JPH0551618A - Desiliconizing method for molten iron - Google Patents
Desiliconizing method for molten ironInfo
- Publication number
- JPH0551618A JPH0551618A JP20674691A JP20674691A JPH0551618A JP H0551618 A JPH0551618 A JP H0551618A JP 20674691 A JP20674691 A JP 20674691A JP 20674691 A JP20674691 A JP 20674691A JP H0551618 A JPH0551618 A JP H0551618A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- molten iron
- hot metal
- desiliconizing
- ladle
- 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.)
- Pending
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、溶銑に脱珪剤を吹き
込んで行なう溶銑の脱珪方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot metal desiliconizing method in which a desiliconizing agent is blown into hot metal.
【０００２】[0002]
【従来の技術】従来から、取鍋精錬の代わりに、溶銑に
脱珪剤を投入して行なう溶銑の脱珪方法が行なわれてい
る。この方法には、特開平２−９７６１０号公報に記載
されているように、上置き方法と吹込み方法がある。2. Description of the Related Art Conventionally, a hot metal desiliconizing method has been performed, in which a desiliconizing agent is added to hot metal instead of ladle refining. As this method, as described in Japanese Patent Application Laid-Open No. 2-97610, there are a placing method and a blowing method.
【０００３】上置き方法は、出銑樋上に設けたホッパー
内の脱珪剤を切出しフィーダーを介して出銑樋を流れる
溶銑の表面上に上置きし、溶銑が傾注樋から落下注入さ
れるときの混合、攪拌を利用して溶銑の脱珪を行なうも
のである。[0003] The method of placing is to place the desiliconizing agent in the hopper provided on the tapping gutter on the surface of the hot metal flowing through the tapping gutter through the feeder, and when the hot metal is dropped and poured from the tilting gutter. The hot metal is desiliconized by mixing and stirring.
【０００４】吹込み方法は、出銑樋の近傍に設けられた
タンクに搬送用ガス（Ｎ2 ，Ａｒ，ＣＯ2 ，空気）を圧
入し、タンク内の脱珪剤を気送管を通してランスの先端
から出銑樋を流れる溶銑に吹込むものである。また、溶
銑鍋やトーピードカーの溶銑にランスを介して脱珪剤を
吹込む吹込み方法も行なわれている。これらの脱珪方法
は、いずれも大気圧下で行なわれている。The blowing method is as follows. A carrier gas (N 2 , Ar, CO 2 , air) is press-fitted into a tank provided in the vicinity of the tap pipe, and the desiliconizing agent in the tank is passed through a pneumatic pipe to a lance. It is blown into the hot metal that flows through the tapping gutter from the tip. In addition, a method of blowing a desiliconizing agent into the hot metal of a hot metal pot or a torpedo car through a lance is also used. All of these desiliconization methods are performed under atmospheric pressure.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
方法には次のような問題点がある。 脱珪酸素効率（脱珪に使われた酸素量／投入脱珪剤
に含まれる酸素量％）が４０〜７０％と低い。 脱珪に使用されない酸素３０〜６０％の大半が脱炭
反応（２Ｃ＋Ｏ2 →２ＣＯ）を起こし、その発生ＣＯが
スラグのフォーミング（泡立ち）を引き起こすため、溶
銑鍋等の受銑量を低下させる。However, the conventional method has the following problems. Desiliconization oxygen efficiency (oxygen amount used for desiliconization / oxygen amount contained in desiliconization agent input) is as low as 40 to 70%. Most of 30 to 60% of oxygen not used for desiliconization causes a decarburization reaction (2C + O 2 → 2CO), and the generated CO causes slag forming (foaming), thus lowering the amount of pig iron received in a hot metal ladle or the like.
【０００６】[0006]
【課題を解決するための手段】本発明は上記のような問
題点を解決しようとするもので、溶銑に脱珪剤を投入し
て溶銑の脱珪を行なう溶銑の脱珪方法において、高圧下
の溶銑に脱珪剤を吹き込んで脱珪を行なうことを特徴と
する溶銑の脱珪方法である。DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and in a hot metal desiliconizing method in which a desiliconizing agent is added to hot metal to desilver the hot metal, Is a method of desiliconizing hot metal, which comprises performing desiliconization by blowing a desiliconizing agent into the hot metal.
【０００７】[0007]
【作用】図３は脱珪反応（Ｓｉ＋Ｏ2 →ＳｉＯ2 ）と脱
炭反応（２Ｃ＋Ｏ2 →２ＣＯ）の優先評価図である。大
気圧下において脱珪を行なう溶銑の温度範囲（図の破線
の温度範囲１４００〜１６００℃）について見ると、平
衡論的には、ｍ温度範囲にあるときは脱珪反応が優先的
に進行するが、ｎ温度範囲にあるときは脱炭反応が優先
的に進行するようになる。即ち、ｎ温度範囲で脱炭反応
が優先的に進行するため、脱珪酸素効率が著しく低下す
る。FUNCTION FIG. 3 is a priority evaluation diagram of the desiliconization reaction (Si + O 2 → SiO 2 ) and the decarburization reaction (2C + O 2 → 2CO). Looking at the temperature range of hot metal for desiliconization under atmospheric pressure (temperature range 1400 to 1600 ° C indicated by the broken line in the figure), equilibrium theory shows that the desiliconization reaction preferentially proceeds in the m temperature range. However, when it is in the n temperature range, the decarburization reaction preferentially proceeds. That is, since the decarburization reaction preferentially proceeds in the n temperature range, the desiliconization oxygen efficiency is significantly reduced.
【０００８】溶銑上の雰囲気圧力を増加すると、平衡直
線ｂは上方に平行移動し、２気圧（２ａｔｍ）では直線
ｃとなる。一方、平衡直線ａは、雰囲気圧力を増加して
もその位置は殆ど変わらない。従って、脱珪を行なう溶
銑温度範囲において脱炭反応が起こり得ない雰囲気圧力
まで増加すると、脱珪酸素効率が向上し、また脱炭反応
が起こらないからスラグフォーミングが起こらず溶銑鍋
等の受銑量を増加することができる。When the atmospheric pressure on the hot metal is increased, the equilibrium straight line b is translated upward and becomes a straight line c at 2 atm (2 atm). On the other hand, the position of the equilibrium straight line a hardly changes even if the atmospheric pressure is increased. Therefore, if the atmospheric pressure is increased so that the decarburization reaction cannot occur in the hot metal temperature range for desiliconization, the desiliconization oxygen efficiency is improved, and since the decarburization reaction does not occur, slag forming does not occur and the hot metal such as hot metal ladle The amount can be increased.
【０００９】[0009]
【実施例】本発明の実施例を図面に基づいて以下に説明
する。図１は溶銑鍋で行なう本発明方法の説明図であ
る。台車１に乗せられた溶銑鍋２に溶銑３を受銑した
後、溶銑鍋２の開口部に圧力蓋４を取り付ける。圧力蓋
４に設けた圧力空気吹込み管の挿入口を通して圧力空気
吹込み管５の先端を圧力蓋４の下の空間６に挿入し、圧
力蓋４に設けたランス挿入口を通して溶銑鍋内に脱珪剤
吹込みランス７を挿入する。圧力空気吹込み管５から圧
力空気が、空間６に吹き込まれ、空間の圧力が所定圧力
（溶銑温度の範囲内で脱炭反応が起こり得ない雰囲気圧
力、例えば２気圧）に維持される。圧力調整は、圧力空
気吹込み管５の途中に設けた圧力調整弁９により行な
う。空間６の雰囲気圧力が所定圧力に維持された後、ラ
ンス７が溶銑３中に挿入され、ランス７の先端から脱珪
剤（ミルスケール等）がキャリアガスと共に吹き込まれ
脱珪が行なわれる。なお、図では、溶銑鍋２の溶銑３の
温度を測定するために、温度計８が圧力蓋４を通して溶
銑３中に挿入されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of the method of the present invention performed in a hot metal ladle. After the hot metal 3 is received by the hot metal ladle 2 placed on the carriage 1, the pressure lid 4 is attached to the opening of the hot metal ladle 2. The tip of the pressure air blowing pipe 5 is inserted into the space 6 below the pressure lid 4 through the insertion port of the pressure air blowing pipe provided in the pressure lid 4, and is inserted into the hot metal ladle through the lance insertion port provided in the pressure lid 4. Insert the descaling agent blowing lance 7. Pressure air is blown into the space 6 from the pressure air blowing pipe 5, and the pressure of the space is maintained at a predetermined pressure (atmospheric pressure at which decarburization reaction cannot occur within the range of the hot metal temperature, for example, 2 atm). The pressure is adjusted by a pressure adjusting valve 9 provided in the middle of the pressurized air blowing pipe 5. After the atmospheric pressure in the space 6 is maintained at a predetermined pressure, the lance 7 is inserted into the hot metal 3 and a silicon removal agent (mill scale or the like) is blown from the tip of the lance 7 together with a carrier gas to perform silicon removal. In the figure, in order to measure the temperature of the hot metal 3 of the hot metal ladle 2, a thermometer 8 is inserted into the hot metal 3 through the pressure lid 4.
【００１０】図２はトーピードカーで行なう本発明方法
の説明図である。台車１に乗せられたトーピード１０の
開口部に圧力蓋４が取付けられ、上記溶銑鍋と同様方法
で脱珪が行なわれる。FIG. 2 is an explanatory view of the method of the present invention performed by a torpedo car. The pressure lid 4 is attached to the opening of the torpedo 10 placed on the trolley 1, and desiliconization is performed in the same manner as in the above hot metal ladle.
【００１１】溶銑鍋で本発明方法を実施したところ、脱
珪酸素効率は従来法では４０〜７０％であったが、本発
明方法の実施により９０〜１００％に向上した。また、
従来法ではフォーミングの発生により、受銑量を鍋容量
の６０〜７０％に制限しなければならなかったが、本発
明方法の実施により、受銑量を鍋容量の９０〜１００％
にすることができた。When the method of the present invention was carried out in a hot metal ladle, the desiliconization oxygen efficiency was 40 to 70% in the conventional method, but was improved to 90 to 100% by the method of the present invention. Also,
In the conventional method, the amount of pig iron received had to be limited to 60 to 70% of the pot capacity due to the occurrence of forming, but by carrying out the method of the present invention, the amount of pig iron received was 90 to 100% of the pot capacity.
I was able to
【００１２】[0012]
【発明の効果】本発明は上記のように構成されているか
ら、脱珪酸素効率を向上させることができる。また、溶
銑鍋等の受銑量を増加することができるという効果が得
られる。Since the present invention is constituted as described above, it is possible to improve the desiliconization oxygen efficiency. Further, the effect that the amount of pig iron received by the hot metal ladle and the like can be increased is obtained.
【図１】溶銑鍋で行なう本発明方法の説明図である。FIG. 1 is an explanatory view of the method of the present invention performed in a hot metal ladle.
【図２】トーピードカーで行なう本発明方法の説明図で
ある。FIG. 2 is an explanatory view of the method of the present invention performed by a torpedo car.
【図３】脱珪反応と脱炭反応の優先評価図である。FIG. 3 is a prioritized evaluation diagram of desiliconization reaction and decarburization reaction.
【符号の説明】 ２ 溶銑鍋 ３ 溶銑 ４ 圧力蓋 ５ 圧力空気吹込み管 ６ 空間 ７ ランス ９ 圧力調整弁 １０ トーピード[Explanation of symbols] 2 Hot metal ladle 3 Hot metal 4 Pressure lid 5 Pressure air blowing pipe 6 Space 7 Lance 9 Pressure adjusting valve 10 Torpedo
Claims (1)
なう溶銑の脱珪方法において、高圧下の溶銑に脱珪剤を
吹き込んで脱珪を行なうことを特徴とする溶銑の脱珪方
法。1. A hot metal desiliconizing method in which a desiliconizing agent is added to hot metal to desiliconize the hot metal, wherein desiliconizing is performed by blowing a desiliconizing agent into the hot metal under high pressure. Silicon method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20674691A JPH0551618A (en) | 1991-08-19 | 1991-08-19 | Desiliconizing method for molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20674691A JPH0551618A (en) | 1991-08-19 | 1991-08-19 | Desiliconizing method for molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0551618A true JPH0551618A (en) | 1993-03-02 |
Family
ID=16528414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20674691A Pending JPH0551618A (en) | 1991-08-19 | 1991-08-19 | Desiliconizing method for molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0551618A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62263227A (en) * | 1986-05-09 | 1987-11-16 | ゼネラル・エレクトリツク・カンパニイ | Polyanhydride-siloxane and polyimide-siloxane obtained therefrom |
-
1991
- 1991-08-19 JP JP20674691A patent/JPH0551618A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62263227A (en) * | 1986-05-09 | 1987-11-16 | ゼネラル・エレクトリツク・カンパニイ | Polyanhydride-siloxane and polyimide-siloxane obtained therefrom |
| JPH08208841A (en) * | 1986-05-09 | 1996-08-13 | General Electric Co <Ge> | Polyanhydride siloxane |
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