JP2638861B2 - Melt reduction method - Google Patents
Melt reduction methodInfo
- Publication number
- JP2638861B2 JP2638861B2 JP62303940A JP30394087A JP2638861B2 JP 2638861 B2 JP2638861 B2 JP 2638861B2 JP 62303940 A JP62303940 A JP 62303940A JP 30394087 A JP30394087 A JP 30394087A JP 2638861 B2 JP2638861 B2 JP 2638861B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- gas
- smelting
- reduction
- preheating
- 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
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Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は炭材を燃料および還元剤として用い、鉄鉱
石を転炉型製錬炉内において溶融状態で還元する溶融還
元法に関する。The present invention relates to a smelting reduction method for reducing iron ore in a molten state in a converter type smelting furnace using a carbonaceous material as a fuel and a reducing agent.
［従来の技術］ 溶融還元法は、高炉製銃法に代るものであり、高炉製
銃法においては高炉の建設費が高く、広大な敷地が必要
であるという高炉製銃法の欠点を解消すべく、近年に至
り開発されたものである。[Prior art] The smelting reduction method is an alternative to the blast furnace gun making method. The blast furnace gun making method eliminates the disadvantages of the blast furnace gun making method that the construction cost of the blast furnace is high and a vast site is required. It has been developed in recent years.
この還元法においては、鉄鉱石を製錬炉からの排出ガ
スで予備還元して炭材、造滓剤とともに製錬炉内に装入
し、また酸素ガスまたは撹拌用ガスが前記製錬炉内に吹
き込まれる。In this reduction method, iron ore is preliminarily reduced with exhaust gas from a smelting furnace and charged into a smelting furnace together with a carbonaceous material and a slag-making agent. Is blown into
そうすると炭材が予め装入されてある溶銃に溶解する
とともに、炭材のＣ或は浴中［Ｃ］が酸素ガスによって
酸化される。このときの酸化熱によって鉱石が溶融され
るとともに、鉱石が炭材中のＣによって還元される。溶
銃から発生するCOガスは過剰に吹き込まれる酸素ガスに
より２次燃焼されてCO2ガスになる。このCO2ガスの顕熱
は、溶銃上を覆っているスラグに伝達され、次いで溶銃
に伝達され、上記鉄鉱石の還元に必要な熱が供給され
る。前記２次燃焼による顕熱が溶銃に伝達される割合即
ち直熱効率を高めることはこのプロセスの熱効率を向上
させる上で極めて重要なことであり、前記熱効率を高め
るためには上吹き酸素ランスからの酸素により製錬炉内
のCOガスを出来るだけ燃焼させて炉内のガス温度を高く
することが効果的である。Then, the carbonaceous material is dissolved in the previously loaded gun, and the carbonaceous material or C in the bath is oxidized by oxygen gas. The ore is melted by the heat of oxidation at this time, and the ore is reduced by C in the carbonaceous material. The CO gas generated from the gun is subjected to secondary combustion by the excessively blown oxygen gas to become CO 2 gas. The sensible heat of this CO 2 gas is transmitted to the slag covering the gun, and then to the gun to supply the heat required for the reduction of the iron ore. It is extremely important to increase the rate at which the sensible heat due to the secondary combustion is transferred to the gun, that is, the direct heat efficiency, in order to improve the thermal efficiency of this process. It is effective to burn CO gas in the smelting furnace as much as possible with the oxygen of the furnace to raise the gas temperature in the furnace.
［発明が解決しようとする問題点］ しかしながら、上記のように２次燃焼を十分に行うこ
とは炉内の発生ガスの温度を上げ同時に酸化度［（H2O
＋CO2）／（H2＋H2O＋CO＋CO2）、以下これを単にODと
いう〕を上げることになる。こうすると２次燃焼により
生じたCO2ガスは高温であるため炉側壁の溶損が激し
く、また前記製錬炉から前記予熱予備還元炉に導入され
るガスのODが高く、前記予熱予備還元炉内で鉄鉱石の還
元が効率的に行われないという問題があった。[Problems to be Solved by the Invention] However, performing the secondary combustion sufficiently as described above increases the temperature of the generated gas in the furnace and simultaneously increases the degree of oxidation [(H 2 O
+ CO 2 ) / (H 2 + H 2 O + CO + CO 2 ), which is hereinafter simply referred to as OD]. In this case, since the CO 2 gas generated by the secondary combustion is at a high temperature, erosion of the furnace side wall is severe, and the OD of the gas introduced from the smelting furnace to the preheating pre-reduction furnace is high. There was a problem that the reduction of iron ore was not performed efficiently in the inside.
この発明は、かかる問題点を解決するためになされた
ものであって、製錬炉内の着熱効率を高めると同時に炉
口付近の耐火物を保護し、更に製錬炉の排ガスによる予
熱予備還元炉での鉄鉱石の予備還元率を向上させること
の出来る溶融還元法を提供しようとするものである。The present invention has been made in order to solve such a problem, and it is intended to enhance the heating efficiency in the smelting furnace and at the same time protect the refractory near the furnace port, and furthermore, to perform the preheating pre-reduction by the exhaust gas of the smelting furnace. It is an object of the present invention to provide a smelting reduction method capable of improving the iron ore preliminary reduction rate in a furnace.
［問題点を解決するための手段及び作用］ この発明による溶融還元法は、製錬炉の発生ガスを還
元用ガスとして導入する予熱予備還元炉にて予熱予備還
元された鉄鉱石を予熱予備還元炉から製錬炉に装入する
とともに、炭材と造滓剤とを製錬炉に装入し、脱炭用及
び２次燃焼用ノズルを有する上吹き酸素ランスから酸素
を製錬炉に吹き込み、同時に、製錬炉の側壁及び炉底に
設けられた羽口から撹拌用ガスを吹き込んで鉄鉱石を溶
融還元する方法であって、炉頂付近に設けられた羽口よ
り粉状の炭材を炉内ガス中に吹き込み、上記２次燃焼用
ノズルからの酸素により燃焼して酸化度〔（H2O＋CO2）
／（H2＋H2O＋CO＋CO2）〕が高くかつ高温となった炉内
ガスと粉状の炭材とを反応させ、酸化度を低くさせた改
質ガスを定常的に得ることを特徴とする。[Means and Actions for Solving the Problems] In the smelting reduction method according to the present invention, iron ore that has been preheated and reduced in a preheating prereduction furnace that introduces gas generated in a smelting furnace as a reducing gas is preheated and reduced. While charging the smelting furnace from the furnace, the carbonaceous material and the slag-making agent are charged into the smelting furnace, and oxygen is blown into the smelting furnace from a top-blown oxygen lance having nozzles for decarburization and secondary combustion. A method for smelting and reducing iron ore by injecting stirring gas from the tuyeres provided at the side wall and the bottom of the smelting furnace. Is blown into the gas in the furnace, and is burned by oxygen from the nozzle for secondary combustion, and the degree of oxidation [(H 2 O + CO 2 )
/ (H 2 + H 2 O + CO + CO 2 )] is characterized by reacting the furnace gas with high temperature and high temperature with the powdered carbonaceous material to obtain a reformed gas with low oxidation degree constantly. .
製錬炉に装入された鉄鉱石は炭材から供給されるＣに
より還元されCOガスが発生する。この反応は製錬炉に吹
き込まれる前記撹拌用ガスにより促進される。溶銃の脱
炭反応及び鉄鉱石の還元反応により炉内で発生したCOガ
スは酸素ランスから吹き込まれる酸素により２次燃焼さ
れて炉内ガスの温度は高くなり、前記還元反応に必要な
熱を供給するとともに炉内ガスのODは高くなる。しかし
ながら、本発明においては炉口付近の羽口から炭素粉を
炉内に吹き込んで上記ODが高くなった高温ガスと反応さ
せるので、炉口付近の排ガスはその反応時に生じる吸熱
により低温化すると共にODが低下し、予熱予備還元炉内
の鉄鉱石の予備還元率は高くなる。The iron ore charged into the smelting furnace is reduced by C supplied from carbonaceous material to generate CO gas. This reaction is promoted by the stirring gas blown into the smelting furnace. The CO gas generated in the furnace by the decarburization reaction of the gun and the reduction reaction of the iron ore is subjected to secondary combustion by the oxygen blown from the oxygen lance, and the temperature of the gas in the furnace increases. The OD of the gas inside the furnace increases with the supply. However, in the present invention, carbon powder is blown into the furnace from the tuyere near the furnace port to react with the high-temperature gas having the increased OD. The OD decreases and the pre-reduction rate of iron ore in the pre-heating pre-reduction furnace increases.
［実施例］ 本発明の実施例を添付の図面を参照しながら説明す
る。第１図は本発明の溶融還元法に用いられるプロセス
の説明図である。製錬炉10内には鉄浴11及びスラグ層12
が形成され、副原料である石炭及び造滓材が装入される
第１のシュート13が前記炉の上部に設けられており、ま
た酸素を吹き込む酸素ランス21が炉内に鉛直に挿入され
ている。前記ランスには脱炭用酸素及び２次燃焼用酸素
を噴出するノズル22、23及び粉状の鉄鉱石またた前記副
材料をキャリアーガスと共に吹き込む専用のノズル24が
設けられている。また前記製錬炉10の上方には流動層型
の反応装置である予熱予備還元炉30が設けられ、これに
第２のシュート31から原料である鉄鉱石が供給され、こ
こで予熱、予備還元された鉄鉱石は第３のシュート32か
ら前記製錬炉10に装入される。予熱予備還元炉30に製錬
炉10の排ガスを供給する導管33が設けられ、前記導管33
の製錬炉10に近い位置に製錬炉に無けて炭素粉を吹き込
む羽口14が設けられている。予熱予備還元炉30の排ガス
からダストを除去するホツトサイクロン34、予熱予備還
元炉30の排出ガスの顕熱を利用して蒸気を得る熱交換器
35が設けられている。さらに、前記製錬炉10の側壁及び
炉底には撹拌用のガスを吹き込む羽口25、26が夫々設け
られている。なお、原料事情、設備費用、操業の容易性
等を考慮して予熱予備還元炉として、熱効率の良いシャ
フト炉型もしくは設備費用が低減されまた操業が容易で
あるロータリキルン型のものを設けることは本発明の実
施にあたって全く支障はない。Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an explanatory view of a process used in the smelting reduction method of the present invention. Inside the smelting furnace 10, there is an iron bath 11 and a slag layer 12.
Is formed, and a first chute 13 into which coal and slag forming material as auxiliary materials are charged is provided at the upper part of the furnace, and an oxygen lance 21 for blowing oxygen is inserted vertically into the furnace. I have. The lance is provided with nozzles 22 and 23 for ejecting oxygen for decarburization and oxygen for secondary combustion, and a nozzle 24 dedicated for injecting powdered iron ore or the auxiliary material together with a carrier gas. Above the smelting furnace 10, a preheating pre-reduction furnace 30, which is a fluidized bed type reactor, is provided. Iron ore as a raw material is supplied from a second chute 31 to the pre-heating and pre-reduction furnace. The iron ore is charged from the third chute 32 into the smelting furnace 10. A conduit 33 for supplying the exhaust gas of the smelting furnace 10 to the preheating pre-reduction furnace 30 is provided.
A tuyere 14 for blowing carbon powder without the smelting furnace is provided near the smelting furnace 10. Hot cyclone 34 for removing dust from exhaust gas of preheating pre-reduction furnace 30, heat exchanger for obtaining steam using sensible heat of exhaust gas of pre-heating pre-reduction furnace 30
35 are provided. Further, tuyeres 25 and 26 for blowing gas for stirring are provided on the side wall and the bottom of the smelting furnace 10, respectively. Considering the raw material situation, equipment cost, easiness of operation, etc., it is not possible to provide a shaft furnace type with good thermal efficiency or a rotary kiln type with reduced equipment cost and easy operation as the preheating pre-reduction furnace. There is no problem in implementing the present invention.
以上のように構成された本発明の方法に用いる溶融還
元装置の作用について説明する。原料である鉄鉱石は第
２のシュート31から予熱予備還元炉30に装入されここで
製錬炉10から導管33を通して発生ガスの供給を受けて予
熱、予備還元された後、製錬炉10に第３のシュート32を
通して装入される。副原料である石炭、造滓材は装入装
置が簡便である通常のホッパー（図示せず）から第１の
シュート13を通して製錬炉10内に装入される外、必要に
応じて粉状の原料、副原料を上記酸素ランスに設けたノ
ズル24から吹き込むことも可能である。上記のように製
錬炉に装入された原料及び副原料は製錬炉の側壁及び炉
底に設けられた羽口25、26から撹拌用ガスが吹き出さ
れ、既に炉内に形成されている鉄浴およびスラグ層とと
もに十分撹拌される。この撹拌用ガスは前記予熱予備還
元炉からの排ガスまたはAr、N2等の不活性ガスが用いら
れる。一方前記酸素ランス21の脱炭用及び２次燃焼用ノ
ズル22、23から供給される酸素は前記炭材を酸化させて
原料である鉄鉱石を還元するのに十分な熱源を供給す
る。The operation of the smelting reduction apparatus configured as described above and used in the method of the present invention will be described. Iron ore, which is a raw material, is charged from a second chute 31 into a preheating pre-reduction furnace 30, where it is supplied with generated gas from a smelting furnace 10 through a conduit 33 to be preheated and pre-reduced. Is charged through the third chute 32. Coal and slag-making materials as auxiliary raw materials are charged into the smelting furnace 10 through the first chute 13 from a normal hopper (not shown), which is simple in charging equipment, and powdery as required. It is also possible to blow the raw material and auxiliary raw material from the nozzle 24 provided in the oxygen lance. Raw materials and auxiliary raw materials charged into the smelting furnace as described above are agitated by blowing gas from the tuyeres 25 and 26 provided on the side walls and the furnace bottom of the smelting furnace, and are already formed in the furnace. Stir well with iron bath and slag layer. As the stirring gas, an exhaust gas from the preheating pre-reduction furnace or an inert gas such as Ar or N 2 is used. On the other hand, oxygen supplied from the decarburizing and secondary combustion nozzles 22 and 23 of the oxygen lance 21 supplies a heat source sufficient to oxidize the carbon material and reduce iron ore as a raw material.
炉口部に設けられた羽口14からは炭素粉が製錬炉内に
吹き込まれ、製錬炉内で酸素ランスからの酸素により高
ODかつ高温とされたガスと前記炭素粉とが次のように反
応する。CO2＋Ｃ＝2CO、H2O＋Ｃ＝H2＋CO2即ちCOガス及
びH2ガスが発生する。こうして改質され、ODが低減され
たガスが予熱予備還元炉30に導入されるので、前記予熱
予備還元炉30内における鉄鉱石の予備還元率が向上さ
れ、従って製錬炉10内での鉄鉱石の溶融還元は効率的に
行われる。上記の反応時に生じる吸熱により炉内のガス
が低温化し、炭素粉が冷却剤として作用するので、高温
による炉側壁の溶損が軽減されることになる。From the tuyere 14 provided at the furnace port, carbon powder is blown into the smelting furnace.
The OD and high temperature gas and the carbon powder react as follows. CO 2 + C = 2CO, H 2 O + C = H 2 + CO 2 That is, CO gas and H 2 gas are generated. Since the gas thus reformed and the OD is reduced is introduced into the preheating pre-reduction furnace 30, the pre-reduction rate of the iron ore in the pre-heating pre-reduction furnace 30 is improved, and thus the iron ore in the smelting furnace 10 is improved. The smelting reduction of stone is performed efficiently. Since the gas inside the furnace is cooled by the endotherm generated at the time of the above reaction and the carbon powder acts as a coolant, the melting loss of the furnace side wall due to the high temperature is reduced.
また、予熱予備還元炉30からの排ガスはホットサイク
ロン34でダストが除去された後、蒸気発生器35で熱交換
されて系外に排出されるが、必要に応じて切り換え弁36
により製錬炉10の撹拌用ガスとして利用される。なお、
前記蒸気発生器35に代えて鉄鉱石予熱装置を設けて予熱
予備還元炉30の排ガスの顕熱を利用することも可能であ
る。The exhaust gas from the preheating pre-reduction furnace 30 is subjected to heat exchange in a steam generator 35 after the dust is removed in a hot cyclone 34 and discharged outside the system.
Is used as a stirring gas for the smelting furnace 10. In addition,
It is also possible to provide an iron ore preheating device in place of the steam generator 35 and use the sensible heat of the exhaust gas of the preheating pre-reduction furnace 30.
次にこの発明の方法により、鉄鉱石を溶融還元した場
合の容量50トンの製錬炉での具体例をガス改質しない場
合とガス改質した場合との比較を第１表に示す。なお、
いずれの場合も溶銃の生成速度は28トン／時である。Next, Table 1 shows a comparison of a specific example in a smelting furnace with a capacity of 50 tons in a case where iron ore is smelted and reduced by the method of the present invention in a case where no gas reforming is performed and a case where gas reforming is performed. In addition,
In each case, the production rate of the gun is 28 tons / hour.
第１表に示すように、ガス改質を実施した場合にはガ
ス改質を実施しない場合に比べて排ガスはODが低くな
り、排ガスの温度は低下していることがわかる。 As shown in Table 1, when the gas reforming is performed, the OD of the exhaust gas is lower than when the gas reforming is not performed, and the temperature of the exhaust gas is lower.
［発明の効果］ 本発明によれば、製錬炉の発生ガスは炉口付近から吹
き込まれる粉状の炭材と反応して改質された後に予熱予
備還元炉に導入されるので、予熱予備還元炉内の予備還
元率が向上し、更に、発生ガスと粉状の炭材との反応時
における吸熱により、発生ガスの温度が低下するので、
炉口付近の炉内耐火物の溶損が低減する。[Effects of the Invention] According to the present invention, the gas generated in the smelting furnace is introduced into the preheating pre-reduction furnace after being reformed by reacting with the powdery carbon material blown from the vicinity of the furnace port. Since the pre-reduction rate in the reduction furnace is improved, and the temperature of the generated gas decreases due to heat absorption during the reaction between the generated gas and the powdery carbon material,
Melting damage of refractories in the furnace near the furnace opening is reduced.
第１図は本発明の溶融還元法に用いられるプロセスの説
明図である。 10……製錬炉、11……鉄浴、12……スラグ層、13……第
１のシュート、14……粉炭吹込用羽口、21……酸素ラン
ス、22、23、24……ノズル、25、26……撹拌ガス用羽
口、30……予熱予備還元炉、21……第２のシュート、32
……第３のシュート、33……導管、34……ホツトサイク
ロン、35……蒸気発生器。FIG. 1 is an explanatory view of a process used in the smelting reduction method of the present invention. 10 ... smelting furnace, 11 ... iron bath, 12 ... slag layer, 13 ... first chute, 14 ... tuyere for pulverized coal injection, 21 ... oxygen lance, 22, 23, 24 ... nozzle , 25, 26 ... tuyere for stirring gas, 30 ... preheating pre-reduction furnace, 21 ... second chute, 32
... Third chute, 33, conduit, 34, hot cyclone, 35, steam generator.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川上 正弘 東京都千代田区丸ノ内１丁目１番２号 日本鋼管株式会社内 (72)発明者 山田 健三 東京都千代田区丸ノ内１丁目１番２号 日本鋼管株式会社内 審査官 津野 孝 (56)参考文献 特開 昭61−64807（ＪＰ，Ａ) 特開 平１−96314（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Masahiro Kawakami 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Kenzo Yamada 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Examiner Takashi Tsuno, Inc. (56) References JP-A-61-64807 (JP, A) JP-A-1-96314 (JP, A)
Claims (5)
する予熱予備還元炉にて予熱予備還元された鉄鉱石を予
熱予備還元炉から製錬炉に装入するとともに、炭材と造
滓剤とを製錬炉に装入し、脱炭用及び２次燃焼用ノズル
を有する上吹き酸素ランスから酸素を製錬炉に吹き込
み、同時に、製錬炉の側壁及び炉底に設けられた羽口か
ら撹拌用ガスを吹き込んで鉄鉱石を溶融還元する方法で
あって、炉頂付近に設けられた羽口より粉状の炭材を炉
内ガス中に吹き込み、上記２次燃焼用ノズルからの酸素
により燃焼して酸化度〔（H2O＋CO2）／（H2＋H2O＋CO
＋CO2）〕が高くかつ高温となった炉内ガスと粉状の炭
材とを反応させ、酸化度を低くさせた改質ガスを定常的
に得ることを特徴とする溶融還元法。An iron ore that has been preheated and reduced in a preheating prereduction furnace for introducing a gas generated in a smelting furnace as a reducing gas is charged into the smelting furnace from the preheating prereduction furnace, and a carbon material and a smelting furnace are produced. The slag was charged into the smelting furnace, and oxygen was blown into the smelting furnace from a top-blown oxygen lance having decarburizing and secondary combustion nozzles. At the same time, oxygen was provided on the side wall and the furnace bottom of the smelting furnace. This is a method of melting and reducing iron ore by blowing a gas for stirring from tuyeres. A powdery carbonaceous material is blown into the gas in the furnace from a tuyere provided near the furnace top, and is then discharged from the secondary combustion nozzle. oxygen oxidation degree burns by the [(H 2 O + CO 2) / (H 2 + H 2 O + CO
+ CO 2 )] The smelting reduction method characterized by reacting a furnace gas having a high temperature and a high temperature with a powdery carbonaceous material to constantly obtain a reformed gas having a low oxidation degree.
であることを特徴とする特許請求の範囲第１項に記載の
溶融還元法。2. The smelting reduction method according to claim 1, wherein said preheating pre-reduction furnace is a fluidized bed type reactor.
装置であることを特徴とする特許請求の範囲第１項に記
載の溶融還元法。3. The smelting reduction method according to claim 1, wherein said preheating pre-reduction furnace is a shaft furnace type reactor.
の反応装置であることを特徴とする特許請求の範囲第１
項に記載の溶融還元法。4. The apparatus according to claim 1, wherein said preheating pre-reduction furnace is a rotary kiln type reactor.
The smelting reduction method according to the item.
鉄鉱石予熱装置で鉄鉱石を予熱することを特徴とする特
許請求の範囲第１項乃至第４項の何れか１に記載の溶融
還元法。5. The melting according to claim 1, wherein the iron ore is preheated by an iron ore preheating device using an outlet gas of the preheating pre-reduction furnace. Reduction method.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62303940A JP2638861B2 (en) | 1987-11-30 | 1987-11-30 | Melt reduction method |
| AU24916/88A AU608091C (en) | 1987-11-30 | 1988-11-08 | Method for smelting reduction of iron ore and apparatus therefor |
| CA000584123A CA1337241C (en) | 1987-11-30 | 1988-11-25 | Method for smelting reduction of iron ore and apparatus therefor |
| EP88119803A EP0318896B1 (en) | 1987-11-30 | 1988-11-28 | Method for smelting reduction of iron ore and apparatus therefor |
| DE3887838T DE3887838T2 (en) | 1987-11-30 | 1988-11-28 | Method and device for smelting reduction of iron ores. |
| AT88119803T ATE101655T1 (en) | 1987-11-30 | 1988-11-28 | METHOD AND DEVICE FOR SMELTING REDUCTION OF IRON ORES. |
| US07/276,612 US5000784A (en) | 1987-11-30 | 1988-11-28 | Method for smelting reduction of iron ore |
| BR888806278A BR8806278A (en) | 1987-11-30 | 1988-11-29 | METHOD AND APPLIANCE FOR REDUCING AND SPINDLE OF IRON ORE |
| CN 88108145 CN1019669B (en) | 1987-11-30 | 1988-11-29 | Process and apparatus for reduction of molten iron ore |
| KR1019880015891A KR910006037B1 (en) | 1987-11-30 | 1988-11-30 | Method for smelting reduction of iron ore |
| US07/520,785 US5065985A (en) | 1987-11-30 | 1990-05-08 | Method for smelting reduction of iron ore and apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62303940A JP2638861B2 (en) | 1987-11-30 | 1987-11-30 | Melt reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01147009A JPH01147009A (en) | 1989-06-08 |
| JP2638861B2 true JP2638861B2 (en) | 1997-08-06 |
Family
ID=17927118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62303940A Expired - Lifetime JP2638861B2 (en) | 1987-11-30 | 1987-11-30 | Melt reduction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2638861B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2768775B2 (en) * | 1989-09-04 | 1998-06-25 | 新日本製鐵株式会社 | Metal smelting reduction method and smelting reduction furnace |
| JP2536211B2 (en) * | 1990-02-02 | 1996-09-18 | 日本鋼管株式会社 | Iron ore discharge pipe blockage prevention device for preliminary reduction furnace in melting source equipment |
| KR100327848B1 (en) * | 1996-11-11 | 2002-08-19 | 스미토모 긴조쿠 고교 가부시키가이샤 | Manufacturing method and apparatus of reduced iron |
| TW368521B (en) * | 1996-11-20 | 1999-09-01 | Sumitomo Metal Ind | Manufacturing method and apparatus for deoxidized iron |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164807A (en) * | 1984-09-03 | 1986-04-03 | Nippon Steel Corp | Melt reduction method of iron ore |
-
1987
- 1987-11-30 JP JP62303940A patent/JP2638861B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01147009A (en) | 1989-06-08 |
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