JPS61149416A - Pretreatment of molten pig iron - Google Patents
Pretreatment of molten pig ironInfo
- Publication number
- JPS61149416A JPS61149416A JP27219184A JP27219184A JPS61149416A JP S61149416 A JPS61149416 A JP S61149416A JP 27219184 A JP27219184 A JP 27219184A JP 27219184 A JP27219184 A JP 27219184A JP S61149416 A JPS61149416 A JP S61149416A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- hot metal
- pig iron
- suction
- molten pig
- 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
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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (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)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、溶銑予備処理方法、特に、いわゆる高炉と適
宜受銑容器とを連絡する出銑樋中における溶銑予備処理
方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for pretreatment of hot metal, in particular a method for pretreatment of hot metal in a tap runner connecting a so-called blast furnace and a suitable pig iron receiving vessel.
(従来の技術)
高炉からの溶銑を受ける出銑樋中での溶銑予備処理の重
要性あるいは必要性は、転炉の負担軽減および生産性の
向上といった今日的目的から、近年に至り、その重要性
が認められるようになってきた。しかしながら、そのよ
うな予備処理に引き続く除滓方法としては、特開昭54
−137420号などに見られるように溶銑上のスラグ
の流出を防ぐ分離壁(以下、単に“スキンマー”という
)を設け、その上流のスラグ溜りにオーバーフロ一式の
滓樋を設け、流出させるのが一般的であった。しかし、
このスキンマ一方式は、溶銑樋の堰部での深さを十分に
とるとともにスラグ溜りを形成してその長さを充分取る
必要があり、構造上問題があった。(Prior art) The importance or necessity of pre-treatment of hot metal in the tap hole that receives hot metal from the blast furnace has been recognized in recent years due to modern objectives such as reducing the load on the converter and improving productivity. Gender is beginning to be recognized. However, as a method for removing sludge following such preliminary treatment, Japanese Patent Laid-Open No. 54
-137420, etc., a separation wall (hereinafter simply referred to as a "skinmer") is installed to prevent the slag on the hot metal from flowing out, and a slag trough with an overflow set is installed in the slag pool upstream of the wall to prevent the slag from flowing out. It was common. but,
This one-type skimmer had structural problems because it required a sufficient depth at the dam of the hot metal trough and a sufficient length to form a slag pool.
一方、出銑樋上での排滓を行わずに、次工程である混銑
車内で排滓を行う方法としては、実公昭58−3794
3号のようなスラグ掻寄装置や特公昭58−41435
号のような、真空吸引除滓装置などが知られている。し
かし、いづれの方法も混銑車内での作業であり、排滓処
理のために、一工程を要することとなり時間的、作業的
に余分な費用がかかる。また、スラグ掻取を行うと同時
に溶銑流出も多く、歩留り悪化(f4銑歩留)となり、
さらに、吸引除滓の効率はスラグ性状によって大きく影
響を受け、特公昭58−38484号などに見られるよ
うな温度低下に応じたスラグ流動性改善策を行わなけれ
ばならない。On the other hand, as a method of removing the slag in the next step, which is the pig-mixing car, without removing the slag on the tap runner, there is a method called
Slag scraping device such as No. 3 and Special Publication No. 58-41435
Vacuum suction sludge removal devices such as No. 1 are known. However, both methods require work inside a pig iron mixer car, and require one step to treat the slag, resulting in extra costs in terms of time and work. In addition, a lot of hot metal flows out at the same time as slag scraping, resulting in poor yield (f4 pig iron yield).
Furthermore, the efficiency of suction slag removal is greatly affected by the properties of the slag, and it is necessary to take measures to improve the fluidity of the slag in response to a decrease in temperature, as seen in Japanese Patent Publication No. 58-38484.
一方、真空吸引装置を溶銑樋上に設置するのは、従来装
置(水を噴射し、スラグをスラリー化して吸引)では真
空下での水処理装置を必要とすることより設備が犬山り
となり設置場所的および設備費用的に実用的でなかった
。On the other hand, installing a vacuum suction device above the hot metal gutter requires a water treatment device under vacuum with conventional devices (injecting water and suctioning slag into a slurry), which requires a lot of equipment and space for installation. It was impractical in terms of target and equipment cost.
・(発明が解決すべき問題点)
上述のように、現在のところ、既設の高炉での出銑樋中
の予備精錬にあっては精錬後の溶銑をスラグと共に混銑
車に受け入れ、その後混銑車内においてスラグをスラグ
ドラッガーのような機械的除滓方法や、真空除滓機によ
るスラグ除去方法等によって除去している。したがって
、出銑樋中での予備精錬といっても後段の精錬はいきお
い混銑車の中で行われることが多くなり、そのため、こ
の方法の欠点は、混銑車の中での精錬時間が余分にかか
るということであり、この間における除滓、精錬に要す
る時間による温度降下等、後続の工程に及ぼす影響は少
なくない。- (Problems to be solved by the invention) As mentioned above, at present, during preliminary refining in the tap sluice of an existing blast furnace, the molten pig iron after refining is received into the pig iron mixer car together with slag, and then the hot metal is transferred into the pig iron mixer car. The slag is removed by a mechanical slag removal method such as a slag dragger, a slag removal method using a vacuum slag remover, or the like. Therefore, even though preliminary refining is carried out in the tap runner, the subsequent refining is often carried out in the pig iron mixer car.The disadvantage of this method is that the refining time in the pig iron mixer car is extra. This means that during this time, the temperature drop due to the time required for slag removal and refining, etc., has a considerable influence on subsequent steps.
(問題点を解決する手段)
ここに、本発明の目的とするところはこのような既設高
炉での出銑樋中にありでも容易に溶銑の予備精錬ができ
るような簡単な除滓方法を伴った溶銑の予備処理方法を
提供することである。(Means for Solving the Problems) The object of the present invention is to provide a simple method for removing slag that can easily pre-smelt hot metal even if it is in the tap trough of an existing blast furnace. An object of the present invention is to provide a method for pretreatment of hot metal.
本発明の別の目的は、高炉からの出銑樋における精錬を
連続して行うに当たり、必要な除滓工程を既設の高炉に
おいても容易に組み込むことを可能にする、溶銑の予備
処理方法を提供することである。Another object of the present invention is to provide a method for pre-treatment of hot metal, which makes it possible to easily incorporate the necessary slag removal process into an existing blast furnace when continuously refining in the tap culvert from the blast furnace. It is to be.
すなわち、本発明は、減圧された可動式管の先端を樋内
を流れる溶銑上部のスラグに接近させることによりその
吸引力によりスラグを除去することを特徴とする溶銑予
備処理方法である。この方法により、減圧吸引方式を採
用しているとともにその吸引ノズルは可動式となってい
るため既設の高炉からの出銑樋中に容易に除滓装置が設
置される。なお、ここに、出銑樋には、溶銑流の方向を
変える傾注樋等も含まれる。That is, the present invention is a hot metal pretreatment method characterized in that the tip of a depressurized movable tube is brought close to the slag above the hot metal flowing in the gutter, and the slag is removed by the suction force. This method uses a reduced pressure suction system and the suction nozzle is movable, so the slag removal device can be easily installed in the tap trough from an existing blast furnace. Note that the tapping trough here also includes a tilting trough that changes the direction of the flow of hot metal.
より詳述すれば、本発明の要旨とするところは、高炉か
らの溶銑を一端で受け入れ、他端から受銑容器に注入す
る出銑樋において、該出銑樋を流れる溶銑に精錬剤を添
加し、該精錬剤の添加により生成した浮遊スラグを、前
記出銑樋の適宜位置で吸引ノズル先端を溶銑表面に接近
させて該溶銑表面から吸引除去することを特徴とする溶
銑予備処理方法である。More specifically, the gist of the present invention is to add a refining agent to the hot metal flowing through the tap hole, which receives hot metal from a blast furnace at one end and injects it into a receiving container from the other end. The hot metal pretreatment method is characterized in that floating slag generated by adding the refining agent is removed by suction from the surface of the hot metal by bringing the tip of a suction nozzle close to the surface of the hot metal at an appropriate position in the tap flue. .
なお、出銑樋上の可動式ノズル先端を備え・た減圧除滓
装置としては、特願昭59−164629号に開示した
装置を用い、精錬剤添加後の溶銑流の上部浮遊スラグを
吸引除去するのである。The decompression slag removing device equipped with a movable nozzle tip on the tap runner is the device disclosed in Japanese Patent Application No. 164629/1983, which sucks and removes the slag floating at the top of the hot metal flow after addition of the refining agent. It is.
特に、溶銑脱珪処理は、脱硅剤と溶銑との混合さえ良好
であれば、脱珪反応が極めて速いことから、脱硅剤添加
位置より約1m(反応時間として約10〜30秒)の位
置で浮遊生成スラグを吸引することにより、脱硅滓の8
0%以上が除去可能である。In particular, in hot metal desiliconization treatment, as long as the desiliconizing agent and hot metal are well mixed, the desiliconizing reaction is extremely fast. 8 of slag removal by suctioning the floating slag at the
More than 0% can be removed.
これからも分かるように、減圧された管によりスラグを
吸引除去する方法は溶鋼や、混銑車内のスラグを除滓す
るときにしばしば採用される方法であるが、この方法の
特徴は減圧管を中心として半径“a”の周辺のみ吸引除
去することが可能である。(“a”は減圧圧力、スラグ
性状、スラグと減圧管距離等によって変わる)。ここに
、“a″は本発明者らの実験結果によればおおむね1m
以内である。一方、溶鋼や混銑車内のスラグ表面は長さ
5〜10 mに及ぶこともしばしばである。したがって
溶鋼や混銑車内のスラグを吸引除去するためには、その
他のスラグを吸引管の周辺にかきよせる別の装置もしく
は減圧管の吸引管を移動させるなど必要性が出てくる。As you can see, the method of suctioning and removing slag using a reduced pressure pipe is often adopted when removing slag from molten steel or pig iron mixers. It is possible to suction remove only the area around radius "a". (“a” varies depending on the vacuum pressure, slag properties, distance between the slag and the vacuum pipe, etc.). Here, "a" is approximately 1 m according to the experimental results of the present inventors.
Within On the other hand, the slag surface inside the molten steel or pig iron mixer car often has a length of 5 to 10 m. Therefore, in order to remove the molten steel and slag in the pig iron car by suction, it becomes necessary to use another device to stir up other slag around the suction pipe or to move the suction pipe of the pressure reducing pipe.
しかしながら、本発明の方法においては高炉の樋の幅は
通常1m以内であるため、上記の減圧管を樋の幅方向に
移動させる等の工夫は必要でなく単に橋上に近接させる
ことにより樋全幅に渡り容易に除滓できるのである。た
だ、溶銑流速の変化や、精錬剤添加量の変化に伴い、精
錬剤吹込み位置より下流の最適吸引位置が変わるため、
除滓用吸引管は、溶銑流れ方向に対しては可動式とする
のが好ましい。However, in the method of the present invention, since the width of the blast furnace gutter is usually within 1 m, it is not necessary to move the pressure reducing pipe described above in the width direction of the gutter, and by simply moving it close to the bridge, the entire width of the gutter can be increased. It is easy to cross and remove slag. However, due to changes in the hot metal flow rate and changes in the amount of refining agent added, the optimal suction position downstream of the refining agent injection position changes.
It is preferable that the slag removal suction pipe be movable with respect to the flow direction of the hot metal.
このように、除滓装置としては、真空吸引式、エジェク
タ一方式等特に制限されないが、実際上からは乾式のエ
ジェクタ一方式が好ましい。As described above, the sludge removing device is not particularly limited to a vacuum suction type, a single ejector type, etc., but a dry type one ejector type is preferred from a practical point of view.
脱硅剤の添加法は、高圧ガスによる上部よりのインジェ
クション法が混合率(時間当たりの混合率)および溶銑
の攪拌面よりもっとも好ましく、反応時間も短くできる
。As for the method of adding the desiliconizing agent, the injection method from the top using high pressure gas is most preferable in terms of the mixing rate (mixing rate per hour) and the stirring surface of the hot metal, and the reaction time can also be shortened.
出銑樋長さが充分あれば、次段階の処理(例えば、脱燐
処理)の生成スラグも同様に吸引可能であるが、一般的
には脱燐・脱硫反応は、脱硫反応に比べて遅く、その処
理剤も高価であることから、反応時間を充分にとり、混
合も行えることが必要となるため出銑樋上での吸引除去
は必ずしも有利ではない。しかし、反応速度の極めて早
い、例えばソーダ灰系の精錬剤を用いた場合は、脱燐、
脱硫反応が10秒前後で最も効率が高くなり、その後は
復燐、復硫による効率低下となるため、該反応の最も高
効率点(精錬剤吹き込み点より10秒程溶銑の流れた点
)で本発明の除滓を行うことが好ましい。If the tap runner is long enough, the slag produced in the next stage of treatment (for example, dephosphorization) can be sucked in as well, but in general, dephosphorization and desulfurization reactions are slower than desulfurization reactions. Since the treatment agent is also expensive, it is necessary to allow sufficient reaction time and to perform mixing, so removal by suction on the tap trough is not necessarily advantageous. However, if a soda ash-based refining agent with an extremely fast reaction rate is used, dephosphorization,
The desulfurization reaction reaches its highest efficiency at around 10 seconds, and after that the efficiency decreases due to rephosphorization and resulfurization. It is preferable to carry out the slag removal of the present invention.
なお、出銑樋上で続けて処理を行わなくても、従来の脱
硫スラグを全て混銑車に入れる場合に比べて、スラグ量
が極端に少なくなるため、スラグフォーミング(未反応
脱硫剤が混銑車内で反応し、スラグ吹き出しが起こる現
象)が少なく、混銑車内の溶銑量を多くすることができ
、工程的、能率的またはフォーミング防止剤の費用を減
少できるなどのメリットがある。In addition, even without continuous treatment on the tap runner, the amount of slag is extremely reduced compared to the conventional case where all desulfurization slag is put into the mixer car. It has the advantage of reducing the amount of molten pig iron in the pig iron mixing car (reactions and slag blowing), increasing process efficiency, and reducing the cost of forming inhibitors.
(作用)
次に、添付図面によって本発明をさらに詳しく説明する
。(Operation) Next, the present invention will be explained in more detail with reference to the accompanying drawings.
添付図面のうち第1図は本発明に係る溶銑予備処理方法
を利用した場合の高炉出銑から転炉に至るまでの処理工
程のフローチャートである。第2図は同じ〈従来のそれ
を示すものである。Among the accompanying drawings, FIG. 1 is a flowchart of the treatment steps from blast furnace tapping to converter when the hot metal pretreatment method according to the present invention is utilized. Figure 2 shows the same (conventional).
すなわち、本発明によれば、高炉からの溶銑はまず出銑
樋上でスキンマーにより高炉滓が除去され、次いで本発
明にしたがって溶銑流への精錬剤の投入、つまり脱硫処
理、吸引除滓が行われる。That is, according to the present invention, the blast furnace slag is first removed from the hot metal from the blast furnace by a skimmer on the tap trough, and then, according to the present invention, a refining agent is introduced into the hot metal flow, that is, a desulfurization treatment and suction slag removal are performed. .
脱硫処理および除滓が終了したところで今度は脱燐剤を
投入して脱燐を行う、一般に脱燐反応は進行が遅いため
出銑樋上では反応が完了せず、したがって除滓も行わな
い。脱燐剤とともに溶銑は傾注樋を経て混銑車に注入さ
れ、この場合橋上で充分な反応が得られなかった時、も
しくは、滓化不良でトーピード排滓が困難な時などは、
混銑車内でインジェクション等による溶銑攪拌を行い、
脱燐と同時に原性状改善を行い、次いでトーピード排滓
を行い、脱燐滓を除く。脱燐後、溶銑は取鍋に移され、
脱燐滓の残りを掻き出し、次いで脱硫剤を加えて脱硫を
行う。When the desulfurization treatment and slag removal are completed, a dephosphorizing agent is added to perform dephosphorization. Generally, the dephosphorization reaction progresses slowly, so the reaction does not complete on the tap runner, and therefore slag removal is not performed. Hot metal is injected together with a dephosphorizing agent into a pig iron mixer through a tilting culvert.In this case, if a sufficient reaction is not obtained on the bridge, or if it is difficult to remove the slag from the torpedo due to poor slag formation,
The hot metal is stirred by injection etc. in the pig iron mixing car.
At the same time as dephosphorization, the original properties are improved, and then torpedo removal is performed to remove the dephosphorization slag. After dephosphorization, the hot metal is transferred to a ladle,
The remainder of the dephosphorization slag is scraped out, and then a desulfurization agent is added to perform desulfurization.
なお、第1図に示す本発明例において最初スキンマーに
よって高炉滓を除去するのは一種の整流作用を行わせる
ためである。In the example of the present invention shown in FIG. 1, blast furnace slag is first removed by a skimmer in order to perform a kind of rectification effect.
第2図に示す従来例の場合、出銑樋中では脱硫剤の添加
のみが行われ、脱硫滓はトーピード排滓として除かれる
。脱硫反応そのものは速やかに起こるが、出銑樋上で生
成原を速やかに除去する手段がなかったためである。In the conventional example shown in FIG. 2, only the desulfurization agent is added in the tap runner, and the desulfurization slag is removed as torpedo slag. Although the desulfurization reaction itself occurs quickly, this is because there was no means to quickly remove the product on the tap runner.
第3図は、本発明において使用するスラグ吸引装置30
を使った樋精錬の略式説明図であり、減圧管31に接続
された圧力管32から吹き出る圧力ガス(2kg/cn
1以上)により発生する負圧により生じる吸引力により
吸引管33よりスラグ34が吸引される。吸引されたス
ラグは減圧管31の出口から吐き出され通常集塵機(図
示せず)により集塵される。FIG. 3 shows a slag suction device 30 used in the present invention.
It is a schematic explanatory diagram of gutter refining using the pressure gas (2 kg/cn
1 or more), the slag 34 is suctioned from the suction pipe 33 by the suction force generated by the negative pressure generated by the suction tube 33. The suctioned slag is discharged from the outlet of the pressure reducing pipe 31 and is usually collected by a dust collector (not shown).
圧力管32の吹込み位置は通常吸引管33のセンター付
近の直上部分が最も吸引力が強く望ましい。また、付着
性のスラグ、例えば脱硫スラグ等の場合は注水噴霧管3
5より注水することにより吸引管へのスラグ付着が防止
できる。あるいは石灰粉を添加し、スラグ性状を吸引中
に変えることも可能である。The blowing position of the pressure tube 32 is normally preferably a portion directly above the center of the suction tube 33, where the suction force is strongest. In addition, in the case of adhesive slag, such as desulfurization slag, the water injection pipe 3
By pouring water from 5, it is possible to prevent slag from adhering to the suction pipe. Alternatively, it is also possible to add lime powder to change the slag properties during suction.
吸引管33は垂直である必要はなく、場面に対し傾けて
もよい。この場合吸引力は落ちないが管壁抵抗によりス
ラグの吸引量は若干影響を受ける。The suction tube 33 need not be vertical, but may be tilted relative to the scene. In this case, the suction force does not decrease, but the amount of slag suction is slightly affected by the tube wall resistance.
圧力ガス体の圧力と減圧管31や吸引管33の径と吸引
管33の端面とスラグ面の距離の関係はスラグ性状によ
り大幅に異なるため実験的に確認する必要があるが、最
終的には圧力ガスの圧力とスラグ面と吸引管33の距離
により制御できる。 ”すでに述べたように、第3図
において本発明によれば、高炉からの溶銑40は、出銑
樋42に出銑され、混銑車に注入されるに先立って、ま
ず、従来のスキンマー44によって高炉滓が除去される
とともに整流される。次いで適宜精錬剤、例えば脱硫剤
をN2ガスとともにランス46を経てこの溶銑中に吹き
込む。脱硫剤は直ちに溶銑と反応してスラグを生成させ
て浮遊させる。この生成スラグ48はその後スラグ吸引
装置30によって吸引され、必要により脱燐剤をさらに
添加してから傾注樋50を経て混銑車(図示せず)に注
入される。The relationship between the pressure of the pressure gas body, the diameter of the pressure reducing pipe 31 and suction pipe 33, and the distance between the end face of the suction pipe 33 and the slag surface varies greatly depending on the slag properties, so it must be confirmed experimentally, but ultimately It can be controlled by the pressure of the pressure gas and the distance between the slag surface and the suction pipe 33. As already mentioned, in accordance with the present invention in FIG. 3, hot metal 40 from the blast furnace is first subjected to a conventional skimmer 44 before being tapped into the tap runner 42 and injected into the mixer car. Blast furnace slag is removed and rectified. Next, an appropriate refining agent, such as a desulfurizing agent, is blown into the hot metal together with N2 gas through a lance 46. The desulfurizing agent immediately reacts with the hot metal to form slag, which is suspended. This produced slag 48 is then sucked by the slag suction device 30, and after further adding a dephosphorizing agent if necessary, it is injected into a pig iron mixer (not shown) via a tilting trough 50.
次に、実施例によって本発明をさらに詳述する。Next, the present invention will be explained in further detail with reference to Examples.
実施例
第3図に示すと同様の溶銑予備処理装置を使用して高炉
から出銑された溶銑の予備精錬を行った。EXAMPLE A hot metal pretreatment apparatus similar to that shown in FIG. 3 was used to preliminarily refine hot metal tapped from a blast furnace.
処理条件および装置寸法は下掲表にまとめて示す。Processing conditions and equipment dimensions are summarized in the table below.
表
本発明によれば、スキンマー44により高炉滓が除去さ
れた時点でSi 0.50%であった溶銑が脱珪スラグ
を除去してからはSi 0.13%にまで低下し、これ
は脱珪率が74%である。生成スラグ除去地点は脱硅剤
投入地点寄り1m下流の地点であった。Table According to the present invention, the Si content of the hot metal which was 0.50% when the blast furnace slag was removed by the skimmer 44 decreased to 0.13% Si after the desiliconization slag was removed. The silica rate is 74%. The generated slag removal point was 1 m downstream from the point where the desiliconizing agent was introduced.
(効果)
かくして、本発明によれば、脱硅剤添加位置より1m以
上も下流に除滓管を設置することにより精錬反応の終っ
たスラグを吸引除去することができるため、引き続き脱
燐工程に入ることができる。(Effects) Thus, according to the present invention, by installing the slag removal pipe 1 m or more downstream from the point at which the desiliconizing agent is added, the slag after the refining reaction can be removed by suction. You can enter.
脱燐後のスラグは樋鼻や傾注樋の部分で除滓することが
できるが、精錬反応の終った後であればどこで除滓して
もよい。The slag after dephosphorization can be removed at the gutter nose or the tilting gutter, but it may be removed at any point after the refining reaction is completed.
したがって、本発明によれば溶銑は出銑樋上を流れなが
ら処理されるため、本発明に係る方法は何ら工程時間を
新たに付加するものではない。Therefore, according to the present invention, the hot metal is processed while flowing on the tap tap, so the method according to the present invention does not add any new process time.
第1図は、本発明方法を利用した場合の溶銑予備処理法
のフローチャート;
第2図は、従来の同じくフローチャート;および
第3図は、樋精錬の略式説明図である。
30ニスラグ吸引装置
31:減圧管
32:圧力管
33:吸引管
34ニスラグ
35;注水噴霧管
40 : ン容銑
42:出銑樋
44ニスキンマー
46二ランス
48:生成スラグ
出願人 住友金属工業株式会社
代理人 弁理士 広 瀬 章 −(化1名)10 へ
ψ
ro++;r寸寸
咳
茅
槃
Of−へ rO
rOr′OrOr0FIG. 1 is a flowchart of a hot metal pretreatment method using the method of the present invention; FIG. 2 is a flowchart of the conventional method; and FIG. 3 is a schematic explanatory diagram of gutter refining. 30 Nisslag suction device 31: Pressure reducing pipe 32: Pressure pipe 33: Suction pipe 34 Varnish slag 35; Water injection spray pipe 40: Pig capacity 42: Tapping sluice 44 Niss slag 46 Second lance 48: Generated slag Applicant Agent Sumitomo Metal Industries, Ltd. Person Patent Attorney Akira Hirose - (1 person) 10 to ψ ro++;r size cough Kayan Of- to rO rOr'OrOr0
Claims (3)
容器に注入する出銑樋において、該出銑樋を流れる溶銑
に精錬剤を添加し、該精錬剤の添加により生成した浮遊
スラグを、前記出銑樋の適宜位置で吸引ノズル先端を溶
銑表面に接近させて該溶銑表面から吸引除去することを
特徴とする溶銑予備処理方法。(1) A refining agent is added to the hot metal flowing through the tap trough, which receives hot metal from the blast furnace at one end and injects it into the receiving vessel from the other end, and floating slag is generated by the addition of the refining agent. A hot metal pretreatment method characterized in that the suction nozzle tip is brought close to the surface of the hot metal at an appropriate position of the tap duct to remove the hot metal by suction from the surface of the hot metal.
スラグを溶銑表面から吸引除去してから脱燐剤を添加す
る、特許請求の範囲第1項記載の溶銑予備処理方法。(2) The hot metal pretreatment method according to claim 1, wherein a dephosphorizing agent is added as the refining agent, and the generated floating slag is removed by suction from the surface of the hot metal, and then the dephosphorizing agent is added.
囲第1項または第2項記載の溶銑予備処理方法。(3) The hot metal pretreatment method according to claim 1 or 2, wherein the tip of the suction nozzle is movable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27219184A JPS61149416A (en) | 1984-12-24 | 1984-12-24 | Pretreatment of molten pig iron |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27219184A JPS61149416A (en) | 1984-12-24 | 1984-12-24 | Pretreatment of molten pig iron |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61149416A true JPS61149416A (en) | 1986-07-08 |
Family
ID=17510353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27219184A Pending JPS61149416A (en) | 1984-12-24 | 1984-12-24 | Pretreatment of molten pig iron |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61149416A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63238207A (en) * | 1987-03-27 | 1988-10-04 | Nippon Steel Corp | Method for pretreating molten iron |
JPS63238209A (en) * | 1987-03-27 | 1988-10-04 | Nippon Steel Corp | Method for pretreating molten iron |
-
1984
- 1984-12-24 JP JP27219184A patent/JPS61149416A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63238207A (en) * | 1987-03-27 | 1988-10-04 | Nippon Steel Corp | Method for pretreating molten iron |
JPS63238209A (en) * | 1987-03-27 | 1988-10-04 | Nippon Steel Corp | Method for pretreating molten iron |
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