JPH11172313A - Method for dephosphorizing molten iron - Google Patents
Method for dephosphorizing molten ironInfo
- Publication number
- JPH11172313A JPH11172313A JP34301997A JP34301997A JPH11172313A JP H11172313 A JPH11172313 A JP H11172313A JP 34301997 A JP34301997 A JP 34301997A JP 34301997 A JP34301997 A JP 34301997A JP H11172313 A JPH11172313 A JP H11172313A
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- powder
- concentration
- cao
- 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.)
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Links
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＣａＯ粉およびＡ
ｌ2 Ｏ3 粉を含有する混合物を溶銑に吹き付けて行う溶
銑の脱Ｐ方法に関する。TECHNICAL FIELD The present invention relates to CaO powder and A
The present invention relates to a method for removing hot metal by spraying a mixture containing l 2 O 3 powder onto hot metal.
【０００２】[0002]
【従来の技術】近年、鋼材に対する品質要求が高度化し
低Ｐ鋼に対する需要が増大している。また、鋼の溶製コ
スト合理化およびスラグの処理にかかわる環境問題の対
策として、スラグ発生量の低減が求められている。特開
平８−３１１５２３号公報には、蛍石等の融点降下剤を
用いずにＣａＯ粉のみを上吹き酸素と共に溶銑に吹き付
けることで溶銑を脱Ｐする方法が開示されている。この
方法は、複合吹錬の酸素量をコントロールすることによ
り、スラグ中の( ＦｅＯ) 濃度を適正化できるため、蛍
石等の融点降下剤を使用せずにＣａＯ粉体のみで、スラ
グを速やかに生成でき、溶銑脱Ｐスラグ量を大幅に低減
できるとしている。2. Description of the Related Art In recent years, quality requirements for steel materials have become higher and demands for low-P steel have increased. Further, reduction of slag generation is required as a measure to rationalize the cost of steel smelting and to deal with environmental problems related to slag treatment. Japanese Patent Application Laid-Open No. 8-31523 discloses a method of removing P from hot metal by blowing only CaO powder onto hot metal together with top-blown oxygen without using a melting point depressant such as fluorite. According to this method, the (FeO) concentration in the slag can be optimized by controlling the amount of oxygen in the combined blowing, so that the slag can be quickly formed using only CaO powder without using a melting point depressant such as fluorite. To reduce the amount of hot metal de-P slag.
【０００３】[0003]
【発明が解決しようとする課題】しかし、前記特開平８
−３１１５２３号公報の方法は、溶銑中の［Ｓｉ］濃度
が０．３０％以下において、フラックスの滓化率が低く
なるという問題がある。この理由は、溶銑中の［Ｓｉ］
濃度が０．３０％を超えると、脱珪反応で発生した熱に
よってフラックスが溶融し、しかも生成したＳｉＯ2 と
ＣａＯが反応して低融点のスラグを形成するため、蛍石
等の融点降下剤を用いずにＣａＯが滓化できるからであ
る。However, Japanese Patent Application Laid-Open No. Hei 8
The method disclosed in Japanese Patent No. 3111523 has a problem that when the [Si] concentration in the hot metal is 0.30% or less, the slagging rate of the flux becomes low. This is because [Si] in the hot metal
When the concentration exceeds 0.30%, the flux is melted by the heat generated in the desiliconization reaction, and the generated SiO 2 and CaO react to form a low melting point slag. This is because CaO can be converted into a slag without using slag.
【０００４】従って、溶銑中の［Ｓｉ］濃度が低くなれ
ばそれだけ熱源が不足し、滓化しにくくなる。しかも、
実操業のサイクルタイムから要求される約１０分という
短時間吹錬で、十分に滓化させて溶銑中の［Ｐ］濃度を
目標濃度に低下させることは、極めて難しいことといえ
る。[0004] Therefore, the lower the [Si] concentration in the hot metal, the shorter the heat source becomes, and the harder it becomes to slag. Moreover,
It can be said that it is extremely difficult to sufficiently reduce the [P] concentration in the hot metal to the target concentration by short-time blowing of about 10 minutes required from the actual operation cycle time.
【０００５】溶銑中の［Ｓｉ］濃度が低い方が、少ない
ＣａＯ量で脱Ｐ能力の高い高塩基度（ＣａＯ／Ｓｉ
Ｏ2 ）のスラグを形成できるので、脱Ｐスラグの発生量
を低減できることになる。したがって、高炉から出た溶
銑に酸化鉄等を添加して脱珪することにより、溶銑中の
［Ｓｉ］濃度を低くした状態で、脱Ｐできる技術を確立
する必要がある。[0005] The lower the [Si] concentration in the hot metal, the higher the basicity (CaO / Si
Since the slag of O 2 ) can be formed, the generation amount of P-free slag can be reduced. Therefore, it is necessary to establish a technology capable of removing P by adding iron oxide or the like to the hot metal discharged from the blast furnace and desiliconizing the hot metal so that the [Si] concentration in the hot metal is reduced.
【０００６】熱源の不足による滓化不足を補う手段とし
て、融点降下剤のハロゲン系化合物やアルカリ系化合物
を併用するのが有効であるが、炉体の耐火物溶損量が増
加するという問題がある。It is effective to use a halogen-based compound or an alkali-based compound as a melting point depressant as a means for compensating for insufficient slagging due to a shortage of a heat source, but there is a problem that the refractory erosion of the furnace body increases. is there.
【０００７】本発明の目的は、溶銑中の［Ｓｉ］濃度が
０．１５％以下の低いレベルにおいて溶銑の脱Ｐをする
際に、ハロゲン系化合物およびアルカリ系化合物を併用
することなく、約１０分の短時間吹錬で滓化を十分に進
行させることにより、少量のスラグで溶銑の脱Ｐを行
い、溶銑中の［Ｐ］濃度が０．０３０％以下で、しかも
スピッティングの発生量も低位に抑えられる方法を提供
することにある。An object of the present invention is to remove P from hot metal at a low [Si] concentration of 0.15% or less without using a halogen-based compound and an alkali-based compound at a low level. The slagification is sufficiently advanced by short-time blowing to remove the hot metal with a small amount of slag, and the [P] concentration in the hot metal is 0.030% or less, and the amount of spitting is also reduced. An object of the present invention is to provide a method that can be suppressed to a low level.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、かかる目
的を達成すべく種々検討を重ね、以下（Ａ）〜（Ｃ）の
知見を得た。Means for Solving the Problems The present inventors have conducted various studies in order to achieve the object and obtained the following findings (A) to (C).
【０００９】（Ａ）酸化鉄の添加により、吹錬初期のス
ラグの酸素ポテンシャルを高く維持すれば、吹錬初期に
生成したリン酸化物と溶銑に吹き付けたＣａＯ粉との反
応で生じたリン酸カルシウムをスラグ中で安定して存在
させることができる。(A) If the oxygen potential of the slag at the initial stage of blowing is maintained high by the addition of iron oxide, calcium phosphate generated by the reaction between the phosphor oxide generated at the initial stage of blowing and the CaO powder sprayed on the hot metal is reduced. It can be stably present in the slag.
【００１０】また、吹錬初期から溶銑表面を酸化鉄が覆
っているので、スピッティング発生量も低位に抑えられ
る。Further, since the surface of the hot metal is covered with iron oxide from the beginning of blowing, the amount of spitting can be suppressed to a low level.
【００１１】（Ｂ）ＣａＯ単体の融点は約２６００℃で
あり、ＣａＯ単体を溶融させるのは難しく、また、酸素
ジェットで生成したＦｅＯとＣａＯ固体が反応して溶融
するのは遅く、時間がかかる。(B) The melting point of CaO alone is about 2600 ° C., so that it is difficult to melt CaO alone, and it is slow and time-consuming to react and melt FeO and CaO solids generated by an oxygen jet. .
【００１２】（Ｃ）ＣａＯ単体に加えて、Ａｌ2 Ｏ3 を
少量添加することによって火点（酸素ジェットが溶銑表
面と衝突する部分) で融点の低い化合物（12ＣａＯ・7
Ａｌ2Ｏ3 ：融点は約１４００℃）を部分的に形成させ
ることができる。この溶融部分を起点として、酸素ジェ
ットにより生成したＦｅＯあるいは／および添加した酸
化鉄とが速やかに反応する。これらの反応により、滓化
速度が飛躍的に上昇し、約１０分の短時間吹錬で滓化を
十分に進行でき、かつ処理後の溶銑中の［Ｐ］濃度を
０．０３０％以下にすることができる。(C) In addition to CaO alone, by adding a small amount of Al 2 O 3 , a compound (12CaO · 7) having a low melting point at the fire point (the portion where the oxygen jet collides with the hot metal surface)
Al 2 O 3 : melting point is about 1400 ° C.). Starting from the molten portion, FeO generated by the oxygen jet and / or the added iron oxide reacts quickly. By these reactions, the slagging rate is dramatically increased, slagging can be sufficiently advanced by short-time blowing for about 10 minutes, and the [P] concentration in the hot metal after the treatment is reduced to 0.030% or less. can do.
【００１３】本発明は、以上の知見に基づいてなされた
もので、その要旨は、上底吹き転炉型反応容器に収容さ
れた溶銑に酸化鉄を添加後、上吹きランスよりＣａＯ粉
およびＡｌ2 Ｏ3 粉を含有する混合物を該溶銑に吹き付
けるする際、該混合物のＡｌ2 Ｏ 3粉の割合がＣａＯ粉
添加量の３〜２０％であり、該溶銑１ton 当たり０．５
〜２．０Nm3/min の酸素をキャリアーガスとして前記上
吹きランスから吹き付けるとともに、前記上底吹き転炉
型反応容器の炉底から溶銑１ton 当たり０．０５〜０．
６０Nm3/min の攪拌用ガスを吹き込むことを特徴とする
溶銑の脱Ｐ方法である。The present invention has been made based on the above findings. The gist of the present invention is that after adding iron oxide to hot metal contained in a top-bottom-blowing converter type reaction vessel, CaO powder and Al When the mixture containing 2 O 3 powder is sprayed onto the hot metal, the proportion of Al 2 O 3 powder in the mixture is 3 to 20% of the added amount of CaO powder, and 0.5% per ton of the hot metal.
With blowing oxygen ~2.0Nm 3 / min from the upper lance as a carrier gas, per molten iron 1ton from the furnace bottom of the upper base blown converter type reaction vessel from 0.05 to 0.
This is a method for removing hot metal, which comprises blowing a stirring gas of 60 Nm 3 / min.
【００１４】[0014]
【発明の実施の形態】本発明において使用するＣａＯの
量は、処理すべき溶銑に含まれるＰの総量、つまり除去
すべきＰの量によって決まる量である。なお、ＣａＯ
は、ＣａＣＯ3を含有しているものでもよい溶銑中には
０．１０％（以下、％は全て重量％を示す。）のＰが含
まれているとすると、０．０３％まで低下させるには、
溶銑１ton 当たりのＣａＯの量は約１５ｋｇである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The amount of CaO used in the present invention is an amount determined by the total amount of P contained in the hot metal to be treated, that is, the amount of P to be removed. In addition, CaO
If the hot metal which may contain CaCO 3 contains 0.10% of P (hereinafter, “%” indicates weight%), the content of the hot metal is reduced to 0.03%. Is
The amount of CaO per ton of hot metal is about 15 kg.
【００１５】Ａｌ2 Ｏ3 粉の使用量は、使用するＣａＯ
量粉の３〜２０％が望ましい。図１は、 Ａｌ2 Ｏ3 粉
の添加割合（Ａｌ2 Ｏ3 粉）／（ＣａＯ粉）と脱Ｐ処理
後の滓化度および溶銑中の［Ｐ］濃度との関係を示す。The amount of the Al 2 O 3 powder used is determined by the amount of CaO used.
3-20% of the mass powder is desirable. Figure 1 shows the relationship between the [P] concentration in the slag formation level and molten iron after Al 2 O 3 addition ratio (Al 2 O 3 powder) Powder / (CaO powder) and de-P treatment.
【００１６】なお、ＣａＯの滓化度は下記(1) 式に基づ
き計算した。 滓化度＝（溶銑脱Ｐ後のスラグ中の塩基度(CaO/SiO2)重
量比）／（装入時の見かけ塩基度(CaO/SiO2)重量比) ）
・・・・（１） ＣａＯおよびＡｌ2 Ｏ3 は粉末状で供給され、酸素とと
もに上吹きランスから溶銑表面に吹き付けられる。その
粒度の好ましい範囲は１５〜１５０μm であり、より好
ましくは１５〜５０μm である。The degree of slagging of CaO was calculated based on the following equation (1). Degree of slag = (basic ratio (CaO / SiO 2 ) weight ratio in slag after hot metal removal P) / (apparent basicity (CaO / SiO 2 ) weight ratio at the time of charging))
···· (1) CaO and Al 2 O 3 is supplied in powder form is blown from the top lance to the molten iron surface with oxygen. The preferred range of the particle size is 15 to 150 μm, more preferably 15 to 50 μm.
【００１７】図１に示すように、溶銑中の［Ｓｉ］濃度
が０．１５％以内の溶銑を脱Ｐする場合、３％未満で
は、Ａｌ2 Ｏ3 粉の添加によるフラックスの滓化促進効
果が得られないので３％以上の添加が必要である。しか
し、２０％を超えると、スラグ中のＣａＯ濃度が低下す
るので、スラグのＣａＯ活量が低下し、同様に脱Ｐ能力
が下がり、処理後の溶銑中の［Ｐ］濃度は、０．０３％
を超えた値となるので上限を２０％とした。好ましくは
５〜１５％である。As shown in FIG. 1, when removing [P] hot metal having a [Si] concentration within 0.15% in the hot metal, if it is less than 3%, the effect of adding Al 2 O 3 powder to promote slagging of the flux. Is not obtained, so addition of 3% or more is necessary. However, if it exceeds 20%, the CaO concentration in the slag decreases, so that the CaO activity of the slag decreases, the P removal capacity also decreases, and the [P] concentration in the hot metal after the treatment becomes 0.03%. %
, The upper limit was set to 20%. Preferably it is 5 to 15%.
【００１８】酸化鉄の添加量は熱バランスから算出され
るが、少なくとも溶銑１ton 当たりＦｅ2 Ｏ3 換算で３
kgを添加する必要がある。The amount of iron oxide to be added is calculated from the heat balance, and is at least 3 in terms of Fe 2 O 3 per ton of hot metal.
kg need to be added.
【００１９】図２は、酸化鉄として鉄鉱石（Ｆｅ2 Ｏ3
が主成分）を使用した時の添加量と脱Ｐ処理後の溶銑中
の［Ｐ］濃度およびスピッティングの発生量との関係を
示す。なお、添加量はＦｅ分をＦｅ2 Ｏ3 換算してい
る。FIG. 2 shows that iron ore (Fe 2 O 3) is used as iron oxide.
The following shows the relationship between the amount of addition when using (main component), the [P] concentration in the hot metal after the de-P treatment, and the amount of spitting generated. The amount of addition is obtained by converting the Fe content into Fe 2 O 3 .
【００２０】図２に示すように、溶銑中の［Ｓｉ］濃度
が０．１５％以内の溶銑を脱Ｐする場合、酸化鉄の添加
量が溶銑１ton 当たり３kg未満であると滓化が遅れ、ス
ピッティングの発生量も増加する。上吹き酸素流量は、
溶銑１ton 当たり０．５〜２．０Nm3/min が望ましい。As shown in FIG. 2, when hot metal having a [Si] concentration of 0.15% or less in hot metal is removed from the hot metal, if the amount of iron oxide added is less than 3 kg per ton of hot metal, slagification is delayed. The amount of spitting also increases. The top blowing oxygen flow rate is
0.5 to 2.0 Nm 3 / min per ton of hot metal is desirable.
【００２１】図３は、ＣａＯおよびＡｌ2 Ｏ3 を含有す
る粉からなる混合粉を酸素とともに吹き付ける上吹き酸
素流量とＣａＯの滓化度およびスピッティング発生量と
の関係を示したものである。FIG. 3 shows the relationship between the flow rate of top blown oxygen, which blows a mixed powder comprising powder containing CaO and Al 2 O 3 together with oxygen, the degree of slagging of CaO, and the amount of spitting.
【００２２】図３に示すように、滓化度０．９以上を得
るには、溶銑１ton 当たり０．５Nm3/min 以上の酸素吹
き込みが必要である。しかし、２．０Nm3/min を超える
とその効果はほぼ一定となる。As shown in FIG. 3, in order to obtain a degree of slagging of 0.9 or more, it is necessary to blow oxygen of 0.5 Nm 3 / min or more per ton of hot metal. However, if it exceeds 2.0 Nm 3 / min, the effect becomes almost constant.
【００２３】一方、スピッティング発生量は、上吹き酸
素流量が溶銑１ton 当たり２．０Nm3/min を超えると急
増するので上限を２．０Nm3/min とした。炉底部から吹
き込む攪拌用ガスはＡｒ、Ｎ2 等の不活性ガスやＣＯ2
ガス等である。On the other hand, spitting generation amount, top-blown oxygen flow the upper limit was made 2.0 Nm 3 / min so that surge exceeds hot metal 1ton per 2.0 Nm 3 / min. The stirring gas blown from the bottom of the furnace is an inert gas such as Ar or N 2 or CO 2.
Gas and the like.
【００２４】攪拌を行うことで反応速度を向上できる
が、溶銑脱Ｐ工程では、攪拌を強化すると、溶銑中の
［Ｃ］によりスラグ中の酸化鉄が還元され、脱Ｐ処理に
悪影響を与える可能性があり、臨界点が存在する。Although the reaction rate can be improved by stirring, in the hot metal de-P step, if the stirring is strengthened, iron oxide in the slag is reduced by [C] in the hot metal, which may have an adverse effect on the de-P processing. And there is a critical point.
【００２５】図４は、底吹きＡｒ流量（攪拌用ガス流
量）を変化させた時の処理後の溶銑中の［Ｐ］濃度の変
化を示すものである。図４の前提条件は、処理前の溶銑
中の［Ｓｉ］濃度が０．１１〜０．１４％で、上吹き酸
素流量を溶銑１ton 当たり１．２Nm3/min とし、ＣａＯ
粉およびＡｌ2 Ｏ3 粉を吹き付けて脱Ｐする方法であ
る。図４に示すように、溶銑中の［Ｐ］濃度を０．０３
％以下に脱Ｐするためには底吹きＡｒ流量が溶銑１ton
当たり０．０５〜０．６０Nm3/min であることが望まし
い。好ましくは０．１０〜０．５０Nm3/min である攪拌
が効果的である底吹きＡｒ流量の下限は、０．０５Nm3/
min であり、上限は、前記の溶銑中の［Ｃ］によるスラ
グ中の酸化鉄の還元反応が脱Ｐ反応に悪影響を与える臨
界点の０．６０Nm3/min であるといえる。FIG. 4 shows the change in the [P] concentration in the hot metal after the treatment when the bottom-flow Ar flow rate (stirring gas flow rate) is changed. The precondition of FIG. 4 is that the [Si] concentration in the hot metal before the treatment is 0.11 to 0.14%, the top blown oxygen flow rate is 1.2 Nm 3 / min per ton of hot metal,
This is a method of removing P by spraying powder and Al 2 O 3 powder. As shown in FIG. 4, the [P] concentration in the hot metal was 0.03
% Or less, the bottom blown Ar flow rate should be 1 ton
It is preferably 0.05 to 0.60 Nm 3 / min. Preferably the lower limit of the bottom blowing Ar flow stirred a 0.10~0.50Nm 3 / min to be effective, 0,05 Nm 3 /
It can be said that the upper limit is 0.60 Nm 3 / min, which is a critical point at which the reduction reaction of iron oxide in the slag by [C] in the hot metal adversely affects the P removal reaction.
【００２６】処理前の溶銑中の［Ｓｉ］濃度が低くなる
とフラックスの滓化が困難になり、溶銑中の［Ｐ］濃度
を目標濃度に低下できなくなるおそれがある。しかし、
溶銑中の［Ｓｉ］濃度が低くても滓化が十分に進行すれ
ば、ＣａＯ添加量が同じならばスラグの塩基度が上がる
のでスラグの脱Ｐ能力が上がり、むしろ溶銑の脱Ｐが容
易になる可能性がある。If the [Si] concentration in the hot metal before the treatment is low, it becomes difficult to make the flux slag, and the [P] concentration in the hot metal may not be able to be reduced to the target concentration. But,
Even if the [Si] concentration in the hot metal is low, if the slagging progresses sufficiently, the basicity of the slag increases if the amount of CaO added is the same, so that the slag de-P capacity increases, and rather, the de-P of the hot metal becomes easier. Could be.
【００２７】図５に、上吹き酸素流量を溶銑１ton 当た
り１．２Nm3/min 、底吹きＡｒガス流量を溶銑１ton 当
たり０．２Nm3/min 、鉄鉱石は溶銑１ton 当たり３kg以
上添加の条件下で、ＣａＯ粉を溶銑１ton 当たり１５k
g、Ａｌ2 Ｏ 3粉を溶銑１ton当たり０もしくは１．５kg
吹き付けて脱Ｐした結果を示す。FIG. 5 shows that the top blown oxygen flow rate was 1.2 Nm 3 / min per ton of hot metal, the bottom blown Ar gas flow rate was 0.2 Nm 3 / min per ton of hot metal, and iron ore was added at 3 kg or more per ton of hot metal. And CaO powder is reduced to 15k per ton of hot metal
g, 0 or 1.5 kg of Al 2 O 3 powder per ton of hot metal
The result of removing P by spraying is shown.
【００２８】図５に示すように、Ａｌ2 Ｏ3 粉を無添加
とした場合、溶銑中の［Ｓｉ］濃度が０．１５％以下に
なると処理後の溶銑中の［Ｐ］濃度が急激に上昇する
が、Ａｌ2 Ｏ3 粉を溶銑１ton 当たり１．５kg添加して
吹き付けた場合には、溶銑中の［Ｓｉ］濃度が０．１５
％以下になると溶銑中の［Ｐ］濃度が逆に降下する。As shown in FIG. 5, when the Al 2 O 3 powder was not added, when the [Si] concentration in the hot metal became 0.15% or less, the [P] concentration in the hot metal after the treatment sharply increased. However, when 1.5 kg of Al 2 O 3 powder was added per 1 ton of hot metal and sprayed, the [Si] concentration in the hot metal was 0.15.
% Or less, the [P] concentration in the hot metal drops conversely.
【００２９】本発明法のＣａＯ粉にＡｌ2 Ｏ3 粉を適正
比率で混合することにより、フラックスの滓化を促進し
て脱Ｐする場合には、溶銑中の［Ｓｉ］濃度を０．１５
％以下とすることが望ましい。When the CaO powder of the present invention is mixed with Al 2 O 3 powder at an appropriate ratio to promote slagging of the flux and remove P, the concentration of the [Si] in the hot metal is reduced to 0.15.
% Is desirable.
【００３０】[0030]
【実施例】溶銑処理前の成分が［Ｃ］約４．５％、［Ｓ
ｉ］０．０５〜０．５％、［Ｐ］約０．１０％、脱Ｐ処
理前温度１３００〜１３８０℃の溶銑２５０ton につい
て、処理条件を変更して上底吹き転炉にて溶銑脱Ｐ処理
を行った。処理後の温度は１３２０〜１３５０℃とし
た。EXAMPLE The component before hot metal treatment was [C] about 4.5%, [S
i] 0.05 to 0.5%, [P] about 0.10%, 250 tons of hot metal at a temperature before de-P treatment of 1300 to 1380 ° C. Processing was performed. The temperature after the treatment was 1320 to 1350 ° C.
【００３１】脱Ｐ剤としては、粒度２００メッシュアン
ダーのＣａＯ粉とＡｌ2 Ｏ3 粉をそれぞれ、溶銑１ton
当たり１５kg、０〜３．７５kgを上吹き酸素とともに溶
銑に吹き付けた。酸化鉄（Ｆｅ2 Ｏ3 ）は３〜２０kg/t
を添加した。As the P-removing agent, CaO powder having a particle size of less than 200 mesh and Al 2 O 3 powder were each added with 1 ton of hot metal.
15 kg per 0 to 3.75 kg was sprayed on the hot metal together with the top-blown oxygen. Iron oxide (Fe 2 O 3 ) is 3 to 20 kg / t
Was added.
【００３２】上吹き酸素流量および底吹きＡｒ流量は、
それぞれ溶銑１ton 当たり０．３〜２．５Nm3/min 、
０．０３〜０．７Nm3/min で変化させた。なお、吹錬時
間は１０分とした。The top blown oxygen flow rate and the bottom blown Ar flow rate are as follows:
0.3 to 2.5 Nm 3 / min per ton of hot metal,
It was varied between 0.03 and 0.7 Nm 3 / min. The blowing time was 10 minutes.
【００３３】表１に結果を示す。評価方法は、処理後の
溶銑中の［Ｐ］濃度が０．０３０％以下であり、かつス
ピッティング発生量が０．３kg/t以下を合格（○印）と
した。Table 1 shows the results. In the evaluation method, the [P] concentration in the hot metal after the treatment was 0.030% or less, and the spitting generation amount was 0.3 kg / t or less, which was regarded as acceptable (marked with ○).
【００３４】[0034]
【表１】 [Table 1]
【００３５】No．１〜７は、Ａｌ2 Ｏ3 の添加効果を調
べたものであるが、No．１とNo．７は溶銑中の［Ｐ］濃
度が０．０３０％を超えた。No．８〜１３は、上吹き酸
素流量の効果を調べたものであるが、No．８は溶銑中の
［Ｐ］濃度が０．０３０％を超え、No．１３はスピッテ
ィング発生量が０．３kg/tを超えた。No. 1-7, but in which we examined the effect of adding Al 2 O 3, No. No. 1 and No. In No. 7, the [P] concentration in the hot metal exceeded 0.030%. No. Nos. 8 to 13 show the effects of the top-blown oxygen flow rate. In No. 8, the [P] concentration in the hot metal exceeded 0.030%. In No. 13, the amount of spitting exceeded 0.3 kg / t.
【００３６】No．１４〜２０は、底吹きＡｒ流量の効果
を調べたものであるが、No．１４およびはNo．２０は溶
銑中の［Ｐ］濃度が０．０３０％を超えた。No．２１〜
２６は、Ａｌ2 Ｏ3 を全く添加しなかったものである
が、全て溶銑中の［Ｐ］濃度が０．０３０％を超えた。No. Nos. 14 to 20 examined the effect of the bottom blown Ar flow rate. 14 and no. In No. 20, the [P] concentration in the hot metal exceeded 0.030%. No. 21-
In No. 26, no Al 2 O 3 was added, but the [P] concentration in the hot metal exceeded 0.030% in all cases.
【００３７】No．２７〜３３は、処理前の溶銑中の［Ｓ
ｉ］濃度を０．０５〜０．５０まで変えて実施したもの
であるが、溶銑中の［Ｐ］濃度が０．００８〜０．０１
７％と低く、かつスピッティング発生量も０．２０〜
０．２４kg/tと少量であった。No. 27 to 33 are [S] in the hot metal before the treatment.
i] The concentration was changed from 0.05 to 0.50, but the [P] concentration in the hot metal was 0.008 to 0.01.
7% low and the amount of spitting is 0.20
The amount was as small as 0.24 kg / t.
【００３８】[0038]
【発明の効果】本発明法によれば、脱Ｐ炉の耐火物溶損
を招く融点降下剤を使用することなく、約１０分の短時
間吹錬で、かつ少量のスラグで脱Ｐ処理後の溶銑中の
［Ｐ］濃度を０．０３％以下にすることができる。しか
もスピッティングの発生量も低減することができる。According to the method of the present invention, after the de-P treatment with a small amount of slag by blowing for a short time of about 10 minutes without using a melting point depressant causing refractory melting of the de-P furnace. Can be reduced to 0.03% or less. In addition, the amount of spitting can be reduced.
【図１】Ａｌ2 Ｏ3 粉の添加割合（Ａｌ2 Ｏ3 粉）／
（ＣａＯ粉）と脱Ｐ処理後の滓化度および溶銑中の
［Ｐ］濃度との関係を示すグラフである。[1] Al 2 O 3 powder addition ratio (Al 2 O 3 powder) of /
It is a graph which shows the relationship between (CaO powder), the degree of slag after P removal processing, and [P] concentration in hot metal.
【図２】鉄鉱石添加量と脱Ｐ処理後の溶銑中の［Ｐ］濃
度およびスピッティングの発生量との関係を示すグラフ
である。FIG. 2 is a graph showing the relationship between the amount of iron ore added and the [P] concentration in hot metal after de-P treatment and the amount of spitting generated.
【図３】上吹き酸素流量と脱Ｐ処理後の溶銑中の［Ｐ］
濃度およびスピッティングの発生量との関係を示すグラ
フである。Fig. 3 Flow rate of top blown oxygen and [P] in hot metal after de-P treatment
It is a graph which shows the relationship between the density | concentration and the generation amount of spitting.
【図４】底吹きＡｒ流量と脱Ｐ処理後の溶銑中の［Ｐ］
濃度との関係を示すグラフである。FIG. 4 [P] in hot metal after the bottom blown Ar flow rate and de-P treatment
It is a graph which shows the relationship with a density.
【図５】溶銑中の［Ｓｉ］濃度と脱Ｐ処理後の溶銑中の
［Ｐ］濃度との関係を示すグラフである。FIG. 5 is a graph showing the relationship between the [Si] concentration in the hot metal and the [P] concentration in the hot metal after the de-P treatment.
Claims (1)
銑に酸化鉄を添加後、上吹きランスよりＣａＯ粉および
Ａｌ2 Ｏ3 粉を含有する混合物を該溶銑に吹き付けるす
る際、該混合物のＡｌ2 Ｏ 3粉の割合がＣａＯ粉添加量
の３〜２０％であり、該溶銑１ton 当たり０. ５〜２.
０Nm3/min の酸素をキャリアーガスとして前記上吹きラ
ンスから吹き付けるとともに、前記上底吹き転炉型反応
容器の炉底から溶銑１ton 当たり０. ０５〜０. ６０Nm
3/min の攪拌用ガスを吹き込むことを特徴とする溶銑の
脱Ｐ方法。After adding iron oxide to hot metal housed in a top-bottom blown converter type reaction vessel, when blowing a mixture containing CaO powder and Al 2 O 3 powder from the top blowing lance onto the hot metal, the ratio of Al 2 O 3 powder mixture is 3-20% of CaO powder amount, solution pig iron 1ton per 0.5 to 2.
0 Nm 3 / min of oxygen is blown from the upper blowing lance as a carrier gas from the upper blowing lance, and 0.05 to 0.60 Nm per ton of hot metal from the furnace bottom of the upper bottom blowing converter type reaction vessel.
A method for removing hot metal, comprising blowing a stirring gas at a rate of 3 / min.
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|---|---|---|---|
| JP34301997A JP3297801B2 (en) | 1997-12-12 | 1997-12-12 | Hot metal removal method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34301997A JP3297801B2 (en) | 1997-12-12 | 1997-12-12 | Hot metal removal method |
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| Publication Number | Publication Date |
|---|---|
| JPH11172313A true JPH11172313A (en) | 1999-06-29 |
| JP3297801B2 JP3297801B2 (en) | 2002-07-02 |
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ID=18358317
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| Country | Link |
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