JP2560667B2 - Hot metal production method - Google Patents
Hot metal production methodInfo
- Publication number
- JP2560667B2 JP2560667B2 JP23354887A JP23354887A JP2560667B2 JP 2560667 B2 JP2560667 B2 JP 2560667B2 JP 23354887 A JP23354887 A JP 23354887A JP 23354887 A JP23354887 A JP 23354887A JP 2560667 B2 JP2560667 B2 JP 2560667B2
- Authority
- JP
- Japan
- Prior art keywords
- scrap
- gas
- furnace
- coke
- combustion
- 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
Landscapes
- Manufacture Of Iron (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (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 この発明は筒型炉を使用してスクラップを溶解する方
法に係り、より詳しくは酸素等の支燃性ガスによりコー
クスを燃焼させて発生する還元性ガスを炉内で２次燃焼
させてスクラップを溶解する方式の溶銑製造方法に関す
る。Description: TECHNICAL FIELD The present invention relates to a method for melting scrap by using a tubular furnace, and more specifically, a reducing property generated by burning coke with a combustion-supporting gas such as oxygen. The present invention relates to a hot metal manufacturing method in which gas is secondarily burned in a furnace to melt scrap.
発明の背景 転炉製鋼法の発達に伴い鉄鋼の分野では高炉−転炉一
貫体制が確立されてから久しく、その間鋼の生産能率は
飛躍的な向上を遂げてきたが、近年世界的な景気の停滞
期を迎えるに及んで鉄鋼生産量も増加傾向から横ばいも
しくは減少傾向へと転換しつつある。BACKGROUND OF THE INVENTION It has been a long time since the integrated blast furnace-converter system was established in the field of steel with the development of converter steelmaking, and during that time, steel production efficiency has improved dramatically, but in recent years the world economy With the stagnation period, steel production is shifting from an increasing trend to a flat or decreasing trend.
一方、製鋼原料としてのスクラップは近年増加傾向に
あり、将来も増加することが予想されることから、製鋼
原料に占めるスクラップの割合は一段と増加する傾向に
ある。On the other hand, since scrap as a steelmaking raw material has been increasing in recent years and is expected to increase in the future, the ratio of scrap to the steelmaking raw material tends to further increase.
ところで、従来スクラップはほとんど電気炉で使用さ
れてきた。しかし、電気炉の場合は周知の通りスクラッ
プの溶解・精錬に多くの電力を消費するため、我が国の
ように電力価格が著しく高い国ではコストアップとなり
好ましくない。By the way, most of the conventional scraps have been used in electric furnaces. However, in the case of an electric furnace, as is well known, a large amount of electric power is consumed for melting and refining scraps.
そこで、電気炉によらずに経済的にスクラップを溶解
・精錬する方法として、高送酸能力を有する転炉の余剰
生産能力を利用して安価な炭材を用いたスクラップの溶
解・精錬方法が検討されるようになってきた。Therefore, as a method of melting and refining scrap economically without using an electric furnace, there is a method of melting and refining scrap using inexpensive carbonaceous materials by utilizing the surplus production capacity of a converter having a high acid supply capacity. Is being considered.
従来の技術 こうした背景を踏まえて、従来以下に示す転炉を利用
した溶解・精錬方法が提案されている。2. Description of the Related Art Based on this background, a melting / refining method using a converter shown below has been proposed.
複合転炉によるスクラップ溶解方法 この方法は第２図に示すごとく、上下吹転炉（11）に
装入したコークス（12）に上吹きランス（15）および／
または炉底羽口（13）より吹込む酸素により着火した後
スクラップ（14）を装入し、上吹ランス（15）と横吹羽
口（16）による酸素の上吹および炉底羽口（13）から酸
素を吹込んでスクラップ（14）を赤熱化させ、この後赤
熱化したスクラップ上に新たにスクラップおよび炭材、
造滓剤を投入して上吹酸素により炭材を燃焼させるとと
もに、２次燃焼を併用してスクラップを溶解する方法で
ある。Method for melting scrap by compound converter As shown in Fig. 2, this method is used for the upper blowing lance (15) and / or the coke (12) charged in the vertical blowing converter (11).
Alternatively, after igniting with oxygen blown from the bottom tuyeres (13), the scrap (14) is loaded, and the top blowing lance (15) and side blow tuyeres (16) blow oxygen upward and the bottom tuyeres (13). ) To blow oxygen into the scrap (14) so that it becomes red-hot, and then scrap and carbonaceous material are newly added to the red-heated scrap.
This is a method in which a slag-making agent is charged and the carbonaceous material is burned by top-blown oxygen, and secondary combustion is also used to dissolve scrap.
リアクター製鉄法（特開昭61−15908号） この方法は溶融鉄を収容した炉内にスクラップを装入
し、炭素質材料と酸素を吹込んで炭材を燃焼させ、その
燃焼熱でスクラップを溶解し、発生するCOを含む排ガス
をガス燃焼塔に導き、酸素を加えてCOを燃焼させて排ガ
スの温度を高め、この高温の排ガスで炉内投入前のスク
ラップを予熱する方法である。Reactor iron-making method (Japanese Patent Laid-Open No. 61-15908) In this method, scrap is charged into a furnace containing molten iron, carbonaceous material and oxygen are blown to burn carbonaceous material, and the heat of combustion melts the scrap. Then, the exhaust gas containing the generated CO is guided to the gas combustion tower, CO is burned by adding oxygen to raise the temperature of the exhaust gas, and the scrap before injection into the furnace is preheated with this high-temperature exhaust gas.
KS法（特公昭56−8085号） この方法は転炉にスクラップを装入した後、炉底より
天然ガスまたは重油を酸素とともに吹込み、約1000℃付
近で装入原料を予熱した後、炉底より微粒コークスおよ
び微粒炭を吹込んで酸素で燃焼させ、スクラップを完全
に溶解した後脱硫、脱炭を行なう方法である。KS method (Japanese Patent Publication No. Sho 56-8085) This method involves charging scrap into a converter, blowing natural gas or heavy oil with oxygen from the bottom of the furnace, preheating the charging raw material at around 1000 ° C, and then In this method, fine coke and fine coal are blown from the bottom and burned with oxygen to completely dissolve the scrap, followed by desulfurization and decarburization.
従来技術の問題点 しかし、従来の前記方法には次のような欠点があっ
た。Problems of the prior art However, the conventional method has the following disadvantages.
の方法は、スクラップの溶解に対しては上吹き酸素
が主体となるため、２次燃焼を併用してもスクラップの
上方で燃焼するので、高温ガスはそのまま排出させるた
めのスクラップへの着熱効率が上昇せず、燃料比が高く
なる。また、炉内の還元雰囲気が弱いため加炭・脱硫作
用が弱く、溶解後に脱硫を行なう必要がある。また、ス
クラップ溶解中のスラグ中FeO濃度が高く、耐火物侵蝕
の原因となる。さらに、鉄浴が過熱されヒュームロスに
よる鉄歩留が低くなる欠点がある。In the above method, since the top-blown oxygen is the main component for melting the scrap, it burns above the scrap even when it is used in combination with secondary combustion. Therefore, the heat transfer efficiency to the scrap for discharging the high temperature gas as it is It does not rise and the fuel ratio increases. Further, since the reducing atmosphere in the furnace is weak, the carburizing / desulfurizing action is weak, and it is necessary to perform desulfurization after melting. Further, the FeO concentration in the slag during melting of the scrap is high, which causes refractory erosion. Further, there is a drawback that the iron bath is overheated and the iron yield due to fume loss is reduced.
の方法は、排ガスを２次燃焼し高温排ガスをスクラ
ップの充填層を通過させるので、熱効率は良好である
が、ガス燃焼塔、スクラップ予熱室を含めた炉全体の構
造が複雑となる。また、炉内の還元雰囲気が弱いため脱
硫作用が弱く、精錬期に十分脱硫する必要がある。さら
に、と同様、高FeO濃度のスラグによる耐火物侵蝕、
および低鉄歩留の欠点を有する。In this method, the exhaust gas is secondarily burned and the high-temperature exhaust gas is passed through the packed bed of scrap, so that the thermal efficiency is good, but the structure of the entire furnace including the gas combustion tower and the scrap preheating chamber becomes complicated. Further, since the reducing atmosphere in the furnace is weak, the desulfurization action is weak, and it is necessary to sufficiently desulfurize during the refining period. Furthermore, as in the case of refractory erosion due to high FeO concentration slag,
And has the disadvantage of low iron yield.
の方法は、炉底部より送酸すので、炉内の酸素ポテ
ンシャルが高く、加炭・脱硫作用が弱く、生成した溶銑
が低Ｃ濃度、高Ｓ濃度となりやすい欠点があり、さらに
前記と同様、スラグによる耐火物侵蝕、低鉄歩留の欠点
も有する。In the method of 1, since oxygen is fed from the bottom of the furnace, the oxygen potential in the furnace is high, the carburizing / desulfurizing action is weak, and the generated hot metal tends to have a low C concentration and a high S concentration. It also has the drawbacks of erosion of refractories by slag and low iron yield.
この発明は従来の前記低熱効率、スクラップ溶解期の
低加炭および低脱硫作用、低鉄歩留、高FeO濃度スラグ
による耐火物侵蝕等の問題を一挙解決するためなされた
ものである。The present invention has been made to solve the problems of conventional low thermal efficiency, low carburization and low desulfurization action during scrap melting period, low iron yield, and refractory erosion due to high FeO concentration slag.
問題点を解決するための手段 この発明は従来の前記問題点を解決する手段として、
炉腹部に複数段に設けた気体吹込口と炉底に羽口を有す
る筒肩溶解炉を用い、この溶解炉内にコークスを最下段
の気体吹込口レベルより上で上段の気体吹込口レベルよ
り下のレベルまで装入し、このコークス充填層の上にス
クラップを装入した後、前記コークス充填層に最下段の
気体吹込口および／または炉底羽口より支燃性ガスを吹
込んでCOガスを発生させ、発生したCOガスをスクラップ
充填層内で上段の気体吹込口より吹込む支燃性ガスによ
り燃焼させてスクラップを溶解する溶銑製造方法を提案
するものである。Means for Solving the Problems The present invention provides a means for solving the above-mentioned conventional problems.
Using a cylinder shoulder melting furnace with gas inlets provided in multiple stages in the furnace belly and tuyeres in the furnace bottom, coke is placed in this furnace above the lowest gas inlet level and above the upper gas inlet level. After charging to the lower level and charging scrap on this coke packed bed, CO gas is injected into the coke packed bed by injecting a combustion-supporting gas from the lowest gas inlet and / or tuyere bottom tuyere. The present invention proposes a hot metal production method in which the generated CO gas is combusted with the combustion-supporting gas blown from the upper gas injection port in the scrap packed bed to melt the scrap.
作用 第１図はこの発明方法を実施するための好適な筒型溶
解炉を示す概略図で、（１）は溶解炉の炉体、（２−
１）（２−２）は炉腹部に上下方向に複数段に設けた気
体吹込口、（３）は炉底羽口、（４）はコークス充填
層、（５）はスクラップ層である。なお、気体吹込口
（２−１）（２−２）はそれぞれ炉体円周上に設けられ
ている。Operation FIG. 1 is a schematic view showing a suitable cylindrical melting furnace for carrying out the method of the present invention, (1) is a furnace body of the melting furnace, and (2-
1) (2-2) is a gas injection port provided in the furnace abdominal portion in a plurality of vertical stages, (3) is a tuyere bottom tuyer, (4) is a coke packed layer, and (5) is a scrap layer. The gas inlets (2-1) and (2-2) are provided on the circumference of the furnace body.
すなわち、この発明は筒型合溶解炉の最下段の気体吹
込口（２−１）レベルより上で上段の気体吹込み口（２
−２）レベルより下のレベルまでコークス充填層（４）
を形成するとともに、このコークス充填層（４）の上に
スクラップ層（５）を形成する。That is, the present invention is that the gas injection port (2) of the upper stage above the gas injection port (2-1) of the lowest stage of the tubular compound melting furnace.
-2) Coke packed bed (4) to a level below the level
And a scrap layer (5) is formed on the coke packed layer (4).
炉内に前記コークス充填層（４）およびスクラップ層
（５）を形成すると、コークス充填層（４）に臨む下段
の気体吹込口（２−１）および／または炉底羽口（３）
より支燃性ガスを吹込みコークスを燃焼させる。必要に
応じて前記羽口から炭化水素系燃料を吹込む。この支燃
性ガスの吹込みによりコークスおよび炭化水素系燃料が
燃焼して生成するCO,H2ガスは上昇してスクラップ層
（５）へ浸入する。この時、スクラップ層（５）に臨む
上段の気体吹込口（２−２）より支燃性ガスを吹込み、
スクラップ層内へ侵入してきたCO,H2ガスを燃焼させ、
その燃焼熱によりスクラップを加熱・溶解せしめる。溶
解した金属はコークス充填層（４）内を滴下して炉底湯
溜り（６）に溜る。When the coke packed layer (4) and the scrap layer (5) are formed in the furnace, the lower gas inlet (2-1) and / or the bottom tuyeres (3) of the coke packed layer (4) are exposed.
Blow more supporting gas to burn coke. If necessary, a hydrocarbon fuel is blown from the tuyere. Due to the blowing of the combustion-supporting gas, the CO, H 2 gas generated by the combustion of the coke and the hydrocarbon fuel rises and enters the scrap layer (5). At this time, the combustion-supporting gas is blown from the upper gas blowing port (2-2) facing the scrap layer (5),
Combusting the CO and H 2 gas that has entered the scrap layer,
The combustion heat heats and melts the scrap. The melted metal drops inside the coke packed bed (4) and collects in the furnace bottom hot water pool (6).
なお、上段の気体吹込口（２−２）より吹込む支燃性
ガスは、コークス充填層（４）内で生成する排ガス中の
CO濃度が増加した段階でスクラップ層（５）に吹込まれ
る。In addition, the combustion-supporting gas blown from the gas blow-in port (2-2) in the upper stage is contained in the exhaust gas generated in the coke packed bed (4).
It is blown into the scrap layer (5) when the CO concentration increases.
上記のごとく、この発明方法ではコークスおよび炭化
水素燃料が燃焼して発生する高温CO,H2ガスがスクラッ
プ層（５）内を通過する時に、２次燃焼させる方式であ
るから、燃焼フレームから炉壁への輻射伝熱による損失
がなく、また２次燃焼ガスがスクラップ層（５）内を通
過することにより熱交換率が向上し、さらに簡素な炉体
形状により炉体熱損失を軽減できる。As described above, in the method of the present invention, the high temperature CO, H 2 gas generated by the combustion of coke and hydrocarbon fuel is secondarily burned when passing through the scrap layer (5). There is no loss due to radiative heat transfer to the wall, the secondary combustion gas passes through the scrap layer (5), the heat exchange rate is improved, and the furnace body heat loss can be reduced by the simpler furnace shape.
また、炉底部にコークス充填層（４）を形成している
ので、鉄浴中の酸素ポテンシャルを低く維持でき、加炭
・脱硫作用にすぐれ、良質の溶銑が得られる。Further, since the coke filling layer (4) is formed at the bottom of the furnace, the oxygen potential in the iron bath can be kept low, the carburizing / desulfurizing action is excellent, and good quality hot metal can be obtained.
さらに、この発明ではコークスを燃焼させるための支
燃性ガス吹込口（２−１）をこのコークス充填層（４）
に臨ませかつ湯溜り（６）に浸漬しないレベルに設けて
いるので、この気体吹込口（２−１）からの送ガス量を
増加することにより炉底羽口からの支燃性ガス吹込み量
を減少もしくは停止することができる結果、前記の従来
法では不可能であった炉下部強還元雰囲気の確保が可能
となる。Further, in the present invention, the coke-supporting gas blowing port (2-1) for burning the coke is provided in the coke packed bed (4).
Since it is installed at a level not facing the pool and not immersed in the pool (6), the amount of gas fed from the gas inlet (2-1) is increased to inject the combustion-supporting gas from the bottom tuyeres of the furnace. As a result of being able to reduce or stop the amount, it becomes possible to secure a strong reducing atmosphere in the lower part of the furnace, which was not possible with the above-mentioned conventional method.
そして、鉄浴に直接酸素ジェットが当らないため溶銑
の過熱を防止でき、鉄の蒸発損失が軽減され鉄歩留が大
きく向上するとともに、炉底部で強還元雰囲気を維持で
きるので、スラグ中FeO濃度を低く保つことができ、ス
ラグによる耐火物侵蝕を抑制できる。And because the oxygen jet does not directly hit the iron bath, overheating of the hot metal can be prevented, the evaporation loss of iron is reduced, the iron yield is greatly improved, and a strong reducing atmosphere can be maintained at the bottom of the furnace, so the FeO concentration in the slag is reduced. Can be kept low, and refractory erosion due to slag can be suppressed.
さらに、スクラップの溶解終了後、必要に応じて脱硫
し、脱硫完了後スラグを除去して通常の転炉吹錬を実施
することも可能である。Further, it is also possible to perform desulfurization, if necessary, after the completion of melting of the scrap, and after the completion of desulfurization, remove the slag and perform normal converter blowing.
実施例 第１図に示す構造で第１表に示す装置仕様の筒型溶解
炉を用い、第２表に示す操業条件でスクラップを溶解し
た際の結果を、第２図に示す従来の溶解炉で実施した場
合と比較して第３表に示す。Example A conventional melting furnace shown in FIG. 2 shows the results of melting a scrap under the operating conditions shown in Table 2 using a cylindrical melting furnace having the structure shown in FIG. The results are shown in Table 3 in comparison with the case of carrying out the above.
第３表より、本発明法は従来法に比べ燃料比が低く、
高Ｃ濃度、低Ｓ濃度の溶銑が得られ、高熱効率、高加炭
・高脱硫作用を確認できた。また、従来法と比較して、
鉄歩留が高く、かつスラグ中のFeO濃度は低くなってお
り、耐火物の侵蝕はほとんど見られなかった。さらに、
燃料比についても、従来法では高価なコークスを100％
使用するのに対し、本発明法では安価な微粉炭が50％を
占めており、この点においも有利であることがわかる。From Table 3, the method of the present invention has a lower fuel ratio than the conventional method,
Hot metal with high C concentration and low S concentration was obtained, and high thermal efficiency, high carburization and high desulfurization action were confirmed. Also, compared to the conventional method,
The iron yield was high, the FeO concentration in the slag was low, and almost no erosion of the refractory was observed. further,
Regarding the fuel ratio, 100% of expensive coke is produced by the conventional method.
In contrast to the use, the inexpensive pulverized coal accounts for 50% in the method of the present invention, and it can be seen that this point is also advantageous.
発明の効果 以上説明したごとく、この発明方法によれば、以下に
示す効果を奏する。 Effects of the Invention As described above, according to the method of the present invention, the following effects can be obtained.
コークスが燃焼して発生する高温ガスとスクラップ
の熱交換効率が高いので、高熱効率操業を達成できる。Since the heat exchange efficiency between the high temperature gas generated by the combustion of coke and the scrap is high, a high thermal efficiency operation can be achieved.
スクラップ充填層内での燃焼フレームから炉壁への
輻射伝熱による熱損失軽減と熱交換効率を向上できるの
で、２次燃焼の着熱効率を改善でき、さらに簡素な炉体
構造による炉体熱損失を軽減できる。The heat loss can be reduced and the heat exchange efficiency can be improved by the radiant heat transfer from the combustion frame to the furnace wall in the scrap packed bed, so that the heat transfer efficiency of the secondary combustion can be improved, and the furnace body heat loss due to the simple furnace structure Can be reduced.
鉄浴中酸素ポテンシャルを低く維持できるととも
に、炉下部の強還元性雰囲気を確保することが可能であ
るため、スクラップ溶解操業中における加炭・脱硫作用
にすぐれ、良質の溶銑を製造することができる。Since the oxygen potential in the iron bath can be kept low and a strong reducing atmosphere can be secured in the lower part of the furnace, it excels in carburization and desulfurization during scrap melting operation, and high quality hot metal can be manufactured. .
また、炉下部の強還元性雰囲気を確保できる結果、
スラグ中FeO濃度を低く保つことができるのでスラグに
よる耐火物侵蝕を抑制でき、耐火物コストを軽減でると
ともに、鉄歩留が高い。Also, as a result of being able to secure a strong reducing atmosphere in the lower part of the furnace,
Since the FeO concentration in the slag can be kept low, the erosion of refractories by slag can be suppressed, the refractory cost can be reduced, and the iron yield is high.
スクラップの溶解終了後、必要に応じて通常の転炉
吹錬を実施できるので、同一反応容器で鋼精錬の実施も
可能である。After the melting of the scrap is completed, normal converter blowing can be performed if necessary, so that steel refining can be performed in the same reaction vessel.
第１図はこの発明方法を実施するための好適な筒型溶解
炉を示す概略図である。 第２図は従来の溶銑製造方法の一例を示す概略図であ
る。 １……溶解炉炉体 ２−1,2−２……気体吹込口 ３……炉底羽口 ４……コークス充填層 ５……スクラップ層FIG. 1 is a schematic view showing a suitable cylindrical melting furnace for carrying out the method of the present invention. FIG. 2 is a schematic view showing an example of a conventional hot metal manufacturing method. 1 ... Melting furnace furnace body 2-1, 2-2 ... Gas injection port 3 ... Furnace bottom tuyere 4 ... Coke filling layer 5 ... Scrap layer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−280315（ＪＰ，Ａ) 特開 昭62−60805（ＪＰ，Ａ) 特開 昭64−42511（ＪＰ，Ａ) 特開 昭61−15908（ＪＰ，Ａ) 特公 昭56−8085（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 62-280315 (JP, A) JP 62-60805 (JP, A) JP 64-42511 (JP, A) JP 61- 15908 (JP, A) Japanese Patent Sho 56-8085 (JP, B1)
Claims (1)
に羽口を有する筒型溶解炉に、コークスを最下段の気体
吹込口レベルより上で上段の気体吹込口レベルより下の
レベルまで装入し、このコークス充填層の上にスクラッ
プを装入した後、前記コークス充填層に最下段の気体吹
込口および／または炉底羽口より支燃性ガスを吹込んで
COガスを発生させ、発生したCOガスをスクラップ充填層
内で上段の気体吹込口より吹込む支燃性ガスにより燃焼
させてスクラップを溶解することを特徴とする溶銑製造
方法。1. A coke is provided in a tubular melting furnace having gas inlets provided in a plurality of stages in the furnace belly and tuyeres in the bottom of the furnace, and coke above the gas inlet level in the lowest stage and below the gas inlet level in the upper stage. To the level of, the scrap is charged on the coke packed bed, and then the coke packed bed is blown with a combustion-supporting gas from the bottom gas inlet and / or the tuyere bottom tuyere.
A method for producing hot metal, characterized in that CO gas is generated and the generated CO gas is burned by a combustion-supporting gas blown from an upper gas blowing port in a scrap packed bed to melt the scrap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23354887A JP2560667B2 (en) | 1987-09-17 | 1987-09-17 | Hot metal production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23354887A JP2560667B2 (en) | 1987-09-17 | 1987-09-17 | Hot metal production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6475614A JPS6475614A (en) | 1989-03-22 |
| JP2560667B2 true JP2560667B2 (en) | 1996-12-04 |
Family
ID=16956785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23354887A Expired - Lifetime JP2560667B2 (en) | 1987-09-17 | 1987-09-17 | Hot metal production method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2560667B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2089330B1 (en) * | 2006-11-02 | 2014-07-09 | Rockwool International A/S | Method and apparatus for the production of mineral fibres |
-
1987
- 1987-09-17 JP JP23354887A patent/JP2560667B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6475614A (en) | 1989-03-22 |
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