JPH06279825A - Method and apparatus for desiliconizing and dephosphorizing molten iron - Google Patents
Method and apparatus for desiliconizing and dephosphorizing molten ironInfo
- Publication number
- JPH06279825A JPH06279825A JP6831393A JP6831393A JPH06279825A JP H06279825 A JPH06279825 A JP H06279825A JP 6831393 A JP6831393 A JP 6831393A JP 6831393 A JP6831393 A JP 6831393A JP H06279825 A JPH06279825 A JP H06279825A
- Authority
- JP
- Japan
- Prior art keywords
- lance
- hot metal
- pipe
- powder
- holder
- 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶銑の脱珪、脱燐方法
および装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for desiliconizing and dephosphorizing hot metal.
【０００２】[0002]
【従来の技術】現在では転炉装入前の溶銑に対して予備
脱珪、脱燐および脱硫を施し、転炉では脱炭のみを行う
ことによって精錬工程のトータルコストを低減するプロ
セスが広く普及している。溶銑の予備脱珪、脱燐に際し
ては、トピードカーまたは溶銑鍋に充填した溶銑中に、
ランスを浸漬して酸化鉄を主成分とする固体酸化物（以
下固体酸素と称する）および生石灰等の脱燐剤を消耗式
の浸漬ランスを介して吹き込む方法が多く採用されてき
た。このプロセスの最大の弱点は固体酸素の分解熱およ
び固体酸素や生石灰等の顕熱増により溶銑温度が大幅に
低下し、次工程である転炉での熱余裕度が減少すること
にある。このため近年では、酸素源である酸化鉄の一部
を気体酸素に代替して吹き込むことにより溶銑温度を補
償する方法もとられるようになってきた。2. Description of the Related Art At present, a process for reducing the total cost of the refining process by preliminarily desiliconizing, dephosphorizing and desulfurizing the hot metal before charging the converter and only decarburizing in the converter is widely used. is doing. For preliminary desiliconization and dephosphorization of hot metal, in hot metal filled in a tope car or a hot metal ladle,
A method of immersing a lance and blowing a solid oxide containing iron oxide as a main component (hereinafter referred to as solid oxygen) and a dephosphorizing agent such as quicklime through a consumable immersion lance has been widely adopted. The greatest weakness of this process is that the heat of decomposition of solid oxygen and the increase in sensible heat of solid oxygen, quick lime, etc. significantly lower the hot metal temperature, and the thermal margin in the converter, which is the next step, decreases. For this reason, in recent years, a method of compensating the hot metal temperature by replacing a part of iron oxide, which is an oxygen source, with gaseous oxygen and blowing it in has come to be used.
【０００３】この際、気体酸素が溶銑中の各種成分と反
応する際に生じる酸化反応熱は極めて大きいため、酸素
源として固体酸素のみを用いた場合と同じ吹込方法を採
用したならばランス寿命の大幅な低下はまぬがれず工業
的な適用は困難とされてきた。そこでランス寿命を延長
させることを目的として、二重管ランスを用い、内管よ
り気体酸素、外管より不活性ガスで搬送した固体酸素お
よび生石灰等を吹き込む方法およびランス構造に関する
技術が特公昭61−24451 号公報、特公平２−25406 号公
報、特公平２−55485 号公報等に開示されている。これ
らの方法によれば確かにランス寿命は延長するものの、
ランス構造が複雑になるためランス１本当りのコストは
単管型のものに比べ４〜30倍にも上昇する。またランス
を二重管にすることで必然的にランス径の拡大を余儀な
くされ、その結果ランス重量の大幅な上昇、それに伴う
ランス交換作業の負荷増大といった問題が生じている。At this time, since the heat of oxidation reaction generated when gaseous oxygen reacts with various components in the hot metal is extremely large, if the same blowing method as when only solid oxygen is used as the oxygen source is adopted, the lance life will be shortened. It has been considered difficult to apply it industrially because it cannot avoid a large decrease. Therefore, for the purpose of extending the lance life, a method of blowing gas oxygen from the inner tube and solid oxygen and quick lime carried by inert gas from the outer tube using a double tube lance, and a technology related to the lance structure are disclosed in Japanese Patent Publication 61. -24451, Japanese Patent Publication No. 2-25406, Japanese Patent Publication No. 2-55485. Although these methods certainly extend the lance life,
Since the lance structure is complicated, the cost per lance is 4 to 30 times higher than that of the single tube type. In addition, since the lance is a double pipe, it is inevitably necessary to increase the diameter of the lance, and as a result, there is a problem that the weight of the lance is significantly increased and the load of the lance replacement work is increased accordingly.
【０００４】また、固体酸素と生石灰を浸漬ランスより
吹き込むとともに気体酸素を浴表面に吹き付け、主とし
て浴中から発生するCOガスの二次燃焼により溶銑温度の
補償を図る方法も知られている。この方法では浸漬ラン
スの溶損の問題はないが、トピードカー等の炉口耐火物
の損耗が著しい、あるいは操業中のスプラッシュの発生
が激しいといった問題があった。A method is also known in which solid oxygen and quick lime are blown from a dipping lance and gaseous oxygen is blown to the surface of the bath to mainly compensate for the hot metal temperature by secondary combustion of CO gas generated from the bath. This method has no problem of melting damage of the immersion lance, but there is a problem of significant wear of the furnace-mouth refractory such as a toped car or the occurrence of splash during operation.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、前記
問題点を解決し、ランスコストが安価で、かつ作業負荷
の少ない単管ランスの長所を生かしつつ、工業的に適用
可能なランス寿命を確保して固体酸素の気体酸素への代
替による溶銑の温度補償を可能とする技術を提供するこ
とである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to take advantage of the single pipe lance which has a low lance cost and a small work load, and which is industrially applicable to a lance life. It is an object of the present invention to provide a technique for ensuring temperature compensation of hot metal by replacing solid oxygen with gaseous oxygen.
【０００６】[0006]
【課題を解決するための手段】すなわち本発明は、溶銑
中に酸化鉄を主成分とする固体酸化物および生石灰等の
脱燐剤からなる粉体を不活性ガス又は空気で搬送して吹
き込むと同時に気体酸素を吹き込んで溶銑の脱珪、脱燐
を行うに際して、浸漬ランスをランスホルダーで把持
し、該ランスホルダーを内管と外管とからなる二重管と
し、それぞれの上端部近傍において互いに独立した酸素
吹込用配管および粉体吹込用配管と接続し、該内管の下
端を該浸漬ランス内で又は該ランスホルダー内で開口さ
せ、不活性ガス又は空気で搬送された前記の粉体と気体
酸素を予め、該浸漬ランス内又は該ランスホルダー内で
混合してから溶銑中に吹き込むことを特徴とする溶銑の
脱珪、脱燐方法であり、望ましくは、混合する粉体の供
給速度Ｑflux（kg／min ）と気体酸素の供給速度ＱO
2（Nm3 ／min ）の比、Ｑflux／ＱO2を６以上とするも
のであり、また、本発明は、溶銑中に酸化鉄を主成分と
する固体酸化物および生石灰等の脱燐剤からなる粉体を
不活性ガス又は空気で搬送して吹き込むと同時に気体酸
素を吹き込むランス吹込装置において、浸漬ランスをラ
ンスホルダーで把持し、該ランスホルダーを内管と外管
からなる二重管とし、それぞれの上端部近傍において互
いに独立した酸素吹込用配管および粉体吹込用配管に接
続したことを特徴とする溶銑の脱珪、脱燐装置であり、
本発明において、前記の内管と外管からなるランスホル
ダーの該内管の下端部が浸漬ランス内において開口して
いてもよく、また、該内管の下端部が該ランスホルダー
内において開口していてもよい。Means for Solving the Problems That is, according to the present invention, when a powder comprising a solid oxide containing iron oxide as a main component and a dephosphorizing agent such as quick lime is carried into a hot metal by an inert gas or air and blown therein. At the same time, when degassing and dephosphorizing the hot metal by blowing gaseous oxygen, the immersion lance is held by a lance holder, and the lance holder is made into a double pipe consisting of an inner pipe and an outer pipe. The powder which is connected to an independent oxygen blowing pipe and powder blowing pipe, the lower end of the inner pipe is opened in the immersion lance or in the lance holder, and is conveyed by an inert gas or air. A method for desiliconizing and dephosphorizing hot metal, characterized in that gaseous oxygen is previously mixed in the immersion lance or in the lance holder and then blown into the hot metal. Desirably, a feeding rate Qflux of powder to be mixed is used. (Kg / min ) And gaseous oxygen supply rate QO
The ratio of 2 (Nm 3 / min) and Qflux / QO 2 are 6 or more. Further, the present invention relates to a solid oxide containing iron oxide as a main component in a hot metal and a dephosphorizing agent such as quick lime. In a lance blowing device that conveys the powder by an inert gas or air and blows gaseous oxygen at the same time, the immersion lance is held by a lance holder, and the lance holder is a double pipe consisting of an inner pipe and an outer pipe, A hot metal desiliconization and dephosphorization device characterized in that it is connected to an oxygen blowing pipe and a powder blowing pipe that are independent of each other in the vicinity of the upper end of each.
In the present invention, the lower end of the inner pipe of the lance holder consisting of the inner pipe and the outer pipe may be opened in the immersion lance, and the lower end of the inner pipe may be opened in the lance holder. May be.
【０００７】[0007]
【作用】以下、図１乃至図４を用い、本発明について説
明する。図１及び図３はトピードカーに充填された溶銑
へ気体酸素と固体酸素および生石灰等からなる粉体を吹
き込む場合に本発明を適用した様子を模式的に示したも
のである。粉体切出装置１内に払出された固体酸素２お
よび同様に粉体切出装置３内に払出された生石灰を主成
分とする脱燐剤４は、粉体吹込ライン５内を空気あるい
は窒素により搬送され、ランスホルダー７の内管へと供
給される。一方気体酸素は、酸素用配管６より７の外管
へと供給される。このようにして別個に供給された粉体
と気体酸素はランスホルダー７の下流部分乃至浸漬ラン
ス８内で混合された後、単管の浸漬ランス８を通じてト
ピードカー９に充填された溶銑10へ吹き込まれる。The present invention will be described below with reference to FIGS. FIG. 1 and FIG. 3 schematically show how the present invention is applied to the case where a powder made of gaseous oxygen, solid oxygen, quick lime, etc. is blown into the hot metal filled in a tope car. The solid oxygen 2 discharged into the powder cutting device 1 and the dephosphorizing agent 4 mainly containing quick lime discharged into the powder cutting device 3 are used as air or nitrogen in the powder blowing line 5. And is supplied to the inner pipe of the lance holder 7. On the other hand, gaseous oxygen is supplied from the oxygen pipe 6 to the outer pipe 7. The powder and the gaseous oxygen thus separately supplied are mixed in the downstream portion of the lance holder 7 or the immersion lance 8 and then blown into the molten pig iron 10 filled in the tope car 9 through the single pipe immersion lance 8. .
【０００８】ランスホルダーの構造例として、その拡大
図を図２および図４に示す。粉体は空気、窒素等に搬送
されて粉体導入管11からそれに接続されたランスホルダ
ー内管12へと供給される。一方気体酸素は、酸素導入用
のＴ字管13よりランスホルダー内管12とランスホルダー
外管14の間隙を通じて供給される。ここでランスホルダ
ー内管12は外管14よりも図２のように長い管で構成さ
れ、内管12の先端は浸漬ランス８内に突出した構造とな
り、粉体と気体酸素が浸漬ランス８内で混合されるか、
又は図４のように内管12は外管14よりも、短い管で構成
され、内管12が外管14内に開口して外管14のみの単管と
なった部分で粉体と気体酸素が混合される。このように
して混合された粉体と気体酸素はランスホルダーの外管
14と単管型の浸漬ランス８の接続部15を通じて少なくと
も浸漬ランス８内へ供給される。上記の例では粉体がラ
ンスホルダーの内管を、気体酸素が外管を通じて供給さ
れる例を示したが、本発明はこれに限るものではなく、
この構成が逆であっても特に問題とはならない。この点
に関しては既設の配管等の取合いから任意に定められる
ものと考えられる。An enlarged view of an example of the structure of the lance holder is shown in FIGS. 2 and 4. The powder is conveyed to air, nitrogen or the like and supplied from the powder introduction pipe 11 to the lance holder inner pipe 12 connected thereto. On the other hand, gaseous oxygen is supplied from the T-shaped tube 13 for introducing oxygen through the gap between the lance holder inner tube 12 and the lance holder outer tube 14. Here, the inner tube 12 of the lance holder is constituted by a tube longer than the outer tube 14 as shown in FIG. 2, and the tip of the inner tube 12 has a structure projecting into the immersion lance 8 so that powder and gaseous oxygen are contained in the immersion lance 8. Mixed in
Alternatively, as shown in FIG. 4, the inner tube 12 is formed of a tube shorter than the outer tube 14, and the powder and gas are formed in a portion where the inner tube 12 opens into the outer tube 14 and only the outer tube 14 becomes a single tube. Oxygen is mixed. The powder and gaseous oxygen mixed in this way are placed in the outer tube of the lance holder.
It is supplied at least into the immersion lance 8 through a connection portion 15 between the immersion lance 8 and the single tube type immersion lance 8. In the above example, the powder has shown an example in which the inner tube of the lance holder is supplied with gaseous oxygen through the outer tube, but the present invention is not limited to this.
There is no particular problem even if this configuration is reversed. It is considered that this point can be arbitrarily set in consideration of the existing piping.
【０００９】ところで、前述したように粉体と気体酸素
を混合して搬送した場合、配管の火災、爆発事故を引起
こす危険性が高くなることが指摘されてきた。そのため
もあって従来は二重管構造の浸漬ランスが用いられてき
たわけであるが、本発明者らは過去の酸素配管における
事故例、文献を詳細に調査するとともに、実験室規模の
実験を行うことにより、粉体と気体酸素の混合部がラン
スホルダー以降であれば、浸漬ランスが単管であって
も、配管火災、爆発事故の危険性は二重管ランスを用い
た場合と変わりがないことを明らかにした。By the way, it has been pointed out that when powder and gaseous oxygen are mixed and conveyed as described above, there is a high risk of causing a fire or an explosion accident in the piping. For that reason, the immersion lance having a double-pipe structure has been used in the past, but the inventors of the present invention have investigated in detail the past accident examples in oxygen piping and literatures, and conducted laboratory-scale experiments. Therefore, if the mixing part of powder and gaseous oxygen is after the lance holder, even if the immersion lance is a single pipe, the risk of pipe fire and explosion is the same as when using the double pipe lance. It revealed that.
【００１０】すなわち配管火災、爆発となる起点は、
１）配管の曲がり部等、粉体が管壁に激しく衝突する部
位、２）配管内に流れの死所が形成された際に、その部
分に管の摩耗等で発生した鉄粉などの可燃物が滞積した
場合、３）管内に油分や可燃性の洗浄剤が多量に付着し
た場合、４）可燃性のガスケットを用いた場合に帰着す
ることがわかった。That is, the starting point for a pipe fire or explosion is
1) Where the powder collides violently with the wall of the pipe, such as a bent portion of the pipe, 2) When a dead place of the flow is formed in the pipe, flammable iron powder or the like is generated due to wear of the pipe It has been found that the accumulation results in 3) when a large amount of oil or flammable cleaning agent adheres in the pipe, and 4) when a flammable gasket is used.
【００１１】従って本発明のように上記の４つの要因を
回避すれば、浸漬ランスが単管構造であっても全て問題
は解決される。なお、さらに万全を期すためには、ラン
スホルダー構造も含めて、粉体の搬送系路はできる限り
直線状にするとともに、ランスホルダーおよびランスを
構成する材料には何らかの表面硬化処理を施すことが望
ましい。Therefore, if the above four factors are avoided as in the present invention, all the problems can be solved even if the immersion lance has a single pipe structure. For the sake of completeness, the powder conveying system path including the lance holder structure should be as linear as possible, and the surface of the lance holder and the material forming the lance should be some kind of surface hardening treatment. desirable.
【００１２】またランスホルダー内管12の浸漬ランス８
内への突出長さに関しては、特別規定するものではない
が、浸漬ランスが消耗した際に、ランスホルダー内管が
溶銑に直接接触することのないよう、ランスを最下限に
まで浸漬させた場合に、浴表面より上部に位置するもの
であれば良い。また、ランスホルダー外管の形状に関し
ては先端の径を若干絞った例を示したが、この点も特に
規定されるものではなく、操業条件に応じて必要量の気
体酸素および粉体の供給速度が確保できるよう、任意に
設計すれば良い。Further, the immersion lance 8 of the inner tube 12 of the lance holder
There is no special provision for the length of protrusion inside, but when the lance holder is immersed to the minimum limit so that the inner tube of the lance holder does not come into direct contact with the hot metal when the lance is exhausted. In addition, it is sufficient if it is located above the bath surface. Also, regarding the shape of the outer tube of the lance holder, an example in which the diameter of the tip was slightly narrowed was shown, but this point is not particularly specified either, and the supply rate of the required amount of gaseous oxygen and powder according to the operating conditions. It can be designed arbitrarily so that
【００１３】また一方ランスホルダー内管のホルダー内
での長さに関しても特別規定するものではないが、別個
に供給された粉体および気体酸素がそれぞれランスホル
ダー内外管で下流方向へ整流されるに充分な距離だけを
最低確保すれば良い。ランスホルダーの形状について
は、先端の径をランス径と同等程度まで絞った例を示し
たが、この点も特別に規定されるものではなく、操業条
件に応じて必要量の気体酸素および供給速度が確保でき
るよう任意に設計すれば良い。On the other hand, the length of the lance holder inner tube in the holder is not specified, but the powder and gaseous oxygen supplied separately are rectified in the lance holder inner and outer tubes in the downstream direction. It is only necessary to secure at least a sufficient distance. Regarding the shape of the lance holder, an example in which the diameter of the tip is narrowed to the same extent as the lance diameter is shown, but this point is not specially specified either, and the required amount of gaseous oxygen and the supply rate are set according to the operating conditions. It may be designed arbitrarily so that
【００１４】さてこのようにして混合された気体酸素と
粉体は単管の浸漬ランスを通じて溶銑中に吹き込まれる
わけであるが、前述したように、従来単管ランスで気体
酸素を吹き込む場合、ランスの溶損が著しく工業的に成
り立たないとされてきた。しかしながら、本発明者らは
一方で、固体酸素の分解熱および固体酸素と生石灰等の
脱燐材の顕熱増が、ランス出口近傍の冷却効果を有し、
結果的にランスの溶損を抑制することに着目した。具体
的なデータは後に示すが、結論としては固体酸素および
生石灰等の脱燐剤からなる粉体と、気体酸素について、
それぞれの供給速度の比Ｑflux／ＱO2を望ましくは６以
上とすれば、単管ランスにおいても、工業的に成立可能
な程度にまでランスの溶損が抑制できることを見出し
た。The gaseous oxygen and the powder thus mixed are blown into the hot metal through the immersion lance of the single tube. As described above, when the gaseous oxygen is blown by the conventional single tube lance, the lance is used. It has been said that the melting loss of the above is not industrially viable. However, on the other hand, the present inventors have found that the heat of decomposition of solid oxygen and the increase in sensible heat of solid oxygen and dephosphorizing materials such as quick lime have a cooling effect in the vicinity of the lance outlet,
As a result, we focused on suppressing the melting loss of the lance. Although concrete data will be shown later, in conclusion, regarding powders made of solid oxygen and dephosphorizing agents such as quick lime and gaseous oxygen,
It has been found that if the ratio Qflux / QO 2 of the respective supply rates is desirably set to 6 or more, even in the single pipe lance, the melting loss of the lance can be suppressed to an industrially feasible degree.
【００１５】以上本発明についてトピードカーに充填さ
れた溶銑に斜め向きにランスを浸漬した場合を示した
が、容器はトピードカーに限るものではなく溶銑鍋等の
ものでも良く、ランスの浸漬角度も斜めに限るものでは
ない。以下、実施例に基づいて本発明をより詳細に説明
する。Although the present invention has been described with respect to the case where the lance is immersed obliquely in the hot metal filled in the tope car, the container is not limited to the tope car and may be a hot metal pot or the like, and the immersion angle of the lance is also oblique. It is not limited. Hereinafter, the present invention will be described in more detail based on examples.
【００１６】[0016]
実施例１ 装置の構成は図１および図２に示したものと基本的に同
一である。また比較例として二重管ランスを用いた実験
も行った。比較例における装置の概略図を図７に示す。
この例においては、ランスホルダーは全区間二重管とな
っており、ランスホルダーの内管に同径の鋼管を、外管
に外表面を耐火皮覆した鋼管をそれぞれ接続し全区間二
重管の浸漬ランスを構成した。なお、ここでは前述の二
重管ランスを用いた従来技術に従い、外管より粉体を、
内管より気体酸素を供給した。Example 1 The configuration of the device is basically the same as that shown in FIGS. As a comparative example, an experiment using a double tube lance was also conducted. A schematic diagram of the device in the comparative example is shown in FIG.
In this example, the lance holder is a full-section double pipe, and a steel pipe of the same diameter is connected to the inner pipe of the lance holder and a steel pipe whose outer surface is covered with fireproof skin is connected to the outer pipe. Of the immersion lance. In addition, here, according to the prior art using the above-mentioned double tube lance, the powder from the outer tube,
Gaseous oxygen was supplied from the inner tube.
【００１７】表１に実施例および比較例におけるランス
の諸元を示す。なお比較例のランス径等は実施例におけ
る装置と同等の吹込条件が得られるよう設計した。実施
例および比較例における標準的な操業条件を表２に示
す。この条件で操業した場合のランス寿命、ランスコス
トおよびランス交換時間の比較を表３に示す。実施例１
の場合、ランス寿命は若干短くなるものの、１本当りの
コストが安いため、処理に要するランスコストは半減す
る。また構造が簡単かつランス重量が軽いため、ランス
交換作業が容易となり交換時間は約１／４で済むことが
わかる。さらに図５には実施例１および比較例における
脱珪外脱燐酸素効率と溶銑中燐濃度の関係を示す。Table 1 shows the specifications of the lance in Examples and Comparative Examples. The lance diameter and the like of the comparative example were designed so that blowing conditions equivalent to those of the device in the example were obtained. Table 2 shows standard operating conditions in Examples and Comparative Examples. Table 3 shows a comparison of the lance life, lance cost, and lance replacement time when operating under these conditions. Example 1
In the case of 1, the lance life is slightly shortened, but the cost per piece is low, so the lance cost required for processing is halved. Also, since the structure is simple and the lance weight is light, the lance replacement work is easy and the replacement time is about 1/4. Furthermore, FIG. 5 shows the relationship between the desiliconization-external dephosphorization oxygen efficiency and the phosphorus concentration in the hot metal in Example 1 and the comparative example.
【００１８】実施例１では、比較例に比べて５％程度脱
燐効率が向上することがわかる。一般的に脱燐反応効率
の向上には、反応サイトに生石灰等の脱燐剤と酸素源を
共存させることが重要とされている。従って実施例１の
場合、ランスホルダーおよびランス内で気体酸素と粉体
が充分に混合された状況で吹き込まれたため、反応効率
が向上したものと考えられる。It can be seen that in Example 1, the dephosphorization efficiency is improved by about 5% as compared with the comparative example. Generally, in order to improve the efficiency of the dephosphorization reaction, it is important to make a dephosphorizing agent such as quick lime coexist with an oxygen source at the reaction site. Therefore, in the case of Example 1, it is considered that the reaction efficiency was improved because the gaseous oxygen and the powder were blown in the lance holder and the lance in a sufficiently mixed state.
【００１９】前述したように本発明の方法によるランス
寿命の確保は、固体酸素の分解熱および固体酸素と生石
灰等の脱燐剤の顕熱増に伴うランス出口近傍の冷却効果
に共存するものである。本発明者らは前記の操業条件を
基準として気体酸素および粉体の供給速度を様々に変化
させて、ランス溶損状況を詳細に調査した。その結果、
図６に示すようにランスの溶損速度は、粉体と気体酸素
の供給速度の比により、良く整理されることがわかっ
た。As described above, the securing of the lance life by the method of the present invention coexists with the heat of decomposition of solid oxygen and the cooling effect in the vicinity of the lance outlet due to the increase in sensible heat of solid oxygen and a dephosphorizing agent such as quicklime. is there. The present inventors have made detailed investigations on the lance dissolution damage condition by varying the supply rates of gaseous oxygen and powder on the basis of the above operating conditions. as a result,
As shown in FIG. 6, it was found that the dissolution rate of the lance was well organized by the ratio of the supply rate of the powder to the gaseous oxygen.
【００２０】本発明が工業的に成立するためには、望ま
しくは１本のランスで少なくとも１回の処理をまかなう
必要がある。一方、一般的な脱珪・脱燐処理時間が10〜
30分、その際のランスの浸漬深さが1000〜1500mmである
ことを考慮すれば、ランスの溶損速度を最大50mm／min
程度に抑える必要がある。図６に示した関係からランス
溶損速度を50mm／min 以下に抑えるためには、粉体と気
体酸素の供給速度の比を６以上に設定することが望まし
い。In order for the present invention to be industrially feasible, it is necessary to perform at least one treatment with one lance. On the other hand, general desiliconization / dephosphorization treatment time is 10 ~
Taking into account that the immersion depth of the lance at that time is 1000 to 1500 mm for 30 minutes, the melting rate of the lance is up to 50 mm / min.
It is necessary to suppress it to a certain degree. From the relationship shown in FIG. 6, in order to suppress the lance dissolution loss rate to 50 mm / min or less, it is desirable to set the ratio of the powder and gaseous oxygen supply rates to 6 or more.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【表３】 [Table 3]
【００２４】実施例２ 装置の構成は図３および図４に示したものと基本的に同
一である。表１に実施例２におけるランスの諸元を示
す。実施例２における標準的な操業条件は実施例１およ
び前述の比較例と同様表２に示す条件を採用した。この
条件で操業した場合のランス寿命、ランスコストおよび
ランス交換時間の比較を表３に示す。実施例２の場合、
ランス寿命は若干短くなるものの、１本当りのコストが
安いため、処理に要するランスコストは半分以下とな
る。また構造が簡単かつランス重量が軽いため、ランス
交換作業が容易となり交換時間は約１／５で済むことが
わかる。さらに図５には実施例２および前述の比較例に
おける脱珪外脱燐酸素効率と溶銑中燐濃度の関係を示
す。Embodiment 2 The structure of the apparatus is basically the same as that shown in FIGS. Table 1 shows the specifications of the lance in Example 2. As the standard operating conditions in Example 2, the conditions shown in Table 2 were adopted as in Example 1 and the above-mentioned comparative example. Table 3 shows a comparison of the lance life, lance cost, and lance replacement time when operating under these conditions. In the case of Example 2,
Although the lance life is slightly shortened, the cost per piece is low, so the lance cost required for processing is less than half. Also, since the structure is simple and the lance weight is light, the lance replacement work is easy and the replacement time is about 1/5. Further, FIG. 5 shows the relationship between the desiliconization-external dephosphorization oxygen efficiency and the phosphorus concentration in the hot metal in Example 2 and the comparative example.
【００２５】実施例２では、比較例に比べて５％程度脱
燐効率が向上することがわかる。一般に脱燐反応効率の
向上には、反応サイトに生石灰等の脱燐剤と酸素源を共
存させることが重要とされている。従って実施例の場
合、ランスホルダーおよびランス内で気体酸素と粉体が
充分に混合された状況で吹き込まれたため、反応効率が
向上したものと考えられる。It can be seen that in Example 2, the dephosphorization efficiency is improved by about 5% as compared with the comparative example. Generally, in order to improve the efficiency of the dephosphorization reaction, it is important to coexist a dephosphorization agent such as quick lime with an oxygen source at the reaction site. Therefore, in the case of the example, it is considered that the reaction efficiency was improved because the gaseous oxygen and the powder were blown in the lance holder and the lance in a sufficiently mixed state.
【００２６】前述したように本発明の方法によるランス
寿命の確保は、固体酸素の分解熱および固体酸素と生石
灰等の脱燐剤の顕熱増に伴うランス出口近傍の冷却効果
に依存するものである。本発明者らは前記の操業条件を
基準として気体酸素および粉体の供給速度を様々に変化
させて、ランス溶損状況を詳細に調査した。その結果、
実施例１の場合と同様に図６に示す様にランスの溶損速
度は、粉体と気体酸素の供給速度の比により良く整理さ
れることがわかった。As described above, the securing of the lance life by the method of the present invention depends on the heat of decomposition of solid oxygen and the cooling effect in the vicinity of the lance outlet due to the increase in sensible heat of solid oxygen and a dephosphorizing agent such as quicklime. is there. The present inventors have made detailed investigations on the lance dissolution damage condition by varying the supply rates of gaseous oxygen and powder on the basis of the above operating conditions. as a result,
As in the case of Example 1, it was found that the dissolution rate of the lance is well organized by the ratio of the powder and gaseous oxygen supply rates as shown in FIG.
【００２７】本発明が工業的に成立するためには望まし
くは１本のランスで少なくとも１回の処理をまかなう必
要がある。一方、一般的な脱珪・脱燐処理時間が10〜30
分、その際のランスの浸漬深さが1000〜1500mmであるこ
とを考慮すれば、ランスの溶損速度を最大50mm／min 程
度に抑える必要がある。図６に示した関係から、ランス
溶損速度を50mm／min 以下に抑えるためには、粉体と気
体酸素の供給速度の比を６以上に設定することが望まし
い。In order for the present invention to be industrially feasible, it is necessary to perform at least one treatment with one lance. On the other hand, general desiliconization / phosphorus removal processing time is 10 to 30
In consideration of the fact that the immersion depth of the lance at that time is 1000 to 1500 mm, it is necessary to suppress the melt loss rate of the lance to a maximum of about 50 mm / min. From the relationship shown in FIG. 6, in order to suppress the lance dissolution loss rate to 50 mm / min or less, it is desirable to set the ratio of the powder and gaseous oxygen supply rates to 6 or more.
【００２８】[0028]
【発明の効果】本発明は、固体酸素および生石灰等の脱
燐剤からなる粉体と気体酸素を独立にそれぞれ二重管か
らなるランスホルダーで搬送し、浸漬ランス内又はラン
スホルダー内で混合し、単管の浸漬ランスから溶銑中に
吹き込んで脱珪・脱燐を行うもので、望ましくは粉体と
気体酸素の供給速度の比を６以上とすることにより、工
業的に成立可能な程度にまでランスの溶損を抑えること
ができ、しかも従来の二重管方式のランスを用いた場合
に比べて大幅なランスコストの削減およびランス交換作
業負荷の低減が可能となった。Industrial Applicability According to the present invention, powder composed of solid oxygen and dephosphorizing agent such as quick lime and gaseous oxygen are independently conveyed by lance holders composed of double pipes and mixed in an immersion lance or a lance holder. , It is a method of desiliconizing and dephosphorizing by blowing it into the hot metal from the immersion lance of a single pipe. Desirably, by setting the ratio of powder and gaseous oxygen supply rate to 6 or more, it can be industrially established. It is possible to suppress the melting loss of the lance, and it is possible to significantly reduce the lance cost and the work load of replacing the lance as compared with the case of using the conventional double pipe type lance.
【００２９】また、気体酸素と粉体との混合が良好なた
め、脱燐反応効率が向上するという効果も有する。Further, since the mixing of the gaseous oxygen and the powder is good, there is an effect that the dephosphorization reaction efficiency is improved.
【図１】本発明の１装置構成を示す概念図である。FIG. 1 is a conceptual diagram showing one device configuration of the present invention.
【図２】本発明におけるランスホルダーの１構造を示す
断面図である。FIG. 2 is a sectional view showing one structure of a lance holder according to the present invention.
【図３】本発明の１装置構成を示す概念図である。FIG. 3 is a conceptual diagram showing one device configuration of the present invention.
【図４】本発明におけるランスホルダーの１構造を示す
断面図である。FIG. 4 is a sectional view showing one structure of a lance holder according to the present invention.
【図５】実施例および比較例における脱珪外脱燐酸素効
率と溶銑中燐濃度の関係を示すグラフである。FIG. 5 is a graph showing a relationship between a desiliconization-external dephosphorization oxygen efficiency and a phosphorus concentration in hot metal in Examples and Comparative Examples.
【図６】本発明におけるランス溶損速度と、気体酸素の
供給速度に対する粉体の供給速度の比の関係を示すグラ
フである。FIG. 6 is a graph showing the relationship between the lance dissolution rate and the ratio of the powder supply rate to the gaseous oxygen supply rate in the present invention.
【図７】比較例の装置構成を示す概念図である。FIG. 7 is a conceptual diagram showing a device configuration of a comparative example.
１ 粉体切出装置 ２ 固体酸素 ３ 粉体切出装置 ４ 脱燐剤 ５ 粉体吹込用配管 ６ 気体酸素用配管 ７ ランスホルダー ８ 浸漬ランス ９ トピードカー 10 溶銑 11 粉体導入管 12 ランスホルダー内管 13 気体酸素導入用Ｔ字管 14 ランスホルダー外管 15 ランス接続部 1 Powder cutting device 2 Solid oxygen 3 Powder cutting device 4 Dephosphorizing agent 5 Powder injection pipe 6 Gas oxygen pipe 7 Lance holder 8 Immersion lance 9 Toped car 10 Hot metal 11 Powder introduction pipe 12 Lance holder inner pipe 13 T-shaped tube for introducing gaseous oxygen 14 Lance holder outer tube 15 Lance connection part
Claims (6)
物および生石灰等の脱燐剤からなる粉体を不活性ガス又
は空気で搬送して吹き込むと同時に気体酸素を吹き込ん
で溶銑の脱珪、脱燐を行うに際して、浸漬ランスをラン
スホルダーで把持し、該ランスホルダーを内管と外管と
からなる二重管とし、それぞれの上端部近傍において互
いに独立した酸素吹込用配管および粉体吹込用配管と接
続し、該内管の下端を該浸漬ランス内で開口させ、不活
性ガス又は空気で搬送された前記の粉体と気体酸素を予
め、該浸漬ランス内で混合してから溶銑中に吹き込むこ
とを特徴とする溶銑の脱珪、脱燐方法。1. A hot metal is deoxidized by carrying a powder of a solid oxide containing iron oxide as a main component and a dephosphorizing agent such as quick lime by an inert gas or air and blowing the same at the same time by blowing gaseous oxygen into the hot metal. When carrying out silicidation and dephosphorization, the immersion lance is held by a lance holder, and the lance holder is made into a double pipe consisting of an inner pipe and an outer pipe. It is connected to a blowing pipe, the lower end of the inner pipe is opened in the immersion lance, and the powder and gaseous oxygen carried by an inert gas or air are previously mixed in the immersion lance, and then the hot metal is melted. A method for desiliconizing and dephosphorizing hot metal, characterized by being blown into the inside.
物および生石灰等の脱燐剤からなる粉体を不活性ガス又
は空気で搬送して吹き込むと同時に気体酸素を吹き込ん
で溶銑の脱珪、脱燐を行うに際して、浸漬ランスをラン
スホルダーで把持し、該ランスホルダーを内管と外管と
からなる二重管とし、それぞれの上端部近傍において互
いに独立した酸素吹込用配管および粉体吹込用配管と接
続し、該内管の下端を該ランスホルダーに開口させ、不
活性ガス又は空気で搬送された前記の粉体と気体酸素を
予め、該ランスホルダー内で混合してから溶銑中に吹き
込むことを特徴とする脱珪、脱燐方法。2. A hot metal powder containing a solid oxide containing iron oxide as a main component and a dephosphorizing agent such as quicklime is fed by an inert gas or air and blown therein, and at the same time gaseous oxygen is blown to remove the hot metal. When carrying out silicidation and dephosphorization, the immersion lance is held by a lance holder, and the lance holder is made into a double pipe consisting of an inner pipe and an outer pipe. It is connected to a blowing pipe, the lower end of the inner pipe is opened to the lance holder, and the powder and gaseous oxygen carried by an inert gas or air are mixed in advance in the lance holder and then in the hot metal. A method of desiliconizing and dephosphorizing, characterized in that it is blown into.
n ）と気体酸素の供給速度ＱO2（Nm3 ／min ）の比、Ｑ
flux／ＱO2を６以上とすることを特徴とする請求項１又
は２記載の溶銑の脱珪、脱燐方法。3. The feed rate of the powder to be mixed Qflux (kg / mi
n) and the supply rate of gaseous oxygen QO 2 (Nm 3 / min), Q
The method for desiliconizing and dephosphorizing hot metal according to claim 1 or 2, wherein the flux / QO 2 is 6 or more.
物および生石灰等の脱燐剤からなる粉体を不活性ガス又
は空気で搬送して吹き込むと同時に気体酸素を吹き込む
ランス吹込装置において、浸漬ランスをランスホルダー
で把持し、該ランスホルダーを内管と外管からなる二重
管とし、それぞれの上端部近傍において互いに独立した
酸素吹込用配管および粉体吹込用配管に接続したことを
特徴とする溶銑の脱珪、脱燐装置。4. A lance blowing device in which a powder of a solid oxide containing iron oxide as a main component and a dephosphorizing agent such as quick lime is carried into the hot metal by an inert gas or air to blow the powder and at the same time, gaseous oxygen is blown. , Holding the immersion lance with a lance holder, making the lance holder into a double pipe consisting of an inner pipe and an outer pipe, and connecting the lance holder to independent oxygen blowing pipes and powder blowing pipes in the vicinity of the upper end of each. Characteristic hot metal desiliconization and dephosphorization equipment.
内管の下端部が浸漬ランス内において開口していること
を特徴とする請求項４記載の溶銑の脱珪、脱燐装置。5. The apparatus for desiliconizing and dephosphorizing hot metal according to claim 4, wherein the lower end of the inner tube of the lance holder consisting of the inner tube and the outer tube is open in the immersion lance.
内管の下端部が該ランスホルダー内において開口してい
ることを特徴とする請求項４記載の溶銑の脱珪、脱燐装
置。6. The apparatus for desiliconizing and dephosphorizing hot metal according to claim 4, wherein a lower end of the inner tube of the lance holder consisting of the inner tube and the outer tube is open in the lance holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5068313A JP2812852B2 (en) | 1993-03-26 | 1993-03-26 | Hot metal desiliconization and dephosphorization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5068313A JP2812852B2 (en) | 1993-03-26 | 1993-03-26 | Hot metal desiliconization and dephosphorization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06279825A true JPH06279825A (en) | 1994-10-04 |
| JP2812852B2 JP2812852B2 (en) | 1998-10-22 |
Family
ID=13370207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5068313A Expired - Fee Related JP2812852B2 (en) | 1993-03-26 | 1993-03-26 | Hot metal desiliconization and dephosphorization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2812852B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013209737A (en) * | 2011-04-27 | 2013-10-10 | Jfe Steel Corp | Method for producing molten steel |
| CN103540708A (en) * | 2013-10-14 | 2014-01-29 | 北京科技大学 | Molten iron gasification silicon-removing nano-grade SiO2 recovery method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS626608A (en) * | 1985-07-02 | 1987-01-13 | ヤンマー農機株式会社 | Apparatus for automatic control of handling depth |
| JPS62185814A (en) * | 1986-02-10 | 1987-08-14 | Sumitomo Metal Ind Ltd | Lance |
| JPH024113U (en) * | 1988-06-22 | 1990-01-11 |
-
1993
- 1993-03-26 JP JP5068313A patent/JP2812852B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS626608A (en) * | 1985-07-02 | 1987-01-13 | ヤンマー農機株式会社 | Apparatus for automatic control of handling depth |
| JPS62185814A (en) * | 1986-02-10 | 1987-08-14 | Sumitomo Metal Ind Ltd | Lance |
| JPH024113U (en) * | 1988-06-22 | 1990-01-11 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013209737A (en) * | 2011-04-27 | 2013-10-10 | Jfe Steel Corp | Method for producing molten steel |
| CN103540708A (en) * | 2013-10-14 | 2014-01-29 | 北京科技大学 | Molten iron gasification silicon-removing nano-grade SiO2 recovery method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2812852B2 (en) | 1998-10-22 |
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