JP2998610B2 - Dissolution method of tin plated steel sheet scrap - Google Patents
Dissolution method of tin plated steel sheet scrapInfo
- Publication number
- JP2998610B2 JP2998610B2 JP24926595A JP24926595A JP2998610B2 JP 2998610 B2 JP2998610 B2 JP 2998610B2 JP 24926595 A JP24926595 A JP 24926595A JP 24926595 A JP24926595 A JP 24926595A JP 2998610 B2 JP2998610 B2 JP 2998610B2
- Authority
- JP
- Japan
- Prior art keywords
- scrap
- furnace
- tuyere
- gas
- plated 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
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
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】この発明は、羽口を備えた筒
型炉を使用して溶解熱源に電力を用いずにスクラップを
溶解する方法であって、特に嵩比重の低い錫めっき鋼板
のスクラップを有効に活用して、高品位の転炉鋼相当鋼
や特殊鋼の製造に使用できる錫含有量の少ない溶鉄を製
造するとともに、再利用可能な形で錫が回収できる錫め
っき鋼板スクラップの溶解方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of melting scrap using a tubular furnace having tuyeres without using electric power as a heat source for melting, and particularly to a scrap of tin-plated steel sheet having a low bulk specific gravity. Effective use of steel to produce molten iron with a low tin content that can be used for the production of high-grade converter steel equivalent steel and specialty steel, as well as the melting of tin-plated steel scrap that can recover tin in a reusable form About the method.
【０００２】[0002]
【従来の技術】日本学術振興会、素材プロセシング69委
員会第１分科会、第２分科会合同研究会（平成２年８
月）における報告によれば、鋼スクラップの発生量は鋼
材の蓄積量の増加とともに年々 100万トン程度の割合で
増加し、西暦2000年の時点では市中スクラップ (市中
屑) の発生量は約4000万トン／年となり、粗鋼生産量の
45％に達すると予想されている。[Prior Art] The Japan Society for the Promotion of Science, Material Processing 69 Committee 1st Working Group, 2nd Working Group Joint Study Group (August 1990
According to the report on March), the amount of steel scrap generated increased at a rate of about one million tons annually with the increase in the accumulation of steel materials, and as of the year 2000, the amount of market scrap generated was Approximately 40 million tons / year,
It is expected to reach 45%.
【０００３】現在、市中屑の溶解製品化は大部分が電気
炉で行われている。特に近年は、製品種の拡大とコスト
低減とを図るべく、電気炉でスクラップや不純物希釈用
の直接還元鉄を溶解し、連続鋳造して圧延するという、
いわゆるミニミル方式が採用されつつある。[0003] At present, most of commercial wastes are commercialized in electric furnaces. In particular, in recent years, in order to increase the product type and reduce costs, melting of direct reduced iron for scrap and impurity dilution in an electric furnace, continuous casting and rolling,
The so-called mini-mill system is being adopted.
【０００４】一方、一貫製鉄所では、上述のスクラップ
増に対処し、高炉集約化の中で粗鋼生産量の変動に対応
できる鉄源を確保するため、溶解熱源に電力を用いずに
スクラップを溶解する技術の開発が進められている。On the other hand, at the integrated steelworks, in order to cope with the above-mentioned increase in scrap and secure an iron source that can cope with fluctuations in crude steel production during the blast furnace consolidation, scrap is melted without using electric power as a heat source for melting. The development of the technology to do it is progressing.
【０００５】近年、消費構造の高級化に伴って表面処理
鋼の市中屑も増加しつつあり、その一つに錫めっき鋼板
スクラップ (市中屑としては「ぶりき缶屑」と言われ
る) がある。[0005] In recent years, the market waste of surface-treated steel has been increasing along with the sophistication of the consumption structure, and one of the scraps is tin-plated steel scrap (the market waste is referred to as tin can waste). There is.
【０００６】錫（以下、Snと記す）は、製鋼段階で除去
することができない元素であり、しかも、鋼中にSnが0.
04％程度以上残留すると、熱間加工性や靱性等が低下す
るので、Snめっき鋼板スクラップを鉄源として再利用す
る際のSn除去技術が下記のようにいくつか提案されてい
る。[0006] Tin (hereinafter referred to as Sn) is an element that cannot be removed in the steel making stage, and moreover, Sn is contained in steel in an amount of 0.1%.
If it remains at about 04% or more, the hot workability, toughness, etc. decrease, and therefore, there have been proposed several Sn removal techniques when recycling Sn-plated steel scrap as an iron source as follows.
【０００７】Ａ法（特開平５−9600号公報参照）：実施
例によれば、筒型炉内にコークスと、スクラップまたは
スクラップおよび鉄鉱石とを層状に充填し、各充填層に
一次羽口、二次羽口から支燃性ガスを吹き込んで溶解、
還元を行う方法（特開平１−290711号公報に開示される
方法）を用い、不純物が少ないスクラップを装入した筒
型炉で不純物低含有溶銑を製造し、ぶりき缶プレス屑
(Sn含有量が例えば0.63重量％) のような不純物が高い
スクラップを装入した別の筒型炉で不純物高含有溶銑を
製造する。そして、二基の炉で製造した溶銑を合わせ湯
し、例えば、Sn：0.06重量％の溶銑を得るという方法で
ある。Method A (see JP-A-5-9600): According to the embodiment, coke and scrap or scrap and iron ore are filled in layers in a cylindrical furnace, and the primary tuyere is filled in each packed bed. , Blowing and blowing combustible gas from the secondary tuyeres,
Using a reduction method (method disclosed in JP-A-1-290711), a low-impurity content hot metal is produced in a cylindrical furnace charged with scrap having a small amount of impurities, and tin can press waste is produced.
A high impurity content hot metal is manufactured in another cylindrical furnace charged with scrap having a high impurity such as (Sn content is, for example, 0.63% by weight). Then, the hot metal produced in the two furnaces is combined and hot metal is obtained, for example, with a Sn content of 0.06% by weight.
【０００８】上記の「ぶりき缶プレス屑」とは、Snめっ
き鋼板製の多数の空缶（以下、ぶりき缶という）をプレ
ス成形して複数枚束ねた形状のもの（すなわち、束ねて
いるため空隙が小さいもの）の集合体である。[0008] The above-mentioned "tinned tin press waste" refers to a shape obtained by press-forming a number of empty tins (hereinafter referred to as tinned tins) made of Sn-plated steel sheet and bundling a plurality of them (that is, bundled). Therefore, the aggregate is small.
【０００９】Ｂ法（特願平６−２３５０号参照）：この
方法は、炉底から一次羽口を含むレベルまでコークス充
填層を、その上部に二次羽口を含むレベルまでスクラッ
プを主体とする充填層をそれぞれ形成させた後、一次羽
口から支燃性ガスまたは支燃性ガスと燃料を、二次羽口
から支燃性ガスを吹き込み、スクラップの少なくとも一
部として主に嵩密度の高いぶりき缶プレス屑のSnめっき
鋼板スクラップを用い、かつ二次羽口の支燃性ガス吹き
込み量を調整して二次燃焼率を50％以上に制御しながら
溶解し、脱Snを達成するものである。Method B (refer to Japanese Patent Application No. 6-2350): This method mainly comprises a coke packed bed from the furnace bottom to a level including a primary tuyere, and a scrap to a level including a secondary tuyere above the furnace. After the formation of the filling layers to be respectively formed, the combustion supporting gas or the combustion supporting gas and the fuel are blown from the primary tuyere, and the combustion supporting gas is blown from the secondary tuyere. Achieve Sn removal by using Sn-plated steel scrap of high tin can press scrap and dissolving while controlling the secondary combustion rate to 50% or more by adjusting the amount of flammable gas blown into the secondary tuyere. Things.
【００１０】[0010]
【発明が解決しようとする課題】上述の従来技術には、
それぞれ下記のような問題がある。SUMMARY OF THE INVENTION The above-mentioned prior art includes:
Each has the following problems.
【００１１】Ａ法：本質的な脱Sn技術ではなく、合わせ
湯による希釈法であるため、同時出銑可能な別の溶解炉
が必要となり、設備費、操業費およびコスト面から経済
性に劣る。Method A: Since it is not an essential Sn removal technique but a dilution method using combined hot water, a separate melting furnace capable of simultaneous tapping is required, which is economically inferior in terms of equipment cost, operation cost and cost. .
【００１２】また、二次燃焼率および排ガスの発熱量な
どは考慮外である。Further, the secondary combustion rate and the calorific value of the exhaust gas are out of consideration.
【００１３】Ｂ法：主として嵩密度の高いぶりき缶プレ
ス屑を用い、二次燃焼率を50％以上に限定する方法であ
るため、排ガスの発熱量が低下して経済的価値が小さく
なる傾向がある。Method B: This method mainly uses tin can press waste having a high bulk density and limits the secondary combustion rate to 50% or more. Therefore, the calorific value of exhaust gas is reduced and the economic value tends to be reduced. There is.
【００１４】本発明は、上記課題、特に筒型炉を用いて
嵩密度の低いSnめっき鋼板スクラップを含む原料を溶解
する場合における経済性上の問題を解決するためになさ
れたものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, particularly, the problem of economical efficiency in the case of melting a raw material including a scrap of Sn-plated steel sheet having a low bulk density using a cylindrical furnace.
【００１５】本発明の目的は、二次燃焼率の制御による
排ガス発熱量の向上ならびに高脱Sn率を達成することが
できるSnめっき鋼板スクラップの溶解方法を提供するこ
とにある。An object of the present invention is to provide a method for dissolving scrap of a Sn-plated steel sheet which can improve the calorific value of exhaust gas by controlling the secondary combustion rate and achieve a high Sn removal rate.
【００１６】[0016]
【課題を解決するための手段】本発明は、次のSnめっき
鋼板スクラップの溶解方法を要旨とする。SUMMARY OF THE INVENTION The gist of the present invention is the following method for melting a Sn-plated steel sheet scrap.
【００１７】炉上部に原料装入用と排ガス回収用の開口
部を、炉底部および／または下部炉壁に一次羽口を、上
部炉壁に二次羽口をそれぞれ備えた筒型炉を用い、その
炉底から一次羽口を含むレベルまでコークス充填層を、
その上部に二次羽口を含むレベルまでスクラップを主体
とする充填層をそれぞれ形成させた後、一次羽口から支
燃性ガスまたは支燃性ガスと燃料とを、二次羽口から支
燃性ガスをそれぞれ吹き込むスクラップの溶解方法であ
って、スクラップの少なくとも一部としてルーズパッキ
ングの錫めっき鋼板スクラップを用い、二次羽口から吹
き込む支燃性ガス量を調整して、二次燃焼率を制御しな
がら溶解することを特徴とする錫めっき鋼板スクラップ
の溶解方法。A cylindrical furnace having an opening for charging raw materials and collecting exhaust gas at an upper part of the furnace, a primary tuyere at a furnace bottom and / or a lower furnace wall, and a secondary tuyere at an upper furnace wall is used. A coke packed bed from the furnace bottom to the level including the primary tuyere,
After forming a filling layer mainly composed of scrap up to the level including the secondary tuyere, a combustion supporting gas or a combustion supporting gas and fuel are supplied from the primary tuyere, and fuel is supplied from the secondary tuyere. It is a method of dissolving scrap that blows each reactive gas, using a tin-plated steel scrap of loose packing as at least a part of the scrap, adjusting the amount of the supporting gas blown from the secondary tuyere, to reduce the secondary combustion rate A method for dissolving scrap of a tin-plated steel sheet, characterized by melting while controlling.
【００１８】上記のコークス充填層は、コークスおよび
所要の造滓剤からなるものである。The above-mentioned coke packed layer is composed of coke and a required slag-making agent.
【００１９】上記の「ルーズパッキングの錫めっき鋼板
スクラップ」とは、Snめっき鋼板製のぶりき缶を「コ」
字型、「Ｌ」字型、「Ｖ」字型または「Ｗ」字型に変形
させたもの（以下、コの字型変形屑という）、および／
またはシュレッダーしたもの（以下、シュレッダー屑と
いう）の集合体（以下、ルーズパッキング屑という）を
指す。The above-mentioned "slack-packed tin-plated steel sheet scrap" refers to a tin can made of Sn-plated steel sheet.
A shape deformed into a U-shaped, “L” -shaped, “V” -shaped or “W” -shaped (hereinafter referred to as U-shaped deformed waste), and / or
Alternatively, it refers to an aggregate of shredded materials (hereinafter, referred to as shredder waste) (hereinafter, referred to as loose packing waste).
【００２０】上記の二次燃焼率とは、下記の (a)式で定
義されるものである。The secondary combustion rate is defined by the following equation (a).
【００２１】 二次燃焼率（％） ＝(CO2体積％) ／｛(CO2体積％) ＋ (CO体積％) ｝×100 ・・ (a) ただし、(CO2体積％) および (CO体積％) は、いずれも
炉の開口部における排ガス組成を示す。Secondary combustion rate (%) = (CO 2 volume%) / ｛(CO 2 volume%) + (CO volume%)｝ × 100 (a) where (CO 2 volume%) and (CO 2 volume%) (% By volume) indicates the composition of the exhaust gas at the opening of the furnace.
【００２２】二次燃焼率の望ましい範囲は１０〜５５％
程度、さらに望ましいのは１０〜５０％未満である。The desirable range of the secondary combustion rate is 10 to 55%.
Degree, more preferably less than 10-50%.
【００２３】[0023]
【発明の実施の形態】図１に基づいて本発明方法を実施
するための炉の構成例を説明する。図１は、筒型炉とそ
の炉内装入物の状態を示す概略の縦断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A configuration example of a furnace for carrying out the method of the present invention will be described with reference to FIG. FIG. 1 is a schematic longitudinal sectional view showing the state of a cylindrical furnace and its furnace interior contents.
【００２４】筒型炉１は、その炉上部にダストを含有す
る排ガス11の回収および原料の装入を行うための開口部
２を有する。この開口部２の上方には、集塵装置、ガス
およびその熱回収設備等に接続する着脱可能なダクトが
設置されるが、それらは周知の構造のものでよいので、
図示は省略してある。The cylindrical furnace 1 has an opening 2 in the upper part of the furnace for recovering the exhaust gas 11 containing dust and charging the raw material. Above the opening 2, detachable ducts connected to a dust collector, a gas and its heat recovery equipment and the like are installed, but since they may have a known structure,
The illustration is omitted.
【００２５】筒型炉１の下部炉壁には、O2含有ガスなど
の支燃性ガスと、必要に応じてさらに微粉炭、重油、天
然ガスなどの液体または気体の燃料とを吹き込む一次羽
口３を備えている。同じく上部炉壁には、支燃性ガスを
吹き込む二次羽口４を備えている。図１の例ではさら
に、炉底に支燃性ガスやCaO などの脱硫剤を吹き込むた
めの炉底一次羽口５が設けられているが、これは必須の
一次羽口ではない。すなわち、一次羽口は下部炉壁およ
び／または炉底に設ける。一次羽口を炉底のみに設ける
場合には、この炉底一次羽口５が支燃性ガスまたは支燃
性ガスと燃料とを吹き込むものとなる。一次羽口を炉底
のみまたは下部炉壁のみとする場合、いずれも、CaO な
どの脱硫剤を吹き込むことは許容される。炉底には溶銑
９およびスラグ10を排出するための排出口６がある。The lower furnace wall of the cylindrical furnace 1 has primary blades for blowing a combustible gas such as an O 2 -containing gas and, if necessary, a liquid or gaseous fuel such as pulverized coal, heavy oil or natural gas. It has a mouth 3. Similarly, the upper furnace wall is provided with a secondary tuyere 4 for injecting a combustible gas. In the example of FIG. 1, a furnace bottom primary tuyere 5 for blowing a desulfurizing agent such as a combustible gas or CaO into the furnace bottom is provided, but this is not an essential primary tuyere. That is, the primary tuyere is provided on the lower furnace wall and / or the furnace bottom. When the primary tuyere is provided only at the furnace bottom, the furnace bottom primary tuyere 5 blows the combustible gas or the combustible gas and the fuel. When the primary tuyere is only the furnace bottom or only the lower furnace wall, it is permissible to inject a desulfurizing agent such as CaO. The furnace bottom has a discharge port 6 for discharging hot metal 9 and slag 10.
【００２６】望ましい羽口配置は次のとおりである。The preferred tuyere arrangement is as follows.
【００２７】一次羽口は、下部炉壁では炉底から0.8m程
度上部に４本（水平方向で90°間隔）、炉底では排出口
６の両側に各１本の計２本である。二次羽口は、炉底か
ら1.4m程度上部に４本（水平方向で90°間隔）である。In the lower furnace wall, there are four primary tuyeres at a height of about 0.8 m above the furnace bottom (at 90 ° intervals in the horizontal direction), and at the furnace bottom, one on each side of the discharge port 6 in total. The number of secondary tuyeres is about 1.4 m above the furnace bottom (90 ° intervals in the horizontal direction).
【００２８】上記の筒型炉１を用いてSnめっき鋼板スク
ラップを含む原料を溶解するには、図１に示すようにま
ず、コークスおよび所要の珪石、石灰石、蛇紋岩、蛍石
などの造滓剤を下部炉壁の一次羽口３を含むレベルまで
装入して、コークス充填層７を形成する。望ましいコー
クスと造滓剤との容積比の範囲は0.01〜0.3 程度、コー
クス充填層７の望ましい嵩密度の範囲は 0.8〜1.0 t/m3
（平均0.9 t/m3）程度である。コークス充填層７の望ま
しい厚さの範囲は 100〜300 mm程度である。In order to dissolve the raw material including the Sn-plated steel sheet scrap using the above-mentioned tubular furnace 1, first, as shown in FIG. 1, coke and the required slag-forming material such as quartzite, limestone, serpentine, fluorite, etc. The agent is charged to a level including the primary tuyere 3 of the lower furnace wall to form a coke packed bed 7. Desirable volume ratio of coke to slag-making agent is about 0.01 to 0.3, and preferable range of bulk density of coke packed bed 7 is 0.8 to 1.0 t / m 3.
(Average 0.9 t / m 3 ). A desirable range of the thickness of the coke packed layer 7 is about 100 to 300 mm.
【００２９】次に、Snめっき鋼板スクラップ８-1を単独
でまたは自家発生屑などの低不純物クラップ８-2ととも
に、必要に応じて鉄鉱石等の鉄源を装入して、コークス
充填層７の上部の筒型炉１の少なくとも二次羽口４を含
むレベルまでスクラップ充填層８を形成する。Next, the Sn-coated steel sheet scrap 8-1 alone or together with low-impurity scrap 8-2 such as self-generated scrap is charged with an iron source such as iron ore, if necessary, and the coke packed layer 7 is removed. The scrap filling layer 8 is formed up to a level including at least the secondary tuyere 4 of the cylindrical furnace 1 above.
【００３０】本発明方法ではこのとき、スクラップ充填
層８内の空隙を確保してこの層内においてガスとSnめっ
き鋼板スクラップとの接触を向上させるために、スクラ
ップの少なくとも一部としてルーズパッキング屑を用い
る。At this time, in the method of the present invention, in order to secure a void in the scrap filling layer 8 and to improve the contact between the gas and the scrap of the Sn-plated steel sheet in this layer, loose packing debris is used as at least a part of the scrap. Used.
【００３１】ルーズパッキング屑は前述のように、ぶり
き缶をプレス成形して複数枚束ねた形状の従来のぶりき
缶プレス屑ではなく、「コの字型変形屑」および／また
は「シュレッダー屑」の単なる集合体である。As described above, the loose packing dust is not a conventional tin can pressed into a shape in which a plurality of tinned tins are formed by pressing, but “U-shaped deformed dust” and / or “shredder dust”. Is simply an aggregate of
【００３２】「コの字型変形屑」は、ぶりき缶を個々に
ダイスを用いて「コ」の字型または「Ｌ」の字型等に変
形させたものの単なる集合体である。「シュレッダー
屑」は、ぶりき缶をシュレッダーマシンにかけて破砕し
たものの単なる集合体である。The “U-shaped deformed waste” is a mere aggregate of tin cans individually deformed into a “U” shape or an “L” shape using a dice. "Shredder waste" is simply an aggregate of crushed tin cans that have been crushed by a shredder machine.
【００３３】上記３種類の屑の嵩密度の範囲は、ブリキ
缶プレス屑では 3.0〜2.6t/m3(平均2.8t/m3)であるが、
「コの字型変形屑」では 1.4〜1.0t/m3(平均1.2t/m3)に
約60％小さくなる。「シュレッダー屑」では 1.6〜1.0t
/m3(平均1.3t/m3)である。The range of bulk density of the three types of debris, in the tin can press scrap is 3.0~2.6t / m 3 (average 2.8t / m 3),
About 60% in the "U-shaped deformed scrap" in 1.4~1.0t / m 3 (average 1.2 t / m 3) becomes smaller. 1.6-1.0t for "shredder waste"
/ m 3 (1.3 t / m 3 on average).
【００３４】このようなルーズパッキング屑および他の
自家発生の低不純物鉄スクラップなどの原料を用いて、
スクラップ充填層８の嵩密度の範囲が 1.0〜2.6t/m3(平
均1.8t/m3)程度になるように充填する。このとき、ルー
ズパッキング屑の内の「コの字型変形屑」と「シュレッ
ダー屑」との比率は任意である。また、スクラップ充填
層８の嵩密度を上記範囲とすることができる場合には、
前述のようにスクラップ全量をルーズパッキング屑単独
とすることもできる。Using such raw materials as loose packing waste and other self-generated low-impurity iron scrap,
Range of the bulk density of the scrap packed layer 8 is filled such that 1.0~2.6t / m 3 (average 1.8 t / m 3) degree. At this time, the ratio between the “U-shaped deformed waste” and the “shredder waste” in the loose packing waste is arbitrary. When the bulk density of the scrap filling layer 8 can be set in the above range,
As described above, the entire amount of scrap can be used as loose packing waste alone.
【００３５】上記のように充填した後、コークス充填層
７に下部炉壁の一次羽口３および／または炉底一次羽口
５から支燃性ガスなどを吹き込み、下記(1) 式の部分燃
焼反応を生じさせ、高温のCOガスを発生させるととも
に、コークス充填層７を高温に保つ。After filling as described above, a combustible gas or the like is blown into the coke packed bed 7 from the primary tuyere 3 of the lower furnace wall and / or the primary tuyere 5 of the furnace bottom, and the partial combustion of the following formula (1) is performed. A reaction is caused to generate a high-temperature CO gas, and the coke packed bed 7 is kept at a high temperature.
【００３６】 Ｃ＋(1/2)O2 → CO ＋29,400 kcal/kmol・Ｃ ・・・(1) 上記 (1)式で発生したCOガスは、スクラップ充填層８内
で二次羽口４から吹き込まれる支燃性ガスと反応し、下
記 (2)式にしたがって二次燃焼を起こす。その反応熱に
より、スクラップが加熱、溶解される。C + (1/2) O 2 → CO + 29,400 kcal / kmol · C (1) The CO gas generated by the above equation (1) is supplied to the secondary tuyere 4 in the scrap filling layer 8. Reacts with the supporting gas blown from the air and generates secondary combustion according to the following equation (2). The heat of reaction heats and dissolves the scrap.
【００３７】 CO＋(1/2)O2 → CO2＋67,590 kcal/kmol・CO ・・・(2) このとき、二次羽口４から吹き込む支燃性ガスの流量を
調整して、開口部２における二次燃焼率を制御する。二
次燃焼率の望ましい範囲は１０〜５５％程度、さらに望
ましいのは１０〜５０％未満である。CO + (1/2) O 2 → CO 2 +67,590 kcal / kmol · CO (2) At this time, the flow rate of the supporting gas blown from the secondary tuyere 4 is adjusted to The secondary combustion rate in the section 2 is controlled. The desirable range of the secondary combustion rate is about 10 to 55%, more preferably less than 10 to 50%.
【００３８】二次燃焼率が５５％を超えると排ガス中の
CO比率が減少し、その発熱量が低下するので、経済性が
悪化する。５０％未満であれば排ガスの発熱量が増加
し、製鋼から圧延までの工程で必要とするエネルギーを
補うことができる。一方、二次燃焼率が１０％を下回る
と溶解効率、すなわち生産性が低下し、さらに脱Snのた
めのCO2 の発生を確保することが困難となり、脱Sn率も
低下する。When the secondary combustion rate exceeds 55%, the
Since the CO ratio decreases and the calorific value decreases, economic efficiency deteriorates. If it is less than 50%, the calorific value of the exhaust gas increases, and the energy required in the steps from steelmaking to rolling can be supplemented. On the other hand, if the secondary combustion rate is less than 10%, the dissolution efficiency, that is, the productivity, decreases, and it becomes difficult to secure the generation of CO 2 for removing Sn, and the Sn removal rate also decreases.
【００３９】このようにして、ルーズパッキング屑の表
層のSnを、SnO2ダストとして排ガスとともに炉外に排出
させて回収すると共に、Sn含有量の少ない銑鉄を製造す
る。In this manner, Sn in the surface layer of the loose packing debris is discharged as SnO 2 dust out of the furnace together with the exhaust gas and recovered, and pig iron with a small Sn content is produced.
【００４０】さらに、同時にCO比率の高い高発熱量の排
ガスを回収して燃料として活用する。Further, at the same time, high calorific value exhaust gas having a high CO ratio is recovered and used as fuel.
【００４１】本発明方法の基本的な技術思想は、炉下部
で発生させたCOガスの二次燃焼率を望ましくは前記の範
囲のように制御しながら、昇温過程初期の低温時に溶融
するルーズパッキング屑の表層のSnを（炉底へ滴下した
り、母材に拡散する前に）酸化させ、SnO2ダストとして
炉外に排出して、Sn含有量の低い銑鉄を低コストで製造
するとともに、高い発熱量をもつ排ガスを回収すること
にある。The basic technical idea of the method of the present invention is that, while controlling the secondary combustion rate of the CO gas generated in the lower part of the furnace, preferably in the above-mentioned range, the loose melting which occurs at a low temperature in the early stage of the temperature raising process. The Sn on the surface layer of packing debris is oxidized (before dripping into the furnace bottom or diffusing into the base material) and discharged out of the furnace as SnO 2 dust to produce pig iron with low Sn content at low cost Another object of the present invention is to recover an exhaust gas having a high calorific value.
【００４２】本発明方法における脱Sn機構は、次のよう
に考えられる。The mechanism for removing Sn in the method of the present invention is considered as follows.
【００４３】1. 前記 (1)式で発生した高温のCOガス
は、コークス充填層内を上昇し、スクラップ充填層内に
おいて二次燃焼 (前記 (2)式による) されて、1700〜19
00℃の二次燃焼ガスを生成する。1. The high-temperature CO gas generated in the above formula (1) rises in the coke packed bed, and is subjected to secondary combustion (according to the above formula (2)) in the scrap packed bed, thereby causing 1700-19
Generates a secondary combustion gas at 00 ° C.
【００４４】2. 二次燃焼ガスは、ルーズパッキング屑
の相互間の空隙を通過してルーズパッキング屑を表面か
ら内部にかけて急速に加熱し、ガス温度自体は降下しな
がらスクラップ充填層内を上昇する。そして、連続的に
装入される次回溶解用のコークス充填層およびスクラッ
プ充填層と熱交換して、排ガス温度 200〜500 ℃で開口
部から排出される。2. The secondary combustion gas passes through the gap between the loose packing debris and rapidly heats the loose packing debris from the surface to the inside, and the gas temperature itself rises in the scrap packed bed while decreasing. . Then, heat is exchanged with the coke packed bed and the scrap packed bed for the next melting which are continuously charged, and the gas is discharged from the opening at an exhaust gas temperature of 200 to 500 ° C.
【００４５】3. 冷材として炉内に装入されたルーズパ
ッキング屑は、スクラップ充填層内の存在位置によって
昇温速度が異なるが、その表面から急速に昇温を開始す
る。そして、ルーズパッキング屑の表面層温度が 232℃
(Snの融点) に達すると、Snめっき層 (通常、厚さ40×
10-6m 程度) は直ちに溶融し、ルーズパッキング屑内を
通過する二次燃焼ガス中の CO2ガスによって酸化され
て、固相のSnO2薄層がめっき層と母材の接合面から剥離
した状態で形成される。従って、昇温初期に溶融したSn
が充填層内を滴下して炉底に溜まったり、母材中にSnが
拡散したりして、製造溶銑中にSnが濃縮されるようなこ
とはなくなる。3. The temperature of the loose packing debris charged into the furnace as a cold material varies depending on the position in the scrap packing layer, but the temperature of the loose packing debris starts rapidly from its surface. And the surface layer temperature of loose packing waste is 232 ℃
(Sn melting point), the Sn plating layer (normally thickness 40 ×
(About 10 -6 m) immediately melts and is oxidized by the CO 2 gas in the secondary combustion gas passing through the loose packing debris, and the solid SnO 2 thin layer peels off from the joint surface between the plating layer and the base metal It is formed in a state where it is formed. Therefore, the molten Sn
Does not drop in the packed bed and accumulate at the furnace bottom, or Sn diffuses into the base metal, so that Sn is not concentrated in the produced hot metal.
【００４６】4. 母材から剥離した固相のSnO2表面薄層
は、スクラップ充填層内の空隙を通過して上昇する前記
温度の高温の二次燃焼ガスによって加熱され、母材の昇
温に優先して昇温する。その昇温過程で微粉化した一部
のSnO2は二次燃焼ガスの上昇気流に随伴して上昇し、排
ガスダストとなって開口部から炉外に排出される。母材
表面に残存したSnO2薄層は、母材である鋼材が溶解する
前に二次燃焼ガス生成温度近くまで昇温する。SnO2は18
00℃以上で融解せずに昇華するので、スクラップ充填層
内の空隙を通過してSnO2蒸気が上昇し、上昇中に冷却さ
れて微細な排ガスダストとなって炉外に排出される。4. The solid phase SnO 2 thin layer separated from the base material is heated by the high-temperature secondary combustion gas which rises through the voids in the scrap filling layer and rises in temperature. Priority is given to heating. Part of the SnO 2 that has been pulverized during the heating process rises with the rising airflow of the secondary combustion gas, and is discharged as exhaust gas dust out of the furnace through the opening. The temperature of the SnO 2 thin layer remaining on the surface of the base material rises to near the secondary combustion gas generation temperature before the steel material as the base material is melted. SnO 2 is 18
Since it sublimes without melting at a temperature of 00 ° C. or higher, SnO 2 vapor rises through a void in the scrap packed layer, is cooled during the rise, and is discharged as fine exhaust gas dust outside the furnace.
【００４７】本発明者は、以上の脱Sn機構がスクラップ
充填層内の空隙によって影響を受けることを知見した。
すなわち、ガスとSnめっき鋼板スクラップ表面との接触
状況を良くすることが脱Snに最も必要なファクターであ
り、従来のようなCO2 が高濃度の二次燃焼ガスを発生さ
せる必要がないことを実験によって見いだした。The present inventor has found that the above Sn removal mechanism is affected by voids in the scrap filling layer.
That is the most necessary factor in the Sn removing possible to improve the state of contact between the gas and the Sn-plated iron type scrap surface, the CO 2 as in the prior art is not necessary to generate a high concentration of secondary combustion gas Found by experiment.
【００４８】図２は、脱Snフローを説明する図である。
図示するように、発生したCOガスおよびCO2 ガスは、ス
クラップの加熱、溶融、Snの酸化およびSnO2の剥離・昇
華の各段階で、Snめっき鋼板スクラップ表面と接触す
る。一部のSnO2は二次燃焼ガスの上昇気流に随伴して上
昇し、排ガスダストとなって開口部から炉外に排出され
る。FIG. 2 is a diagram for explaining the Sn removal flow.
As shown in the drawing, the generated CO gas and CO 2 gas come into contact with the scrap surface of the Sn-plated steel sheet at each stage of heating, melting, oxidizing Sn, and peeling and sublimating SnO 2 . Some SnO 2 rises with the rising airflow of the secondary combustion gas and is exhausted as exhaust gas dust from the opening to the outside of the furnace.
【００４９】すなわち、スクラップ充填層の嵩密度を適
正範囲に維持して空隙を多くし、Ｓｎめっき鋼板スクラ
ップ表面とガスとの接触面積を大きくとれば、図２に示
す脱Ｓｎフローにおける加熱、溶融、酸化および排ガス
によるSnO2の随伴上昇および排出が促進される。That is, if the bulk density of the scrap packed layer is maintained in an appropriate range to increase the voids and increase the contact area between the scrap surface of the Sn-plated steel sheet and the gas, heating and melting in the Sn removal flow shown in FIG. Accordingly, the accompanying increase and emission of SnO 2 due to oxidation and exhaust gas are promoted.
【００５０】本発明者が、溶解操業を中断して炉内のス
クラップ充填層から採取した「コの字型変形屑」を調査
した結果によれば、この屑は依然として装入前の「コの
字」または「Ｌの字」などの状態に近い凹凸状の形状を
維持し、かつ、その表面は赤褐色を呈していたので、ガ
スとの接触面積が大きかったことが実証された。According to the result of the present inventor's investigation of “U-shaped deformed debris” collected from the scrap packed bed in the furnace after the melting operation was stopped, this debris was still “U-shaped deformed debris” before charging. Since the shape of the concavo-convex shape close to a state such as "character" or "L-shape" was maintained, and the surface thereof was reddish brown, it was proved that the contact area with the gas was large.
【００５１】よって、本発明方法では、スクラップの少
なくとも一部として前述のルーズパッキング屑を用い、
上部炉壁に設けた二次羽口から吹き込む支燃性ガス量を
調整して、二次燃焼率を制御しながら溶解することとし
た。Therefore, in the method of the present invention, the above-mentioned loose packing waste is used as at least a part of the scrap,
The amount of the supporting gas blown from the secondary tuyere provided on the upper furnace wall was adjusted to melt while controlling the secondary combustion rate.
【００５２】本発明方法では、前記の機構および作用効
果に基づいて、Snめっき鋼板スクラップ表面のSnめっき
層をSnO2に形態変化させて炉外に排出し除去することが
できる。従って、脱Sn予備処理工程や合わせ湯工程を追
加せず、また高価な電力を用いずに１基の炉により、高
品位鋼の製造に使用可能なSn含有量の低い溶銑を製造し
ながら、高発熱量の排ガスを回収することができる。According to the method of the present invention, the Sn plating layer on the surface of the scrap of the Sn plating steel sheet can be changed into SnO 2 and discharged out of the furnace and removed based on the above-mentioned mechanism and operation and effect. Therefore, without adding a Sn pre-treatment step or combined hot water step, and using a single furnace without using expensive electric power, while producing hot metal with a low Sn content that can be used for the production of high-grade steel, Exhaust gas with a high calorific value can be recovered.
【００５３】[0053]
【実施例】図１に示す装置構成の筒型炉（直径1.5m、炉
底から炉口までの高さ3.6m、内容積 6.0m3）を用い、ス
クラップ配合条件および平均二次燃焼率を変化させて溶
銑の連続製造試験を実施し、脱Sn率、排ガスの発熱量及
びダスト排出量などを調査した。EXAMPLE Using a cylindrical furnace (diameter 1.5 m, height from the furnace bottom to the furnace opening 3.6 m, internal volume 6.0 m 3 ) having the apparatus configuration shown in FIG. 1, the scrap mixing conditions and the average secondary combustion rate were determined. A continuous production test of hot metal was carried out with various changes, and the Sn removal rate, the calorific value of exhaust gas, and the amount of dust emission were investigated.
【００５４】羽口位置は次のとおりとした。The tuyere positions were as follows.
【００５５】一次羽口（下部炉壁）：炉底から0.8m上部
に４本（水平方向で90°間隔） 一次羽口（炉底）：排出口の両側に各１本 二次羽口：炉底から1.4m上部に４本（水平方向で90°間
隔） これらのの二次羽口は、支燃性ガスとN2ガスとの切替え
吹き込みができるようにした。Primary tuyere (lower furnace wall): 4 pieces 0.8 m above the furnace bottom (90 ° interval in horizontal direction) Primary tuyere (furnace bottom): 1 piece on each side of discharge port Secondary tuyere: Four at 1.4 m above the furnace bottom (90 ° intervals in the horizontal direction) These secondary tuyeres were designed to be able to switch between the combustion supporting gas and the N 2 gas.
【００５６】使用した鉄源は次のとおりとした。The iron sources used were as follows.
【００５７】所内発生鋼屑 (鉄純度99％) ：最大寸法 4
00mm角、嵩比重 3.5t/m3のSnを含まないもの ルーズパッキング屑：Sn含有量が0.30％重量％の「コの
字型変形屑」および「シュレッダー屑」 ぶりき缶プレス屑：Sn含有量は0.30％重量％ 支燃性ガスはO2、コークスは粒度20〜70mmの塊状のも
の、燃料は 200メッシュ篩下が80重量％以上の微粉炭を
使用した。表１にコークスおよび微粉炭の組成、表２に
操業条件を示す。In-house generated steel scrap (iron purity 99%): Maximum dimension 4
00mm square, bulk density 3.5t / m 3 of Sn to include NOT loose packing scrap: "U-shaped deformed scrap" in Sn content of 0.30% wt% and "shredder scrap" tin cans pressing scraps: Sn content The amount was 0.30% by weight. The supporting gas was O 2 , the coke was a lump having a particle size of 20 to 70 mm, and the coal used was pulverized coal having a size of 80% by weight or more under a 200 mesh sieve. Table 1 shows the composition of coke and pulverized coal, and Table 2 shows the operating conditions.
【００５８】[0058]
【表１】 [Table 1]
【００５９】[0059]
【表２】 [Table 2]
【００６０】（実施例１）表２に示す配合条件にしたが
い、図１に示すような充填層構造の原料装入を実施した
後、平均二次燃焼率が18％になるように二次羽口からO2
を吹き込まずに、下部炉壁の一次羽口から800Nm3/Hr の
O2、炉底一次羽口から200Nm3/Hr のO2と、さらに下部炉
壁の一次羽口から150Nm3/Hr のN2で気送された1200 kg/
Hrの微粉炭とをコークス充填層に吹き込んだ。(Example 1) According to the blending conditions shown in Table 2, after charging the raw material having a packed bed structure as shown in FIG. 1, the secondary blades were adjusted so that the average secondary combustion rate became 18%. O 2 by mouth
Of 800Nm 3 / Hr from the primary tuyere of the lower furnace wall without blowing
O 2 , 200 Nm 3 / Hr O 2 from the bottom tuyere primary tuyere and 1200 kg / pneumatically pumped from the lower tuyere primary tuyere with 150 Nm 3 / Hr N 2
Hr pulverized coal was blown into the coke packed bed.
【００６１】このとき、二次羽口の閉塞を防止するため
に、表２に示すように二次羽口から最少量のN2ガスをを
吹き込んだ。At this time, a minimum amount of N 2 gas was blown from the secondary tuyere as shown in Table 2 in order to prevent the secondary tuyere from being blocked.
【００６２】溶解が進行してスクラップ充填層高が低く
なると、次回連続溶解用のコークス、スクラップを装入
して充填層を形成した。このようにして、１回の出銑量
7.5トンの溶銑を連続的に製造した。When the melting progressed and the height of the scrap packed layer was lowered, coke and scrap for the next continuous melting were charged to form a packed layer. In this way, the output of one tap
7.5 tons of hot metal was produced continuously.
【００６３】（実施例２）表２に示す配合条件にしたが
い、図１に示すような充填層構造の原料装入を実施した
後、一次羽口の吹き込み条件は実施例１と同じとし、平
均二次燃焼率が41％または40％になるように二次羽口か
ら400Nm3/Hr のO2をコークス充填層に吹き込んだ。(Example 2) According to the mixing conditions shown in Table 2, after charging the raw material having a packed bed structure as shown in FIG. 1, the primary tuyere blowing conditions were the same as in Example 1, and the average 400 Nm 3 / Hr O 2 was blown into the coke packed bed from the secondary tuyere so that the secondary combustion rate became 41% or 40%.
【００６４】溶解が進行してスクラップ充填層高が低く
なると、次回連続溶解用のコークス、スクラップを装入
して充填層を形成した。このとき、二次羽口の前面には
コークスが存在し、スクラップは存在しないので、表２
に示すようにO2吹き込みを最少量のN2ガ吹き込みに切り
替えた。このようにして、１回の出銑量 7.5トンの溶銑
を連続的に製造した。When the melting progressed and the height of the scrap packed layer was lowered, coke and scrap for the next continuous melting were charged to form a packed layer. At this time, coke was present in front of the secondary tuyere and no scrap was present.
As shown in the above, the O 2 blowing was switched to the minimum amount of N 2 gas blowing. In this way, hot metal with a tapping capacity of 7.5 tons per production was produced continuously.
【００６５】（実施例３）表２に示す配合条件にしたが
い、図１に示すような充填層構造の原料装入を実施した
後、一次羽口の吹き込み条件は実施例１および２と同じ
とし、平均二次燃焼率が55％または53％になるように二
次羽口から 550Nm3/HrのO2をコークス充填層に吹き込ん
だ。Example 3 According to the blending conditions shown in Table 2, after the raw materials having the packed bed structure shown in FIG. 1 were charged, the blowing conditions of the primary tuyere were the same as in Examples 1 and 2. Then, 550 Nm 3 / Hr O 2 was blown into the coke packed bed from the secondary tuyere so that the average secondary combustion rate was 55% or 53%.
【００６６】溶解が進行してスクラップ充填層高が低く
なると、次回連続溶解用のコークスおよびスクラップを
装入して充填層を形成した。このとき、二次羽口の前面
にコークスが存在し、スクラップが存在しないので、表
２に示すようにO2吹き込みを最少量のN2ガス吹き込みに
切り替えて溶解を完了させた。このようにして、１回の
出銑量 7.5トンの溶銑を連続的に製造した。When the melting progressed and the height of the scrap packed layer was lowered, coke and scrap for the next continuous melting were charged to form a packed layer. At this time, since coke was present in front of the secondary tuyere and no scrap was present, as shown in Table 2, O 2 blowing was switched to a minimum amount of N 2 gas blowing to complete the melting. In this way, hot metal with a tapping capacity of 7.5 tons per production was produced continuously.
【００６７】（比較例１）表２に示す配合条件にしたが
い、その他の条件は実施例１と略々同一とした。(Comparative Example 1) Other conditions were substantially the same as Example 1 according to the blending conditions shown in Table 2.
【００６８】（比較例２）表２に示す配合条件にしたが
い、その他の条件は比較例１と略々同一とした。(Comparative Example 2) According to the blending conditions shown in Table 2, other conditions were substantially the same as those of Comparative Example 1.
【００６９】表３に上記試験結果を示す。Table 3 shows the test results.
【００７０】[0070]
【表３】 [Table 3]
【００７１】表３に示す脱Sn率は、装入鉄源中の計算Sn
重量（装入Sn重量）および表３に示す製造溶銑中のSn含
有率と出銑量とから計算した製造溶銑中のSn重量を用い
て、表３の下（注）に示す式により求めた値である。The Sn removal ratio shown in Table 3 is calculated Sn in the charged iron source.
Using the weight (the charged Sn weight) and the Sn weight in the manufactured hot metal calculated from the Sn content in the manufactured hot metal and the tapping amount shown in Table 3, it was determined by the formula shown in the lower (note) of Table 3. Value.
【００７２】表３に示すように脱Sn率は、実施例１では
72％または70％、実施例２では81％または80％、実施例
３では85％または81％に達し、比較例１の場合の53％に
比べて約20〜30％向上した。As shown in Table 3, the Sn removal rate was as follows in Example 1.
It reached 72% or 70%, 81% or 80% in Example 2, and 85% or 81% in Example 3, which was about 20 to 30% higher than 53% in Comparative Example 1.
【００７３】実施例１では脱Sn率が高く、しかも排ガス
発熱量は、二次燃焼率が略々同じである比較例１の場合
と比べて大差のない高い発熱量となった。また実施例１
では、脱Sn率は比較例２と比べて略々同等であるが、排
ガス発熱量は約1.8 倍近く高くなった。実施例２の場
合、比較例２と比べて脱Sn率は高く、かつ二次燃焼率が
約40％であるため、排ガス発熱量も高くなった。実施例
３の場合、脱Sn率は高いが、二次燃焼率が50％を超えて
いるため、排ガス発熱量は比較例１よりも低下した。し
かし、排ガス発熱量は比較例２と略々同等となった。In Example 1, the Sn removal rate was high, and the calorific value of the exhaust gas was a large calorific value that was not much different from that of Comparative Example 1 in which the secondary combustion rate was substantially the same. Example 1
In this case, the Sn removal rate was substantially the same as in Comparative Example 2, but the calorific value of the exhaust gas was increased by about 1.8 times. In the case of Example 2, since the Sn removal rate was higher and the secondary combustion rate was about 40% as compared with Comparative Example 2, the calorific value of the exhaust gas was also higher. In the case of Example 3, although the Sn removal rate was high, since the secondary combustion rate exceeded 50%, the calorific value of the exhaust gas was lower than that of Comparative Example 1. However, the calorific value of the exhaust gas was substantially equal to that of Comparative Example 2.
【００７４】比較例１では、排ガス発熱量を高くするこ
とはできたが、脱Sn率を高くすることはできなかった。
比較例２では、脱Sn率を高くすることはできたが、排ガ
ス発熱量を高くすることはできなかった。In Comparative Example 1, although the calorific value of the exhaust gas could be increased, the Sn removal rate could not be increased.
In Comparative Example 2, although the Sn removal rate could be increased, the calorific value of the exhaust gas could not be increased.
【００７５】このように、本発明方法は脱Sn率が同一の
条件では高発熱量の排ガスを回収することができるもの
であり、経済的優位性を持っていることが明らかであ
る。As described above, the method of the present invention can recover a high calorific value of exhaust gas under the same Sn removal ratio, and it is clear that the method has an economic advantage.
【００７６】[0076]
【発明の効果】本発明方法によれば、脱Sn予備処理工程
や合わせ湯工程を追加せず、また高価な電力を用いずに
１基の炉により、高品位鋼の製造に使用可能なSn含有量
の低い溶銑を製造しながら、高発熱量の排ガスを回収す
ることができる。また、SnO2が濃縮された排ガスダスト
はSn源として有効に利用することができる。According to the method of the present invention, the Sn which can be used for the production of high-grade steel can be produced by a single furnace without adding a pretreatment step for removing Sn or a step of mixing hot water, and without using expensive electric power. It is possible to collect exhaust gas having a high calorific value while producing hot metal with a low content. Further, the exhaust gas dust in which SnO 2 is concentrated can be effectively used as a Sn source.
【図１】本発明方法の実施に用いる筒型炉とその炉内装
入物状態を示す概略の縦断面図である。FIG. 1 is a schematic longitudinal sectional view showing a cylindrical furnace used for carrying out the method of the present invention and a state in which the furnace interior is charged.
【図２】脱Snフローを説明する図である。FIG. 2 is a diagram for explaining a Sn removal flow.
１：筒型炉、 ２：開口部、３：下部炉壁一次
羽口、４：二次羽口、５：炉底一次羽口、 ６：排出
口、７：コークス充填層、 ８：スクラップ充填層、
９：溶銑、 10：スラグ、11：排ガス1: cylindrical furnace, 2: opening, 3: lower furnace wall primary tuyere, 4: secondary tuyere, 5: furnace bottom primary tuyere, 6: discharge port, 7: coke packed bed, 8: scrap filling layer,
9: Hot metal, 10: Slag, 11: Exhaust gas
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−207313（ＪＰ，Ａ) 特開 平２−38506（ＪＰ，Ａ) 特開 平６−264125（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21B 11/00 - 13/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-207313 (JP, A) JP-A-2-38506 (JP, A) JP-A-6-264125 (JP, A) (58) Field (Int. Cl. 7 , DB name) C21B 11/00-13/00
Claims (1)
部を、炉底部および／または下部炉壁に一次羽口を、上
部炉壁に二次羽口をそれぞれ備えた筒型炉を用い、その
炉底から一次羽口を含むレベルまでコークス充填層を、
その上部に二次羽口を含むレベルまでスクラップを主体
とする充填層をそれぞれ形成させた後、一次羽口から支
燃性ガスまたは支燃性ガスと燃料とを、二次羽口から支
燃性ガスをそれぞれ吹き込むスクラップの溶解方法であ
って、スクラップの少なくとも一部としてルーズパッキ
ングの錫めっき鋼板スクラップを用い、二次羽口から吹
き込む支燃性ガス量を調整して、二次燃焼率を制御しな
がら溶解することを特徴とする錫めっき鋼板スクラップ
の溶解方法。A cylindrical furnace having an opening for charging raw materials and collecting exhaust gas at an upper part of a furnace, a primary tuyere at a furnace bottom and / or a lower furnace wall, and a secondary tuyere at an upper furnace wall. Using the coke packed bed from the furnace bottom to the level including the primary tuyere,
After forming a filling layer mainly composed of scrap up to the level including the secondary tuyere, a combustion supporting gas or a combustion supporting gas and fuel are supplied from the primary tuyere, and fuel is supplied from the secondary tuyere. It is a method of dissolving scrap that blows each reactive gas, using a tin-plated steel scrap of loose packing as at least a part of the scrap, adjusting the amount of the supporting gas blown from the secondary tuyere, to reduce the secondary combustion rate A method for dissolving scrap of a tin-plated steel sheet, characterized by melting while controlling.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24926595A JP2998610B2 (en) | 1995-09-27 | 1995-09-27 | Dissolution method of tin plated steel sheet scrap |
| DE1996617198 DE69617198T2 (en) | 1995-09-27 | 1996-09-27 | METHOD FOR MELTING TINNED STEEL SCRAP |
| EP96932044A EP0792939B1 (en) | 1995-09-27 | 1996-09-27 | Method of melting tinned iron scrap |
| PCT/JP1996/002835 WO1997012065A1 (en) | 1995-09-27 | 1996-09-27 | Method of melting tinned iron scrap |
| KR1019970703415A KR100250672B1 (en) | 1995-09-27 | 1996-09-27 | Method of melting tinned iron scrap |
| US08/849,039 US5902375A (en) | 1995-09-27 | 1996-09-27 | Method of melting tinned iron scrap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24926595A JP2998610B2 (en) | 1995-09-27 | 1995-09-27 | Dissolution method of tin plated steel sheet scrap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0987718A JPH0987718A (en) | 1997-03-31 |
| JP2998610B2 true JP2998610B2 (en) | 2000-01-11 |
Family
ID=17190398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24926595A Expired - Lifetime JP2998610B2 (en) | 1995-09-27 | 1995-09-27 | Dissolution method of tin plated steel sheet scrap |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2998610B2 (en) |
-
1995
- 1995-09-27 JP JP24926595A patent/JP2998610B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0987718A (en) | 1997-03-31 |
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