JPS6050842B2 - Method for preventing slopping in top-bottom blowing converter - Google Patents
Method for preventing slopping in top-bottom blowing converterInfo
- Publication number
- JPS6050842B2 JPS6050842B2 JP55132375A JP13237580A JPS6050842B2 JP S6050842 B2 JPS6050842 B2 JP S6050842B2 JP 55132375 A JP55132375 A JP 55132375A JP 13237580 A JP13237580 A JP 13237580A JP S6050842 B2 JPS6050842 B2 JP S6050842B2
- Authority
- JP
- Japan
- Prior art keywords
- amount
- slopping
- bottom blowing
- gas
- 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
- C21C5/35—Blowing from above and through the bath
Description
【発明の詳細な説明】
この発明は上下吹錬転炉におけるスロツピング防止方法
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing slopping in a top-bottom blowing converter.
転炉操業において、吹錬中にスラグや溶鋼が突発的に炉
外へ噴出することがある。During converter operation, slag and molten steel may suddenly spout out of the furnace during blowing.
これはスロッピングと呼ばれており、鋼浴の攪拌が不十
分な場合に、浴内の不均一が生じ突発的なＣｏガスが発
生するために生じることが知られている。このスロツピ
ングは出鋼歩留りを著しく悪化させるため、従来よりこ
れを防止するためスラグフォーミングの状態を測定する
ことによりスロツピングを予知し、スロツピングの発生
が予想される場合には上代ランスからのガス吹込量を増
加させこれにより鋼浴の攪拌を増加させる防止方法が行
われている。This is called slopping, and is known to occur when the steel bath is not sufficiently stirred, resulting in non-uniformity within the bath and sudden generation of Co gas. This sloping significantly deteriorates the tapping yield, so in order to prevent this, sloping has traditionally been predicted by measuring the state of slag forming, and if sloping is expected to occur, the amount of gas injected from the upper lance is Measures have been taken to prevent this by increasing the agitation of the steel bath.
しかし、上代ランスのアクションによる鋼浴の攪拌には
限界があること、また特に高炭素材の吹錬等においては
、ソフトブローによりスラグをフォーミングさせて脱リ
ンを行つているため鋼浴の攪拌力は減少する傾向にある
こと等からスロツピングの発生を防止することは極めて
困難であつた。However, there is a limit to the agitation of the steel bath by the action of the old lance, and especially when blowing high carbon materials, dephosphorization is performed by forming slag by soft blowing, so the stirring power of the steel bath is It has been extremely difficult to prevent the occurrence of slopping because of the tendency to decrease.
本発明はこのようなスロツピングを有効に防止する方法
を提供しようとするものであり、底吹きガスによる溶鋼
の攪拌能力に着目し、底吹きガス量を増加することによ
り溶鋼の攪拌を促進し、これによりスロツピングを未然
に防止しようとするものである。The present invention aims to provide a method for effectively preventing such slopping, and focuses on the ability of bottom-blown gas to stir molten steel, and increases the amount of bottom-blown gas to promote stirring of molten steel. This is intended to prevent slopping.
本発明者らは、底吹きガス量による鋼浴の攪拌力を上代
きランスのみによる鋼浴の攪拌力との比較を行い、底吹
きガス量による攪拌力の大きい事を確認した。The present inventors compared the stirring force of a steel bath due to the amount of bottom-blown gas with the stirring force of a steel bath using only an upper lance, and confirmed that the stirring force was large depending on the amount of bottom-blown gas.
第１図は底吹きガス量と鋼浴の均一・混合時間との関係
を示すグラフで、底吹きガス量が０で上代きランスのみ
による攪拌では１００ｓｅｃの時間を要していたものが
少量の底吹きガス量の吹込みで急速に混合が促進される
ことがわかる。したがつて、スロツピング防止のために
鋼浴のＴ攪拌を急速に増加させる必要があるときは、上
代きランスによるアクションよりも底吹きガス量を増加
させるほうが遥かに効率的であるとの知見に至つたもの
である。スロツピングの予知は転炉の目視、吹錬中の音
による判断或いはマイクロ波等によるスラグや鋼浴の高
さ測定等どのような方法を行つても良い。スロツピング
を予知したら底吹きガス量を増加せしめる。これにより
鋼浴の攪拌が促進されてスロツピングを未然に防止する
ことができる。第２図に本発明の操作パターンの一例を
示す。ここではスラグフォーミング量によりスロツピン
グの予知を行つており、スラグフォーミング量が増加し
たことを検出して底吹きガス量を増加させ、スラグフォ
ーミング量が元に戻つてから底吹きガス量を元の量に戻
している。底吹きガス量の増加割合は、約３０％程度が
最も効率的で、これ以上増加させてもスロツピング防止
効果はあまり上らない。Figure 1 is a graph showing the relationship between the amount of bottom blown gas and the uniformity/mixing time of the steel bath. It can be seen that mixing is rapidly promoted by blowing in a bottom-blown gas amount. Therefore, it has been found that when it is necessary to rapidly increase the T-agitation of a steel bath to prevent slopping, it is much more efficient to increase the amount of bottom-blown gas than to use the action of an upper lance. It has been reached. Slopping may be predicted by any method such as visual inspection of the converter, judgment based on sound during blowing, or measurement of the height of the slag or steel bath using microwaves or the like. If slopping is predicted, the amount of bottom blowing gas is increased. This promotes stirring of the steel bath and prevents slopping. FIG. 2 shows an example of the operation pattern of the present invention. Here, slopping is predicted based on the amount of slag forming, and when it detects that the amount of slag forming has increased, the amount of bottom blowing gas is increased, and after the amount of slag forming returns to its original value, the amount of bottom blowing gas is returned to the original amount. is returning to . The most efficient rate of increase in the amount of bottom-blown gas is about 30%, and even if it is increased more than this, the sloping prevention effect will not improve much.
これを第３図のグラフに示す。グラフ中横軸のＬＤは上
吹きランスのみによる場合で底吹きガス量は０．．ａは
通常操業時の底吹きガス量を示す。以上説明したように
、本発明によれば、従来防止することの難しかつたスロ
ツピングを確実かつ効率的に防止することが可能となる
。This is shown in the graph of FIG. LD on the horizontal axis in the graph is when only the top blowing lance is used, and the bottom blowing gas amount is 0. ．． a indicates the amount of bottom-blown gas during normal operation. As explained above, according to the present invention, it becomes possible to reliably and efficiently prevent slopping, which has been difficult to prevent in the past.
第１図は均一混合時間と底吹きガス量との関係る示すグ
ラフ、第２図は本発明の一実施例の操作パターンを示す
グラフ、第３図は底吹きガス量と噴出滓量との関係を示
すグラフである。Fig. 1 is a graph showing the relationship between the uniform mixing time and the amount of bottom blown gas, Fig. 2 is a graph showing the operation pattern of an embodiment of the present invention, and Fig. 3 is a graph showing the relationship between the amount of bottom blown gas and the amount of ejected slag. It is a graph showing a relationship.
Claims (1)
底吹きガス量を増加させ炉内溶鋼の攪拌を増加させるこ
とを特徴とする上下吹錬転炉におけるスロツピング防止
方法。1. A method for preventing slopping in a top-bottom blowing converter, which comprises predicting the occurrence of sloping and increasing the amount of bottom blowing gas based on this prediction to increase stirring of molten steel in the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132375A JPS6050842B2 (en) | 1980-09-25 | 1980-09-25 | Method for preventing slopping in top-bottom blowing converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132375A JPS6050842B2 (en) | 1980-09-25 | 1980-09-25 | Method for preventing slopping in top-bottom blowing converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5757820A JPS5757820A (en) | 1982-04-07 |
| JPS6050842B2 true JPS6050842B2 (en) | 1985-11-11 |
Family
ID=15079896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55132375A Expired JPS6050842B2 (en) | 1980-09-25 | 1980-09-25 | Method for preventing slopping in top-bottom blowing converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6050842B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5941409A (en) * | 1982-08-31 | 1984-03-07 | Sumitomo Metal Ind Ltd | Control of blowing |
| KR100470066B1 (en) * | 2002-12-06 | 2005-02-05 | 주식회사 포스코 | Method of depressing slop by calculating and controlling the retained slag in the oxygen converter after tapping |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5576008A (en) * | 1978-12-05 | 1980-06-07 | Kawasaki Steel Corp | Slag-making control method in converter |
| JPS55104417A (en) * | 1979-02-02 | 1980-08-09 | Kawasaki Steel Corp | Foreseeing method of occurrence of slopping in converter blowing |
| JPS56123315A (en) * | 1980-02-29 | 1981-09-28 | Kawasaki Steel Corp | Method for controlling blowing in converter |
| JPS5743918A (en) * | 1980-08-30 | 1982-03-12 | Kawasaki Steel Corp | Method for preventing spouting in bottom-blown converter jointly using top blow |
-
1980
- 1980-09-25 JP JP55132375A patent/JPS6050842B2/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5576008A (en) * | 1978-12-05 | 1980-06-07 | Kawasaki Steel Corp | Slag-making control method in converter |
| JPS55104417A (en) * | 1979-02-02 | 1980-08-09 | Kawasaki Steel Corp | Foreseeing method of occurrence of slopping in converter blowing |
| JPS56123315A (en) * | 1980-02-29 | 1981-09-28 | Kawasaki Steel Corp | Method for controlling blowing in converter |
| JPS5743918A (en) * | 1980-08-30 | 1982-03-12 | Kawasaki Steel Corp | Method for preventing spouting in bottom-blown converter jointly using top blow |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5757820A (en) | 1982-04-07 |
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