JPH01162713A - Scrap melting method - Google Patents
Scrap melting methodInfo
- Publication number
- JPH01162713A JPH01162713A JP62319821A JP31982187A JPH01162713A JP H01162713 A JPH01162713 A JP H01162713A JP 62319821 A JP62319821 A JP 62319821A JP 31982187 A JP31982187 A JP 31982187A JP H01162713 A JPH01162713 A JP H01162713A
- Authority
- JP
- Japan
- Prior art keywords
- scrap
- furnace
- steel
- melting
- steel product
- 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.)
- Granted
Links
- 238000002844 melting Methods 0.000 title claims abstract description 39
- 230000008018 melting Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 239000000571 coke Substances 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims description 10
- 239000000446 fuel Substances 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- 239000002893 slag Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract 3
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は金属溶解用電気炉を使用する鋼材スクラップの
溶解方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for melting steel scrap using an electric furnace for metal melting.
従来、−Ｃ的に行われている電気炉の製鋼技術は、鋼材
スクラップを電気炉内に装入して溶解するものであるが
、スクラップは嵩が大きいために溶解によってその容積
が小となり、スクラップを再装入し、これを溶解するこ
とにより炉公称能力の容量とさせている。即ち、従来の
操業は、例えば第１表のごとく２回の溶解により１サイ
クルが完了する。Conventionally, the electric furnace steelmaking technology carried out in the -C method involves charging steel scrap into an electric furnace and melting it, but since the scrap is bulky, its volume is reduced by melting. The capacity of the furnace is brought up to the nominal capacity by recharging scrap and melting it. That is, in the conventional operation, one cycle is completed by two melting operations, for example, as shown in Table 1.
更にこの従来の操業方法は、第１図に示す如く電気炉ス
ラグライン湯溜り部に未溶解スクラップが約１０％残る
。Furthermore, in this conventional operating method, about 10% of unmelted scrap remains in the electric furnace slag line sump, as shown in FIG.
又スクラップの溶解時間を短縮するために、電気炉の助
燃装置として石油系燃料用バーナーを炉側壁あるいは天
井より差し込み、燃料と酸素を吹き込みその燃焼熱を利
用するものがある。In order to shorten the time required to melt scrap, some electric furnaces have an auxiliary combustion system in which a petroleum fuel burner is inserted into the furnace side wall or ceiling, fuel and oxygen are blown into the furnace, and the heat of combustion is utilized.
従来の電気炉操業はスラグラインおよび湯溜り部に未溶
解スクラップが残り、又、酸化スケールが発生しやすく
、そのため溶融酸化物を生成しやすく、このため溶解温
度の上昇を招き耐火物の損傷を促進させるという問題が
ある。更に従来の電気炉内溶鋼は、攪拌の程度が小さく
、脱ガスするのが困難であると共に、溶解時間が長くか
かり、消費電力の増大をもたらしてしまう。Conventional electric furnace operation leaves unmelted scrap in the slag line and sump, and also tends to generate oxide scale, which easily generates molten oxides, which increases melting temperature and damages refractories. There is a problem of promoting it. Further, in conventional molten steel in an electric furnace, the degree of stirring is small, it is difficult to degas, and it takes a long time to melt, resulting in an increase in power consumption.
本発明は上記問題点を解決するためのもので、酸化スケ
ールの発生を抑え、炉消耗の減少を図る撹拌効果を太き
（して溶鋼の均質化を図ると共に、溶解時間を短縮化し
、消費電力の削減を図ることが可能なスクラップ溶解操
業方法を提供することを目的とする。The present invention is intended to solve the above-mentioned problems.It suppresses the generation of oxide scale, increases the stirring effect to reduce furnace consumption, homogenizes molten steel, shortens melting time, and reduces furnace consumption. The purpose of the present invention is to provide a scrap melting operation method that can reduce power consumption.
そのため本発明は、電気炉を用いて綱材スクラップを溶
解する方法において、電気炉とは別の溶解炉において下
吹酸素吹込ノズル及びバーナーを用いて鋼材スクラップ
を溶解し、溶鋼を電気炉に注入することを特徴とする。Therefore, the present invention provides a method for melting steel scrap using an electric furnace, in which the steel scrap is melted using a bottom-blown oxygen blowing nozzle and a burner in a melting furnace separate from the electric furnace, and the molten steel is injected into the electric furnace. It is characterized by
（作用）
鋼材スクラップを電気炉で溶解精錬する際に、まず第１
回目の鋼材スクラップを電気炉に装入して溶解させる０
次いで第１回目と同量の鋼材スクラップを第２回目の装
入分として溶解させるにあたって、その２／３程度を電
気炉に装入し、半溶融状態になるまで加熱する。一方残
り１／３程度を別の溶解炉で、ガス及び石油系燃料を使
用してコークス上で溶解させ、この溶鋼を上記溶融状態
の電気炉中に加える。これによって電気炉中の溶鋼の攪
拌が生じ、未溶解スクラップの溶解、脱ガスの促進等の
効果が生じると共に、一部石油系燃料を使用するので操
業時間の短縮、消費電力の削減ができ、又還元材として
コークスを使用するので、炉内は還元雰囲気となりコー
クスの酸化熱が吸収されるので炉材の寿命を延ばすこと
ができる。(Function) When melting and refining steel scrap in an electric furnace, the first
Charge the steel scrap into the electric furnace and melt it.0
Next, when melting the same amount of steel scrap as the first charge as the second charge, about two-thirds thereof is charged into an electric furnace and heated until it becomes a semi-molten state. On the other hand, about 1/3 of the remaining steel is melted on coke in another melting furnace using gas and petroleum fuel, and this molten steel is added to the electric furnace in the molten state. This agitates the molten steel in the electric furnace, which has the effect of melting unmelted scrap and promoting degassing.In addition, since some petroleum-based fuel is used, operating time can be shortened and power consumption can be reduced. Furthermore, since coke is used as the reducing agent, the inside of the furnace becomes a reducing atmosphere and the oxidation heat of the coke is absorbed, so that the life of the furnace material can be extended.
Ｃ実施例〕 以下、実施例を図面を参照して説明する。C Example] Examples will be described below with reference to the drawings.
第１図は金属溶解用電気炉の断面図、第２図は溶解炉断
面図で、図中、ｌは電気炉、２は電極、３は炉床、４は
スクラップ溶湯、５は未溶解スクラップ、１１は溶解炉
、１２は炉床、１３は下吹酸素吹込ノズル、１４は炉蓋
、１５はバーナー、１６はスクラップ、１７は溶鋼、１
８はコークスである。Figure 1 is a sectional view of an electric furnace for metal melting, and Figure 2 is a sectional view of a melting furnace. , 11 is a melting furnace, 12 is a hearth, 13 is a downward blowing oxygen blowing nozzle, 14 is a furnace lid, 15 is a burner, 16 is scrap, 17 is molten steel, 1
8 is coke.
まず第１図に示すように、炉公称容量６０米ｔの電気炉
ｌに第１回目として３０米ｔのスクラップ４を装入して
通電し、溶解させた。溶解させるのに３００分間要た。First, as shown in FIG. 1, for the first time, 30 mt of scrap 4 was charged into an electric furnace I having a nominal furnace capacity of 60 mt, and electricity was applied to melt it. It took 300 minutes to dissolve.
次いで、従来第２回目に装入していたスクラップ量３０
米ｔの内、２０米ｔを装入して通電し、スクラップが溶
融状態となるまで溶解させる。溶融状態となるまでに、
１００分間要た。Next, the amount of scrap that was conventionally charged in the second round was reduced to 30
Of the tons of rice, 20 tons are charged and energized to melt the scrap until it becomes molten. By the time it reaches a molten state,
It took 100 minutes.
一方、第２図示すように炉床１２に下吹酸素吹込ノズル
１３を設けると共に、炉蓋１４よりバーナー１５を挿入
した別の溶解炉１１に、まずコークス１８を装入し、次
いで上記電気炉ｌにおいて第２回目に装入したスクラッ
プの差し引分１０米ｔを装入する。装入されたコークス
１８は還元材となって、鋼の熔融点を下げ、炉耐火物寿
命に好結果を与えるものである。そしてバーナー１５に
よって石油系燃料を純酸素で燃焼させ、その火炎をスク
ラップ１６に吹きつけると共に、炉床１２の下吹酸素吹
込ノズル１３から酸素及び空気、窒素、アルゴン等の希
釈ガスをポーラスプラグを介して吹き込み、スクラップ
１６を溶解させる。On the other hand, as shown in FIG. 2, coke 18 is first charged into another melting furnace 11 in which a downward blowing oxygen blowing nozzle 13 is provided on the hearth 12 and a burner 15 is inserted from the furnace lid 14, and then coke 18 is charged into the electric furnace. 10 US tons of scrap charged for the second time is charged. The charged coke 18 acts as a reducing agent, lowers the melting point of the steel, and has a favorable effect on the life of the furnace refractories. Then, the burner 15 burns the petroleum fuel with pure oxygen, blows the flame onto the scrap 16, and at the same time blows oxygen and diluting gas such as air, nitrogen, argon, etc. into the porous plug from the downward oxygen blowing nozzle 13 of the hearth 12. to dissolve the scrap 16.
この溶解炉１１で溶解させたスクラップの溶鋼を、電気
炉ｌにおいて第２回目装入の２０米ｔのスクラップが溶
融状態となった時点で装入して更に通電し、調整させる
のに５分間要した。The molten steel from the scrap melted in the melting furnace 11 is charged into the electric furnace 1 when the second charge of 20 mt of scrap becomes molten, and electricity is further applied for 5 minutes to adjust the molten steel. It took.
最後に還元精錬を行い、出鋼させる。Finally, reduction refining is performed and the steel is tapped.
以下、新操業例をまとめると第２表のようにな′るが、
従来方法の第１表と比較すると明らかなように、溶解量
は同じでもその要する時間は 大幅な短縮が可能であり
、電力の節減にも大きく貢献するものである。The following is a summary of new operation examples as shown in Table 2.
As is clear from a comparison with Table 1 for the conventional method, even though the amount of dissolution is the same, the time required can be significantly shortened, and this also contributes greatly to power savings.
第２表
〔発明の効果〕
以上の説明から明らかなように、本発明によれば、従来
の電気炉はスラグラインに未溶解スクラップが残ってい
たが、溶解炉からの溶ｗ４装入の撹゛拌に伴って無くな
り、炉容の有効利用が図れるし、脱ガスに有利で鋼の均
質化が図れた。又溶解炉内での溶解は還元性に冨み、溶
融温度が低下し、そのため炉材寿命が長くなり、更に操
業時間の短縮化とこれに伴う電力の削減が可能となった
。Table 2 [Effects of the Invention] As is clear from the above explanation, according to the present invention, unmelted scrap remains in the slag line in the conventional electric furnace, but the molten W4 charge from the melting furnace is It disappears with stirring, allowing effective use of the furnace volume, and is advantageous for degassing and homogenizing the steel. In addition, the melting in the melting furnace is highly reductive and the melting temperature is lowered, which lengthens the life of the furnace material, making it possible to shorten operating time and reduce power consumption accordingly.
第１図は、金属溶解用電気炉の断面図、第２図は溶解炉
断面図である。
１・・・電気炉、２・・・電極、３・・・炉床、４・・
・スクラップ溶湯、５・・・未熔解スクラップ、１１・
・・溶解炉、１２・・・炉床、１３・・・下吹酸素吹込
ノズル、１４・・・炉蓋、１５・・・バーナー、１６・
・・スクラップ、１７・・・溶鋼、１８・・・コークス
。FIG. 1 is a sectional view of an electric furnace for metal melting, and FIG. 2 is a sectional view of the melting furnace. 1... Electric furnace, 2... Electrode, 3... Hearth, 4...
・Scrap molten metal, 5... Unmelted scrap, 11.
... Melting furnace, 12 ... Hearth, 13 ... Bottom blowing oxygen blowing nozzle, 14 ... Furnace cover, 15 ... Burner, 16.
... Scrap, 17... Molten steel, 18... Coke.
Claims (2)
ップ溶解方法において、電気炉とは別の溶解炉において
下吹酸素吹込ノズル及びバーナーを用いて鋼材スクラッ
プを溶解し、溶鋼を電気炉に装入することを特徴とする
スクラップ溶解方法。(1) In a scrap melting method in which steel scrap is melted using an electric furnace, the steel scrap is melted using a bottom blowing oxygen blowing nozzle and a burner in a melting furnace separate from the electric furnace, and the molten steel is charged into the electric furnace. A scrap melting method characterized by:
溶解するにあたって、該溶解炉にまずコークスを装入し
、次いで鋼材スクラップを装入する特許請求の範囲第１
項記載のスクラップ溶解方法。(2) When steel scrap is melted in a melting furnace different from an electric furnace, coke is first charged into the melting furnace, and then steel scrap is charged into the melting furnace.
Scrap melting method described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62319821A JPH01162713A (en) | 1987-12-17 | 1987-12-17 | Scrap melting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62319821A JPH01162713A (en) | 1987-12-17 | 1987-12-17 | Scrap melting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01162713A true JPH01162713A (en) | 1989-06-27 |
| JPH0255484B2 JPH0255484B2 (en) | 1990-11-27 |
Family
ID=18114581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62319821A Granted JPH01162713A (en) | 1987-12-17 | 1987-12-17 | Scrap melting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01162713A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0721990B1 (en) * | 1995-01-16 | 2001-02-28 | VAI Technometal GmbH | Method of producing alloyed steels and arc furnace installation with positionable blowing lances therefor |
| KR100399229B1 (en) * | 1999-10-30 | 2003-09-22 | 주식회사 포스코 | Cold start operating method of a paused electric furnace |
| WO2019082762A1 (en) * | 2017-10-23 | 2019-05-02 | 新日鐵住金株式会社 | Electric furnace and method for melting and reducing iron oxide-containing iron raw material |
-
1987
- 1987-12-17 JP JP62319821A patent/JPH01162713A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0721990B1 (en) * | 1995-01-16 | 2001-02-28 | VAI Technometal GmbH | Method of producing alloyed steels and arc furnace installation with positionable blowing lances therefor |
| KR100399229B1 (en) * | 1999-10-30 | 2003-09-22 | 주식회사 포스코 | Cold start operating method of a paused electric furnace |
| WO2019082762A1 (en) * | 2017-10-23 | 2019-05-02 | 新日鐵住金株式会社 | Electric furnace and method for melting and reducing iron oxide-containing iron raw material |
| TWI693288B (en) * | 2017-10-23 | 2020-05-11 | 日商日本製鐵股份有限公司 | Electric furnace, and method for melting and reducing iron material containing iron oxide |
| JPWO2019082762A1 (en) * | 2017-10-23 | 2020-10-22 | 日本製鉄株式会社 | Method for dissolving and reducing iron oxide-containing iron raw materials in electric furnaces |
| US11536514B2 (en) | 2017-10-23 | 2022-12-27 | Nippon Steel Corporation | Electric furnace and method for melting and reducing iron oxide-containing iron raw material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0255484B2 (en) | 1990-11-27 |
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