JP3529641B2 - Hot metal dephosphorization treatment method - Google Patents
Hot metal dephosphorization treatment methodInfo
- Publication number
- JP3529641B2 JP3529641B2 JP27375198A JP27375198A JP3529641B2 JP 3529641 B2 JP3529641 B2 JP 3529641B2 JP 27375198 A JP27375198 A JP 27375198A JP 27375198 A JP27375198 A JP 27375198A JP 3529641 B2 JP3529641 B2 JP 3529641B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- less
- sloping
- oxygen
- slag
- 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、溶銑の脱燐処理方
法に関し、詳細には石灰分及び酸化鉄等の精錬剤を用い
て、混銑車や溶銑鍋等の溶銑予備処理容器において溶銑
中の燐を除去する脱燐工程に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dephosphorizing hot metal, and more particularly, it uses a refining agent such as lime and iron oxide to prepare hot metal in a hot metal pretreatment container such as a hot metal wheel and hot metal ladle. The present invention relates to a phosphorus removal step for removing phosphorus.
【０００２】[0002]
【従来の技術】溶銑中の燐を除去する脱燐工程は、溶銑
に石灰分及び酸化鉄等の精錬剤を供給することにより、
脱燐反応を促進して燐を除去する工程であり、混銑車や
溶銑鍋等の溶銑予備処理容器を用いる脱燐処理では、上
記精錬剤を溶銑中にインジェクションしながら、気体酸
素を上吹きするか或いはインジェクションにより供給す
るのが一般的である。2. Description of the Related Art A dephosphorization process for removing phosphorus in hot metal is performed by supplying a refining agent such as lime and iron oxide to the hot metal.
This is the step of removing phosphorus by accelerating the dephosphorization reaction.In the dephosphorization treatment using a hot metal pretreatment container such as a hot metal wheel or a hot metal ladle, the above refining agent is injected into the hot metal, and gaseous oxygen is blown upward. Alternatively, it is generally supplied by injection.
【０００３】但し、脱燐処理工程中に、溶銑上のスラグ
が泡立ち（スラグフォーミング）、スラグフォーミング
が過度になると、スラグが溶銑と共に容器外に飛び出す
スロッピングが発生することがあり、この場合には一旦
操業を止めなければならないなどの弊害を生じる。However, during the dephosphorization process, the slag on the hot metal foams (slag forming), and if the slag forming becomes excessive, the slag may fly out of the container together with the hot metal, and in this case. Causes an adverse effect such as having to stop the operation once.
【０００４】そこで、特公平７−２９６３号公報には、
ＣＯガスの発生速度に応じてスラグの組成を制御するこ
とによりスロッピングを防止する技術が開示されてい
る。但し、スラグ組成（特にＰ2 Ｏ5 ）は、脱燐処理中
に変化するうえ、リアルタイムでスラグ組成を判定でき
る技術は開発されておらず、実操業に適用することは困
難であった。Therefore, Japanese Patent Publication No. 7-2963 discloses that
A technique for preventing sloping is disclosed by controlling the composition of slag according to the generation rate of CO gas. However, the slag composition (particularly P 2 O 5 ) changes during the dephosphorization treatment, and a technique capable of determining the slag composition in real time has not been developed, and it was difficult to apply it to the actual operation.
【０００５】また、特許公報第２７１７２０３号には、
スロッピングの防止を目的として、コークス粉を使用す
る技術が提案されているが、コークス粉の使用はそれ自
体でコストアップを招くものであり、コークス粉を用い
なくともスロッピングを防止できる技術の開発が要望さ
れていた。Further, Japanese Patent Publication No. 2717203 discloses that
A technique of using coke powder has been proposed for the purpose of preventing sloping, but the use of coke powder itself causes cost increase, and a technique that can prevent sloping without using coke powder is proposed. Development was requested.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記事情に着
目してなされたものであって、スラグ組成をリアルタイ
ムで判定したり、コークス粉を用いなくとも、スロッピ
ングを防止することができ、しかも脱燐反応を高効率で
行うことのできる溶銑の脱燐処理方法を提供しようとす
るものである。DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to determine slag composition in real time and prevent sloping without using coke powder, Moreover, it is an object of the present invention to provide a method for dephosphorizing hot metal that enables the dephosphorization reaction to be performed with high efficiency.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決した本発
明とは、溶銑予備処理容器内の溶銑に石灰分及び酸化鉄
を有する精錬剤を供給すると共に、気体酸素を供給する
ことによって溶銑の脱燐処理を行う方法であって、該溶
銑予備処理容器のフリーボード容積が８ｍ３以上１０ｍ
３以下であるときは、上記酸化鉄と気体酸素の合計量に
よる総酸素供給速度を０．４５Ｎｍ3 ／分・溶銑トン以
下であって且つ可及的に高い速度に制御することによっ
て、スラグのスロッピングを防止しつつ高能率脱燐を達
成することを要旨とするものである。The present invention which has solved the above-mentioned problems is to supply a refining agent having a lime component and iron oxide to the hot metal in a hot metal pretreatment vessel, and to supply gaseous oxygen to the hot metal A method for performing dephosphorization treatment, wherein the freeboard volume of the hot metal pretreatment container is 8 m 3 or more and 10 m
When it is 3 or less, the total oxygen supply rate by the total amount of iron oxide and gaseous oxygen is controlled to 0.45 Nm 3 / min · mol ton of hot metal or less and a rate as high as possible. The gist is to achieve high efficiency dephosphorization while preventing sloping.
【０００８】また本発明は、溶銑予備処理容器内の溶銑
に石灰分及び酸化鉄を有する精錬剤を供給すると共に、
気体酸素を供給することによって溶銑の脱燐処理を行う
方法であって、該溶銑予備処理容器のフリーボード容積
が２ｍ３以上８ｍ３未満であるときには、該溶銑予備処
理容器のフリーボード容積をＡ（ｍ3 ）、総酸素供給速
度の最大値をＢ（Ｎｍ3 ／分・溶銑トン）としたとき、
下記（１）式を満足する様に、酸素を供給することによ
って、スラグのスロッピングを防止しつつ高能率脱燐を
達成することを要旨とする溶銑の脱燐処理方法も規定す
る。尚、本発明においてフリーボード容積とは、溶銑予
備処理容器内における湯面の上部空間の大きさを言う。
Ｂ≦０．０５４Ａ＋０．０１８ （但し、２≦Ａ＜８）…（１）The present invention also supplies a refining agent containing lime and iron oxide to the hot metal in the hot metal pretreatment container,
A method of performing dephosphorization of molten iron by feeding gaseous oxygen, when freeboard volume of solution pig iron pretreatment vessel is less than 2m 3 than 8m 3 is a freeboard volume of solution pig iron pretreatment vessel A (M 3 ), when the maximum value of the total oxygen supply rate is B (Nm 3 / min · ton of hot metal),
A method for dephosphorizing hot metal is also defined, which is to achieve high efficiency dephosphorization while preventing slag slag by supplying oxygen so as to satisfy the following formula (1). In the present invention, the freeboard volume refers to the size of the space above the molten metal surface in the hot metal pretreatment container. B ≦ 0.054A + 0.018 (However, 2 ≦ A <8) (1)
【０００９】[0009]
【発明の実施の形態】脱燐処理中のスロッピング発生の
問題は、その時のスラグ性状と、供給された酸素［Ｏ］
と溶銑中のカーボン［Ｃ］の反応によって発生するＣＯ
ガスの発生量と密接な関係がある。ＣＯガスは、下記の
脱炭反応によって発生し、
２Ｃ＋Ｏ2 →２ＣＯ
この反応は、酸素供給量によって決まり、脱炭最盛期に
は次の関係がある。
［ＣＯガス発生量］＝［酸素供給量］×２BEST MODE FOR CARRYING OUT THE INVENTION The problem of sloping during the dephosphorization treatment is the slag property at that time and the oxygen [O] supplied.
Generated by the reaction between carbon and carbon [C] in the hot metal
It is closely related to the amount of gas generated. CO gas is generated by the following decarburization reaction, 2C + O 2 → 2CO This reaction is determined by the oxygen supply amount, and has the following relationship during the peak decarburization period. [CO gas generation amount] = [oxygen supply amount] × 2
【００１０】この様にしてＣＯガスが脱燐反応中に多量
に発生することにより、スラグフォーミング（泡立ち）
現象は発生するものであり、このスラグフォーミングが
過度になってスラグが溶銑予備処理容器からあふれ出る
のがスロッピングである。In this way, a large amount of CO gas is generated during the dephosphorization reaction, so that slag foaming occurs.
The phenomenon occurs, and the slag forming is excessive and the slag overflows from the hot metal pretreatment container is sloping.
【００１１】本発明者らは上記の関係式から、スロッピ
ングの発生はＣＯガスの発生量と関係が深いと推定し、
数々の操業データを解析した。その結果、固体酸素源と
気体として供給された酸素の総酸素供給速度を制御する
ことによりスロッピングの発生を防止できることを突き
止め本発明に想到した。即ち、酸素源として鉄鉱石粉や
気体酸素を使用する脱燐反応において、ＣＯガスの発生
量を一定量以下に抑えるべく、ＣＯガスの発生源となる
酸素源の供給速度を抑制することで、スロッピングトラ
ブルを発生させることなく操業することを可能にしたも
のである。From the above relational expression, the present inventors presume that the occurrence of sloping is closely related to the amount of CO gas generated,
A number of operational data were analyzed. As a result, the inventors have found out that the occurrence of sloping can be prevented by controlling the total oxygen supply rate of the solid oxygen source and the oxygen supplied as a gas, and conceived the present invention. That is, in the dephosphorization reaction using iron ore powder or gaseous oxygen as the oxygen source, the supply rate of the oxygen source serving as the CO gas generation source is suppressed in order to suppress the generation amount of CO gas below a certain amount. It is possible to operate without causing roping trouble.
【００１２】図１は、実際の操業時における１回の予備
処理中に発生したスロッピングの回数と、総酸素供給速
度との関係を示すグラフである。総酸素供給速度を０．
４５以下に制御することによりスロッピングを防止でき
ることが分かる。FIG. 1 is a graph showing the relationship between the number of times sloping occurred during one pretreatment in actual operation and the total oxygen supply rate. Set the total oxygen supply rate to 0.
It can be seen that sloping can be prevented by controlling to 45 or less.
【００１３】尚、図１のデータは、フリーボード容積が
８〜１０ｍ3 程度の操業条件で得られたものであるが、
ＣＯガスの発生によってスロッピングが発生するか否か
は、フォーミングしたスラグが溶銑予備処理容器から溢
れるか否かによって決まるのであるから、溶銑予備処理
容器のフリーボード容積が十分に確保できていれば、た
とえ多少のスラグフォーミングが発生したとしても、ス
ロッピングまでは至らない。従って、上記フリーボード
容積が１０ｍ3 を超える場合には、それに応じて総酸素
供給速度を高めに設定して、脱燐反応の効率を上昇させ
ることが推奨される。The data shown in FIG. 1 was obtained under operating conditions where the freeboard volume was about 8 to 10 m 3 .
Whether or not sloping occurs due to the generation of CO gas depends on whether or not the formed slag overflows from the hot metal pretreatment container. Therefore, if the freeboard volume of the hot metal pretreatment container is sufficiently secured. , Even if some slag forming occurs, it does not reach sloping. Therefore, when the freeboard volume exceeds 10 m 3 , it is recommended that the total oxygen supply rate be set higher to increase the efficiency of the dephosphorization reaction accordingly.
【００１４】一方、フリーボード容積が８ｍ3 未満の場
合には、許容できるスラグフォーミング量が小さくな
る。図２はフリーボード容積が２〜１０ｍ3 の場合のス
ロッピング発生状況を調べた結果であり、フリーボード
容積が８ｍ3 未満の場合には、溶銑予備処理容器のフリ
ーボード容積をＡ［ｍ3 ］、総酸素供給速度の最大値を
Ｂ［Ｎｍ3 ／分・溶銑トン］としたとき、下記（１）式
を満足する様に、酸素を供給することでスロッピングを
防止できることが分かる。
Ｂ≦０．０５４Ａ＋０．０１８ …（１）On the other hand, when the freeboard volume is less than 8 m 3 , the allowable slag foaming amount becomes small. FIG. 2 is a result of examining the sloping occurrence state when the freeboard volume is 2 to 10 m 3 , and when the freeboard volume is less than 8 m 3, the freeboard volume of the hot metal pretreatment container is A [m 3 ], And supposing that the maximum value of the total oxygen supply rate is B [Nm 3 / min · hot metal ton], it can be seen that sloping can be prevented by supplying oxygen so as to satisfy the following formula (1). B ≦ 0.054A + 0.018 (1)
【００１５】尚、脱燐処理反応を効率的に進行させる上
では、総酸素供給速度は可及的に高めに設定することが
望ましく、フリーボード容積が８〜１０ｍ3 の場合に
は、０．４５Ｎｍ3 ／分・溶銑トン以下の範囲内で、
０．３５Ｎｍ3 ／分・溶銑トン以上であることが望まし
く、０．４０Ｎｍ3 ／分・溶銑トン以上であればより望
ましい。またフリーボード容積が８ｍ3 未満の場合に
は、前記（１）式の右辺である「０．０５４Ａ＋０．０
１８」の値の８０％以上であれば望ましく、９０％以上
であればより望ましい。In order to allow the dephosphorization treatment reaction to proceed efficiently, it is desirable to set the total oxygen supply rate as high as possible, and when the freeboard volume is 8 to 10 m 3 , the total oxygen supply rate is 0. Within the range of 45 Nm 3 / min / ton of hot metal,
It is desirably 0.35 nm 3 / min · hot metal ton or higher, more preferably as long as 0.40 nm 3 / min · hot metal tonnage. When the freeboard volume is less than 8 m 3 , the right side of the formula (1) is “0.054A + 0.0
18% or more of the value of "18" is desirable, and 90% or more is more desirable.
【００１６】以下、本発明を実施例によって更に詳細に
説明するが、下記実施例は本発明を限定する性質のもの
ではなく、前・後記の主旨に徴して設計変更することは
いずれも本発明の技術的範囲内に含まれるものである。Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following Examples are not intended to limit the present invention, and any modification of the design can be made in view of the gist of the preceding and the following. It is included within the technical scope of.
【００１７】[0017]
【実施例】溶銑予備処理容器として混銑車を用いて、Ｆ
ｅ2 Ｏ3 を主成分とする鉄鋼石粉と、焼石灰を溶銑中に
インジェクションしながら気体酸素を上吹きすることに
より、表１に示す種々の条件で脱燐処理を行った。結果
は、表１に併記する。[Example] Using a hot metal wheel as a hot metal pretreatment container, F
Dephosphorization treatment was performed under various conditions shown in Table 1 by injecting iron ore stone powder containing e 2 O 3 as a main component and roasted lime into hot metal while spraying gaseous oxygen upward. The results are also shown in Table 1.
【００１８】[0018]
【表１】 [Table 1]
【００１９】本発明に係る条件を満足するＮｏ．１，
３，５の操業条件では、スロッピングは発生しなかっ
た。一方、本発明に係る条件を満足しないＮｏ．２，
４，６の操業条件では、スロッピングが発生し、操業を
中断せざるを得なかった。No. 1 satisfying the conditions according to the present invention. 1,
Under the operating conditions of 3 and 5, sloping did not occur. On the other hand, No. 3 which does not satisfy the conditions according to the present invention. Two
Under the operating conditions of 4 and 6, sloping occurred and the operation had to be interrupted.
【００２０】[0020]
【発明の効果】本発明は以上の様に構成されているの
で、スラグ組成をリアルタイムで判定したり、コークス
粉を用いなくとも、スロッピングを防止することがで
き、しかも脱燐反応を高効率で行うことのできる溶銑の
脱燐処理方法が提供できることとなった。EFFECTS OF THE INVENTION Since the present invention is constituted as described above, it is possible to judge the slag composition in real time and prevent sloping without using coke powder, and also the dephosphorization reaction is highly efficient. It is now possible to provide a method for dephosphorizing hot metal that can be carried out in.
【図１】実際の操業時における１回の予備処理中に発生
したスロッピングの回数と、総酸素供給速度との関係を
示すグラフである。FIG. 1 is a graph showing the relationship between the number of times sloping occurred during one pretreatment during actual operation and the total oxygen supply rate.
【図２】図２はフリーボード容積が２〜１０ｍ3 の場合
におけるスロッピング発生状況を示すグラフである。FIG. 2 is a graph showing a sloping occurrence situation when the freeboard volume is 2 to 10 m 3 .
フロントページの続き (72)発明者 小松 助行 兵庫県加古川市金沢町１番地 株式会社 神戸製鋼所 加古川製鉄所内 (56)参考文献 特開 平３−64411（ＪＰ，Ａ) 特開 平10−183216（ＪＰ，Ａ) 特開 平４−263004（ＪＰ，Ａ) 特開 平11−323418（ＪＰ，Ａ) 特開 昭61−30614（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21C 1/02 110 Front page continuation (72) Inventor Komatsu 1st Kanazawa-machi, Kakogawa-shi, Hyogo Kobe Steel Works Kakogawa Steel Works (56) Reference JP-A-3-64411 (JP, A) JP-A-10-183216 (JP, A) JP-A-4-263004 (JP, A) JP-A-11-323418 (JP, A) JP-A-61-30614 (JP, A) (58) Fields investigated (Int. Cl. 7) , DB name) C21C 1/02 110
Claims (2)
酸化鉄を有する精錬剤を供給すると共に、気体酸素を供
給することによって溶銑の脱燐処理を行う方法であっ
て、該溶銑予備処理容器のフリーボード容積が８ｍ３以
上１０ｍ３以下であるとき、 上記酸化鉄と気体酸素の合計量による総酸素供給速度を
０．４５Ｎｍ3 ／分・溶銑トン以下であって且つ可及的
に高い速度に制御することによって、スラグのスロッピ
ングを防止しつつ高能率脱燐を達成することを特徴とす
る溶銑の脱燐処理方法。[Claim 1] A hot metal hot metal pretreatment vessel supplies refining agent with lime and iron oxide, a method of performing dephosphorization of molten iron by feeding gaseous oxygen, solution pig iron pretreatment Freeboard volume of container is 8m 3 or less
When the upper 10 m 3 or less, by controlling the total oxygen feed rate by the total amount of the iron oxide and gaseous oxygen 0.45 nm 3 / equal to or less than min-hot metal ton and the highest possible speed, slag A method for dephosphorizing hot metal, characterized in that high efficiency dephosphorization is achieved while preventing sloping of the hot metal.
酸化鉄を有する精錬剤を供給すると共に、気体酸素を供
給することによって溶銑の脱燐処理を行う方法であっ
て、該溶銑予備処理容器のフリーボード容積が２ｍ３以
上８ｍ３未満であるとき、 該 溶銑予備処理容器のフリーボード容積をＡ（ｍ3 ）、
総酸素供給速度の最大値をＢ（Ｎｍ3 ／分・溶銑トン）
としたとき、下記（１）式を満足する様に、酸素を供給
することによって、スラグのスロッピングを防止しつつ
高能率脱燐を達成することを特徴とする溶銑の脱燐処理
方法。 Ｂ≦０．０５４Ａ＋０．０１８ （但し、２≦Ａ＜８） …（１）2. The hot metal in the hot metal pretreatment container contains lime and
While supplying a refining agent containing iron oxide, it also supplies gaseous oxygen.
It is a method of dephosphorizing the hot metal by supplying
And the freeboard volume of the hot metal pretreatment container is 2 m 3 or less.
When less than the above 8m 3, a freeboard volume of the hot metal pretreatment vessel A (m 3),
The maximum value of the total oxygen supply rate is B (Nm 3 / min · hot metal ton)
Then, by supplying oxygen so as to satisfy the following equation (1), while preventing slag sloping:
A method for dephosphorizing hot metal, which achieves high efficiency dephosphorization . B ≦ 0.054A + 0.018 (however, 2 ≦ A <8) (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27375198A JP3529641B2 (en) | 1998-09-28 | 1998-09-28 | Hot metal dephosphorization treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27375198A JP3529641B2 (en) | 1998-09-28 | 1998-09-28 | Hot metal dephosphorization treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000104108A JP2000104108A (en) | 2000-04-11 |
| JP3529641B2 true JP3529641B2 (en) | 2004-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27375198A Expired - Fee Related JP3529641B2 (en) | 1998-09-28 | 1998-09-28 | Hot metal dephosphorization treatment method |
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| JP (1) | JP3529641B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220452A (en) * | 2011-06-13 | 2011-10-19 | 武汉钢铁(集团)公司 | Method for duplex dephosphorization of intermediate frequency furnace and vacuum induction furnace |
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1998
- 1998-09-28 JP JP27375198A patent/JP3529641B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220452A (en) * | 2011-06-13 | 2011-10-19 | 武汉钢铁(集团)公司 | Method for duplex dephosphorization of intermediate frequency furnace and vacuum induction furnace |
| CN102220452B (en) * | 2011-06-13 | 2012-10-31 | 武汉钢铁(集团)公司 | Method for duplex dephosphorization of intermediate frequency furnace and vacuum induction furnace |
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| Publication number | Publication date |
|---|---|
| JP2000104108A (en) | 2000-04-11 |
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