JPH0255484B2 - - Google Patents
Info
- Publication number
- JPH0255484B2 JPH0255484B2 JP31982187A JP31982187A JPH0255484B2 JP H0255484 B2 JPH0255484 B2 JP H0255484B2 JP 31982187 A JP31982187 A JP 31982187A JP 31982187 A JP31982187 A JP 31982187A JP H0255484 B2 JPH0255484 B2 JP H0255484B2
- Authority
- JP
- Japan
- Prior art keywords
- scrap
- furnace
- melting
- electric furnace
- steel
- 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 - Lifetime
Links
- 238000002844 melting Methods 0.000 claims description 34
- 230000008018 melting Effects 0.000 claims description 34
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 10
- 239000000571 coke Substances 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000003208 petroleum Substances 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
- 238000007872 degassing Methods 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
- 239000011819 refractory material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 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
- 239000003085 diluting agent Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
〔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
ラツプの溶解方法に関する。
〔従来の技術〕
従来、一般的に行われている電気炉の製鋼技術
は、鋼材スクラツプを電気炉内に装入して溶解す
るものであるが、スクラツプは嵩が大きいために
溶解によつてその容積が小となり、スクラツプを
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。
[Industrial Application Field] The present invention relates to a method for melting steel scrap using an electric furnace for metal melting. [Conventional technology] Conventionally, steel making technology using an electric furnace is a method in which steel scrap is charged into an electric furnace and melted. Its volume has become smaller, and by recharging scrap and melting it, the capacity is increased to the nominal capacity of the furnace. That is, in the conventional operation, one cycle is completed by two melting operations, for example, as shown in Table 1.
従来の電気炉操業はスラグラインおよび湯溜り
部に未溶解スクラツプが残り、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、撹拌の程峠度小さく、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。
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
撹拌効果を大きくした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ツプ溶解操業方法を提供する
ことを目的とする。
（問題点を解決するための手段）
そのため本発明は、電気炉を用いて鋼材スクラ
ツ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
用いて鋼材スクラツプを溶解し、溶鋼を電気炉に
注入することを特徴とする。
（作用）
鋼材スクラツプを電気炉で溶解精錬する際に、
まず第１回目の鋼材スクラツプを電気炉に装入し
て溶解させる。次いで第１回目と同量の鋼材スク
ラツプを第２回目の装入分として溶解させるにあ
たつて、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。これによつて電気炉中の溶鋼の
撹拌が生じ、未溶解スクラツプの溶解、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。
〔実施例〕
以下、実施例を図面を参照して説明する。
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、１は電気炉、２は電極、
３は炉床、４はスクラツプ溶湯、５は未溶解スク
ラツプ、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はスクラツプ、１７は溶鋼、１８はコークス
である。
まず第１図に示すように、炉公称容量60米ｔの
電気炉１に第１回目として30米ｔのスクラツプ４
を装入して通電し、溶解させた。溶解させるのに
30分間要した。次いで、従来第２回目に装入して
いたスクラツプ量30米ｔの内、20米ｔを装入して
通電し、スクラツ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、10分間要した。
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１において
第２回目に装入したスクラツプの差し引分10米ｔ
を装入する。装入されたコークス１８は還元材と
なつて、鋼の溶融点を下げ、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
つて石油系燃料を純酸素で燃焼させ、この火炎を
スクラツプ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、スクラツプ１６を溶解させる。
この溶解炉１１で溶解させたスクラツプの溶鋼
を、電気炉１において第２回目装入の20米ｔのス
クラツプが溶融状態となつ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。
最後に還元精錬を行い、出鋼させる。
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。
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 promotion. In addition, conventional molten steel in an electric furnace requires little stirring, is difficult to degas, and takes a long time to melt.
This results in an increase in power consumption. The present invention is intended to solve the above problems,
To provide a scrap melting operation method capable of homogenizing molten steel by increasing the stirring effect to suppress the generation of oxide scale and reduce furnace consumption, as well as shorten melting time and reduce power consumption. With the goal. (Means for Solving the Problems) Therefore, the present invention provides a method for melting steel scrap using an electric furnace, in which a bottom-blown oxygen blowing nozzle and a burner are used to melt steel scrap in a melting furnace separate from the electric furnace. It is characterized by melting and injecting the molten steel into an electric furnace. (Function) When steel scrap is melted and refined in an electric furnace,
First, the first steel scrap is charged into an electric furnace and melted. Next, when melting the same amount of steel scrap as the first charge as the second charge, about two-thirds of it 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, it shortens operating time and reduces power consumption. Since coke is used as a reducing agent,
The inside of the furnace becomes a reducing atmosphere and the oxidation heat of coke is absorbed, so the life of the furnace materials can be extended. [Example] Hereinafter, an example will be described with reference to the drawings. Figure 1 is a sectional view of an electric furnace for metal melting, and Figure 2 is a sectional view of the melting furnace. In the figure, 1 is an electric furnace, 2 is an electrode,
3 is a hearth, 4 is a scrap molten metal, 5 is unmelted scrap, 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, and 18 is coke. First, as shown in Figure 1, a scrap 4 of 30 mt is placed in an electric furnace 1 with a nominal furnace capacity of 60 mt.
was charged and energized to dissolve it. to dissolve
It took 30 minutes. Next, out of the 30 mt of scrap that was previously charged in the second round, 20 mt was charged and electricity was applied to melt the scrap until it became molten. It took 10 minutes to reach a molten state. 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 in 1.
Charge. 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 this flame onto the scrap 16, and blows oxygen and diluent gas such as air, nitrogen, argon, etc. into the porous form from the downward oxygen blowing nozzle 13 of the hearth 12. Blow through the plug to dissolve the scrap 16. The scrap molten steel 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 for adjustment. It took. Finally, reduction refining is performed and the steel is tapped. The new operation examples are summarized in Table 2 below.As is clear from the comparison with Table 1 for the conventional method, even though the amount of melting is the same, the time required can be significantly shortened, and the amount of electricity used can be significantly reduced. This also greatly contributes to savings.
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
ツプが残つていたが、溶解炉からの溶鋼装入の撹
拌に伴つて無くなり、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富み、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つ
た。
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 it disappears as the molten steel charged from the melting furnace is stirred, and the furnace volume increases. It can be used effectively, and it is advantageous for degassing and homogenizing the steel. Furthermore, the melting in the melting furnace is highly reducing and the melting temperature is lowered, which lengthens the life of the furnace material, making it possible to shorten the 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…
…スクラツプ溶湯、５……未溶解スクラツプ、１
１……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……スクラツプ、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, 1
1... Melting furnace, 12... Hearth, 13... Bottom blowing oxygen blowing nozzle, 14... Furnace lid, 15... Burner,
16...scrap, 17...molten steel, 18...coke.
Claims (1)
クラツ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
いて鋼材スクラツプを溶解し、溶鋼を電気炉に装
入することを特徴とするスクラツプ溶解方法。 ２ 電気炉とは別の溶解炉において鋼材スクラツ
プを溶解するにあたつて、該溶解炉にまずコーク
スを装入し、次いで鋼材スクラツプを装入する特
許請求の範囲第１項記載のスクラツプ溶解方法。[Scope of Claims] 1. In a scrap melting method for melting steel scrap 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 melted using an electric furnace. A scrap melting method characterized by charging the scrap into a furnace. 2. The scrap melting method according to claim 1, wherein when steel scrap is melted in a melting furnace separate from the electric furnace, coke is first charged into the melting furnace, and then steel scrap is charged. .
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 JPH01162713A (en) | 1989-06-27 |
| JPH0255484B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403293B (en) * | 1995-01-16 | 1997-12-29 | Kct Tech Gmbh | METHOD AND INSTALLATION FOR THE PRODUCTION OF ALLOY STEELS |
| KR100399229B1 (en) * | 1999-10-30 | 2003-09-22 | 주식회사 포스코 | Cold start operating method of a paused electric furnace |
| JP6911935B2 (en) * | 2017-10-23 | 2021-07-28 | 日本製鉄株式会社 | Methods for dissolving and reducing electric furnaces and iron oxide-containing iron raw materials |
-
1987
- 1987-12-17 JP JP62319821A patent/JPH01162713A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01162713A (en) | 1989-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100262876B1 (en) | Process for using slag in stainless steel production in the electric arc furnace | |
| CA2126148A1 (en) | Converter for the production of steel | |
| JPH0726318A (en) | Operation of electric furnace for steelmaking | |
| US4504308A (en) | Method of operating a metallurgical plant | |
| JPH0255484B2 (en) | ||
| JPS6250545B2 (en) | ||
| JP2000017319A (en) | Operation of arc furnace | |
| JPH0348248B2 (en) | ||
| JP2000008115A (en) | Melting of cold iron source | |
| JP3431877B2 (en) | Operating method of electric furnace and electric furnace | |
| JPH1121607A (en) | Operation of arc furnace | |
| JPS631367B2 (en) | ||
| JPH1046226A (en) | Production of low nitrogen molten steel with arc electric furnace | |
| RU2153023C1 (en) | Method of processing raw materials containing manganese with recovery of metals | |
| JPH0120208B2 (en) | ||
| KR20030054328A (en) | Molten steel manufacturing method using aluminium dross | |
| KR100887859B1 (en) | The method of manufacturing stainless steel through reduction of chromium ore | |
| JP3765092B2 (en) | Ladle stirring method for electric arc furnace hot metal | |
| JPH06940B2 (en) | Method for smelting reduction refining of high manganese iron alloy | |
| SU1708868A1 (en) | Method of producing carbon and low alloy steels in 100-ton arc furnaces | |
| SU1254023A1 (en) | Method of melting metal in electric-arc furnace | |
| JP2000345229A (en) | Method for arc-melting cold iron source | |
| JP2968142B2 (en) | How to operate a shared melting and refining furnace | |
| JPH02279983A (en) | Bottom blow-off arc furnace | |
| JP2002097512A (en) | Production method for molten steel |