JP2010222660A - Method for refining molten steel - Google Patents

Method for refining molten steel Download PDF

Info

Publication number
JP2010222660A
JP2010222660A JP2009072490A JP2009072490A JP2010222660A JP 2010222660 A JP2010222660 A JP 2010222660A JP 2009072490 A JP2009072490 A JP 2009072490A JP 2009072490 A JP2009072490 A JP 2009072490A JP 2010222660 A JP2010222660 A JP 2010222660A
Authority
JP
Japan
Prior art keywords
converter
iron
charged
scrap
molten 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.)
Pending
Application number
JP2009072490A
Other languages
Japanese (ja)
Inventor
Kenji Ando
健治 安藤
Kyoichi Kameyama
恭一 亀山
Tomoo Izawa
智生 井澤
Ikuhiro Sumi
郁宏 鷲見
Hiroshi Nomura
寛 野村
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.)
JFE Steel Corp
Original Assignee
JFE 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 JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2009072490A priority Critical patent/JP2010222660A/en
Publication of JP2010222660A publication Critical patent/JP2010222660A/en
Pending legal-status Critical Current

Links

Images

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

  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for refining molten steel with which in the case of charging the molten iron, it can be restrained that combustibles in iron-scrap are ignited and flame or black smoke caused by the ignition of the combustibles, is spouted from the furnace opening hole of a converter without needing much facility cost. <P>SOLUTION: When the molten iron 10 is charged into the converter 1 after charging the iron-scrap 8 containing the combustibles into the converter 1, the converter 1 is returned back to the erected state after charging the iron-scrap 8 into the converter 1, and the molten iron 10 is charged into the converter 1 after igniting the combustibles in the iron-scrap 8 by blowing oxygen-gas 9 into the converter 1 in the returned state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、溶鋼の精錬方法に関し、特に、転炉内で精錬される溶鋼の冷鉄源として可燃物を含む鉄スクラップを用いて溶鋼を精錬する方法に関する。   The present invention relates to a method for refining molten steel, and more particularly, to a method for refining molten steel using iron scrap containing combustible materials as a cold iron source for molten steel refined in a converter.

一般に、転炉内で溶鋼を精錬するときには溶鋼の鉄源として溶銑が転炉内に装入されるが、転炉への溶銑量の装入量が少ない場合には、溶銑の不足分を補うために、使用済み自動車や廃ベルト材等の鉄スクラップが溶鋼の冷鉄源として転炉内に装入される（例えば、特許文献１参照）。この場合、樹脂やオイルなどの可燃物が鉄スクラップに含まれていると、鉄スクラップを転炉内に装入した後、溶銑を転炉内に装入すると鉄スクラップに含まれる可燃物が発火し、可燃物の発火によって転炉の炉口から火炎や黒煙が噴出するという問題が生じる。
そこで、かかる問題を解決するため、溶銑が入った転炉内に鉄スクラップを装入する際に、転炉の炉口上方部から炉口に向けて冷却水をミスト状に散布しながら転炉内に鉄スクラップを装入する方法が提案されている（特許文献２参照）。 Generally, when refining molten steel in the converter, hot metal is charged into the converter as an iron source for the molten steel. However, if the amount of molten iron in the converter is small, the shortage of molten iron is compensated. Therefore, iron scraps such as used automobiles and waste belt materials are charged into the converter as a cold iron source of molten steel (see, for example, Patent Document 1). In this case, if combustible materials such as resin and oil are contained in the iron scrap, the combustible material contained in the iron scrap is ignited when the hot metal is charged into the converter after the iron scrap is charged in the converter. However, there is a problem that flames and black smoke are ejected from the furnace port of the converter due to the ignition of the combustible material.
Therefore, in order to solve such problems, when iron scrap is charged into the converter containing hot metal, the converter is sprayed in a mist from the upper part of the converter opening toward the furnace opening. A method of charging iron scrap inside is proposed (see Patent Document 2).

特開２００１−５９１１０号公報JP 2001-59110 A 特開２００５−８９７９２号公報Japanese Patent Laid-Open No. 2005-87992

上述した方法によると、溶銑が入った転炉内に鉄スクラップを装入したときに鉄スクラップに含まれる可燃物が発火して転炉の炉口から火炎や黒煙が噴出することを抑制することが可能である。しかしながら、転炉の炉口上方部から炉口に向けて冷却水をミスト状に散布するための散水設備を新設する必要があるため、多大の設備費を要するという問題があった。また、転炉の炉口上方部から炉口に向けて散水された冷却水が転炉内に入り込むと、溶銑を転炉内に装入したときに水蒸気爆発が生じたり、転炉に内張りされた耐火煉瓦が破損したりする可能性もあった。
本発明は上述した問題点に鑑みてなされたもので、溶銑の装入時に鉄スクラップの可燃物が発火し、可燃物の発火により火炎や黒煙が転炉の炉口から噴出することを多大の設備費を要することなく抑制することのできる溶鋼の精錬方法を提供することを目的とするものである。 According to the above-described method, when iron scrap is charged into a converter containing molten iron, combustibles contained in the iron scrap are ignited and flame and black smoke are prevented from being ejected from the furnace port of the converter. It is possible. However, since it is necessary to newly install watering equipment for spraying the cooling water in a mist form from the upper part of the converter opening to the furnace opening, there is a problem that a great equipment cost is required. In addition, if the cooling water sprayed from the upper part of the converter entrance to the furnace entrance enters the converter, a steam explosion may occur when the hot metal is charged into the converter, or it may be lined in the converter. There was also a possibility that the firebrick was damaged.
The present invention has been made in view of the above-mentioned problems, and it is a great deal of fire that combustible materials of iron scrap are ignited when hot metal is charged, and that flames and black smoke are ejected from the furnace port of the converter due to the ignition of combustible materials. An object of the present invention is to provide a method for refining molten steel that can be suppressed without requiring any equipment cost.

上記課題を解決するため、本発明に係る溶鋼の精錬方法は、転炉内で精錬される溶鋼の冷鉄源として可燃物を含む鉄スクラップを前記転炉内に装入した後、前記転炉内に溶銑を装入して溶鋼を精錬する溶鋼の精錬方法であって、前記鉄スクラップを前記転炉内に装入した後に前記転炉を直立した状態に戻し、この状態で前記転炉内に酸素ガスを吹き込んで前記可燃物を燃焼せしめた後、前記転炉内に溶銑を装入することを特徴とするものである。
本発明に係る溶鋼の精錬方法において、前記転炉内に装入される鉄スクラップの装入量は溶銑と鉄スクラップの合計装入量の３％〜１０％であることが好ましい。 To solve the above problems, refining method of molten steel according to the present invention, after the iron scrap containing combustible materials were charged to the converter in a cold iron source of the molten steel being refined in a converter furnace, the converter A molten steel refining method for refining molten steel by charging molten iron in the furnace, wherein after the iron scrap is charged into the converter, the converter is returned to an upright state, and in this state the inside of the converter After the oxygen gas is blown into the flammable material to burn the combustible material, the hot metal is charged into the converter.
In the molten steel refining method according to the present invention, the amount of iron scrap charged into the converter is preferably 3% to 10% of the total amount of molten iron and iron scrap.

本発明に係る溶鋼の精錬方法によると、溶銑の装入時に鉄スクラップの可燃物が発火し、可燃物の発火により火炎や黒煙が転炉の炉口から噴出することを多大の設備費を要することなく抑制することができる。   According to the method for refining molten steel according to the present invention, the combustible material of iron scrap is ignited at the time of molten metal charging, and the flame and black smoke are ejected from the furnace port of the converter due to the ignition of the combustible material. It can suppress without requiring.

本発明に係る溶鋼の精錬方法に用いられる転炉設備の一例を示す図である。It is a figure which shows an example of the converter equipment used for the refining method of the molten steel which concerns on this invention. 本発明に係る溶鋼の精錬方法の一実施形態を示す図である。It is a figure which shows one Embodiment of the refining method of the molten steel which concerns on this invention.

以下、図面を参照して本発明に係る溶鋼の精錬方法について説明する。
本発明に係る溶鋼の精錬方法に用いられる転炉設備の一例を図１に示す。図１に示される転炉設備は図示しないトラニオン軸を中心に図中左右方向に傾動可能な転炉１を備えており、この転炉１の上部には、転炉１内に酸素ガスを吹き込む上吹きランス２が昇降可能に設けられているとともに、転炉１から排出される排ガスを回収するための排ガスフード３が設けられている。また、図１に示される転炉設備は溶銑鍋４やスクラップシュート５を載置するための架台６を備えており、この架台６の上方には、溶銑鍋４に入った溶銑やスクラップシュート５に積み込まれた鉄スクラップを転炉１内に装入するためのクレーン７が設けられている。
図１に示される転炉設備の転炉１に可燃物を含む鉄スクラップと溶銑を装入して溶鋼を精錬する場合は、まず、直立状態の転炉１を斜めに傾けた後、スクラップシュート５から転炉１内に鉄スクラップ８を溶銑と鉄スクラップの合計装入量の３％〜１０％の範囲内で装入する（図２（ａ）参照）。 Hereinafter, a method for refining molten steel according to the present invention will be described with reference to the drawings.
An example of converter equipment used in the method for refining molten steel according to the present invention is shown in FIG. The converter equipment shown in FIG. 1 includes a converter 1 that can tilt in the left-right direction in the figure around a trunnion shaft (not shown), and oxygen gas is blown into the converter 1 above the converter 1. An upper blowing lance 2 is provided so as to be movable up and down, and an exhaust gas hood 3 for collecting exhaust gas discharged from the converter 1 is provided. 1 includes a gantry 6 on which the hot metal ladle 4 and the scrap chute 5 are placed. Above the gantry 6, the hot metal and scrap chute 5 contained in the hot ladle 4 are provided. A crane 7 is provided for charging the iron scrap loaded into the converter 1 into the converter 1.
In the case of refining molten steel by charging iron scrap and hot metal containing combustible material into the converter 1 of the converter facility shown in FIG. 5, iron scrap 8 is charged into converter 1 within a range of 3% to 10% of the total amount of molten iron and iron scrap (see FIG. 2A).

次に、転炉１の炉口が真上を向くように転炉１を直立した状態に戻した後、上吹きランス２から転炉１内に酸素ガス９を吹き込む（図２（ｂ）参照）。このとき、転炉１内に装入された鉄スクラップ８の可燃物は転炉１内に吹き込まれた酸素ガス９と共に燃焼する。また、可燃物の燃焼によって発生した黒煙やダストは排ガスフード３に流入し、この排ガスフード３内を通って不図示の集塵機に回収される。
このようにして上吹きランス２から転炉１内に吹き込まれた酸素ガス９により鉄スクラップ８の可燃物が燃え尽きたならば、転炉１を再び斜めに傾けた後、溶銑鍋４から転炉１内に溶銑１０を装入する（図２（ｃ）参照）。このとき、転炉１内の鉄スクラップ８は転炉１内に装入された溶銑１０により溶融し、溶銑１０と共に溶鋼となる。 Next, after the converter 1 is returned to an upright state so that the furnace port of the converter 1 faces directly above, oxygen gas 9 is blown into the converter 1 from the top blowing lance 2 (see FIG. 2B). ). At this time, the combustible material of the iron scrap 8 charged in the converter 1 burns together with the oxygen gas 9 blown into the converter 1. Further, black smoke and dust generated by the combustion of combustible material flow into the exhaust gas hood 3 and pass through the exhaust gas hood 3 and are collected by a dust collector (not shown).
If the combustible material of the iron scrap 8 is burned out by the oxygen gas 9 blown into the converter 1 from the top blowing lance 2 in this way, the converter 1 is inclined again and then the converter from the hot metal ladle 4 1 is charged with hot metal 10 (see FIG. 2C). At this time, the iron scrap 8 in the converter 1 is melted by the hot metal 10 charged in the converter 1 and becomes molten steel together with the hot metal 10.

上述のように、可燃物を含む鉄スクラップ８を転炉１内に装入した後、転炉１内に溶銑１０を装入して溶鋼を精錬する際に、鉄スクラップ８を転炉１内に装入した後に転炉１を直立した状態に戻し、この状態で転炉１内に酸素ガス９を上吹きランス２から吹き込んで鉄スクラップ８の可燃物を燃焼せしめた後、転炉１内に溶銑１０を装入すると、溶銑１０の装入時に鉄スクラップ８の可燃物が発火し、可燃物の発火により転炉１の炉口から火炎や黒煙が噴出することが抑制される。また、特許文献２に開示されたもののように、転炉の炉口上部から炉口に向けて冷却水をミスト状に散布する散水設備を転炉の炉口上部に新設する必要もない。   As described above, the iron scrap 8 containing combustible material is charged into the converter 1, and then the molten steel 10 is charged into the converter 1 to refine the molten steel. After the converter 1 is charged, the converter 1 is returned to an upright state, and in this state, the oxygen gas 9 is blown into the converter 1 from the top blowing lance 2 to burn the combustibles of the iron scrap 8, and then the converter 1 When the hot metal 10 is charged into the hot metal 10, the combustible material of the iron scrap 8 is ignited when the hot metal 10 is charged, and flame and black smoke are prevented from being ejected from the furnace port of the converter 1 due to the ignition of the combustible material. Further, unlike the one disclosed in Patent Document 2, it is not necessary to newly install a watering facility for spraying cooling water in a mist form from the upper part of the converter to the furnace opening.

したがって、溶銑１０の装入時に鉄スクラップ８の可燃物が発火し、可燃物の発火により火炎や黒煙が転炉１の炉口から噴出することを多大の設備費を要することなく抑制することができる。
転炉内に装入される鉄スクラップとして（社）日本鉄源協会で等級化されたＨ２屑を用い、溶銑と鉄スクラップの合計装入量に対するＨ２屑の割合を０％、３％、５％、１０％とした場合における転炉内で発生する火炎と黒煙の発生状況を調査した結果を表１に示す。 Therefore, the combustible material of the iron scrap 8 is ignited when the hot metal 10 is charged, and flames and black smoke are prevented from being ejected from the furnace port of the converter 1 by igniting the combustible material without requiring a large facility cost. Can do.
Using H2 scrap graded by the Japan Iron Source Association as iron scrap charged into the converter, the ratio of H2 scrap to the total charge of hot metal and iron scrap is 0%, 3%, 5 Table 1 shows the results of investigating the occurrence of flame and black smoke generated in the converter when the ratio is 10% and 10%.

Figure 2010222660
Figure 2010222660

表１において、「軽微」、「中程度」、「大」は転炉内での火炎と黒煙の発生程度を表わしている。
表１に示されるように、鉄スクラップが装入された転炉内に酸素ガスを吹き込んで鉄スクラップの可燃物を事前に燃焼させなかった場合はＨ２屑の割合が増えるに従って火炎や黒煙の発生度が多くなるのに対し、鉄スクラップが装入された転炉内に酸素ガスを吹き込んで鉄スクラップの可燃物を事前に燃焼させた場合はＨ２屑の割合が３％〜１０％でも火炎や黒煙の発生度が低いことがわかる。
したがって、溶銑の装入時に鉄スクラップの可燃物が発火し、可燃物の発火により火炎や黒煙が転炉の炉口から噴出することを多大の設備費を要することなく抑制することができる。 In Table 1, “Minor”, “Medium” and “Large” represent the degree of generation of flame and black smoke in the converter.
As shown in Table 1, when oxygen gas was blown into the converter into which iron scrap was charged and the combustibles of iron scrap were not burned in advance, flame and black smoke increased as the proportion of H2 scrap increased. When the rate of occurrence increases, when oxygen gas is blown into the converter into which iron scrap is charged and the combustibles of iron scrap are burned in advance, even if the proportion of H2 scrap is 3% to 10%, flame It can be seen that the incidence of black smoke is low.
Therefore, it is possible to suppress the combustible material of iron scrap from being ignited when the hot metal is charged, and to prevent the flame and black smoke from being ejected from the furnace port of the converter due to the ignition of the combustible material without requiring a large facility cost.

また、溶銑を装入するに先立って転炉に吹き込まれる酸素ガスの吹き込み量をＨ２屑１トン当り２０〜７０Ｎｍ３にすると、火炎や黒煙の発生を「軽微」に抑えられることが表１に示す実験結果からわかる。したがって、溶銑を装入するに先立って転炉に吹き込まれる酸素ガスの吹き込み量は２０〜７０Ｎｍ３／Ｈ２−ｔであることが好ましい。
上述した本発明の一実施形態では、鉄スクラップ８が装入された転炉１内に酸素ガス９を上吹きランス２から吹き込んで鉄スクラップ８の可燃物を燃焼させるようにしたが、転炉が底吹き転炉の場合には転炉の底部から酸素ガス９を吹き込んで鉄スクラップ８の可燃物を燃焼させてもよい。
また、転炉の底部に形成された羽口から酸素ガスを転炉内に吹き込んでもよいし、上吹きランスと羽口の両方から酸素ガスを転炉内に吹き込んでもよい。 Also, when the blowing amount of oxygen gas blown into the converter prior to charging the molten iron to H2 scrap per ton of 20 to 70 nm 3, the table can be suppressed the occurrence of fire and smoke in the "minor" 1 It can be seen from the experimental results shown in. Therefore, it is preferable that the amount of oxygen gas blown into the converter prior to charging the hot metal is 20 to 70 Nm 3 / H 2 -t.
In the above-described embodiment of the present invention, the oxygen gas 9 is blown from the top blowing lance 2 into the converter 1 in which the iron scrap 8 is charged, and the combustible material of the iron scrap 8 is burned. In the case of a bottom blown converter, oxygen gas 9 may be blown from the bottom of the converter to burn the combustible material of the iron scrap 8.
Further, oxygen gas may be blown into the converter from the tuyere formed at the bottom of the converter, or oxygen gas may be blown into the converter from both the upper blowing lance and tuyere.

１…転炉、２…上吹きランス、３…排ガスフード、４…溶銑鍋、５…スクラップシュート、６…架台、７…クレーン、８…鉄スクラップ、９…酸素ガス、１０…溶銑。   DESCRIPTION OF SYMBOLS 1 ... Converter, 2 ... Top blowing lance, 3 ... Exhaust gas hood, 4 ... Hot metal ladle, 5 ... Scrap chute, 6 ... Mount, 7 ... Crane, 8 ... Iron scrap, 9 ... Oxygen gas, 10 ... Hot metal.

Claims (2)

転炉内で精錬される溶鋼の冷鉄源として可燃物を含む鉄スクラップを前記転炉内に装入した後、前記転炉内に溶銑を装入して溶鋼を精錬する溶鋼の精錬方法であって、
前記鉄スクラップを前記転炉内に装入した後に前記転炉を直立した状態に戻し、この状態で前記転炉内に酸素ガスを吹き込んで前記可燃物を燃焼せしめた後、前記転炉内に溶銑を装入することを特徴とする溶鋼の精錬方法。 In a method for refining molten steel, iron scrap containing combustible materials as a cold iron source for molten steel refined in a converter is charged into the converter, and then molten iron is charged into the converter to refine the molten steel. There,
After charging the iron scrap into the converter, the converter is returned to an upright state. In this state, oxygen gas is blown into the converter to burn the combustible material, and then the converter is put into the converter. A method for refining molten steel, characterized by charging molten iron. 前記転炉内に装入される鉄スクラップの装入量が溶銑と鉄スクラップの合計装入量の３％〜１０％であることを特徴とする請求項１記載の溶鋼の精錬方法。   The method for refining molten steel according to claim 1, wherein the amount of iron scrap charged into the converter is 3% to 10% of the total amount of molten iron and iron scrap.
JP2009072490A 2009-03-24 2009-03-24 Method for refining molten steel Pending JP2010222660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009072490A JP2010222660A (en) 2009-03-24 2009-03-24 Method for refining molten steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009072490A JP2010222660A (en) 2009-03-24 2009-03-24 Method for refining molten steel

Publications (1)

Publication Number Publication Date
JP2010222660A true JP2010222660A (en) 2010-10-07

Family

ID=43040163

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009072490A Pending JP2010222660A (en) 2009-03-24 2009-03-24 Method for refining molten steel

Country Status (1)

Country Link
JP (1) JP2010222660A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111549196A (en) * 2019-02-10 2020-08-18 新疆八一钢铁股份有限公司 Steelmaking operation method for replacing coolant with scrap steel broken material

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312921B2 (en) * 1985-08-20 1988-03-23 Urarusukii Nauchino Isusuredo* Inst Choorunuifu Metarofu
JPH03291331A (en) * 1990-04-09 1991-12-20 Blufin Srl Scrap iron preheating method by recovering all of energy of resinous residue contained in scrap iron and by thermally decomposing said resinous residue while improving steel producing cycle
JPH10330821A (en) * 1997-06-03 1998-12-15 Sumitomo Metal Ind Ltd Operation of steelmaking melting furnace
JP2003034826A (en) * 2001-07-25 2003-02-07 Nkk Corp Iron source raw material for iron manufacture
JP2003306712A (en) * 2002-04-19 2003-10-31 Nippon Steel Corp Method for preheating scrap charged in converter
JP2004232024A (en) * 2003-01-30 2004-08-19 Sumitomo Metal Ind Ltd Steelmaking method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312921B2 (en) * 1985-08-20 1988-03-23 Urarusukii Nauchino Isusuredo* Inst Choorunuifu Metarofu
JPH03291331A (en) * 1990-04-09 1991-12-20 Blufin Srl Scrap iron preheating method by recovering all of energy of resinous residue contained in scrap iron and by thermally decomposing said resinous residue while improving steel producing cycle
JPH10330821A (en) * 1997-06-03 1998-12-15 Sumitomo Metal Ind Ltd Operation of steelmaking melting furnace
JP2003034826A (en) * 2001-07-25 2003-02-07 Nkk Corp Iron source raw material for iron manufacture
JP2003306712A (en) * 2002-04-19 2003-10-31 Nippon Steel Corp Method for preheating scrap charged in converter
JP2004232024A (en) * 2003-01-30 2004-08-19 Sumitomo Metal Ind Ltd Steelmaking method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111549196A (en) * 2019-02-10 2020-08-18 新疆八一钢铁股份有限公司 Steelmaking operation method for replacing coolant with scrap steel broken material

Similar Documents

Publication Publication Date Title
US8114185B2 (en) Method of melting a mixture of scrap metal using scrap rubber
CN102925621A (en) Method for preventing dry dedusting system of semi-steel steel converter from explosion venting
KR102043907B1 (en) Starting a smelting process
CA2858176C (en) Starting a smelting process
JP2010222660A (en) Method for refining molten steel
JP3650193B2 (en) Method for melting metal raw materials
JP3096623B2 (en) Melting furnace
JP4165112B2 (en) Powder melting equipment
JPH10311688A (en) Method for melting metal
JPH04178A (en) Exhaust gas discharge system for cokeless cupola
JP2002003925A (en) Method for operating metal melting furnace
JP2003322313A (en) Oxygen burner for arc furnace
KR20200136925A (en) Direct smelting process through complete combustion
NZ626931B2 (en) Starting a smelting process
EP2587145A1 (en) Method for the pollution-free thermal processing of solid municipal waste and plant for carrying out said method
NZ626934B2 (en) Starting a smelting process
JPH1038233A (en) Waste thermal decomposition melting furnace
JPS57171638A (en) Treatment of dust from metal melting furnace
JPH02157590A (en) Cupola type scrap heating-melting furnace and scrap melting method
JP2002090065A (en) Cupola

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20120223

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20140422