JPS62228878A - Iron ore spare reducing device - Google Patents
Iron ore spare reducing deviceInfo
- Publication number
- JPS62228878A JPS62228878A JP7156286A JP7156286A JPS62228878A JP S62228878 A JPS62228878 A JP S62228878A JP 7156286 A JP7156286 A JP 7156286A JP 7156286 A JP7156286 A JP 7156286A JP S62228878 A JPS62228878 A JP S62228878A
- Authority
- JP
- Japan
- Prior art keywords
- fluidized bed
- reduction furnace
- furnace
- ore
- reduction
- 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.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 44
- 229910052742 iron Inorganic materials 0.000 title claims description 22
- 230000009467 reduction Effects 0.000 claims description 90
- 238000003723 Smelting Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 14
- 239000007789 gas Substances 0.000 description 25
- 239000003245 coal Substances 0.000 description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 13
- 239000002994 raw material Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 235000019738 Limestone Nutrition 0.000 description 5
- 238000007664 blowing Methods 0.000 description 5
- 239000003575 carbonaceous material Substances 0.000 description 5
- 239000012159 carrier gas Substances 0.000 description 5
- 239000006028 limestone Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000000911 decarboxylating effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- QVGXLLKOCUKJST-AKLPVKDBSA-N oxygen-19 atom Chemical compound [19O] QVGXLLKOCUKJST-AKLPVKDBSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、溶融還元法に使用するため、鉄鉱石を流動層
予備還元炉で還元する装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for reducing iron ore in a fluidized bed pre-reduction furnace for use in a smelting reduction process.
鉄鉱石を還元して溶銑を製造するために、高炉を使用す
る方法、シャフト炉で還元した鉄鉱石を電気炉で溶解す
る方法等が従来から採用されている。In order to reduce iron ore to produce hot metal, methods such as using a blast furnace and melting iron ore reduced in a shaft furnace in an electric furnace have been adopted.
高炉を使用する方法においては、熱源及び還元剤として
多量のコークスを使用している。また、鉄源である鉄鉱
石は、炉内における通気性、還元性を向上させるために
通常焼結され、焼結鉱とし高炉に装入されている。この
ようなことから、該高炉法は、強粘結炭を乾溜するため
のコークス炉設備及び焼結鉱を製造するための焼結設備
を必要とする。したがって、該高炉法には、多大な設備
費は勿論のこと、多くのエネルギー及び労働が必要とな
る。このため、高炉法には処理コストが高くなるという
欠点があった。更に、強粘結炭は世界的に賦存量が少な
く、しかもその分布が地域的に偏っているため、供給が
不安定である。In the method using a blast furnace, a large amount of coke is used as a heat source and a reducing agent. Further, iron ore, which is an iron source, is usually sintered to improve air permeability and reducibility in the furnace, and is charged into a blast furnace as a sintered ore. For this reason, the blast furnace method requires coke oven equipment for dry distilling highly caking coal and sintering equipment for producing sintered ore. Therefore, the blast furnace method requires a large amount of energy and labor as well as a large amount of equipment cost. For this reason, the blast furnace method has the disadvantage of high processing costs. Furthermore, the availability of strong coking coal is small worldwide, and its distribution is regionally uneven, making its supply unstable.
一方、シャフト炉による鉄鉱石の還元法では、鉄鉱石を
ペレット化する前処理を行うことが必要となり、また還
元剤、熱源として高価な天然ガス等を多量に消費すると
いう欠点がある。On the other hand, the method of reducing iron ore using a shaft furnace requires pretreatment to pelletize the iron ore, and has the disadvantage that it consumes a large amount of reducing agent and expensive natural gas as a heat source.
このような従来の溶銑製造技術に代わるものとして、溶
融還元製錬法が注目を浴びている。この方法で使用する
溶融還元炉は、使用する原料に制約を受けることな（、
より小規模な設備により鉄系合金の溶湯を製造すること
を目的として開発されたものである。As an alternative to such conventional hot metal production technology, the smelting reduction smelting method is attracting attention. The smelting reduction furnace used in this method is not limited by the raw materials used (
It was developed for the purpose of producing molten iron-based alloys using smaller-scale equipment.
このような溶融還元法の一つとして、本発明者等は、先
に第３図に示すようなフローで構成される方法をｖＦＶ
ＩＭ昭５９−１８４０５６号として提案した。As one of such melt reduction methods, the present inventors previously proposed a method consisting of the flow shown in FIG.
It was proposed as IM No. 59-184056.
この方法によるとき、次のようにして溶銑が製造される
。すなわち、鉄鉱石１及び石灰石２は、流動層予熱炉３
内で石炭４と空気５との燃焼反応で生じた熱によって加
熱される。その結果、石灰石２ （ＣａＣＯｓ）は、生
石灰（Ｃａｎ）となって流動店子６ｔｆｆ還元炉６に供
給される。According to this method, hot metal is produced as follows. That is, iron ore 1 and limestone 2 are transported to a fluidized bed preheating furnace 3.
It is heated by the heat generated by the combustion reaction between coal 4 and air 5 inside. As a result, the limestone 2 (CaCOs) turns into quicklime (Can) and is supplied to the fluidized steel 6tff reduction furnace 6.
流動層予備還元炉６内では、流動状態の予熱鉱石及び生
石灰に、石炭７及び酸素又は酸素含有ガス８が吹き込ま
れる。この石炭７は、流動層予備還元炉６内で予熱鉱石
と熱交換し、また酸素との反応による部分燃焼によって
熱分解する。これによって、石炭７は、還元性のガスを
発生すると共に、チャー９となる。In the fluidized bed pre-reduction furnace 6, coal 7 and oxygen or oxygen-containing gas 8 are blown into the preheated ore and quicklime in a fluidized state. This coal 7 exchanges heat with the preheated ore in the fluidized bed pre-reduction furnace 6 and is thermally decomposed by partial combustion due to reaction with oxygen. As a result, the coal 7 generates reducing gas and becomes char 9.
他方、溶融還元炉１ｏで発生したガス又はそのガスを脱
炭酸処理して得られる還元ガス１１は、流動層予備還元
炉６からの燃料ガス１２との熱交換によって７００〜９
００℃に昇温された後、流動層予備還元炉６に吹き込ま
れる。流動層予備還元炉６に吹き込まれた還元ガス１１
は、石炭７の熱分解により生成した還元ガスと混合され
、流動状態にある高温の粉粒状鉄鉱石を還元し、還元鉱
１３を生成する。On the other hand, the gas generated in the smelting reduction furnace 1o or the reducing gas 11 obtained by decarboxylating the gas is reduced to 700 to 90% by heat exchange with the fuel gas 12 from the fluidized bed preliminary reduction furnace 6.
After being heated to 00°C, it is blown into a fluidized bed pre-reduction furnace 6. Reducing gas 11 blown into the fluidized bed preliminary reduction furnace 6
is mixed with the reducing gas produced by thermal decomposition of the coal 7, reduces the hot powdery iron ore in a fluidized state, and produces the reduced ore 13.
また、流動層予熱炉３内に生成した生石灰１４は、予熱
鉱石と共に流動層予備還元炉６に装入され、流動層予備
還元炉６内にあるガスの脱硫を行う。Moreover, the quicklime 14 produced in the fluidized bed preheating furnace 3 is charged into the fluidized bed prereduction furnace 6 together with the preheated ore, and the gas in the fluidized bed prereduction furnace 6 is desulfurized.
次いで、該生石灰１４は、還元鉱Ｉ３及びチャー９と共
に流動層予備還元炉６から排出される。Next, the quicklime 14 is discharged from the fluidized bed pre-reduction furnace 6 together with the reduced ore I3 and the char 9.
このようにして得られた還元鉱１３．チャー９及び生石
灰１４に対して、溶融還元炉１ｏにおける熱バランス上
必要な石炭、コークス等の炭材が外部がら加えられ混練
される。次いで、この混合物は、ブリケットマシン等の
塊成化１ｘｘｓによってブリケット１６に成形された後
、装入装置１７によって溶融還元炉１０に装入される。Reduced ore thus obtained 13. Carbon materials such as coal and coke necessary for the heat balance in the smelting reduction furnace 1o are added to the char 9 and quicklime 14 from the outside and kneaded. Next, this mixture is formed into briquettes 16 by agglomeration 1xxs such as a briquette machine, and then charged into the melting reduction furnace 10 by a charging device 17.
この溶融還元炉ＩＯ内には、上吹きランス１８がら酸素
１９が浴に向かって吹き付けられると共に、底吹き羽口
２０から浴中に酸素及び炭材が吹き込まれている。そし
て、ブリケット１６に含まれている炭材、底吹き羽口２
０から酸素と共に吹き込まれている炭材、装入装置１７
から供給されたコークス２１等の炭材は、上吹きランス
１８から供給された酸素と反応し、溶融還元炉ｌＯ内に
多量の熱を発生する。In the melting reduction furnace IO, oxygen 19 is blown toward the bath from the top blowing lance 18, and oxygen and carbonaceous material are blown into the bath from the bottom blowing tuyere 20. Then, the charcoal material contained in the briquette 16, the bottom blowing tuyere 2
Carbon material being blown in with oxygen from 0, charging device 17
The carbonaceous material such as coke 21 supplied from the top blowing lance 18 reacts with the oxygen supplied from the top blowing lance 18, and generates a large amount of heat in the melting reduction furnace IO.
この発生熱によって、ブリケット１６中の還元鉱１３が
溶解し、還元が進行して溶銑２２となる。This generated heat melts the reduced ore 13 in the briquettes 16, and the reduction progresses to become hot metal 22.
一方、還元鉱１３中の脈石と炭材及び生石灰１４とが反
応して、スラグ２３が生成する。このスラグ２３は、溶
融還元炉１０内に貯留し、時間が経過するにつれその量
を増していく、そこで、該スラグ２３を間欠的又は連続
的に炉外に排出する。On the other hand, the gangue in the reduced ore 13 reacts with the carbon material and the quicklime 14, and slag 23 is generated. This slag 23 is stored in the melting reduction furnace 10 and increases in amount as time passes, so the slag 23 is intermittently or continuously discharged outside the furnace.
このような溶融還元法においては、特にその開発過程か
らしても明らかなように、使用可能な原料の範囲の拡大
、熱回収の効率化、溶融還元炉における製錬反応の促進
等を如何にして達成するかが今後の課題である。In this type of smelting reduction method, as is clear from the development process, it is important to expand the range of usable raw materials, improve the efficiency of heat recovery, and promote the smelting reaction in the smelting reduction furnace. The challenge for the future is whether this can be achieved.
しかし、一般炭、粉鉱石等の廉価な原料を使用すると、
処理過程で多量の粉塵が発生し、艮業性が悪くなるので
、粉塵を発生しない原料が使用されている。また、これ
までに開発されている溶融還元法においては、流動層予
備還元炉から排出される還元鉱は、必要に応じて熱回収
した後、単に溶融還元炉に投入しているに過ぎない。こ
のような方式では、効率的な熱回収及び製錬反応の促進
を行うことに限度があり、また溶融還元炉まで還元鉱を
送る搬送も困難になる。However, if cheap raw materials such as thermal coal and fine ore are used,
A large amount of dust is generated during the processing process, which impairs the workmanship, so raw materials that do not generate dust are used. In addition, in the smelting reduction methods that have been developed so far, the reduced ore discharged from the fluidized bed preliminary reduction furnace is merely charged into the smelting reduction furnace after heat recovery as necessary. In such a system, there is a limit to efficient heat recovery and promotion of the smelting reaction, and it is also difficult to transport the reduced ore to the smelting reduction furnace.
そこで、本発明は、流動層予備還元炉から排出される還
元鉱の性状に着目し、その性状に応じた搬送手段を採用
して、還元鉱をそのままの高温状態で細粒及び粗粒毎に
溶融還元炉に搬送することにより、溶融還元法の生産性
を向上させることを目的とする。Therefore, the present invention focuses on the properties of the reduced ore discharged from the fluidized bed pre-reduction furnace, adopts a conveying means according to the properties, and separates the reduced ore into fine particles and coarse particles in the same high temperature state. The purpose is to improve the productivity of the smelting reduction method by transporting it to the smelting reduction furnace.
本発明の鉄鉱石予備還元装置は、その目的を達成するた
め、熔融還元法に使用する予備還元鉱を製造する設備に
おいて、流動層予備還元炉に粒子循環装置を付設し、該
粒子循環装置から排出される還元鉱を溶融還元炉に搬送
する経路にニューマチックフィーダーを設け、他方流動
層予備還元炉の下部から排出される還元鉱を溶融還元炉
に送る経路に機械的な搬送手段及び／又はニューマチッ
クフィーダーを設けたことを特徴とする。In order to achieve the purpose of the iron ore pre-reduction device of the present invention, in equipment for producing pre-reduced ore used in the smelting reduction method, a particle circulation device is attached to a fluidized bed pre-reduction furnace, and from the particle circulation device. A pneumatic feeder is provided on the path for conveying the discharged reduced ore to the smelting reduction furnace, and a mechanical conveying means and/or It is characterized by having a pneumatic feeder.
本発明においては、細粒状の還元鉱を粒子循環装置から
取り出し、粗粒状の還元鉱を流動層予備還元炉の底部か
ら取り出している。この粒子循環装置から取り出された
還元鉱は、流動層予備還元炉における風篩作用によって
細粒に整粒されたものであるから、気流搬送に適する。In the present invention, fine-grained reduced ore is taken out from the particle circulation device, and coarse-grained reduced ore is taken out from the bottom of the fluidized bed pre-reduction furnace. Since the reduced ore taken out from this particle circulation device has been sized into fine particles by the air sieving action in the fluidized bed pre-reducing furnace, it is suitable for air flow conveyance.
ところで、流動層予備還元炉の内圧と溶融還元炉の圧力
とは、等しくない、流動層予備還元炉の内圧が高い場合
には、その内圧によって還元鉱を溶融還元炉に搬送する
ことができる。しかし、このような搬送は、流動層予備
還元炉及び溶融還元炉の操業条件を拘束するものとなる
。また、溶融還元炉を高圧操業する場合には、このよう
な流動層予備還元炉の内圧による搬送は採用できない。By the way, the internal pressure of the fluidized bed preliminary reduction furnace and the pressure of the smelting reduction furnace are not equal. When the internal pressure of the fluidized bed preliminary reduction furnace is high, the reduced ore can be transported to the smelting reduction furnace by the internal pressure. However, such transportation restricts the operating conditions of the fluidized bed pre-reduction furnace and the smelting reduction furnace. Further, when operating the melting reduction furnace at high pressure, such conveyance using the internal pressure of the fluidized bed pre-reduction furnace cannot be adopted.
この点、本発明においては、流動層予備還元炉から溶融
還元炉までの搬送経路に、細粒部分の搬送の為にニュー
マチックフィーダーを用い、粗粒部分の搬送のために機
械的搬送手段及び／又はニューマチックフィーダーを用
いているので、流動層予備還元炉から排出された還元鉱
を高温状態のままで溶融還元炉に搬送することができる
。In this regard, in the present invention, a pneumatic feeder is used in the conveyance path from the fluidized bed pre-reduction furnace to the smelting reduction furnace to convey the fine grain portion, and a mechanical conveyor and a mechanical feeder are used to convey the coarse grain portion. /Or since a pneumatic feeder is used, the reduced ore discharged from the fluidized bed pre-reduction furnace can be transported to the smelting reduction furnace in a high temperature state.
以下、実施例により本発明の特徴を具体的に説明する。 Hereinafter, the features of the present invention will be specifically explained with reference to Examples.
第１図は本発明の流動層還元装置の要部を示すものであ
る。なお、第１図において、第３図に示したものと同じ
材料１機構等は同じ符番で指示している。FIG. 1 shows the main parts of the fluidized bed reduction apparatus of the present invention. In addition, in FIG. 1, the same material 1 mechanism, etc. as shown in FIG. 3 are indicated by the same reference numerals.
鉄鉱石１２石灰石２等の製鉄原料は、それぞれのホンパ
ー１ａ、 ２ａを介して流動層予熱炉３に投入され、こ
の流動層予熱炉３で予熱された後、流動層予備還元炉６
に送りこまれる。この流動層予備還元炉６には、溶融還
元炉１０から排出される還元ガス１１が送り込まれてお
り、この還元ガス１１によって、鉄鉱石ｌが流動層予備
還元炉６内で予備還元される。Iron ore 12, limestone 2, and other raw materials for iron making are charged into a fluidized bed preheating furnace 3 via respective hompers 1a and 2a, and after being preheated in this fluidized bed preheating furnace 3, they are transferred to a fluidized bed prereduction furnace 6.
sent to. Reducing gas 11 discharged from the smelting reduction furnace 10 is fed into the fluidized bed pre-reduction furnace 6, and the iron ore 1 is pre-reduced in the fluidized bed pre-reduction furnace 6 by this reducing gas 11.
このとき、流ｖＪＭ予熱炉３から延びる排ガス煙道２４
の途中に、主として粉粒状の鉄鉱石１石灰石等の製鉄原
料を供給する０本実施例においては、これらの粉粒状の
製鉄原料は、ホッパー１ａ、 ２ａから排ガス煙道２４
に投入され、配管２５を経て多段式のサイクロン２６に
送られる。この搬送過程で、排ガス煙道２４から送られ
てくる排ガスと熱交換しながら加熱された後、サイクロ
ン２６で排ガスと分離され、ニューマチックフィーダー
２７により流動層予熱炉３に切り出される。。At this time, the exhaust gas flue 24 extending from the flow vJM preheating furnace 3
In this embodiment, these powdered iron ore raw materials such as limestone are supplied to the hoppers 1a and 2a through the exhaust gas flue 24.
and is sent to a multi-stage cyclone 26 via a pipe 25. During this conveyance process, it is heated while exchanging heat with the exhaust gas sent from the exhaust gas flue 24 , is separated from the exhaust gas by the cyclone 26 , and is fed to the fluidized bed preheating furnace 3 by the pneumatic feeder 27 . .
流動層予熱炉３には、石炭７がホッパー７８を介して投
入されている。また、該流動層予熱炉３内には、炉床に
設けた空気分散ノズル、多孔板等を介して流動燃焼用の
空気５が送りこまれている。Coal 7 is charged into the fluidized bed preheating furnace 3 via a hopper 78. Furthermore, air 5 for fluidized combustion is fed into the fluidized bed preheating furnace 3 via an air distribution nozzle, a perforated plate, etc. provided in the hearth.
この空気５により、投入された石炭７が流動燃焼し、流
動層予熱炉３内の流動層を６００〜１０００℃の範囲に
維持している。このような雰囲気の下に、投入された鉄
鉱石１１石灰石２等の原料は、予熱焙焼される。This air 5 causes fluidized combustion of the introduced coal 7, and maintains the temperature of the fluidized bed in the fluidized bed preheating furnace 3 in the range of 600 to 1000°C. In such an atmosphere, the input raw materials such as iron ore 11 and limestone 2 are preheated and roasted.
流動層予熱炉３から排出された予熱された鉄鉱石１石灰
等の混合物は、石炭７が変質してできたチャーを混入し
ている。この混合物を切出し、ニスマチツタフィーダー
２フ、ロータリフイーダー等により流動層予備還元炉６
に装入する。The preheated mixture of iron ore, lime, etc. discharged from the fluidized bed preheating furnace 3 contains char produced by alteration of the coal 7. This mixture is cut out and transferred to a fluidized bed pre-reduction furnace 6 using a Nisma Chitta feeder 2F, a rotary feeder, etc.
Charge to.
溶融還元炉１０から排出された還元ガス１１が、炉下部
を通して流動層予備還元炉６内に吹き込まれている。こ
の還元ガス１１により、流動層予熱炉３から送り込まれ
た鉄鉱石等の原料は、流動層予備還元炉６内で浮遊流動
され、還元ガス１１に含まれているＣｏ、 １１．等に
よって予備還元される。還元ガス１１吹込みの空塔速度
は、流動層予備還元炉６内で鉄鉱石等がフリーボード内
を浮遊飛散する程度に大きくする。これにより、還元反
応性が向上する。Reducing gas 11 discharged from the melting reduction furnace 10 is blown into the fluidized bed preliminary reduction furnace 6 through the lower part of the furnace. With this reducing gas 11, raw materials such as iron ore sent from the fluidized bed preheating furnace 3 are floated and fluidized in the fluidized bed preheating furnace 6, and the Co contained in the reducing gas 11, 11. Preliminary reduction is made by etc. The superficial velocity of the reducing gas 11 is set to be high enough to cause iron ore and the like to float and scatter within the freeboard in the fluidized bed preliminary reduction furnace 6. This improves reduction reactivity.
また、流動層予備還元炉６から外部に飛散した鉄鉱石を
再び流動層予備還元炉６に戻すために、流動層予備ｊ夏
元炉６の上部に粒子循環装置２８を設けている。この粒
子循環装置２８としては、第１図で示されているように
、多段式のサイクロン２８ａによりｔ１１ｊ集したわ）
鉱石をホッパー２８ｂで一時的に貯え、ニューマチック
フィーダー２８ｃにより流動層予備還元炉６に戻す形式
のものが使用される。Further, in order to return the iron ore scattered outside from the fluidized bed preliminary reduction furnace 6 to the fluidized bed preliminary reduction furnace 6, a particle circulation device 28 is provided above the fluidized bed preliminary reduction furnace 6. As shown in FIG. 1, this particle circulation device 28 collects t11j using a multi-stage cyclone 28a)
A type is used in which ore is temporarily stored in a hopper 28b and returned to the fluidized bed pre-reduction furnace 6 by a pneumatic feeder 28c.
このｗｉ環経路においてニュマチッタフィーダー２８ｃ
を用いるとき、粒子移送機構に機械的駆動部がないので
、故障が少ないという利点がある。In this wi ring route, the pneumaticta feeder 28c
When using a particle transfer mechanism, there is no mechanical drive part, so there is an advantage that there are fewer failures.
そして、このＷｉ環経路において、還元された原料を、
ニューマチックフィーダー２８ｄにより次段の流動層予
備還元炉６に切り出す、また、最終段の流動層予備還元
炉６に付設した粒子循環装置２８からは、ニューマチ・
ツクフィーダー３２により溶融還元炉１０に扮粒伏の還
元鉱を切り出す。In this Wi ring route, the reduced raw material is
Pneumatic feeder 28d feeds the particles to the next stage fluidized bed pre-reduction furnace 6, and from the particle circulation device 28 attached to the final stage fluidized bed pre-reduction furnace 6, pneumatic
A feeder 32 feeds the reduced ore into the smelting reduction furnace 10 in the form of granules.
このように、流動層予備還元炉６を多段に設けるとき、
還元率の向上、均一な還元及び還元の制御精度の向上が
図られ、しかも還元ガスの利用効率も向上する。なお、
流動層予備還元炉６を多段配置することなく、単独で用
いても良いことはいうまでもない。In this way, when the fluidized bed preliminary reduction furnace 6 is provided in multiple stages,
The reduction rate is improved, the reduction is uniform, and the control accuracy of the reduction is improved, and the efficiency of using the reducing gas is also improved. In addition,
It goes without saying that the fluidized bed preliminary reduction furnace 6 may be used alone without arranging it in multiple stages.
また、流動層予備還元炉６に微粉炭バーナ２９を設け、
還元ガス及び赤熱チャーを生成噴出させることにより、
還元過程における還元ガスの再加熱及びガスの改質が行
われ、還元能力の強化が図られる。その結果、高い生産
性を得ることができる。In addition, a pulverized coal burner 29 is installed in the fluidized bed preliminary reduction furnace 6,
By generating and ejecting reducing gas and red-hot char,
During the reduction process, the reducing gas is reheated and the gas is reformed to strengthen the reducing ability. As a result, high productivity can be obtained.
また、流動層予備還元炉６において、鉄鉱石９石灰等に
石炭、チャー等を混在させることにより、石炭、チャー
による還元ガスの炉内再生機能を持たせることができる
。Further, in the fluidized bed pre-reduction furnace 6, by mixing coal, char, etc. with the iron ore 9 lime, etc., it is possible to provide an in-furnace regeneration function of the reducing gas by the coal and char.
このような流動層還元装置において、流動層予備還元炉
６からの還元鉱の切出しを粒子循環装置２日に繋がる経
路３０及び流動層下部に繋がる経路３１を介して行う。In such a fluidized bed reduction apparatus, the reduced ore is cut out from the fluidized bed preliminary reduction furnace 6 via a path 30 connected to the particle circulation device 2 and a path 31 connected to the lower part of the fluidized bed.
粒子循環装置２８及び流動層下部から切り出された還元
鉱は、それぞれ細粒及び粗粒として経路３０及び３１を
経て溶融還元炉ｌＯに送られる。The reduced ore cut out from the particle circulation device 28 and the lower part of the fluidized bed is sent as fine particles and coarse particles to the smelting reduction furnace IO via paths 30 and 31, respectively.
経路３０の途中には、ニューマチックフィーダー３２が
設けられている。このニューマチックフィーダー３２は
、第２図に示すように、キャリアガス３３を底部から吹
込み、内部に滞留している粉鉱石を溶融還元炉１０に気
流搬送するものである。なお、このとき、キャリアガス
３３を吹き込むヘッダ３２ａを複数に分割し、それぞれ
の分割ヘッダ３２ａに送り込まれるキャリアガス３３の
量を調整する流量調整弁３２ｂを設けておくと、溶融還
元炉１０に送る粉鉱石の流量を調節することが容易にな
る。A pneumatic feeder 32 is provided in the middle of the route 30. As shown in FIG. 2, this pneumatic feeder 32 blows a carrier gas 33 into it from the bottom to convey the fine ore accumulated therein to the smelting reduction furnace 10 by air flow. At this time, if the header 32a into which the carrier gas 33 is blown is divided into a plurality of parts and a flow rate adjustment valve 32b is provided to adjust the amount of the carrier gas 33 sent to each divided header 32a, the amount of the carrier gas 33 sent to the melting reduction furnace 10 may be provided. It becomes easy to adjust the flow rate of fine ore.
これにより、経路３０を経て送られてきた細粒状の還元
鉱は、加圧されて溶融還元炉ｌＯ内に吹き込まれる。こ
のとき使用されるキャリアガス３３としては、還元性ガ
ス、不活性ガス等がある。As a result, the fine-grained reduced ore sent through the path 30 is pressurized and blown into the smelting reduction furnace IO. The carrier gas 33 used at this time includes reducing gas, inert gas, and the like.
他方、経路３１の途中には、パンコンベア、チェーンコ
ンベア５バケツト等の機械的搬送機３４が設けられてい
る。また、この機械的搬送８１３４の上流側にはロータ
リフィーダー３５が配置されている。On the other hand, in the middle of the route 31, a mechanical conveyor 34 such as a bread conveyor, a chain conveyor, 5 buckets, etc. is provided. Further, a rotary feeder 35 is arranged upstream of this mechanical conveyance 8134.
すなわち、流動層予備還元炉６の下部から切り出された
粗粒状の還元鉱は、ロークリフィーダー３５によって機
械的搬送ａ３４に送られ、次いで溶融還元炉ｌＯ内に投
入される。なお、該機械的搬送４ａ３４に代えて、ニュ
ーマチックフィーダーを採用しても良い。That is, the coarse reduced ore cut out from the lower part of the fluidized bed pre-reduction furnace 6 is sent to the mechanical conveyance a34 by the rock feeder 35, and then thrown into the smelting reduction furnace IO. Note that a pneumatic feeder may be used instead of the mechanical conveyor 4a34.
以上に説明したように、本発明の予備還元装置において
は、細粒鉱及び粗粒鉱をそれぞれ別の個所からとりだし
、その性状に合わせた搬送手段を採用している。このた
め、還元鉱を高温状態のままで溶融還元炉に投入するこ
とが可能である。また、細粒鉱及び粗粒鉱を別個の搬送
経路により溶融還元炉に送っているので、搬送上のトラ
ブルもなく、且つ粒度に応じて溶融還元炉内における特
定の反応域に供給することができる。したがって、溶融
還元炉における反応性も向上する。このようにして、本
発明によるとき、粉鉱石、一般炭等の低度な原料を使用
することができ、且つ高い生産性で溶融還元法を実施す
ることが可能となった。As explained above, in the preliminary reduction apparatus of the present invention, fine-grained ore and coarse-grained ore are taken out from different locations, and conveyance means are used that match their properties. Therefore, it is possible to charge the reduced ore in a high temperature state into the smelting reduction furnace. In addition, since fine-grained ore and coarse-grained ore are sent to the smelting-reduction furnace through separate transport routes, there is no trouble in transporting them, and it is possible to feed them to specific reaction zones in the smelting-reduction furnace depending on the particle size. can. Therefore, the reactivity in the melting reduction furnace is also improved. In this way, according to the present invention, it has become possible to use low-grade raw materials such as fine ore and steam coal, and to carry out the smelting reduction method with high productivity.
第１図は本発明実施例の予備還元装置の概略を示し、第
２図は該予備還元装置におけるニューマチックフィーダ
ーの構造を示す、また、第３図は、本発明者等が先に開
発した溶融還元法のフローを示す。FIG. 1 shows an outline of the pre-reduction device of the embodiment of the present invention, FIG. 2 shows the structure of the pneumatic feeder in the pre-reduction device, and FIG. The flow of the melt reduction method is shown.
Claims (1)
において、 流動層予備還元炉に粒子循環装置を付設し、該粒子循環
装置から排出される還元鉱を溶融還元炉に搬送する経路
にニューマチックフィーダーを設け、他方流動層予備還
元炉の下部から排出される還元鉱を溶融還元炉に送る経
路に機械的な搬送手段及び／又はニューマチックフィー
ダーを設けたことを特徴とする鉄鉱石予備還元装置。[Claims] 1. In a facility for producing pre-reduced ore used in the smelting reduction method, a particle circulation device is attached to the fluidized bed pre-reduction furnace, and the reduced ore discharged from the particle circulation device is transferred to the smelting reduction furnace. A pneumatic feeder is provided on the route for conveying the reduced ore to the smelting reduction furnace, and a mechanical conveying means and/or a pneumatic feeder is provided on the route for conveying the reduced ore discharged from the lower part of the fluidized bed pre-reduction furnace to the smelting reduction furnace. Iron ore preliminary reduction equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7156286A JPS62228878A (en) | 1986-03-28 | 1986-03-28 | Iron ore spare reducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7156286A JPS62228878A (en) | 1986-03-28 | 1986-03-28 | Iron ore spare reducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62228878A true JPS62228878A (en) | 1987-10-07 |
Family
ID=13464276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7156286A Pending JPS62228878A (en) | 1986-03-28 | 1986-03-28 | Iron ore spare reducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62228878A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6469949A (en) * | 1987-09-11 | 1989-03-15 | Kawasaki Steel Co | Apparatus for locating ae generating spot |
| AU678420B2 (en) * | 1992-11-30 | 1997-05-29 | Bogdan Vuletic | Process and device for producing pig iron from iron ore |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6046354A (en) * | 1983-08-23 | 1985-03-13 | Sanpo Shindo Kogyo Kk | Method for processing aluminum bronze in order to obtain superplasticity |
-
1986
- 1986-03-28 JP JP7156286A patent/JPS62228878A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6046354A (en) * | 1983-08-23 | 1985-03-13 | Sanpo Shindo Kogyo Kk | Method for processing aluminum bronze in order to obtain superplasticity |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6469949A (en) * | 1987-09-11 | 1989-03-15 | Kawasaki Steel Co | Apparatus for locating ae generating spot |
| AU678420B2 (en) * | 1992-11-30 | 1997-05-29 | Bogdan Vuletic | Process and device for producing pig iron from iron ore |
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