JPH02101106A - Desiliconizing method on casting floor - Google Patents
Desiliconizing method on casting floorInfo
- Publication number
- JPH02101106A JPH02101106A JP25378688A JP25378688A JPH02101106A JP H02101106 A JPH02101106 A JP H02101106A JP 25378688 A JP25378688 A JP 25378688A JP 25378688 A JP25378688 A JP 25378688A JP H02101106 A JPH02101106 A JP H02101106A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- desiliconizing
- desiliconization
- desiliconizing agent
- agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005266 casting Methods 0.000 title 1
- 239000007789 gas Substances 0.000 claims abstract description 31
- 238000010586 diagram Methods 0.000 claims abstract description 16
- 239000012159 carrier gas Substances 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 22
- 238000007654 immersion Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 44
- 238000007664 blowing Methods 0.000 abstract description 5
- 230000009545 invasion Effects 0.000 abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000005261 decarburization Methods 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000011160 research Methods 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
- 239000002893 slag Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、溶銑樋を流れる溶銑に脱珪剤をキャリアーガ
ス（以下ガスと略す）と共にインジェクションする鋳床
での脱珪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 desiliconization in a cast bed, in which a desiliconizing agent is injected into hot metal flowing through a hot metal trough together with a carrier gas (hereinafter abbreviated as gas). .
〈従来の技術〉
高炉鋳床における脱珪方法として、溶銑樋を流れる溶銑
にインジェクションランスを浸漬し、ガスと共に脱珪剤
を吹き込む技術が開発されてきている。特開昭６２−７
８０９号公報には、浸漬ランスの先端から横向きに、溶
銑予備処理剤を吹込むことにより、溶銑樋下部の耐火物
の損耗を防ぐ技術が開示されている。しかし、この発明
は、ランスの浸漬部分がランスのノズルから噴出するガ
スによって漫触され寿命が短いという問題があった。そ
こで、本発明者らはこの問題を解決するために、先に出
願した特願昭６２−２２９７４３号において、予備処理
剤吹込ノズルが、横方向に張り出すように先端部が突設
されている浸漬ランスを用いて、脱珪効率を高め、かつ
ランスの寿命を延長する溶銑予備処理方法を折本した。<Prior Art> As a desiliconization method in a blast furnace casthouse, a technique has been developed in which an injection lance is immersed in hot metal flowing through a hot metal trough, and a desiliconization agent is injected together with gas. Japanese Patent Publication No. 62-7
Publication No. 809 discloses a technique for preventing wear and tear of refractories in the lower part of a hot metal gutter by injecting a hot metal pretreatment agent sideways from the tip of an immersion lance. However, this invention has a problem in that the immersed portion of the lance is exposed to gas ejected from the nozzle of the lance, resulting in a short life span. Therefore, in order to solve this problem, the present inventors proposed in the previously filed Japanese Patent Application No. 62-229743 that the tip of the pretreatment agent injection nozzle was provided so as to protrude laterally. A method for pretreatment of hot metal using an immersion lance that increases the desiliconization efficiency and extends the life of the lance was published.
しかし、この方法を用いる場合でも、脱珪の操業条件、
例えば脱珪剤の粒径を変更した場合、脱珪効率の良い条
件を見つけるのに長時間を必要とするという問題があっ
た。However, even when using this method, the operating conditions for desiliconization
For example, when the particle size of the desiliconizing agent is changed, there is a problem in that it takes a long time to find conditions with good desiliconizing efficiency.
〈発明が解決しようとする課題〉
本発明は、脱珪操業条件の変更に速かに対応できるラン
スのノズル長さおよびノズル径を具えた浸漬ランスを選
択でき、更にキャリアーガス量を減少しても、脱珪剤を
十分加速して脱珪処理を行える脱珪方法をを提供するた
めになされたものである。<Problems to be Solved by the Invention> The present invention makes it possible to select an immersion lance with a lance nozzle length and nozzle diameter that can quickly respond to changes in desiliconization operation conditions, and further reduces the amount of carrier gas. The present invention was also made in order to provide a desiliconization method that can perform desiliconization treatment by sufficiently accelerating the desiliconization agent.
く課題を解決するための手段〉
本発明は、■溶銑樋を流れる溶銑中に浸漬ランスの先端
から横向きに脱珪剤をキャリアーガスと共に吹込む脱珪
方法において、脱珪操業条件にもとづいて脱珪剤の粒径
と密度ごとに予め作成したノズル長さとノズル先端での
脱珪剤速度との関係をノズル先端でのをキャリアーガス
流速側に図示し、かつ脱珪剤進入限界速度を付記した特
性図と、ノズル径とキャリアーガス流量との関係をノズ
ル先端でのをキャリアーガス流速側に図示した特性図と
を使用して、ノズル先端での脱珪剤速度が脱珪剤進入限
界速度を超えるようになるノズル長さ。Means for Solving the Problems> The present invention provides: (1) a desiliconization method in which a desiliconizing agent is injected sideways from the tip of an immersion lance together with a carrier gas into hot metal flowing through a hot metal trough; The relationship between the nozzle length created in advance for each silica particle size and density and the desiliconization agent speed at the nozzle tip is illustrated on the carrier gas flow rate side, and the limit speed of desiliconization agent entry is also added. Using the characteristic diagram and the characteristic diagram that shows the relationship between nozzle diameter and carrier gas flow rate at the nozzle tip on the carrier gas flow velocity side, it is possible to determine that the desiliconization agent speed at the nozzle tip is the limit speed for desiliconization agent entry. Nozzle length to be exceeded.
ノズル径を満足する浸漬ランスを用いることを特徴とす
る鋳床における脱珪方法であり、■前■項において、満
足するノズル径が複数ある場合には、キャリアーガス流
量が少いノズル径を有する浸漬ランスを用いることを特
徴とする鋳床における脱珪方法である。This is a desiliconization method in a casthouse characterized by using an immersion lance that satisfies the nozzle diameter. This is a method for desiliconization in a casthouse, characterized by using an immersion lance.
〈発明をなす至った経過及び作用〉
従来の溶銑樋を流れる溶銑に脱珪剤をキャリアーガスと
共に吹き込んだ脱珪方法では、脱珪反応の他に脱炭反応
も相当量起こっていることが、本発明者らの研究の結果
判明した。従来法による脱炭効率と脱珪効率との関係を
第５図の゛′Ａ″領域に示した。従来法では脱珪剤中に
含まれる有効酸素Ｗ（反応に寄与し得る酸素量）のうち
の２５％〜３５％が脱炭反応に関与している。脱珪効率
を向上させるためには反応を第５図中（１）〜（４）の
方向に進めれば良い。しかしながら脱珪剤の反応効率（
＝脱珪効率十脱炭効率）は、領域′″Ａ″′の形から判
るようにほぼ８０％と一定になっている。これは、８０
％以上反応が進むと脱珪スラグの粘性が極端に高くなり
、反応がほとんど起こらなくなるためであるが、このた
めに同じ脱珪剤を使用する限りでは第５図中の（１）〜
（３）の方向に領域を移動させることが不可能である。<Process and operation leading to the invention> In the conventional desiliconization method in which a desiliconizing agent is injected together with a carrier gas into hot metal flowing through a hot metal trough, a considerable amount of decarburization reaction occurs in addition to the desiliconization reaction. This was discovered as a result of research by the present inventors. The relationship between decarburization efficiency and desiliconization efficiency in the conventional method is shown in area ``A'' in Figure 5.In the conventional method, the amount of available oxygen W (the amount of oxygen that can contribute to the reaction) contained in the desiliconization agent is 25% to 35% of this is involved in the decarburization reaction.In order to improve the desiliconization efficiency, the reaction should proceed in the directions (1) to (4) in Figure 5.However, the desiliconization reaction efficiency of the agent (
= desiliconization efficiency + decarburization efficiency) is constant at approximately 80%, as can be seen from the shape of region ``A''. This is 80
% or more, the viscosity of the desiliconizing slag becomes extremely high and almost no reaction occurs.For this reason, as long as the same desiliconizing agent is used, (1) to (1) in Figure 5.
It is impossible to move the area in the direction (3).
そこで（４）の方向への反応を制御すべく試験を行った
結果、ガス量を減少させることが効果的であることがわ
かった。しかしながら、ガス量を減少させずぎると脱珪
剤５のノズル２先端速度がおそくなり、脱珪剤が気泡に
トラップされ気泡７．をつき破って溶銑８中に深く進入
できなくなり、反応効率の低下をきたしたことが判明し
た（第、６図参照）。Therefore, as a result of conducting tests to control the reaction in the direction (4), it was found that reducing the amount of gas is effective. However, if the gas amount is not reduced too much, the speed at the tip of the nozzle 2 of the desiliconizing agent 5 becomes slow, and the desiliconizing agent is trapped in air bubbles, resulting in air bubbles 7. It was found that the hot metal could not penetrate deeply into the hot metal 8, resulting in a decrease in reaction efficiency (see Figure 6).
そこで力のつり合いから求まる脱珪剤が溶銑中に侵入す
る脱珪剤進入限界速度、その脱珪剤進入限界速度を得る
ためのガス流量、ノズル長さなどの関係を用いて、浸漬
ランスを設計し、操業条件を決定すればよいとの知見を
えて本発明を完成するに至った。Therefore, an immersion lance is designed using the relationship between the critical speed of the desiliconizing agent entering the hot metal, the gas flow rate and nozzle length to obtain the critical speed of desiliconizing agent entering the hot metal, which is determined from the balance of forces. However, the present invention was completed based on the knowledge that it was only necessary to determine the operating conditions.
本発明では、脱珪操業条件にもとづいて脱珪剤の進入限
界速度を得ることができるノズル長さ、ノズル径をもっ
た浸漬ランスを゛使用するようにしたので、迅速に脱珪
操業条件変更に対応することができ、またガス量を減少
させても脱珪剤は気泡を突ぎ破って溶銑中に深く進入で
き脱珪率を向上させることができる。In the present invention, an immersion lance is used that has a nozzle length and nozzle diameter that allow the desiliconizing agent to reach the limit speed based on the desiliconizing operating conditions, so that desiliconizing operating conditions can be changed quickly. Furthermore, even if the amount of gas is reduced, the desiliconizing agent can break through the bubbles and penetrate deeply into the hot metal, improving the desiliconization rate.
〈実施例〉
脱珪剤（粒径１００μｍ、密度３３００ｋｇ／ｒｒｆ）
が各ガス流速にさらされた場合の加速距離（ノズル長さ
） ｆｆｉ （ｍ＋＋Ｉ）と脱珪剤のノズル先端速度Ｖ
ｒ（ｍ／Ｓ）との関係を第１・図に示した。Ｖｒ≧１３
（ｍ／Ｓ）で脱珪剤は溶銑中へ進入することができる。<Example> Desiliconizing agent (particle size 100 μm, density 3300 kg/rrf)
Acceleration distance (nozzle length) ffi (m++I) and desiliconizing agent nozzle tip speed V when exposed to each gas flow rate
The relationship with r(m/S) is shown in Figure 1. Vr≧13
(m/S), the desiliconizing agent can enter into the hot metal.
■ｒ′≧１３となるのはガス流速５０．６０．７０．８
０ （ｍ／Ｓ）の場合、加速距離（ノズル長さ）！がそ
れぞれ１２０．．８０．６５．５５＋ｎｎ＋以上である
。漫漬ランスの設計に際しては、ノズル先端の溶損を考
慮してこの長さに１０〜２０ｍｍ程度加えた長さとす方
が良い。■When r'≧13, the gas flow rate is 50.60.70.8
If 0 (m/S), acceleration distance (nozzle length)! are 120. each. ．． 80.65.55+nn+ or more. When designing a dipping lance, it is better to add about 10 to 20 mm to this length in consideration of melting damage at the tip of the nozzle.
ノズル径が同じであれば、ガス流量を減少さゼるにはノ
ズル先端でのガス流速（ｍ／ｓ）は小さい方が良いが、
第１図からも明らかなように、小さければ加速距離（ノ
ズル長さ）が長くなり、浸漬ランスが大型化し、取扱い
ずらくなるので設備とのかね合いて適当なガス流速を選
択すればよい。If the nozzle diameter is the same, it is better to reduce the gas flow velocity (m/s) at the nozzle tip in order to reduce the gas flow rate.
As is clear from FIG. 1, if the velocity is small, the acceleration distance (nozzle length) will be long, the immersion lance will be large, and it will be difficult to handle. Therefore, an appropriate gas flow velocity should be selected in consideration of the equipment.
第２図に２０ランスの場合の各ノズル部分での所定のガ
ス流速を得るためのノズル径ｄ （ｍ）とガス流量Ｇ
（Ｎｒｒｆ／ｍｉｎ ）の関係を示した。例えば第１図
からガス流速６０ｍ／ｓを選択したとし、ノズル部分で
のガス流速を６０ｍ／ｓとするためのノズル径、ガス流
量の組合わせ（ｄ、Ｇ）で表わすと（０，０２ｍ、
２．５Ｎｎ（／ｍｉｎ ）、 （０，０１５ｍ。Figure 2 shows the nozzle diameter d (m) and gas flow rate G to obtain the specified gas flow velocity at each nozzle portion in the case of 20 lances.
(Nrrf/min). For example, assuming that a gas flow velocity of 60 m/s is selected from Fig. 1, the combination (d, G) of the nozzle diameter and gas flow rate to make the gas flow velocity at the nozzle part 60 m/s is (0.02 m,
2.5Nn (/min), (0,015m.
１．４ Ｎ ｆ ／ ｍｉｎ ）が得られる。このよう
にしてノズル径、ガス流量を決定すれば良い。1.4 N f /min) is obtained. The nozzle diameter and gas flow rate may be determined in this way.
第５図において（４）の方向に反応を進め脱珪率を上げ
るためには、ガス流量Ｇを減少させる必要があるので、
本例では（０，０２，２，５）→（０，０１５，１，４
）の方向に改善すれば良い。すなわち第３図（ａ）に示
した浸漬ランスを第３図（ｂ）に示した浸漬ランスに変
更すれば良いことになる。In Fig. 5, in order to advance the reaction in the direction of (4) and increase the silicon removal rate, it is necessary to reduce the gas flow rate G.
In this example, (0,02,2,5)→(0,015,1,4
) should be improved in this direction. That is, the immersion lance shown in FIG. 3(a) may be changed to the immersion lance shown in FIG. 3(b).
本発明の特徴は、操業条件である脱珪剤の粒径。The feature of the present invention is the particle size of the desiliconizing agent, which is an operating condition.
ガス量、ノズル径等を変更する時にあらかじめ変更する
条件に応じた第１図、第２図のような線図を作成してお
くことによって、迅速に最適操業条件に移行できる点に
ある。When changing the gas amount, nozzle diameter, etc., by preparing diagrams such as those shown in FIGS. 1 and 2 in advance according to the conditions to be changed, it is possible to quickly shift to the optimum operating conditions.
本発明の具体的実施例を以下に説明する。Specific embodiments of the present invention will be described below.
第４図（ｂ）に脱珪剤変更時（粒径： １００ ｔｎｎ
−３０ｐｍ 。Figure 4(b) shows when the desiliconizing agent is changed (particle size: 100 tnn
-30pm.
密度： ３３００ｋｇ／ ｎｆ ）の従来方法による脱
珪効率の推移を示した。従来は脱珪剤の変更後に、浸漬
ランスのノズル径、ガス量を試行錯誤的に変更、改善し
ていたため、最適操業条件を得るために約２ケ月の期間
を要した。第４図（ａ）に脱珪剤変更時にガス量を低減
した（ ２．５ＮＩＴｆ／ｍｉｎ →１．４ Ｎｎｉ／
ｍ１ｎ）本発明方法による脱珪効率の推移を示した。The graph shows the change in desiliconization efficiency according to the conventional method at a density of 3300 kg/nf. Conventionally, after changing the desiliconizing agent, the nozzle diameter and gas amount of the immersion lance were changed and improved through trial and error, and it took about two months to obtain the optimal operating conditions. Figure 4(a) shows that the gas amount was reduced when changing the desiliconizing agent (2.5 NITf/min → 1.4 Nni/min).
m1n) The transition of desiliconization efficiency by the method of the present invention is shown.
この場合は、第１図、第２図の線図をあらかじめ用意し
、最適操業条件を求めておいたので、最適条イ′１にす
るためにわずか半月しかかからなかった。In this case, since the diagrams shown in FIGS. 1 and 2 were prepared in advance and the optimum operating conditions were determined, it took only half a month to obtain the optimum strip A'1.
この時の脱珪効率と脱炭効率との関係を第５図中の領域
ＩＴ Ｂ Ｉ＋に示した。この時の操業条件は、ノズル
径：０．０１５ｍ 、加速距離：０．１ｍ、ガス流量：
１．４Ｎｎｆ／ｍｉｎ 、脱珪剤吹込速度：５０ｋｇ／
ｍｉｎであり、脱珪効率６０〜６５％を得ることができ
た。尚、変更前は、ノズル径０．０２ｍ、加速距離０．
１ｍ、ガス流量２．５Ｎ ｒｒｆ ／ｍｉｎ、脱珪剤吹
込速度６０ｋｇ／ｍｉｎで脱珪効率は４９〜５５％であ
った。The relationship between the desiliconization efficiency and the decarburization efficiency at this time is shown in the area ITBI+ in FIG. The operating conditions at this time were: nozzle diameter: 0.015 m, acceleration distance: 0.1 m, gas flow rate:
1.4Nnf/min, desiliconizing agent blowing speed: 50kg/
It was possible to obtain a desiliconization efficiency of 60 to 65%. Before the change, the nozzle diameter was 0.02m and the acceleration distance was 0.02m.
1 m, a gas flow rate of 2.5 N rrf /min, and a desiliconizing agent blowing rate of 60 kg/min, the desiliconization efficiency was 49 to 55%.
以上から明らかなように、本発明によると脱珪操業条件
を変更時に迅速に最適な操業条件に移行でき、さらにガ
ス流量を減少させた場合にも脱珪効率を向上できた。As is clear from the above, according to the present invention, when the desiliconization operating conditions were changed, it was possible to quickly shift to the optimum operating conditions, and furthermore, even when the gas flow rate was reduced, the desiliconization efficiency was improved.
以」二脱珪操業について本発明の詳細な説明したが、こ
れは何も脱珪操業だけに限ったことではなく、同様な方
法によって行う溶銑予備処理（脱隣、脱硫）にも本発明
を適用することが□可能である。Hereinafter, the present invention has been described in detail regarding the second desiliconization operation, but this is not limited to only the desiliconization operation, and the present invention can also be applied to hot metal pretreatment (desiliconization, desulfurization) performed by a similar method. It is possible to apply.
また、浸漬ランスは２０ランスの実施例を示したが、３
０．４０などの多口ランスあるいは単口ランスの場合に
も本発明を適用することができる。In addition, an example of 20 immersion lances was shown, but 3 lances were used.
The present invention can also be applied to a multi-mouth lance such as 0.40 or a single-mouth lance.
〈発明の効果〉
本発明により、脱珪操業条件変更時に迅速に最適な操業
条件に移行するきとができた。また、ガス流量を減少さ
ゼた場合にも脱珪剤を十分加速して吹き込むことが可能
となり、脱珪効率を向上させることができた。<Effects of the Invention> According to the present invention, it has become possible to quickly shift to optimal operating conditions when changing desiliconization operating conditions. Furthermore, even when the gas flow rate was reduced, it became possible to inject the desiliconizing agent at sufficient speed, thereby improving the desiliconizing efficiency.
第１図は、本発明のランス設計の根拠となる各ガス流速
での脱珪剤のノズル先端速度Ｖｒとノズル長さ２との関
係を示した特性図、第２図は、各ガス流速を得るガス流
量Ｇとノズル径ｄの関係を示した特性図、第３図は改善
前後の浸漬ランス形状を示した概略断面図、第４図は、
従来方法（ｂ）及び本発明方法（ａ）による脱珪効率の
推移を示した特性図、第５図は、脱炭効率と脱珪効率と
の関係を示した特性図、第６図は、脱珪剤が吹き込まれ
る状況を示した模式図である。
ｌ・・・浸漬ランス、 ２・・・ノズル、３・
・・脱珪剤輸送管、 ４・・・耐火物、５・・・脱
珪剤、
６・・・気泡にトラップされた脱珪剤、７・・・気
泡、
８・・・溶
銑、
９・・・溶銑ｍ。Figure 1 is a characteristic diagram showing the relationship between the nozzle tip speed Vr of the desiliconizing agent and the nozzle length 2 at each gas flow rate, which is the basis for the lance design of the present invention, and Figure 2 is a characteristic diagram showing the relationship between the nozzle length 2 and the nozzle tip speed Vr of the desiliconizer at each gas flow rate, which is the basis for the lance design of the present invention. A characteristic diagram showing the relationship between the obtained gas flow rate G and the nozzle diameter d, Figure 3 is a schematic sectional view showing the immersion lance shape before and after improvement, and Figure 4 is
A characteristic diagram showing the transition of desiliconization efficiency according to the conventional method (b) and the method (a) of the present invention, FIG. 5 is a characteristic diagram showing the relationship between decarburization efficiency and desiliconization efficiency, and FIG. FIG. 2 is a schematic diagram showing a situation in which a desiliconizing agent is blown into the structure. l... Immersion lance, 2... Nozzle, 3...
... desiliconizing agent transport pipe, 4... refractory, 5... desiliconizing agent, 6... desiliconizing agent trapped in air bubbles, 7... air bubbles, 8... hot metal, 9. ...Hot metal m.
Claims (1)
きに脱珪剤をキャリアーガスと共に吹込む脱珪方法にお
いて、脱珪操業条件にもとづいて脱珪剤の粒径と密度ご
とに予め作成したノズル長さとノズル先端での脱珪剤速
度との関係をノズル先端でのキャリアーガス流速別に図
示し、かつ脱珪剤進入限界速度を付記した特性図と、ノ
ズル径とキャリアーガス流量との関係をノズル先端での
キャリアーガス流速別に図示した特性図とを使用して、
ノズル先端での脱珪剤速度が脱珪剤進入限界速度を超え
るようになるノズル長さ、ノズル径を満足する浸漬ラン
スを用いることを特徴とする鋳床における脱珪方法。 ２、請求項１において、満足するノズル径が複数ある場
合には、キャリアーガス流量が少ないノズル径を有する
浸漬ランスを用いることを特徴とする鋳床における脱珪
方法。[Scope of Claims] 1. In a desiliconization method in which a desiliconizing agent is injected sideways from the tip of an immersion lance together with a carrier gas into hot metal flowing through a hot metal trough, the particle size of the desiliconizing agent and The relationship between the nozzle length and the desiliconizing agent speed at the nozzle tip prepared in advance for each density is illustrated for each carrier gas flow rate at the nozzle tip, and the characteristic diagram with the desiliconizing agent entry limit speed added, as well as the nozzle diameter and carrier Using a characteristic diagram showing the relationship with gas flow rate for each carrier gas flow velocity at the nozzle tip,
A method for desiliconization in a casthouse, characterized by using an immersion lance that satisfies the nozzle length and nozzle diameter such that the desiliconization agent speed at the nozzle tip exceeds the desiliconization agent entry limit speed. 2. A method for desiliconization in a cast bed according to claim 1, characterized in that, when there are a plurality of nozzle diameters that satisfy the requirements, an immersion lance having a nozzle diameter with a small carrier gas flow rate is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25378688A JPH066730B2 (en) | 1988-10-11 | 1988-10-11 | Desiliconization method in casting floor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25378688A JPH066730B2 (en) | 1988-10-11 | 1988-10-11 | Desiliconization method in casting floor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02101106A true JPH02101106A (en) | 1990-04-12 |
| JPH066730B2 JPH066730B2 (en) | 1994-01-26 |
Family
ID=17256130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25378688A Expired - Lifetime JPH066730B2 (en) | 1988-10-11 | 1988-10-11 | Desiliconization method in casting floor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066730B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024185A (en) * | 2005-07-15 | 2007-02-01 | Kikuchiseisakusho Co Ltd | Actuator, parallel link mechanism using the same, and long-sized material bending device |
-
1988
- 1988-10-11 JP JP25378688A patent/JPH066730B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024185A (en) * | 2005-07-15 | 2007-02-01 | Kikuchiseisakusho Co Ltd | Actuator, parallel link mechanism using the same, and long-sized material bending device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH066730B2 (en) | 1994-01-26 |
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