JPH09165613A - Scrap melting method - Google Patents

Scrap melting method

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Publication number
JPH09165613A
JPH09165613A JP32448695A JP32448695A JPH09165613A JP H09165613 A JPH09165613 A JP H09165613A JP 32448695 A JP32448695 A JP 32448695A JP 32448695 A JP32448695 A JP 32448695A JP H09165613 A JPH09165613 A JP H09165613A
Authority
JP
Japan
Prior art keywords
molten slag
slag layer
carbonaceous material
molten
melting
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Withdrawn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
JP32448695A
Other languages
Japanese (ja)
Inventor
Shinya Kitamura
信也 北村
Yuji Ogawa
雄司 小川
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 JP32448695A priority Critical patent/JPH09165613A/en
Publication of JPH09165613A publication Critical patent/JPH09165613A/en
Withdrawn legal-status Critical Current

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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

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  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture Of Iron (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide the method for obtaining molten steel low in carbon content by suppressing the melting of carbon in a carbonaceous material into the molten steel at the time of melting an iron scrap by using combustion energy of the carbonaceous material as a main heat source. SOLUTION: At the time of executing the melting of the iron scrap by suspending the carbonaceous material into molten slag layer 3 in a melting furnace 1 and burning the carbonaceous material with top-blown or side-blown gaseous oxygen to generate the heat, the supplying rate of the carbonaceous material is adjusted so that the molten slag layer 3 contains carbon of 5-30wt.% to the slag. Further, tuyeres 4a, 4b are provided at the position corresponding to 0.35-0.65 times the thickness of the molten slag layer 3 from the lower surface of the molten slag layer, and gas is blown into the molten slag layer to stir selectively only the upper part of the molten slag layer. Further, electrodes 5 are arranged at the lower part of the molten slag layer and the molten steel having <=1% carbon concn. is obtd. by electrical heating.

Description

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

【０００１】[0001]

【発明の属する技術分野】本発明は、炭材の燃焼エネル
ギ−を主な熱源として鉄スクラップ（以下単にスクラッ
プという)を溶解するに際して、炭材中の炭素の溶鉄へ
の溶解を抑制し、炭素含有量の少ない溶鋼を得る方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention suppresses the dissolution of carbon in carbonaceous material into molten iron when melting scrap iron (hereinafter simply referred to as "scrap") using the combustion energy of carbonaceous material as a main heat source. The present invention relates to a method for obtaining molten steel having a low content.

【０００２】[0002]

【従来の技術】スクラップは通常電気炉で溶解される
が、多量の電力を必要とし電力コストが大きいため、エ
ネルギ−コストの小さい炭材の燃焼エネルギ−を如何に
有効に利用し、電気エネルギ−の使用比率を下げるかが
課題である。2. Description of the Related Art Scrap is usually melted in an electric furnace, but it requires a large amount of electric power and the electric power cost is large. The issue is to reduce the usage ratio of.

【０００３】近年、わが国においてもスクラップの発生
量が著しく増加し、鉄鋼生産のうちスクラップを原料と
するものの比率が増加してきており、より経済的で生産
性の高い溶解方法の開発が望まれている。In recent years, the amount of scraps generated has increased remarkably in Japan, and the ratio of those made from scraps in steel production has been increasing, and it is desired to develop a more economical and highly productive melting method. There is.

【０００４】電気エネルギ−によらないでスクラップを
溶解する方法として、例えば転炉型の反応容器を用い
て、炭材を鉄浴の内部に供給しつつ鉄浴上部から酸素ガ
スを吹き付けて、酸素ガスによる鉄浴中の炭素の燃焼熱
でスクラップを溶解する方法が試みられている。この溶
解方法においては、反応容器内の少量の鉄浴に上方から
スクラップを逐次供給して溶解し、鉄浴が所定の量にな
ってから出湯するが、出湯の際に一部の溶鉄を炉内に残
留させる、いわゆる残し湯方式がとられることが多い。As a method of melting scrap without using electric energy, for example, by using a converter-type reaction vessel, oxygen gas is blown from the upper portion of the iron bath while supplying carbonaceous material into the iron bath. Attempts have been made to melt scrap by the heat of combustion of carbon in an iron bath with gas. In this melting method, scrap is sequentially supplied from above to a small amount of iron bath in a reaction vessel and melted, and the molten iron is discharged when the iron bath reaches a predetermined amount. In many cases, a so-called residual hot water system is used in which the residual hot water is left inside.

【０００５】残し湯方式の溶解方法においては、鉄浴が
冷却されて固化しないように、鉄浴中の炭素濃度を少な
くとも３％程度以上に保つ必要があり、所定の炭素濃度
の溶鋼を得るためには、別途に脱炭反応を行わせる炉が
必要となる。In the residual hot water melting method, it is necessary to keep the carbon concentration in the iron bath at least about 3% so that the iron bath is not cooled and solidified, and in order to obtain molten steel having a predetermined carbon concentration. Requires a separate furnace for the decarburization reaction.

【０００６】一方、炭材の燃焼エネルギ−を有効に利用
するためには、溶解炉内での二次燃焼率(排ガス中の((%
CO2)/((%CO)+(%CO2))×100(%))を高める必要があること
は、すでによく知られているところである。On the other hand, in order to effectively use the combustion energy of the carbonaceous material, the secondary combustion rate in the melting furnace (((%
It is already well known that it is necessary to increase CO 2 ) / ((% CO) + (% CO 2 )) × 100 (%)).

【０００７】スクラップ溶解炉で二次燃焼率を高める方
法としては、例えば特開平２−１４１５１１号公報に開
示されているように、鉄浴の上部に所定量(例えば溶鉄
トン当り350kg以上)の溶融スラグを置き、溶融スラグ層
内に多量の炭材を懸濁させて、上吹き酸素ガスで燃焼さ
せる方法がある。As a method for increasing the secondary combustion rate in a scrap melting furnace, for example, as disclosed in JP-A-2-141511, a predetermined amount (for example, 350 kg or more per ton of molten iron) of a molten metal is melted in the upper part of an iron bath. There is a method of placing slag, suspending a large amount of carbonaceous material in the molten slag layer, and burning it with top-blown oxygen gas.

【０００８】この溶解方法では、溶融スラグ層内で発生
した炭材の燃焼熱を下方の鉄浴に伝達してスクラップの
溶解に有効に利用するため、鉄浴又は溶融スラグ層にガ
スを吹き込んで撹拌することが必要不可欠である。この
場合、溶融スラグ層内に懸濁した多量の炭材は溶鉄と接
触して、炭材中の炭素は溶鉄に溶解し、通常は炭素飽和
状態の溶鉄が得られる。したがって、この場合も所定の
炭素濃度の溶鋼を得るためには、別途に脱炭反応を行わ
せる炉が必要となる。In this melting method, the heat of combustion of the carbonaceous material generated in the molten slag layer is transferred to the lower iron bath to be effectively utilized for melting scrap, so that gas is blown into the iron bath or the molten slag layer. Stirring is essential. In this case, a large amount of carbonaceous material suspended in the molten slag layer comes into contact with the molten iron, the carbon in the carbonaceous material is dissolved in the molten iron, and normally molten iron in a carbon saturated state is obtained. Therefore, also in this case, in order to obtain molten steel having a predetermined carbon concentration, a separate furnace for performing a decarburization reaction is required.

【０００９】一般に高い生産性をもって高炭素の溶鉄の
脱炭を行うには、製鋼用転炉に相当する設備が必要であ
る。したがって、炭材の燃焼エネルギ−を主な熱源とし
てスクラップを溶解し所定の炭素濃度の溶鋼を得るため
には、スクラップ溶解炉の他に転炉設備を必要とし、各
々炉体関連設備の他に酸素供給設備や排ガス処理設備が
必要となって、多大な設備コストの負担が生ずるという
問題があった。Generally, in order to decarburize high carbon molten iron with high productivity, equipment equivalent to a steelmaking converter is required. Therefore, in order to melt scrap by using the combustion energy of carbonaceous material as a main heat source to obtain molten steel with a predetermined carbon concentration, converter equipment is required in addition to the scrap melting furnace. There has been a problem that an oxygen supply facility and an exhaust gas treatment facility are required, which causes a great burden of facility cost.

【００１０】[0010]

【発明が解決しようとする課題】本発明は、上記のよう
な従来技術の問題点を解決するためになされたものであ
って、その目的とするところは、炭材の燃焼エネルギ−
を主な熱源としてスクラップを溶解するに際して、炭材
中の炭素の溶鉄への溶解を抑制し、炭素含有量の少ない
溶鋼を得るスクラップの溶解方法を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to reduce the combustion energy of carbonaceous material.
An object of the present invention is to provide a scrap melting method for obtaining molten steel having a low carbon content by suppressing the melting of carbon in carbonaceous material into molten iron when melting scrap by using as a main heat source.

【００１１】またこれに加えて、無煙炭粉その他の安価
な炭材を用い、かつ溶解炉内における二次燃焼率を高め
て炭材の燃焼エネルギ−の利用効率を増大させることに
より、エネルギ−コストの低い鉄スクラップの溶解方法
を提供することを目的とする。In addition to this, by using anthracite carbon powder or other inexpensive carbonaceous material and increasing the secondary combustion rate in the melting furnace to increase the utilization efficiency of the combustion energy of the carbonaceous material, the energy cost can be reduced. An object of the present invention is to provide a method for melting iron scrap having a low content.

【００１２】[0012]

【課題を解決するための手段】本発明の発明者等は、ス
クラップ溶解炉において炭素濃度が１％以下の溶鋼を得
ることができれば、二次精錬炉における軽度の脱炭処理
により容易に所定の炭素濃度の溶鋼を得ることができる
ことから、炭材の燃焼エネルギ−を主な熱源とするスク
ラップ溶解において炭素濃度が１％以下の溶鋼を得る手
段について種々の検討を行った。本発明はこれらの検討
結果に基づくものであって、その要旨とするところは、 (1) 溶解炉の底部に溶鋼層とその隣接する上部に溶融ス
ラグ層を形成させた状態で溶融スラグ層内に炭材と酸素
含有ガスを供給して炭材を燃焼発熱させながら溶解炉の
上部から供給されたスクラップの溶解を行うに際して、
該溶融スラグ層に溶融スラグに対する重量比で５〜３０
％の炭材が存在するように炭材の供給速度を調節し、か
つ溶融スラグ層下面からの高さが溶融スラグ層厚さの
０．３５〜０．６５倍に相当する位置に少なくとも一つ
以上の羽口を設けて、溶融スラグ層内にガスを吹込むこ
とにより溶融スラグ層の上部のみを選択的に撹拌すると
共に、通電加熱用の電極棒を該電極棒の下端の溶融スラ
グ層下面からの高さが溶融スラグ層厚さの０．１〜０．
３倍に相当する位置に配して、溶融スラグ層下部に熱を
補給しながらスクラップの溶解を行い、炭素濃度が１％
以下の溶鋼を得ることを特徴とするスクラップの溶解方
法である。Means for Solving the Problems If the inventors of the present invention can obtain a molten steel having a carbon concentration of 1% or less in a scrap melting furnace, a predetermined decarburization treatment in a secondary refining furnace can be easily performed. Since molten steel with a carbon concentration can be obtained, various studies were conducted on means for obtaining a molten steel with a carbon concentration of 1% or less in scrap melting using the combustion energy of carbon material as the main heat source. The present invention is based on the results of these studies, and the gist thereof is as follows: (1) Inside the molten slag layer with the molten slag layer formed on the molten steel layer at the bottom of the melting furnace and its adjacent upper portion. When melting the scrap supplied from the upper part of the melting furnace while supplying carbonaceous material and oxygen-containing gas to
The molten slag layer has a weight ratio to the molten slag of 5 to 30.
% Of the carbonaceous material is adjusted so that at least one is located at a position where the height from the lower surface of the molten slag layer is 0.35 to 0.65 times the thickness of the molten slag layer. By providing the tuyere above and selectively agitating only the upper part of the molten slag layer by blowing gas into the molten slag layer, the electrode rod for electric heating is provided on the lower surface of the molten slag layer at the lower end of the electrode rod. Height of the molten slag layer is 0.1 to 0.
It is placed at a position equivalent to 3 times, and the scrap is melted while supplying heat to the bottom of the molten slag layer, and the carbon concentration is 1%.
This is a scrap melting method characterized by obtaining the following molten steel.

【００１３】(2) 粉状の炭材を有効に利用する方法とし
て、溶融スラグ層下面からの高さが溶融スラグ層厚さの
０．３５〜０．６５倍に相当する位置に羽口を少なくと
も一つ以上設けて、該羽口から溶融スラグ層中に炭材と
酸素含有ガスとを供給すると共に、該位置に前記羽口と
は別の羽口を少なくとも一つ以上設けて、これら別の羽
口から溶融スラグ層中に炭材と不活性ガスとを供給する
ことを特徴とする前項(1)記載のスクラップの溶解方法
である。(2) As a method of effectively utilizing powdery carbonaceous material, tuyere is placed at a position where the height from the lower surface of the molten slag layer is 0.35 to 0.65 times the thickness of the molten slag layer. At least one or more are provided to supply the carbonaceous material and the oxygen-containing gas from the tuyere into the molten slag layer, and at least one tuyere different from the tuyere is provided at that position, and The method for melting scrap according to (1) above, wherein the carbonaceous material and the inert gas are supplied from the tuyere to the molten slag layer.

【００１４】(3) また溶鋼層に相当する高さ位置の溶解
炉壁面部又は底面部にチャンネル型誘導加熱装置を配し
て溶鋼に熱を供給することを特徴とする前項(1)又は(2)
記載のスクラップの溶解方法である。(3) Further, a channel type induction heating device is arranged on the wall surface or bottom surface of the melting furnace at a height position corresponding to the molten steel layer to supply heat to the molten steel. 2)
This is the method of melting scrap described.

【００１５】(4) さらに通電加熱用の電極棒及びチャン
ネル型誘導加熱装置に投入される電気エネルギ−の供給
速度Ｅ(ｊ／ｈ)と溶解炉内で炭材の燃焼により発生する
熱エネルギ−の供給速度Ｃ(ｊ／ｈ)に関して、Ｅ／（Ｅ
＋Ｃ)≧０．２の関係を満たしながら溶解を行うことを
特徴とする前項(1)から(3)までに記載のスクラップの溶
解方法である。(4) Further, the supply rate E (j / h) of electric energy supplied to the electrode rod for electric heating and the channel type induction heating apparatus and the thermal energy generated by combustion of carbonaceous material in the melting furnace. Regarding the supply rate C (j / h) of E / (E
+ C) ≧ 0.2, the melting is performed while satisfying the relationship, and the scrap melting method described in any one of (1) to (3) above.

【００１６】[0016]

【発明の実施の形態】図１に本発明を実施するためのス
クラップ溶解装置の例を示す。溶解炉炉体１は耐火物７
で内張りされ、炉内には底部に溶鋼層２とその上部に十
分な高さの溶融スラグ層３が形成されている。炉体側面
にはガス又はガスと炭材を吹き込むための羽口４ａ，４
ｂとその下方に電極棒挿入孔が設けられ、通電加熱用の
電極棒５が溶融スラグ層内に挿入されている。また必要
な場合は、炉の上部より上吹きランス６が炉内に挿入さ
れる。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a scrap melting apparatus for carrying out the present invention. Melting furnace furnace body 1 is refractory 7
In the furnace, a molten steel layer 2 is formed at the bottom and a molten slag layer 3 having a sufficient height is formed above the molten steel layer 2. Tuyers 4a, 4 for blowing gas or gas and carbonaceous material on the side of the furnace body
An electrode rod insertion hole is provided in b and below it, and an electrode rod 5 for electric heating is inserted in the molten slag layer. If necessary, the upper blowing lance 6 is inserted into the furnace from above the furnace.

【００１７】炭材は所定の供給速度で炉の上部より投入
され又は羽口４ａ，４ｂから溶融スラグ層に吹き込まれ
て、上吹きランス６又は／及び羽口４ａ，４ｂより供給
される酸素含有ガスにより燃焼する。スクラップは炉の
上部から所定の供給速度で連続的又は間歇的に投入さ
れ、炭材の燃焼熱及び電極棒によるア−ク加熱又は抵抗
加熱により、逐次加熱溶解される。本発明の溶解方法に
おいては、十分な高さを持った溶融スラグ層の内部に多
量の炭材を懸濁させ、これに酸素含有ガスを吹き付けて
燃焼させることにより、二次燃焼率を例えば５０％以上
の高い値とすることができる。The carbonaceous material is charged from the upper part of the furnace at a predetermined supply rate or blown into the molten slag layer from the tuyere 4a, 4b, and is supplied with oxygen from the upper blowing lance 6 and / or tuyere 4a, 4b. Burns with gas. The scrap is continuously or intermittently charged from the upper part of the furnace at a predetermined supply rate, and is sequentially heated and melted by the combustion heat of the carbonaceous material and the arc heating or resistance heating by the electrode rod. In the melting method of the present invention, a large amount of carbonaceous material is suspended inside a molten slag layer having a sufficient height, and an oxygen-containing gas is blown onto the carbonaceous material to burn the carbonaceous material, so that the secondary combustion rate is, for example, 50 It can be a high value of at least%.

【００１８】この燃焼熱をスクラップの溶解に有効に利
用するためには、ある程度まで溶融スラグ層を撹拌する
ことが必要である。一方、過度に撹拌すると溶融スラグ
層内に懸濁している炭材が溶鋼と接触して溶解し、炭素
濃度１％以下の溶鋼を直接得ることができない。このよ
うな伝熱の促進と炭材の溶解抑制という二つの相反する
目的を同時に満たすために、溶融スラグ層内に懸濁して
いる炭材の量を調節し、かつガスを吹き込む羽口４ａ，
４ｂの位置を適正に設定して溶融スラグ層の上部のみを
選択的に撹拌することが必要である。In order to effectively utilize this combustion heat for melting scrap, it is necessary to stir the molten slag layer to some extent. On the other hand, if it is agitated excessively, the carbonaceous material suspended in the molten slag layer comes into contact with the molten steel and melts, so that the molten steel having a carbon concentration of 1% or less cannot be directly obtained. In order to simultaneously satisfy the two contradictory purposes of accelerating heat transfer and suppressing dissolution of carbonaceous material, the amount of carbonaceous material suspended in the molten slag layer is adjusted and the tuyere 4a for blowing gas,
It is necessary to properly set the position of 4b and selectively stir only the upper portion of the molten slag layer.

【００１９】まず、溶融スラグ層内に懸濁している炭材
の量は、溶融スラグに対する重量比(以下「炭材重量比」
という)で５〜３０％の範囲内にしなければならない。
炭材重量比の下限を５％とするのは、これ以下では酸素
含有ガスと炭材の接触が不十分となり未反応の酸素が生
ずることのほか、伝熱媒体として寄与する炭材の量が少
なく伝熱面でも不利になるためである。First, the amount of carbonaceous material suspended in the molten slag layer is determined by the weight ratio to the molten slag (hereinafter referred to as "carbonaceous material weight ratio").
It must be within the range of 5 to 30%.
The lower limit of the carbonaceous material weight ratio is set to 5%. Below this, the contact between the oxygen-containing gas and the carbonaceous material becomes insufficient and unreacted oxygen is generated, and the amount of carbonaceous material that contributes as a heat transfer medium is This is because there is little heat transfer, which is disadvantageous.

【００２０】また、炭材重量比の上限を３０％とするの
は、これ以上ではガスを吹き込む羽口４ａ，４ｂの位置
を適正に選択しても炭材と溶鋼の接触が避けられず、炭
素濃度１％以下の溶鋼を得ることが困難なためである。Further, the upper limit of the carbonaceous material weight ratio is set to 30%. Above this, contact between the carbonaceous material and molten steel cannot be avoided even if the positions of the tuyere 4a, 4b for blowing gas are properly selected. This is because it is difficult to obtain molten steel having a carbon concentration of 1% or less.

【００２１】次に、ガスを吹き込む羽口４ａ，４ｂの溶
融スラグ層下面からの高さ(以下「羽口高さ」という)は、
溶融スラグ層厚さの０．３５〜０．６５倍の範囲内にし
なければならない。羽口高さの上限を溶融スラグ層厚さ
の０．６５倍とするのは、これ以上では吹き込んだガス
の吹き抜けが起こり易く、ガスによる溶融スラグの撹拌
の効率が悪くなるためである。Next, the height of the tuyere 4a, 4b into which the gas is blown from the lower surface of the molten slag layer (hereinafter referred to as "tuyere height") is
It should be within the range of 0.35 to 0.65 times the thickness of the molten slag layer. The upper limit of the tuyere height is set to 0.65 times the thickness of the molten slag layer, because when the tuyere height is higher than this, the blown gas is likely to blow through, and the efficiency of stirring the molten slag by the gas deteriorates.

【００２２】また、羽口高さの下限を溶融スラグ層厚さ
の０．３５倍とするのは、これ以下では溶融スラグ層の
上部のみを選択的に撹拌することが困難になり、炭材と
溶鋼の接触が避けられず、炭素濃度１％以下の溶鋼を得
ることが困難になるためである。Further, if the lower limit of the tuyere height is set to 0.35 times the thickness of the molten slag layer, it becomes difficult to selectively agitate only the upper portion of the molten slag layer because the lower limit is less than 0.35 times. This is because contact between the molten steel and molten steel is unavoidable, and it becomes difficult to obtain molten steel having a carbon concentration of 1% or less.

【００２３】これらの手段により、伝熱の促進と炭材の
溶解抑制という二つの目的をある程度まで同時に達成で
きるが、実施例に示すような実験的検討から、炭材の燃
焼熱だけでは溶融スラグ層下部及び溶鋼層への熱の供給
が十分でないことが明らかになった。そのため本発明の
溶解方法においては、補助的な熱源として溶融スラグ層
下部に電極棒５を挿入して通電加熱を行う。By these means, the two purposes of promoting heat transfer and suppressing dissolution of carbonaceous material can be achieved at the same time to some extent. However, from the experimental study as shown in the examples, it is possible to use only the combustion heat of carbonaceous material for the molten slag. It was revealed that the heat supply to the lower part of the layer and the molten steel layer was not sufficient. Therefore, in the melting method of the present invention, the electrode rod 5 is inserted below the molten slag layer as an auxiliary heat source to perform electric heating.

【００２４】通電加熱の方法としては、黒鉛電極やプラ
ズマト−チを用いる方法があるが、前者の方が設備コス
トや熱効率の面から有利である。黒鉛電極を用いる場合
には、直流、交流のア−ク加熱の他、スラグの電気抵抗
を利用した抵抗加熱も可能である。また、一対の黒鉛電
極を両極として使用する方法及び溶鋼層内に炉底電極を
設けて対極とする方法共に適用可能である。As a method of energizing and heating, there is a method of using a graphite electrode or a plasma torch, but the former is more advantageous in terms of equipment cost and thermal efficiency. When using a graphite electrode, in addition to DC and AC arc heating, resistance heating using the electric resistance of slag is also possible. Further, both a method of using a pair of graphite electrodes as both electrodes and a method of providing a furnace bottom electrode in the molten steel layer to form a counter electrode are applicable.

【００２５】通電加熱を行う場合、溶融スラグ層内にお
ける電極棒下端の位置が問題で、電極棒下端の溶融スラ
グ層下面からの高さは溶融スラグ層厚さの０．１〜０．
３倍の範囲内とする必要がある。下端の高さの下限を溶
融スラグ層厚さの０．１倍とするのは、これ以下では溶
鋼層高さの変動により電極棒が溶鋼中に浸漬する危険が
あり、また下端の高さの上限を溶融スラグ層厚さの０．
３倍とするのは、これ以上では通電加熱により発生する
熱の溶鋼層への伝達が不十分となるためである。When conducting electric heating, the position of the lower end of the electrode rod in the molten slag layer is a problem, and the height of the lower end of the electrode rod from the lower surface of the molten slag layer is 0.1 to 0.
It is necessary to be within the range of 3 times. The lower limit of the height of the lower end is set to 0.1 times the thickness of the molten slag layer. Below this, there is a risk that the electrode rod will be immersed in the molten steel due to fluctuations in the height of the molten steel layer. The upper limit is the molten slag layer thickness of 0.
The reason for making the number three times is that the heat generated by the energization heating is insufficiently transferred to the molten steel layer if the number is more than three times.

【００２６】なお、黒鉛電極棒の消耗に対処するため、
炉体側面に設けた電極棒挿入孔と電極棒との間隙をシ−
ルしつつ、電極棒を前進後退可能な構造にすることが望
ましい。また、電極棒を斜め下方に挿入すれば、電極棒
の前進後退によりある程度の範囲で電極棒下端と溶鋼層
表面との間隔を調整することが可能である。In order to deal with the consumption of the graphite electrode rod,
The gap between the electrode rod and the electrode rod insertion hole provided on the side of the furnace
It is desirable to have a structure in which the electrode rod can be moved forward and backward while it is installed. Further, if the electrode rod is inserted obliquely downward, it is possible to adjust the distance between the lower end of the electrode rod and the surface of the molten steel layer within a certain range by moving the electrode rod forward and backward.

【００２７】本発明の溶解法では、当初溶鋼量が比較的
少ない状態でスクラップの供給を開始し、溶鋼量が所定
の値まで増加したところで、出鋼孔８を開口して溶鋼の
一部を排出し、当初の溶鋼量のレベルから次回の溶解を
開始する。この間溶鋼層表面の高さの変動を小さくする
ために、炉底部の大きい炉体構造、例えば、図１に示す
ようないわゆるサイフォン型の炉底部構造にすることも
有効である。In the melting method of the present invention, the supply of scrap is initially started in a state where the amount of molten steel is relatively small, and when the amount of molten steel increases to a predetermined value, the tap hole 8 is opened to remove a part of the molten steel. Discharge and start the next melting from the level of the amount of molten steel at the beginning. In order to reduce the fluctuation of the height of the molten steel layer surface during this time, it is also effective to adopt a furnace structure having a large furnace bottom, for example, a so-called siphon type furnace bottom structure as shown in FIG.

【００２８】本発明の溶解方法においては、安価な炭材
例えば微粉炭(とくに粉状の無煙炭)を使用することが重
要である。一般に、粉状の炭材を炉の上部から投入する
と排ガスの上昇気流に同伴されて炉外に飛散する。その
ため、前記ガス吹き込み羽口と同じ高さ位置の範囲で、
炉体側面に炭材と酸素含有ガスとを供給する少なくとも
一つ以上の羽口４ａと、炭材と不活性ガスとを供給する
少なくとも一つ以上の別の羽口４ｂを設けることが有効
である。In the melting method of the present invention, it is important to use an inexpensive carbon material such as pulverized coal (particularly powdery anthracite). Generally, when a powdery carbonaceous material is charged from the upper part of the furnace, it is entrained in the upward flow of exhaust gas and scattered outside the furnace. Therefore, in the range of the same height position as the gas blowing tuyere,
It is effective to provide at least one tuyere 4a for supplying the carbonaceous material and the oxygen-containing gas and at least one other tuyere 4b for supplying the carbonaceous material and the inert gas on the side surface of the furnace body. is there.

【００２９】炭材と酸素含有ガスとを供給する羽口を設
ける理由は、吹き込んだ粉状の炭材を溶融スラグ層の内
部で燃焼させ、その燃焼熱を熱効率良く溶融スラグに伝
達するためである。また、これと併せて炭材と不活性ガ
スとを供給する少なくとも一つ以上の別の羽口を設ける
理由は、粉状の炭材を酸素含有ガスで燃焼させる羽口の
みでは、溶融スラグ層内に懸濁している炭材の量を調節
することが難しいためである。The reason for providing the tuyere for supplying the carbonaceous material and the oxygen-containing gas is to burn the blown powdery carbonaceous material inside the molten slag layer and transfer the combustion heat to the molten slag with good thermal efficiency. is there. Further, the reason for providing at least one or more separate tuyere for supplying the carbonaceous material and the inert gas together with this is that the molten slag layer is formed only by the tuyere burning the powdery carbonaceous material with the oxygen-containing gas. This is because it is difficult to control the amount of carbonaceous material suspended inside.

【００３０】すなわち、溶融スラグ層内に存在する炭材
の量を、スラグをサンプリングして計測するか或いは炭
素収支等から推定して、これら別の羽口からの炭材の供
給速度を調節することにより、炭材重量比を５〜３０％
の範囲内に調節することが可能になる。That is, the amount of the carbonaceous material existing in the molten slag layer is measured by sampling the slag or estimated from the carbon balance and the like, and the feeding rate of the carbonaceous material from these other tuyeres is adjusted. By doing so, the carbonaceous material weight ratio is 5 to 30%
It becomes possible to adjust within the range of.

【００３１】また、本発明の溶解方法においては、溶鋼
層の温度をその融点以上例えば１５００〜１５５０℃以
上に維持する必要があり、前記の炭材の燃焼熱や電極棒
による通電加熱の熱量では溶鋼温度を十分高く維持でき
ない場合がある。そのため、図１に示すように、溶鋼層
に相当する高さ位置の溶解炉壁面部又は底面部にチャン
ネル型誘導加熱装置９を配して溶鋼に熱を供給すること
も有効である。Further, in the melting method of the present invention, it is necessary to maintain the temperature of the molten steel layer at its melting point or higher, for example, 1500 to 1550 ° C. or higher. The molten steel temperature may not be maintained sufficiently high. Therefore, as shown in FIG. 1, it is also effective to supply the heat to the molten steel by disposing the channel-type induction heating device 9 on the wall surface portion or the bottom surface portion of the melting furnace at the height position corresponding to the molten steel layer.

【００３２】チャンネル型誘導加熱装置９は、例えば断
面が溝型の炉外に突出した耐火物製の溶鋼の還流路を設
け、該還流路の外周に誘導加熱用コイルを配して、還流
路内の溶鋼を加熱するものである。このように、チャン
ネル型誘導加熱装置９を設置することにより溶鋼層の温
度が均一になり、より安定なスクラップの溶解が可能に
なる。The channel type induction heating device 9 is provided with, for example, a refractory molten steel reflux path projecting outside the furnace having a groove-shaped cross section, and an induction heating coil is arranged on the outer circumference of the reflux path to provide a reflux path. The molten steel inside is heated. As described above, by installing the channel-type induction heating device 9, the temperature of the molten steel layer becomes uniform, and more stable scrap melting becomes possible.

【００３３】さらに、本発明の溶解方法においては、通
電加熱及び誘導加熱により供給される熱量が少な過ぎる
場合、必然的に炭材の燃焼熱を増大させざるを得なくな
り、溶融スラグ層の上部が過熱されて炉壁耐火物への悪
影響が大きい。そのため、通電加熱用の電極棒及びチャ
ンネル型誘導加熱装置に投入される電気エネルギ−の供
給速度Ｅ（ｊ／ｈ)と溶解炉内で炭材の燃焼により発生
する熱エネルギ−の供給速度Ｃ(ｊ／ｈ)に関して、Ｅ／
（Ｅ＋Ｃ)≧０．２の関係を満たしながら溶解を行うこ
とが望ましい。Further, in the melting method of the present invention, when the amount of heat supplied by electric heating and induction heating is too small, the combustion heat of the carbonaceous material is inevitably increased, and the upper part of the molten slag layer is inevitably increased. It is overheated and has a large adverse effect on the furnace wall refractory. Therefore, the supply rate E (j / h) of electric energy input to the electrode rod for electric heating and the channel-type induction heating device and the supply rate C (of thermal energy generated by combustion of carbonaceous material in the melting furnace) j / h), E /
It is desirable to carry out dissolution while satisfying the relationship of (E + C) ≧ 0.2.

【００３４】[0034]

【実施例】容量７tonの試験転炉を改造し、炉底部にチ
ャンネル型誘導加熱装置と炉腹下部に通電加熱用黒鉛電
極を取付けて、本発明のスクラップ溶解法に関する試験
を行った。スクラップ溶解中の溶鋼層高さの変動を小さ
くするため、種湯溶鋼量を約３tonとし、これに１．０
〜１．５tonのスクラップを供給して溶解を行った。溶
解前後の溶鋼層高さの変動はほぼ１０cm以内である。種
湯装入後CaO及びSiO2を主成分とする造滓材２〜３tonを
炉内に投入して溶解し、溶融スラグ層を形成させた。溶
解中のスラグがフォ−ミングしている状態で、溶融スラ
グ層厚さが約１．５mになるように造滓材の投入量を調
節した。EXAMPLE A test converter having a capacity of 7 tons was remodeled, a channel type induction heating device was attached to the bottom of the furnace, and a graphite electrode for electric heating was attached to the lower part of the furnace belly, and a test on the scrap melting method of the present invention was conducted. To reduce the fluctuation of molten steel layer height during scrap melting, the amount of molten steel in the seed bath was set to about 3 tons,
Dissolution was performed by supplying ~ 1.5 ton of scrap. The fluctuation of the molten steel layer height before and after melting is within about 10 cm. After charging the seed hot water, 2 to 3 ton of slag material containing CaO and SiO 2 as main components was put into the furnace and melted to form a molten slag layer. The amount of the slag material was adjusted so that the molten slag layer had a thickness of about 1.5 m while the molten slag was forming.

【００３５】ガス吹き込み羽口の位置は、羽口の溶融ス
ラグ層下面からの高さをＨ、溶融スラグ層の厚さをＨ0
として、Ｈ／Ｈ0＝０．２〜０．７の範囲で変更して、
溶融スラグ層内にＮ2ガスを吹き込んだ。所定の高さの
溶融スラグ層が形成されたところで、上吹きランスによ
る吹酸と炭材の投入を開始し、同時にスクラップを炉の
上部から所定の供給速度で半連続的に炉内に投入して溶
解を行った。炭材としては塊コ−クス又は塊状の無煙炭
を炉の上部から供給した。溶解中に溶鋼の温度が所定の
値、例えば1520〜1570℃になるように、誘導加熱装置及
び通電加熱用電極への投入電力を調整した。主な操業条
件は下記のとおりである。With respect to the position of the gas-injected tuyere, the height of the tuyere from the lower surface of the molten slag layer is H, and the thickness of the molten slag layer is H 0.
As H / H 0 = 0.2 to 0.7,
N 2 gas was blown into the molten slag layer. When the molten slag layer with a predetermined height was formed, the injection of blowing acid and carbonaceous material by the upper blowing lance was started, and at the same time, the scrap was introduced semi-continuously from the top of the furnace into the furnace at a specified supply rate. And dissolved. As the carbonaceous material, lump coke or lump-shaped anthracite was supplied from the upper part of the furnace. The electric power supplied to the induction heating device and the electrode for electrical heating was adjusted so that the temperature of the molten steel reached a predetermined value during melting, for example, 1520 to 1570 ° C. The main operating conditions are as follows.

【００３６】 スクラップの供給速度 ５〜１５ton/hr 酸素ガス供給速度 ５００〜１５００Nm3/hr 炭材供給速度 ３００〜８００Kg/hr 撹拌用Ｎ2ガス供給速度 １０〜３０Nm3/hr 二次燃焼率 ３０〜７０ ％ 本発明の溶解方法によりＣ濃度１％以下の溶鋼が得られ
るか否かを明らかにするため、種湯溶鋼のＣ濃度を０．
７〜１．０％とし、スクラップ溶解の前後での溶鋼Ｃ濃
度の変化を調査した。The feed rate 5~15ton / hr oxygen gas supply rate 500 to 1500 nm 3 / hr carbonaceous material feed rate 300~800Kg / hr stirring for N 2 gas feed rate 10 to 30 nm 3 / hr post combustion ratio of the scrap 30 70% In order to clarify whether or not molten steel having a C concentration of 1% or less can be obtained by the melting method of the present invention, the C concentration of the molten steel in the seed bath is set to 0.
It was set to 7 to 1.0%, and changes in the molten steel C concentration before and after scrap melting were investigated.

【００３７】図２に羽口高さの溶融スラグ層厚さに対す
る比(Ｈ／Ｈ0)と溶解前後の溶鋼Ｃ濃度の変化(△[C］＝
溶解後[C]−溶解前[C])との関係を示す。Ｈ／Ｈ0が０．
３５以下では△[C]が急激に増加する。このことから羽
口高さが低いと、溶融スラグ層内の炭材が溶鋼と接触し
て溶解し易くなることが分かる。FIG. 2 shows the ratio of the tuyere height to the thickness of the molten slag layer (H / H 0 ) and the change in molten steel C concentration before and after melting (Δ [C] =
The relation between [C] after dissolution-before [C]) is shown. H / H 0 is 0.
Below 35, △ [C] increases rapidly. From this, it is understood that when the tuyere height is low, the carbonaceous material in the molten slag layer comes into contact with the molten steel and is likely to be melted.

【００３８】図３に溶融スラグ中の炭材の重量比と溶解
前後の溶鋼Ｃ濃度の変化(△[C])との関係を示す。炭材
重量比が０．３を超えると△[C]が急激に増加する。ま
た炭材重量比が０．０５以下では△[C]がマイナスにな
ると共にスラグ中の酸化鉄が増加して溶解が不安定にな
る。FIG. 3 shows the relationship between the weight ratio of the carbonaceous material in the molten slag and the change in molten steel C concentration before and after melting (Δ [C]). When the carbonaceous material weight ratio exceeds 0.3, Δ [C] rapidly increases. Further, when the carbonaceous material weight ratio is 0.05 or less, Δ [C] becomes negative and the iron oxide in the slag increases and the dissolution becomes unstable.

【００３９】次に、本発明の溶解方法において、炭材の
燃焼エネルギ−と電気エネルギ−の供給速度の比率の適
正な範囲を明らかにする目的で、この比率を変更して溶
解試験を行った。電気エネルギ−の供給速度Ｅは誘導加
熱装置及び通電加熱用電極へ供給された電力の合計で、
溶鋼温度が所定の値になるように調節する。これに対
し、炭材及び酸素ガスの供給速度を変えてスクラップの
溶解を行い、溶融スラグ層と溶鋼層の温度にアンバラン
スが生ずるか否かを調査した。炭材の燃焼による熱エネ
ルギ−の供給速度Ｃは、炭材供給速度と二次燃焼率から
算出した。Next, in the melting method of the present invention, for the purpose of clarifying the proper range of the ratio of the combustion energy of the carbonaceous material to the supply rate of the electric energy, a melting test was conducted by changing this ratio. . The supply rate E of the electric energy is the total of the electric power supplied to the induction heating device and the electrode for electric heating,
The molten steel temperature is adjusted so as to reach a predetermined value. On the other hand, scrap was melted by changing the supply rates of carbonaceous material and oxygen gas, and it was investigated whether or not there was an imbalance in the temperatures of the molten slag layer and the molten steel layer. The supply rate C of thermal energy by the combustion of the carbonaceous material was calculated from the carbonaceous material supply rate and the secondary combustion rate.

【００４０】図４に全入力エネルギ−に対する電気エネ
ルギ−の比率(Ｅ/(Ｅ＋Ｃ))と溶融スラグ層と溶鋼層の
温度差の関係を示す。Ｅ/(Ｅ＋Ｃ)の値が０．２以下に
なると溶融スラグ層の温度が著しく上昇し、安定なスク
ラップ溶解が困難になると共に耐火物の溶損が顕著にな
る。FIG. 4 shows the relationship between the ratio of electric energy to total input energy (E / (E + C)) and the temperature difference between the molten slag layer and the molten steel layer. When the value of E / (E + C) is 0.2 or less, the temperature of the molten slag layer rises remarkably, stable melting of scrap becomes difficult, and melting loss of refractory becomes remarkable.

【００４１】[0041]

【発明の効果】本発明により、炭材の燃焼エネルギ−を
主な熱源としてスクラップを溶解するに際して、炭材中
の炭素の溶鉄への溶解を抑制し、炭素含有量の少ない溶
鋼を得ることが可能になった。またこれに加えて、無煙
炭粉その他の安価な炭材を用い、かつ溶解炉内における
二次燃焼率を高めて炭材の燃焼エネルギ−の利用効率を
増大させることにより、エネルギ−コスト及び設備コス
ト共に低廉に鉄スクラップを溶解することが可能になっ
た。According to the present invention, when the scrap is melted by using the combustion energy of the carbonaceous material as a main heat source, it is possible to suppress the dissolution of carbon in the carbonaceous material into the molten iron and obtain a molten steel having a low carbon content. It became possible. In addition to this, by using anthracite powder and other inexpensive carbonaceous materials, and increasing the secondary combustion rate in the melting furnace to increase the utilization efficiency of the combustion energy of the carbonaceous materials, energy cost and equipment cost can be increased. Both made it possible to melt iron scrap at low cost.

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

【図１】本発明を実施するためのスクラップ溶解装置の
例を示す図である。FIG. 1 is a diagram showing an example of a scrap melting apparatus for carrying out the present invention.

【図２】羽口高さの溶融スラグ層厚さに対する比と溶解
前後の溶鋼Ｃ濃度の変化との関係を示す図である。FIG. 2 is a diagram showing the relationship between the ratio of tuyere height to molten slag layer thickness and the change in molten steel C concentration before and after melting.

【図３】溶融スラグ中の炭材の重量比と溶解前後の溶鋼
Ｃ濃度の変化との関係を示す図である。FIG. 3 is a diagram showing a relationship between a weight ratio of carbonaceous material in molten slag and a change in molten steel C concentration before and after melting.

【図４】全入力エネルギ−に対する電気エネルギ−の比
率と溶融スラグ層と溶鋼層の温度差の関係を示す図であ
る。FIG. 4 is a diagram showing a relationship between a ratio of electric energy to total input energy and a temperature difference between a molten slag layer and a molten steel layer.

【符号の説明】[Explanation of symbols]

１ 溶解炉炉体 ２ 溶鋼層 ３ 溶融スラグ層 ４ａ，４ｂ ガス又はガスと炭材を吹き込む羽口 ５ 電極棒 ６ 上吹きランス ７ 耐火物 ８ 出鋼口 ９ チャンネル型誘導加熱装置 1 melting furnace furnace body 2 molten steel layer 3 molten slag layer 4a, 4b tuyere for blowing gas or gas and carbonaceous material 5 electrode rod 6 top blowing lance 7 refractory 8 steel exit port 9 channel type induction heating device

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 溶解炉の底部に溶鋼層とその隣接する上
部に溶融スラグ層を形成させた状態で溶融スラグ層内に
炭材と酸素含有ガスを供給して炭材を燃焼発熱させなが
ら溶解炉の上部から供給されたスクラップの溶解を行う
に際して、該溶融スラグ層に溶融スラグに対する重量比
で５〜３０％の炭材が存在するように炭材の供給速度を
調節し、かつ溶融スラグ層下面からの高さが溶融スラグ
層厚さの０．３５〜０．６５倍に相当する位置に少なく
とも一つ以上の羽口を設けて、溶融スラグ層内にガスを
吹込むことにより溶融スラグ層の上部のみを選択的に撹
拌すると共に、通電加熱用の電極棒を該電極棒の下端の
溶融スラグ層下面からの高さが溶融スラグ層厚さの０．
１〜０．３倍に相当する位置に配して、溶融スラグ層下
部に熱を補給しながらスクラップの溶解を行い、炭素濃
度が１％以下の溶鋼を得ることを特徴とするスクラップ
の溶解方法。1. A molten steel layer is formed at the bottom of the melting furnace and a molten slag layer is formed at the upper portion adjacent to the molten steel layer, and the carbon material and the oxygen-containing gas are supplied into the molten slag layer to melt the carbon material while burning and generating heat. When melting the scrap supplied from the upper part of the furnace, the supply rate of the carbonaceous material is adjusted so that 5 to 30% by weight ratio of the carbonaceous material to the molten slag is present in the molten slag layer, and the molten slag layer is adjusted. At least one tuyere is provided at a position where the height from the lower surface corresponds to 0.35 to 0.65 times the thickness of the molten slag layer, and gas is blown into the molten slag layer to blow the molten slag layer. While selectively stirring only the upper portion of the molten slag layer, the height of the electrode rod for electric heating from the lower surface of the molten slag layer at the lower end of the electrode rod is 0.
A scrap melting method characterized in that the scrap is melted while being placed at a position corresponding to 1 to 0.3 times while supplying heat to the lower part of the molten slag layer to obtain molten steel having a carbon concentration of 1% or less. . 【請求項２】 溶融スラグ層下面からの高さが溶融スラ
グ層厚さの０．３５〜０．６５倍に相当する位置に羽口
を少なくとも一つ以上設けて、該羽口から溶融スラグ層
中に炭材と酸素含有ガスとを供給すると共に、該位置に
前記羽口とは別の羽口を少なくとも一つ以上設けて、こ
れら別の羽口から溶融スラグ層中に炭材と不活性ガスと
を供給することを特徴とする請求項１記載のスクラップ
の溶解方法。2. At least one tuyere is provided at a position where the height from the lower surface of the molten slag layer corresponds to 0.35 to 0.65 times the thickness of the molten slag layer, and the molten slag layer extends from the tuyere. While supplying carbonaceous material and oxygen-containing gas therein, at least one tuyere different from the tuyere is provided at the position, and the carbonaceous material and the carbonaceous material are inert to the molten slag layer from these other tuyere. Gas is supplied, The melting method of the scrap of Claim 1 characterized by the above-mentioned. 【請求項３】 溶鋼層に相当する高さ位置の溶解炉壁面
部又は底面部にチャンネル型誘導加熱装置を配して溶鋼
に熱を供給することを特徴とする請求項１又は請求項２
記載のスクラップの溶解方法。3. The method according to claim 1, wherein a channel-type induction heating device is arranged on the wall surface or the bottom surface of the melting furnace at a height position corresponding to the molten steel layer to supply heat to the molten steel.
Dissolution method of scrap described. 【請求項４】 通電加熱用の電極棒及びチャンネル型誘
導加熱装置に投入される電気エネルギ−の供給速度Ｅ
(ｊ／ｈ)と溶解炉内で炭材の燃焼により発生する熱エネ
ルギ−の供給速度Ｃ(ｊ／ｈ)に関して、下式の関係を満
たしながら溶解を行うことを特徴とする請求項１から請
求項３までに記載のスクラップの溶解方法。 Ｅ／（Ｅ＋Ｃ)≧０．２4. A supply speed E of electric energy supplied to an electrode rod for electric heating and a channel type induction heating device.
(j / h) and the supply rate C (j / h) of the thermal energy generated by the combustion of the carbonaceous material in the melting furnace, the melting is performed while satisfying the relationship of the following formula: The scrap melting method according to claim 3. E / (E + C) ≧ 0.2
JP32448695A 1995-12-13 1995-12-13 Scrap melting method Withdrawn JPH09165613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32448695A JPH09165613A (en) 1995-12-13 1995-12-13 Scrap melting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32448695A JPH09165613A (en) 1995-12-13 1995-12-13 Scrap melting method

Publications (1)

Publication Number Publication Date
JPH09165613A true JPH09165613A (en) 1997-06-24

Family

ID=18166350

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32448695A Withdrawn JPH09165613A (en) 1995-12-13 1995-12-13 Scrap melting method

Country Status (1)

Country Link
JP (1) JPH09165613A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102374781A (en) * 2010-08-17 2012-03-14 济源市万洋冶炼(集团)有限公司 Direct lead-smelting comprehensive metallurgical device and smelting process
CN108204742A (en) * 2018-01-31 2018-06-26 中国恩菲工程技术有限公司 Electromagnetism submerged combustion smelting device
CN108253786A (en) * 2018-01-31 2018-07-06 中国恩菲工程技术有限公司 Electromagnetism submerged combustion smelting device
CN108253787A (en) * 2018-01-31 2018-07-06 中国恩菲工程技术有限公司 Electromagnetism submerged combustion smelting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102374781A (en) * 2010-08-17 2012-03-14 济源市万洋冶炼(集团)有限公司 Direct lead-smelting comprehensive metallurgical device and smelting process
CN108204742A (en) * 2018-01-31 2018-06-26 中国恩菲工程技术有限公司 Electromagnetism submerged combustion smelting device
CN108253786A (en) * 2018-01-31 2018-07-06 中国恩菲工程技术有限公司 Electromagnetism submerged combustion smelting device
CN108253787A (en) * 2018-01-31 2018-07-06 中国恩菲工程技术有限公司 Electromagnetism submerged combustion smelting device

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