JPH08143928A - Method for preheating scrap by refined slag - Google Patents

Method for preheating scrap by refined slag

Info

Publication number
JPH08143928A
JPH08143928A JP30981094A JP30981094A JPH08143928A JP H08143928 A JPH08143928 A JP H08143928A JP 30981094 A JP30981094 A JP 30981094A JP 30981094 A JP30981094 A JP 30981094A JP H08143928 A JPH08143928 A JP H08143928A
Authority
JP
Japan
Prior art keywords
scrap
refining
slag
refining slag
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.)
Withdrawn
Application number
JP30981094A
Other languages
Japanese (ja)
Inventor
Kenichi Sasaki
健一 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP30981094A priority Critical patent/JPH08143928A/en
Publication of JPH08143928A publication Critical patent/JPH08143928A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Landscapes

  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

PURPOSE: To efficiently preheat scrap by separating refining slag and the scrap after heating the scrap of iron scrap, etc., brought into contact with the high temp. refining slag produced in the refining and utilizing the sensible heat of the refining slag. CONSTITUTION: The high temp. refining slag 10 produced by executing the refining treatment of molten steel in a converter 12 is discharged into a molten slag pan 14 on a carrier 15. On the other hand, the scrap 11 of iron scrap, etc., is charged into a treating vessel 16 and arranged on an inclinable tilting table 17. Successively, the high temp. refining slag 10 in the molten slag pan 14 is poured in the treating vessel 16 and brought into contact with the scrap 11 to heat the scrap 11. After heat-treating for a prescribed time, the tilting table 17 is tilted, and the refining slag 10 and the scrap 11 in the treating vessel 16 are charged into a slag separating new 18 arranged at lower side part of the tilting table 17 and separated. The separated refining slag 10 into the molten slag pan 14 and the preheated scrap 11 onto an iron scrap chute 19 above an iron scrap carriage 20 are charged, respectively and the preheated scrap 11 is carried to a steelmaking work.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は転炉、電気精錬炉内にお
いて、大量に使用される屑鉄等のスクラップを溶融精錬
スラグで効率的に加熱し、精錬に伴って発生する熱エネ
ルギーを有効に回収利用することのできる精錬スラグに
よるスクラップ予熱方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently heats a large amount of scrap scrap such as scrap iron in a converter or an electric smelting furnace with a molten smelting slag to make effective the thermal energy generated by the smelting. The present invention relates to a scrap preheating method by refining slag that can be recovered and used.

【0002】[0002]

【従来の技術】転炉、電気精錬炉等に装入される鉄源と
なる原料としては、高炉等で得られる溶融状態の銑鉄、
合金鉄及び屑鉄等のスクラップが使用される。このうち
銑鉄以外の鉄原料は、通常は冷えた状態で精錬炉内に装
入されるため、精錬処理の過程で前記銑鉄の温度を低下
させる。このため精錬処理におけるエネルギーコストが
高くなり、精錬時間も長くなるためスクラップの予熱が
必要とされている。従来、このような屑鉄等のスクラッ
プの予熱方法として、特開平1−167590号公報に
は、精錬炉から発生する高温排ガスをチャンバー内のス
クラップに送入して、前記高温排ガスとスクラップとを
チャンバー内で接触させることにより、スクラップの予
熱を行う技術が記載されている。又、特開平3−100
10号公報には、屑鉄あるいは合金鉄を分割して転炉内
に積層して、各層毎に転炉上方に設けた上吹きランスを
用いてガスを燃焼させて、前記屑鉄あるいは合金鉄を加
熱する方法が記載されている。
2. Description of the Related Art As a raw material for an iron source charged into a converter, an electric refining furnace, etc., molten pig iron obtained in a blast furnace, etc.,
Scraps such as ferroalloy and scrap iron are used. Of these, iron raw materials other than pig iron are usually charged into the refining furnace in a cold state, so that the temperature of the pig iron is lowered during the refining process. Therefore, the energy cost in the refining process becomes high and the refining time becomes long, so that the scrap must be preheated. Conventionally, as a method of preheating scrap such as scrap iron, in Japanese Patent Laid-Open No. 1-167590, high temperature exhaust gas generated from a refining furnace is fed into scrap in the chamber, and the high temperature exhaust gas and scrap are stored in the chamber. Techniques for preheating scrap by contacting within are described. Moreover, JP-A-3-100
No. 10 discloses that scrap iron or alloy iron is divided and laminated in a converter, and gas is burned by using an upper blowing lance provided above the converter for each layer to heat the scrap iron or alloy iron. How to do is described.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上述の
特開平1−167590号公報記載の技術では、予熱に
際してスクラップを保持するための専用のバケットが必
要であり、予熱された高温のスクラップには磁力が作用
しないために電磁石等では取り扱えず、スクラップを精
錬炉に装入するためには、別の運搬容器を準備しなけれ
ばならない。また、高温排ガスとスクラップとを接触さ
せるためにチャンバーの気密性が要求され、設備が大が
かりになり、しかもスクラップ運搬時の温度低下の問題
から予熱設備の立地条件に制約を受ける。
However, the technique described in Japanese Patent Laid-Open No. 1-167590 described above requires a dedicated bucket for holding scraps during preheating, and the preheated high-temperature scraps have magnetic force. Since it does not work, it cannot be handled with an electromagnet or the like, and another transport container must be prepared in order to load scrap into the refining furnace. Further, since the chamber is required to be airtight in order to bring the high temperature exhaust gas into contact with the scrap, the equipment becomes large in size, and the location condition of the preheating equipment is restricted by the problem of the temperature drop during scrap transportation.

【0004】また、特開平3−10010号公報に記載
の技術は、転炉内でスクラップの予熱を行うため、設備
上の制約及びスクラップのハンドリングの問題は軽減で
きるが、予熱用の高温ガスを別に準備する必要があり、
全体として熱エネルギーの効率化には繋がらない。さら
に、高温排ガス及びスクラップ間での熱伝達率が低いた
め、熱効率を上げることができない問題点があった。本
発明は、このような事情に鑑みてなされたもので、精錬
処理により発生する熱エネルギーの有効利用を図りつ
つ、効率的にスクラップを予熱して、スクラップ比を増
大させて、しかも工場レイアウト等の設備上の制約を受
けることが少ない溶融精錬スラグによるスクラップ予熱
方法を提供することを目的とする。
Further, in the technique disclosed in Japanese Patent Laid-Open No. 3-10010, scrap is preheated in the converter, so that problems of facility restrictions and scrap handling can be reduced, but high temperature gas for preheating is used. Need to prepare separately,
As a whole, it does not lead to efficiency improvement of heat energy. Further, since the heat transfer coefficient between the high temperature exhaust gas and the scrap is low, there is a problem that the thermal efficiency cannot be increased. The present invention has been made in view of the above circumstances, and efficiently preheats scrap by increasing the scrap ratio while effectively utilizing the thermal energy generated by the refining process, and further, the factory layout, etc. It is an object of the present invention to provide a scrap preheating method using molten smelting slag, which is less subject to facility restrictions.

【0005】[0005]

【課題を解決するための手段】前記目的に沿う請求項1
記載の精錬スラグによるスクラップ予熱方法は、精錬に
より発生する精錬スラグと、屑鉄等のスクラップとを接
触させて該スクラップを加熱した後、前記スクラップと
前記精錬スラグとを分離するように構成されている。請
求項2記載の精錬スラグによるスクラップ予熱方法は、
屑鉄等のスクラップを傾転台上に載置した処理容器に装
入して、精錬スラグを該スクラップの上から注入して、
該精錬スラグと該スクラップとを接触させて該スクラッ
プを加熱した後に、前記傾転台を傾転させてスラグ分離
網により前記スクラップと前記精錬スラグとを分離する
ように構成されている。請求項3記載の精錬スラグによ
るスクラップ予熱方法は、脱燐溶銑を処理する精錬炉に
おいて、前記脱燐溶銑の精錬後に溶鋼を排出して、精錬
スラグを前記精錬炉中に残留させ、しかる後、スクラッ
プを前記精錬炉中に投入して、前記精錬スラグと前記ス
クラップとを接触させて、該スクラップを加熱して、前
記精錬スラグを前記精錬炉から排出するように構成され
ている。ここで、脱燐溶銑とは、高炉から生産された溶
銑を高炉樋、溶銑鍋等で予備処理をして溶銑中の燐分を
0.050Wt%以下とした溶銑をいう。また、スクラッ
プには一般的なコイル状及び板状の屑鉄の他に、製鉄所
内で発生する各種の鉄源及び合金鉄等が含まれる。な
お、以下の説明において、精錬スラグとは溶融状態にあ
る精錬処理後の高温のスラグをいうものとする。
A method according to the above-mentioned object.
The scrap preheating method with the refining slag described is configured to separate the scrap and the refining slag after heating the scrap by contacting the refining slag generated by refining with scrap such as scrap iron. . The scrap preheating method by the refining slag according to claim 2,
Charge scrap such as scrap iron into a processing container placed on a tilting table, inject refining slag from above the scrap,
After the refining slag and the scrap are brought into contact with each other to heat the scrap, the tilting table is tilted to separate the scrap and the refining slag by a slag separating net. The scrap preheating method with smelting slag according to claim 3, wherein in a smelting furnace for treating dephosphorized hot metal, molten steel is discharged after smelting of the dephosphorized hot metal to leave the smelting slag in the smelting furnace, and thereafter, The scrap is put into the refining furnace, the refining slag and the scrap are brought into contact with each other, the scrap is heated, and the refining slag is discharged from the refining furnace. Here, the dephosphorized hot metal refers to hot metal produced from a blast furnace by pretreatment with a blast furnace gutter, a hot metal ladle or the like to reduce the phosphorus content in the hot metal to 0.050 Wt% or less. In addition to general coil-shaped and plate-shaped scrap iron, scrap includes various iron sources and ferro-alloys generated in the steel mill. In the following description, the refining slag means a high temperature slag after refining treatment in a molten state.

【0006】[0006]

【作用】請求項1記載の精錬スラグによるスクラップ予
熱方法においては、通常作業において、廃棄されている
精錬スラグの顕熱を利用して、スクラップを加熱し、精
錬処理で発生する熱エネルギーの有効活用を図ることが
できる。また、溶融状態のスラグは、ガスに較べて蓄熱
量が大きく、また、固体と接触させた場合の熱伝達率が
大きいために効率的なスクラップの予熱が可能となる。
そして、予熱後は、固体状態のスクラップと、液体状態
の前記精錬スラグとの分離が容易に行われる。請求項2
記載の精錬スラグによるスクラップ予熱方法において
は、屑鉄等のスクラップを傾転台上に載置した処理容器
において、精錬スラグと接触させて加熱を行ない、その
後処理容器を傾転させてスラグ分離網に投入するため
に、確実かつ簡単にスラグとスクラップとを分離でき
る。また、高温のスクラップを運搬する際には、磁気力
によってスクラップをハンドリングすることができない
問題があるが、本発明では傾転台上に載置した処理容器
を傾転させるだけの操作で、精錬スラグとスクラップの
分離を行うと同時に、スクラップの処理容器から屑鉄シ
ュートへの移送を簡単に行うことができる。
In the scrap preheating method using the refining slag according to claim 1, the sensible heat of the refining slag that has been discarded is used in normal work to heat the scrap and effectively utilize the thermal energy generated in the refining process. Can be achieved. Further, the molten slag has a large heat storage amount as compared with gas, and has a large heat transfer coefficient when brought into contact with a solid, so that efficient preheating of scrap can be performed.
After preheating, the scrap in the solid state and the refining slag in the liquid state are easily separated. Claim 2
In the scrap preheating method with the refining slag described, in the processing container on which scrap such as scrap iron is placed on the tilting table, heating is performed by contacting with the refining slag, and then the processing container is tilted to the slag separation net. The slag and scrap can be separated reliably and easily for input. Further, when transporting high-temperature scrap, there is a problem that scrap cannot be handled by magnetic force, but in the present invention, refining is performed only by tilting the processing container placed on the tilting table. At the same time as separating slag and scrap, the scrap can be easily transferred from the processing container to the scrap iron chute.

【0007】請求項3記載の精錬スラグによるスクラッ
プ予熱方法においては、脱燐処理を終えた燐分の少ない
溶銑の精錬を行うに際して、スクラップの予熱を精錬炉
中で行うことができるため、熱効率が極めて良好であ
り、スクラップと精錬スラグとの分離が不完全となって
スラグを混入させることがあるような場合でも、次の精
錬処理に悪影響を与えることがなく、しかも予熱のため
の特別な設備を要さない等の利点がある。精錬処理の過
程で溶銑中から除去された燐分はスラグ中に移行する
が、このような燐分を含むスラグを、多量に残留させた
ままで次の精錬を行うと、精錬効率を低下させ、高純度
の精錬が行えない等の悪影響を及ぼす。このため、予め
混銑車、高炉樋等で脱燐処理を行って燐分を低下させた
溶銑を精錬炉で処理する場合には、精錬処理後もスラグ
中の燐分は少なく、精錬処理後の溶鋼とスラグとの完全
な分離を必要としないため、転炉中でのスラグの分離が
可能になる。
In the scrap preheating method using the refining slag according to the third aspect, when refining the hot metal having a low phosphorus content after the dephosphorization treatment, the scrap can be preheated in the refining furnace, so that the thermal efficiency is high. It is extremely good, and even if the scrap and refining slag are incompletely separated and slag is mixed in, it does not adversely affect the next refining process and special equipment for preheating. There are advantages such as not requiring. The phosphorus content removed from the hot metal during the refining process moves into the slag, but if the next refining is performed while leaving a large amount of such slag containing phosphorus, the refining efficiency is reduced, It has an adverse effect such as refining with high purity. For this reason, when the dephosphorization treatment is performed in advance with a mixed pig iron, blast furnace gutter, etc. to treat the hot metal with reduced phosphorus content in the refining furnace, the phosphorus content in the slag is small even after the refining treatment, and Since it is not necessary to completely separate the molten steel and the slag, the slag can be separated in the converter.

【0008】また、転炉スラグのリサイクル化による、
滓化促進等の効果は従来より知られており、スクラップ
に付着した少量のスラグが転炉中へ混入しても、前記の
滓化促進につながるものであり、精錬の操業上支障とな
るものではないことは明らかである。
Further, by recycling the converter slag,
The effect of promoting slag formation has been known so far, and even if a small amount of slag adhering to scrap is mixed into the converter, it will lead to the promotion of slag formation, which will hinder the operation of refining. Obviously not.

【0009】[0009]

【実施例】続いて、添付した図面を参照しつつ、本発明
を具体化した実施例につき説明し、本発明の理解に供す
る。ここに、図1は本発明の第1の実施例に係る精錬ス
ラグによるスクラップ予熱方法を説明するフロー図、図
2は本発明の第2の実施例に係る精錬スラグによるスク
ラップ予熱方法を説明するフロー図である。
Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a flow chart for explaining a scrap preheating method with refining slag according to the first embodiment of the present invention, and FIG. 2 illustrates a scrap preheating method with refining slag according to the second embodiment of the present invention. It is a flowchart.

【0010】以下、図1に示すフロー図に従って第1の
実施例を詳述する。溶鋼処理容量300tの転炉12に
おいて、溶鋼の精錬処理を行った()後、精錬処理後
の溶鋼を溶鋼鍋13に注入する()。しかる後、転炉
12中に残留させた温度約1650℃の精錬スラグ10
の約30tを台車15上に載置した溶滓鍋14に排出す
る()。一方、別に用意した処理容器16に屑鉄等か
らなるスクラップ11約30tを秤量して装入し、処理
容器16を水平位置から70度まで傾転可能な傾転台1
7に設置する()。そして、溶滓鍋14中の温度約1
600℃の精錬スラグ10の約30tを処理容器16に
注入して、スクラップ11と精錬スラグ10とを接触さ
せてスクラップ11を加熱させる()。このようにし
て約10分間加熱した後、傾転台17を傾転させて、処
理容器16中の精錬スラグ10及びスクラップ11を傾
転台17の下方横に設けた屑鉄とスラグ分離網18に投
入して、分離された精錬スラグ10を溶滓鍋14に、予
熱された屑鉄等からなるスクラップ11を屑鉄台車20
上の屑鉄シュート19に装入した()。スラグ分離網
18は鉄製の間隔約200mmの格子状のロストルから
なり、溶融状態のスラグが通過できる構造としてある。
以上のようにして得られた約400〜600℃に予熱さ
れたスクラップ11の約30tを屑鉄シュート19を介
して温度約1000℃の転炉12に装入し、更に温度約
1350℃の溶銑約270tを投入して精錬を行った。
このようにして処理した結果、精錬に要する熱量は、精
錬スラグ10によるスクラップ11の予熱処理をしない
場合に較べて約2.5〜3.8×106 kcalの熱量
を削減することができた。また、精錬スラグの顕熱によ
り獲得した熱量を、増加分のスクラップの加熱に転換し
た場合には、スクラップ量を2.5〜3.0%増加させ
ることが可能である。
The first embodiment will be described in detail below with reference to the flow chart shown in FIG. In the converter 12 having a molten steel treatment capacity of 300 t, the molten steel is refined (), and then the refined molten steel is injected into the molten steel ladle 13 (). After that, the refining slag 10 having a temperature of about 1650 ° C. left in the converter 12
About 30 tons of is discharged to the molten slag pan 14 placed on the trolley 15 (). On the other hand, about 30 t of scrap 11 made of scrap iron or the like is weighed and loaded into a separately prepared processing container 16, and the processing table 16 can be tilted from a horizontal position to 70 degrees.
Install in 7 (). And the temperature in the ladle pan 14 is about 1
About 30 tons of the refining slag 10 at 600 ° C. is injected into the processing container 16, and the scrap 11 and the refining slag 10 are brought into contact with each other to heat the scrap 11 (). After heating for about 10 minutes in this way, the tilting table 17 is tilted so that the refining slag 10 and the scrap 11 in the processing container 16 are transferred to the scrap iron and slag separating net 18 provided below the tilting table 17. Charged and separated refining slag 10 is put in a slag pan 14, and scrap 11 made of preheated scrap iron or the like is scrap iron truck 20.
It was loaded into the scrap iron chute 19 (). The slag separating net 18 is made of iron-made lattice-shaped rostruls having a spacing of about 200 mm, and has a structure through which molten slag can pass.
About 30 tons of the scrap 11 preheated to about 400 to 600 ° C. as described above is charged into the converter 12 at a temperature of about 1000 ° C. through the scrap iron chute 19, and further about 1350 ° C. of hot metal is charged. 270 t was added for refining.
As a result of the treatment as described above, the heat quantity required for refining was reduced by about 2.5 to 3.8 × 10 6 kcal as compared with the case where the scrap 11 was not preheated by the refining slag 10. . Further, when the amount of heat obtained by the sensible heat of the refining slag is converted to the heating of the increased amount of scrap, the amount of scrap can be increased by 2.5 to 3.0%.

【0011】続いて、図2に基づいて第2の実施例につ
いて説明する。溶鋼処理容量300tの転炉12におい
て、混銑車中で脱燐処理を行って溶銑中の燐分を0.0
5Wt%以下とした脱燐溶銑285tを転炉12に装入し
て()溶鋼の精錬処理を行った()後、精錬処理後
の溶鋼を溶鋼鍋13に排出する()。しかる後、温度
約1650℃の精錬スラグ10の約15tを転炉12中
に残留させた状態で、温度約25℃のスクラップ11の
約15tを屑鉄シュート19を介して転炉12中に装入
する()。そして転炉12を揺動させることにより、
スクラップ11と精錬スラグ10とを充分に接触させて
約5分間保持して予熱()後、スクラップ11を転炉
12中に残して、精錬スラグ10を溶滓鍋14に排出す
る()。そして、温度1250℃の溶銑285tを転
炉12に装入して()、精錬処理を行った。このよう
にして処理した結果、精錬処理に要する熱量は、精錬ス
ラグ10によるスクラップ11の予熱処理をしない場合
に較べて約2.5×106 kcalの熱量を削減でき
た。
Next, a second embodiment will be described with reference to FIG. In the converter 12 with a molten steel treatment capacity of 300 t, dephosphorization treatment is performed in a hot metal car to remove phosphorus content in the hot metal to 0.0
Dephosphorized hot metal 285t of 5 Wt% or less is charged into the converter 12 (), the molten steel is refined (), and then the molten steel after the refining treatment is discharged to the molten steel ladle 13 (). Thereafter, about 15 tons of the refining slag 10 having a temperature of about 1650 ° C. is left in the converter 12, and about 15 tons of the scrap 11 at a temperature of about 25 ° C. is charged into the converter 12 via the scrap iron chute 19. To (). Then, by swinging the converter 12,
The scrap 11 and the refining slag 10 are sufficiently brought into contact with each other and held for about 5 minutes to preheat (), and then the scrap 11 is left in the converter 12 and the refining slag 10 is discharged to the slag ladle 14 (). Then, 285 t of hot metal having a temperature of 1250 ° C. was charged into the converter 12 (), and a refining process was performed. As a result of the treatment as described above, the heat quantity required for the refining treatment was reduced by about 2.5 × 10 6 kcal as compared with the case where the scrap 11 was not preheated by the refining slag 10.

【0012】[0012]

【発明の効果】上記の説明から明らかなように請求項1
記載の精錬スラグによるスクラップ予熱方法において
は、通常作業において、廃棄されている精錬スラグの顕
熱を利用することにより、スクラップを加熱し、精錬処
理で発生する熱エネルギーの有効活用を図ることがで
き、また、溶融状態のスラグは、ガスに較べて蓄熱量が
大きく、また、固体と接触させた場合の熱伝達率が大き
いために効率的なスクラップの予熱が可能であり、さら
にスクラップ量の増大を図れる利点がある。請求項2記
載の精錬スラグによるスクラップ予熱方法においては、
屑鉄等のスクラップを傾転台上に載置した処理容器中に
おいて、精錬スラグと接触させて加熱を行った後、スラ
グ分離網に投入するために、スクラップの分離及び移送
を同時に行え、確実にスラグとスクラップとを分離する
ことができる。請求項3記載の精錬スラグによるスクラ
ップ予熱方法においては、脱燐処理を行った溶銑の精錬
において、スクラップと精錬スラグを完全分離する必要
がないため、スクラップの予熱を精錬炉中で行うことが
できて、熱効率が極めて良好であり、しかも予熱のため
の特別な設備を要さないため、工場レイアウト等の設備
上の制約を受けることが少ない。
As is apparent from the above description, claim 1
In the scrap preheating method with the refining slag described, in the normal work, by utilizing the sensible heat of the refining slag that has been discarded, it is possible to heat the scrap, it is possible to effectively utilize the thermal energy generated in the refining process. Also, molten slag has a larger heat storage amount than gas and a large heat transfer coefficient when it comes into contact with solids, so efficient scrap preheating is possible, further increasing the scrap amount. There is an advantage that can be achieved. In the scrap preheating method using the refining slag according to claim 2,
In the processing container where scrap such as scrap iron is placed on the tilting table, after heating by bringing it into contact with the smelting slag, the scrap can be separated and transferred at the same time in order to put it in the slag separation network. Slag and scrap can be separated. In the method of preheating scrap with smelting slag according to claim 3, it is not necessary to completely separate the scrap and the smelting slag in the refining of the hot metal subjected to the dephosphorization treatment, and therefore the preheating of scrap can be performed in the smelting furnace. Since the thermal efficiency is extremely good and no special equipment for preheating is required, there are few restrictions on equipment such as factory layout.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1の実施例に係る精錬スラグによる
スクラップ予熱方法を説明するフロー図である。
FIG. 1 is a flow diagram illustrating a scrap preheating method using refining slag according to a first embodiment of the present invention.

【図2】本発明の第2の実施例に係る精錬スラグによる
スクラップ予熱方法を説明するフロー図である。
FIG. 2 is a flow chart illustrating a scrap preheating method using refining slag according to a second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

10 精錬スラグ 11 スクラップ 12 転炉 13 溶鋼鍋 14 溶滓鍋 15 台車 16 処理容器 17 傾転台 18 スラグ分離網 19 屑鉄シュート 20 屑鉄台車 10 Refining slag 11 Scrap 12 Converter 13 Molten steel ladle 14 Ladle ladle 15 Truck 16 Processing vessel 17 Tilt table 18 Slag separation net 19 Scrap iron chute 20 Scrap iron truck

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 精錬により発生する精錬スラグと、屑鉄
等のスクラップとを接触させて該スクラップを加熱した
後、前記スクラップと前記精錬スラグとを分離すること
を特徴とする精錬スラグによるスクラップ予熱方法。
1. A scrap preheating method using a refining slag, which comprises contacting refining slag generated by refining with scrap such as scrap iron to heat the scrap, and then separating the scrap from the refining slag. .
【請求項2】 屑鉄等のスクラップを傾転台上に載置し
た処理容器に装入して、精錬スラグを該スクラップの上
から注入して、該精錬スラグと該スクラップとを接触さ
せて該スクラップを加熱した後に、前記傾転台を傾転さ
せてスラグ分離網により前記スクラップと前記精錬スラ
グとを分離することを特徴とする精錬スラグによるスク
ラップ予熱方法。
2. A scrap container such as scrap iron is charged into a processing container placed on a tilting table, and refining slag is injected from above the scrap to bring the refining slag and the scrap into contact with each other. After the scrap is heated, the tilting table is tilted to separate the scrap and the refining slag by a slag separation net, and a scrap preheating method using refining slag.
【請求項3】 脱燐溶銑を処理する精錬炉において、前
記脱燐溶銑の精錬後に溶鋼を排出して、精錬スラグを前
記精錬炉中に残留させ、しかる後、スクラップを前記精
錬炉中に投入して、前記精錬スラグと前記スクラップと
を接触させて該スクラップを加熱して、前記精錬スラグ
を前記精錬炉から排出することを特徴とする精錬スラグ
によるスクラップ予熱方法。
3. In a refining furnace for treating dephosphorized hot metal, molten steel is discharged after refining of the dephosphorized hot metal to leave refining slag in the refining furnace, and then scrap is put into the refining furnace. Then, the refining slag and the scrap are brought into contact with each other to heat the scrap, and the refining slag is discharged from the refining furnace.
JP30981094A 1994-11-18 1994-11-18 Method for preheating scrap by refined slag Withdrawn JPH08143928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30981094A JPH08143928A (en) 1994-11-18 1994-11-18 Method for preheating scrap by refined slag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30981094A JPH08143928A (en) 1994-11-18 1994-11-18 Method for preheating scrap by refined slag

Publications (1)

Publication Number Publication Date
JPH08143928A true JPH08143928A (en) 1996-06-04

Family

ID=17997526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30981094A Withdrawn JPH08143928A (en) 1994-11-18 1994-11-18 Method for preheating scrap by refined slag

Country Status (1)

Country Link
JP (1) JPH08143928A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014068933A1 (en) * 2012-10-30 2014-05-08 Jfeスチール株式会社 Hot metal refining method
KR101489379B1 (en) * 2013-06-12 2015-02-03 주식회사 포스코 Method for treating raw material
KR101489378B1 (en) * 2013-06-12 2015-02-03 주식회사 포스코 Method for treating raw material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014068933A1 (en) * 2012-10-30 2014-05-08 Jfeスチール株式会社 Hot metal refining method
KR101489379B1 (en) * 2013-06-12 2015-02-03 주식회사 포스코 Method for treating raw material
KR101489378B1 (en) * 2013-06-12 2015-02-03 주식회사 포스코 Method for treating raw material

Similar Documents

Publication Publication Date Title
JP4060034B2 (en) Method for producing molten iron in dual furnace
EP0190313B1 (en) Method and apparatus for continuous steelmaking
RU2734853C2 (en) Cast iron production method, device for its production and cast iron produced by said method
JPH08226766A (en) Method and equipment for operating duplex container electricarc furnace
US3905589A (en) Steel production method and apparatus
JP2021134386A (en) Method for melting cold iron source with slag reduction
JPH08143928A (en) Method for preheating scrap by refined slag
JP3501293B2 (en) Steelmaking method and steelmaking equipment
JP3293383B2 (en) How to use hot metal slag
JP2006265623A (en) Method for pre-treating molten iron
JP2004143492A (en) Method of melting extra-low phosphorus stainless steel
US3439909A (en) Apparatus for preheating scrap metal
JP2804964B2 (en) Steelmaking method
JP3772918B2 (en) Dephosphorization method of hot metal in converter type refining vessel
JP4421313B2 (en) Manufacturing method of molten steel
JPH01129914A (en) Smelting reduction and refining method
RU2820427C1 (en) Liquid iron refining method
RU2824162C1 (en) Method for converter steel production
JPH0277516A (en) Method for treating steelmaking slag producing at steelmaking process
JP2768209B2 (en) Converter steelmaking plant
JPH05117739A (en) Method for melting and secondary-refining steel
US3520523A (en) Scrap preheating and charging apparatus
JP3814768B2 (en) Arc furnace operation method
JP4224910B2 (en) Hot treatment method for molten slag produced during hot metal decarburization treatment
SU1765181A1 (en) Method for melting synthetic iron

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20020205