JPS6247417A - Melt refining method for scrap - Google Patents
Melt refining method for scrapInfo
- Publication number
- JPS6247417A JPS6247417A JP60185192A JP18519285A JPS6247417A JP S6247417 A JPS6247417 A JP S6247417A JP 60185192 A JP60185192 A JP 60185192A JP 18519285 A JP18519285 A JP 18519285A JP S6247417 A JPS6247417 A JP S6247417A
- Authority
- JP
- Japan
- Prior art keywords
- scrap
- slag
- blowing
- melting
- coke
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明はスクラップの溶解精錬方法に関する。[Detailed description of the invention] Industrial applications The present invention relates to a method for melting and refining scrap.
さらに詳細には本発明は、炉底羽口と上吹ランスを備え
る複合吹錬用転炉を用いて鉄屑やステンレス鋼屑などの
スクラップを溶解精錬する方法に関する。More specifically, the present invention relates to a method for melting and refining scraps such as iron scraps and stainless steel scraps using a composite blowing converter equipped with a bottom tuyere and a top blowing lance.
従来の技術
鉄鋼業において高炉−転炉法が確立されて久しく、特に
製鋼技術は開発されつくした観がある。BACKGROUND OF THE INVENTION The blast furnace-converter process has been established in the steel industry for a long time, and steelmaking technology in particular appears to have been fully developed.
量産鋼の場合の製鋼コストは主原料費を除けばトン当た
り1000円近くなっており、今後の製鋼技術の改善に
よる量産鋼の大幅なコスト低減は極めて困難となってい
る。The cost of producing mass-produced steel is nearly 1,000 yen per ton, excluding the cost of main raw materials, making it extremely difficult to significantly reduce the cost of mass-produced steel through future improvements in steelmaking technology.
一方、主原料費は高炉設備の規模やスクラップの性状に
よってトン当たり5000円前後にものぼる価格差が存
在する。さらに世界的にもスクラップは増加傾向にあり
、特に最近では溶銑予備処理の発展に伴い転炉のスクラ
ップ配合率はさらに低下しつつある。On the other hand, the cost of main raw materials varies by around 5,000 yen per ton depending on the size of the blast furnace equipment and the properties of the scrap. Furthermore, the amount of scrap is on the rise worldwide, and in recent years, the scrap content ratio in converters has been decreasing further due to the development of hot metal pretreatment.
ここで市中老廃屑の増加予測は別にしても、スクラップ
を大量に使用する製鋼プロセスは製鋼コストを大幅に低
減゛する可能性を有し、極めて重要な開発課題である。Apart from the predicted increase in industrial waste, steelmaking processes that use large amounts of scrap have the potential to significantly reduce steelmaking costs, and are an extremely important development issue.
しかしながら、電気炉によるスクラップの溶解精錬はわ
が国の電力事情により極めて不利であり、高炉−転炉法
と比較して製鋼コストがトン当たり10000円程度の
格差がある。However, melting and refining of scrap using an electric furnace is extremely disadvantageous due to the electricity situation in Japan, and there is a difference in steel manufacturing cost of about 10,000 yen per ton compared to the blast furnace-converter method.
このような事情により、溶解熱源を電力ではなく安価な
炭材に求め、且つ急激に且つ大量に熱量を供繕できる高
送酸能力を有する転炉設備を利用してスクラップを主原
料とする製鋼技術の確立が要望されている。Due to these circumstances, steelmaking using scrap as the main raw material requires the use of cheap carbonaceous materials instead of electricity as the heat source for melting, and utilizes converter equipment with high acid delivery capacity that can rapidly supply a large amount of heat. Establishment of technology is required.
発明の解決しようとする問題点
本発明の目的は、上吹ランスと底°吹羽口を備えた既存
の複合吹錬用転炉を用いてスクラップを溶解精錬する方
法を提供することにある。Problems to be Solved by the Invention An object of the present invention is to provide a method for melting and refining scrap using an existing composite blowing converter equipped with a top blowing lance and a bottom blowing tuyere.
さらに詳細には本発明の目的は、上吹ランスと底吹羽口
を(iiffえた既存の複合吹錬用転炉を用いてスクラ
ップから高級鋼およびステンレス鋼を溶解精錬する方法
を提供することにある。More specifically, it is an object of the present invention to provide a method for melting and refining high-grade steel and stainless steel from scrap using an existing composite blowing converter equipped with a top-blowing lance and a bottom-blowing tuyere. be.
問題点を解決するための手段
上記した目的を達成するため本発明者等は実験、検討を
重ねた結果、本発明を完成したものである。Means for Solving the Problems In order to achieve the above-mentioned object, the present inventors have completed the present invention as a result of repeated experiments and studies.
本発明に従うと、炉底部にガス吹き込み羽口と炉上方に
ランスとを備える反応容器によってスクラップを溶解精
錬する方法であって、
(a) スクラップ装入に先立ち、50kg/t 〜
200kg/tのコークスを反応容器内に投入し、上記
の底吹羽口および/または上吹ランスより02を吹込み
、コークスを着火させてスクラップ溶解の火種とするこ
と、
(b) 次いで、スクラップを装入し、炭材を投入し
ながら上記の底吹羽口および上吹ランスから0□を吹き
込んで、溶解完了時にメタルが2.0%以上のCを含有
するようにスクラップを溶解すること、
(c) スクラップ溶解を完了した後、スラグの塩基
度[:aO/S+02が1.2以上となるようにスラグ
成分を調整して脱硫するとともに、底吹羽口より非酸化
性ガスを吹込みスラグ環よびメタルを攪拌してスラグ中
の(T−Fe)を3%未満とすること、
(d)・上記工程(c)の脱硫を完了した後、スラグお
よび残留炭材を除去して、得られたCが2.0%以上の
メタルを上底吹送酸することによって脱炭、脱窒素を行
うこと、
を特徴とするスクラップの溶解精錬方法が提供される。According to the present invention, there is provided a method for melting and refining scrap using a reaction vessel equipped with a gas blowing tuyere at the bottom of the furnace and a lance above the furnace, comprising: (a) prior to scrap charging, 50 kg/t ~
Putting 200 kg/t of coke into the reaction vessel, blowing 02 through the bottom blowing tuyere and/or top blowing lance to ignite the coke and use it as a spark for melting scrap; (b) Next, scrap melt the scrap so that the metal contains 2.0% or more of C by the time melting is completed by charging 0□ from the bottom blowing tuyere and top blowing lance while charging the carbonaceous material. (c) After completing the scrap melting, the slag components are adjusted so that the basicity [:aO/S+02] of the slag is 1.2 or more and desulfurization is performed, and non-oxidizing gas is blown from the bottom blowing tuyere. Stirring the slag ring and metal to reduce the (T-Fe) content in the slag to less than 3%; (d) After completing the desulfurization in step (c) above, remove the slag and residual carbonaceous material. Provided is a method for melting and refining scrap, which is characterized by: decarburizing and denitrifying the obtained metal containing 2.0% or more of C by top-bottom blowing acid.
これらのスクラップは普通鋼屑でもステンレス鋼屑でも
よい。These scraps may be ordinary steel scraps or stainless steel scraps.
皿
以下、本発明のスクラップ溶解精錬方法における条件限
定理由を説明する。The reason for limiting the conditions in the scrap melting and refining method of the present invention will be explained below.
(a)コークスの装入と着火
本発明に従うと、スクラップの装入に先立ち、50kg
/t〜200kg/tのコークスを装入する。これはコ
ークスを床敷として炉床を保護することのほか、スクラ
ップ装入前にコークスを底吹02により十分に赤化させ
て炉底部からスクラップを加熱可能とするためである。(a) Charging and ignition of coke According to the present invention, prior to charging scrap, 50 kg
/t~200kg/t of coke is charged. This is not only to protect the hearth by using coke as a bedding, but also to sufficiently redden the coke by bottom blowing 02 before charging the scrap so that the scrap can be heated from the bottom of the hearth.
このように炉底部にコークスを配置して上底吹きするこ
とによって、スクラップを上下から溶解することが可能
となる。この際に底吹02が好ましいが、炉体が十分に
予熱されているときには上吹02のみでコークスを着火
させてもよい。床敷コークス潰が50kg/を未満では
スクラップ溶解の火種とするのが困難であり、一方、コ
ークスは高価な炭材であるので200kg/tを超える
量の床敷コークスを用いると不経済である。従って、床
敷コークスの装入量を50kg/t〜200kg/tと
した。By disposing coke at the bottom of the furnace and blowing it from the top, scrap can be melted from above and below. At this time, bottom blowing 02 is preferable, but when the furnace body is sufficiently preheated, coke may be ignited only by top blowing 02. If the amount of crushed coke in the bedding is less than 50 kg/t, it is difficult to use it as a spark for melting scrap, and on the other hand, since coke is an expensive carbon material, it is uneconomical to use more than 200 kg/t of coke in the bedding. . Therefore, the charging amount of bedding coke was set to 50 kg/t to 200 kg/t.
(b)スクラップの溶解
次いで、スクラップを装入し、炭材を投入しなから02
を上底吹きすることにより溶存旦が2.0%以上のメタ
ルを得る。(b) Melting the scrap, then charging the scrap and adding carbon material.02
By top-bottom blowing, a metal with a dissolved mass of 2.0% or more is obtained.
炭材としてはコークスが扱い易いが石炭でもよい。溶解
完了時のメタル中の逅を2.0%以上とするのは、後工
程の脱硫処理が極力還元雲囲気とするのが好ましいから
であり、一方、溶鋼への加炭能率を考慮してCを2.0
%以上とした。Coke is easy to handle as the carbonaceous material, but coal may also be used. The reason why the carbon content in the metal at the time of completion of melting is set to 2.0% or more is because it is preferable that the post-process desulfurization treatment be surrounded by a reducing cloud as much as possible, and on the other hand, considering the efficiency of carburizing the molten steel. C 2.0
% or more.
(c)脱硫処理
スクラップの溶解後には主に炭材からのSを除去する必
要があり、このためには高塩基度のスラグを形成し、メ
タル−スラグを攪拌するのが好ましい。しかしながら、
本発明ではメタル中のCを2.0%以上としており、十
分な攪拌を行なえば、スラグ中のT−Feは3%以下に
できる。このような還元雰囲気において、スラグの塩基
度Ca O/Si O7は1.2以上程度でも十分な脱
硫が達成できることが確認された。(c) Desulfurization Treatment After melting the scrap, it is necessary to mainly remove S from the carbonaceous material, and for this purpose it is preferable to form a slag with a high basicity and stir the metal slag. however,
In the present invention, the C content in the metal is set to 2.0% or more, and if sufficient stirring is performed, the T-Fe content in the slag can be reduced to 3% or less. In such a reducing atmosphere, it was confirmed that sufficient desulfurization could be achieved even when the basicity of the slag, CaO/SiO7, was about 1.2 or more.
また、スラグ中のT−Feは低いほど鉄分損失が低くな
り耐火物損傷防止の点でも好ましい。Further, the lower the T-Fe content in the slag, the lower the iron content loss, which is preferable from the viewpoint of preventing damage to refractories.
(d)脱炭、脱窒処理
本発明の方法では、脱硫終了後、スラグおよび残留炭材
を除去してスラグレスの状態で02を吹込み、脱炭、脱
窒を行うこととした。メタル中のCが高いほど脱窒に望
ましいが、加炭材(コークス等)の使用による加炭効率
を考慮して2.0%以上で脱炭、脱窒を行うこととした
。さらに、一般に熱源が過剰になるため、冷材としてス
クラップを追加装入するが、高マンガン鋼ではマンガン
鉱石を使うこともできる。(d) Decarburization and denitrification treatment In the method of the present invention, after desulfurization is completed, slag and residual carbonaceous materials are removed, and 02 is blown in a slag-free state to perform decarburization and denitrification. The higher the C content in the metal, the more desirable it is for denitrification, but in consideration of the carburization efficiency due to the use of a carburizing agent (such as coke), decarburization and denitrification were performed at 2.0% or more. Furthermore, as the heat source becomes excessive, scrap is generally added as a cooling material, but manganese ore can also be used for high manganese steel.
以下、本発明を実施例により説明するが、これらの実施
例は本発明の単なる例示であり、本発明の技術的範囲を
何等制限するものではないことは勿論である。Hereinafter, the present invention will be explained with reference to examples, but these examples are merely illustrative of the present invention, and it goes without saying that they do not limit the technical scope of the present invention in any way.
実施例1
炉底羽口を備えた70を転炉を用いて本発明を実施した
。Example 1 The present invention was carried out using a converter 70 equipped with bottom tuyeres.
6t(スクラップに対して80kg/t )のコークス
を投入して床敷とし、炉保有熱と底吹02で着火させた
。底吹02量は40ONm3/hrでスクラップ装入終
了時まで0□の底吹を継続した。6 tons (80 kg/t 2 of scrap) of coke was put into the coke and used as a bedding, and ignited using the heat retained in the furnace and the bottom blower 02. The amount of bottom blowing 02 was 40ONm3/hr, and the bottom blowing of 0□ was continued until the end of scrap charging.
スクラップは2Otづつ3回と10tを1回の4回に分
けて装入し、各回のスクラップ装入間には、転炉を垂直
にして、上吹ランスおよび底吹羽口から02を吹き込ん
だ。Scrap was charged in four parts: three times of 20 tons and one time of 10 tons. Between each scrap charge, the converter was held vertically and 02 was blown from the top blowing lance and the bottom blowing tuyere. .
スクラップ装入後、上吹02 : 1300ONm
3/hr。After charging scrap, top blowing 02: 1300ONm
3/hr.
底吹02 :10100N/hr 、底吹N 2
: 30ONm’/hr吹込流量で複合送酸し、一方、
13t(スクラップに対して170kg/t)の炭材を
複合送酸の後半期に40分にわたり約300kg/mi
nで均−公役した。さらに、次の工程の転炉内脱硫のた
めに生石灰を3t(スクラップに対して40kg/t)
投入した。Bottom blowing 02: 10100N/hr, bottom blowing N2
: Combined oxygen supply at a blowing flow rate of 30ONm'/hr, while
13 tons (170 kg/t for scrap) of carbonaceous materials are pumped at approximately 300 kg/mi for 40 minutes during the latter half of the composite oxygen supply.
He served as a uniform official at n. In addition, 3 tons of quicklime (40 kg/t for scrap) was added for desulfurization in the converter in the next process.
I put it in.
脱硫工程は底吹N 2 : 40ONm3/hrで行
った。このときのスラグ組成は次の通りである。The desulfurization process was performed with bottom-blown N 2 :40ONm3/hr. The slag composition at this time is as follows.
CaO:5102 :A1203=50 :25 :1
2底吹N2により、メタル−スラグ攪拌を行い、脱硫と
ともに、残留炭材によるスラグ遺児およびメタル中の〔
03%の上昇を達成した。CaO:5102:A1203=50:25:1
Metal-slag agitation is carried out using double-bottom N2 blowing, and in addition to desulfurization, slag remains due to residual carbonaceous material and [
Achieved an increase of 0.3%.
Sを0.015%まで低減した後、スラグおよび残留炭
材を除去し、熱源が余るため、スクラップを10を追加
したのち成分調整のため、生石灰700kgを投入して
上吹02: 1300ONm’/hr、底吹Ar: 2
0ONm3/hrの複合吹錬で、10分間スラグレス脱
炭を行った。After S was reduced to 0.015%, slag and residual carbonaceous material were removed, and 10 scraps were added because there was a surplus of heat source, and then 700 kg of quicklime was added to adjust the composition and top blowing was carried out at 02: 1300 ONm'/ hr, bottom blowing Ar: 2
Slagless decarburization was performed for 10 minutes by combined blowing at 0ONm3/hr.
メタルおよびスラグの成分および、′二゛ル温度は次の
第1表に示す通りである。The components of the metal and slag and their temperature are shown in Table 1 below.
なお、出鋼までのコークス原単位は250kg/t 。Furthermore, the coke consumption rate up to tapping is 250 kg/t.
02原単位は20ONm3/hrであった。02 basic unit was 20ONm3/hr.
実施例2
炉底羽口を備えた70を転炉を用いてNi −Cr系ス
テンレススクラップを溶解し、5IIS 304を溶製
した。Example 2 5IIS 304 was produced by melting Ni-Cr stainless steel scrap using a converter in a steel 70 equipped with a hearth bottom tuyere.
8t(スクラップに対して105kg/t )のコーク
スを投入して床敷とし、炉保有熱と底吹02で着火させ
た。底吹02量は40ONm3/hrでスクラップ装入
終了時まで継続した。8 tons of coke (105 kg/t 2 based on scrap) was charged as a bedding, and ignited using the heat retained in the furnace and the bottom blower 02. The amount of bottom blowing 02 continued at 40 ONm3/hr until the end of scrap charging.
スクラップは2Otづつ3回と10tを1回の4回に分
けて装入し、各回のスクラップ装入間には、転炉を垂直
にして、上吹ランスおよび底吹羽口から02を吹き込ん
だ。Scrap was charged in four parts: three times of 20 tons and one time of 10 tons. Between each scrap charge, the converter was held vertically and 02 was blown from the top blowing lance and the bottom blowing tuyere. .
スクラップ装入後、上吹02: 1300ONm3/h
r、底吹02: 10100N/hr、底吹N 2 :
30ONm3/hrで複合送酸し、一方、18t (
スクラップに対して240kg/t)の炭材をスクラッ
プ溶解用の複合送酸の後半期に60分にわたり約300
kg/minで均−公役した。さらに、次の工程の転炉
内脱硫のために生石灰を2t(スクラップに対して26
kg/t)投入した。After charging scrap, top blowing 02: 1300ONm3/h
r, bottom blowing 02: 10100N/hr, bottom blowing N2:
Combined oxygen supply was carried out at 30ONm3/hr, while 18t (
Approximately 300 kg/t of carbonaceous material (240 kg/t for scrap) was added over 60 minutes during the latter half of the composite oxygen supply for scrap melting.
kg/min. Furthermore, 2 tons of quicklime (26 tons for scrap) was added for desulfurization in the converter in the next step.
kg/t).
脱硫工程は底吹N 2 : 40ONm3/hrで行
った。このときのスラグ組成は次の通りである。The desulfurization process was performed with bottom-blown N 2 :40ONm3/hr. The slag composition at this time is as follows.
Ca O: 5102 :八1203−32 :25
:21底吹N2により、メタル−スラグ攪拌を行い、脱
硫とともに、残留炭材によるスラグ還元およびメタル中
の〔03%の上昇を達成した。CaO: 5102:81203-32:25
:21 Metal-slag agitation was performed by bottom-blowing N2, and in addition to desulfurization, slag reduction by residual carbonaceous material and an increase of [03% in metal] were achieved.
Sを0.015%まで低減した後、゛スラグおよび残留
炭材を除去し、温度調整用にSUS 304系のスクラ
ップを10を追加して脱炭を開始した。脱炭期の吹込は
次の如く行った。After reducing S to 0.015%, slag and residual carbonaceous materials were removed, and 10 pieces of SUS 304-based scrap were added for temperature adjustment, and decarburization was started. Injection during the decarbonization period was performed as follows.
最初の12分間:
上吹02:1300ONm3/hr、底吹Ar +20
ONm’/hr次の10分間:
上吹02: 400ONm’/hr、底吹Ar:40O
Nm3/hr最後の30分間:
上吹02: 10100ON/hr、底吹Ar+40O
Nm3/hr更に、脱炭の間にスラグ調整用に生石炭1
000kgを添加した。First 12 minutes: Top blow 02: 1300ONm3/hr, bottom blow Ar +20
ONm'/hr Next 10 minutes: Top blowing 02: 400ONm'/hr, bottom blowing Ar: 40O
Nm3/hr last 30 minutes: Top blow 02: 10100ON/hr, bottom blow Ar+40O
Nm3/hr Furthermore, raw coal 1 is used for slag adjustment during decarburization.
000 kg was added.
メタルおよびスラグの成分、メタルの温度は第2表に示
す通りである。The components of the metal and slag and the temperature of the metal are as shown in Table 2.
このあと、FeSi、AI等の合金を用いてスラグのa
元1i: 行すい、低炭素フェロクロムやフェロマン
ガンを添加して成分調整後、出鋼した。After this, the slag a is made using alloys such as FeSi and AI.
Original 1i: After adjusting the composition by adding low carbon ferrochrome and ferromanganese, steel was tapped.
効果
以上説明の如く、本発明は既存の複合吹錬用転炉を用い
てスクラップから高級鋼およびステンレス鋼を溶解精錬
することに成功したものであり、土中のスクラップを大
量に使用可能であることのほか、製鉄所内で発生するス
クラップも有効利用することができる。また、わが国に
おける今後の車中スクラップの増加傾向に鑑みても本発
明の産業上の価値は大である。Effects As explained above, the present invention has succeeded in melting and refining high-grade steel and stainless steel from scrap using an existing composite blowing converter, and it is possible to use a large amount of scrap found in the earth. In addition, scrap generated within the steelworks can also be used effectively. Furthermore, the present invention has great industrial value in view of the increasing tendency of car scrap in the future in Japan.
Claims (3)
備える反応容器によってスクラップを溶解精錬する方法
であって、 (a)スクラップ装入に先立ち、50kg/t〜200
kg/tのコークスを反応容器内に投入し、上記の底吹
羽口および/または上吹ランスよりO_2を吹込み、コ
ークスを着火させてスクラップ溶解の火種とすること、 (b)次いで、スクラップを装入し、炭材を投入しなが
ら上記の底吹羽口および上吹ランスからO_2を吹き込
んで、溶解完了時にメタルが2.0%以上の¥C¥を含
有するようにスクラップを溶解すること、 (c)スクラップ溶解を完了した後、スラグの塩基度C
aO/SiO_2が1.2以上となるようにスラグ成分
を調整して脱硫するとともに、底吹羽口より非酸化性ガ
スを吹込みスラグおよびメタルを攪拌してスラグ中の(
T−Fe)を3%未満とすること、 (d)上記工程(c)の脱硫を完了した後、スラグおよ
び残留炭材を除去して、得られたCが2.0%以上のメ
タルを上底吹送酸することによって脱炭、脱窒素を行う
こと、 を特徴とするスクラップの溶解精錬方法。(1) A method of melting and refining scrap using a reaction vessel equipped with a gas blowing tuyere at the bottom of the furnace and a lance above the furnace, comprising:
kg/t of coke is charged into the reaction vessel, and O_2 is blown into the bottom blowing tuyere and/or the top blowing lance to ignite the coke and use it as a spark for melting the scrap; (b) Next, scrap and melt the scrap so that the metal contains 2.0% or more ¥C¥ by the time melting is completed by blowing O_2 from the bottom blowing tuyere and top blowing lance while charging the carbonaceous material. (c) After completing the scrap melting, the basicity C of the slag
Desulfurization is performed by adjusting the slag components so that aO/SiO_2 is 1.2 or more, and non-oxidizing gas is blown from the bottom blowing tuyere to stir the slag and metal.
(d) After completing the desulfurization in step (c) above, remove the slag and residual carbonaceous material to obtain a metal with a carbon content of 2.0% or more. A scrap melting and refining method characterized by performing decarburization and denitrification by top-bottom blowing acid.
る特許請求の請求の範囲第1項記載のスクラップの溶解
精錬方法。(2) The method for melting and refining scrap as set forth in claim 1, wherein the scrap is ordinary steel scrap.
徴とする特許請求の請求の範囲第1項記載のスクラップ
の溶解精錬方法。(3) The method for melting and refining scrap as set forth in claim 1, wherein the scrap is stainless steel scrap.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60185192A JPS6247417A (en) | 1985-08-23 | 1985-08-23 | Melt refining method for scrap |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60185192A JPS6247417A (en) | 1985-08-23 | 1985-08-23 | Melt refining method for scrap |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6247417A true JPS6247417A (en) | 1987-03-02 |
JPH0435529B2 JPH0435529B2 (en) | 1992-06-11 |
Family
ID=16166467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60185192A Granted JPS6247417A (en) | 1985-08-23 | 1985-08-23 | Melt refining method for scrap |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6247417A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01191725A (en) * | 1988-01-28 | 1989-08-01 | Nippon Steel Corp | Method for producing low-sulfur high-carbon molten iron from ferruginous cold charge |
CN103555879A (en) * | 2013-10-21 | 2014-02-05 | 莱芜钢铁集团有限公司 | Control method for reducing total iron content of SPHC (steel plate heat commercial) final slag |
JP2021046591A (en) * | 2019-09-19 | 2021-03-25 | 日本製鉄株式会社 | Method for melting iron-containing material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103614616B (en) * | 2013-11-12 | 2015-04-22 | 唐山曹妃甸区通鑫再生资源回收利用有限公司 | Steel-making cooling cold material-remelted steel and preparation method thereof |
-
1985
- 1985-08-23 JP JP60185192A patent/JPS6247417A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01191725A (en) * | 1988-01-28 | 1989-08-01 | Nippon Steel Corp | Method for producing low-sulfur high-carbon molten iron from ferruginous cold charge |
JPH0480085B2 (en) * | 1988-01-28 | 1992-12-17 | Nippon Steel Corp | |
CN103555879A (en) * | 2013-10-21 | 2014-02-05 | 莱芜钢铁集团有限公司 | Control method for reducing total iron content of SPHC (steel plate heat commercial) final slag |
JP2021046591A (en) * | 2019-09-19 | 2021-03-25 | 日本製鉄株式会社 | Method for melting iron-containing material |
Also Published As
Publication number | Publication date |
---|---|
JPH0435529B2 (en) | 1992-06-11 |
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