JPH0421816Y2 - - Google Patents
Info
- Publication number
- JPH0421816Y2 JPH0421816Y2 JP1985100730U JP10073085U JPH0421816Y2 JP H0421816 Y2 JPH0421816 Y2 JP H0421816Y2 JP 1985100730 U JP1985100730 U JP 1985100730U JP 10073085 U JP10073085 U JP 10073085U JP H0421816 Y2 JPH0421816 Y2 JP H0421816Y2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- lance
- slag
- refining
- gutter
- 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.)
- Expired
Links
- 238000007670 refining Methods 0.000 claims description 64
- 239000002893 slag Substances 0.000 claims description 60
- 239000003795 chemical substances by application Substances 0.000 claims description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 230000014759 maintenance of location Effects 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000007654 immersion Methods 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 description 109
- 229910052751 metal Inorganic materials 0.000 description 109
- 238000000034 method Methods 0.000 description 26
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 14
- 239000011819 refractory material Substances 0.000 description 14
- 230000003628 erosive effect Effects 0.000 description 13
- 230000005587 bubbling Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 239000007789 gas Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000011282 treatment Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 241000238634 Libellulidae Species 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は溶鉄の連続精錬装置に関し、殊に溶鉄
樋を通過中の溶鉄に精錬剤（脱珪剤、脱燐剤、脱
硫剤等）を吹込んで連続的に精錬を行なうに当た
り、溶鉄の飛散ロスを低減し得るばかりでなく精
錬剤の有効利用と精錬効率の向上を図り、更には
精錬剤吹込みランス及び溶鉄樋の侵食を抑制して
寿命を延長することのできる連続精錬装置に関す
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場合に
適用される装置を主体にして説明を進めるが、本
考案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
の各種の処理を行なう場合にも同様に適用するこ
とができる。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuous molten iron refining device, and in particular, it applies a refining agent (desiliconizing agent, dephosphorizing agent, desulfurizing agent, etc.) to the molten iron passing through a molten iron gutter. When continuously refining by injection, it not only reduces the scattering loss of molten iron, but also makes effective use of the refining agent and improves refining efficiency, and also suppresses erosion of the refining agent injection lance and molten iron gutter. This invention relates to a continuous refining device that can extend its life. In this specification, the description will mainly be given to an apparatus applied when hot metal tapped from a blast furnace is subjected to continuous desiliconization treatment on a cast bed, but the present invention is of course not limited to this. The present invention can be similarly applied to various treatments such as continuous dephosphorization or desulfurization of hot metal or molten steel as it passes through the gutter.
［従来の技術］
取鍋脱珪法に代わる比較的新しい炉外脱珪法と
して、高炉鋳床の出銑樋を流れる溶銑に脱珪剤を
投入し、取鍋へ受け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
の流れによつ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、
及び
上記の方法では攪拌・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エク
シヨンランスを突込み、該ランスからキヤリヤ
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、
更には
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、溶銑樋を流れる溶銑
の上方部からキ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つて生じる
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
い方法として賞用されている。殊に上記の方法
では、ランスからのガス吹込みに伴うバブリング
と溶銑の乱流による攪拌が重なつて発揮され攪拌
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 outside-furnace desiliconization method that replaces the ladle desiliconization method, a desiliconization agent is introduced into the hot metal flowing through the tap pipe of a blast furnace casthouse, and the desiliconization treatment is performed before it is received in the ladle. The hot metal sluice desiliconization method that can be completed is becoming popular. That is, this method includes a method in which a desiliconizing agent is introduced into hot metal flowing through a hot metal trough, and the desiliconizing agent is drawn into the hot metal using the stirring effect produced by the flow of hot metal to perform desiliconization, and the above-mentioned method. Considering that the stirring and entrainment effects are weak in the method described above, 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 induce a reaction between the hot metal and the desiliconizing agent. In addition, since the above method has the problems described below, in order to prevent lance erosion, a granular desiliconizing agent is sprayed together with a carrier gas from above the hot metal flowing in the hot metal gutter, and the hot metal flow is A method of increasing the contact efficiency between the desiliconizing agent and the hot metal by using the stirring force generated by the spraying and improving the desiliconization efficiency is known. This method has been praised as an extremely efficient method. In particular, in the above method, it is thought that a high level of desiliconization efficiency is achieved because the bubbling caused by gas injection from the lance and the stirring caused by the turbulent flow of the hot metal combine to increase the stirring efficiency. There is.
尚上記の示した様な方法を実施する際に用い
る設備は、例えば第３図（概略縦断面図）及び第
４図（概略横断面図）に示す通りであり、新たに
準備するものは脱珪剤吹込みランス２だけであつ
て、通常の溶銑樋１の適所に該ランス２を浸漬し
このランス２から脱珪剤ＦをキヤリヤガスＧと共
に溶銑Ｍ中へ吹込むことによつて脱珪処理が行な
われる。 The equipment used to carry out the method shown above is as shown in Figure 3 (schematic longitudinal cross-sectional view) and Figure 4 (schematic cross-sectional view), and the equipment to be newly prepared is omitted. Desiliconization treatment is carried out using only the silica injection lance 2, by immersing the lance 2 in a suitable position in a normal hot metal trough 1 and injecting the desiliconizing agent F into the hot metal M together with the carrier gas G from the lance 2. will be carried out.
［考案が解決しようとする課題］
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、こうした問題は樋上で脱燐、脱硫等の
色々の精錬処理を行なう場合についても共通する
欠点と言える。[Problems to be solved by the invention] However, the above method is not completely free of problems, and there are still various problems that need to be improved, such as those listed below. This can be said to be a common drawback when performing various refining treatments.
(a) 吹込みガスのバブリングによつて溶銑が樋外
に飛散する為非常に危険であり、且つ溶銑ロス
にもつながつてくる。(a) Bubbling of the blown gas causes hot metal to scatter outside the gutter, which is extremely dangerous and also leads to loss of hot metal.
(b) 溶銑樋や吹込みランスを構成する耐火物がス
ラグライン付近で著しく侵食を受ける。(b) The refractories that make up the hot metal trough and injection lance are severely eroded near the slag line.
(c) 脱珪剤は溶銑に比べて比重が小さく、吹込み
後はすみやかに溶銑表面へ浮上する為、相当量
の脱珪剤が未反応のままで排出される。(c) The desiliconizing agent has a lower specific gravity than the hot metal and quickly floats to the surface of the hot metal after being blown, so a considerable amount of the desiliconizing agent is discharged unreacted.
(d) 脱珪剤はランス最先端部に開口したノズルか
らキヤリヤノズルと共に下向きに吹込まれる
が、この吹込み流によつ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更に
短縮される。(d) The desiliconizing agent is blown downward along with the carrier nozzle from the nozzle opened at the leading edge of the lance, but this blowing flow locally erodes the lower surface of the hot metal gutter, which reduces the lifespan of the hot metal gutter. is further shortened.
しかもランスは、湯面の上方から片持ち状態で
垂下されて先端が溶銑内へ浸漬されているのが通
例であり、高質量溶銑の急速な流れ（比重：約
6.7、流速：約80cm／sec）を受けて著しく振動す
る他、脱珪剤の吹込み時にうける衝撃的反作用を
受ける為ランス自体に微細なクラツクが発生し易
い。この様なクラツクが発生すると、このクラツ
ク内に溶銑又はスラグが浸入して侵食が著しく促
進される為、ランス先端が単時間のうちに破壊し
てしまう。 Moreover, the lance is usually suspended in a cantilevered manner from above the hot metal surface, with the tip immersed into the hot metal, and the rapid flow of high-mass hot metal (specific gravity: approx.
6.7, flow velocity: approximately 80 cm/sec), causing significant vibration, and the lance itself is susceptible to minute cracks due to the impact reaction that occurs when the desiliconizing agent is blown into the lance. When such cracks occur, hot metal or slag infiltrates into the cracks, significantly accelerating erosion, and causing the lance tip to break within a short period of time.
この様な背景の下で前記の方法が開発されて
きたが、の方法では溶銑及び脱珪剤の飛散が激
しく、飛散防止の観点から吹付け速度を低下させ
る等の対策が必要であり、実用性が少ない。そこ
で再び前記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つて
は、前記(a)〜(d)に示した様な問題点を解消乃至軽
減することが重大な課題となつており、これらは
樋上で脱燐、脱硫等の各種精錬処理を行なう場合
を含めた共通の課題といえる。本考案はこうした
状況のもとで、上記の様な課題を一挙に解消する
ことのできる様な連続精錬装置を提供しようとす
るものである。 The above-mentioned method has been developed against this background, but in the method described above, hot metal and desiliconizing agent scatter violently, and countermeasures such as reducing the spraying speed are required to prevent scattering, making it impractical. Less sexual. Therefore, we are forced to return to the above method again, and when implementing the method, it is important to eliminate or alleviate the problems shown in (a) to (d) above. This can be said to be a common problem in cases where various refining processes such as dephosphorization and desulfurization are performed on the gutter. Under these circumstances, the present invention aims to provide a continuous refining device that can solve the above-mentioned problems all at once.
［課題を解決する為の手段］
上記の目的を達成し得た本考案の連続精錬装置
とは、溶銑樋中を流れる溶銑内へ先端を精錬剤吹
込みランスを浸漬配置してなる溶銑の連続精錬装
置において、上記溶銑樋は、上記ランス浸漬位置
に至つてその上方を樋底部側より幅広く形成して
スラグ滞留部を構成すると共に、精錬剤吹込みラ
ンスはその先端付近から横向きに噴出ノズルを開
口し、該ランス先端を溶銑樋の下面に当接したも
のであるところに要旨を有するものである。[Means for Solving the Problems] The continuous refining device of the present invention that has achieved the above objectives is a continuous refining device of the present invention in which a lance whose tip is immersed with a refining agent injected into the hot metal flowing in the hot metal gutter is disposed. In the refining equipment, the hot metal gutter reaches the lance immersion position and has its upper part wider than the bottom side of the gutter to form a slag retention area, and the refining agent injection lance has a sideways jetting nozzle from near its tip. The gist is that the lance is open and the tip of the lance is brought into contact with the lower surface of the hot metal trough.
［作用］
本考案では前述の様な問題点を解消乃至抑制す
る為、吹込みランス浸漬位置との関係を考慮しつ
つ溶銑樋の構成を工夫すると共に、該ランスの構
造および配設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まず本考案では、溶銑
樋を、精錬剤吹込みランスの浸漬位置付近に至つ
てその上方を樋底部より幅広く形成してスラグ滞
留部として構成してなるものであり、この様な構
成とすることによつて次の様な作用が発揮され
る。[Function] In order to eliminate or suppress the above-mentioned problems, the present invention devises the configuration of the hot metal trough while taking into consideration the relationship with the immersion position of the blowing lance, and also devises the structure and arrangement method of the lance. Adding. That is, as will be made clear in the examples below, in the present invention, the hot metal gutter is formed near the immersion position of the refining agent injection lance and the upper part thereof is wider than the bottom of the gutter to form a slag retention section. With this configuration, the following effects are achieved.
(イ) 溶銑樋におけるランス浸漬位置（ガス吹込み
位置、即ちガスバブリング位置）の上方部周辺
を広幅に形成しているので溶銑が樋外へ飛散し
にくく安全性が向上すると共に、溶銑の飛散ロ
スや環境汚染の問題も抑制される。(b) The area around the upper part of the lance immersion position (gas injection position, i.e., gas bubbling position) in the hot metal gutter is made wide, which prevents hot metal from scattering outside the gutter and improves safety. Problems of loss and environmental pollution will also be suppressed.
(ロ) 溶銑樋やランスのスラグライン付近で生じる
侵食は、これらの中の耐火材成分が精錬工程で
副生する酸化鉄（FeO）等と反応して溶出する
為に起こるものと考えられており、特にスラグ
流速が早く且つバブリングにより激しく攪拌さ
れている部分では摩擦力の増大とも相まつて侵
食が急速に進行する。ところが本考案では、前
述の如く溶銑樋のランス浸漬位置の上方周辺部
を広幅にしてスラグ滞留部を形成しており、精
錬処理により生成したスラグの流速はこの部分
で非常にゆるやかとなる。その結果スラグの流
れによつて生じる摩擦力が低減し、溶銑樋やラ
ンスの侵食が著しく抑制されることになる。し
かも該スラグ滞留部においてスラグの流速が遅
くなつた分だけ溶銑と精錬剤の接触時間が延長
されることになり、精錬効率が向上すると共に
精錬剤ロスも低減することができる。(b) Erosion that occurs near the slag lines of hot metal sluices and lances is thought to occur because the refractory components in these react with iron oxide (FeO), etc., which are by-products of the smelting process, and are leached out. Particularly in areas where the slag flow rate is high and is vigorously agitated by bubbling, erosion progresses rapidly as frictional force increases. However, in the present invention, as described above, the area above the lance immersion position of the hot metal trough is widened to form a slag retention area, and the flow velocity of the slag produced by the refining process becomes very slow in this area. As a result, the frictional force caused by the flow of slag is reduced, and erosion of the hot metal sluices and lances is significantly suppressed. Moreover, the contact time between the hot metal and the refining agent is extended by the amount that the flow rate of the slag is reduced in the slag retention section, so that the refining efficiency can be improved and the loss of the refining agent can be reduced.
また本発明では、精錬剤吹込みランスに設けら
れる噴出ノズルをランス先端付近から横向きに開
口すると共に、該ランス先端を溶銑樋の下面に当
接させる構成とすることにより、次の様な作用が
発揮させる。 Furthermore, in the present invention, the jet nozzle provided on the refining agent injection lance is opened sideways from near the tip of the lance, and the tip of the lance is configured to abut against the lower surface of the hot metal gutter, thereby achieving the following effects. Make it work.
(ハ) 精錬剤は横向きに形成された噴射ノズルから
吹込まれるので、溶銑樋におけるランス配設位
置下面の耐火物が局部的に侵食を受けることが
なく、溶銑樋の寿命が延長される。(c) Since the refining agent is injected from the horizontally formed injection nozzle, the refractory material on the lower surface of the lance installation position in the hot metal trough is not locally eroded, and the life of the hot metal trough is extended.
(ニ) しかもランスの先端は溶銑樋の下面に当接さ
れ、上・下から両持ち状態で安定に支持されて
いるので、溶銑流の衝突による振動や精錬剤の
吹込みによる衝撃的反作用による振動も少な
く、該振動によるクラツクの発生も抑えられる
結果、ランス自体の寿命も延長される。(d) In addition, the tip of the lance is in contact with the lower surface of the hot metal trough and is stably supported from above and below, so that vibrations caused by the collision of the hot metal flow and impact reactions caused by the injection of refining agents are prevented. There is less vibration, and the occurrence of cracks due to the vibration is suppressed, resulting in an extension of the life of the lance itself.
本考案の連続精錬装置は、前述の如く任意位置
の上方部に広幅のスラグ滞留部を形成した樋と、
当該位置における溶銑流路に先端を当接して浸漬
される吹込みランスを必須の構成要件とするもの
で、精錬剤を選定することによつて脱珪、脱燐或
は脱硫等を行なうことができる。またこれらの精
錬剤は吹込みランスからアルゴン、窒素等のガス
流に乗せて溶銑中へ吹込めばよい。 The continuous smelting device of the present invention includes a gutter having a wide slag retention section formed in the upper part of an arbitrary position as described above;
The essential component is a blowing lance whose tip is immersed in contact with the hot metal flow path at the relevant location, and by selecting a refining agent, it is possible to perform desiliconization, dephosphorization, or desulfurization. can. Further, these refining agents may be blown into the hot metal from a blowing lance along with a gas flow such as argon or nitrogen.
［実施例］
以下実施例を示す図面を参照しながら本考案の
構成及び作用効果を一層明確にする。[Examples] The configuration and effects of the present invention will be further clarified with reference to the drawings showing examples below.
第１、２図は本考案の実施例を示すもので、第
１図は概略平面図、第２図は第１図における−
線断面相当図を示し、図中１は溶銑樋、２はラ
ンス、２ａは噴出ノズル、３，４はスキンマ、５
は排滓口、Ｍは溶銑、Ｓは精錬スラグ、Ｆは精錬
剤、Ｇはガスを夫々示し、矢印は溶銑の流れを表
わしている。そして第１図の左側から送られてく
る溶銑Ｍは、スキンマ３の部分で溶銑滓等が除去
された後右方向に流れ、ランス配置位置で精錬処
理を受けた後、生成した精錬スラグＳは右端部の
排滓口５から排出されると共に、精錬を終えた溶
銑Ｍはスキンマ４の下をくぐつて下流方向へ流れ
て行く。 Figures 1 and 2 show an embodiment of the present invention, where Figure 1 is a schematic plan view and Figure 2 is a -
A diagram corresponding to a line cross section is shown, in which 1 is a hot metal trough, 2 is a lance, 2a is a jet nozzle, 3 and 4 are skimmers, and 5
indicates the slag outlet, M indicates the hot metal, S indicates the smelting slag, F indicates the refining agent, and G indicates the gas, and the arrows indicate the flow of the hot metal. The hot metal M sent from the left side of Fig. 1 flows to the right after the hot metal slag etc. are removed at the skimmer 3, and after being subjected to the refining process at the lance placement position, the generated refining slag S is While being discharged from the slag discharge port 5 at the right end, the refined hot metal M passes under the skimmer 4 and flows downstream.
これらの図からも明らかな様に本考案では、溶
銑樋１の任意の場所に上方を広幅に形成したスラ
グ滞留部１ｂを形成すると共に、該スラグ滞留部
１ｂの略中心部に位置する溶銑流路１ａにランス
２の先端を流路の下面に当接して浸漬配置されて
おり、該ランス２の先端近傍に横向きに開口した
噴射ノズル２ａからアルゴン等のガスと共に精錬
剤を吹込んで精錬が行なわれる。この場合通常の
溶銑樋を使用すると、前述の如く或は第３図（概
略縦断面図）および第４図（第３図の−線断
面相当図）に略示する如く、バブリングによつて
湯面上に生ずる湯末（溶銑及び精錬剤を含む）が
溶銑樋１の両側へ飛散し、作業員に危害を及ぼす
恐れがあるばかりでなく環境を著しく汚染し、更
には溶銑や精錬剤のロスを招く。しかるに本考案
であれば、第１、２図に示す如くランス浸漬位
置、即ちバブリング位置の上方部周辺に広幅のス
ラグ滞留部１ｂを形成しているので、飛散した湯
末の殆んどは該スラグ滞留部１ｂに落ちて捕集さ
れ、作業員に危害を与えたり溶銑ロス等を招く恐
れはなくなる。尚第２図に鎖線で示した様に溶銑
樋１のバブリング部周辺をおおうカバー６を取付
けておけば、飛散によつて生じる問題を一層確実
に阻止することができる。 As is clear from these figures, in the present invention, a slag retention section 1b with a wide upper part is formed at an arbitrary location in the hot metal gutter 1, and a hot metal flow located approximately in the center of the slag retention section 1b is formed. A lance 2 is immersed in the channel 1a with the tip of the lance 2 in contact with the lower surface of the channel, and refining is performed by blowing a refining agent together with gas such as argon from an injection nozzle 2a that opens horizontally near the tip of the lance 2. It can be done. In this case, if a normal hot metal sluice is used, the hot metal will flow through bubbling as described above or as shown schematically in Figure 3 (schematic vertical cross-sectional view) and Figure 4 (corresponding to the cross-sectional view taken along the line - in Figure 3). The hot metal dust (including hot metal and refining agent) generated on the surface may scatter to both sides of the hot metal sluice 1, which not only poses a risk of harm to workers, but also significantly pollutes the environment, and furthermore causes loss of hot metal and refining agent. invite. However, with the present invention, as shown in Figures 1 and 2, a wide slag retention area 1b is formed around the upper part of the lance immersion position, that is, the bubbling position, so most of the scattered molten metal is There is no fear that the slag will fall into the slag retention section 1b and be collected, causing harm to workers or causing hot metal loss. Incidentally, if a cover 6 is attached to cover the bubbling portion of the hot metal trough 1 as shown by the chain line in FIG. 2, problems caused by scattering can be more reliably prevented.
更に本考案の装置を使用すれば、上記の様な効
果に加えて、溶銑樋１及びランス２のスラグライ
ン付近で進行する耐火物の侵食を抑制し得る他、
精錬効率を高めるという効果も得られる。即ち先
に説明した様にガス吹込み式精錬法を採用した溶
銑樋精錬に当たつては、溶銑樋１及びランス２の
スラグライン付近における耐火物が激しく侵食さ
れることが確認されており、［例えば第４図にお
ける斜線イ，ロで示す部分］、該侵食の主な原因
としては、(a)精錬時の激しい攪拌によつてスラグ
ライン付近に生成する酸化鉄が溶銑樋やランスの
耐火性成分と反応してこれを溶出させる、(b)スラ
グＳは比較的融点が高く且つ高粘性であり、これ
が強力なバブリングを受けつつ高速で流れる為そ
の摩擦力によつて耐火物が摩耗する、ということ
が考えられ、これらが相加的乃至相乗的に作用し
てスラグライン付近の耐火物が急速に侵食を受け
るものと思われるが、本考案では溶銑樋１を図示
した様な構造とすることによつて、樋及びランス
の侵食を著しく抑制することができる。この点を
更に詳細に説明すると、本考案では精錬剤吹込み
位置近傍の上方部に広幅のスラグ滞留部１ｂが形
成されており、溶銑Ｍ中を浮上しながら精錬に寄
与した後の生成スラグＳは比重差で湯面上へ浮上
してくるが、該流路は図示する様に幅広いスラグ
滞留部として形成されているので、当該部分にお
けるスラグＳの流れは溶銑流路１ａを流れる溶銑
に比べて非常に遅くなる。その為前述の如きスラ
グの流れによつて生じる摩擦力が激減し、スラグ
ライン付近に見られる物理的な侵食は大幅に抑制
される。また耐火物侵食の他の主原因である酸化
鉄との反応については、上記の様にバブリング位
置に形成されたスラグ滞留部１ｂが拡大されてい
る為、生成する酸化鉄等が該スラグ滞留部１ｂ全
体に分散され、結局耐火物の侵食を進める酸化鉄
等の単位面積当たりの濃度が非常に低いものとな
り、化学的な侵食も著しく抑制される。そしてこ
れら物理的及び化学的侵食の抑制効果が相乗的に
発揮される結果、スラグライン付近における耐火
物の侵食を最小限に抑えることができる。尚広幅
のスラグ滞留部１ｂをゆつくり流下したスラグＳ
は、第１図の右側に移動した後通常の幅の溶銑樋
１に沿つて高速で流下していくが、この時点では
脱珪反応の進行によつてスラグＳ中の酸化鉄濃度
が低下しているので、耐火物の侵食はそれほど進
行しない。しかし第５図（平面図）に示す如く、
広幅のスラグ滞留部１ｂを下流方向にむかつて長
尺に形成しておけば、スラグ流速の遅延効果が一
層有効に発揮される結果、バブリング位置よりも
下流側における侵食も効果的に抑制することがで
きる。 Furthermore, by using the device of the present invention, in addition to the above-mentioned effects, it is possible to suppress the corrosion of refractories progressing near the slag line of the hot metal trough 1 and lance 2, and to
It also has the effect of increasing refining efficiency. That is, as explained earlier, it has been confirmed that in hot metal sluice refining using the gas injection refining method, the refractories near the slag lines of the hot metal sluice 1 and lance 2 are severely eroded. [For example, the areas indicated by diagonal lines A and B in Fig. 4] The main causes of this corrosion are (a) iron oxide generated near the slag line due to intense stirring during smelting, which causes refractory damage to hot metal gutters and lances; (b) Slag S has a relatively high melting point and high viscosity, and as it flows at high speed while undergoing strong bubbling, the refractory is worn out by the frictional force. It is thought that these factors act additively or synergistically and the refractories near the slag line are rapidly eroded. However, in the present invention, the structure of the hot metal trough 1 as shown in the figure is By doing so, erosion of gutters and lances can be significantly suppressed. To explain this point in more detail, in the present invention, a wide slag retention part 1b is formed in the upper part near the refining agent injection position, and the generated slag S after contributing to refining while floating in the hot metal M. Slag rises to the surface of the hot metal due to the difference in specific gravity, but since the flow path is formed as a wide slag retention area as shown in the figure, the flow of slag S in this area is slower than that of the hot metal flowing through the hot metal flow path 1a. It becomes very slow. Therefore, the frictional force generated by the slag flow as described above is drastically reduced, and the physical erosion seen near the slag line is greatly suppressed. Regarding the reaction with iron oxide, which is another main cause of refractory corrosion, since the slag retention area 1b formed at the bubbling position is expanded as described above, the generated iron oxide, etc. The concentration per unit area of iron oxide, etc., which is dispersed throughout the refractory and eventually advances the erosion of the refractory, becomes extremely low, and chemical erosion is also significantly suppressed. As a result of these physical and chemical corrosion suppressing effects being exerted synergistically, corrosion of the refractory near the slag line can be minimized. The slag S slowly flowed down the wide slag retention part 1b.
After moving to the right side of Fig. 1, the slag S flows down at high speed along the hot metal sluice 1 of normal width, but at this point, the iron oxide concentration in the slag S decreases due to the progress of the desiliconization reaction. Therefore, corrosion of refractories does not progress much. However, as shown in Figure 5 (plan view),
If the wide slag retention part 1b is formed to be long in the downstream direction, the effect of retarding the slag flow velocity will be more effectively exerted, and as a result, erosion on the downstream side of the bubbling position can be effectively suppressed. I can do it.
尚バブリングにより飛散した溶銑Ｍは一旦スラ
グ滞留部１ｂ上へ落下した後、有価精錬剤を含む
スラグＳ層を通して精錬処理を受けた後下方の溶
銑流路１ａ内の溶銑Ｍと合流し、またバブリング
が最も強力に行なわれる部位でスラグＳの流速が
遅くなる構成となつており、当該部位においてス
ラグＳ中の有価精錬剤成分は溶銑Ｍと効率良く接
触する為、精錬効率自体が向上するばかりでなく
有価精錬剤の排出ロスも減少し、同一精錬効率を
確保する為の精錬剤原単位の低減を図ることも可
能となる。 Incidentally, the hot metal M scattered by bubbling once falls onto the slag retention section 1b, undergoes a refining treatment through the slag S layer containing a valuable refining agent, and then merges with the hot metal M in the hot metal flow path 1a below. The structure is such that the flow velocity of the slag S is slowed down at the part where the most powerful refining is carried out, and the valuable refining agent components in the slag S come into contact with the hot metal M efficiently in that part, so that the refining efficiency itself is improved. This also reduces waste loss of valuable refining agents, making it possible to reduce the unit consumption of refining agents to ensure the same refining efficiency.
ところで溶銑樋におけるランス浸漬位置の溶銑
流路（スラグラインよりも下方部）を含めて全体
を広幅にすることも可能であるが、この様な構成
の溶銑樋では、スラグや溶銑の飛散防止は図れる
ものの、本考案で得られる様な精錬効率向上効果
を得ることはできない。即ちランス浸漬位置の全
体を広幅にしたものでは、該広幅部において溶銑
の流速も遅くなるため精錬反応率は若干向上する
が、該流速遅延部では溶銑量自体も多くなるため
精錬剤との接触効率が悪くなり、全体としての精
錬効率はかえつて低くなることもある。これに対
し本考案では、前述の如くランス浸漬位置におけ
るスラグラインを含めた上方側のみを広幅に形成
しており、下方部の溶銑流路は幅広くしていない
ので、この流路を流れる溶銑は、ランスから吹込
まれる精錬剤と効率良く接触する。しかも精錬剤
の吹込みに伴なうバブリング作用により精錬剤と
共に上方へ吹き上げられた溶銑はスラグ滞留部に
滞留するスラグ中に含まれる有価精錬剤と更に接
触して精錬を受けるので、精錬効率は著しく高め
られる。ちなみに後期第７図は、第２図に示した
様にランス浸漬部におけるスラグライン付近の上
方側のみを広幅にしてスラグ滞留部を形成した溶
銑樋を用いた場合（実施例）と、ランス浸漬部の
溶銑流路を含めて全体を広幅にして溶銑とスラグ
の滞留部を形成した場合（比較例）について、ラ
ンスより溶銑１トン当たり20Kgの脱珪剤を吹込ん
だときの経過時間と脱珪効率の関係を対比して示
したグラフである。このグラフからも明らかであ
る様に、本考案によれば、溶銑樋のランス浸漬位
置全体を広幅にした比較例に比べて脱珪効率を大
幅に高め得ることが分かる。 By the way, it is possible to widen the entire hot metal channel including the hot metal channel at the lance immersion position (below the slag line) in the hot metal channel, but in a hot metal channel with such a configuration, it is difficult to prevent slag and hot metal from scattering. However, it is not possible to obtain the effect of improving refining efficiency as obtained by the present invention. In other words, when the entire lance immersion position is widened, the flow rate of hot metal slows down in the wide part, so the refining reaction rate improves a little, but the amount of hot metal itself increases in the slow flow part, so it is difficult to contact with the refining agent. The efficiency may deteriorate, and the overall refining efficiency may even become lower. On the other hand, in the present invention, as mentioned above, only the upper side including the slag line at the lance immersion position is widened, and the lower part of the hot metal flow path is not wide, so the hot metal flowing through this flow path is , makes efficient contact with the refining agent injected from the lance. Moreover, the hot metal that is blown upward together with the refining agent due to the bubbling effect that accompanies the injection of the refining agent further contacts the valuable refining agent contained in the slag retained in the slag retention area and undergoes refining, so the refining efficiency increases. significantly enhanced. By the way, the latter half of Fig. 7 shows the case (example) using a hot metal gutter in which only the upper side near the slag line in the lance immersion part is widened to form a slag retention part as shown in Fig. 2, and the lance immersion In the case (comparative example) in which the entire area including the hot metal flow path is widened to form a retention area for hot metal and slag, the elapsed time and desilicating agent are injected from a lance at a rate of 20 kg per ton of hot metal. It is a graph showing a comparison of the relationship between silicon efficiency. As is clear from this graph, it can be seen that according to the present invention, the desiliconization efficiency can be greatly improved compared to the comparative example in which the entire lance immersion position of the hot metal gutter is widened.
本考案は概略以上の様に構成されるが、要する
に溶銑樋の上方部適所に形成された広幅のスラグ
滞留部と、当該位置における溶銑流路に先端部を
当接して浸漬されるランスを備えてなるところに
その要旨が存在するものであつて、かかる構成を
具備する限り溶銑樋１の具体的な形状或はランス
の構造や設置法等は適当に変更することができ
る。例えば溶銑樋に形成されるスラグ流路の形状
は第１、５図の例の他、矩形或は多角形等を採用
することができる。またランス２としては横向き
に４個のノズル２ａを設けたものを示したが、孔
数は一切制限されない。 The present invention is roughly constructed as described above, but in short, it includes a wide slag retention section formed at a suitable position above the hot metal gutter, and a lance that is immersed with its tip in contact with the hot metal flow path at that position. The gist lies in the following, and as long as such a configuration is provided, the specific shape of the hot metal trough 1, the structure of the lance, the installation method, etc. can be changed as appropriate. For example, the shape of the slag channel formed in the hot metal trough may be rectangular or polygonal in addition to the examples shown in FIGS. 1 and 5. Further, although the lance 2 shown has four nozzles 2a arranged horizontally, the number of holes is not limited at all.
更に第３、４図に示す様な従来例では、ランス
２の先端に下向きに設けた噴出ノズル２ａより、
精錬剤Ｆがキヤリアガスと共に吹込まれるため、
該吹込み位置に面した樋下面耐火物［ハの位置］
が集中的に侵食を受けて劣化する現象が生じてく
るが、本発明では前記第１、２図に示した様に、
噴出ノズル２ａがランス先端近傍に横向きに開口
されているため、ランス浸漬位置の樋下面耐火物
が集中的に侵食を受ける様な恐れもなくなる。し
かも第３、４図の従来例では、前述の如くランス
２が上方からの片持ちであるため、溶銑流の衝突
もしくは精錬剤吹込みの衝撃反作用による振動等
によつてクラツクを生じ易いが、本発明であれば
ランス２は先端を樋の下面に当接して両持ち状態
とされているので前述の様な振動も抑えられ、ク
ラツクを抑制することができる。尚溶銑樋１下面
に対するランス２先端部の当接固定手段として
は、凹凸或は段部を利用した係合乃至嵌合的固定
であつてもよいが、通常はランス１自身の自重
（通常400〜500Kg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
ランスの上方部から昇降装置による降下力を付加
すればより確実である。 Furthermore, in the conventional example shown in FIGS. 3 and 4, from the jet nozzle 2a provided downward at the tip of the lance 2,
Since the refining agent F is blown in with the carrier gas,
Refractories on the lower surface of the gutter facing the injection position [position C]
However, in the present invention, as shown in FIGS. 1 and 2 above,
Since the ejection nozzle 2a is opened laterally near the tip of the lance, there is no fear that the refractory material on the lower surface of the gutter at the lance immersion position will be intensively eroded. Moreover, in the conventional examples shown in FIGS. 3 and 4, since the lance 2 is cantilevered from above as described above, cracks are likely to occur due to vibrations caused by the impact of the hot metal flow or the impact reaction of the injection of the refining agent. According to the present invention, the tip of the lance 2 is in contact with the lower surface of the gutter so that it is supported on both sides, so the vibrations mentioned above can be suppressed and cracks can be suppressed. The means for abutting and fixing the tip of the lance 2 against the lower surface of the molten pig iron gutter 1 may be engagement or fitting fixation using unevenness or steps, but usually the dead weight of the lance 1 itself (usually 400 ~500Kg) and placing it on the bottom of the gutter can be sufficient to secure it. Furthermore, it is more reliable if a descending force is applied from the upper part of the lance by a lifting device.
また本考案で使用するランス２は当然のことな
がら高性能の耐火材によつて形成されるが、必ず
しも全体を耐火材で形成しなければならない訳で
はない。即ち溶銑内へ浸漬される最先端部及び精
錬工程で飛散する溶銑やスラグが大量に付着する
先端部側は耐火材で形成する必要があるものの、
それほどの高熱にさらされることのない上方部側
については、高価で成形性の悪い耐火材を使わな
くともよい。第６図はこうした点を考慮して設計
したランス２の好ましい例を示すものであり、下
方部のみを耐火材２ｂで構成し、上方部は２重管
構造の鋼管２ｃを組付けて水冷構造としている。
そして鋼管部２ｃと耐火材部２ｂを着脱自在と
し、浸食の著しい先端のみを適当な時期に交換す
るものとし、上方側の鋼管部２ｃは長期的に使用
することによつて、ランスに要する経費の低減を
図つている。 Furthermore, although the lance 2 used in the present invention is naturally made of a high-performance refractory material, it does not necessarily have to be made entirely of a refractory material. That is, although the leading edge part that is immersed into the hot metal and the leading edge side to which a large amount of hot metal and slag that are scattered during the refining process adhere, are required to be made of refractory material,
For the upper part, which is not exposed to such high heat, there is no need to use expensive and poorly moldable refractory material. Fig. 6 shows a preferred example of the lance 2 designed with these points in mind. Only the lower part is made of fireproof material 2b, and the upper part is constructed with a water-cooled structure by assembling a steel pipe 2c with a double pipe structure. It is said that
The steel pipe part 2c and the refractory material part 2b are made removable, and only the severely eroded tip is replaced at an appropriate time.The upper steel pipe part 2c is used for a long time, so that the cost required for the lance can be reduced. We are trying to reduce this.
また溶銑樋１についてもスラグライン付近の浸
食を一段と抑制する為、耐火材の内部に空気冷却
管やミスト冷却管を埋設して冷却構造とすること
も有効である。 Further, in order to further suppress erosion near the slag line for the hot metal trough 1, it is also effective to provide a cooling structure by burying an air cooling pipe or a mist cooling pipe inside the refractory material.
［考案の効果］
本考案は以上の様に構成されており、溶銑樋及
びランスの浸食を著しく抑制してその延命化を達
成し得るばかりでなく、溶銑ロスの低減、精錬効
率の向上、更には作業員の安全保障といつた多く
の効果を亨受することができる。[Effects of the invention] The present invention is configured as described above, and it not only significantly suppresses erosion of hot metal troughs and lances and extends their lifespan, but also reduces hot metal loss, improves refining efficiency, and further improves smelting efficiency. can enjoy many benefits such as worker safety.
第１図は本考案に係る連続精錬装置を例示する
概略平面図、第２図は第１図における−線断
面相当図、第３図は従来例を示す概略縦断面図、
第４図は第３図における−線断面相当図、第
５図は本考案の他の実施例をしめす概略平面図、
第６図は本考案で使用するランスの具体例を示す
要部縦断面図、第７図は溶銑樋における脱珪剤吹
込み位置全体を広幅にして脱珪処理を行なつた場
合（比較例）と、スラグラインを含めた上方側の
みを平幅にした溶銑樋を用いて脱珪処理を行なつ
た場合（本考案実施例）について、経過時間と脱
珪効率（Si％）の関係を対比して示すグラフであ
る。
１……溶銑樋、１ｂ……スラグ滞留部、２……
ランス、Ｍ……溶銑、Ｓ……精錬スラグ、Ｆ……
精錬剤、Ｇ……吹込みガス。
FIG. 1 is a schematic plan view illustrating a continuous refining apparatus according to the present invention, FIG. 2 is a cross-sectional view corresponding to the line - in FIG. 1, and FIG. 3 is a schematic longitudinal sectional view showing a conventional example.
FIG. 4 is a cross-sectional view corresponding to the - line in FIG. 3, FIG. 5 is a schematic plan view showing another embodiment of the present invention,
Figure 6 is a vertical sectional view of the main part showing a specific example of the lance used in the present invention, and Figure 7 is a case in which desiliconization treatment is performed by widening the entire position where the desiliconizing agent is injected in the hot metal sluice (comparative example). ) and the case where desiliconization is performed using a hot metal trough with a flat width only on the upper side including the slag line (example of the present invention), the relationship between elapsed time and desiliconization efficiency (Si%) is It is a graph shown in comparison. 1...Hot metal trough, 1b...Slag retention section, 2...
Lance, M... Hot metal, S... Refined slag, F...
Refining agent, G... Blowing gas.
Claims (1)
を浸漬配置してなる溶鉄の連続精錬装置におい
て、上記溶鉄樋は、上記ランス浸漬位置に至つて
その上方を樋底部側より幅広く形成してスラグ滞
留部を構成すると共に、精錬剤吹込みランスはそ
の先端付近から横向きに噴出ノズルを開口し、該
ランス先端を溶鉄樋の下面に当接したものである
ことを特徴とする溶鉄の連続精錬装置。 In a continuous molten iron refining device in which a lance for injecting a refining agent is immersed into molten iron flowing in a molten iron gutter, the molten iron gutter is formed above the lance immersion position to be wider than the bottom of the gutter to form slag. A continuous molten iron smelting device comprising a refining agent injection lance which forms a retention part and has a jet nozzle opened sideways from near its tip, and the lance tip is in contact with the lower surface of a molten iron gutter. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985100730U JPH0421816Y2 (en) | 1985-07-02 | 1985-07-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985100730U JPH0421816Y2 (en) | 1985-07-02 | 1985-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6211157U JPS6211157U (en) | 1987-01-23 |
| JPH0421816Y2 true JPH0421816Y2 (en) | 1992-05-19 |
Family
ID=30970826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985100730U Expired JPH0421816Y2 (en) | 1985-07-02 | 1985-07-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0421816Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5341610A (en) * | 1976-09-23 | 1978-04-15 | Flinn Jr Henry I | Prime mover |
-
1985
- 1985-07-02 JP JP1985100730U patent/JPH0421816Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5341610A (en) * | 1976-09-23 | 1978-04-15 | Flinn Jr Henry I | Prime mover |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6211157U (en) | 1987-01-23 |
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