JPS6027722B2 - Gas blowing method into molten iron - Google Patents
Gas blowing method into molten ironInfo
- Publication number
- JPS6027722B2 JPS6027722B2 JP55133966A JP13396680A JPS6027722B2 JP S6027722 B2 JPS6027722 B2 JP S6027722B2 JP 55133966 A JP55133966 A JP 55133966A JP 13396680 A JP13396680 A JP 13396680A JP S6027722 B2 JPS6027722 B2 JP S6027722B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- molten iron
- gas
- powder
- blowing
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】
近年、鋼の精錬において、溶融鉄裕中に位置したノズル
よりガスを吹き込み、格の雛伴を改善し、多大な冶金的
効果を得ようとする方法が実用化されつつある。[Detailed Description of the Invention] In recent years, in steel refining, a method has been put into practical use in which gas is blown into the molten iron through a nozzle to improve the grain flow and obtain great metallurgical effects. It's coming.
このような精錬法においては裕中に位置したノズルの健
全性を保つことが極めて重要であり、特に酸素以外のガ
スを吹き込む場合には、ノズルの閉塞を回避することが
重要である。酸素以外のガス吹き込みにおいて生ずる閉
塞現象はノズル先端でのガス流れの不安定により溶融鉄
がノズル内へ侵入し、ガスによって冷却・凝固・成長す
ることによるものと考えられる。In such a refining method, it is extremely important to maintain the integrity of the nozzle located in the immersion chamber, and especially when blowing gas other than oxygen, it is important to avoid clogging of the nozzle. The clogging phenomenon that occurs when blowing gases other than oxygen is thought to be due to the instability of the gas flow at the tip of the nozzle, causing molten iron to enter the nozzle and be cooled, solidified, and grown by the gas.
これを防止する方法として、ノズル先でのガス線流速を
音速（３３０机／秒）以上に保つことが知られている。
しかし、この方法によるガス吹き込み条件の下限値はガ
ス流速を音速以上にするため吹き込み流量が多く必要で
あり、圧力も葺くなる。裕蝿拝の強弱のコントロールは
吹き込みガス流量の調節で行うのが一般的であり、下限
側がこのように規定される場合制御中は小さく、精錬機
能のフレキシビリティーを欠く結果になる。本発明は、
このような欠点を簾決すべくなされたものであり、溶融
鉄中へ酸素以外のガスを吹き込む精錬法において、裕中
に浸潰されたノズル内周長さ１肌あたり０．２ｋ９ノ分
以上の量の粉体を吹込みのほぼ全時間にわたって添加す
ることを特徴とするノズル詰りの防止法である。前述の
如く、ノズル閉塞を防止する方法は、ノズル先端への溶
融鉄の侵入を回避することであり、ガス単体吹き込みで
の侵入回避条件は、流速を音速以上に保つことであり、
その理由は第２図に示すようにノズル１の先端でのガス
３のジェットコア２の形成による効果によるものである
。As a method for preventing this, it is known to maintain the linear gas flow velocity at the nozzle tip at the speed of sound (330 degrees/second) or higher.
However, the lower limit of the gas blowing conditions according to this method requires a large blowing flow rate in order to make the gas flow velocity higher than the sonic speed, and the pressure becomes too high. Control of the strength of the yobai is generally performed by adjusting the flow rate of the blown gas, and if the lower limit side is defined in this way, it will be small during control, resulting in a lack of flexibility in the refining function. The present invention
This was done to eliminate these drawbacks, and in the refining method in which gases other than oxygen are blown into molten iron, the inner circumference of the nozzle immersed in the molten iron is 0.2 k9 or more per skin of the inner circumference. This is a method for preventing nozzle clogging, which is characterized by adding a certain amount of powder over almost the entire time of blowing. As mentioned above, the method to prevent nozzle clogging is to avoid the intrusion of molten iron into the nozzle tip, and the condition for avoiding intrusion when blowing a single gas is to maintain the flow velocity above the speed of sound.
The reason for this is the effect of the formation of a jet core 2 of the gas 3 at the tip of the nozzle 1, as shown in FIG.
即ち第１図においては、ガス吹き込み条件を音速未満と
した場合ジェットコアの形成が得られずノズル内周エッ
ジ部へ溶融鉄が流入し（矢印Ａ）し、冷却、凝固生成し
閉塞の原因となる。第２図は、ガス吹き込み条件を音速
以上とした場合、安定したジェットコアが形成されコア
部が溶融鉄の流入を抑止（矢印Ｂ）している状態を示す
。In other words, in Fig. 1, when the gas blowing conditions are lower than the sonic speed, a jet core cannot be formed and molten iron flows into the inner edge of the nozzle (arrow A), cools, solidifies, and causes blockage. Become. FIG. 2 shows a state in which a stable jet core is formed and the core portion prevents the inflow of molten iron (arrow B) when the gas blowing conditions are set to the speed of sound or higher.
次に第３図に本発明によるガス３中へ粉体３′を同伴さ
せた場合のノズル先端状態の１例を示す。Next, FIG. 3 shows an example of the state of the nozzle tip when powder 3' is entrained in gas 3 according to the present invention.
粉体３′はノズルーの内周エッジ部に粉体層を形成しつ
つ溶融鉄へ吹き込まれる。固体粉と気体３から成る混合
層４のモーメンタムは気体単独の場合よりも極めて大で
あり、１．５〜２．５肌の格深さでノズル内周長１肌あ
たり０．２ｋ９／分以上の粉体添加を行うことによって
、ガス流量を線流速換算で５０の／秒まで低下させても
ノズルの閉塞を回避出来ることが判明した。粉体添加量
がノズル内周長１肌あたり０．２ｋｇ／分未満ではエッ
ジ部に形成される粉体層の濃度が薄くノズル詰りを回避
するための綾流速は音速以上とすることが必要であった
。また吹込み途中で粉体添加を中断した場合は即座に詰
り現象が進行することが認められ従って吹込みのほぼ全
時間にわたってノズル内周長１弧あたり０．２ｋｇ／分
以上の粉体を添加することが必要である。The powder 3' is blown into the molten iron while forming a powder layer on the inner peripheral edge of the nozzle. The momentum of the mixed layer 4 consisting of solid powder and gas 3 is much larger than that of the gas alone, and is 0.2k9/min or more per skin of the inner circumference of the nozzle at a depth of 1.5 to 2.5 skins. It has been found that by adding powder of 100%, nozzle clogging can be avoided even when the gas flow rate is reduced to 50/sec in terms of linear flow velocity. If the amount of powder added is less than 0.2 kg/min per skin of the inner circumference of the nozzle, the concentration of the powder layer formed at the edge will be thin, and the traverse flow velocity must be higher than the speed of sound to avoid nozzle clogging. there were. Furthermore, if powder addition is interrupted during blowing, it has been observed that the clogging phenomenon progresses immediately.Therefore, powder is added at a rate of 0.2 kg/min or more per arc of inner circumference of the nozzle for almost the entire time of blowing. It is necessary to.
本方法に用いられる粉体の種類は精錬の目的によって異
るが、Ｃａ０，ＣａＣＱ，Ｍｇ○，ＭｇＣ０３、ドロマ
イト、Ｚｒ０２，ＡＩ２０３，Ｓｉ０２，Ｍｇ０−Ｃ，
０粉等である。The types of powder used in this method vary depending on the purpose of refining, but include Ca0, CaCQ, Mg○, MgC03, dolomite, Zr02, AI203, Si02, Mg0-C,
0 powder etc.
本法を用いる態様としては、酸素以外のガスで溶鉄の濃
伴を目的とする浴鉄精錬用ランス、転炉底吹き用ノズル
、溶鋼精錬用ランスであるが次表に比較例と共に実施例
を示す。This method is used in bath iron refining lances for the purpose of enriching molten iron with gases other than oxygen, converter bottom blowing nozzles, and molten steel refining lances, and examples are shown in the following table along with comparative examples. show.
第１図、第２図は従来のガスジェットコァの形成の有無
を示すノズル先端の状態を示す略線図、第３図は本発明
方法によるノズル先端の状態を示す略線図である。
図中１はノズル、２はジェットコア、３はガス、３′は
粉体、４は混合層。
オー図
汁Ｚ図
外３図FIGS. 1 and 2 are schematic diagrams showing the state of the nozzle tip, showing whether or not a conventional gas jet core is formed, and FIG. 3 is a schematic diagram showing the state of the nozzle tip according to the method of the present invention. In the figure, 1 is a nozzle, 2 is a jet core, 3 is a gas, 3' is a powder, and 4 is a mixed layer. O figure soup Z figure outside figure 3
Claims (1)
て、浴中に浸漬されたノズル内周長さ１ｃｍあたり０．
２ｋｇ／分以上の量の粉体を吹き込みのほぼ全時間にわ
たつて添加することを特徴とするノズル詰りの防止法。1 In a refining method in which a gas other than oxygen is blown into molten iron, 0.0.
A method for preventing nozzle clogging, characterized by adding powder in an amount of 2 kg/min or more over almost the entire time of blowing.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55133966A JPS6027722B2 (en) | 1980-09-26 | 1980-09-26 | Gas blowing method into molten iron |
| US06/305,259 US4388113A (en) | 1980-09-26 | 1981-09-24 | Method of preventing damage of an immersed tuyere of a decarburization furnace in steel making |
| ES505740A ES8303534A1 (en) | 1980-09-26 | 1981-09-24 | A METHOD OF PREVENTING DAMAGE TO A SUBMERGED NOZZLE |
| BR8106166A BR8106166A (en) | 1980-09-26 | 1981-09-25 | PROCESS TO PREVENT DAMAGE TO AN IMMERSED VENTANEIRA DE A DECARBURATION OVEN IN STEEL MANUFACTURING AND REDUCE THE SHAKING STRENGTH OF THE CAST METAL BATH |
| ZA816681A ZA816681B (en) | 1980-09-26 | 1981-09-25 | A method of preventing damage of an immersed tuyere of a decarburization furnace in steel making |
| CA000386735A CA1170460A (en) | 1980-09-26 | 1981-09-25 | Method of preventing damage of an immersed tuyere of a decarburization furnace in steel making |
| AU75681/81A AU531023B2 (en) | 1980-09-26 | 1981-09-25 | Preventing damage of an immersed tuyere |
| KR1019810003603A KR860001523B1 (en) | 1980-09-26 | 1981-09-26 | Prevention of damage to the tuyeres of the decarburization furnace in the steelmaking process |
| EP81304470A EP0049148B1 (en) | 1980-09-26 | 1981-09-28 | A method of preventing damage to an immersed tuyere of a decarburization furnace in steel making |
| AT81304470T ATE31551T1 (en) | 1980-09-26 | 1981-09-28 | METHOD OF PREVENTING DAMAGE TO AN IMMERSION NOZZLE OF A STEEL DECARBURIZING FURNACE IN STEELMAKING. |
| DE8181304470T DE3176581D1 (en) | 1980-09-26 | 1981-09-28 | A method of preventing damage to an immersed tuyere of a decarburization furnace in steel making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55133966A JPS6027722B2 (en) | 1980-09-26 | 1980-09-26 | Gas blowing method into molten iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5760005A JPS5760005A (en) | 1982-04-10 |
| JPS6027722B2 true JPS6027722B2 (en) | 1985-07-01 |
Family
ID=15117239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55133966A Expired JPS6027722B2 (en) | 1980-09-26 | 1980-09-26 | Gas blowing method into molten iron |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS6027722B2 (en) |
| ZA (1) | ZA816681B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021217U (en) * | 1983-07-21 | 1985-02-14 | 竹内工業株式会社 | Storage container for lipstick, etc. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52107218A (en) * | 1976-03-05 | 1977-09-08 | Sumitomo Metal Ind Ltd | Desulfurization of molten pig iron outside furnace |
-
1980
- 1980-09-26 JP JP55133966A patent/JPS6027722B2/en not_active Expired
-
1981
- 1981-09-25 ZA ZA816681A patent/ZA816681B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5760005A (en) | 1982-04-10 |
| ZA816681B (en) | 1982-09-29 |
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