JPH0699736B2 - Method for adding heat to molten metal in refining or smelting and steelmaking furnace therefor - Google Patents
Method for adding heat to molten metal in refining or smelting and steelmaking furnace thereforInfo
- Publication number
- JPH0699736B2 JPH0699736B2 JP60226945A JP22694585A JPH0699736B2 JP H0699736 B2 JPH0699736 B2 JP H0699736B2 JP 60226945 A JP60226945 A JP 60226945A JP 22694585 A JP22694585 A JP 22694585A JP H0699736 B2 JPH0699736 B2 JP H0699736B2
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- molten metal
- slag layer
- respect
- range
- 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
- 229910052751 metal Inorganic materials 0.000 title claims description 29
- 239000002184 metal Substances 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 18
- 238000003723 Smelting Methods 0.000 title claims description 11
- 238000009628 steelmaking Methods 0.000 title claims description 6
- 238000007670 refining Methods 0.000 title claims description 4
- 239000002893 slag Substances 0.000 claims description 31
- 238000002485 combustion reaction Methods 0.000 claims description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 20
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 20
- 238000007664 blowing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 17
- 229910052760 oxygen Inorganic materials 0.000 description 17
- 239000001301 oxygen Substances 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 238000006722 reduction reaction Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、精錬または製錬での溶湯への熱付加方法お
よびその製鋼炉に関する。TECHNICAL FIELD The present invention relates to a method for adding heat to molten metal in refining or smelting and a steelmaking furnace therefor.
転炉製鋼法において底吹転炉法は、上吹転炉法に比較し
て、溶湯の激しい撹拌により溶湯の過酸化の抑制（スラ
グ中のFeの減少）、良好なスラグ−メタル反応（例えば
脱リン脱硫）、スロッピングおよびスピテイングの減少
という種々の利点がある。しかし上吹転炉法も吹錬酸素
供給速度の柔軟性、スラグ生成制御の柔軟性、スクラッ
プ消費量の増加、炉底耐火物の安定性等の点で優れてお
り、両者の利点を組合わせた複金吹錬法が開発されてい
る。In the converter steelmaking method, the bottom-blowing converter method, compared with the top-blowing converter method, suppresses the peroxidation of the molten metal by vigorous stirring of the molten metal (reduction of Fe in the slag), and a good slag-metal reaction (for example, Dephosphorization, desulphurization), sloping and reduced spitting have various advantages. However, the top blowing converter method is also excellent in terms of flexibility of blowing oxygen supply rate, flexibility of slag generation control, increase of scrap consumption, stability of furnace bottom refractories, etc. A compound gold blowing method has been developed.
ところで、これら各転炉法による製錬では、脱炭反応
（Ｃ＋1/2O2→CO）の促進、および一酸化炭素の燃焼反
応（CO＋1/2O2→CO2）による燃焼熱の利用のため、二次
燃焼用酸素吐出孔を有するランスが一般に設けられてい
る。そのランス構造は脱炭反応用の酸素吐出孔がランス
の先端に開口しており一酸化炭素の燃焼反応用の酸素吐
出孔は通常同じランスの先端或いは、ランス側壁に複数
個開口されている。そして、二次燃焼用酸素吐出孔はそ
の機能上、通常スラグ層の上に酸素吐出孔が位置するよ
うに配設されている。By the way, in smelting by each of these converter methods, in order to promote the decarburization reaction (C + 1 / 2O 2 → CO) and to utilize the combustion heat from the combustion reaction of carbon monoxide (CO + 1 / 2O 2 → CO 2 ), A lance having an oxygen discharge hole for secondary combustion is generally provided. In the lance structure, an oxygen discharge hole for a decarburization reaction is opened at the tip of the lance, and a plurality of oxygen discharge holes for a carbon monoxide combustion reaction are usually opened at the tip of the same lance or a side wall of the lance. The oxygen discharge holes for secondary combustion are usually arranged so that the oxygen discharge holes are located above the slag layer in terms of their functions.
また、特公昭53−35764号公報記載の発明では、炉壁に
二次燃焼用羽口を設けており、転炉のスラグ層の上方に
存在する一酸化炭素層の位置の炉壁に前後および水平方
向に変位可能な羽口を設け、検出した一酸化炭素の量に
応じて羽口を変位させて、酸素を吹込んで一酸化炭素を
燃焼させている。Further, in the invention described in JP-B-53-35764, the tuyeres for secondary combustion are provided in the furnace wall, and the front and rear and front and rear walls of the furnace at the position of the carbon monoxide layer existing above the slag layer of the converter. A tuyere that can be displaced in the horizontal direction is provided, and the tuyere is displaced according to the detected amount of carbon monoxide, and oxygen is blown in to burn carbon monoxide.
ところで、従来技術のうち、二次燃焼用ランスによる一
酸化炭素の燃焼は、二次燃焼用酸素吐出口孔の先端部分
で燃焼反応が起きるから、エネルギー価値の高い一酸化
炭素の燃焼率は低く、しかも部分的に発生した高熱も炉
内で輻射による伝熱は少ないから、有効利用できない。By the way, among the conventional techniques, in the combustion of carbon monoxide by the secondary combustion lance, a combustion reaction occurs at the tip of the secondary combustion oxygen discharge port, so the combustion rate of carbon monoxide with high energy value is low. Moreover, even high heat generated partially cannot be effectively used because heat transfer by radiation is small in the furnace.
また、特公昭53−35764号公報記載の発明も、発生する
一酸化炭素の量に応じて燃焼反応をコントロールするこ
とができる点で優れているが、発生した高熱と溶湯への
間にスラグ層が介在し、しかもそのスラグ層はガスを含
んでいるので、一酸化炭素の燃焼による高熱の溶湯への
着熱は全んど期待できない。The invention described in JP-B-53-35764 is also excellent in that the combustion reaction can be controlled according to the amount of carbon monoxide generated, but a slag layer is formed between the high heat generated and the molten metal. However, since the slag layer contains gas, the heat of the high-temperature molten metal due to the combustion of carbon monoxide cannot be expected at all.
上記のような従来の転炉による製錬での二次燃焼では、
一酸化炭素の燃焼による高熱が溶湯へ着熱せず、そのた
めエネルギー価値の高い一酸化炭素の有効利用が図れ
ず、製錬過程での溶湯への熱付加効率が低いという問題
があった。In the secondary combustion in the smelting by the conventional converter as described above,
There was a problem that the high heat generated by the combustion of carbon monoxide did not reach the molten metal, so that carbon monoxide having a high energy value could not be effectively utilized, and the efficiency of heat addition to the molten metal during the smelting process was low.
この発明に係る溶湯への熱付加方法は、精錬または製錬
において、スラグ層で一酸化炭素を燃焼させて発生する
高温の燃焼熱を、スラグ層を撹拌循環させることにより
溶湯へ高効率に伝熱するものである。The method for adding heat to the molten metal according to the present invention efficiently transfers the high-temperature combustion heat generated by burning carbon monoxide in the slag layer during refining or smelting to the molten metal by stirring and circulating the slag layer. It heats up.
またこの発明の別の発明に係る製鋼炉は、炉芯に対して
点対称で、かつスラグ層の範囲に相当する炉壁に上向き
と下向きとからなる羽口を少なくとも２カ所以上設け、
しかも上向きの羽口の水平方向に対する傾斜角θは０゜
＜θ≦60゜の範囲で、下向きの羽口の水平方向に対する
傾斜角θは−60≦θ＜０゜の範囲にあるようにしたもの
である。Further, a steelmaking furnace according to another invention of the present invention is provided with at least two tuyeres that are point-symmetric with respect to the furnace core and that are upward and downward on the furnace wall corresponding to the range of the slag layer,
Moreover, the inclination angle θ of the upward tuyere with respect to the horizontal direction is in the range of 0 ° <θ ≦ 60 °, and the inclination angle θ of the downward tuyere with respect to the horizontal direction is in the range of −60 ≦ θ <0 °. It is a thing.
この発明においては、撹拌循環しているスラグ層で一酸
化炭素の燃焼反応が行われるから、燃焼反応の効率が高
くなり、かつ高温の燃焼熱も循環して、遷移状態にある
スラグ層と溶湯との界面から溶湯へ伝熱される。In the present invention, since the combustion reaction of carbon monoxide is carried out in the slag layer which is being circulated by stirring, the efficiency of the combustion reaction is increased, and the high temperature combustion heat is also circulated, whereby the slag layer and the molten metal in the transition state Heat is transferred from the interface to the molten metal.
またこの発明の別の発明においては、炉壁のスラグ層の
位置に所定の角度に傾斜した下向きと上向きの羽口が炉
芯に対して点対称に設けられているから、羽口から酸化
性ガスを吹込むことによりスラグ層を撹拌循環させるこ
とができる。Further, in another invention of the present invention, downward and upward tuyere inclined at a predetermined angle at the position of the slag layer of the furnace wall are provided point-symmetrically with respect to the furnace core, so that the tuyere is oxidizable. By blowing gas, the slag layer can be agitated and circulated.
第１図はこの発明を実施した転炉の一実施例の断面図で
ある。図において、（１）は転炉本体、（２）は酸素ま
たは酸素とコークスあるいは石灰等の吹込み管で、転炉
本体（１）の炉底の吹込み口に連通している。（４）は
溶湯、（８）はスラグ層、（10），（10a）は炉壁に設
けた羽口である。羽口（10），（10a）は互いに炉芯に
対して点対称であると共に、上下に間隔を開けて設けら
れ、その上下方向の位置がスラグ層（８）の範囲にある
ように設けられており、しかも、羽口（10）は下向きに
設けられていて、その角度θは−60゜≦θ＜０の範囲に
する。また羽口（10a）は上向きに設けられ、その角度
θは０゜＜θ≦60゜の範囲にする。FIG. 1 is a sectional view of an embodiment of a converter for carrying out the present invention. In the figure, (1) is a converter main body, and (2) is a blow pipe for oxygen or oxygen and coke, lime, etc., which communicates with the blow-in port of the bottom of the converter main body (1). (4) is a molten metal, (8) is a slag layer, and (10) and (10a) are tuyere provided on the furnace wall. The tuyere (10), (10a) are point-symmetric with respect to the core of the furnace, and are vertically spaced from each other so that their vertical positions are within the range of the slag layer (8). In addition, the tuyere (10) is provided downward, and the angle θ is within the range of −60 ° ≦ θ <0. Further, the tuyere (10a) is provided upward, and the angle θ thereof is in the range of 0 ° <θ ≦ 60 °.
以上のように構成された転炉において、吹込み管（２）
から酸素，石灰等を溶湯（４）へ吹込むと、激しく反応
が起きて溶湯（４）は矢印ＡおよびＢ方向に激しく撹拌
される。溶湯（４）とスラグ層（８）の界面では活発な
スラグ−メタル反応も起きる。In the converter configured as described above, the blow pipe (2)
When oxygen, lime or the like is blown into the molten metal (4) from the above, a violent reaction occurs and the molten metal (4) is vigorously stirred in the directions of arrows A and B. An active slag-metal reaction also occurs at the interface between the molten metal (4) and the slag layer (8).
一方羽口（10），（10a）からは、酸化性ガス（酸素，
または酸素を含むガス）がスラグ層（８）に吹込まれ
る。On the other hand, from the tuyere (10), (10a), oxidizing gas (oxygen,
Or gas containing oxygen) is blown into the slag layer (8).
そのため、溶湯（４）から多量に発生して上昇し、スラ
グ層（８）にある一酸化炭素は燃焼して二酸化炭素にな
ると共に、その燃焼反応に伴う高熱がスラグ層（８）に
保有されることになる。さらに羽口（10），（10a）の
位置関係から、スラグ層（８）は矢印Ｃ方向に激しく撹
拌循環し、スラグ層（８）は矢印Ｃ方向に激しく撹拌循
環し、スラグ層（８）と溶湯（４）との界面も激しく遷
移して、スラグ層（８）の高温の燃焼熱が溶湯（４）へ
高効率で伝熱される。Therefore, a large amount is generated from the molten metal (4) and rises, carbon monoxide in the slag layer (8) burns to carbon dioxide, and high heat accompanying the combustion reaction is retained in the slag layer (8). Will be. Further, from the positional relationship between the tuyere (10) and (10a), the slag layer (8) vigorously stirs and circulates in the direction of arrow C, the slag layer (8) vigorously stirs and circulates in the direction of arrow C, and the slag layer (8). The interface between the molten metal (4) and the molten metal (4) also violently transitions, and the high-temperature combustion heat of the slag layer (8) is transferred to the molten metal (4) with high efficiency.
なお、上記実施例の説明は転炉における製錬の場合であ
るが、直接溶融還元による製鉄（以下直接還元法とい
う）においても同様の方法により溶湯（４）へ一酸化炭
素の高温の燃焼熱を付加することができる。The description of the above examples is for the case of smelting in a converter, but also in iron making by direct smelting reduction (hereinafter referred to as the direct reduction method), the same method is used to produce high-temperature combustion heat of carbon monoxide into the molten metal (4). Can be added.
直接還元法においては、製鋼炉はほぼ第１図に示したよ
うな炉が用いられ、鉄鉱石粉が石炭，コークス等の粉状
固体還元材と共に吹込み管（２）から炉内に吹込むか、
あるいは、炉の上方から炉内に装入して溶融状態で、主
として次式のような還元反応を行う。In the direct reduction method, a furnace as shown in Fig. 1 is used as a steelmaking furnace, and whether iron ore powder is blown into the furnace through a blowing pipe (2) together with powdered solid reducing materials such as coal and coke. ,
Alternatively, the reduction reaction as shown in the following formula is mainly performed in a molten state by charging the furnace from above.
Fe2O3＋3C→2Fe＋3CD ……（１） そして大量に発生する一酸化炭素は、一部が還元剤とし
て酸化鉄（Fe2O3）の還元反応に使われるが、多くは上
昇する。しかし上昇した一酸化炭素は羽口（10），（10
a）により酸素がスラグ層（８）と共に、撹拌，循環し
ているので、酸素を効率よく燃焼し、高温の燃焼熱を溶
湯（４）へ効率よく付加される。Fe 2 O 3 ＋ 3C → 2Fe ＋ 3CD ・ ・ ・ (1) And a large amount of carbon monoxide is used as a reducing agent for the reduction reaction of iron oxide (Fe 2 O 3 ), but most of it rises. However, the increased carbon monoxide is due to the tuyere (10), (10
Oxygen is agitated and circulated together with the slag layer (8) by a), so that the oxygen is efficiently burned and the high-temperature combustion heat is efficiently added to the molten metal (4).
第２図はこの発明の他の実施例の断面図で第１図で示し
た転炉本体（１）Ｉ−Ｉ線の端面を示すので、炉芯に対
して点対称の羽口（10）〜（10c）が６ケ所に設けられ
ている場合を示したものである。図において、羽口（10
a），（10），（10c）と羽口（10e），（10a），（10
d），はそれぞれ炉芯に対して点対称であり、羽口（10
b），（10），（10c）は角度θが−60゜≦θ＜０゜の範
囲で下向きに設けられ、羽口（10d），（10a），（10
e）は角度θが−０゜＜θ≦60゜の範囲で上向きに設け
られている。なお上向き、および下向きの角度θは同一
でもよいか、角度θをそれぞれ異ならせてもよい。この
ように炉壁（12）に設ける羽口（10）〜（10e）の数を
多くすると、スラグ層（８）の撹拌循環の効率が高まる
と共に一酸化炭素の燃焼効率を向上する。FIG. 2 is a sectional view of another embodiment of the present invention showing the end face of the converter body (1) II line shown in FIG. 1, so that the tuyere (10) is point-symmetric with respect to the core. It shows the case where (10c) are provided at 6 places. In the figure, tuyere (10
a), (10), (10c) and tuyere (10e), (10a), (10
d) and are respectively point-symmetric with respect to the core, and the tuyere (10
b), (10), and (10c) are provided downward in the range of an angle θ of −60 ° ≦ θ <0 °, and tuyere (10d), (10a), (10
In e), the angle θ is set upward in the range of −0 ° <θ ≦ 60 °. The upward and downward angles θ may be the same, or the angles θ may be different. Increasing the number of tuyere (10) to (10e) provided on the furnace wall (12) in this way enhances the efficiency of stirring and circulation of the slag layer (8) and the combustion efficiency of carbon monoxide.
なお、第２図で示すような羽口（10）〜（10e）を設け
た炉で、直接還元法により製鉄すると、溶湯（４）が50
tで鉄鉱石添加速度840kg/min（溶銑生成速度32TON/Hr）
の場合、従来法によると、石炭添加量が490kg/min、酸
素使用量が365Nm3/minであったのに対し、石炭使用量が
380kg/min、酸素使用量が275Nm3/minとなり、原料の使
用量が少なくなることが実験により確かめられている。In addition, when iron is produced by the direct reduction method in a furnace equipped with tuyere (10) to (10e) as shown in FIG.
Iron ore addition rate 840kg / min at t (hot metal production rate 32TON / Hr)
According to the conventional method, the amount of coal added was 490 kg / min and the amount of oxygen used was 365 Nm 3 / min.
It has been confirmed by experiments that the amount of raw material used is small, with 380 kg / min and oxygen usage of 275 Nm 3 / min.
以上説明したようにこの発明の方法は、転炉による製錬
および直接還元法において、エネルギー価値の高い高温
の一酸化炭素の燃焼熱を高効率に溶湯に着熱できるの
で、製錬においてはスクラップ使用量が増加し、また直
接還元法においては原料，副原料の原単位を減少させる
という効果があるばかりか、エネルギーバランスが効率
化するという効果がある。As described above, in the smelting by the converter and the direct reduction method, the method of the present invention can efficiently heat the combustion heat of high-temperature carbon monoxide having a high energy value to the molten metal, and therefore, in the smelting, scrap In addition to the effect of increasing the amount of use and reducing the basic unit of raw materials and auxiliary raw materials in the direct reduction method, it also has the effect of improving the energy balance.
また、この別の発明においては、スラグ層を撹拌循環さ
せることができ、二次燃焼用ランスに付帯する設備が不
要になるという効果がある。Further, according to this other invention, the slag layer can be stirred and circulated, and there is an effect that the equipment incidental to the secondary combustion lance is unnecessary.
第１図はこの発明の一実施例の断面図、第２図はこの発
明の他の実施例の断面図である。 図において、（１）は転炉本体、（２）は吹込み口、
（４）は溶湯、（８）はスラグ層、（10）〜（10e）は
羽口、（12）は炉壁である。FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of another embodiment of the present invention. In the figure, (1) is a converter main body, (2) is a blowing port,
(4) is a molten metal, (8) is a slag layer, (10) to (10e) are tuyere, and (12) is a furnace wall.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 寺田 修 神奈川県横須賀市根岸町５−８―27 (56)参考文献 特開 昭61−221322（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Terada 5-8-27 Negishi Town, Yokosuka City, Kanagawa Prefecture (56) Reference JP-A-61-221322 (JP, A)
Claims (2)
る高温の燃焼熱を、上記スラグ層を攪拌循環させること
により溶湯へ伝熱する際に、 炉芯に対して点対称で、かつスラグ層の範囲に相当する
炉壁に設けられた水平方向に対する傾斜角θを０＜θ≦
60゜の範囲とした上向きの羽口と、水平方向に対する傾
斜角θを−60゜≦θ＜０の範囲とした下向きの羽口とか
ら酸化性ガスを吹込むことを特徴とする精錬または製錬
での溶湯への熱付加方法。1. When the high-temperature combustion heat generated by burning carbon monoxide in the slag layer is transferred to the molten metal by stirring and circulating the slag layer, it is point-symmetric with respect to the furnace core, and The inclination angle θ with respect to the horizontal direction provided on the furnace wall corresponding to the range of the slag layer is 0 <θ ≦
Refining or manufacturing characterized by blowing an oxidizing gas from an upward tuyere in the range of 60 ° and a downward tuyere in the inclination angle θ with respect to the horizontal direction of −60 ° ≦ θ <0 Method of adding heat to molten metal in smelting.
囲に相当する炉壁に上向きと下向きとからなる羽口を少
なくとも２カ所以上設け、上記上向きの羽口の水平方向
に対する傾斜角θは０＜θ≦60゜の範囲で、上記下向き
の羽口水平方向に対する傾斜角θは−60゜≦θ＜０の範
囲にあるようにしたことを特徴とする製鋼炉。2. The tuyeres, which are point-symmetric with respect to the furnace core and correspond to the range of the slag layer, are provided with at least two tuyere upwards and downwards, and the upward inclination of the tuyere with respect to the horizontal direction. The steelmaking furnace is characterized in that the angle θ is in the range of 0 <θ ≦ 60 °, and the tilt angle θ with respect to the horizontal direction of the downward tuyere is in the range of −60 ° ≦ θ <0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60226945A JPH0699736B2 (en) | 1985-10-14 | 1985-10-14 | Method for adding heat to molten metal in refining or smelting and steelmaking furnace therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60226945A JPH0699736B2 (en) | 1985-10-14 | 1985-10-14 | Method for adding heat to molten metal in refining or smelting and steelmaking furnace therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6286109A JPS6286109A (en) | 1987-04-20 |
| JPH0699736B2 true JPH0699736B2 (en) | 1994-12-07 |
Family
ID=16853073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60226945A Expired - Lifetime JPH0699736B2 (en) | 1985-10-14 | 1985-10-14 | Method for adding heat to molten metal in refining or smelting and steelmaking furnace therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0699736B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61221322A (en) * | 1985-03-27 | 1986-10-01 | Kawasaki Heavy Ind Ltd | Melting and refining method for metallic raw material |
-
1985
- 1985-10-14 JP JP60226945A patent/JPH0699736B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6286109A (en) | 1987-04-20 |
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