JPS627809A - Method for refining molten iron in spout - Google Patents

Abstract

PURPOSE:To inhibit the erosion of the bottom of a molten iron spout and to prolong the life of a blowing lance by bringing the top of the lance into contact with the bottom of the spout and blowing a refining agent into molten iron from horizontal injection nozzles with a carrier gas. CONSTITUTION:The top of a blowing lance 2 having horizontal injection nozzles near the top is brought into contact with the bottom of a molten iron spout 1, pressed and fixed. A refining agent F such as a desiliconizing agent is blown into molten iron M flowing in the spout 1 in the direction of arrows from the nozzles with a carrier gas C to refine the molten iron M in the spout 1. By this structure, the local erosion of the bottom of the spout 1 is inhibited to reduce the frequency of repair, and since the lance 2 is fixed, the damage of the lance 2 by cracking is prevented to prolong the life.

Description

【発明の詳細な説明】 ［産業上の利用分野１ 本発明は溶鉄樋オｈ錬方法に関し、特に精錬剤のインジ
ェクション吹込み法によって受ける溶鉄樋下面の侵食を
抑制して補修頻度を低減すると共に、精錬剤吹込みラン
スの延命化を図る技術に関するものである。尚本明細書
では、高炉から出湯される溶銑を鋳床上で連続的に脱珪
処理する方法を主体にして説明するが、本発明は勿論こ
れに限定される訳ではなく、溶銑や溶鋼を樋通過々程で
連続的に脱燐或は脱硫する等の様な各種処理方法におい
て同様に適用することができる。[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a molten iron gutter refining method, in particular, a method for suppressing erosion of the lower surface of a molten iron gutter caused by a refining agent injection blowing method and reducing repair frequency. , relates to technology for extending the life of refining agent injection lances. Although this specification mainly describes a method for continuously desiliconizing molten pig iron tapped from a blast furnace on a cast bed, the present invention is of course not limited to this method. It can be similarly applied to various treatment methods such as continuous dephosphorization or desulfurization during passing.

［従来の技術］ 取鍋脱珪法に代わる比較的新しい脱珪法として、高炉か
ら出湯されて鋳床の出銑樋を流れる溶銑に脱珪剤を投入
し、取鍋へ受は入れるまでに脱珪処理を完了してしまう
溶銑樋脱珪法が普及してきている。即ちこの方法には、
■溶銑樋を流れる溶銑に脱珪剤を投入し、溶銑の流れに
よって生じる攪拌効果を利用して脱珪剤を溶銑中に巻込
んで脱珪を行なう方法１．■上記方法では攪拌巻込み効
果が弱いことに鑑み、溶銑樋を流れる溶銑中にインジェ
クションランスを突込み、該ランスからキャリヤガスと
共に粉粒状の脱珪剤を吹込んで、溶銑と脱珪剤の反応を
促進させる方法、及び■上記■の方法では後述の様な問
題がある為ランスの侵食を防止すべくギヤリヤガスと共
に粉粒状の脱珪剤を吹付け、溶銑流と該吹付けによって
生じる攪拌力を利用して脱珪剤と溶銑の接触効率を高め
、脱珪効率を向上させる方法が知られており、何れも溶
銑樋を流下する過程で脱珪を進めることができるので、
極めて能率の高い方法として賞月されている。殊に■の
方法では、ランスからのガス吹込みに伴なうバブリング
と溶銑の乱流による攪拌が重なって発揮され攪拌効率が
高まる為、高レベルの脱珪効率が発揮されるものと考え
られている。[Conventional technology] As a relatively new desiliconization method that replaces the ladle desiliconization method, a desiliconization agent is added to the hot metal that is tapped from the blast furnace and flows through the tap trough of the casthouse, and the process is carried out until it is introduced into the ladle. The hot metal trough desiliconization method, which completes the desiliconization process, is becoming popular. That is, this method includes:
■A method in which a desiliconizing agent is poured into the hot metal flowing through the hot metal gutter, and the desiliconizing agent is drawn into the hot metal using the stirring effect caused by the flow of the hot metal to perform desiliconization.1. ■ Considering that the stirring entrainment effect is weak in the above method, an injection lance is inserted into the hot metal flowing through the hot metal trough, and a granular desiliconizing agent is injected from the lance together with a carrier gas to cause the reaction between the hot metal and the desiliconizing agent. Method to accelerate the process, and ■The method described in ■ above has the following problems, so in order to prevent corrosion of the lance, a granular desiliconizing agent is sprayed together with the gear rear gas, and the hot metal flow and the stirring force generated by the spraying are used. There are known methods to improve the desiliconization efficiency by increasing the contact efficiency between the desiliconizing agent and the hot metal.
It has been praised as an extremely efficient method. In particular, method (2) is thought to achieve a high level of desiliconization efficiency because the bubbling caused by the gas injection from the lance and the stirring caused by the turbulent flow of the hot metal combine to increase the stirring efficiency. ing.

［発明が解決しようとする問題点］ ところが上記■の方法にも全く問題がない訳ではなく、
下記の様な改善すべき種々の問題が残されており、こう
した問題は橋上で精錬（脱燐、脱硫等）を行なう場合に
ついての共通の欠点と言える。[Problems to be solved by the invention] However, the above method (■) is not completely free from problems.
Various problems remain to be improved as described below, and these problems can be said to be common drawbacks when refining (dephosphorization, desulfurization, etc.) is carried out on bridges.

■脱珪剤はランス最先端部に開口したノズルからキャリ
ヤガスと共に下向きに吹込まれるが、この吹込み流によ
って溶銑樋の下面が局部的に侵食される為、溶銑樋とし
ての寿命が著しく短縮される。■Desilicating agent is blown downward along with carrier gas from a nozzle opened at the tip of the lance, but this blowing flow locally erodes the lower surface of the hot metal trough, significantly shortening its life as a hot metal trough. be done.

■脱珪剤吹込みランスは湯面上方から垂下されて先端の
一部が溶銑内に浸漬される為、該浸漬部、殊にスラグラ
イン付近では生成スラグの侵食作用を受けてかなり損耗
する。しかも上方で片持ち状態になっているに過ぎない
ランスは、高質量の溶銑の急速な流れ（比重：約６．７
、流速：約８０ｃ■／５ｅｃ）を受けて著しく振動する
他、脱珪剤の吹込み時に受ける衝撃的反作用（以下単に
ショックという）を受ける為、ランス自体に微細なりラ
ックが発生し易い、この様なりラックが発生すると、こ
のクラック内に溶銑又はスラグが侵入して侵食が著しく
促進される為、ランス先端が短時間のうちに破壊してし
まう。(2) Since the desiliconizing agent injection lance is suspended from above the hot metal surface and a portion of its tip is immersed in the hot metal, the immersed portion, especially near the slag line, is subject to considerable wear due to the erosion of the produced slag. Moreover, the lance, which is only cantilevered above, is exposed to a rapid flow of high-mass hot metal (specific gravity: approximately 6.7
, flow velocity: approximately 80c/5ec), causing significant vibration, and also being subjected to an impact reaction (hereinafter simply referred to as shock) during the injection of the desiliconizing agent, which tends to cause minute racks on the lance itself. When such a rack occurs, hot metal or slag enters into the crack and corrosion is significantly accelerated, resulting in the lance tip being destroyed in a short period of time.

■脱珪剤吹込み位置のスラグライン付近で生ずる侵食は
ランスばかりでなく溶銑樋の側壁部でも急速に進行し、
溶銑樋の寿命を短縮する他の原因となっている。■Erosion that occurs near the slag line where the desiliconizing agent is injected rapidly progresses not only on the lance but also on the side wall of the hot metal trough.
This is another cause of shortening the life of hot metal sluices.

■インジェクションに伴うバブリングによって溶銑が湯
面から機外へ飛散する為非常に危険であり、且つ溶銑ロ
スにもつながる。■Bubbling that accompanies injection causes hot metal to scatter from the hot metal surface to the outside of the machine, which is extremely dangerous and also leads to loss of hot metal.

この様な背景の下で前記■の方法が開発されてきたが、
■の方法では溶銑の飛散が激しく、飛散防止の観点から
吹付は速度を低下させる等の対策が必要であり、実用性
が少ない、そこで再び■の方法に戻らざるを得なくなる
という状況であり、■の方法を実施するに当たっては、
前記■として示した溶鉄樋の侵食を可及的に抑制すると
共に、同じく■として示した精錬剤吹込みランスの損耗
を抑制して延命化を図るこが重大な課題となっている。Against this background, the method (■) above has been developed, but
Method (2) causes the hot metal to scatter violently, and measures such as slowing down the spraying speed are required to prevent scattering, making it less practical, so we have no choice but to return to method (2). When implementing method ■,
It is an important issue to suppress the erosion of the molten iron gutter shown in (2) as much as possible, and to extend the life of the refining agent injection lance by suppressing the wear and tear of the refining agent injection lance shown in (2).

尚＠及びＯに述べた欠点については別の観点から改良研
究を重ね、別途特許出願した。Regarding the shortcomings mentioned in @ and O, we have carried out improvement research from a different perspective, and have filed a separate patent application.

［問題点を解決する為の手段］ Ｌ記の課題を解決し得た本発明の溶鉄樋精錬方法とは、
先端付近から横向きに噴出ノズルを開口した精錬剤吹込
みランスの最先端面を溶鉄樋の下面に当接し、該溶鉄樋
中を流れる溶鉄にキャリヤガスと共に精錬剤を吹込むと
ころに要旨を有するものである。[Means for solving the problems] The molten iron gutter refining method of the present invention that can solve the problems listed in L is as follows:
The gist of this lance is that the most advanced surface of a refining agent injection lance, which has a nozzle opening sideways from near the tip, contacts the lower surface of a molten iron gutter, and the refining agent is injected together with a carrier gas into the molten iron flowing in the molten iron gutter. It is.

［作用］ 本発明に係る溶鉄樋精錬法の基本的な構成は前記■に示
した所謂脱珪剤インジェクション法に従うものであるが
前記■、■の問題点を改善する為、精錬剤吹込みランス
（以下単にランスと言う）の構成及び設置法に工夫を加
えている。即ち後記実施例でも明らかにする様に本発明
では、ランス先端部に開口されるノズルを横向きに形成
すると共に、該ランスの先端を溶鉄樋の下面に当接して
押付は固定するものであり、こうした構成とすることに
よって次の様な作用が発揮される。[Function] The basic structure of the molten iron gutter refining method according to the present invention follows the so-called desiliconizing agent injection method shown in (1) above, but in order to improve the problems of (2) and (4) above, a refining agent injection lance is used. (hereinafter simply referred to as the lance), we have added some innovation to the configuration and installation method. That is, as will be made clear in the examples below, in the present invention, the nozzle opened at the tip of the lance is formed horizontally, and the tip of the lance is pressed against the lower surface of the molten iron gutter to be fixed. With this configuration, the following effects are achieved.

（イ）精錬剤はランスの先端から横向きに吹込まれるの
で、溶鉄樋の下面が局部的に侵食を受ける様な恐れがな
くなり、溶鉄樋の寿命を延長することができる。ちなみ
に高炉鋳床に形成される溶鉄樋はその構築作業面の制約
から局部的な補修が極めて困難であり、特に下面部が部
分的に破損した場合ですら溶鉄樋前端を構築しなければ
ならず、下面部の局部破損は溶鉄樋全体に破損と同列視
する必要がある為、局部的な侵食を抑制することによっ
て全体の寿命を大幅に延長することができる。(a) Since the refining agent is injected sideways from the tip of the lance, there is no fear that the lower surface of the molten iron gutter will be locally eroded, and the life of the molten iron gutter can be extended. By the way, it is extremely difficult to locally repair the molten iron gutter formed in the blast furnace casthouse due to constraints on the construction work, and even if the lower surface is partially damaged, the front end of the molten iron gutter must be constructed. , Local damage to the bottom surface must be considered the same as damage to the entire molten iron gutter, so by suppressing local erosion, the overall life can be significantly extended.

（ｒｌ）ランスの先端を溶鉄樋の下面に当接して押付は
固定することによってランスの振動が激減し、ランス先
端部におけるクラックの発生が大幅に抑制される。先に
説明した様に精錬剤インジェクション法ではランス先端
を溶銑中へ浸漬して精錬剤の吹込みが行なわれる為、該
浸漬部の侵食劣化を回避することはできない、しかし溶
銑流の衝突或は精錬剤の吹込みもショックによる衝撃に
よってランス先端の耐火物にクラックが発生すると、該
クラックに溶湯がさし込んで侵食が著しく加速される為
、耐火物が短時間で崩壊してしまう、ところが上記の様
にランスの先端を溶鉄樋の下面に当接して押付は固定し
ておくと、前述の様な衝撃を受けた場合でもランスの振
動がなくなってクラックの発生は防止され、耐火物の損
耗を著しく抑制することができる。(rl) By bringing the tip of the lance into contact with the lower surface of the molten iron gutter and fixing the pressing, the vibration of the lance is drastically reduced, and the occurrence of cracks at the tip of the lance is greatly suppressed. As explained earlier, in the refining agent injection method, the tip of the lance is immersed in the hot metal and the refining agent is injected, so erosion and deterioration of the immersed part cannot be avoided, but collision of the hot metal flow or When a refining agent is injected, if a crack occurs in the refractory at the tip of the lance due to the shock, the molten metal penetrates into the crack and accelerates erosion, causing the refractory to collapse in a short period of time. As mentioned above, if the tip of the lance is kept in contact with the bottom surface of the molten iron gutter and the pressure is fixed, even if the lance receives an impact as mentioned above, the lance will not vibrate and cracks will be prevented, and the refractory Wear and tear can be significantly suppressed.

［実施例］ 以下、溶銑樋脱珪法を主体とし実施例図面に沿って本発
明の構成及び作用効果を一層明確にす第１図は本発明の
実施例を示す概略説明図であり、第１図（Ａ）は概略平
面図、第１図（Ｂ）は概略縦断面図、第１図（Ｃ）は概
略横断面図を夫々示し、図中１は溶銑樋、２はランス、
Ｍは溶銑、Ｓはスラグ、Ｆは脱珪剤、Ｃはキャリヤガス
、矢印は溶銑の流れを夫々示す。[Example] Hereinafter, the configuration and effects of the present invention will be further clarified with reference to the drawings of the embodiment, mainly focusing on the hot metal trough desiliconization method. 1(A) is a schematic plan view, FIG. 1(B) is a schematic vertical cross-sectional view, and FIG. 1(C) is a schematic cross-sectional view. In the figures, 1 is a hot metal gutter, 2 is a lance,
M is hot metal, S is slag, F is a desiliconizing agent, C is a carrier gas, and arrows indicate the flow of hot metal.

これらの図からも明らかな様に本発明では、ランス２の
先端部に脱珪剤吹込みノズル２ａを横向きに開口する他
、該ランス２の先端を溶銑樋１の底面に当接して押付は
固定し、ランスｌ上方部に位置するランス支持装置（図
面に表われない）の支持効果とも相まってランス１が両
持ちの状態となって動かない様に定置されることになり
、この状態でノズル２ａからキャリヤガスＣと共に脱珪
剤を溶銑Ｍ中に吹込む、尚溶銑樋ｌ底面に対するランス
２先端部の押付は固定は、凹凸或は段部を利用した係合
乃至嵌合的固定であってもよいが。As is clear from these figures, in the present invention, in addition to opening the desiliconizing agent injection nozzle 2a sideways at the tip of the lance 2, the tip of the lance 2 is brought into contact with the bottom surface of the hot metal trough 1 and pressed. In combination with the supporting effect of the lance support device (not shown in the drawing) located above the lance 1, the lance 1 is held in place so that it does not move, and in this state, the nozzle The desiliconizing agent is blown into the hot metal M together with the carrier gas C from 2a, and the tip of the lance 2 is pressed and fixed against the bottom surface of the hot metal trough l by engagement or fitting fixation using unevenness or steps. It's okay though.

通常はランスｌ自身の自重（通常４００〜５００にｇ程
度）を利用し、樋底面に載置するだけでも十分に固定す
ることができる。更に昇降装置による降下刃を付加すれ
ばより確実である。Normally, the lance l can be sufficiently fixed by simply placing it on the bottom of the gutter by utilizing its own weight (usually about 400 to 500 g). Furthermore, it will be more reliable if a lowering blade is added using a lifting device.

この様な構成を採用すると、ランスｌ先端部に横向きの
ノズル２ａが開口されており、脱珪剤Ｆ及びキャリヤガ
スＣはこのノズル２ａから横向きに吹込まれる為、少な
くとも溶銑樋ｌの底面が局部的に侵食を受ける様な恐れ
がなく、溶銑樋ｌの寿命を延長することができる。ちな
みに脱珪剤インジェクション法を利用した従来の溶銑樋
脱珪では、第２図（縦断面略図）に示す如くノズル２ａ
が下向きに開口されており、底面に向けて脱珪剤Ｆ及び
キャリヤガスＣが高速で吹込まれる為１図示する様にノ
ズル２ａに対面する耐火物が急速に局部侵食を受け、短
期間のうちに再構築を余儀なくされる。ところが本発明
では前述の如く樋底面の局部侵食が起こらないので溶銑
樋ｌ全体の寿命、　が著しく延長され、再構築の頻度を
激減することができる。When such a configuration is adopted, a horizontal nozzle 2a is opened at the tip of the lance l, and since the desiliconizing agent F and carrier gas C are blown horizontally from this nozzle 2a, at least the bottom surface of the hot metal trough l is exposed. There is no fear of local erosion, and the life of the hot metal sluice can be extended. By the way, in conventional hot metal trough desiliconization using the desiliconizing agent injection method, as shown in Fig. 2 (schematic longitudinal section), the nozzle 2a
The nozzle 2a is opened downward, and the desiliconizing agent F and carrier gas C are blown toward the bottom at high speed. As shown in Figure 1, the refractory facing the nozzle 2a undergoes rapid local erosion, resulting in short-term damage. We will be forced to rebuild. However, in the present invention, as mentioned above, local erosion of the bottom surface of the gutter does not occur, so the life of the entire hot metal gutter can be significantly extended, and the frequency of rebuilding can be drastically reduced.

しかも第２図に示した様な従来の溶銑樋脱珪法では、ラ
ンス２が溶銑内へ所謂「中ぶらり」の状態で垂下されて
いる為、前述の如く高比重で高速の溶銑流を常時受ける
該ランスは激しく振動し、脱珪剤及びキャリヤガスの吹
込みショックに伴う衝撃とも相まってその振動は一段と
激しくなる。Moreover, in the conventional hot metal trough desiliconization method as shown in Figure 2, the lance 2 is suspended into the hot metal in a so-called "mid-hanging" state, so as mentioned above, the hot metal with high specific gravity and high speed is constantly flowing. The lance vibrates violently, and the vibration becomes even more intense when combined with the shock caused by the blowing of the desiliconizing agent and carrier gas.

この為ランス２先端の耐火物にはクラックが生じ易く、
一旦クラックが発生すると前述の如く該クラックへの湯
の差し込み→侵食→崩壊が急速に進行し、短時間で使用
不能の状態に至る。これに対し本発明では、第１図（Ａ
）、（Ｂ）に表われる如くランス２の下面が溶銑樋ｌの
底面に当接して押付は固定されており、上方は勿論支持
装置によって支持されているので、前記「中ぶらり」の
状態が解消され、溶銑流の衝突やキャリヤガスの吹込み
ショック等を受けてもランス２は振動を起こさず、従っ
て先端耐火物に見られるクラックの発生は激減する。そ
の結果従来例の様な加速度的侵食φ崩壊の進行が回避さ
れ、ランス２の寿命を大幅に延長することができる。For this reason, cracks are likely to occur in the refractory material at the tip of lance 2.
Once a crack occurs, as described above, the process of pouring hot water into the crack, erosion, and collapse progresses rapidly, and the product becomes unusable in a short period of time. On the other hand, in the present invention, as shown in FIG.
), (B), the lower surface of the lance 2 is in contact with the bottom surface of the hot metal trough 1, and the pressing is fixed, and the upper part is of course supported by the support device, so that the above-mentioned "mid-hanging" state is prevented. As a result, the lance 2 does not vibrate even when subjected to the collision of hot metal flow or the shock of blowing carrier gas, and therefore the occurrence of cracks seen in tip refractories is drastically reduced. As a result, the progression of accelerated erosion φ collapse as in the conventional example is avoided, and the life of the lance 2 can be significantly extended.

加えて本発明の方法を採用すれば脱珪効率自体も相出向
上することが確認されており、その理由は次の様に考え
ることができる。即ち従来例では、処理を受けるべき溶
銑Ｍはランス２の両横側及び下部の隙間を通して流れ、
主にランス２の下流側で該ランス２から吹込まれた脱珪
剤と接触して脱珪処理を受ける訳であるが、一部の溶銑
が脱珪剤と反応しないで流れ出るのを避けることは非常
にむつかしい、ところが本発明であれば、溶銑Ｍは全て
がランス２の両側部を通って流下することになり、この
部分に対して脱珪剤Ｆが十分に供給されることになる為
未処理溶銑の通過量が減少し、結局脱珪効率も向上する
ものと考えられる。In addition, it has been confirmed that if the method of the present invention is employed, the desiliconization efficiency itself is improved, and the reason for this can be considered as follows. That is, in the conventional example, the hot metal M to be treated flows through the gaps on both sides and the bottom of the lance 2,
Mainly on the downstream side of the lance 2, it comes into contact with the desiliconizing agent injected from the lance 2 and undergoes desiliconization treatment, but it is possible to prevent some of the hot metal from flowing out without reacting with the desiliconizing agent. However, with the present invention, all of the hot metal M will flow down through both sides of the lance 2, and the desiliconizing agent F will be sufficiently supplied to this part, so it will not be It is thought that the passing amount of treated hot metal decreases and the desiliconization efficiency improves as a result.

ちなみに単孔式ランスを用いた従来のインジェクション
方式による脱珪法と、横吹４孔式ランスを溶銑樋の底面
に押付は固定して行なった本発明脱珪法との比較実験を
行なったところ、第１表に示す結果が得られた。By the way, we conducted a comparative experiment between the conventional injection method desiliconization method using a single-hole lance and the desiliconization method of the present invention, which was carried out by pressing and fixing a side-blowing four-hole lance to the bottom of the hot metal trough. The results shown in Table 1 were obtained.

第　　１　　表 但し樋底侵食量、ランス寿命及び脱珪効率は次の様にし
て求めた。Table 1 However, the amount of gutter bottom erosion, lance life, and desiliconization efficiency were determined as follows.

脱珪酸素効率： 上記の結果からも明らかな様に本発明の方法を採用すれ
ば、溶銑樋底面の侵食を大幅に減少し得るばかりでなく
ランスの寿命を大幅に延長することができ、更には脱珪
効率も相当品めることができる。Desiliconization and oxygen efficiency: As is clear from the above results, by adopting the method of the present invention, it is possible not only to significantly reduce the erosion of the bottom of the hot metal trough, but also to greatly extend the life of the lance. The desiliconization efficiency can also be considerably improved.

尚上記では溶銑樋脱珪をとりあげて説明したが、上記の
様な本発明独自の特徴は溶銑や溶鋼を積上で脱燐或は脱
硫処理する様な場合にも同様に発揮し得るもので、溶鉄
の連続精錬法として幅広く適用することができる。Although the description above has focused on desiliconization of hot metal troughs, the unique features of the present invention as described above can be similarly exhibited in cases where hot metal or molten steel is dephosphorized or desulfurized in piles. , it can be widely applied as a continuous refining method for molten iron.

またランス先端部に形成するノズルは、横向きに指向さ
れたものである限りその数や寸法には一切制限されず、
図示した様な４孔式の他、３孔又は２孔式或は単孔式で
あってもよく、更には５孔以上の多孔式であっても勿論
かまわないが、ランス先端部の強度を確保する意味から
すれば４孔弐以下のものが好ましく、５孔以上とする場
合は例えば第３図に示す如く高さ方向に位置を変えて形
成するのがよい、更にこれらノズルの向きも一切制限さ
れず１例えば第４図（Ａ）、（Ｂ）に示す如く溶銑樋１
（７）壁面と直交又は平行に指向させる方法、第５図に
示す如く同壁面に対し斜交する方向に指向させる方法、
或は第６図に示す如くこれらを組合わせた方法等を採用
することができる。In addition, there are no restrictions on the number or size of the nozzles formed at the tip of the lance, as long as they are oriented horizontally.
In addition to the four-hole type shown in the figure, it may be a three-hole type, a two-hole type, a single-hole type, or even a multi-hole type with five or more holes, but the strength of the tip of the lance must be From the point of view of securing nozzles, it is preferable to have no more than 4 holes, and if there are more than 5 holes, it is better to change the position in the height direction as shown in Fig. For example, as shown in FIGS. 4(A) and (B), hot metal sluice 1
(7) A method of directing it perpendicularly or parallel to the wall surface, a method of directing it in a direction oblique to the wall surface as shown in FIG.
Alternatively, a method combining these methods as shown in FIG. 6 can be adopted.

また多少上方又は下方へ向けて形成しても良く、更に従
来のインジェクシゴン法において時たま見られた溶銑の
飛散を防止する為、例えば第７図に示す如くランス侵漬
位置における溶銑樋１上方部を幅広く形成することも有
効である。It may also be formed somewhat upwardly or downwardly, and in order to prevent hot metal from scattering, which is sometimes seen in the conventional injection method, for example, as shown in FIG. It is also effective to form a wide section.

、［発明の効果］ 本発明は以上の様に構成されており、溶鉄橋底面の局部
侵食を防止してその寿命を大幅に延長し得るばかりでな
く、ランス先端部の寝食・崩壊も著しく抑制することが
でき、こうした設備面の利益に加えて脱珪効率等の精錬
効率をも高めることができ、ひいては精錬剤に消費量も
低減することが可能となる。[Effects of the Invention] The present invention is configured as described above, and it not only prevents local erosion of the bottom of the molten iron bridge and significantly extends its life, but also significantly suppresses erosion and collapse of the tip of the lance. In addition to these benefits in terms of equipment, it is also possible to increase refining efficiency such as desiliconization efficiency, and in turn, it is possible to reduce the consumption of refining agents.

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

ｉ１図は本発明の実施例を示す説明図、第２図は従来例
を示す説明図、第３図はランスの他の例を示す一部見取
り図、第４〜６図はランスに開口されるノズルの種々の
例を示す説明図、第７図は溶鉄樋の好ましい例を示す平
面図である。 １・・・溶鉄（銑）樋　　　２・・・ランス２ａ・・・
ノズルFigure i1 is an explanatory diagram showing an embodiment of the present invention, Figure 2 is an explanatory diagram showing a conventional example, Figure 3 is a partial sketch showing another example of the lance, and Figures 4 to 6 are openings in the lance. Explanatory views showing various examples of nozzles, and FIG. 7 is a plan view showing a preferred example of a molten iron gutter. 1... Molten iron (pig) gutter 2... Lance 2a...
nozzle

Claims (1)

【特許請求の範囲】[Claims] 先端付近から横向きに噴出ノズルを開口した精錬剤吹込
みランスの最先端面を溶鉄樋の下面に当接し、該溶鉄樋
中を流れる溶鉄にキャリヤガスと共に精錬剤を吹込むこ
とを特徴とする溶鉄樋精錬方法。A molten iron characterized in that the most advanced surface of a refining agent injection lance, which has a sideways spouting nozzle opened from near the tip, is brought into contact with the lower surface of a molten iron gutter, and the refining agent is injected together with a carrier gas into the molten iron flowing in the molten iron gutter. Gutter smelting method.