JP2596003B2 - Smelting reduction method - Google Patents
Smelting reduction methodInfo
- Publication number
- JP2596003B2 JP2596003B2 JP62260606A JP26060687A JP2596003B2 JP 2596003 B2 JP2596003 B2 JP 2596003B2 JP 62260606 A JP62260606 A JP 62260606A JP 26060687 A JP26060687 A JP 26060687A JP 2596003 B2 JP2596003 B2 JP 2596003B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- smelting
- furnace
- gas
- coal
- 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 - Fee Related
Links
- 238000003723 Smelting Methods 0.000 title claims description 47
- 238000000034 method Methods 0.000 title claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 47
- 239000002893 slag Substances 0.000 claims description 34
- 239000007789 gas Substances 0.000 claims description 25
- 229910052742 iron Inorganic materials 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 239000003245 coal Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000003575 carbonaceous material Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000005261 decarburization Methods 0.000 claims description 4
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- 239000010459 dolomite Substances 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000012159 carrier gas Substances 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000006722 reduction reaction Methods 0.000 description 25
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000011822 basic refractory Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- ZPUCINDJVBIVPJ-LJISPDSOSA-N cocaine Chemical compound O([C@H]1C[C@@H]2CC[C@@H](N2C)[C@H]1C(=O)OC)C(=O)C1=CC=CC=C1 ZPUCINDJVBIVPJ-LJISPDSOSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
- C21B13/029—Introducing coolant gas in the shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/26—Increasing the gas reduction potential of recycled exhaust gases by adding additional fuel in recirculation pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (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 iron making method, and eliminates the disadvantages of the blast furnace iron making method, which requires a large blast furnace construction cost and a vast site. Therefore, it has been developed in recent years.
この還元法においては、製錬炉内の溶銑中に原料とな
る予備還元鉱石又は生鉱石が装入され、また還元材また
は燃料となる炭材及び石炭その他の造滓剤が装入された
製錬炉内に酸素が吹き込まれる。そうすると炭材が溶銑
中に溶解するとともに、炭材の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。溶銑
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、溶銑上を覆っているスラグに伝達され、次いで溶銑
に伝達される。こうして鉄鉱石の還元反応に必要な熱が
鉄鉱石に伝えられ溶銑が効率良く製造される。In this reduction method, a pre-reduced ore or raw ore as a raw material is charged into hot metal in a smelting furnace, and a carbon material and coal or other slag-making agent as a reducing material or fuel are charged. Oxygen is blown into the smelting furnace. Then, the carbon material is dissolved in the hot metal, and C of the carbon material 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 carbonaceous material. The CO gas generated from the hot metal is secondarily combusted by the oxygen gas blown excessively to become CO 2 gas. The sensible heat of the CO 2 gas is transferred to the slag covering the hot metal and then to the hot metal. Thus, the heat required for the reduction reaction of the iron ore is transmitted to the iron ore, and the hot metal is efficiently produced.
［発明が解決しようとする問題点］ しかしながら、上記鉄鉱石の還元工程においてスラグ
の塩基度が高いと滓化不良となって前記還元反応が阻害
され、またスラグ中の鉄の含有量即ち（Ｔ・Fe）が高く
なり鉄の歩留りが低下する。逆に前記塩基度が低い場合
にはスラグフォーミングが大きくなって操業が安定せ
ず、また塩基性耐火物である製錬炉のワーク煉瓦の溶損
が激しくなる。[Problems to be Solved by the Invention] However, if the basicity of the slag is high in the iron ore reduction step, slag formation is poor, the reduction reaction is inhibited, and the iron content in the slag, ie, (T・ Fe) increases and the iron yield decreases. Conversely, when the basicity is low, the slag forming becomes large and the operation is not stable, and the work brick of the smelting furnace, which is a basic refractory, is severely eroded.
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、炉壁または炉低の羽口の溶損もしくは損
耗を軽減し、鉄鉱石の還元速度の促進を図った溶融還元
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 there is provided a smelting reduction method which aims to reduce erosion or wear of a furnace wall or a tuyere of a furnace lower and to promote a reduction rate of iron ore. It is something to offer.
［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直接装入
するとともに、石炭等の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、溶融還元製錬中
に造滓剤及び石炭の装入量を制御してスラグの塩基度を
1.2乃至1.8とす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 directly from the furnace to the smelting furnace, carbon materials such as coal and slag forming agent are charged into the smelting furnace, and oxygen is produced from an upper-blowing oxygen lance having nozzles for decarburization and secondary combustion. A method in which a gas for stirring is blown into a smelting furnace and, at the same time, a gas for stirring is blown from a tuyere provided at a side wall and a tuyere provided at a furnace bottom of the smelting furnace to melt-reduce iron ore. To control the slag basicity
It is characterized by 1.2 to 1.8.
スラグの塩基度を1.2以上とするのでスラグフォーミ
ングは大き過ぎることはなく、ワークレンガの溶損は軽
減され、また前記塩基度は1.8未満であるので滓化性は
良好で、前記（Ｔ・Fe）増大による鉄の歩留りの低下は
避けられる。Since the basicity of the slag is 1.2 or more, the slag forming is not too large, the erosion of the work brick is reduced, and the basicity is less than 1.8, so that the slag forming property is good and the (T · Fe ) A decrease in iron yield due to an increase is avoided.
［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剤が装入される
第１のシュート13が前記製錬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
き込むノズル24が設けられている。第１図で酸素ランス
21の先端に示した矢印28、29は夫々脱炭用、２次燃焼用
の酸素の吹きだし方向を示す。前記炉の上方には流動層
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
発生ガスを供給する導管33が設けられている。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. 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 agent as auxiliary materials are charged is provided at the upper part of the smelting furnace, and an oxygen lance 21 for blowing oxygen is inserted vertically into the furnace. Have been. The lance is provided with nozzles 22 and 23 for ejecting oxygen for decarburization and oxygen for secondary combustion, respectively, and a nozzle 24 is provided at the center of the tip of the lance for mainly injecting auxiliary material such as carbon material or coal. ing. Fig. 1 oxygen lance
Arrows 28 and 29 shown at the tip of 21 indicate the directions of blowing oxygen for decarburization and secondary combustion, respectively. Above the furnace, a preheating pre-reduction furnace 30, which is a fluidized bed type reactor, is provided, to which iron ore is supplied from a second chute 31, where the preheated and pre-reduced iron ore is converted to a third ore. Is charged into the smelting furnace 10 from the chute 32. A conduit 33 that supplies gas generated in the smelting furnace 10 to the preheating pre-reduction furnace 30 is provided.
また、予熱予備還元炉30の排ガスからダストを除去す
るホットサイクロン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。Further, a hot cyclone 34 for removing dust from exhaust gas of the preheating pre-reduction furnace 30 and a heat exchanger 35 for obtaining steam using sensible heat of exhaust gas of the pre-heating pre-reduction furnace 30 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.
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。In consideration of the raw material situation, equipment cost, easiness of operation, etc., a shaft furnace type with good thermal efficiency or a rotary kiln type with low equipment cost and easy operation should be provided as a preheating pre-reduction furnace. Does not hinder the practice of 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
熱および還元された後、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、造滓剤は装入装
置が簡便である通常のホッパー（図示せず）から第１の
シュートを通して製錬炉10内に装入される外、必要に応
じて上記酸素ランスに設けたノズル24から粉状として装
入することも可能である。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 and preheated and reduced. It is charged through the third chute 32. Coal and slag-making agent as auxiliary raw materials are charged into the smelting furnace 10 through a first chute from a normal hopper (not shown) having a simple charging device. It is also possible to charge as powder from the nozzle 24 provided in the nozzle.
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から吹き込
まれる攪拌用ガスによって、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Ar、N2等の不活性ガス及び前記予熱予備還元炉
からの排ガスが用いられる。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。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、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。以上の通り製錬炉内のガスは
２次燃焼用酸素によって酸化度は高められ２次燃焼効率
は向上される。The raw materials and auxiliary raw materials charged into the smelting furnace as described above are already formed in the furnace by the stirring gas blown from the tuyeres 25 and 26 provided on the side walls and the bottom of the smelting furnace. Stir well with iron bath and slag layer. The stirring gas Ar, the exhaust gas from the inert gas and the preheating preliminary reducing furnace such as 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. Also, the exhaust gas from the preheating pre-reduction furnace 30 is subjected to dust removal by the hot cyclone 34,
The heat is exchanged by the steam generator 35 and discharged out of the system. However, the gas is used as a stirring gas of the smelting furnace 10 by the switching valve 36 as necessary. 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. As described above, the degree of oxidation of the gas in the smelting furnace is increased by the oxygen for secondary combustion, and the secondary combustion efficiency is improved.
次に塩基度の調整について説明する。第２図は、溶融
還元時のスラグ塩基度とスラグ厚さの関係で、図中LSは
スラグ厚さ、LMはスラグ厚さ、LMはメタル深さである。
主として鉄鉱石の溶融還元時、装入される石炭に含まれ
るSiO2がスラグに溶解されてスラグの塩基度を低下させ
る。第２図に示す通り前記塩基度が1.2未満に低下する
とスラグフォーミングを増大させ、スロッピング発生の
原因となる。このスラグフォーミングまたはスロッピン
グは何れも製錬炉の操業に重大な支障をきたす。これを
防ぐたためCaOの多く含まれている造滓剤である石灰、
軽焼ドロマイトまたは風滓スラグを前記製錬炉内のスラ
グに添加して前記塩基度を増加させる。逆に塩基度が高
くなって1.8を超えるとスラグ中の（Ｔ・Fe）の増加に
よる歩留りの低下が問題となる。塩基度を下げるSiO2は
上記のように石炭により供給されるが、速く塩基度を下
げたい場合は粉状の石炭は酸素ランスのノズル24または
精錬炉10の炉壁に設けた羽口25、26から吹き込まれる。
塩基度を高くする造滓剤の添加についても同様であっ
て、通常は第１のシュートから投入されるが、塩基度の
調整を速く行う場合は粉状のものを酸素ランスのノズル
24または製錬炉の炉壁に設けた羽口25、26から吹き込む
ことが有効である。Next, the adjustment of the basicity will be described. Figure 2 is a relationship between the slag basicity and the slag thickness at the smelting reduction, figure L S is the slag thickness, L M is the slag thickness, L M is a metal depth.
Mainly during the smelting reduction of iron ore, SiO 2 contained in the charged coal is dissolved in the slag and lowers the basicity of the slag. As shown in FIG. 2, when the basicity is reduced to less than 1.2, slag forming is increased and slopping occurs. Either slag forming or slopping seriously hinders the operation of the smelting furnace. To prevent this, lime, which is a slag-making agent that contains a lot of CaO,
Lightly fired dolomite or slag slag is added to the slag in the smelting furnace to increase the basicity. Conversely, if the basicity increases and exceeds 1.8, the yield will decrease due to an increase in (T.Fe) in the slag. SiO 2 for lowering the basicity is supplied by coal as described above, but if it is desired to reduce the basicity quickly, the powdery coal is a nozzle 24 of an oxygen lance or a tuyere 25 provided on the furnace wall of the refining furnace 10, It is blown in from 26.
The same applies to the addition of the slag-making agent for increasing the basicity. Usually, the slag-making agent is charged from the first chute.
It is effective to blow from 24 or tuyeres 25 and 26 provided on the furnace wall of the smelting furnace.
［発明の効果］ 本発明の溶融還元法によれば、造滓剤及び石炭の炉内
への装入量を制御して前記塩基度を1.2乃至1.8とするの
で、スラグフォーミングまたはスロッピングの発生を防
ぎ溶融還元の操業が安定するとともに（Ｔ・Fe）の増加
による歩留りの低下を防ぐことが出来る。[Effects of the Invention] According to the smelting reduction method of the present invention, the basicity is controlled to 1.2 to 1.8 by controlling the charging amount of the slag-forming agent and coal into the furnace, so that slag forming or slopping occurs. And the operation of smelting reduction is stabilized, and a decrease in yield due to an increase in (T.Fe) can be prevented.
第１図は、この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、溶融還元時のスラグ塩基度（CaO/
SiO2）とスラグ厚さの関係図である。 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……予熱予備還元炉。FIG. 1 is an explanatory view of a process used in the smelting reduction method of the present invention, and FIG. 2 is a slag basicity (CaO /
A relationship diagram of SiO 2) and the slag thickness. 10 ... smelting furnace, 11 ... iron bath, 12 ... slag layer, 13 ... first chute, 21 ... oxygen lance, 22, 23, 24 ... nozzle, 25, 26 ... tuyere, 30 …… Preheating pre-reduction furnace.
───────────────────────────────────────────────────── 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 山田 健三 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 昭61−64807（ＪＰ，Ａ) 特開 昭63−223112（ＪＰ，Ａ) 特開 昭62−228410（ＪＰ，Ａ) 特開 昭62−185812（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Masahiro Kawakami 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Kenzo Yamada 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Examiner Takashi Tsuno (56) References JP-A-61-64807 (JP, A) JP-A-63-223112 (JP, A) JP-A-62-228410 (JP, A) JP-A 62-228410 185812 (JP, A)
Claims (4)
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直接装入するとともに、石炭
等の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、溶融還元製錬中に造滓剤及び石炭の
装入量を制御してスラグの塩基度を1.2乃至1.8とするこ
とを特徴とする溶融還元法。An iron ore that has been preheated and pre-reduced in a preheating prereduction furnace that introduces gas generated from a smelting furnace as a reducing gas is directly charged from the preheating prereduction furnace into the smelting furnace, and coal or the like is produced. The carbonaceous material and the slag-making agent are charged into the smelting furnace, and oxygen is blown into the smelting furnace from an upper-blowing oxygen lance having nozzles for decarburization and secondary combustion. A method for smelting and reducing iron ore by blowing gas for stirring from tuyeres provided in the slag, and controlling the charging amounts of slag-making agent and coal during smelting reduction smelting to adjust the slag basicity to 1.2 to A smelting reduction method characterized by 1.8.
ラグ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 the slag-making agent is coal, lightly fired dolomite, and air-milled slag.
たノズルまたは製錬炉の炉壁に設けた羽口からキャリア
ガスと共に吹き込んでスラグに添加することを特徴とす
る特許請求の範囲第１項または第２項に記載の溶融還元
法。3. The method according to claim 1, wherein the slag forming agent and coal are added to the slag by blowing together with a carrier gas from a nozzle provided on the top-blown oxygen lance or a tuyere provided on the furnace wall of the smelting furnace. 3. The smelting reduction method according to item 1 or 2.
またはプロセスガスであることを特徴とする特許請求の
範囲第１項乃至第３項のいずれか１項に記載の溶融還元
法。4. The melting method according to claim 1, wherein the stirring gas is an inert gas such as Ar or N 2 or a process gas. Reduction method.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62260606A JP2596003B2 (en) | 1987-10-15 | 1987-10-15 | Smelting reduction method |
| US07/246,456 US4936908A (en) | 1987-09-25 | 1988-09-19 | Method for smelting and reducing iron ores |
| AU22448/88A AU607807C (en) | 1987-09-25 | 1988-09-20 | Method for smelting and reducing iron ores and apparatus therefor |
| DE88115580T DE3880245T2 (en) | 1987-09-25 | 1988-09-22 | Method and device for melting and reducing iron ores. |
| EP88115580A EP0308925B1 (en) | 1987-09-25 | 1988-09-22 | Method and apparatus for smelting and reducing iron ores |
| AT88115580T ATE88218T1 (en) | 1987-09-25 | 1988-09-22 | METHOD AND APPARATUS FOR MELTING AND REDUCING IRON ORE. |
| CA000578419A CA1336542C (en) | 1987-09-25 | 1988-09-23 | Method for smelting and reducing iron ores and apparatus therefor |
| CN88106882A CN1014721B (en) | 1987-09-25 | 1988-09-24 | Method and apparatus for producing molten pig iron by reducing iron ore |
| KR1019880012423A KR910006005B1 (en) | 1987-09-25 | 1988-09-24 | Melt reduction method of iron ore and apparatus therefor |
| US07/503,805 US4988079A (en) | 1987-09-25 | 1990-04-03 | Apparatus for smelting and reducing iron ores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62260606A JP2596003B2 (en) | 1987-10-15 | 1987-10-15 | Smelting reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01104709A JPH01104709A (en) | 1989-04-21 |
| JP2596003B2 true JP2596003B2 (en) | 1997-04-02 |
Family
ID=17350269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62260606A Expired - Fee Related JP2596003B2 (en) | 1987-09-25 | 1987-10-15 | Smelting reduction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596003B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468848A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Method for treating high-iron red mud by high-temperature iron bath |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107588B (en) * | 2021-11-03 | 2022-10-11 | 临沂市钢铁产业协同创新中心 | Preparation method of high-purity molten iron |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164807A (en) * | 1984-09-03 | 1986-04-03 | Nippon Steel Corp | Iron ore melting reduction method |
| JPS62185812A (en) * | 1986-02-10 | 1987-08-14 | Nippon Kokan Kk <Nkk> | Smelting and reduction iron making method |
| JPS62228410A (en) * | 1986-03-31 | 1987-10-07 | Kawasaki Steel Corp | Method for recovering metal from granular ore by melt reduction |
| JPS63223112A (en) * | 1987-03-12 | 1988-09-16 | Sumitomo Metal Ind Ltd | Iron ore melting reduction method |
-
1987
- 1987-10-15 JP JP62260606A patent/JP2596003B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468848A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Method for treating high-iron red mud by high-temperature iron bath |
| CN103468848B (en) * | 2013-09-06 | 2015-05-06 | 鞍钢股份有限公司 | Method for treating high-iron red mud by high-temperature iron bath |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01104709A (en) | 1989-04-21 |
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