JP4009029B2 - Gas stirring method for molten metal - Google Patents

Gas stirring method for molten metal Download PDF

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Publication number
JP4009029B2
JP4009029B2 JP00361099A JP361099A JP4009029B2 JP 4009029 B2 JP4009029 B2 JP 4009029B2 JP 00361099 A JP00361099 A JP 00361099A JP 361099 A JP361099 A JP 361099A JP 4009029 B2 JP4009029 B2 JP 4009029B2
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Prior art keywords
dip tube
ladle
molten metal
stirring
diameter
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JP2000204421A (en
Inventor
和宏 松澤
尚近 今村
重範 矢倉
司 柏原
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Nippon Steel Corp
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Nippon Steel Corp
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【０００１】
【発明の属する技術分野】
本発明は、溶融金属の取鍋精錬における溶融金属のガス攪拌方法に関するものである。
【０００２】
【従来の技術】
溶融金属の成分調整方法として、取鍋に収容された溶融金属に浸漬管を浸漬し、浸漬管の下方から攪拌用ガスを吹込みつつ、浸漬管内上方から成分調整用物質を溶融金属内に投入する取鍋精錬法が存在する。溶融金属が溶鋼の場合には、例えば特開平７−１１３１１４号公報に開示される方式が提案されている。
【０００３】
この方法は、図２（ａ）に示すように浸漬管４下方から攪拌用ガス６を吹込むことで形成するプルーム（上昇する気泡領域）の広がりを考慮し、浸漬管４径方向中心と取鍋１径方向中心を一致させると共に攪拌用ガス６吹込み位置を取鍋１径方向中心に対して下記（３）式に示す範囲Ｙだけ偏芯させるものである。
ｈ・ｔａｎ（θ／２）≦Ｙ≦ｄ／２−ｈ・ｔａｎ（θ／２） ・（３）
但し、 ｄ：浸漬管径
【０００４】
この方法は、成分調整と共に浸漬管内を減圧状態にして溶融金属内脱ガス反応を促進させる減圧精錬反応には有効である。即ち図２（ａ）に示すように浸漬管４内を減圧した場合には浸漬管４内の溶融金属２上面が浸漬管４外に比べ上昇するため、この際に浸漬管４内の溶融金属２に上昇流が発生し、さらに浸漬管４下方からの吹込み攪拌ガス６との相乗効果により浸漬管４内では一層大きな溶融金属２上昇流の発生と共に、浸漬管４外への流出する溶融金属２攪拌流７が発生するためである。
また、減圧精錬装置では脱ガス反応を効率よく行うため、浸漬管４内の溶融金属２上面の反応面積を大きくしなければならず、取鍋径ｄに対する浸漬管径Ｄを大きくする必要がある。しかしながら、脱ガス反応効果の少ない常圧下での精錬装置への従来方法の適用は成分調整用物質の攪拌が十分にできない。
【０００５】
即ち、浸漬管内を常圧状態下で、前記特開平７−１１３１１４号公報に示されているように、浸漬管径ｄの取鍋径Ｄに対する比率を高めた場合（前記特開平７−１１３１１４号公報の実施例では浸漬管４断面積に対する浸漬管４内の溶融金属２上面の攪拌プルーム面積の比率を０．０３程度に小さくにした場合）は、図２（ｂ）に示すように、攪拌用ガス６によって生成した上昇流は溶融金属２上面から浸漬管内壁に向かって流動するものの、浸漬管径が大きいため浸漬管内壁に衝突するまでに減速してしまい、その結果衝突後の下降流も更に減速するため、取鍋内溶融金属２全体を攪拌させる流動が得られなくなってしまう。
以上のように、本方法を常圧状態下で適用した場合には、取鍋内溶融金属２全体を均一に混合させるのに時間を要する問題があった。
【０００６】
【発明が解決しようとする課題】
本発明の目的は、常圧下にて溶融金属の成分調整用物質を投入する為の浸漬管を浸漬し、攪拌用ガスによる溶融金属の攪拌を行うに当たり、取鍋内溶融金属全体を効果的に攪拌を生じさせ、均一混合時間を短縮する方法を提供することである。
【０００７】
【課題を解決するための手段】
かかる目的達成の為の手段について、本発明者は、詳細なる検討及び緻密な実験等を繰り返し実施した結果、常圧下にて溶融金属の混合・攪拌が主目的である精錬設備においては、浸漬管径を最小限に抑えつつ、攪拌用ガス吹込み位置を適切に設定することにより、上記の課題が解決可能であることを知見し、本発明を完成させた。
【０００８】
ここに、本発明の要旨とするところは、図１に示すように溶融金属を収容する取鍋中に浸漬管を浸漬させて、浸漬管内に溶融金属の成分調整用物質を投入しつつ取鍋下部の浸漬管下方に設置したノズルから攪拌用ガスを吹込み溶融金属を攪拌しながら取鍋精錬を行うに際して、浸漬管径ｄが下記（４）式の条件を満たし、且つ、攪拌用ガス吹込み位置は浸漬管径方向中心とし、更に、取鍋径方向中心に対する浸漬管径方向中心の偏芯量Ｘが下記（５）式の条件を満たすことを特徴とする溶融金属のガス攪拌方法である。
１．２・２ｈ・ｔａｎ（θ／２）≦ｄ≦２．０・２ｈ・ｔａｎ（θ／２）（４）
ｄ／２≦Ｘ≦Ｄ／２−ｈ・ｔａｎ（θ／２） ．（５）
但し、ｈ：浸漬管下端から攪拌用ガス吹込み深さ
θ：上昇気泡の広がり角
Ｄ：取鍋径
【０００９】
【発明の実施の形態】
次に、本発明の実施の形態について詳細に説明する。尚、以下の例においては、図１を基に溶融金属として溶鋼を例にとって説明する。図１に示すように、取鍋１に収容された溶鋼２中に溶鋼に投入する成分調整用物質３を投入する為の浸漬管４を浸漬させて、取鍋１下部の浸漬管４下に攪拌用ガス吹込みノズル５を設置して、攪拌用ガス６を吹込み溶鋼２を攪拌しながら常圧下にて取鍋精錬を行う。
【００１０】
攪拌用ガス６は溶鋼２内部を上昇しながら、徐々に広がる。この広がり角をθとし、浸漬管４下端から攪拌用ガス吹込みノズル５の吹込み点までの深さをｈとしたとき、浸漬管４下端付近に到達した攪拌ガス６のプルームは、半径ｈ・ｔａｎ（θ／２）の広がりをもつ。即ち、攪拌用ガス６が浸漬管４外へ流出しない為には、浸漬管４径ｄは２ｈ・ｔａｎ（θ／２）以上必要であり、下記（６）式を満足させる必要がある。
２ｈ・ｔａｎ（θ／２）≦ｄ ．（６）
【００１１】
この場合、攪拌用ガス６によって浸漬管４に流入した溶鋼２が、直ちに浸漬管４から流出し、取鍋１内部に下降する溶鋼流７を効果的に生成させるためには、浸漬管４径ｄと浸漬管４下端の高さ位置へ到達した攪拌ガス６のプルーム径とが理想的には同じ値にするべきであり、従って、上記（６）式は下記（７）式となる。
ｄ＝２ｈ・ｔａｎ（θ／２） ．（７）
【００１２】
更に、前述のようにプルームを完全に浸漬管４内に収容しつつ、浸漬管４径を最小とするためには、幾何学的な位置関係の検討から浸漬管４径方向中心部直下に攪拌用ガス６吹込み点を設けることが必要となる。
【００１３】
しかしながら溶鋼流７や攪拌用ガス６流量，圧力及びノズル状態の不安定性によりプルーム径及びプルーム生成位置の変動は避けられない為、結果として、見掛けのプルーム径が拡大し、浸漬管４内にプルームを完全に収容可能とする浸漬管４径ｄを適宜選択する必要がある。そこで、浸漬管４径ｄを変化させ、取鍋１内の溶鋼２に成分調整物質を投入開始から、取鍋１内の溶鋼２に完全に混合するまでの時間τ（以下均一混合時間と称す）を調査した結果、均一混合時間を短くするためには（８）式の範囲とする必要があることが判った。
１．２・２ｈ・ｔａｎ（θ／２）≦ｄ≦２．０・２ｈ・ｔａｎ（θ／２）（８）
【００１４】
次に、取鍋１径方向中心に対する攪拌用ガス吹込みノズル５位置（＝浸漬管４径方向中心）の配置方法について述べる。本発明では、前述の浸漬管４内の混合をも含めた取鍋１内全体の攪拌を効率良く行うため、浸漬管４径方向中心、即ち攪拌ガス吹込みノズル５位置が取鍋１中心に対し偏芯量Ｘで配置する必要がある。これは図３に示すように、攪拌ガス用吹込みノズル５位置を偏芯させた場合は、取鍋１側壁によって浸漬管４から流出する溶鋼流７が取鍋１側壁方向へ分散し難くなり、その結果、取鍋１内全体の一方向環状流が生じ易くなるためである。しかし、図４に示すように偏芯量Ｘを大きくし過ぎると、攪拌ガス６のプルームが取鍋１の側壁に接し、プルームを浸漬管４にて確実に覆うことが出来なくなる。以上の結果から、取鍋１径方向中心に対する攪拌ガス吹込みノズル５位置の偏芯量Ｘは、下記（９）式の範囲にする必要がある。
ｄ／２≦Ｘ≦Ｄ／２−ｈ・ｔａｎ（θ／２） ．（９）
但し、上記（８）式の浸漬管４径ｄの値によって、上記（９）式の範囲内の偏芯量Ｘであっても浸漬管４が取鍋１壁に接触する場合は、浸漬管４が接触しないようなＸの値とする。
【００１５】
以上説明したように、浸漬管４径と攪拌ガス吹込みノズル５位置を一致させ、浸漬管４径ｄ、浸漬管４径ｄ及び取鍋１径Ｄ方向中心に対する攪拌用ガス吹込みノズル５位置（＝浸漬管４径方向中心）の偏芯量Ｘを適正にすることにより、取鍋１内の溶鋼２を効率的に混合・攪拌をすることができる。
尚、図５に示すような攪拌用ガス吹込みノズル５としてランスを用いた際も、吹込み深さが小さくなる為、ポーラスプラグを用いて攪拌用ガスを取鍋１の底から吹込んだ際に比較して攪拌・混合効果は減じられるものの、本発明の効果は同等に得られる。
【００１６】
【実施例】
取鍋径Ｄ＝４７７０ｍｍ，浸漬管下端から攪拌用ガス吹込みノズルとしての取鍋底に設置したポーラスプラグまでの深さｈ＝２５００ｍｍとして３４０ｔのアルミキルド溶鋼を用い、取鍋径方向中心に対する攪拌ガス吹込みノズル位置の偏芯量Ｘ、取鍋径方向中心に対する浸漬管径方向中心の偏芯量Ｙ、さらに浸漬管径ｄを変化させてそれぞれの均一混合時間を調査した結果を表１に示す。尚、本実施に当たっては、攪拌ガスとしてポーラスプラグから上昇気泡の広がり角θ＝２０°、流量＝５００ＮＬ／ｈｒのＡｒの吹込みを行った。
【００１７】
【表１】

Figure 0004009029
【００１８】
実施例１及び２は取鍋径方向中心に対する攪拌ガス吹込みノズル位置の偏芯量Ｘと浸漬管径ｄを適正範囲にし、取鍋径方向中心に対する浸漬管径方向中心の偏芯量Ｙを偏芯量Ｘと一致（Ｘ＝Ｙ）させた例である。従来例１は取鍋径方向中心と浸漬管径方向中心を一致（Ｘ＝０）させた例である。比較例１〜３は偏芯量Ｘ、Ｙ、浸漬管径ｄを本発明の範囲外にした例である。表１より、偏芯量Ｘ、Ｙ、浸漬管径ｄを適正範囲にすることにより均一混合時間を短縮することが可能となった。
【００１９】
【発明の効果】
本発明により、溶融金属を収容する取鍋中に常圧下で溶融金属の成分調整用物を投入する為の浸漬管を浸漬させ、その浸漬管下から攪拌用ガス浸漬管内に流入するように吹込み、溶融金属を攪拌しながら行う取鍋精錬において、取鍋内の良好な攪拌を実現し、均一混合時間の短縮により攪拌用ガスの使用量を大幅に削減することが可能となり、大きな経済効果を享受する事を可能とした。
【図面の簡単な説明】
【図１】本発明の概念図
【図２】従来技術における減圧下と常圧下の差異を示す概念図
【図３】取鍋と浸漬管の相対位置と溶融金属流の模式図
【図４】プルーム、浸漬管、取鍋の相対位置関係
【図５】攪拌用ガス吹込みノズルにランスを用いた際の概念図
【符号の説明】
１．取鍋
２．溶鋼（溶融金属）
３．溶鋼に投入する成分調整用物質
４．浸漬管
５．攪拌用ガス吹込みノズル
６．攪拌用ガス
７．溶鋼流（溶融金属流）
ｄ：浸漬管径
ｈ：浸漬管下端から攪拌用ガス吹込み高さ
θ：上昇気泡の広がり角
Ｄ：取鍋径
Ｘ：取鍋径方向中心に対する攪拌用ガス吹込み位置の偏芯量
Ｙ：取鍋径方向中心に対する浸漬管径方向中心の偏芯量
τ：均一混合時[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molten metal gas stirring method in molten metal ladle refining.
[0002]
[Prior art]
As a component adjustment method for molten metal, immerse the dip tube in the molten metal contained in the ladle, and inject the gas for stirring from the bottom of the dip tube, and put the substance for adjusting the component into the molten metal from above the dip tube. There is a ladle refining method. When the molten metal is molten steel, for example, a method disclosed in Japanese Patent Laid-Open No. 7-113114 has been proposed.
[0003]
In this method, as shown in FIG. 2 (a), considering the spread of the plume (the rising bubble region) formed by blowing the stirring gas 6 from below the dip tube 4, the center of the dip tube 4 in the radial direction is taken into account. The center of the pan 1 diametrical direction is made coincident, and the stirring gas 6 blowing position is decentered by the range Y shown in the following formula (3) with respect to the pan 1 diametrical center.
h · tan (θ / 2) ≦ Y ≦ d / 2−h · tan (θ / 2) (3)
Where d: dip tube diameter
This method is effective for a vacuum refining reaction in which the inside of the dip tube is decompressed and the degassing reaction in the molten metal is promoted together with the component adjustment. That is, as shown in FIG. 2A, when the inside of the dip tube 4 is depressurized, the upper surface of the molten metal 2 in the dip tube 4 rises as compared with the outside of the dip tube 4. As a result, an upward flow is generated in the dip tube 4, and the molten metal 2 rises further in the dip tube 4 due to a synergistic effect with the blown stirring gas 6 from below the dip tube 4, and flows out of the dip tube 4. This is because the metal 2 stirring flow 7 is generated.
Further, in order to efficiently perform the degassing reaction in the vacuum refining apparatus, the reaction area on the upper surface of the molten metal 2 in the dip tube 4 must be increased, and the dip tube diameter D with respect to the ladle diameter d needs to be increased. . However, application of the conventional method to a refining apparatus under normal pressure with little degassing reaction effect cannot sufficiently stir the component adjusting substance.
[0005]
That is, when the ratio of the dip tube diameter d to the ladle diameter D is increased under normal pressure in the dip tube as shown in the above-mentioned JP-A-7-113114 (JP-A-7-113114). In the embodiment of the publication, when the ratio of the stirring plume area of the upper surface of the molten metal 2 in the dip tube 4 to the cross-sectional area of the dip tube 4 is reduced to about 0.03), as shown in FIG. Although the upward flow generated by the working gas 6 flows from the upper surface of the molten metal 2 toward the inner wall of the dip tube, it is decelerated until it collides with the inner wall of the dip tube due to the large diameter of the dip tube. Furthermore, since it further decelerates, the flow which stirs the whole molten metal 2 in a ladle cannot be obtained.
As described above, when this method is applied under normal pressure, there is a problem that it takes time to uniformly mix the entire molten metal 2 in the ladle.
[0006]
[Problems to be solved by the invention]
The purpose of the present invention is to immerse a dip tube for introducing a component for adjusting the composition of molten metal under normal pressure, and to effectively stir the molten metal in a ladle with stirring gas by stirring gas. It is to provide a method for producing agitation and shortening the uniform mixing time.
[0007]
[Means for Solving the Problems]
As a result of repeatedly conducting detailed examinations and detailed experiments on the means for achieving such an object, the present inventor has found that a dip tube is used in a refining facility whose main purpose is mixing and stirring of molten metal under normal pressure. The inventors have found that the above problem can be solved by appropriately setting the stirring gas blowing position while minimizing the diameter, and completed the present invention.
[0008]
Here, the gist of the present invention is that a dip tube is immersed in a ladle containing molten metal as shown in FIG. 1, and a component adjustment material for the molten metal is introduced into the dip tube. When performing ladle refining while agitating gas is blown from a nozzle installed below the lower dip tube while stirring the molten metal, the dip tube diameter d satisfies the condition of the following formula (4) and the stirring gas blown The molten metal gas stirring method is characterized in that the insertion position is the center of the dip tube radial direction, and the eccentric amount X of the dip tube radial direction center with respect to the ladle radial direction center satisfies the following condition (5): is there.
1.2 · 2h · tan (θ / 2) ≦ d ≦ 2.0 · 2h · tan (θ / 2) (4)
d / 2 ≦ X ≦ D / 2−h · tan (θ / 2). (5)
However, h: Stirring gas blowing depth from lower end of dip tube θ: Spreading angle of rising bubble D: Ladle diameter
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail. In the following examples, molten steel is used as an example of molten metal based on FIG. As shown in FIG. 1, a dip tube 4 for introducing a component adjusting substance 3 to be introduced into molten steel is immersed in molten steel 2 accommodated in a ladle 1, and is placed under the dip tube 4 at the bottom of the ladle 1. A stirring gas blowing nozzle 5 is installed, and a ladle smelting is performed under normal pressure while blowing the stirring gas 6 and stirring the molten steel 2.
[0010]
The stirring gas 6 gradually spreads while rising inside the molten steel 2. When the divergence angle is θ and the depth from the lower end of the dip tube 4 to the blowing point of the stirring gas blowing nozzle 5 is h, the plume of the stirring gas 6 reaching the lower end of the dip tube 4 has a radius h. -It has a spread of tan (θ / 2). That is, in order for the stirring gas 6 not to flow out of the dip tube 4, the dip tube 4 diameter d needs to be 2 h · tan (θ / 2) or more, and the following equation (6) needs to be satisfied.
2h · tan (θ / 2) ≦ d. (6)
[0011]
In this case, in order to effectively generate the molten steel flow 7 that the molten steel 2 that has flowed into the dip tube 4 by the stirring gas 6 immediately flows out of the dip tube 4 and descends into the ladle 1, the diameter of the dip tube 4 The plume diameter of the stirring gas 6 that has reached the height position of the lower end of the dip tube 4 should ideally be the same value, and therefore the above equation (6) becomes the following equation (7).
d = 2h · tan (θ / 2). (7)
[0012]
Furthermore, in order to minimize the diameter of the dip tube 4 while accommodating the plume completely in the dip tube 4 as described above, stirring is performed immediately below the central portion in the radial direction of the dip tube 4 in consideration of the geometrical positional relationship. It is necessary to provide a working gas 6 injection point.
[0013]
However, the fluctuation of the plume diameter and the plume generation position is unavoidable due to the instability of the molten steel flow 7 and the stirring gas 6 flow rate, pressure and nozzle state. It is necessary to appropriately select the diameter d of the dip tube 4 that allows the tube to be completely accommodated. Therefore, the time τ (hereinafter referred to as uniform mixing time) from the start of supplying the component adjusting substance to the molten steel 2 in the ladle 1 to the complete mixing with the molten steel 2 in the ladle 1 is changed by changing the diameter d of the dip tube 4. As a result of investigating ()), it was found that the range of the formula (8) is necessary to shorten the uniform mixing time.
1.2 · 2h · tan (θ / 2) ≦ d ≦ 2.0 · 2h · tan (θ / 2) (8)
[0014]
Next, an arrangement method of the position of the stirring gas blowing nozzle 5 with respect to the center of the ladle 1 in the radial direction (= center of the dip tube 4 in the radial direction) will be described. In the present invention, in order to efficiently stir the entire ladle 1 including the mixing in the dip tube 4 described above, the center of the dip tube 4 in the radial direction, that is, the position of the stirring gas blowing nozzle 5 is at the center of the ladle 1. On the other hand, it is necessary to arrange with an eccentric amount X. As shown in FIG. 3, when the position of the stirring gas injection nozzle 5 is eccentric, the molten steel flow 7 flowing out from the dip pipe 4 through the ladle 1 side wall is less likely to be dispersed toward the ladle 1 side wall. As a result, a one-way annular flow in the entire ladle 1 is likely to occur. However, if the eccentric amount X is too large as shown in FIG. 4, the plume of the stirring gas 6 comes into contact with the side wall of the ladle 1 and the plume cannot be reliably covered with the dip tube 4. From the above results, the eccentric amount X of the stirring gas blowing nozzle 5 position with respect to the center of the ladle 1 in the radial direction needs to be in the range of the following formula (9).
d / 2 ≦ X ≦ D / 2−h · tan (θ / 2). (9)
However, if the dip tube 4 is in contact with the ladle 1 wall depending on the value of the dip tube 4 diameter d in the above equation (8), even if the eccentric amount X is in the range of the above equation (9), the dip tube The value of X is such that 4 does not touch.
[0015]
As described above, the diameter of the dip tube 4 and the position of the stirring gas blowing nozzle 5 are matched, and the position of the stirring gas blowing nozzle 5 with respect to the center in the direction of the dip pipe 4 diameter d, the dip tube 4 diameter d, and the ladle 1 diameter D By making the eccentric amount X of (= center of the dip tube 4 radial direction) appropriate, the molten steel 2 in the ladle 1 can be mixed and stirred efficiently.
Even when a lance is used as the stirring gas blowing nozzle 5 as shown in FIG. 5, since the blowing depth becomes small, the stirring gas was blown from the bottom of the pan 1 using a porous plug. Although the stirring / mixing effect is reduced as compared with the case, the effect of the present invention can be obtained equally.
[0016]
【Example】
Ladle diameter D = 4770mm, 340t of aluminum killed molten steel is used as the depth h = 2500mm from the lower end of the dip tube to the porous plug installed at the bottom of the ladle as the stirring gas blowing nozzle, and stirring gas blowing to the center of the ladle radial direction Table 1 shows the results of investigating the respective uniform mixing times by changing the eccentric amount X of the insertion nozzle position, the eccentric amount Y of the dip tube radial direction center with respect to the ladle diametric center, and the dip tube diameter d. In this embodiment, Ar was blown from the porous plug as an agitation gas with a rising bubble spread angle θ = 20 ° and a flow rate = 500 NL / hr.
[0017]
[Table 1]
Figure 0004009029
[0018]
In Examples 1 and 2, the eccentric amount X of the stirring gas blowing nozzle position relative to the ladle diametric center and the dip tube diameter d are within an appropriate range, and the eccentric amount Y of the dip tube radial center relative to the ladle diametric center is set. This is an example in which the eccentricity amount X coincides (X = Y). Conventional Example 1 is an example in which the ladle radial center matches the dip tube radial center (X = 0). Comparative Examples 1 to 3 are examples in which the eccentric amounts X and Y and the dip tube diameter d are out of the scope of the present invention. From Table 1, it became possible to shorten the uniform mixing time by setting the eccentric amounts X and Y and the dip tube diameter d within the proper ranges.
[0019]
【The invention's effect】
According to the present invention, a dip tube for charging a component for adjusting a component of molten metal is immersed in a ladle containing molten metal under normal pressure, and blown so as to flow into the stirring gas dip tube from under the dip tube. In addition, in ladle refining while stirring molten metal, it is possible to achieve good stirring in the ladle and to significantly reduce the amount of stirring gas used by shortening the uniform mixing time. It was possible to enjoy.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of the present invention. FIG. 2 is a conceptual diagram showing the difference between reduced pressure and normal pressure in the prior art. FIG. 3 is a schematic view of a relative position between a ladle and a dip tube and a molten metal flow. Relative positional relationship between plume, dip tube, and ladle [Fig. 5] Conceptual diagram when a lance is used for the stirring gas blowing nozzle [Explanation of symbols]
1. Ladle 2. Molten steel (molten metal)
3. 3. Substance for adjusting the composition to be added to molten steel 4. dip tube 5. Gas blowing nozzle for stirring 6. Gas for stirring Molten steel flow (molten metal flow)
d: Dip tube diameter h: Stirring gas blowing height from bottom of dip tube θ: Spreading angle of rising bubble D: Ladle diameter X: Eccentric amount Y of stirring gas blowing position with respect to ladle radial direction center Y: Eccentric amount τ in the dip tube radial center relative to the ladle diametric center: During uniform mixing

Claims (1)

溶融金属を収容する取鍋中に常圧下で溶融金属の成分調整用物質を投入する為の浸漬管を浸漬させ、その浸漬管下方から攪拌用ガスを浸漬管内に流入するように吹込み、該金属を攪拌しながら取鍋精錬を行うに際して、浸漬管径ｄが下記（１）式の条件を満たし、且つ、前記攪拌用ガス吹込みノズルの位置を前記浸漬管の中心部下方とし、更に、取鍋径方向中心に対しての浸漬管径方向中心の偏芯量Ｘが下記（２）式の条件を満たすことを特徴とする溶融金属のガス攪拌方法。
１．２・２ｈ・ｔａｎ（θ／２）≦ｄ≦２．０・２ｈ・ｔａｎ（θ／２）（１）
ｄ／２≦Ｘ≦Ｄ／２−ｈ・ｔａｎ（θ／２） ．（２）
但し、ｈ：浸漬管下端から攪拌用ガス吹込み深さ
θ：上昇気泡の広がり角
Ｄ：取鍋径In a ladle containing molten metal, immersing a dip tube for charging the material for adjusting the component of the molten metal under normal pressure, and blowing the stirring gas into the dip tube from below the dip tube, When performing ladle refining while stirring the metal, the dip tube diameter d satisfies the condition of the following formula (1), and the position of the stirring gas blowing nozzle is below the center of the dip tube, A molten metal gas stirring method, wherein the eccentric amount X of the dip tube radial direction center with respect to the ladle radial direction center satisfies the following equation (2).
1.2 · 2h · tan (θ / 2) ≦ d ≦ 2.0 · 2h · tan (θ / 2) (1)
d / 2 ≦ X ≦ D / 2−h · tan (θ / 2). (2)
However, h: Stirring gas blowing depth from the lower end of the dip tube θ: Spreading angle of rising bubbles D: Ladle diameter
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