JPH09165607A - Blast furnace operation method - Google Patents
Blast furnace operation methodInfo
- Publication number
- JPH09165607A JPH09165607A JP7346956A JP34695695A JPH09165607A JP H09165607 A JPH09165607 A JP H09165607A JP 7346956 A JP7346956 A JP 7346956A JP 34695695 A JP34695695 A JP 34695695A JP H09165607 A JPH09165607 A JP H09165607A
- Authority
- JP
- Japan
- Prior art keywords
- blast furnace
- ore
- iron ore
- crystallization
- iron
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Landscapes
- Manufacture Of Iron (AREA)
Abstract
(57)【要約】
【課題】 結晶水を２．０重量％以上含む鉄鉱石を高炉
製銑法の原料として使用して、高炉生産性を高め、コー
クス比を低減する。
【解決手段】 結晶水を２．０重量％以上含む鉄鉱石を
還元率３０％以上に還元した後、高炉製銑法の原料とし
て高炉に装入し、および／または、高炉に吹き込む。鉄
鉱石の還元は、４００℃以上の熱間のＣＯやＨ2 が含ま
れる還元性雰囲気下で行う。
(57) Abstract: An iron ore containing 2.0% by weight or more of water of crystallization is used as a raw material for a blast furnace ironmaking process to improve blast furnace productivity and reduce coke ratio. SOLUTION: An iron ore containing 2.0% by weight or more of water of crystallization is reduced to a reduction rate of 30% or more, and then charged into a blast furnace and / or blown into the blast furnace as a raw material for a blast furnace ironmaking method. Reduction of iron ore is performed in a reducing atmosphere containing CO and H 2 at a temperature of 400 ° C. or higher.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、結晶水を多く含む
鉄鉱石を使用する高炉操業方法に関する。TECHNICAL FIELD The present invention relates to a blast furnace operating method using an iron ore containing a large amount of water of crystallization.
【０００２】[0002]
【従来の技術】今日の製銑法の主体である高炉製銑法の
原料には、鉄鉱石が用いられている。粉鉱石は焼結工程
を経て焼結鉱としてから高炉炉頂から装入し、塊鉱石は
そのまま高炉炉頂から装入している。2. Description of the Related Art Iron ore is used as a raw material for the blast furnace iron making method, which is the main body of today's iron making method. The powdered ore is charged as sinter through the sintering process and then charged from the blast furnace top, and the lump ore is charged as it is from the blast furnace top.
【０００３】高炉を安定かつ高効率で操業するには、冷
間強度、被還元性、耐還元粉化性、焼結歩留り等の特性
に優れた高品質の原料鉱石が要求される。従来から磁鉄
鉱（マグネタイト：Ｆｅ3 Ｏ4 が主成分）と赤鉄鉱（ヘ
マタイト：Ｆｅ2 Ｏ3 が主成分）が主に用いられていた
が、世界の鉄鉱石資源をみると、前記特性に優れた良質
なマグネタイト、ヘマタイト鉱石資源は枯渇する方向に
ある。In order to operate the blast furnace in a stable and highly efficient manner, a high-quality raw material ore having excellent properties such as cold strength, reducibility, resistance to reduction powder, and sintering yield is required. Conventionally, magnetite (magnetite: Fe 3 O 4 is the main component) and hematite (hematite: Fe 2 O 3 is the main component) have been mainly used, but when looking at the world's iron ore resources, the above characteristics are excellent. The high-quality magnetite and hematite ore resources are going to be exhausted.
【０００４】これに対し、ＳｉＯ2 が４．５〜６％でゲ
ーサイト（Ｆｅ2 Ｏ3 ・Ｈ2 Ｏ）を多く含み、ゲーサイ
トがヘマタイトを取り囲んだ魚卵状構造を有しているピ
ソライト鉄鉱石と呼ばれる鉄鉱石がある。これは、オー
ストラリアのローブリバー、ヤンディクージといった銘
柄で代表されるが、埋蔵量が莫大で採掘が容易なので安
価であり、供給が安定している。前述のように、良質な
マグネタイト、ヘマタイト鉱石資源が枯渇する方向にあ
ることを考えると、今後、ピソライト鉄鉱石等の従来必
ずしも良質の資源とは考えられていなかった鉄鉱石を高
炉原料として利用することが検討されなければならな
い。On the other hand, Pisolite having SiO 2 of 4.5 to 6% and containing a large amount of goethite (Fe 2 O 3 .H 2 O) and having a roe-like structure in which goethite surrounds hematite. There is an iron ore called iron ore. This is typified by Australian brands such as Lobe River and Yandy Coogee, but they are inexpensive and stable in supply because they have huge reserves and are easy to mine. As mentioned above, considering that high-quality magnetite and hematite ore resources are being depleted, iron ores such as pisolite iron ore that were not always considered to be good resources in the past will be used as blast furnace raw materials in the future. Must be considered.
【０００５】しかし、ピソライト鉄鉱石のような結晶水
を多く含む鉄鉱石は高炉用原料としては使用しにくい。
なぜなら、粉鉱石を焼結する場合には、結晶水の分解に
熱量を要するだけでなく、結晶水が分解してゲーサイト
部に選択的に大きな亀裂が発生し、鉱石が脆弱なものと
なる。そして、副原料と鉄鉱石との反応により融液が発
生すると、その融液が亀裂の中に浸入して融液部に大き
な気孔が形成され、焼結体の強度が低下し、これを高炉
で使用すると粉化が激しくなる。塊鉱石を直接高炉に装
入する場合にも、結晶水を分解する熱量が余分に必要に
なり、そのため高炉シャフト部の温度の低下を引き起こ
し、これを防ぐためにコークス比が増加し、また、亀裂
による強度の低下、粉化の激化も避けられない。However, iron ores containing a large amount of water of crystallization, such as pisolite iron ores, are difficult to use as raw materials for blast furnaces.
This is because, when powdered ore is sintered, not only does it take a large amount of heat to decompose the water of crystallization, but the water of crystallization is decomposed and large cracks are selectively generated at the goethite part, making the ore fragile. . Then, when a melt is generated by the reaction between the auxiliary raw material and the iron ore, the melt penetrates into the cracks and large pores are formed in the melt portion, the strength of the sintered body is lowered, and this is When used in, powdering becomes severe. Even when the lump ore is charged directly into the blast furnace, an extra amount of heat is required to decompose the water of crystallization, which causes a decrease in the temperature of the shaft part of the blast furnace, and the coke ratio increases to prevent this, and cracking also occurs. It is unavoidable that the strength is reduced and the pulverization is intensified.
【０００６】これに対し、たとえば特開平５−３３９６
５２号公報には、ピソライト鉄鉱石を核粒子とし、その
周囲が２層の付着粉部からなる擬似粒子を製造し、これ
を焼結すれば、ピソライト鉄鉱石を多量に使用しても安
定な焼結操業が可能であると記載されている。また、特
開平６−１１６６５９号公報には、高ゲーサイト鉱石粒
子に炭材粉等を添加し、火格子移動式焼結機の床敷とし
て焼結すれば、高ゲーサイト鉱石が自己緻密化するので
多量使用が可能であると記載されている。さらに、特開
平７−１５０２６０号公報には、ピソライト鉄鉱石に電
磁波を照射して３００〜５００℃に加熱して粉化させる
ことなく脱水すれば、焼結操業成績が向上すると記載さ
れている。On the other hand, for example, Japanese Patent Laid-Open No. 5-3396
In JP-A-52-52, a pseudo particle composed of a pisolite iron ore as a core particle, and the surrounding thereof is composed of two layers of adhering powder portion is manufactured, and when this is sintered, it is stable even if a large amount of the pisolite iron ore is used. It is stated that a sintering operation is possible. Further, in Japanese Unexamined Patent Publication No. 6-16659, high goethite ore is self-densified by adding carbonaceous powder or the like to high goethite ore particles and sintering it as a bedding of a grate moving type sintering machine. Therefore, it is described that a large amount can be used. Further, JP-A-7-150260 describes that if the pisolite iron ore is irradiated with electromagnetic waves and heated to 300 to 500 ° C. for dehydration without pulverization, the sintering operation results are improved.
【０００７】[0007]
【発明が解決しようとする課題】これら従来の技術は、
ピソライト鉄鉱石等を焼結してから高炉製銑法に使用す
る場合に効果を奏するものであるが、焼結工程に先立っ
て新たな設備や処理を必要とする。しかし、結晶水を多
く含む鉄鉱石を高炉製銑法の原料として使用する場合、
必ずしも焼結工程を前提としなくてもよいはずであり、
そのような制約なしに、結晶水を多く含む鉄鉱石の有効
利用を考える方向も検討されるべきである。そこで本発
明は、ピソライト鉄鉱石に代表される結晶水を２．０％
以上と多く含む鉄鉱石を原料として使用して、前述の問
題を生じることなく、高炉生産性を高め、コークス比を
低減することができる高炉操業方法を提供することを目
的とする。SUMMARY OF THE INVENTION These conventional techniques are:
This is effective when the pisolite iron ore or the like is sintered and then used in the blast furnace ironmaking method, but new equipment and treatment are required prior to the sintering step. However, when using iron ore containing a large amount of water of crystallization as a raw material for the blast furnace pig iron method,
It is not necessary to assume the sintering process,
Without such restrictions, the direction for considering the effective utilization of iron ore containing a large amount of water of crystallization should be considered. Therefore, the present invention uses 2.0% of crystal water typified by pisolite iron ore.
It is an object of the present invention to provide a blast furnace operating method capable of increasing blast furnace productivity and reducing the coke ratio without using the above-mentioned problems by using iron ore containing a large amount of the above as a raw material.
【０００８】[0008]
【課題を解決するための手段】本発明は、結晶水を２．
０重量％以上含む鉄鉱石を還元率３０％以上に還元した
後、高炉に装入および／または吹き込むことを特徴とす
る高炉操業方法である。前記鉄鉱石の還元は、４００℃
以上の熱間のＣＯやＨ2 を含む還元性雰囲気下で行うこ
とができる。In the present invention, the water of crystallization is 2.
It is a blast furnace operating method characterized by charging and / or blowing into a blast furnace after reducing iron ore containing 0% by weight or more to a reduction rate of 30% or more. The reduction of the iron ore is 400 ℃
It can be performed in a reducing atmosphere containing the hot CO or H 2 described above.
【０００９】本発明では、結晶水を２．０重量％以上含
む鉄鉱石は焼結工程を経ず、還元してから高炉製銑法の
原料として使用することにした。焼結工程を経ないの
で、前述の問題のうち焼結工程において生じるものは避
けることができる。結晶水の下限を２．０重量％とした
のは、結晶水の量がこれより少ない鉄鉱石は、従来の焼
結工程を経て高炉製銑法に使用しても問題がないからで
ある。In the present invention, iron ore containing 2.0% by weight or more of water of crystallization is used as a raw material for the blast furnace pig iron method after being reduced without undergoing a sintering step. Since the sintering process is not performed, it is possible to avoid the above problems that occur in the sintering process. The lower limit of the amount of water of crystallization is set to 2.0% by weight because iron ore having a smaller amount of water of crystallization can be used in the blast furnace pig iron method after the conventional sintering process.
【００１０】鉄鉱石に含まれる結晶水は、４００℃以上
の熱間雰囲気では酸化鉄から分解して水蒸気になり、除
去される。このとき、雰囲気がＣＯやＨ2 を含む還元性
であれば酸化鉄は還元され、還元が進んで還元率３０％
以上になると金属鉄が出来始める。還元率の下限を３０
％としたのは、３０％未満では金属鉄が出来ず、せいぜ
いＦｅＯの段階であり、金属鉄が存在しなければ高炉使
用時のコークス低減効果が少ないからである。還元率３
０％以上では、還元が進むほど金属鉄の割合が多くな
り、それに応じてコークス比が低減される。なお、還元
率３０％以上では結晶水はほとんど残存していない。還
元率の上限については、１００％還元してから高炉に使
用することももちろん可能ではあるが、還元率の上昇と
ともに還元速度は低下し、特に還元率が９５％以上では
還元鉄の生産性が大幅に低下するため、１００％もしく
はそれに近い還元率は還元鉱の製造に際して不利とな
る。このため、総合的に考えれば半還元鉱石の状態で高
炉に使用することが望ましい。なお、本発明における還
元率とは、金属鉄を１００％、ヘマタイト（Ｆｅ
2 Ｏ3）を０％として定義される。The water of crystallization contained in the iron ore is decomposed from iron oxide into steam in a hot atmosphere of 400 ° C. or higher and removed. At this time, if the atmosphere is reducible containing CO and H 2 , the iron oxide is reduced, and the reduction proceeds to a reduction rate of 30%.
When it is above, metallic iron begins to be formed. The lower limit of the reduction rate is 30
%, The metallic iron cannot be formed at less than 30% and is at the stage of FeO at most, and the coke reduction effect at the time of using the blast furnace is small if metallic iron does not exist. Return rate 3
When it is 0% or more, the proportion of metallic iron increases as the reduction proceeds, and the coke ratio decreases accordingly. When the reduction rate is 30% or more, almost no water of crystallization remains. Regarding the upper limit of the reduction rate, it is of course possible to use it in a blast furnace after reducing it by 100%, but as the reduction rate increases, the reduction rate decreases, and especially when the reduction rate is 95% or more, the productivity of reduced iron decreases. Since the reduction rate is drastically reduced, a reduction rate of 100% or close thereto is disadvantageous in the production of reduced ore. Therefore, from a comprehensive perspective, it is desirable to use semi-reduced ore in a blast furnace. The reduction rate in the present invention means 100% metallic iron, hematite (Fe
2 O 3 ) is defined as 0%.
【００１１】本発明では、還元した鉱石を焼結する必要
はない。塊鉱石であれば、通常の原料とともに炉頂から
炉内に装入するし、粉鉱石であれば、羽口を通して炉内
に吹き込むのである。In the present invention, it is not necessary to sinter the reduced ore. If it is a lump ore, it is charged into the furnace from the furnace top together with the usual raw materials, and if it is a powdered ore, it is blown into the furnace through the tuyere.
【００１２】[0012]
【実施例１】結晶水を４％含む−４ｍｍの粉鉄鉱石を流
動層を用いて還元した。還元には、Ｈ2 ８０％で温度が
７００〜８２０℃の還元ガスを用いた。この際、原料の
供給速度を調節して、還元率１０〜９０％の半還元鉱石
を製造した。製造した半還元鉱石は平均粒度１２０〜４
００μｍ、−１ｍｍ質量比８２〜９４％、結晶水０．２
％以下であり、ランスを介して羽口より高炉に吹き込ん
だ。吹き込んだ半還元鉱石の重量原単位は、１００ｋｇ
／ｔ−溶銑で一定とした。Example 1 A -4 mm powdered iron ore containing 4% of water of crystallization was reduced using a fluidized bed. For the reduction, a reducing gas with H 2 80% and a temperature of 700 to 820 ° C. was used. At this time, the feed rate of the raw material was adjusted to produce a semi-reduced ore with a reduction rate of 10 to 90%. The produced semi-reduced ore has an average particle size of 120 to 4
00 μm, -1 mm mass ratio 82-94%, crystal water 0.2
% Or less, and was blown into the blast furnace from the tuyere via the lance. The basic unit of weight of the blown semi-reduced ore is 100 kg.
/ T-constant with hot metal.
【００１３】[0013]
【実施例２】結晶水を７％含む平均粒径１４ｍｍの塊鉱
石をシャフト炉を用いて還元した。還元には、天然ガス
を改質したＨ2 ５０％、ＣＯ３５％で温度が８５０℃の
還元ガスを用いた。この際、成品の排出速度を調節し
て、還元率１０〜９０％の半還元鉱石を製造した。製造
した半還元鉱石はいずれも結晶水０．３％以下であり、
通常の原料に混入して炉頂より炉内に装入した。装入し
た半還元鉱石の重量原単位は、２００ｋｇ／ｔ−溶銑で
一定とした。Example 2 A lump ore containing 7% of water of crystallization and having an average particle diameter of 14 mm was reduced using a shaft furnace. For the reduction, a reducing gas obtained by reforming natural gas with H 2 50% and CO 35% and a temperature of 850 ° C. was used. At this time, the discharge rate of the product was adjusted to produce a semi-reduced ore with a reduction rate of 10 to 90%. Each of the manufactured semi-reduced ores has a crystal water of 0.3% or less,
It was mixed with normal raw materials and charged into the furnace from the top of the furnace. The weight basic unit of the charged semi-reduced ore was constant at 200 kg / t-hot metal.
【００１４】実施例１および実施例２について、コーク
ス比の低減状況を図１に示す。なお、参考のため、両鉱
石について、還元および脱水せずに高炉に吹き込み、ま
たは装入した例と、還元せずに脱水のみして高炉に吹き
込み、または装入した例とを、還元率０％として示し
た。FIG. 1 shows how the coke ratio is reduced in the first and second embodiments. For reference, both of the ores were blown or charged into the blast furnace without reduction and dehydration, and an example in which the ore was blown or charged into the blast furnace without dehydration and reduced. Shown as a percentage.
【００１５】図１から、還元率３０％以上でコークス比
低減の効果が現れていることがわかる。また、使用した
半還元鉱石の重量原単位の大きい方がその効果は大きく
なることがわかり、その使用原単位は原料の需給バラン
スやコストなどの観点から操業者が決定すればよく、必
要であれば原料の全量を半還元鉱石としても差し支えな
い。From FIG. 1, it can be seen that the effect of reducing the coke ratio appears when the reduction rate is 30% or more. It was also found that the larger the basic unit of weight of the semi-reduced ore used, the greater the effect, and the basic unit to be used may be determined by the operator from the viewpoints of supply and demand balance of raw materials, cost, etc. For example, the entire amount of raw material may be semi-reduced ore.
【００１６】[0016]
【発明の効果】本発明により、埋蔵量が莫大で安価であ
り、供給が安定している結晶水を２．０重量％以上含む
鉄鉱石を高炉製銑法の原料として用い、かつ高炉生産性
を高め、コークス比を低減することが可能となる。According to the present invention, iron ore containing 2.0% by weight or more of crystallization water, which has a huge reserve, is inexpensive, and has a stable supply, is used as a raw material for the blast furnace ironmaking process, and the blast furnace productivity is improved. And the coke ratio can be reduced.
【図１】結晶水を２．０重量％以上含む鉄鉱石を還元し
て製造した半還元鉱石の還元率とこれを高炉製銑法の原
料として使用した場合のコークス比との関係を示す図で
ある。FIG. 1 is a diagram showing the relationship between the reduction rate of a semi-reduced ore produced by reducing iron ore containing 2.0% by weight or more of water of crystallization and the coke ratio when this is used as a raw material for a blast furnace ironmaking process. Is.
Claims (2)
還元率３０％以上に還元した後、高炉に装入および／ま
たは吹き込むことを特徴とする高炉操業方法。1. A method of operating a blast furnace, which comprises reducing iron ore containing 2.0% by weight or more of water of crystallization to a reduction rate of 30% or more, and then charging and / or blowing the iron ore into a blast furnace.
性雰囲気下で還元する請求項１記載の高炉操業方法。2. The blast furnace operating method according to claim 1, wherein the iron ore is reduced in a hot reducing atmosphere at 400 ° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7346956A JPH09165607A (en) | 1995-12-14 | 1995-12-14 | Blast furnace operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7346956A JPH09165607A (en) | 1995-12-14 | 1995-12-14 | Blast furnace operation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09165607A true JPH09165607A (en) | 1997-06-24 |
Family
ID=18386963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7346956A Pending JPH09165607A (en) | 1995-12-14 | 1995-12-14 | Blast furnace operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09165607A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011058097A (en) * | 2010-12-21 | 2011-03-24 | Nippon Steel Corp | Blast furnace operation method |
| WO2020196769A1 (en) | 2019-03-28 | 2020-10-01 | 株式会社神戸製鋼所 | Blast furnace operation method |
-
1995
- 1995-12-14 JP JP7346956A patent/JPH09165607A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011058097A (en) * | 2010-12-21 | 2011-03-24 | Nippon Steel Corp | Blast furnace operation method |
| WO2020196769A1 (en) | 2019-03-28 | 2020-10-01 | 株式会社神戸製鋼所 | Blast furnace operation method |
| KR20210141661A (en) | 2019-03-28 | 2021-11-23 | 가부시키가이샤 고베 세이코쇼 | How to operate a blast furnace |
| US12565688B2 (en) | 2019-03-28 | 2026-03-03 | Kobe Steel, Ltd. | Method for operation of blast furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1516744B (en) | Method for preparing metal agglomerates | |
| JPS5910962B2 (en) | Method for manufacturing pig iron using pre-reduced iron ore | |
| CN113416838B (en) | Method for preparing fluxed carbon-containing low-titanium pellets by using large-particle-size iron ore powder | |
| JP3344151B2 (en) | Sinter production method | |
| CN116814952B (en) | A method for collaborative treatment of electric furnace smelting solid waste | |
| JP2005325373A (en) | Casting method of iron powder for magnetic materials | |
| JP4173925B2 (en) | Blast furnace operation method | |
| EP1252348B1 (en) | Iron-nickel alloy production | |
| US5698009A (en) | Method for agglomerating pre-reduced hot iron ore particles to produce ingot iron | |
| US2674531A (en) | Iron recovery | |
| JP2000034526A (en) | Method for producing reduced iron pellets | |
| JP4997712B2 (en) | Blast furnace operation method | |
| US3202503A (en) | Production of high quality steel from iron sand | |
| JP4149080B2 (en) | Method for producing raw material for iron making, raw material for iron making, and method for operating blast furnace | |
| US4898712A (en) | Two-stage ferrosilicon smelting process | |
| JP4599736B2 (en) | Granulation method of sintering raw material | |
| JP4379097B2 (en) | Pseudoparticles for sintering and method for producing the same | |
| JP4175158B2 (en) | Method for manufacturing raw materials for sintering | |
| JP2589627B2 (en) | Production method of sinter for pig iron making from pisolite iron ore | |
| JP3848453B2 (en) | Manufacturing method of metallic iron | |
| JP3522553B2 (en) | Blast furnace raw material charging method | |
| JP2000119722A (en) | Method for producing reduced iron pellets | |
| CN107619902A (en) | The technique that a kind of electric furnace converts hot metal charging injection blast furnace dust | |
| JPH08253801A (en) | How to use blast furnace of reduced ore | |
| JPH09137208A (en) | Blast furnace charging method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20020213 |