように上下動可能な構造となっている。且つ、シールを保つために、転炉炉口17の上方に配置した煙道の下端を形成するフード13下部に接合した環状の仕切り筒7に沿って一体的に、且つ、昇降可能に設けられた断面U字形の環状溝6を設け、当該溝内にシール水15を満たし、当該溝が上下してもシールがきれない構造となっている。環状溝6は外壁3、内壁4及び底板8から断面U字形に形成される。
【0011】
図2(A)は、従来のスカートシールジャケットの平面図である。従来は溝のシール水内にガス吐出用の配管(ヘッダー管)2を円周上に1本設け、図2(B)のように通常は、ガス吐出孔1から不活性ガスである窒素を上向きに吐出し、ガスの吐出泡10によってシール水15を攪拌することにより、シール水内のダスト9が堆積、固化しないようにしていた。
しかし、従来方法では、上向きにガスが吐出されるため、水・ダストがガス吐出用配管内に侵入しやすく、排出されずらい。その結果、図2(A)のようにガス吐出配管が1本では、ガス供給元管の近辺はガスがよく出るものの、その反対側は、ガス圧力が低下してガスが所定量に達しない。そのために、ガス吐出用配管内に侵入したダストは、ガス供給元管の反対側に押しやられ、ガス吐出用配管内に図2(C)のように堆積し、ガス吐出孔1からのガス量が低下しダストが溜まりやすくなり時間が経過すると堆積する。
【0012】
また、図2(B)のようにガスのとおる中心部のみダストの堆積は避けられるが、両側はダスト9が堆積してしまうため、とくにガス圧力が低下するガス供給配管より遠い反対側では環状筒の位置が少しでもずれると、ダストが崩れガス吐出孔に堆積することと、堆積したダストによって上下動が妨げられ昇降ストローク不足となる事態が発生していた。
その対応としてガス圧力をあげることも考えられるが、ガス圧力を上げるとガス元管近辺のガスが過大となり、シール水が環状溝からオーバーフローし、転炉内に落下する可能性があるので、それもできない状態であった。
【0013】
それに対し、本発明は、図1のようにしている。
図1(A)は、本発明の一実施例の平面図である。図のようにガス吐出用配管(ヘッダー管)2は円周方向に3分割され、それぞれにガスの元管が接続されている。このことにより、ガス圧力の圧損は緩和されガスの吐出孔1によるガス流量の偏りは小さくなる。
また、図1(B)は環状溝部の縦断面図である。ガス吐出管2の吐出孔1は、横向きあるいはそれよりも下向きとし、水・ダストが配管内に浸入しても排出できるようにしている。そのことによりガス吐出孔1の詰まりが改善され、溝底部全体のシール水15が攪拌される。それにより溝全体が一様にダストの堆積がしにくくなる。
更に、少しでもダストの堆積を防止するため、スカートの昇降位置が任意の位置に達すると(スカートの昇降ストロークが所定の値以下となった時)、一定期間もしくはスカートの昇降位置が別の任意の位置に達するまで自動的にガス圧力を増大させるようにしている。一定期間経過後もしくはスカートの昇降位置が別の任意の位置に達した後は、ガス圧力は自動的に減少する。この動作をこまめに繰り返すことでダストを浮き上がらせ除去するとさらに効果的である。
【0014】
【実施例】
本発明は実機転炉に下記の条件で適用した。

Figure 2004162127
その結果、炉修から炉修の間、一度も環状溝内を掃除することなく、終えることができた。従来方法では、炉修から炉修の間で平均12回の清掃を実施していた。
【0015】
【発明の効果】
本発明の適用により、スカートジャケットに堆積したダスト除去のために転炉を休止することなく、また、その清掃作業もなく、整備コストの削減に寄与することができた。
【図面の簡単な説明】
【図1】本発明方法を実施するための転炉のスカートジャケット部の一例を示す図で、(A)は平面図、(B)は断面図である。
【図2】従来の転炉のスカートジャケット部構造を示す図で、(A)は平面図、(B)は断面図、(C)はダスト堆積状況を示す図である。
【図3】転炉上部周辺全体を示す図である。
【符号の説明】
1 吐出孔 2 吐出管
3 外壁 4 内壁
5 給水本管 6 環状溝
7 仕切り筒 8 底板
9 ダスト 10 吐出泡
11 排出溝 12 環状管
13 フード 14 スカート
15 シール水 16 炉口
17 炉体[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention integrates along a partition tube joined to a lower portion of a hood forming a lower end of a flue disposed above a converter mouth, and in an annular groove having a U-shaped cross section provided so as to be able to move up and down. The present invention relates to a method for removing dust from a skirt seal portion in a converter exhaust gas treatment facility, wherein the skirt seal portion is filled with seal water, and the lower part of the partition tube is immersed in the seal water to seal the water.
[0002]
[Prior art]
In a converter exhaust gas treatment facility, a skirt is provided between a converter and a hood formed below a flue provided above a converter furnace port. This is because the CO gas generated from the converter is recovered without being burned, and the skirt must be completely sealed. On the other hand, since the converter tilts, the skirt needs to be able to move up and down.
[0003]
Generally, the jacket portion of the skirt seal is provided with an annular groove having a U-shaped cross section around the skirt, filled with seal water in the annular groove, and immersed in the seal water at the lower end of the partition tube provided downward on the outer periphery of the hood. Water seal. Since the gas generated from the converter contains a large amount of dust containing fine iron powder, the dust blown up by the exhaust gas during blowing can enter the seal of the skirt or move the skirt up and down. When the dust adhering to the partition tube, etc. is washed off by the sealing water and gradually accumulates on the bottom of the annular groove, and eventually the lower end of the partition tube hits the dust accumulated on the bottom of the annular groove, the upper and lower of the skirt The operation of the converter becomes impossible, causing a dust trouble that has to stop the operation of the converter.
[0004]
In order to solve this dust trouble, in Patent Document 1, a submersible pump is immersed in seal water in a business trip box provided in communication with the bottom outside of the annular groove, and the seal water is sucked into the submersible pump to increase the pressure. This is supplied to the plurality of ejection nozzles of the annular groove as circulating water, and is ejected from the ejection nozzles in the circumferential direction. This discloses a method in which a strong circumferential flow is formed in the seal water in the annular groove, and the floating and transport of the dust are promoted while stirring the dust.
However, the installation of the pump in the annular groove is considerably limited in terms of space, and requires electric wiring as a power source for driving the submersible pump, and the electric wiring is a heat load from the furnace body. Therefore, installation of electric wiring is very difficult.
[0005]
As another method, there is a method in which an air pipe is provided in an annular groove and dust in water is stirred and floated by air as described in Patent Document 2.
Conventionally, in this method, as shown in FIG. 2 (A), a pipe 2 is installed along the circumference in the center of an annular groove 6, and a stirring nozzle is provided on the pipe almost directly above to discharge compressed air. The seal water in the annular groove was stirred.
[0006]
[Patent Document 1]
JP-A-11-279617 [Patent Document 2]
Japanese Utility Model Publication No. 52-35933
[Problems to be solved by the invention]
In the latter method, the compressed gas supply pipe supplies at one point, and a single compressed gas ejection pipe is provided along the circumference at the center of the bottom of the annular groove, and the discharge direction of the stirring nozzle is stirred almost directly upward. To stir the dust, the compressed gas is actively ejected from the stirring nozzle near the supply pipe to perform dust stirring.However, the discharge amount of the compressed gas from the nozzle on the opposite side of the supply pipe is small, and the dust stirring capacity is weak. Dust is deposited on the bottom of the annular groove, and a dust trouble occurs in which the skirt cannot move up and down. For this reason, it is necessary to periodically remove the dust from the inside of the annular groove, and there is a problem that the dust cleaning cost is generated, and the converter operation rate is reduced due to the stoppage of the converter.
[0008]
On the other hand, in the past, the compressed gas was constantly agitated at a constant pressure, so that even if some of the dust started to accumulate at the bottom of the annular groove, it was not eliminated, and eventually the dust accumulated and the skirt moved up and down. Trouble that becomes impossible occurs.
An object of the present invention is to provide a method of removing dust from a converter skirt seal portion, which can efficiently remove dust accumulated in converter skirt seal water.
[0009]
[Means for Solving the Problems]
The present invention is to solve the above problems, the gist of which,
(1) A seal is provided in an annular groove having a U-shaped cross section provided integrally and movably up and down along a partition tube joined to a lower portion of a hood forming a lower end of a flue disposed above a converter furnace opening. In a method for removing dust from a skirt seal portion in a converter exhaust gas treatment facility, the lower part of the partition tube is filled with water and immersed in the seal water to seal the water. A gas header pipe divided into a plurality in the circumferential direction is provided, a plurality of gas discharge holes are provided in the header pipe laterally or downward, and the seal water is stirred by discharging gas from the discharge holes. Method for removing dust from the converter skirt seal.
(2) The dust of the converter skirt seal portion according to (1), wherein when the up-and-down stroke of the skirt becomes a predetermined value or less, the gas pressure for stirring the seal water is increased for a certain period. Removal method.
(3) The method for removing dust from a converter skirt seal according to (2), wherein the gas pressure is automatically increased and decreased.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 3 is a diagram showing the entire upper part of the converter. A hood 13 is provided on a furnace opening 16 of a furnace body 17 of the converter, and a skirt 14 is provided at a lower end thereof.
The skirt 14 has a structure capable of moving up and down so as not to interfere when the converter tilts. In addition, in order to maintain the seal, it is provided integrally and movably up and down along the annular partition tube 7 joined to the lower portion of the hood 13 forming the lower end of the flue disposed above the converter furnace opening 17. A groove U having a U-shaped cross section is provided, the groove is filled with a seal water 15, and a seal is not formed even when the groove moves up and down. The annular groove 6 is formed in a U-shaped cross section from the outer wall 3, the inner wall 4, and the bottom plate 8.
[0011]
FIG. 2A is a plan view of a conventional skirt seal jacket. Conventionally, one gas discharge pipe (header pipe) 2 is provided on the circumference in the seal water of the groove, and nitrogen, which is an inert gas, is usually supplied from the gas discharge hole 1 as shown in FIG. The dust 9 in the seal water is prevented from accumulating and solidifying by discharging upward and stirring the seal water 15 by the gas discharge bubbles 10.
However, in the conventional method, the gas is discharged upward, so that water and dust easily enter the gas discharge pipe and are hardly discharged. As a result, with one gas discharge pipe as shown in FIG. 2 (A), gas is often discharged near the gas supply pipe, but on the other side, the gas pressure decreases and the gas does not reach the predetermined amount. . Therefore, the dust that has entered the gas discharge pipe is pushed to the opposite side of the gas supply pipe, and is deposited in the gas discharge pipe as shown in FIG. And dust tends to accumulate, and accumulates over time.
[0012]
As shown in FIG. 2 (B), dust can be prevented from accumulating only at the center of the gas, but dust 9 accumulates on both sides. If the position of the cylinder is displaced even a little, the dust collapses and accumulates in the gas discharge holes, and the accumulated dust hinders the vertical movement, resulting in a shortage of the elevating stroke.
As a countermeasure, increasing the gas pressure may be considered.However, if the gas pressure is increased, the gas near the gas source pipe becomes excessive, and the seal water may overflow from the annular groove and fall into the converter. I could not do it.
[0013]
In contrast, the present invention is as shown in FIG.
FIG. 1A is a plan view of one embodiment of the present invention. As shown in the figure, a gas discharge pipe (header pipe) 2 is divided into three parts in a circumferential direction, and a gas source pipe is connected to each. As a result, the pressure loss of the gas pressure is reduced, and the deviation of the gas flow rate due to the gas discharge hole 1 is reduced.
FIG. 1B is a longitudinal sectional view of the annular groove. The discharge hole 1 of the gas discharge pipe 2 is directed sideways or downward so that water and dust can be discharged even if they enter the pipe. Thereby, clogging of the gas discharge holes 1 is improved, and the seal water 15 on the entire groove bottom is stirred. This makes it difficult to uniformly deposit dust in the entire groove.
Further, in order to prevent any accumulation of dust, when the up-and-down position of the skirt reaches an arbitrary position (when the up-and-down stroke of the skirt becomes a predetermined value or less), the up-and-down position of the skirt is changed to another arbitrary position. The gas pressure is automatically increased until the position is reached. After a certain period of time or after the skirt has reached another arbitrary position, the gas pressure automatically decreases. It is more effective to raise and remove dust by repeating this operation frequently.
[0014]
【Example】
The present invention was applied to an actual converter under the following conditions.
Figure 2004162127
As a result, between furnace repairs, it was possible to finish without cleaning the inside of the annular groove even once. In the conventional method, cleaning was performed 12 times on average between furnace repairs.
[0015]
【The invention's effect】
By applying the present invention, it is possible to contribute to a reduction in maintenance costs without stopping the converter for removing dust accumulated on the skirt jacket and without cleaning the converter.
[Brief description of the drawings]
FIG. 1 is a view showing an example of a skirt jacket portion of a converter for carrying out the method of the present invention, wherein (A) is a plan view and (B) is a sectional view.
FIGS. 2A and 2B are views showing a skirt jacket structure of a conventional converter, wherein FIG. 2A is a plan view, FIG. 2B is a cross-sectional view, and FIG.
FIG. 3 is a diagram illustrating the entire upper periphery of a converter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Discharge hole 2 Discharge pipe 3 Outer wall 4 Inner wall 5 Water supply main pipe 6 Annular groove 7 Partition cylinder 8 Bottom plate 9 Dust 10 Discharge bubble 11 Discharge groove 12 Annular pipe 13 Hood 14 Skirt 15 Seal water 16 Furnace opening 17 Furnace body

Claims (3)

転炉炉口の上方に配置した煙道の下端を形成するフード下部に接合した仕切り筒に沿って一体的に、且つ、昇降可能に設けられた断面U形の環状溝内にシール水を満たし、このシール水に前記仕切り筒の下部を浸漬して水封するようにした、転炉排ガス処理設備におけるスカートシール部のダスト除去方法において、前記環状溝内のシール水の中に円周方向に複数に分割したガスのヘッダー管を設け、前記ヘッダー管に横向きあるいはそれよりも下向きにガスの吐出孔を複数設け、該吐出孔からのガス吐出により前記シール水を攪拌することを特徴とする転炉スカートシール部のダスト除去方法。A seal water is filled into an annular groove having a U-shaped cross section provided integrally and along a partition tube joined to a lower portion of a hood that forms a lower end of a flue disposed above a converter furnace mouth and capable of ascending and descending. In the method for removing dust of the skirt seal portion in the converter exhaust gas treatment equipment, the lower part of the partition tube is immersed in the seal water to seal the water. A plurality of gas header tubes are provided, and a plurality of gas discharge holes are provided in the header tube laterally or downward, and the seal water is stirred by discharging gas from the discharge holes. How to remove dust from the furnace skirt seal. 前記スカートの昇降ストロークが所定の値以下となった時、前記シール水攪拌用のガス圧力を一定期間増大させることを特徴とする請求項1記載の転炉スカートシール部のダスト除去方法。2. The method for removing dust from a skirt seal portion of a converter according to claim 1, wherein the gas pressure for agitating the seal water is increased for a certain period when the elevating stroke of the skirt becomes a predetermined value or less. 自動的にガス圧力を増大及び減少させることを特徴とする請求項2記載の転炉スカートシール部のダスト除去方法。3. The method of removing dust from a converter skirt seal according to claim 2, wherein the gas pressure is automatically increased and decreased.
JP2002329872A 2002-11-13 2002-11-13 Method for removing dust on skirt sealing part in converter Withdrawn JP2004162127A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015157978A (en) * 2014-02-24 2015-09-03 新日鐵住金株式会社 Dust removal method in converter skirt seal part

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015157978A (en) * 2014-02-24 2015-09-03 新日鐵住金株式会社 Dust removal method in converter skirt seal part

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