JP2600732B2 - Smelting reduction method and equipment - Google Patents
Smelting reduction method and equipmentInfo
- Publication number
- JP2600732B2 JP2600732B2 JP62322321A JP32232187A JP2600732B2 JP 2600732 B2 JP2600732 B2 JP 2600732B2 JP 62322321 A JP62322321 A JP 62322321A JP 32232187 A JP32232187 A JP 32232187A JP 2600732 B2 JP2600732 B2 JP 2600732B2
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- JP
- Japan
- Prior art keywords
- ore
- smelting furnace
- furnace
- smelting
- preheating device
- 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.)
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- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
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材として用い、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
元法及び装置に関する。Description: TECHNICAL FIELD The present invention relates to a smelting reduction method and apparatus 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、高炉製銑法に変わるものであり、高炉
製銑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銑法の欠点を解消しまた鉄の他、
クロム、マンガン、ニッケルの鉱石を直接還元すること
ができるものとして近年に至り開発されたものである。[Conventional technology] The smelting reduction method is an alternative to the blast furnace iron making method. The blast furnace iron making method eliminates the disadvantages of the blast furnace iron making method, which requires a large blast furnace construction cost and requires a large site. Other than iron
It has been developed in recent years as a material capable of directly reducing ore of chromium, manganese, and nickel.
この還元法においては、予備還元炉を設け鉱石を製錬
炉からの排出ガスで予備還元して炭材、造滓材とともに
洗練炉内に装入し、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。そうすると炭材が、予め装
入されてある溶銑に溶解するとともに、炭材及び溶鉄中
のＣが前記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
および溶銑のＣによって還元される。溶銑から発生する
COガスは前記酸素ガスにより２次燃焼されてCO2ガスに
なる。このCO2ガスの顕熱は、溶銑上を覆っているスラ
グ及びフオーミング状の粒鉄に伝達され、次いで溶銑に
伝達される。こうして鉄鉱石が還元されて溶銑が製造さ
れるが、製錬炉における鉄鉱石の還元工程を軽減するた
め、予備還元炉を設け製錬炉に装入される前の鉄鉱石の
予備還元率を高くして60％乃至75％とするので、製錬炉
の排出ガスとして還元性の高い低酸化度のガスを多量に
必要としている。（例えば特公昭61−43406） ［発明が解決しようとする問題点］ しかしながら、予備還元率を30％以上にする場合に
は、製錬炉の排出ガスの酸化度を下げる必要がある。こ
うすると前記排出ガス量は必然的に増加することにな
り、前記製錬炉の発生エネルギーは1Gcal/T（溶銑）を
大きく超える事になり、製造所のエネルギーバランス
上、発生エネルギーが過剰になる。このことは当然製造
コストの増大につながる。In this reduction method, a pre-reduction furnace is provided, and the ore is pre-reduced with the exhaust gas from the smelting furnace and charged into the refining furnace together with the carbonaceous material and the slag-making material. It is blown into the smelting furnace. Then, the carbon material dissolves in the hot metal charged in advance, and C in the carbon material and the molten iron is oxidized by the oxygen gas. The ore is melted by the heat of oxidation at this time, and the ore is reduced by C in the carbon material and C of the hot metal. Generated from hot metal
The CO gas is secondarily burned by the oxygen gas to become CO 2 gas. The sensible heat of the CO 2 gas is transferred to the slag and forming granular iron covering the hot metal, and then to the hot metal. In this way, iron ore is reduced to produce hot metal.However, in order to reduce the iron ore reduction process in the smelting furnace, a pre-reduction furnace is provided to reduce the pre-reduction rate of the iron ore before being charged into the smelting furnace. Since it is increased to 60% to 75%, a large amount of low-oxidizing gas with high reducibility is required as the exhaust gas of the smelting furnace. (For example, Japanese Patent Publication No. 61-43406) [Problems to be Solved by the Invention] However, when the preliminary reduction rate is set to 30% or more, it is necessary to reduce the degree of oxidation of the exhaust gas from the smelting furnace. In this case, the amount of exhaust gas inevitably increases, the generated energy of the smelting furnace greatly exceeds 1 Gcal / T (hot metal), and the generated energy becomes excessive due to the energy balance of the factory. . This naturally leads to an increase in manufacturing costs.
また、流動層型、シャフト炉型、またはロータリーキ
ルン型の何れにしても予備還元炉を設置する場合は溶融
還元装置の設備費は従来の高炉に匹敵するものとなり、
溶融還元装置設置のメリットが失われる虞がある。更に
従来の30％を超える予備還元率が得られる予備還元炉を
設けた溶融還元装置では、鉱石の滞留時間、前記排ガス
の酸化度、製錬炉からの出湯等を調整しなければならな
いので、操業の自由度が大幅に制限される。In addition, if a preliminary reduction furnace is installed in any of a fluidized bed type, a shaft furnace type, and a rotary kiln type, the equipment cost of the smelting reduction device will be comparable to that of a conventional blast furnace,
There is a possibility that the merit of installing the smelting reduction device may be lost. Furthermore, in a smelting reduction apparatus provided with a pre-reduction furnace capable of obtaining a pre-reduction rate exceeding 30% of the conventional one, the residence time of the ore, the degree of oxidation of the exhaust gas, the tapping from the smelting furnace, and the like must be adjusted. Operational flexibility is greatly limited.
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、前記製錬炉からの発生エネルギーを抑
え、溶融還元装置の設備費を低減し、省エネルギー型で
低コストの溶融還元法及び装置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 problems, and suppresses the energy generated from the smelting furnace, reduces the equipment cost of the smelting reduction apparatus, an energy saving type and low cost smelting reduction method, and It is intended to provide a device.
［問題点を解決するための手段及び作用］ 本発明による溶融還元は、鉱石予熱装置により予熱、
予備還元された鉱石を鉱石予熱装置から製錬炉に直接装
入するとともに、炭材と造滓材とを製錬炉に装入し、上
吹き酸素ランスから酸素を吹き込み、同時に、製錬炉の
側壁または炉底に設けられた羽口から撹拌用ガスを吹き
込んで鉱石を溶融還元する方法であって、前記製錬炉で
生成され前記鉱石予熱装置に導入されるガスの温度を30
0℃乃至1300℃、前記ガスの酸化度〔（H2O＋CO2）／（H
2＋H2O＋CO＋CO2）〕を0.6を超え0.9以下、予熱装置に
おける予備還元率を15％以下とすることを特徴とする。[Means and Actions for Solving the Problems] The smelting reduction according to the present invention comprises preheating by an ore preheating device,
The prereduced ore is charged directly from the ore preheating device into the smelting furnace, and the carbonaceous material and slag-making material are charged into the smelting furnace, and oxygen is blown from the top-blown oxygen lance. A method for smelting and reducing ore by blowing a stirring gas from a tuyere provided at a side wall or a furnace bottom of the furnace, wherein the temperature of the gas generated in the smelting furnace and introduced into the ore preheating device is adjusted to 30.
0 ° C. to 1300 ° C., the degree of oxidation of the gas [(H 2 O + CO 2 ) / (H
2 + H 2 O + CO + CO 2 )] is more than 0.6 and 0.9 or less, and the pre-reduction ratio in the preheating device is 15% or less.
また、本発明による溶融還元装置は、側壁及び炉底に
羽口を有した製錬炉と、製錬炉内を鉛直方向に装入され
る上吹き酸素ランスとからなり、鉱石、炭材及び造滓材
を製錬炉に装入し、上吹き酸素ランスから酸素を吹き込
むとともに、前記羽口から撹拌用ガスを吹き込んで鉱石
を溶融還元する装置であって、前記製錬炉からの高温排
ガスにより鉱石を予熱する鉱石予熱装置を具備し、該鉱
石予熱装置が浮遊式熱交換機であることを特徴とする。Further, the smelting reduction apparatus according to the present invention comprises a smelting furnace having tuyeres on the side walls and the furnace bottom, and an upper-blown oxygen lance charged vertically in the smelting furnace. A device for charging a slag-making material into a smelting furnace, blowing oxygen from a top-blown oxygen lance, and melting and reducing ore by blowing a stirring gas from the tuyeres, wherein high-temperature exhaust gas from the smelting furnace is used. And an ore preheating device for preheating the ore according to (1), wherein the ore preheating device is a floating heat exchanger.
［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。転炉型の製錬炉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が夫々設けられ、更に
ランス先端の中心には主に炭材または石炭等の副原料を
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。さらに前記炉の上方に
は浮遊式熱交換機（Suspension Preheater、以下これを
単にSPという）が、鉱石予熱装置30として設置されてい
る。これにより原料である鉄鉱石が予熱、予備還元され
る。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. An iron bath 11 and a slag layer 12 are formed in a converter-type smelting furnace 10, and a first chute 13 into which coal and slag-making material as auxiliary raw materials are charged is provided at an upper portion of the furnace. An oxygen lance 21 for blowing oxygen is inserted vertically into the furnace. The lance is provided with nozzles 22 and 23 for ejecting oxygen for decarburization and oxygen for secondary combustion, respectively. Further, at the center of the tip of the lance, there is provided a dedicated nozzle 24 for mainly injecting auxiliary material such as carbon material or coal. Is 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. Further, a floating heat exchanger (hereinafter simply referred to as SP) is installed as an ore preheating device 30 above the furnace. As a result, the iron ore as the raw material is preheated and preliminarily reduced.
SPはサイクロン、熱交換ダクト及び案内管を有するユ
ニットが多段、直列に重ねられて構成されており、例え
ば第１図の第１のユニット１について説明すると31が第
１のサイクロン、32が第１の熱交換ダクト、33が第１の
案内管である。本実施例のSPでは前記ユニットが３段で
構成されているが、この段数は原料事情、操業条件によ
り決められるものである。最上段である第３のユニット
３の熱交換ダクトには特に図示しない通常の原料供給装
置から粗粒または微粒の鉄鉱石が供給される第２のシュ
ート45が設けられている。The SP is composed of units having a cyclone, a heat exchange duct, and a guide tube, which are stacked in multiple stages and in series. For example, when the first unit 1 in FIG. 1 is described, 31 is the first cyclone, and 32 is the first cyclone. The heat exchange duct 33 is a first guide tube. In the SP of this embodiment, the unit is composed of three stages, but the number of stages is determined by raw material circumstances and operating conditions. A second chute 45 to which coarse or fine iron ore is supplied from an ordinary raw material supply device (not shown) is provided in the heat exchange duct of the third unit 3 at the uppermost stage.
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。主として塊状または粗
粒の原料、副原料は第１のシュート13から、主として微
粒または粉状の原料、副原料はキャリアーガスとともに
酸素ランスのノズル24及び羽口25、26から製錬炉に装入
される。SPで予熱される鉄鉱石は第２のシュート45から
装入されるが、この粒度はSP能力によって決められる。The operation of the smelting reduction apparatus configured as described above and used in the method of the present invention will be described. Raw material, mainly bulky or coarse, raw material is charged into the smelting furnace from the first chute 13, mainly fine or powdery raw material, and raw material is supplied to the smelting furnace from the oxygen lance nozzle 24 and tuyeres 25, 26 together with carrier gas. Is done. The iron ore preheated by the SP is charged from the second chute 45, the size of which is determined by the SP capacity.
製錬炉からの排ガスは第１の熱交換ダクト32に導入さ
れ、上段のユニットに設けられた第２の案内管37から降
下される前記鉄鉱石と熱交換された後、第１のサクロン
31に入りここで鉄鉱石が分離されて第２の熱交換ダクト
36に導入される。以下同様にして前記排ガスは第２、第
３のユニット２、３の熱交換ダクト36、40、サイクロン
35、39を通って排出される。一方、第２のシュート45か
らSPに装入された鉄鉱石は最上段の第３の熱交換ダクト
40で前記排ガスと向流して浮遊状態で熱交換された後、
相対的に軽いものは第３のサイクロン39、同様に重いも
のは下段の第２のサイクロン35に入り排ガスと分離され
て夫々第３、第２の案内管41、37を下降して下段の熱交
換ダクト36、32に入る。こうして鉄鉱石は予熱、還元さ
れて最終的に熱交換ダクト32もしくは案内管33を通って
何れも製錬炉10に装入される。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から吹き出される攪拌用ガスにより、
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。この攪拌用ガスは前記SPからの排ガス
およびAr、N2等の不活性ガスが用いられる。また前記攪
拌ガスはキャリアーガスとして混合機27で前記原料、副
原料とともに加圧、混合されて羽口25、26または酸素ラ
ンスのノズル24から吹き出すことも出来る。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素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。Exhaust gas from the smelting furnace is introduced into a first heat exchange duct 32 and exchanges heat with the iron ore dropped from a second guide pipe 37 provided in an upper unit.
Enter iron 31 where iron ore is separated and the second heat exchange duct
Introduced in 36. Similarly, the exhaust gas is supplied to the heat exchange ducts 36 and 40 of the second and third units 2 and 3,
Discharged through 35, 39. On the other hand, the iron ore charged to the SP from the second chute 45 is the third heat exchange duct at the top.
After heat exchange in a floating state by countercurrent to the exhaust gas at 40,
The relatively light one enters the third cyclone 39, and the heavy one enters the lower second cyclone 35 and is separated from the exhaust gas, and descends the third and second guide pipes 41 and 37 respectively to lower the heat of the lower one. Enter the exchange ducts 36 and 32. In this way, the iron ore is preheated and reduced, and is finally charged into the smelting furnace 10 through the heat exchange duct 32 or the guide pipe 33. The raw materials and auxiliary materials charged into the smelting furnace as described above are stirred gas blown out from the tuyeres 25 and 26 provided on the side walls and the bottom of the smelting furnace,
It is sufficiently stirred with the iron bath and slag layer already formed in the furnace. As the stirring gas, the exhaust gas from the SP and an inert gas such as Ar and N 2 are used. Further, the stirring gas may be pressurized and mixed together with the raw material and the auxiliary raw material by a mixer 27 as a carrier gas and blown out from the tuyere 25, 26 or the nozzle 24 of the oxygen lance. On the other hand, oxygen supplied from the decarburization and secondary combustion nozzles 22 and 23 of the oxygen lance 21 supplies a heat source sufficient to oxygenate the carbon material and reduce iron ore as a raw material.
ここで本発明の特徴は上記製錬炉10の上方に鉱石予熱
装置30としてSPを設けて、製錬炉10の排ガスにより鉱石
の予熱予備還元を行い、このときの製錬炉の排ガスの酸
化度（OD）を0.6を超え0.9以下、その温度を300゜乃至1
300℃、予熱予備還元炉における鉄鉱石の予備還元率を1
5％以下とすることを特徴とするものであるが、以下に
その理由を説明する。Here, the feature of the present invention is that an SP is provided as an ore preheating device 30 above the smelting furnace 10, and the ore is preheated and reduced by the exhaust gas of the smelting furnace 10, and the oxidation of the exhaust gas of the smelting furnace at this time is performed. Degree (OD) of more than 0.6 and less than 0.9.
The pre-reduction rate of iron ore in the pre-heating pre-reduction furnace at 300 ° C is 1
It is characterized by being 5% or less, and the reason will be described below.
第２図は前記酸化度（OD）と第１図の溶融還元装置か
ら発生する余剰エネルギーとの関係を示したグラフ図で
ある。第２図の図中、斜線で示した範囲が製鉄所全体の
エネルギーバランスを考えたときの適正な余剰エネルギ
ーの範囲で、実線は揮発分の低い炭材、破線は前記揮発
分の高い炭材に関するものである。夫々の線に付された
数字は対応する予備還元率である。この図は前記溶融還
元装置について検討した結果得られたもので、これによ
ればODが0.6以下の場合は余剰エネルギーは多過ぎて無
駄なエネルギーが発生することになり、ODが0.9より大
きい場合は余剰エネルギーは少な過ぎて製鉄所のエネル
ギーは不足する。ただし、炭材の揮発分が40％以上で発
熱量が7000kcal/kg未満である場合、または鉄鉱石中の
脈石分が５％以上の場合には炭材原単位を増加させるこ
とになるので、OD比は0.8乃至1.0である方が望ましい場
合も考えられる。このことは第２図に示されているよう
に前記予備還元率を15％以下としたときに達成されるの
であって、これを15％より多くすることは前述の通り鉄
鉱石の予熱予備還元炉の滞留時間が長くなり、溶融還元
装置の操業の自由度が大きく制限されることになる。FIG. 2 is a graph showing the relationship between the degree of oxidation (OD) and excess energy generated from the smelting reduction device of FIG. In FIG. 2, the hatched area indicates the range of appropriate surplus energy when considering the energy balance of the entire steelworks. The solid line indicates the low-volatile carbon material, and the broken line indicates the high-volatile carbon material. It is about. The number attached to each line is the corresponding reserve rate. This figure is obtained as a result of examining the smelting reduction apparatus.According to this figure, when OD is 0.6 or less, excess energy is excessive and wasteful energy is generated, and when OD is greater than 0.9. Means that the surplus energy is too small and the energy of the steelworks is insufficient. However, if the volatile matter of the carbonaceous material is 40% or more and the calorific value is less than 7000 kcal / kg, or if the gangue content in the iron ore is 5% or more, the carbonaceous unit intensity will be increased. In some cases, it is desirable that the OD ratio be 0.8 to 1.0. This is achieved when the pre-reduction rate is set to 15% or less as shown in FIG. 2. Increasing the pre-reduction rate to more than 15% requires the preheating pre-reduction of iron ore as described above. The residence time of the furnace is prolonged, and the degree of freedom of operation of the smelting reduction apparatus is greatly restricted.
また従来の予備還元炉を設けた溶融還元装置では鉱石
の滞留時間、排ガスのOD、製錬炉からの出湯等を調整し
なければならないので、操業の自由度が大幅に制限され
ていたが、本発明においては此等の問題を解決しあわせ
て設備費の低減を目的として特に予備還元装置を設け
ず、鉱石予熱装置を設けたものである。これは製錬炉内
で発生するCOガスを極力２次燃焼させ、この熱源を製錬
炉内の鉱石の脱炭、還元に使うという考え方にもとづく
ものである。この考え方に従って本発明の特徴を説明す
るとODが0.6以下では排ガスの温度が十分上らず、0.9以
上では２次燃焼効率向上のため設備費、操業費ともに著
しく増大する。また排ガス温度については300℃以下で
は鉱石の予熱が不十分で、1300℃以上では鉱石予熱装置
の耐火性及び鉄鉱石粒子の焼結反応が問題になる。前記
鉱石予熱装置の還元率はOD及び温度が上記の範囲で通常
の妥当な操業条件のもとでは15％を超えることはない。In addition, in the conventional smelting reduction apparatus equipped with a preliminary reduction furnace, the ore residence time, OD of exhaust gas, tapping from the smelting furnace, etc. had to be adjusted, so the degree of freedom of operation was greatly limited, In the present invention, in order to solve these problems and reduce the equipment cost, an ore preheating device is provided without providing a preliminary reduction device. This is based on the idea that CO gas generated in the smelting furnace is subjected to secondary combustion as much as possible, and this heat source is used for decarburization and reduction of ore in the smelting furnace. Explaining the features of the present invention according to this concept, when the OD is 0.6 or less, the temperature of the exhaust gas does not rise sufficiently, and when the OD is 0.9 or more, both the facility cost and the operating cost increase remarkably to improve the secondary combustion efficiency. When the exhaust gas temperature is lower than 300 ° C., the preheating of the ore is insufficient, and when it is higher than 1300 ° C., the fire resistance of the ore preheating device and the sintering reaction of iron ore particles become problems. The reduction rate of the ore preheating device does not exceed 15% under normal and reasonable operating conditions in the above range of OD and temperature.
［発明の効果］ 本発明によれば従来の予備還元炉を設けず、攪拌ガス
で鉄浴及びスラグ層を攪拌し、製錬炉に吹き込まれた酸
素ガスにより製錬炉で発生するCOガスを極力２次燃焼さ
せて排ガスの温度を上げ、この排ガスを用いて鉱石予熱
装置で鉱石の予熱、予備還元を行うので、製錬炉の熱効
率が向上するとともに溶融還元装置の余剰エネルギーが
製鉄所全体のエネルギーバランスに見合った適正のもの
となり、また溶融還元装置の設備費が低減され、操業の
自由度が大幅に改善される。[Effects of the Invention] According to the present invention, the iron bath and the slag layer are stirred with a stirring gas without providing a conventional pre-reduction furnace, and CO gas generated in the smelting furnace by oxygen gas blown into the smelting furnace. The exhaust gas temperature is raised by secondary combustion as much as possible, and the ore is preheated and pre-reduced by the ore preheating device using this exhaust gas, so the thermal efficiency of the smelting furnace is improved and the surplus energy of the smelting reduction device is used throughout the steel mill. Therefore, the smelting reduction equipment costs are reduced and the degree of freedom of operation is greatly improved.
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、第２図は本発明による排ガスの酸化度（OD）と余
剰エネルギーとの関係を示すグラフ図である。 １、２、３……SPのユニット、10……製錬炉、11……鉄
浴、12……スラグ層、13……第１のシュート、21……酸
素ランス、22、23、24……ノズル、25、26……羽口、30
……鉱石予熱装置、31、35、39……サイクロン、32、3
6、40……熱交換ダクト、33、37、41……案内管、45…
…第２のシュート。FIG. 1 is an explanatory diagram of a process used in the smelting reduction method of the present invention, and FIG. 2 is a graph showing the relationship between the degree of oxidation (OD) of exhaust gas and excess energy according to the present invention. 1, 2, 3 ... SP unit, 10 ... smelting furnace, 11 ... iron bath, 12 ... slag layer, 13 ... first chute, 21 ... oxygen lance, 22, 23, 24 ... … Nozzle, 25, 26 …… Tuyere, 30
…… Ore preheater, 31, 35, 39 …… Cyclone, 32, 3
6, 40 ... heat exchange duct, 33, 37, 41 ... guide tube, 45 ...
... second shot.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川上 正弘 東京都千代田区丸の内１丁目１番２号 日本鋼管株式会社内 (72)発明者 寺田 修 東京都千代田区丸の内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 平１−162711（ＪＰ，Ａ) 特開 昭61−64807（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiro Kawakami 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Osamu Terada 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Examiner Takashi Tsuno, Inc. (56) References JP-A-1-162711 (JP, A) JP-A-61-64807 (JP, A)
Claims (4)
鉱石を鉱石予熱装置から製錬炉に直接挿入するととも
に、炭材と造滓材とを製錬炉に装入し、上吹き酸素ラン
スから酸素を吹き込み、同時に、製錬炉の側壁または炉
底に設けられた羽口から撹拌用ガスを吹き込んで鉱石を
溶融還元する方法であって、前記製錬炉で生成され前記
鉱石予熱装置に導入されるガスの温度を300℃乃至1300
℃、前記ガスの酸化度〔（H2O＋CO2）／（H2＋H2O＋CO
＋CO2）〕を0.6を超え0.9以下、予熱装置における予備
還元率を15％以下とすることを特徴とする溶融還元法。An ore preheated and pre-reduced by an ore preheating device is directly inserted into the smelting furnace from the ore preheating device, and a carbon material and a slag-making material are charged into the smelting furnace, and the top-blown oxygen lance is provided. A method of blowing and stirring oxygen from a tuyere provided at the side wall or the bottom of the smelting furnace to melt and reduce the ore, wherein the ore is generated in the smelting furnace and is supplied to the ore preheating device. The temperature of the gas introduced is 300 ° C to 1300
° C, degree of oxidation of the gas [(H 2 O + CO 2 ) / (H 2 + H 2 O + CO
+ CO 2 )] is more than 0.6 and 0.9 or less, and the pre-reduction ratio in the preheating device is 15% or less.
ンスに設けられた専用のノズルまたは前記羽口から製錬
炉内に吹き込む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. A smelting furnace according to claim 1, wherein said powdery ore, carbonaceous material or slag-making material is blown into a smelting furnace from a dedicated nozzle provided in an oxygen lance or said tuyere. The smelting reduction method according to 1.
前記炉内に投入することを特徴とする特許請求の範囲第
１項及び第２項の何れか１項に記載の溶融還元法。3. The smelting reduction method according to claim 1, wherein the massive carbon material is introduced into the furnace by gravity drop from above the smelting furnace. .
錬炉内を鉛直方向に挿入される上吹き酸素ランスとから
なり、鉱石、炭材及び造滓材を製錬炉に装入し、上吹き
酸素ランスから酸素を吹き込むとともに、前記羽口から
撹拌用ガスを吹き込んで鉱石を溶融還元する装置であっ
て、前記製錬炉からの高温排ガスにより鉱石を予熱する
鉱石予熱装置を具備し、該鉱石予熱装置が浮遊式熱交換
機であることを特徴とする溶融還元装置。4. A smelting furnace having tuyeres at side walls and a furnace bottom, and an upper-blown oxygen lance inserted vertically in the smelting furnace to smelt ore, carbonaceous material and slag-making material. An ore that is charged into a furnace, blows oxygen from a top-blown oxygen lance, and melts ore by blowing a gas for stirring from the tuyere, wherein the ore is preheated by high-temperature exhaust gas from the smelting furnace. A smelting reduction device comprising a preheating device, wherein the ore preheating device is a floating heat exchanger.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322321A JP2600732B2 (en) | 1987-12-18 | 1987-12-18 | Smelting reduction method and equipment |
| US07/283,218 US4995906A (en) | 1987-12-18 | 1988-12-12 | Method for smelting reduction of iron ore |
| AU26831/88A AU604589C (en) | 1987-12-18 | 1988-12-13 | Method for smelting reduction of iron ore and apparatus therefor |
| BR888806668A BR8806668A (en) | 1987-12-18 | 1988-12-16 | PROCESS AND APPARATUS FOR REDUCING IRON ORE BY FOUNDATION |
| CA000586081A CA1336744C (en) | 1987-12-18 | 1988-12-16 | Method for smelting reduction of iron ore and apparatus therefor |
| CN 88108700 CN1014432B (en) | 1987-12-18 | 1988-12-17 | Process and apparatus for smelting and rducing iron ores |
| KR1019880016851A KR910008142B1 (en) | 1987-12-18 | 1988-12-17 | Method for smelting reduction of iron ore |
| EP88121236A EP0320999B1 (en) | 1987-12-18 | 1988-12-19 | Method for smelting reduction of iron ore and apparatus therefor |
| DE3888803T DE3888803T2 (en) | 1987-12-18 | 1988-12-19 | Method and device for smelting reduction of iron ores. |
| AT88121236T ATE103638T1 (en) | 1987-12-18 | 1988-12-19 | METHOD AND DEVICE FOR SMELTING REDUCTION OF IRON ORES. |
| US07/599,679 US5074530A (en) | 1987-12-18 | 1990-10-17 | Apparatus for smelting reduction of iron ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322321A JP2600732B2 (en) | 1987-12-18 | 1987-12-18 | Smelting reduction method and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01162710A JPH01162710A (en) | 1989-06-27 |
| JP2600732B2 true JP2600732B2 (en) | 1997-04-16 |
Family
ID=18142329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62322321A Expired - Fee Related JP2600732B2 (en) | 1987-12-18 | 1987-12-18 | Smelting reduction method and equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2600732B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101406622B1 (en) * | 2012-12-21 | 2014-06-12 | 주식회사 포스코 | Method for recycling iron-bearing byproduct and device used for the same |
| CN103954728B (en) * | 2014-03-24 | 2015-10-28 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Coke reactivity determinator is utilized to simulate the test method of iron ore direct reducing |
| CN105803147B (en) * | 2016-04-06 | 2017-12-05 | 安徽工业大学 | A kind of method using pneumatic steelmaking system melt reducing iron ore |
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
- 1987-12-18 JP JP62322321A patent/JP2600732B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01162710A (en) | 1989-06-27 |
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