JP2001192724A - Dephosphorization method for molten iron - Google Patents
Dephosphorization method for molten ironInfo
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- JP2001192724A JP2001192724A JP2000002708A JP2000002708A JP2001192724A JP 2001192724 A JP2001192724 A JP 2001192724A JP 2000002708 A JP2000002708 A JP 2000002708A JP 2000002708 A JP2000002708 A JP 2000002708A JP 2001192724 A JP2001192724 A JP 2001192724A
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- hot metal
- cao
- dephosphorizing
- mass
- molten iron
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、マンガン歩留まり
を向上できる溶銑の脱りん方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot metal dephosphorization method capable of improving the manganese yield.
【０００２】[0002]
【従来の技術】近年、鋼材に対する品質要求が高度化
し、低りん鋼に対する需要が増大している。これに対応
するため、溶銑脱りん法が開発された。2. Description of the Related Art In recent years, quality requirements for steel materials have become more sophisticated, and demand for low phosphorus steel has been increasing. In response, a hot metal dephosphorization method was developed.
【０００３】ＣａＯ含有脱りん剤による脱りん反応は下
記式のごとく進行する。 ３ (ＣａＯ) ＋５ (ＦｅＯ) ＋２［Ｐ］＝（３ＣａＯ・
Ｐ2 Ｏ5 ）＋５ [Ｆｅ] なお、 ( ):スラグ中、 [ ]:溶銑中をそれぞれ示す。[0003] The dephosphorization reaction with the CaO-containing dephosphorizer proceeds according to the following formula. 3 (CaO) +5 (FeO) +2 [P] = (3CaO ·
P 2 O 5 ) +5 [Fe] (): In slag, []: In hot metal.
【０００４】この溶銑脱りん処理を効果的に行うために
は、（ＣａＯ）が溶解してスラグ内に十分に存在し、脱
りん処理に必要な（ＦｅＯ）レベルが維持されることが
必要となる。[0004] In order to effectively perform the hot metal dephosphorization treatment, it is necessary that (CaO) is dissolved and sufficiently present in the slag, and that the (FeO) level required for the dephosphorization treatment is maintained. Become.
【０００５】しかし、ＣａＯの融点は、２５７０℃と高
く、ＣａＯの溶融促進のために何らかの溶融促進剤の添
加を必要とする。However, the melting point of CaO is as high as 2570 ° C., and it is necessary to add some kind of melting accelerator in order to promote the melting of CaO.
【０００６】そこで、従来より塊状の生石灰（ＣａＯ）
を用いる場合は、例えば、蛍石等のハロゲン系化合物を
溶融促進剤として併用してきた。Therefore, conventionally, massive lime (CaO)
When using, for example, a halogen-based compound such as fluorite has been used in combination as a melting promoter.
【０００７】一方、ハロゲン系化合物を含むスラグは、
耐火物溶損量を増加させるという問題がある。また、近
年、鉄鋼スラグの有効利用技術が環境問題の視点から望
まれているが、蛍石等のハロゲン系化合物の混入は、用
途が限定され好ましくない。On the other hand, slag containing a halogen compound is
There is a problem of increasing the amount of refractory erosion. In recent years, a technique for effectively utilizing steel slag has been desired from the viewpoint of environmental issues. However, the incorporation of halogen-based compounds such as fluorite is not preferable because of limited applications.
【０００８】例えば特開平８−３１１５２３号公報に
は、この問題を解決すべく蛍石等の溶融促進剤を使用し
ないで、粉状のＣａＯを上吹き酸素と共に、溶銑に吹き
付ける溶銑脱りん方法が開示されている。For example, Japanese Unexamined Patent Publication No. Hei 8-31523 discloses a method of dephosphorizing hot metal in which powdery CaO is blown onto hot metal together with oxygen that has been blown upward without using a melting accelerator such as fluorite to solve this problem. It has been disclosed.
【０００９】この方法は、上吹き酸素と底吹きガス攪拌
とを制御することにより、スラグ中の（ＦｅＯ）濃度を
適正化でき、しかも、粉状のＣａＯを使用することによ
り、反応界面の面積を増加でき、蛍石等の溶融促進剤を
使用しなくても、スラグを溶融できるとしている。According to this method, the (FeO) concentration in the slag can be optimized by controlling the top-blown oxygen and the bottom-blown gas stirring, and the area of the reaction interface can be controlled by using powdered CaO. Slag can be melted without using a melting accelerator such as fluorite.
【００１０】[0010]
【発明が解決しようとする課題】しかし、この方法で
は、溶銑中の [Ｍｎ] が酸化しやすくなり、その結果転
炉吹錬後の溶鋼中[Ｍｎ]濃度を所定濃度以上に維持する
ために、高価なフェロマンガンや金属Ｍｎを過剰に添加
することが必要となり、マンガン添加量の低減技術が求
められていた。However, in this method, [Mn] in the hot metal is easily oxidized. As a result, the [Mn] concentration in the molten steel after the converter blowing is maintained at a predetermined level or more. In addition, it is necessary to excessively add expensive ferromanganese or metal Mn, and a technique for reducing the amount of added manganese has been required.
【００１１】高価なマンガン添加量の低減技術として
は、例えば、文献（ＣＡＭＰ−ＩＳＩＪ, ２ (１９８
９),Ｐ．１０９３）に溶銑脱りん中に安価なマンガン鉱
石を溶銑へ上置き添加して、マンガン鉱石を溶銑中の
［Ｃ］で還元することにより、溶銑中の［Ｍｎ］濃度を
所定濃度以上に維持する方法が提案されている。As a technique for reducing the amount of expensive manganese to be added, for example, a literature (CAMP-ISIJ, 2 (198)
9), p. In step 1093), inexpensive manganese ore is placed on the hot metal during hot metal dephosphorization, and the manganese ore is reduced by [C] in the hot metal to maintain the [Mn] concentration in the hot metal at or above a predetermined concentration. A method has been proposed.
【００１２】この方法の骨子は、上吹き酸素によって溶
銑中の [Ｍｎ] が酸化される量以上に、マンガン鉱石を
金属Ｍｎに還元させることにある。The essence of this method is to reduce manganese ore to metal Mn in an amount equal to or greater than the amount of [Mn] in the hot metal oxidized by the top-blown oxygen.
【００１３】しかし、この方法は、溶銑の上に添加した
マンガン鉱石の還元を促進するために、マンガン鉱石の
溶融促進剤である蛍石を使用しているため、処理容器耐
火物の溶損量が多くなるという問題点があった。However, this method uses fluorite, which is a melting promoter for manganese ore, in order to promote the reduction of manganese ore added on the hot metal. There was a problem that it increased.
【００１４】本発明の目的は、蛍石等のハロゲン系の溶
融促進剤を使用しない条件下で溶銑中の [Ｐ] 濃度を低
減することが可能であり、しかもマンガン歩留まりを向
上できる溶銑の脱りん方法を提供することにある。An object of the present invention is to reduce the [P] concentration in hot metal under conditions in which a halogen-based melting promoter such as fluorite is not used, and to remove hot metal capable of improving the manganese yield. It is to provide a phosphorus method.
【００１５】[0015]
【課題を解決するための手段】本発明者らは、種々検討
を重ねた結果、下記の知見を得た。Means for Solving the Problems The present inventors have made various studies and obtained the following findings.
【００１６】（Ａ）マンガン酸化物、例えば、二酸化マ
ンガン（以下、単にＭｎＯ2 ともいう）は本来滓化し難
いが、粉にして上吹き酸素と共に高温の溶銑表面火点付
近に吹き付けると、添加したＭｎＯ2 は溶融し易くな
る。(A) Manganese oxides, for example, manganese dioxide (hereinafter also simply referred to as MnO 2 ) are inherently difficult to form slag. MnO 2 is easily melted.
【００１７】（Ｂ）また、火点付近には溶銑中の［Ｍ
ｎ］が上吹き酸素によって酸化されて生成したマンガン
酸化物も存在する。そしてこれらのマンガン酸化物は火
点から離れてトップスラグ（溶銑表面上に浮遊している
スラグ）中に取り込まれる。(B) In the vicinity of the flash point, [M
[n] is also oxidized by the top-blown oxygen to produce manganese oxide. Then, these manganese oxides are taken away into the top slag (slag floating on the hot metal surface) away from the fire point.
【００１８】この様に、滓化したマンガン酸化物が多量
にトップスラグ中に存在するため、トップスラグ−溶銑
界面では、マンガン酸化物の溶銑中の［Ｃ］による還元
反応が促進される。As described above, since a large amount of slagged manganese oxide is present in the top slag, the reduction reaction of manganese oxide by [C] in the hot metal is promoted at the top slag-hot metal interface.
【００１９】その結果、マンガン歩留まりが向上すると
着想し、この着想を確認するためＣａＯ含有脱りん剤中
のマンガン酸化物（ここではＭｎＯ2 を用いた）の配合
量を変更した脱りん試験を行った。As a result, it was conceived that the manganese yield was improved. To confirm this idea, a dephosphorization test was conducted in which the amount of manganese oxide (here, MnO 2 was used) in the CaO-containing dephosphorizer was changed. Was.
【００２０】図１は、マンガン酸化物の配合量（ここで
は、マンガン酸化物中のマンガン純分を（Ｔ．Ｍｎ）と
して、（Ｔ．Ｍｎ）のＣａＯ基準質量比％：（Ｔ．Ｍｎ
／ＣａＯ×１００）で表す）と処理後の溶銑中の［Ｍ
ｎ］濃度との関係を示すグラフである。FIG. 1 shows the blending amount of manganese oxide (here, the pure manganese content in manganese oxide is (T.Mn), and the mass ratio of (T.Mn) based on CaO: (T.Mn)
/ CaO × 100)) and [M
[n] is a graph showing the relationship with the concentration.
【００２１】同図に示すように、溶銑中の［Ｍｎ］濃度
は、マンガン酸化物の配合量が３％から増加し、３０％
を超えるとＭｎＯ2 添加により［Ｍｎ］濃度の増加量が
むしろ低下することがわかった。[0021] As shown in the figure, the [Mn] concentration in the hot metal increases from 3% in the amount of manganese oxide to 30%.
It was found that, when MnO 2 was added, the amount of increase in the [Mn] concentration was rather reduced.
【００２２】３０％を超えると、溶銑中の［Ｍｎ］の含
有量が低下する理由は、主にマンガン酸化物とＣａＯと
の混合物の融点が高くなり、マンガン酸化物の還元効率
が低下したものと推定できる。When the content exceeds 30%, the content of [Mn] in the hot metal decreases mainly because the melting point of the mixture of manganese oxide and CaO increases and the reduction efficiency of manganese oxide decreases. Can be estimated.
【００２３】以上からＣａＯ含有脱りん剤のＣａＯに対
するマンガン酸化物の配合量は３〜３０％であることが
好ましい。From the above, it is preferable that the compounding amount of the manganese oxide with respect to CaO of the CaO-containing dephosphorizing agent is 3 to 30%.
【００２４】（Ｃ）ＣａＯ含有脱りん剤にさらにＡｌ2
Ｏ3 を添加すると、脱りん剤の融点を低下できることに
着目して、マンガン酸化物の配合量を１９％（ＭｎＯ2
を溶銑質量１トンあたり３ｋｇ添加）の一定条件下で、
Ａｌ2 Ｏ3 の配合量を変更したＡｌ2 Ｏ3 添加試験を行
った。(C) CaO-containing dephosphorizing agent is further added with Al 2
Paying attention to the fact that the addition of O 3 can lower the melting point of the dephosphorizing agent, the compounding amount of manganese oxide is reduced to 19% (MnO 2
3 kg per ton of hot metal mass)
An Al 2 O 3 addition test in which the amount of Al 2 O 3 was changed was performed.
【００２５】図２は、Ａｌ2 Ｏ3 の配合量（ＣａＯ基準
質量比％：Ａｌ2 Ｏ3 ／ＣａＯ×１００）と処理後の溶
銑中の［Ｐ］濃度との関係を示すグラフである。FIG. 2 is a graph showing the relationship between the amount of Al 2 O 3 (% by mass based on CaO: Al 2 O 3 / CaO × 100) and the [P] concentration in the hot metal after the treatment.
【００２６】同図に示すように、ＣａＯに対するＡｌ2
Ｏ3 の配合量が５％を超えると、溶銑中の［Ｐ］の濃度
は目標の０．０２５質量％（以下、単に％で質量％を表
す）以下となり、５０％を超えると目標の０．０２５％
以下に達しないことがわかった。As shown in the figure, Al for CaO 2
When the compounding amount of O 3 exceeds 5%, the concentration of [P] in the hot metal falls below the target 0.025% by mass (hereinafter, simply referred to as% by mass), and when it exceeds 50%, the target 0%. .025%
It turned out to be less than.
【００２７】以上からＣａＯに対するＡｌ2 Ｏ3 の配合
量は５〜５０％であることが好ましい。From the above, it is preferable that the compounding amount of Al 2 O 3 with respect to CaO is 5 to 50%.
【００２８】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、下記のとおりである。The present invention has been made based on the above findings, and the gist is as follows.
【００２９】（１）上底吹き転炉形式の炉に収容された
溶銑を脱りんする方法において、酸素をキャリアーガス
としてＣａＯおよびマンガン酸化物を含有する脱りん剤
を吹き付けることを特徴とする溶銑の脱りん方法。(1) A method for dephosphorizing hot metal housed in a furnace of the top-bottom blowing converter type, characterized by blowing a dephosphorizing agent containing CaO and manganese oxide using oxygen as a carrier gas. Dephosphorization method.
【００３０】（２）脱りん剤のマンガン酸化物配合量が
ＣａＯ基準質量比％（Ｔ．Ｍｎ／ＣａＯ×１００）で３
〜３０％であることを特徴とする上記（１）に記載の溶
銑の脱りん方法。(2) The content of manganese oxide in the dephosphorizing agent is 3 in terms of CaO reference mass ratio% (T.Mn/CaO×100).
The method for dephosphorizing hot metal according to the above (1), wherein the content is up to 30%.
【００３１】（３）脱りん剤のＡｌ2 Ｏ3 配合量がＣａ
Ｏ基準質量比％（Ａｌ2 Ｏ3 ／ＣａＯ×１００）で５〜
５０％であることを特徴とする上記（１）または（２）
に記載の溶銑の脱りん方法。(3) When the content of Al 2 O 3 as a dephosphorizing agent is Ca
O based mass ratio% (Al 2 O 3 / CaO × 100)
(1) or (2) above, characterized by being 50%.
3. The method for dephosphorizing hot metal according to item 1.
【００３２】（４）上吹き酸素流量が溶銑質量１トン当
たり０．５〜２．０ｍ3 （標準状態）/minであり、底吹
き攪拌ガス流量が溶銑質量１トン当たり０．０５〜０．
６０ｍ3 （標準状態）/minであることを特徴とする上記
（１）〜（３）のいずれかに記載の溶銑の脱りん方法。(4) The top blown oxygen flow rate is 0.5 to 2.0 m 3 (standard condition) / min per ton of hot metal mass, and the bottom blown stirring gas flow rate is 0.05 to 0.
The method for dephosphorizing hot metal according to any one of the above (1) to (3), wherein the rate is 60 m 3 (standard state) / min.
【００３３】[0033]
【発明の実施の形態】上底吹き転炉形式の炉で脱りん剤
を使用して脱りん処理を行うに際し、脱りん剤中に含有
させるＣａＯ量は、処理後の溶銑中の［Ｐ］濃度および
[Ｓｉ] 濃度によって異なるが、例えば、処理前の溶銑
中の［Ｐ］濃度：約０．１０％、 [Ｓｉ] 濃度：約０．
３％の場合に、溶銑中の［Ｐ］濃度を約０．０２５％ま
で低下するのに必要なＣａＯ量は溶銑質量１トン当たり
７〜１５kg程度である。DESCRIPTION OF THE PREFERRED EMBODIMENTS In performing a dephosphorization treatment using a dephosphorizing agent in a furnace of the top and bottom blown converter type, the amount of CaO contained in the dephosphorizing agent is determined by the amount of [P] in the hot metal after the treatment. Concentration and
Depending on the [Si] concentration, for example, the [P] concentration in the hot metal before the treatment is about 0.10%, and the [Si] concentration is about 0.1%.
In the case of 3%, the amount of CaO required to reduce the [P] concentration in the hot metal to about 0.025% is about 7 to 15 kg per ton of hot metal mass.
【００３４】上吹酸素と共に添加される脱りん剤を構成
する主原料のＣａＯと配合材のマンガン酸化物およびＡ
ｌ2 Ｏ3 の粒度は１５〜１５０μｍが好ましい。The main material CaO constituting the dephosphorizing agent added together with the top blowing oxygen, the manganese oxide as the compounding material and A
The particle size of l 2 O 3 is 15~150μm is preferred.
【００３５】粒度が１５μｍ未満では、破砕コストが増
大したり、粉が配管壁へ多量に付着したりするおそれが
あり、１５０μｍを超えると火点での滓化が不十分とな
るおそれがある。If the particle size is less than 15 μm, the crushing cost may increase, or a large amount of powder may adhere to the pipe wall. If the particle size exceeds 150 μm, slag formation at the flash point may be insufficient.
【００３６】ＣａＯ源としては、生石灰をはじめとして
ＣａＯを含有する石灰石等が使用できる。As the CaO source, limestone containing CaO as well as quicklime can be used.
【００３７】マンガン酸化物は、ＭｎＯ2 を含有するＭ
ｎ鉱石等が使用でき、Ａｌ2 Ｏ3 はボーキサイトをはじ
めとしてＡｌ2 Ｏ3 を含有する連続鋳造滓、造塊滓等が
使用できる。表１にＭｎ鉱石、ボーキサイトの代表的な
組成を示す。The manganese oxide is composed of MnO 2 -containing MnO 2.
n ore and the like can be used, Al 2 O 3 continuous casting slag containing Al 2 O 3 as including bauxite, ingot making slag and the like can be used. Table 1 shows typical compositions of Mn ore and bauxite.
【００３８】[0038]
【表１】 [Table 1]
【００３９】上吹き酸素流量としては溶銑質量１トン当
たり０．５〜２．０ｍ3 （標準状態）/minとするのが望
ましい。０．５ｍ3 （標準状態）/min未満では、酸素供
給不足のため脱りん速度が低下するおそれがあり、所定
の処理時間内に目標の溶銑中の[Ｐ]濃度まで低減できな
い可能性がある。また、２．０ｍ3 （標準状態）/minを
超えると、上吹き酸素の溶銑への衝突エネルギーが大き
くなりすぎて、吹錬中のスピッティング量が増大するお
それがあり好ましくない。It is desirable that the flow rate of the top blown oxygen be 0.5 to 2.0 m 3 (standard state) / min per ton of hot metal mass. If it is less than 0.5 m 3 (standard state) / min, the dephosphorization rate may decrease due to insufficient oxygen supply, and it may not be possible to reduce the target [P] concentration in the hot metal within a predetermined treatment time. . On the other hand, if it exceeds 2.0 m 3 (standard state) / min, the collision energy of the top-blown oxygen to the hot metal becomes too large, and the spitting amount during the blowing may be undesirably increased.
【００４０】炉底から吹き込む攪拌用ガスは、例えば、
Ａｒ、Ｎ2 、ＣＯ2 、ＣＯ、Ｏ2 、炭化水素等の一種な
いし２種以上を用いることができる。The stirring gas blown from the furnace bottom is, for example,
One or more of Ar, N 2 , CO 2 , CO, O 2 , and hydrocarbons can be used.
【００４１】また、攪拌ガス流量は、溶銑質量１トン当
たり、０．０５〜０．６ｍ3 （標準状態）/minが好まし
い。０．０５ｍ3 （標準状態）/min未満では、反応速度
が高くならないおそれがあり、所定の処理時間内に目標
の溶銑中の[Ｐ]濃度まで低減できない可能性がある。ま
た、０．６ｍ3 （標準状態）/minを超えると、スラグ中
の（ＦｅＯ）が溶銑中の［Ｃ］により素早く還元され、
脱りん率が低下するおそれがあるからである。The flow rate of the stirring gas is preferably 0.05 to 0.6 m 3 (standard state) / min per ton of hot metal mass. If it is less than 0.05 m 3 (standard state) / min, the reaction rate may not increase, and it may not be possible to reduce the target [P] concentration in the hot metal within a predetermined treatment time. Further, when the rate exceeds 0.6 m 3 (standard state) / min, (FeO) in slag is rapidly reduced by [C] in hot metal,
This is because the dephosphorization rate may decrease.
【００４２】このように、本発明により、酸素ガスをキ
ャリアーガスとしてＣａＯと共にマンガン酸化物粉を溶
銑に吹き付けることによりマンガン歩留まりを改善す
る、更にはＣａＯ粉、マンガン酸化物粉およびＡｌ2 Ｏ
3 粉を同時に溶銑に吹き付けることによりマンガン歩留
まりを改善すると同時に脱りん率も向上させることがで
きた。As described above, according to the present invention, the manganese oxide powder is sprayed onto the hot metal together with CaO using oxygen gas as a carrier gas to improve the manganese yield, and further, the CaO powder, manganese oxide powder and Al 2 O
The manganese yield and the dephosphorization rate could be improved by simultaneously spraying the three powders on the hot metal.
【００４３】本発明においてこのような効果が得られた
機構については、以下のように推測される。The mechanism by which such an effect is obtained in the present invention is presumed as follows.
【００４４】マンガン酸化物は本来滓化し難いが、粉に
して上吹き酸素と共に高温の火点付近に吹き付ければ、
火点の高温により滓化し易くなる。また、火点付近には
溶銑中の［Ｍｎ］が上吹き酸素によって酸化されて生成
したマンガン酸化物も存在する。そしてこれらのマンガ
ン酸化物は火点から離れてトップスラグ（溶銑表面上に
浮遊しているスラグ）中に取り込まれる。Manganese oxides are hardly turned into slag by nature, but if they are blown into powder and sprayed with high-blown oxygen near a high-temperature fire point,
It becomes easy to slag due to the high temperature of the fire point. There is also a manganese oxide generated by oxidizing [Mn] in the hot metal by the top-blown oxygen in the vicinity of the fire point. Then, these manganese oxides are taken away into the top slag (slag floating on the hot metal surface) away from the fire point.
【００４５】この様に、滓化したマンガン酸化物が多量
にトップスラグ中に存在するため、トップスラグ−溶銑
界面では、マンガン酸化物の溶銑中［Ｃ］による還元反
応が促進される。その結果、マンガン歩留まりが向上し
た可能性がある。As described above, since the slagged manganese oxide is present in a large amount in the top slag, the reduction reaction of the manganese oxide by the [C] in the hot metal is promoted at the top slag-hot metal interface. As a result, the manganese yield may have improved.
【００４６】また、ＣａＯ粉、マンガン酸化物粉にＡｌ
2 Ｏ3 粉を加えて上吹きすることにより、ＣａＯ粉の滓
化効率が向上して、マンガン歩留まりを改善すると共
に、脱Ｐ率も向上した可能性がある。Further, Al is added to CaO powder and manganese oxide powder.
By adding the 2 O 3 powder and blowing it upward, it is possible that the slagging efficiency of the CaO powder was improved, the manganese yield was improved, and the P removal ratio was also improved.
【００４７】[0047]
【実施例】脱りん処理後の溶銑中［Ｐ］濃度の目標をＡ
ｌ2 Ｏ3 無添加の場合０．０２５％以下とし、溶銑中の
[Ｍｎ] 濃度の目標を０．１５％以上とした。[Example] The target of [P] concentration in hot metal after dephosphorization was A
In the case of no l 2 O 3 addition, the content should be 0.025% or less.
The target of [Mn] concentration was set to 0.15% or more.
【００４８】（比較例１）溶銑処理前の溶銑成分が
［Ｃ］：約４．５％、［Ｓｉ］：０．２５％、［Ｐ］：
０．１０％、［Ｍｎ］：０．３０％、脱りん処理前温度
１２３０℃の、予備脱珪処理した溶銑質量２トンを、上
底吹き転炉に注銑し、炉底羽口からＡｒ：溶銑質量１ト
ン当たり０．３５ｍ3 （標準状態）/minで吹き込みなが
ら、溶銑質量１トン当たり鉄鉱石１０kgを上置き添加し
た。その後、３孔ストレートランスを用い、溶銑質量１
トン当たり１．０ｍ3 （標準状態）/minの酸素と共に、
１００メッシュアンダー（粒径１５０μｍ以下）のＣａ
Ｏ：溶銑質量１トン当たり８．１kgの脱りん剤を８分間
溶銑に吹き付けた。(Comparative Example 1) The hot metal components before the hot metal treatment were [C]: about 4.5%, [Si]: 0.25%, [P]:
0.10%, [Mn]: 0.30%, 2 tons of pre-siliconized hot metal having a temperature of 1230 ° C. before dephosphorization were poured into an upper-bottom blow converter, and Ar was injected from the bottom tuyere. : 10 kg of iron ore per ton of hot metal was added while blowing at 0.35 m 3 (standard state) / min per ton of hot metal. Then, using a 3-hole straight lance, the hot metal mass 1
With 1.0 m 3 (standard condition) / min of oxygen per ton,
Ca of 100 mesh under (particle size 150μm or less)
O: 8.1 kg of dephosphorizing agent per ton of hot metal mass was sprayed on the hot metal for 8 minutes.
【００４９】処理後の溶銑温度は１３４５℃で、、溶銑
中の [Ｐ] 濃度は０．０２５％と目標値を達成したが、
溶銑中の [Ｍｎ] 濃度は０．０７％と低く、［Ｍｎ］酸
化量が多かった。The hot metal temperature after the treatment was 1345 ° C., and the [P] concentration in the hot metal reached the target value of 0.025%.
The [Mn] concentration in the hot metal was as low as 0.07%, and the [Mn] oxidation amount was large.
【００５０】（比較例２）溶銑処理前の溶銑成分が
［Ｃ］：約４．５％、［Ｓｉ］：０．２５％、［Ｐ］：
０．１０％、［Ｍｎ］：０．３０％、脱りん処理前温度
１２３０℃の、予備脱珪処理した溶銑質量２トンを、上
底吹き転炉に注銑し、炉底羽口からＡｒ：溶銑質量１ト
ン当たり０．３５ｍ3 （標準状態）/minで吹き込みなが
ら、細粒（粒径：５〜１５mm）のＭｎＯ2 ：溶銑質量１
トン当たり３kg、鉄鉱石１０kgを上置き添加した。Comparative Example 2 Hot metal components before hot metal treatment were [C]: about 4.5%, [Si]: 0.25%, [P]:
0.10%, [Mn]: 0.30%, 2 tons of pre-siliconized hot metal having a temperature of 1230 ° C. before dephosphorization were poured into an upper-bottom blow converter, and Ar was injected from the bottom tuyere. : MnO 2 of fine grains (particle diameter: 5 to 15 mm) while blowing at 0.35 m 3 (standard condition) / min per ton of hot metal mass: hot metal mass 1
3 kg per ton and 10 kg of iron ore were added overhead.
【００５１】その後、３孔ストレートランスを用い、溶
銑質量１トン当たり１．０ｍ3 （標準状態）/minの酸素
と共に、１００メッシュアンダー（粒径１５０μｍ以
下）のＣａＯ：溶銑質量１トン当たり８．１kgの脱りん
剤を８分間溶銑に吹き付けた。Thereafter, using a three-hole straight lance, CaO under 100 mesh (particle size: 150 μm or less) with 1.0 m 3 (standard condition) / min of oxygen per ton of hot metal mass: 8. 1 kg of dephosphorizer was sprayed on the hot metal for 8 minutes.
【００５２】処理後の溶銑温度は１３４５℃で、溶銑中
の[Ｐ]濃度は０．０２５％と目標値を達成したが、溶銑
中の[Ｍｎ]濃度は０．１０％と低く、［Ｍｎ］酸化量が
多かった。The hot metal temperature after the treatment was 1345 ° C., and the [P] concentration in the hot metal achieved the target value of 0.025%, but the [Mn] concentration in the hot metal was as low as 0.10%, and the [Mn] was low. The amount of oxidation was large.
【００５３】（比較例３）溶銑処理前の溶銑成分が
［Ｃ］：約４．５％、［Ｓｉ］：０．２４％、［Ｐ］：
０．１０％、［Ｍｎ］：０．３１％、脱りん処理前温度
１２３５℃の、予備脱珪処理した溶銑質量２トンを、上
底吹き転炉に注銑し、炉底羽口からＡｒ：溶銑質量１ト
ン当たり０．３５ｍ3 （標準状態）/minで吹き込みなが
ら、溶銑質量１トン当たり鉄鉱石：１０kgを上置き添加
した。(Comparative Example 3) Hot metal components before hot metal treatment were [C]: about 4.5%, [Si]: 0.24%, [P]:
0.10%, [Mn]: 0.31%, 2 tons of pre-siliconized hot metal having a temperature before dephosphorization of 1235 ° C were poured into an upper-bottom blow converter, and Ar was passed through the bottom tuyere. : 10 kg of iron ore per ton of hot metal was added while blowing at 0.35 m 3 (standard condition) / min per ton of hot metal.
【００５４】その後、３孔ストレートランスを用い、溶
銑質量１トン当たり１．０ｍ3 （標準状態）/minの酸素
と共に、１００メッシュアンダー（粒径１５０μｍ以
下）のＣａＯ：溶銑質量１トン当たり１０kg、Ａｌ2 Ｏ
3 ：１．５kg(ＣａＯの１５％)を混合した脱りん剤を、
８分間溶銑に吹き付けた。Then, using a three-hole straight lance, CaO of 100 mesh under (particle diameter of 150 μm or less): 10 kg / ton of hot metal, with 1.0 m 3 (standard state) / min of oxygen per ton of hot metal mass Al 2 O
3 : Dephosphorizing agent mixed with 1.5 kg (15% of CaO)
The hot metal was sprayed for 8 minutes.
【００５５】処理後の溶銑温度は１３４４℃で、溶銑中
の [Ｐ] 濃度は０．０１５％と目標値を十分に達成した
が、溶銑中の [Ｍｎ] 濃度は０．０７％と低く、［Ｍ
ｎ］酸化量が多かった。The hot metal temperature after the treatment was 1344 ° C., and the [P] concentration in the hot metal sufficiently reached the target value of 0.015%, but the [Mn] concentration in the hot metal was as low as 0.07%. [M
n] The oxidation amount was large.
【００５６】（本発明例１）溶銑処理前の溶銑成分が
［Ｃ］：約４．５％、［Ｓｉ］：０．２４％、［Ｐ］：
０．１０％、［Ｍｎ］：０．２９％、脱りん処理前温度
１２３１℃の、予備脱珪処理した溶銑質量２トンを、上
底吹き転炉に注銑し、炉底羽口からＡｒ：溶銑質量１ト
ン当たり０．３５ｍ3 （標準状態）/minで吹き込みなが
ら、溶銑質量１トン当たり鉄鉱石を１０kgを上置き添加
した。その後、３孔ストレートランスを用い、溶銑質量
１トン当たり１．０ｍ3 （標準状態）/minの酸素と共
に、１００メッシュアンダー（粒径１５０μｍ以下）の
ＣａＯ：溶銑質量１トン当たり８．１kg、ＭｎＯ2 ：３
kg (ＣａＯの３０％) を混合した脱りん剤を、８分間溶
銑に吹き付けた。(Example 1 of the present invention) The hot metal component before hot metal treatment was [C]: about 4.5%, [Si]: 0.24%, [P]:
0.10%, [Mn]: 0.29%, 2 tons of pre-siliconized hot metal having a temperature before dephosphorization of 1231 ° C. were poured into an upper-bottom blow converter, and Ar was injected from the furnace bottom tuyere. : 10 kg of iron ore per 1 ton of hot metal was added while blowing at 0.35 m 3 (standard condition) / min per 1 ton of hot metal. Then, using a three-hole straight lance, CaO of 100 mesh under (particle size of 150 μm or less): Oxygen of 1.0 m 3 (standard state) / min per ton of hot metal mass: 8.1 kg per 1 ton of hot metal mass, MnO 2 : 3
kg (30% of CaO) was sprayed on the hot metal for 8 minutes.
【００５７】処理後の溶銑温度は１３４４℃で、溶銑中
の [Ｐ] 濃度は０．０２５％と目標値を達成した。更
に、溶銑中の [Ｍｎ] 濃度は０．１９％となり、［Ｍ
ｎ］酸化を大幅に抑制できマンガン歩留まりを向上でき
た。The hot metal temperature after the treatment was 1344 ° C., and the [P] concentration in the hot metal reached the target value of 0.025%. Furthermore, the [Mn] concentration in the hot metal was 0.19%, and [M
[n] Oxidation was significantly suppressed, and the manganese yield was improved.
【００５８】（本発明例２）溶銑処理前の溶銑成分が
［Ｃ］：約４．５％、［Ｓｉ］：０．２４％、［Ｐ］：
０．１０％、［Ｍｎ］：０．３０％、脱りん処理前温度
１２２５℃の、予備脱珪処理した溶銑質量２トンを、上
底吹き転炉に注銑し、炉底羽口からＡｒ：溶銑質量１ト
ン当たり０．３５ｍ3 （標準状態）/minで吹き込みなが
ら、溶銑質量１トン当たり鉄鉱石を１０kgを上置き添加
した。その後、３孔ストレートランスを用い、溶銑質量
１トン当たり１．０ｍ3 （標準状態）/minの酸素と共
に、１００メッシュアンダー（粒径１５０μｍ以下）の
ＣａＯ：溶銑質量１トン当たり１０kg、ＭｎＯ2 ：３kg
(ＣａＯの３０％)、Ａｌ2 Ｏ3 ：１．５kg (ＣａＯの１
５％) を混合した脱りん剤を,９分間溶銑に吹き付け
た。(Example 2 of the present invention) The hot metal components before hot metal processing were [C]: about 4.5%, [Si]: 0.24%, [P]:
0.10%, [Mn]: 0.30%, 2 tons of pre-siliconized hot metal having a temperature before dephosphorization of 1225 ° C. were poured into an upper-bottom blow converter, and Ar was passed through the bottom tuyere. : 10 kg of iron ore per 1 ton of hot metal was added while blowing at 0.35 m 3 (standard condition) / min per 1 ton of hot metal. Then, 3 using the hole straight lance, hot metal mass ton 1.0 m 3 with a (standard state) / min oxygen, 100 mesh-under (particle diameter 150μm or less) CaO: molten iron mass per ton 10 kg, MnO 2: 3 kg
(30% of CaO), Al 2 O 3 : 1.5 kg (1 of CaO)
5%) was sprayed on the hot metal for 9 minutes.
【００５９】処理後の溶銑温度は１３４７℃で、溶銑中
の[Ｐ]濃度は０．０１３％と目標値を十分に達成した。
更に、溶銑中の [Ｍｎ] 濃度は０．２０％となり、［Ｍ
ｎ］酸化を大幅に抑制できマンガン歩留まりを向上でき
た。The hot metal temperature after the treatment was 1347 ° C., and the [P] concentration in the hot metal was 0.013%, sufficiently achieving the target value.
Further, the [Mn] concentration in the hot metal was 0.20%, and [M
[n] Oxidation was significantly suppressed, and the manganese yield was improved.
【００６０】[0060]
【発明の効果】本発明法によれば、脱りん炉の耐火物溶
損量の増加を招くホタル石等のハロゲン系の溶融促進剤
を用いること無く、溶銑中の [Ｐ] 濃度を低減すること
が可能であり、しかもマンガン歩留まりを向上できる。According to the method of the present invention, the [P] concentration in the hot metal can be reduced without using a halogen-based melting accelerator such as fluorite which causes an increase in the amount of refractory erosion in the dephosphorization furnace. And the manganese yield can be improved.
【図１】マンガン酸化物の配合量（ＣａＯ基準質量比
％：（Ｔ．Ｍｎ／ＣａＯ×１００）と処理後の溶銑中の
［Ｍｎ］濃度との関係を示すグラフである。FIG. 1 is a graph showing the relationship between the amount of manganese oxide (% by mass based on CaO: (T.Mn/CaO×100)) and the [Mn] concentration in hot metal after treatment.
【図２】Ａｌ2 Ｏ3 の配合量（ＣａＯ基準質量比％：Ａ
ｌ2 Ｏ3 ／ＣａＯ×１００）と処理後の溶銑中の［Ｐ］
濃度との関係を示すグラフである。FIG. 2 Amount of Al 2 O 3 (% by mass based on CaO: A
l 2 O 3 / CaO × 100) and [P] in the hot metal after treatment
It is a graph which shows the relationship with a density.
Claims (4)
を脱りんする方法において、酸素をキャリアーガスとし
てＣａＯおよびマンガン酸化物を含有する脱りん剤を吹
き付けることを特徴とする溶銑の脱りん方法。1. A method for dephosphorizing hot metal stored in a furnace of the top-bottom blowing converter type, comprising blowing a dephosphorizing agent containing CaO and manganese oxide using oxygen as a carrier gas. Dephosphorization method.
Ｏ基準質量比％（Ｔ．Ｍｎ／ＣａＯ×１００）で３〜３
０％であることを特徴とする請求項１に記載の溶銑の脱
りん方法。2. The method according to claim 1, wherein the manganese oxide content of the dephosphorizing agent is Ca.
3 to 3 in terms of O-based mass ratio% (T.Mn/CaO×100)
The method for dephosphorizing hot metal according to claim 1, wherein the content is 0%.
準質量比％（Ａｌ2Ｏ3 ／ＣａＯ×１００）で５〜５０
％であることを特徴とする請求項１または２に記載の溶
銑の脱りん方法。 3. The amount of Al 2 O 3 of the dephosphorizing agent is from 5 to 50 in terms of CaO reference mass ratio% (Al 2 O 3 / CaO × 100).
%. The method for dephosphorizing hot metal according to claim 1, wherein
０．５〜２．０ｍ3（標準状態）/minであり、底吹き攪
拌ガス流量が溶銑質量１トン当たり０．０５〜０．６０
ｍ3 （標準状態）/minであることを特徴とする請求項１
〜３のいずれかに記載の溶銑の脱りん方法。4. The flow rate of the top blown oxygen is 0.5 to 2.0 m 3 (standard condition) / min per ton of hot metal mass, and the flow rate of the bottom blown stirring gas is 0.05 to 0.60 m / ton of hot metal mass.
2. The value of m 3 (standard state) / min.
4. The method for dephosphorizing hot metal according to any one of items 1 to 3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008095139A (en) * | 2006-10-11 | 2008-04-24 | Sumitomo Metal Ind Ltd | Method for improving dischargeability of slag after dephosphorization treatment, and method for dephosphorizing molten pig iron using the same |
| JP2009249723A (en) * | 2008-04-10 | 2009-10-29 | Sumitomo Metal Ind Ltd | Method for dephosphorizing molten iron |
-
2000
- 2000-01-11 JP JP2000002708A patent/JP3733819B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008095139A (en) * | 2006-10-11 | 2008-04-24 | Sumitomo Metal Ind Ltd | Method for improving dischargeability of slag after dephosphorization treatment, and method for dephosphorizing molten pig iron using the same |
| JP2009249723A (en) * | 2008-04-10 | 2009-10-29 | Sumitomo Metal Ind Ltd | Method for dephosphorizing molten iron |
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