JP3470857B2 - Dephosphorization refining method of hot metal in converter type refining vessel - Google Patents
Dephosphorization refining method of hot metal in converter type refining vesselInfo
- Publication number
- JP3470857B2 JP3470857B2 JP06738897A JP6738897A JP3470857B2 JP 3470857 B2 JP3470857 B2 JP 3470857B2 JP 06738897 A JP06738897 A JP 06738897A JP 6738897 A JP6738897 A JP 6738897A JP 3470857 B2 JP3470857 B2 JP 3470857B2
- Authority
- JP
- Japan
- Prior art keywords
- refining
- hot metal
- converter
- dephosphorization
- iron
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、転炉型精錬容器に
おける溶銑の脱燐精錬に関し、従来廃棄処理しかできな
かった脱燐精錬及び／又は脱炭精錬で発生するスラグを
磁選処理した際に発生する鉄分を多く含む部分を、脱燐
精錬にリサイクルして鉄分を回収するとともに、脱燐精
錬を促進する転炉型精錬容器における溶銑の脱燐精錬を
行う方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to dephosphorization refining of hot metal in a converter-type refining vessel, and when magnetically separating slag generated in dephosphorization refining and / or decarburization refining, which can only be conventionally discarded. The present invention relates to a method of recycling a portion containing a large amount of generated iron to dephosphorization refining to recover iron and performing dephosphorization refining of hot metal in a converter-type refining vessel for promoting dephosphorization refining.
【０００２】[0002]
【従来の技術】伝統的転炉製鋼法においては、同一の転
炉において溶銑の脱燐精錬と脱炭精錬とを行なって、製
鋼工程を終了していた。しかし、近年の鋼材の品質に対
する要求が高くなる一方、連続鋳造の拡大や、真空脱ガ
ス、取鍋精錬等の溶鋼の二次精錬が普及するに伴い、転
炉における出鋼温度が上昇し、転炉に於ける脱燐能力が
低下してきた。この理由は、脱燐反応は高温ほど不利に
進行するからである。2. Description of the Related Art In the traditional converter steelmaking method, dephosphorization refining and decarburization refining of hot metal are carried out in the same converter to complete the steelmaking process. However, while the demand for the quality of steel materials has increased in recent years, with the expansion of continuous casting, vacuum degassing, and the secondary refining of molten steel such as ladle refining have become widespread, the tapping temperature in the converter rises, The dephosphorization capacity in the converter has decreased. The reason for this is that the dephosphorization reaction disadvantageously proceeds at higher temperatures.
【０００３】そこで、転炉に装入する溶銑を予め処理し
て、特に燐（Ｐ）成分をある程度除去してから転炉に装
入する溶銑予備処理法が発展してきた。この方法の一つ
として、転炉型精錬容器（以下転炉等という）におい
て、同一の転炉等において溶銑の脱燐精錬と脱炭精錬と
を行なう精錬を中止し、一の転炉等において溶銑の脱燐
を行ない、この脱燐された溶銑を他の一の転炉等に移し
て脱炭精錬を行なう製鋼法が提案されている。Therefore, a hot metal pretreatment method has been developed in which the hot metal to be charged into the converter is pretreated, and in particular, the phosphorus (P) component is removed to some extent and then charged into the converter. As one of the methods, in a converter-type refining vessel (hereinafter referred to as a converter, etc.), refining to perform dephosphorization refining and decarburization refining of hot metal in the same converter etc. is stopped, and in one converter etc. A steelmaking method has been proposed in which hot metal is dephosphorized, and the dephosphorized hot metal is transferred to another converter or the like for decarburization refining.
【０００４】かかる技術として、特開平2 −２００７１
５号公報、特公平２−１４４０４号公報、特公昭６１−
２３２４３号公報の提案がある。また、本願の発明者も
既に従来の製鋼工場を改造し、複数の転炉のそれぞれの
炉前作業床に開口部を設け、一の転炉で溶銑の脱燐精錬
をした溶湯を受湯鍋に受け、この受湯鍋を前記開口部を
通して他の一の転炉に運搬し、この転炉に装入し、ここ
で脱炭精錬を行なう精錬方法を開発している（特開平６
−４１６２４号公報）。As such a technique, Japanese Patent Laid-Open No. 2-20071
No. 5, Japanese Patent Publication No. 2-14404, Japanese Patent Publication No. 61-
There is a proposal of Japanese Patent No. 23243. In addition, the inventor of the present application has already remodeled a conventional steelmaking plant, provided openings in the front working floor of each of a plurality of converters, and used molten metal obtained by dephosphorizing and refining hot metal in one converter into a receiving pot. A refining method has been developed in which the receiving pot is transferred to another converter through the opening, charged into the converter, and then decarburized and refined therein (Japanese Patent Laid-Open No. 6-242242).
-41624).
【０００５】[0005]
【発明が解決しようとする課題】上記製鋼方法におい
て、一の転炉等で溶銑の脱燐精錬を行ない直ちに出湯
し、これを他の転炉等で脱炭精錬することが円滑な製鋼
工程上必要である。しかし、上記溶銑の脱燐精錬は低温
（１３００〜１４００℃）で行われており、スラグの円
滑な生成が遅れがちであり、脱燐精錬時間が延長する。In the above steelmaking method, it is possible to perform dephosphorization refining of hot metal in one converter or the like, immediately discharge hot water, and decarburize and refine it in another converter or the like in a steelmaking process. is necessary. However, the dephosphorization refining of the hot metal is performed at a low temperature (1300 to 1400 ° C.), the smooth generation of slag tends to be delayed, and the dephosphorization refining time is extended.
【０００６】また 脱燐精錬及び／又は脱炭精錬で発生
するスラグは共に粒鉄を含んでいるので、リサイクルす
ることが資源の有効利用という点から望ましい。そこ
で、上記通常スラグを磁選処理し、鉄分を多く含む部分
（磁選屑という）と、鉄分の少ない部分とに選別して、
前者をリサイクルしたい。しかし、脱燐精錬において発
生するスラグはＰ含有量が２〜４ｗｔ％であり、脱炭精
錬炉において使用すると溶鋼への複燐があり、リサイク
ルが不可能であった。Further, since both the slag generated in the dephosphorization refining and / or the decarburization refining contain granular iron, recycling is desirable from the viewpoint of effective use of resources. Therefore, the above-mentioned normal slag is subjected to magnetic separation treatment, and is separated into a portion containing a large amount of iron (called magnetic separation waste) and a portion containing a small amount of iron,
I want to recycle the former. However, the slag generated in the dephosphorization refining had a P content of 2 to 4 wt%, and when it was used in the decarburization refining furnace, it had multiple phosphorus in the molten steel and could not be recycled.
【０００７】また、上記磁選屑を取鍋における溶銑の予
備処理等において使用とすると鉄分が十分溶解せず、リ
サイクルが不可能であった。そこで、従来廃棄処理しか
できなかった脱燐精錬及び／又は脱炭精錬で発生するス
ラグを磁選処理し、鉄分を多く含む部分を、リサイクル
して鉄分を回収するとともに、脱燐精錬を促進する転炉
型精錬容器における溶銑の脱燐精錬を行う方法を目的と
する。[0007] Further, if the above magnetic separation waste is used for pretreatment of hot metal in a ladle, etc., iron is not sufficiently dissolved and recycling is impossible. Therefore, the slag generated in dephosphorization and / or decarburization refining, which could only be disposed of in the past, was subjected to magnetic separation treatment, and the portion containing a large amount of iron was recycled to recover the iron and the dephosphorization refining was promoted. A method for performing dephosphorization refining of hot metal in a furnace-type refining vessel.
【０００８】[0008]
【課題を解決するための手段】上記課題について種々研
究した結果、下記の発明をするに至った。第１の発明
は、下記の工程を備えたことを特徴とする転炉型精錬容
器における溶銑の脱燐精錬方法である。
（ａ）脱燐精錬及び／又は脱炭精錬で発生するスラグを
予め磁選処理して鉄分を多く含む部分と、鉄分の少ない
部分とに選別し、（ｂ）前記鉄分を多く含む部分と溶銑
とを転炉型精錬容器に装入し、脱燐精錬する。[Means for Solving the Problems] As a result of various studies on the above problems, the inventors have made the following inventions. A first invention is a method for dephosphorizing and refining hot metal in a converter-type refining vessel, characterized by comprising the following steps. (A) The slag generated in the dephosphorization refining and / or decarburization refining is preliminarily subjected to magnetic separation to be separated into a portion containing a large amount of iron and a portion containing a small amount of iron, and (b) a portion containing a large amount of iron and hot metal. Is charged into a converter-type refining vessel and dephosphorized and refined.
【０００９】 脱燐精錬及び／又は脱炭精錬で発生する
スラグは共に粒鉄を含んでいるが、予め磁選処理して鉄
分を多く含む部分を、転炉型精錬容器に装入すると、溶
銑は十分攪拌されているので容易に溶解でき、粒鉄を溶
銑として回収することができる。また、磁選屑、即ち鉄
分を多く含む部分は約５０ｗｔ％の粒鉄と溶融したＣａ
Ｏ−ＳｉＯ2−ＦｅＯ系スラグであり、適度な量の範囲
であれば脱燐精錬する転炉型精錬容器に装入すると、新
たに装入する焼石灰等の造滓剤を迅速に溶解し、スラグ
の生成を早期に達成し、終点の溶製Ｐ含有量を従来より
も低下させることができる。更に、スラグの生成を早期
に達成できるので、脱燐精錬時間を短縮することも可能
となる。Both the slag generated in the dephosphorization refining and / or the decarburization refining contain granular iron.
When a portion containing a large amount is charged into a converter-type refining vessel, the hot metal is sufficiently stirred and can be easily melted, and granular iron can be recovered as hot metal. In addition, magnetic debris, that is, a portion containing a large amount of iron, is about 50 wt% of granular iron and molten Ca.
O-SiO 2 -FeO-based slag, and when it is placed in a converter-type refining vessel for dephosphorization refining within a proper amount, it rapidly dissolves newly added slag forming agent such as burnt lime. The generation of slag can be achieved at an early stage, and the melted P content at the end point can be reduced as compared with the conventional case. Furthermore, since the generation of slag can be achieved early, it is possible to shorten the dephosphorization refining time.
【００１０】第２の発明は、前記鉄分を多く含む部分を
溶銑装入に先立ち予め転炉型精錬容器に装入することを
特徴とする転炉型精錬容器における溶銑の脱燐精錬方法
である。鉄分を多く含む部分を溶銑装入に先立ち予め脱
燐精錬する転炉型精錬容器に装入すると、スラグの生成
を最も促進できるので、吹錬初期に溶銑のＰ含有量を低
下することができる。A second aspect of the present invention is a method for dephosphorizing and refining hot metal in a converter-type refining vessel, characterized in that the portion containing a large amount of iron is charged in the converter-type refining vessel in advance before the molten iron is charged. . When a converter type refining vessel that dephosphorizes and refines a portion containing a large amount of iron prior to the molten iron charging, the slag generation can be most promoted, so that the P content of the molten pig iron can be reduced in the initial stage of blowing. .
【００１１】[0011]
【発明の実施の形態】溶銑の脱燐精錬の概要を図４にお
いて説明する。図４は溶銑３４０ｔｏｎの転炉型精錬容
器２における溶銑４の脱燐精錬の状況を概念的に示す。
溶銑装入後、ランス１２から酸素を吹錬し、所定量の焼
石灰等を装入し、ＣａＯ、ＳｉＯ2 、ＦｅＯ等を主成分
とするスラグ６を生成させ、溶銑から燐を除去する。BEST MODE FOR CARRYING OUT THE INVENTION An outline of hot metal dephosphorization refining will be described with reference to FIG. FIG. 4 conceptually shows the state of dephosphorization refining of the hot metal 4 in the converter-type refining vessel 2 of 340 ton of hot metal.
After the hot metal is charged, oxygen is blown from the lance 12 and a predetermined amount of calcined lime or the like is charged to generate a slag 6 containing CaO, SiO 2 , FeO or the like as a main component, and phosphorus is removed from the hot metal.
【００１２】本発明における溶銑の脱燐精錬の概要を図
３に示す。溶銑３４０ｔｏｎを装入後、焼石灰（４〜５
ｔｏｎ／ｃｈ），ホタル石（０．６ｔｏｎ／ｃｈ）等を
装入しながら、酸素吹錬を約１２分間行う。その後、溶
銑とスラグの分離を行うため、リンスを３分間程度行い
（装入開始からリンス終了までを脱燐精錬という）、そ
の後出湯する。出湯時間（倒炉開始から出湯終了まで）
は通常６分間程度かかる。FIG. 3 shows an outline of dephosphorization refining of hot metal in the present invention. After charging 340 tons of hot metal, burnt lime (4-5
Ton / ch), fluorspar (0.6 ton / ch), etc. are charged, and oxygen blowing is performed for about 12 minutes. After that, in order to separate hot metal and slag, rinsing is performed for about 3 minutes (the period from the start of charging to the end of rinsing is called dephosphorization refining), and then tapping is performed. Bathing time (from start of incinerator to end of bathing)
Usually takes about 6 minutes.
【００１３】本発明においては、脱燐精錬及び／又は脱
炭精錬で発生するスラグのうち前述の磁選処理した鉄分
を多く含む部分（磁選屑）を精錬中において、好ましく
は溶銑装入に先立ち予め脱燐精錬する転炉型精錬容器に
装入する。ここで、転炉型精錬容器とは、上吹き転炉、
上底吹き転炉等をいう。In the present invention, of the slag generated in the dephosphorization refining and / or the decarburization refining, the above-mentioned magnetic separation-treated portion containing a large amount of iron (magnetic separation dust) is being refined, preferably before hot metal charging. It is placed in a converter-type refining vessel for dephosphorization refining. Here, the converter type refining vessel is a top blowing converter,
Top-bottom blowing converter, etc.
【００１４】脱燐精錬において発生するスラグの成分組
成の例は下記の通りである。
Ｔ．Ｆｅ：３．２ｗｔ％， Ｃａ０：５８．５ｗｔ％
Ｓｉ０2 ：１４．６ｗｔ％， Ａｌ2 Ｏ3 ：２．７ｗｔ％
ＭｇＯ ：４．４ｗｔ％， ＭｎＯ：１．６ｗｔ％，
Ｐ：３．５ｗｔ％， An example of the component composition of slag generated in dephosphorization refining is as follows. T. Fe: 3.2wt%, Ca0: 58.5wt % Si0 2: 14.6wt%, Al 2 O 3: 2.7wt% MgO: 4.4wt%, MnO: 1.6wt%, P: 3.5wt% ，
【００１５】一方、脱炭精錬において発生するスラグの
成分組成の例は下記の通りである。
Ｔ．Ｆｅ：１８．４ｗｔ％， Ｃａ０：４３．１ｗｔ％
Ｓｉ０2 ：１０．４ｗｔ％， Ａｌ2 Ｏ3 ：１．２ｗｔ％
ＭｇＯ ：８．１ｗｔ％， ＭｎＯ：３．６８ｗｔ％，
Ｐ：１．２ｗｔ％， On the other hand, examples of the component composition of slag generated in decarburization refining are as follows. T. Fe: 18.4wt%, Ca0: 43.1wt % Si0 2: 10.4wt%, Al 2 O 3: 1.2wt% MgO: 8.1wt%, MnO: 3.68wt%, P: 1.2wt% ，
【００１６】上記のように脱燐精錬のスラグと脱炭精錬
のスラグとはＰ濃度は異なるが、本質的な相違はない。
そこで、上記スラグを個別に、又は混合して破砕し、磁
選機で選別すると粒鉄を約５０ｗｔ％を含む部分（磁選
屑）と粒鉄を含まない部分とに選別できる。As described above, although the P concentration is different between the dephosphorization slag and the decarburization slag, there is no essential difference.
Therefore, when the above slags are individually or mixed and crushed and sorted by a magnetic separator, it is possible to sort into a portion containing approximately 50 wt% of granular iron (magnetic separation dust) and a portion not containing granular iron.
【００１７】本発明においては、磁選処理した鉄分を多
く含む部分を精錬中において、好ましくは溶銑装入に先
立ち予め脱燐精錬する転炉型精錬容器に装入すると、粒
鉄を多く含む磁選屑をリサイクルすることができる。磁
選屑の装入量は熱バランスから溶銑に対して最大１５ｗ
ｔ％である。In the present invention, when the magnetically treated iron-rich portion is charged during refining, preferably in a converter-type refining vessel in which dephosphorization refining is carried out prior to hot metal charging, magnetic iron-rich scrap containing a large amount of granular iron is introduced. Can be recycled. Due to the heat balance, the maximum amount of magnetic separation dust is 15w with respect to the hot metal.
t%.
【００１８】図１には溶銑の温度との関係において磁選
処理した鉄分を多く含む部分（以下磁選屑という）を溶
銑装入に先立ち予め脱燐精錬する３４０ｔｏｎ転炉に１
３．６ｔｏｎ（溶銑に対して３．７％）転炉型精錬容器
に装入した場合と、しない場合における終点Ｐ含有量を
示す。FIG. 1 shows a 340 ton converter for dephosphorizing and refining a portion containing a large amount of iron subjected to magnetic separation in relation to the temperature of hot metal (hereinafter referred to as magnetic separation dust) prior to hot metal charging.
The end point P content in the case of charging into a converter type refining vessel of 3.6 ton (3.7% with respect to the hot metal) and in the case of not charging is shown.
【００１９】溶銑温度が１２８０℃以上では両者に差が
ない。しかし、溶銑温度が１２８０℃未満では磁選屑を
装入した場合には両者に差があり、溶銑の脱燐精錬が促
進されていることを示す。恐らく、磁選屑と共に装入さ
れたスラグが追加された焼石灰等を迅速に溶解して、ス
ラグ生成がより円滑になされ、脱燐精錬に有効に作用し
たためと推定される。溶銑の温度の変動は予想すること
が困難であるため、脱燐精錬において定常的に磁選屑を
装入することが望ましい。When the hot metal temperature is 1280 ° C. or higher, there is no difference between the two. However, when the hot metal temperature is less than 1280 ° C, there is a difference between the two when the magnetic separation dust is charged, which indicates that the dephosphorization refining of the hot metal is promoted. Probably, it is presumed that the slag that was added together with the magnetic separation dust was quickly melted to make the slag generation smoother and effectively act on the dephosphorization refining. Since it is difficult to predict the change in the temperature of the hot metal, it is desirable to constantly introduce the magnetic separation debris in the dephosphorization refining.
【００２０】図３に本発明における脱燐精錬の状況を示
す。磁選屑は望ましくは溶銑装入に先立ちスクラップと
共に装入することが、早期の滓化を促進する点から望ま
しい。しかし、酸素吹錬の前半に装入してもよい。FIG. 3 shows the state of dephosphorization refining in the present invention. It is desirable that the magnetic debris is charged together with the scrap prior to the hot metal charging from the viewpoint of promoting early slag formation. However, it may be charged in the first half of oxygen blowing.
【００２１】その他、吹錬中においては通常の脱燐精錬
を行い、焼石灰、螢石等を装入する。前述のとおり、脱
燐精錬においてはスラグフォーミングがあり、円滑な操
業が阻害されることがあるので、コークス粉等の炭素材
の装入を装入しスラグフォーミングを鎮静化させる。装
入方法は、１回に全量装入してもよいが、望ましくは、
例えば１回の装入量を０．２〜０．３ｋｇ／ｔｏｎとし
て１〜４分間に渡って分割して装入することが望まし
い。In addition, during the smelting, ordinary dephosphorization refining is performed, and roasted lime, fluorite, etc. are charged. As described above, in dephosphorization refining, there is slag forming, which may hinder smooth operation. Therefore, charging of carbonaceous material such as coke powder is added to calm slag forming. As for the charging method, the entire amount may be charged at one time, but desirably,
For example, it is desirable that the charging amount per time is 0.2 to 0.3 kg / ton and the charging is divided and carried out for 1 to 4 minutes.
【００２２】通常、脱燐精錬においては溶銑中のＰがス
ラグ中のＦｅＯと反応してスラグに吸収される。そこ
で、脱燐精錬を促進するためにはスラグ中のＦｅＯ濃度
を高くする。このため、吹錬中期に鉄鉱石或いはミルス
ケールを装入する。Usually, in dephosphorization refining, P in the hot metal reacts with FeO in the slag and is absorbed by the slag. Therefore, in order to accelerate the dephosphorization refining, the FeO concentration in the slag is increased. Therefore, iron ore or mill scale is charged in the middle of blowing.
【００２３】しかし、スラグのＦｅＯが高いと、酸素吹
錬終了後においてスラグフォーミングが大きくなる。そ
こで、そこで、本発明においては、酸素吹錬終了時刻の
５分間以前において鉄鉱石装入を行う。However, when the FeO content of the slag is high, the slag foaming becomes large after the end of oxygen blowing. Therefore, in the present invention, iron ore charging is performed 5 minutes before the oxygen blowing end time.
【００２４】[0024]
【実施例】以下本発明の実施例を示す。本発明に係る脱
燐精錬法の効果を確認するため５か月間にわたって実施
した。磁選屑の装入量は溶銑に対して２〜５ｗｔ％、平
均３．７ｗｔ％であった。各月において、１日平均３０
チャージ（ｃｈ）実施し、成分組成等については５か月
間の平均値を算出し、その操業結果を図２に示す。図２
に示す通り、脱燐精錬前における溶銑のＰは約０．１ｗ
ｔ％であるが、脱燐精錬後は約０．０１ｗｔ％に脱燐さ
れており、脱炭精錬において特に脱燐精錬をする必要が
ない。通常粗鋼のＰ含有量は０．０２ｗｔ％以下であれ
ばよいためである。鉄分の回収量は１．６ｗｔ％であ
り、それだけ粗鋼生産量の増加となった。EXAMPLES Examples of the present invention will be shown below. In order to confirm the effect of the dephosphorization refining method according to the present invention, it was carried out for 5 months. The charged amount of magnetic separation dust was 2 to 5 wt% with respect to the hot metal, and was 3.7 wt% on average. 30 per day on average each month
Charge (ch) was carried out, and the average value of the component composition and the like for 5 months was calculated, and the operation results are shown in FIG. Figure 2
As shown in, the P of hot metal before dephosphorization and refining is about 0.1 w
Although it is t%, it is dephosphorized to about 0.01 wt% after dephosphorization refining, and it is not particularly necessary to perform dephosphorization refining in decarburization refining. This is because the P content of crude steel is usually 0.02 wt% or less. The amount of iron recovered was 1.6 wt%, which increased crude steel production accordingly.
【００２５】[0025]
【発明の効果】本発明に係る溶銑の脱燐精錬を実施する
ことにより、溶銑の温度が低い場合であっても安定して
溶銑の脱燐精錬ができる。また、脱燐精錬及び／又は脱
炭精錬で発生するスラグと粒鉄をリサイクルすることが
でき、溶銑に対する溶鋼の歩留りを向上させ、製鋼工程
の経済性を高めることができる。By carrying out the dephosphorization refining of the hot metal according to the present invention, the dephosphorization refining of the hot metal can be stably performed even when the temperature of the hot metal is low. In addition, slag and granular iron generated in dephosphorization refining and / or decarburization refining can be recycled, the yield of molten steel with respect to hot metal can be improved, and the economical efficiency of the steelmaking process can be enhanced.
【図１】本発明における磁選屑の使用の有無と終点Ｐ含
有量との関係を示す図である。FIG. 1 is a diagram showing the relationship between the use or non-use of magnetic separation dust and the end point P content in the present invention.
【図２】本発明における脱燐精錬の効果をデータとして
示す図である。FIG. 2 is a diagram showing the effect of dephosphorization refining in the present invention as data.
【図３】本発明における脱燐精錬の概要を示す図であ
る。FIG. 3 is a diagram showing an outline of dephosphorization refining in the present invention.
【図４】転炉型精錬容器における溶銑の脱燐精錬の状況
を示す図である。FIG. 4 is a diagram showing a state of dephosphorization refining of hot metal in a converter-type refining vessel.
２ 転炉型精錬容器 ４ 溶銑 ６ スラグ ８ 出鋼口 １０ 炉口 １２ ランス 2 Converter type refining vessel 4 hot metal 6 slugs 8 Steel tap 10 furnace mouth 12 Lance
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小平 悟史 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (72)発明者 井澤 智生 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (56)参考文献 特開 平８−193210（ＪＰ，Ａ) 特開 平10−306305（ＪＰ，Ａ) 特開 平１−147011（ＪＰ，Ａ) 特開 昭62−171951（ＪＰ，Ａ) 特開 昭62−21735（ＪＰ，Ａ) 特公 平３−77246（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C21C 5/00 - 5/50 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kodaira 1-2, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Co., Ltd. (72) Inventor Tomio Izawa 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe (56) References JP-A-8-193210 (JP, A) JP-A-10-306305 (JP, A) JP-A-147011 (JP, A) JP-A-62-171951 (JP, A) JP 62-21735 (JP, A) JP-B 3-77246 (JP, B2) (58) Fields investigated (Int.Cl. 7 , DB name) C21C 5/00-5/50
Claims (2)
他の転炉で脱炭精錬して鋼を精錬する工程において、下
記の工程を備えたことを特徴とする転炉型精錬容器にお
ける溶銑の脱燐精錬方法。 （ａ）脱燐精錬及び／又は脱炭精錬で発生するスラグを
予め磁選処理して鉄分を多く含む部分と、鉄分の少ない
部分とに選別し、 （ｂ）前記鉄分を多く含む部分と溶銑とを転炉型精錬容
器に装入し、脱燐精錬する。下記の工程を備えたことを
特徴とする転炉の炉体寿命の延長方法。1. Dephosphorization in one converter, the dephosphorized hot metal
A method for dephosphorizing and refining molten pig iron in a converter-type refining vessel , which comprises the following steps in the step of decarburizing and refining steel in another converter. (A) The slag generated in the dephosphorization refining and / or the decarburization refining is preliminarily subjected to magnetic separation to be separated into a portion containing a large amount of iron and a portion containing a small amount of iron, and (b) a portion containing a large amount of iron and hot metal. Is charged into a converter-type refining vessel and dephosphorized and refined. A method for extending the life of a converter body, comprising the following steps.
立ち予め前記転炉型精錬容器に装入することを特徴とす
る請求項１記載の転炉型精錬容器における溶銑の脱燐精
錬方法。2. The method for dephosphorizing and refining hot metal in a converter-type refining vessel according to claim 1, wherein the portion containing a large amount of iron is charged in advance in the converter-type refining vessel before charging the hot metal. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06738897A JP3470857B2 (en) | 1997-03-05 | 1997-03-05 | Dephosphorization refining method of hot metal in converter type refining vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06738897A JP3470857B2 (en) | 1997-03-05 | 1997-03-05 | Dephosphorization refining method of hot metal in converter type refining vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10245615A JPH10245615A (en) | 1998-09-14 |
| JP3470857B2 true JP3470857B2 (en) | 2003-11-25 |
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ID=13343564
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06738897A Expired - Fee Related JP3470857B2 (en) | 1997-03-05 | 1997-03-05 | Dephosphorization refining method of hot metal in converter type refining vessel |
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| JP4360240B2 (en) | 2004-03-22 | 2009-11-11 | 日立化成工業株式会社 | Semiconductor device and multilayer substrate for semiconductor device |
| JP4701752B2 (en) * | 2005-03-04 | 2011-06-15 | Ｊｆｅスチール株式会社 | Hot metal pretreatment method |
| JP2006265623A (en) * | 2005-03-24 | 2006-10-05 | Jfe Steel Kk | Method for pre-treating molten iron |
| JP4957018B2 (en) * | 2006-03-03 | 2012-06-20 | Ｊｆｅスチール株式会社 | Method for refining molten steel |
| JP4894325B2 (en) * | 2006-03-31 | 2012-03-14 | Ｊｆｅスチール株式会社 | Hot metal dephosphorization method |
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1997
- 1997-03-05 JP JP06738897A patent/JP3470857B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JPH10245615A (en) | 1998-09-14 |
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