JPH09194914A - Blast furnace operation method when a large amount of pulverized coal is injected - Google Patents
Blast furnace operation method when a large amount of pulverized coal is injectedInfo
- Publication number
- JPH09194914A JPH09194914A JP15746996A JP15746996A JPH09194914A JP H09194914 A JPH09194914 A JP H09194914A JP 15746996 A JP15746996 A JP 15746996A JP 15746996 A JP15746996 A JP 15746996A JP H09194914 A JPH09194914 A JP H09194914A
- Authority
- JP
- Japan
- Prior art keywords
- blast furnace
- mass
- pulverized coal
- sinter
- large amount
- 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.)
- Granted
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- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
Abstract
(57)【要約】
【課題】 微粉炭多量吹き込み時の高炉操業安定化させ
る。
【解決手段】 微粉炭吹き込み量を１５０ｋｇ／ｔ−ｐ
以上の高炉操業において、鉄鉱石、石灰石、コークス、
蛇紋岩、珪石（珪砂）を主成分とする焼結原料のうち、
粒度１ｍｍ以下の粒子を７５ｍａｓｓ％以上含む珪石
（珪砂）を新原料中０．１％以上１．０％以下配合して
製造したＳｉＯ2 が４．２〜４．９ｍａｓｓ％、ＭｇＯ
が０．５〜１．２ｍａｓｓ％の微細気孔の多い焼結鉱を
高炉に装入して、高温還元性を向上させることにより、
軟化融着帯の幅が薄くなるように制御して微粉炭多量吹
き込みを安定化させる。
(57) [Abstract] [Problem] To stabilize the operation of a blast furnace when a large amount of pulverized coal is injected. SOLUTION: The amount of pulverized coal blown is 150 kg / tp
In the above blast furnace operation, iron ore, limestone, coke,
Of the sintering raw materials whose main components are serpentine and silica stone (silica sand),
SiO 2 is 4.2～4.9Mass% prepared by blending silica (sand) below 1.0% 0.1% or more in the new feed containing the following particle size 1mm above 75 mass%, MgO
By adding a sinter having many fine pores of 0.5 to 1.2 mass% to the blast furnace to improve the high temperature reducibility,
The blowing of a large amount of pulverized coal is stabilized by controlling the width of the softening cohesive zone to be thin.
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、高炉に高温還元
性を向上させた焼結鉱を装入して、軟化融着帯の幅が薄
くなるように制御し、これによって微粉炭多量吹き込み
時の高炉操業安定化を狙った高炉操業方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention charges a blast furnace with a sinter having improved high-temperature reducibility, and controls so that the width of the softening cohesive zone becomes thin. Blast furnace operation method aiming at stabilization of blast furnace operation.
【０００２】[0002]
【従来の技術】コークスとの代替により溶銑原価低減効
果が大きく、コークス炉の老朽化対策としても重要な微
粉炭吹き込みが最近注目され、日本国内ではほぼ全高炉
に採用されている。例えば「材料とプロセス」７（１９
９４），ｐ１２４には、微粉炭比１８０ｋｇ／ｔ−ｐ以
上の吹き込み操業を装入物分布の改善（シャープな逆Ｖ
型の融着帯を維持）と羽口前条件の改善により安定に継
続している結果が報告されている。また、同じく「材料
とプロセス」７（１９９４），ｐ１２６には、１週間に
わたる微粉炭比２００ｋｇ／ｔ−ｐの操業試験結果が報
告され、コークスＤＩ（強度）の向上と高酸素富化操
業、低Ａｌ2 Ｏ3 ・高被還元性焼結鉱の使用、局所的な
高Ｏ／Ｃ部を形成させない装入物分布制御により達成し
た内容が記載されている。2. Description of the Related Art The replacement of coke has a great effect of reducing the cost of hot metal, and blowing pulverized coal, which is important as a countermeasure against the deterioration of coke ovens, has recently attracted attention and has been adopted in almost all blast furnaces in Japan. For example, “Materials and Processes” 7 (19
94), p124, a blasting operation with a pulverized coal ratio of 180 kg / tp or more was performed to improve the charge distribution (sharp reverse V
It is reported that the results continue to be stable by maintaining the cohesive zone of the mold) and improving the pre-tuyere conditions. Also, in “Materials and Processes” 7 (1994), p126, the operation test results of a pulverized coal ratio of 200 kg / tp for one week are reported, and improvement of coke DI (strength) and high oxygen enrichment operation, The contents achieved by the use of low Al 2 O 3 / highly reducible sinter ore and the control of the distribution of the charge without forming a local high O / C portion are described.
【０００３】ここでは、融着帯の厚み増加による炉下部
通気性悪化を抑制するために、低Ａｌ2 Ｏ3 ・高被還元
性焼結鉱を使用したと報告していることから、装入物の
低Ａｌ2 Ｏ3 化で融着帯の厚み増加を抑制したと考えら
れる。さらに「材料とプロセス」８（１９９５），ｐ３
１９には、月間の微粉炭比２１８ｋｇ／ｔ−ｐの操業結
果として、炉下部通気通液性の改善のためにスラグ比の
低減（３２０→２８０ｋｇ／ｔ−ｐ）と塊成鉱の高ＲＩ
（被還元性）化（ＨＰＳの全面使用）、コークス強度の
向上を実施したことなどが報告されている。ＨＰＳ鉱が
低ＳｉＯ2 ・低Ａｌ2 Ｏ3 鉱であるのはよく知られたこ
とで、融着帯の厚み増加を装入物の低ＳｉＯ2 化と低Ａ
ｌ2 Ｏ3 化で抑制したと考えられる。Here, since it is reported that low Al 2 O 3 / highly reducible sinter is used in order to suppress deterioration of the air permeability of the lower part of the furnace due to an increase in the thickness of the cohesive zone, It is considered that the increase in the thickness of the cohesive zone was suppressed by reducing the Al 2 O 3 content of the material. Furthermore, "Materials and Processes" 8 (1995), p3
In Fig. 19, as a result of the monthly pulverized coal ratio of 218 kg / tp, the slag ratio was reduced (320 → 280 kg / tp) and the high RI of agglomerated ore was improved to improve the ventilation permeability of the lower part of the furnace.
It has been reported that (reducible) (using the entire surface of HPS) and improving coke strength were carried out. It is well known that HPS ore is a low SiO 2 and low Al 2 O 3 ore, and it is possible to increase the thickness of the cohesive zone by reducing the SiO 2 content and the A content of the charge.
It is considered that this was suppressed by conversion into l 2 O 3 .
【０００４】[0004]
【発明が解決しようとする課題】微粉炭吹き込み操業に
おいて、微粉炭を多量に吹き込むためには次の技術課題
を解決していく必要があると考える。すなわち、 微粉炭比増加によりコークス量が減少（コークスス
リットの縮小）するので、鉱石／コークス比（Ｏ／Ｃ）
が高くなり、これによって融着帯の厚みが増加するとと
もに、その下に位置する炉下部の通気性が悪化するこ
と、 羽口における微粉炭燃焼量が増加するため、ガス流
れが周辺流化し、炉体からの放散熱が増加して熱効率が
低下すること、 熱流比（固体熱容量／ガス熱容量）の低下により炉
内ガス温度が上昇するので、炉頂からのガス顕熱が増加
し、これによって熱効率が低下すること、などである。It is considered necessary to solve the following technical problems in order to blow a large amount of pulverized coal in the pulverized coal blowing operation. In other words, the amount of coke decreases (coke slit shrinks) as the pulverized coal ratio increases, so the ore / coke ratio (O / C)
, Which increases the thickness of the cohesive zone, deteriorates the air permeability of the lower part of the furnace located below it, and increases the amount of pulverized coal combustion at the tuyere, causing the gas flow to flow to the peripheral flow, Since the heat dissipated from the furnace body increases, the thermal efficiency decreases, and the heat flow ratio (solid heat capacity / gas heat capacity) decreases, the gas temperature inside the furnace rises, so the sensible heat of gas from the furnace top increases, which causes Thermal efficiency is reduced, and so on.
【０００５】微粉炭比が１５０ｋｇ／ｔ−ｐ以上になる
と、装入物の荷下がり悪化や圧力損失、炉体熱負荷増な
どにより操業が不安定になることが他に報告されてお
り、これらの技術課題の解決は重要と考える。その中で
も特に、微粉炭比増加で鉱石／コークス比（Ｏ／Ｃ）が
高くなり、これによって融着帯の厚みが増加することは
問題が大きいと考える。炉下部の圧力損失が増加すると
同時にガスの中心流れが抑制されて周辺流が助長される
ので、荷下がりが不安定になり炉体熱負荷が増大する。It has been reported that when the pulverized coal ratio is 150 kg / tp or more, the operation becomes unstable due to deterioration of the load unloading, pressure loss, and increase in heat load on the furnace body. It is important to solve the above technical problems. Especially, it is considered that the increase of the pulverized coal ratio raises the ore / coke ratio (O / C), which increases the thickness of the cohesive zone. At the same time as the pressure loss in the lower part of the furnace increases, the central flow of gas is suppressed and the peripheral flow is promoted, so that the unloading becomes unstable and the heat load on the furnace body increases.
【０００６】ところが、Ｏ／Ｃが高くなることによる融
着帯の厚み増加とその下に位置する炉下部の通気性悪化
と、それに対する装入物の改善策については、すでに説
明したように、装入物の低Ａｌ2 Ｏ3 化（１．７ｍａｓ
ｓ％未満）を実施した例が見られる程度である。しか
し、１９９４年の日本鉄鋼業全体の焼結鉱中のＡｌ2 Ｏ
3 の平均値は１．７５〜１．８５ｍａｓｓ％の範囲にあ
り、今後も焼結鉱中のＡｌ2 Ｏ3 は徐々に増加していく
ことが予想される。従って、多くの高炉が長期的に低Ａ
ｌ2 Ｏ3 焼結鉱を製造し、これを使用していこうとする
のは困難であると考えられる。However, as described above, the increase in the thickness of the cohesive zone due to the increase in O / C, the deterioration of the air permeability of the lower part of the furnace located thereunder, and the measures for improving the charge against it are as described above. Low Al 2 O 3 content (1.7mas)
(less than s%) is observed. However, Al 2 O in the sinter ore of the entire Japanese steel industry in 1994
The average value of 3 is in the range of 1.75 to 1.85 mass%, and it is expected that Al 2 O 3 in the sinter will gradually increase in the future. Therefore, many blast furnaces have low A
to produce a l 2 O 3 sinter, considered it is difficult to let use this.
【０００７】一方、特開平６−１００９１１号公報に
は、微粉炭吹き込み高炉操業において、微粉炭吹き込み
量を１５０ｋｇ／ｔ−ｐ以上、投入水素量を１５〜２０
ｋｇ／ｔ−ｐとし、さらに酸素を３〜５％富化すること
を特徴とする微粉炭多量吹き込み時の高炉操業方法が記
載されている。水蒸気吹込み量の増加と酸素富化により
融着帯を逆Ｖ字形に変化させて通気性を改善する方法で
あるが、水蒸気と酸素を別々に製造して高炉に吹き込む
ため、高炉操業コストが大幅に上昇する欠点がある。On the other hand, Japanese Patent Laid-Open No. 6-100911 discloses that in a blast furnace operation in which pulverized coal is blown, the amount of pulverized coal blown is 150 kg / tp or more and the amount of hydrogen fed is 15 to 20.
It describes a blast furnace operating method at the time of blowing a large amount of pulverized coal, which is characterized in that it is set to kg / tp and that oxygen is enriched by 3 to 5%. This is a method to improve the air permeability by changing the cohesive zone into an inverted V shape by increasing the amount of steam injected and enriching oxygen, but since steam and oxygen are manufactured separately and blown into the blast furnace, the blast furnace operating cost is reduced. It has the drawback of rising significantly.
【０００８】また特開昭６１−５６２１１号公報には、
高炉操業において装入する焼結鉱の塩基度を２以上と
し、高炉スラグの目標塩基度よりも高くなった分は高炉
にてＳｉＯ2 源副原料を装入することにより調整すると
ともに、軟化融着帯のレベルを下降させることにより溶
銑中Ｓｉ濃度を低下させることを特徴とする高炉操業方
法が記載されている。この方法は、高温性状に優れた塩
基度の高い焼結鉱を用いることにより、軟化融着帯の収
縮率や通気抵抗を改善しているが、高炉スラグ量を増加
させる欠点があるので、炉下部の通気性改善を必要とす
る微粉炭多量吹き込み操業への適用は困難である。Further, Japanese Patent Application Laid-Open No. 61-56211 discloses that
The basicity of the sinter charged in the blast furnace operation is set to 2 or more, and the amount that becomes higher than the target basicity of the blast furnace slag is adjusted by charging the SiO 2 source auxiliary raw material in the blast furnace and softening and melting. A blast furnace operating method is described which is characterized in that the Si concentration in the hot metal is lowered by lowering the landing level. This method improves the shrinkage rate and the ventilation resistance of the softening cohesive zone by using a sinter having a high basicity and excellent in high-temperature properties, but it has the drawback of increasing the amount of blast furnace slag. It is difficult to apply to the operation in which a large amount of pulverized coal is injected, which requires improvement of the air permeability of the lower part.
【０００９】本発明は、上記のような問題点を解決する
ためになされたもので、装入物のみに着目して高炉内に
形成される融着帯の通気性を大幅に改善することを狙っ
ている。すなわち、微細気孔の多い低スラグ焼結鉱を高
炉に装入して高温還元を促進し、軟化融着帯の幅が従来
よりも薄くなるように制御可能な微粉炭多量吹き込み時
の高炉操業方法を提供することを目的とする。The present invention has been made in order to solve the above-mentioned problems, and it is intended to significantly improve the air permeability of the cohesive zone formed in the blast furnace by focusing on only the charging material. I'm aiming. That is, a low-slag sinter having many fine pores is charged into a blast furnace to promote high-temperature reduction, and the width of the softening cohesive zone can be controlled so as to be thinner than in the conventional method. The purpose is to provide.
【００１０】[0010]
【課題を解決するための手段】本発明では、具体的に以
下のような手段によって上記目的を達成する。 （１）１５０ｋｇ／ｔ−ｐ以上の微粉炭を羽口から高炉
に吹き込む際に、１ｍｍ以下の粒度を７５ｍａｓｓ％以
上とした珪石を０．１〜１．０ｍｍｍａｓｓ％、その他
を鉄鉱石、石灰石、蛇紋岩として配合した新原料に、コ
ークスを配合して、ＳｉＯ2 を４．２〜４．９ｍａｓｓ
％、ＭｇＯを０．５〜１．２ｍａｓｓ％に調整して製造
した焼結鉱を高炉に装入して操業することを特徴とする
微粉炭多量吹き込み時の高炉操業方法。 （２）１５０ｋｇ／ｔ−ｐ以上の微粉炭を羽口から高炉
に吹き込む際に、１ｍｍ以下の粒度を７５ｍａｓｓ％以
上とした珪石を０．１〜１．０ｍｍｍａｓｓ％、その他
を鉄鉱石、石灰石、蛇紋岩として配合して新原料に、コ
ークスを配合して、ＦｅＯを４．５〜６．５ｍａｓｓ
％、ＳｉＯ2 を３．９〜４．９ｍａｓｓ％、ＭｇＯを
０．５〜１．２ｍａｓｓ％に調整して製造した焼結鉱を
高炉に装入して操業することを特徴とする微粉炭多量吹
き込み時の高炉操業方法。In the present invention, the above object is specifically achieved by the following means. (1) When blowing pulverized coal of 150 kg / tp or more into the blast furnace from the tuyere, 0.1 to 1.0 mmmass% of silica stone having a particle size of 1 mm or less of 75 mass% or more, iron ore, limestone, etc. Coke was added to the new raw material that was blended as serpentine, and SiO 2 was 4.2 to 4.9 mass.
%, MgO adjusted to 0.5 to 1.2 mass%, and operated by charging a sinter produced by blast furnace into a blast furnace. (2) When blowing 150 kg / tp or more of pulverized coal from the tuyere into the blast furnace, 0.1 to 1.0 mmmass% silica stone having a particle size of 1 mm or less of 75 mass% or more, and iron ore, limestone, etc. Blended as a serpentine, blended with a new raw material, coke, and made FeO 4.5 to 6.5 mass.
%, SiO 2 of 3.9 to 4.9 mass% and MgO of 0.5 to 1.2 mass%, and the sinter produced by the blast furnace is charged into a blast furnace for operation. Blast furnace operation method at the time of blowing.
【００１１】（３）粒度１．０〜３．０ｍｍの粒子また
は造粒物を５０〜１００ｍａｓｓ％含む石灰石を新原料
に配合して製造した焼結鉱を高炉に装入することを特徴
とする（１）または（２）に記載の微粉炭多量吹き込み
時の高炉操業方法。 （４）粒度０．５〜１．５ｍｍの粒子または造粒物を５
０〜１００ｍａｓｓ％含むコークスを焼結原料に配合し
て製造した焼結鉱を高炉に装入することを特徴とする
（１）〜（３）のいずれかに記載の微粉炭多量吹き込み
時の高炉操業方法。 （５）結晶水を５ｍａｓｓ％以上含む鉄鉱石を焼結新原
料中に２５ｍａｓｓ％以上配合して製造した焼結鉱を高
炉に装入することを特徴とする（１）〜（４）のいずれ
かに記載の微粉炭多量吹き込み時の高炉操業方法。(3) A sinter produced by mixing limestone containing 50 to 100 mass% of particles or granules having a particle size of 1.0 to 3.0 mm with a new raw material is charged into a blast furnace. The method for operating a blast furnace at the time of blowing a large amount of pulverized coal according to (1) or (2). (4) Particles having a particle size of 0.5 to 1.5 mm or a granulated product should be 5
A blast furnace at the time of blowing a large amount of pulverized coal according to any one of (1) to (3), characterized in that a sinter produced by mixing coke containing 0 to 100 mass% with a sintering raw material is charged into the blast furnace. Operating method. (5) A sinter ore produced by mixing 25 mass% or more of iron ore containing 5 mass% or more of water of crystallization in a new raw material for sintering is charged into a blast furnace. (1) to (4) A method for operating a blast furnace when a large amount of pulverized coal as described in Crab is blown.
【００１２】燃料比が５００ｋｇ／ｔ−ｐの前提で、微
粉炭比が１５０ｋｇ／ｔ−ｐ（従ってコークス比は３５
０ｋｇ／ｔ−ｐ）まで増加すると、鉱石／コークス比
（Ｏ／Ｃ）は４．５レベルに上昇する。さらに、微粉炭
比が２００ｋｇ／ｔ−ｐ（従ってコークス比は３００ｋ
ｇ／ｔ−ｐ）になると、Ｏ／Ｃは５．５まで上昇する。
通常操業のＯ／Ｃは４．０未満であるので、微粉炭比１
５０ｋｇ／ｔ−ｐ以上では鉱石層厚が大幅に増加するこ
とになり、融着帯形状が肥大化することになる。Assuming a fuel ratio of 500 kg / tp, a pulverized coal ratio of 150 kg / tp (thus a coke ratio of 35).
0 kg / tp), the ore / coke ratio (O / C) rises to the 4.5 level. Furthermore, the pulverized coal ratio is 200 kg / tp (so the coke ratio is 300 k
g / tp), O / C rises to 5.5.
O / C in normal operation is less than 4.0, so pulverized coal ratio is 1
If it is 50 kg / tp or more, the ore layer thickness will be significantly increased, and the shape of the cohesive zone will be enlarged.
【００１３】図１に微粉炭比６０ｋｇ／ｔ−ｐ（ａ）お
よび２００ｋｇ／ｔ−ｐ（ｂ）吹き込み操業でのシミュ
レーション結果に基づく高炉内融着帯形状の変化を示
す。微粉炭比が増加すると融着帯が肥大化しているのが
分かる。この融着帯の肥大化を抑制できれば炉内通気性
は改善される。本発明は焼結鉱の微細気孔の増加と低ス
ラグ化により、高炉内の融着帯の幅を薄く制御して微粉
炭多量吹き込み操業を可能にする操業を行うものであ
る。FIG. 1 shows changes in the shape of the cohesive zone in the blast furnace based on the simulation results in the pulverized coal ratio 60 kg / tp (a) and 200 kg / tp (b) blowing operation. It can be seen that the cohesive zone is enlarged as the pulverized coal ratio increases. If the enlargement of the cohesive zone can be suppressed, the air permeability in the furnace will be improved. According to the present invention, by increasing the fine pores of the sinter and reducing the slag, the width of the cohesive zone in the blast furnace is controlled to be thin so that a large amount of pulverized coal can be injected.
【００１４】まず、ＳｉＯ2 成分が４．２〜４．９ｍａ
ｓｓ％、ＭｇＯ成分が０．５〜１．２ｍａｓｓ％の範囲
にある焼結鉱は、融液量が少なく、従って、焼結鉱内に
形成される微細気孔は集合することなく均一に分散する
ことを見出した。さらに、ＦｅＯ成分が４．５〜６．５
ｍａｓｓ％、ＳｉＯ2 成分が３．９〜４．９ｍａｓｓ
％、ＭｇＯ成分が０．５〜１．２ｍａｓｓ％の範囲であ
れば、融液量が少ないにもかかわらず、焼結鉱のＳＩ
（落下強度、ＪＩＳＭ８７１１により測定）およびその
製造時の歩留りを低下させることなく、微細気孔が均一
に分散した焼結鉱の製造が可能なことも見出した。First, the SiO 2 component is 4.2 to 4.9 ma.
Sintered ore containing ss% and MgO components in the range of 0.5 to 1.2 mass% has a small amount of melt, and therefore fine pores formed in the sintered ore are dispersed uniformly without aggregation. I found that. Further, the FeO component is 4.5 to 6.5.
mass%, SiO 2 component is 3.9 to 4.9 mass
%, If the MgO component is in the range of 0.5 to 1.2 mass%, the SI of the sintered ore is obtained despite the small amount of melt.
It was also found that it is possible to manufacture a sintered ore in which fine pores are uniformly dispersed (falling strength, measured by JISM8711) and without lowering the yield during the manufacturing.
【００１５】さらに、粒度１．０〜３．０ｍｍの粒子ま
たは造粒物を５０〜１００ｍａｓｓ％含む石灰石を配合
したり、粒度０．５〜１．５ｍｍの粒子または造粒物を
５０〜１００ｍａｓｓ％含むコークスを配合したりする
ことにより、焼結鉱内に形成される微細気孔が均一に分
散することに加えて、焼結鉱の還元粉化（ＲＤＩ）を抑
制できる結果を得た。また、結晶水を５ｍａｓｓ％以上
含む鉄鉱石は結晶水が抜けたあとに微細気孔を生成する
が、新原料中２５ｍａｓｓ％以上この鉄鉱石を配合する
ことにより微細気孔の生成がより顕著になることも見出
した。Further, limestone containing 50 to 100 mass% of particles or granules having a particle size of 1.0 to 3.0 mm is blended, or 50 to 100 mass% of particles or granules having a particle size of 0.5 to 1.5 mm. By adding the coke containing, the fine pores formed in the sintered ore were uniformly dispersed, and the reduction pulverization (RDI) of the sintered ore was suppressed. In addition, iron ores containing 5 mass% or more of crystal water generate fine pores after the water of crystal is removed. However, by adding 25 mass% or more of iron ore in the new raw material, the formation of fine pores becomes more remarkable. Also found.
【００１６】一方、焼結鉱成分のＳｉＯ2 とＭｇＯを同
時に低減すると焼結鉱の還元粉化指数（ＲＤＩ）は上昇
して悪化するが、粒度１ｍｍ以下の粒子を７５ｍａｓｓ
％以上含む珪石（珪砂）を新原料中０．１〜１．０ｍａ
ｓｓ％配合することにより、ＲＤＩの悪化を防止できる
ことも見出した。この方法に、上記の方法、すなわち粒
度１．０〜３．０ｍｍの粒子または造粒物を５０〜１０
０ｍａｓｓ％含む石灰石を配合したり、粒度０．５〜
１．５ｍｍの粒子または造粒物を５０〜１００ｍａｓｓ
％含むコークスを配合したりする方法を組み合わせる
と、さらにＲＤＩの悪化を抑制できることも明らかにし
た。本発明は、このような知見に基づき成したものであ
る。On the other hand, if SiO 2 and MgO, which are components of the sinter, are simultaneously reduced, the reduction powdering index (RDI) of the sinter increases and deteriorates, but particles having a particle size of 1 mm or less are 75 mass.
% New silica containing 0.1% to 1.0 ma of silica stone (silica sand)
It was also found that the incorporation of ss% can prevent deterioration of RDI. In this method, the above-mentioned method, that is, particles or granules having a particle size of 1.0 to 3.0 mm are added to 50 to 10
Blended with limestone containing 0 mass%, particle size 0.5 ~
50 to 100 mass of 1.5 mm particles or granulated material
It was also clarified that the deterioration of RDI can be further suppressed by combining the method of blending coke containing 100% of Coke. The present invention is based on such findings.
【００１７】[0017]
【発明の実施の形態】まず、微細気孔が多くＲＤＩの良
好な低スラグ焼結鉱の製造試験結果について述べる。焼
結鉱は５００ｍ2 の焼結機で製造した。従来用いられて
いる焼結鉱と本発明で用いる焼結鉱を比較するために、
水銀圧入法により測定した微細気孔分布の測定結果、還
元粉化指数（ＲＤＩ）、落下強度（ＳＩ，ＪＩＳＭ８７
１１）の測定結果を表１に、高温性状測定結果を図２に
示す。本発明で用いる焼結鉱は微細気孔が多く、低スラ
グ化の効果も加味されて高温還元性と軟化溶融性状が大
幅に改善されているのが分かる。すなわち、本発明で用
いる焼結鉱は、低ＳｉＯ2 かつ低ＭｇＯが特徴であり、
焼結鉱のＳｉＯ2 成分を４．２〜４．９ｍａｓｓ％、Ｍ
ｇＯ成分を０．５〜１．２ｍａｓｓ％の範囲に維持すれ
ば、焼結鉱の微細気孔を増加できることを見出した。BEST MODE FOR CARRYING OUT THE INVENTION First, the production test results of a low slag sinter having many fine pores and a good RDI will be described. The sinter was produced on a 500 m 2 sinter machine. In order to compare the conventionally used sinter and the sinter used in the present invention,
Measurement result of fine pore distribution measured by mercury porosimetry, reduction pulverization index (RDI), drop strength (SI, JISM87
The measurement result of 11) is shown in Table 1, and the high temperature property measurement result is shown in FIG. It can be seen that the sintered ore used in the present invention has many fine pores, and the effect of lowering the slag is also added, and the high temperature reducing property and the softening and melting property are significantly improved. That is, the sinter used in the present invention is characterized by low SiO 2 and low MgO,
The SiO 2 component of the sinter is 4.2 to 4.9 mass%, M
It has been found that the fine pores of the sinter can be increased by maintaining the gO component in the range of 0.5 to 1.2 mass%.
【００１８】一方、ＳｉＯ2 成分が４．２ｍａｓｓ％未
満になると、融液量の減少により焼結鉱製造時の歩留り
低下が顕著になり、４．９ｍａｓｓ％超になると、融液
量の増加で微細気孔が少なくなる傾向が見られた。ま
た、ＭｇＯ成分が１．２ｍａｓｓ％以下では、１．２ｍ
ａｓｓ％超に比べて強度、歩留りとも顕著に上昇してい
くが、０．５ｍａｓｓ％未満になると、その効果が頭打
ちになる傾向が見られた。On the other hand, when the SiO 2 component is less than 4.2 mass%, the yield of the sintered ore is significantly reduced due to the decrease of the melt amount, and when it exceeds 4.9 mass%, the melt amount is increased. There was a tendency that the number of fine pores decreased. If the MgO content is 1.2 mass% or less, 1.2 m
Although the strength and the yield are remarkably increased as compared with the case where the content is more than ass%, the effect tends to reach the limit when the content is less than 0.5 mass%.
【００１９】また、ＳｉＯ2 成分が３．９〜４．９ｍａ
ｓｓ％、ＭｇＯ成分が０．５〜１．２ｍａｓｓ％の範囲
では、ＦｅＯ成分が４．５ｍａｓｓ％未満になると、焼
結鉱の微細気孔はより多くなるものの、熱量不足から融
液量が減少して焼結鉱の強度およびその製造時の歩留り
の維持が困難となり、ＦｅＯ成分が６．５ｍａｓｓ％超
になると、強度と歩留りは維持されるものの、微細気孔
が減少する傾向にあった。すなわち、焼結鉱のＦｅＯ成
分を４．５〜６．５ｍａｓｓ％、ＳｉＯ2 成分を３．９
〜４．９ｍａｓｓ％、ＭｇＯ成分を０．５〜１．２ｍａ
ｓｓ％の範囲に維持すれば、焼結鉱の強度およびその製
造時の歩留りを維持しながら、微細気孔の多い焼結鉱が
製造できることが分かった。Further, the SiO 2 component is 3.9 to 4.9 ma.
In the range of ss% and MgO component of 0.5 to 1.2 mass%, when the FeO component is less than 4.5 mass%, the fine pores of the sintered ore increase, but the amount of melt decreases due to insufficient heat quantity. As a result, it becomes difficult to maintain the strength of the sinter and the yield at the time of its production. When the FeO component exceeds 6.5 mass%, the strength and the yield are maintained, but the fine pores tend to decrease. That is, the FeO component of the sintered ore is 4.5 to 6.5 mass% and the SiO 2 component is 3.9.
~ 4.9mass%, 0.5 ~ 1.2ma MgO component
It was found that by maintaining the ss% range, it is possible to produce a sinter having many fine pores while maintaining the strength of the sinter and the yield at the time of its production.
【００２０】焼結鉱成分のＳｉＯ2 とＭｇＯのレベルを
同時に低下させると、還元粉化指数（ＲＤＩ）が悪化す
るのはよく知られているが、本発明の焼結鉱は、粒度１
ｍｍ以下の粒子を７５ｍａｓｓ％以上含む微粉珪石（珪
砂）を０．１ｍａｓｓ％以上配合することと組み合わせ
るので、焼結原料中粒度１ｍｍ以下の微粉部の塩基度が
低下し、酸性スラグの生成量が増加して、ＲＤＩに悪い
とされる「ヘマタイト＋カルシウムフェライト」組織の
生成が抑制される。その結果、低ＳｉＯ2 ・低ＭｇＯに
なってもＲＤＩは悪化しない。It is well known that the reduction powder index (RDI) is deteriorated when the levels of SiO 2 and MgO of the sintered ore components are simultaneously lowered, but the sintered ore of the present invention has a grain size of 1 or less.
The fine powder silica (silica sand) containing 75 mass% or more of particles of 75 mm or less is combined with 0.1 mass% or more of the powder, so that the basicity of the fine powder portion of the sintering raw material having a particle size of 1 mm or less is reduced, and the amount of acidic slag is generated. Increased, the formation of “hematite + calcium ferrite” structure, which is considered to be bad for RDI, is suppressed. As a result, the RDI does not deteriorate even if the SiO 2 and MgO are reduced.
【００２１】一方、前記微粉珪石（珪砂）の配合比を増
すほどＲＤＩは改善されるが、前記微粉珪石（珪砂）を
１．０ｍａｓｓ％超配合してもその効果は頭打ちになる
傾向が見られた。このような微粉珪石の配合に、すでに
説明したような、粒度１．０〜３．０ｍｍの粒子または
造粒物を５０〜１００ｍａｓｓ％含む石灰石の配合や、
粒度０．５〜１．５ｍｍの粒子または造粒物を５０〜１
００ｍａｓｓ％含むコークスの配合を組み合わせると、
さらにＲＤＩの悪化を抑制できることも分かった。この
ように焼結鉱のＲＤＩ悪化を抑制することにより、高炉
シャフト上部の通気性悪化を防止することができる。On the other hand, the RDI is improved as the blending ratio of the fine silica stone (silica sand) is increased, but even if the fine silica stone (silica sand) is blended in an amount of more than 1.0 mass%, the effect tends to reach a ceiling. It was In addition to such fine silica powder, as described above, limestone containing particles or granules having a particle size of 1.0 to 3.0 mm in an amount of 50 to 100 mass%, and
Particles with a particle size of 0.5 to 1.5 mm or granulated material are 50 to 1
When the combination of coke containing 100 mass% is combined,
It was also found that the deterioration of RDI can be suppressed. By suppressing the deterioration of the RDI of the sinter in this way, it is possible to prevent deterioration of the air permeability of the upper part of the blast furnace shaft.
【００２２】[0022]
【表１】 [Table 1]
【００２３】次に、高炉（内容積３２００ｍ3 ）に微細
気孔の多い焼結鉱を装入して、微粉炭吹き込み量を１７
５ｋｇ／ｔ−ｐに増加させた場合の実施例を説明する。
本発明の実施例を従来法と比較して表２にまとめた。従
来法では、微粉炭比１３０ｋｇ／ｔ−ｐの操業レベルか
ら微粉炭比１７５ｋｇ／ｔ−ｐの操業レベル（比較例、
期間Ａ）へと微粉炭多量使用レベルへ変更する過程で通
気抵抗が増大するとともに、スリップが発生するように
なり、炉体放散熱も増えて、高炉操業は不調に陥った。
これは、微粉炭比の増加によりＯ／Ｃが上昇し、焼結鉱
層の高温性状が悪化して炉内全圧損が大きくなったため
で、特に１６０ｋｇ／ｔ−ｐ以上でその傾向が顕著であ
った。Next, a blast furnace (internal volume: 3200 m 3 ) was charged with sinter having many fine pores, and the amount of pulverized coal injected was 17
An example in the case of increasing to 5 kg / tp will be described.
Examples of the present invention are summarized in Table 2 in comparison with the conventional method. In the conventional method, from the operation level of the pulverized coal ratio of 130 kg / tp to the operation level of the pulverized coal ratio of 175 kg / tp (comparative example,
In the process of changing to the pulverized coal heavy usage level in period A), the ventilation resistance increased, slippage started to occur, and the heat dissipated in the furnace body also increased.
This is because the O / C increased due to the increase of the pulverized coal ratio, the high temperature property of the sintered ore layer deteriorated, and the total pressure loss in the furnace became large. This tendency was particularly remarkable at 160 kg / tp or more. It was
【００２４】一方、微細気孔を増加させた低スラグ焼結
鉱を従来焼結鉱と置換した本発明の場合（期間Ｂ〜期間
Ｆ）には、微粉炭吹き込み量が１７５ｋｇ／ｔ−ｐであ
るにもかかわらず、通気抵抗値と炉体放散熱量は低下
し、スリップも発生しなくなった。これは、ＲＤＩ値の
低下により炉上部の通気性が改善されたのに加えて、特
に通気抵抗を悪化させる要因となる融着帯根部の肥大化
も防止できたと考えられ、炉下部の異常も全く見られな
かった。On the other hand, in the case of the present invention in which the low slag sinter having increased fine pores is replaced with the conventional sinter (period B to period F), the amount of pulverized coal blown is 175 kg / tp. Nevertheless, the ventilation resistance and the amount of heat dissipated in the furnace body decreased, and slippage no longer occurred. It is thought that this is because in addition to improving the air permeability of the upper part of the furnace by lowering the RDI value, it was also possible to prevent enlargement of the root of the cohesive zone, which is a factor that particularly deteriorates the air flow resistance. I couldn't see it at all.
【００２５】[0025]
【表２】 [Table 2]
【００２６】[0026]
【発明の効果】以上のように、微粉炭吹き込み量を１５
０ｋｇ／ｔ−ｐ以上に増加させても、本発明により融着
帯の通気抵抗を悪化させることなく、高炉安定操業を継
続することができる。本発明は、微粉炭多量吹き込み操
業において、微細気孔が多く、かつ低スラグの焼結鉱を
装入することにより、軟化融着帯の幅が従来よりも薄く
なるように制御し、炉下部の通気抵抗の悪化を抑制し
て、１５０ｋｇ／ｔ−ｐ以上の微粉炭多量吹き込みにお
いても高炉操業の安定化を可能にするものである。As described above, the amount of pulverized coal blown is 15
Even if it is increased to 0 kg / tp or more, the present invention allows the blast furnace stable operation to be continued without deteriorating the ventilation resistance of the cohesive zone. The present invention, in the operation of blowing a large amount of pulverized coal, there are many fine pores, and by charging a low-slag sinter, the width of the softening cohesive zone is controlled to be thinner than before, and the furnace bottom By suppressing deterioration of ventilation resistance, it becomes possible to stabilize blast furnace operation even when a large amount of pulverized coal of 150 kg / tp or more is blown.
【図１】高炉内融着帯をシミュレーションした図FIG. 1 is a diagram simulating a cohesive zone in a blast furnace.
【図２】従来用いられてきた焼結鉱と本発明に用いる焼
結鉱の高温性状測定結果を示す図FIG. 2 is a diagram showing measurement results of high temperature properties of a conventionally used sintered ore and a sintered ore used in the present invention.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成８年７月９日[Submission date] July 9, 1996
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項１[Correction target item name] Claim 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【手続補正２】[Procedure amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項２[Correction target item name] Claim 2
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１０[Correction target item name] 0010
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００１０】[0010]
【課題を解決するための手段】本発明では、具体的に以
下のような手段によって上記目的を達成する。 （１）１５０ｋｇ／ｔ−ｐ以上の微粉炭を羽口から高炉
に吹き込む際に、１ｍｍ以下の粒度を７５ｍａｓｓ％以
上とした珪石を０．１〜１．０ｍａｓｓ％、その他を鉄
鉱石、石灰石、蛇紋岩として配合した新原料に、コーク
スを配合して、ＳｉＯ２を４．２〜４．９ｍａｓｓ％、
ＭｇＯを０．５〜１．２ｍａｓｓ％に調整して製造した
焼結鉱を高炉に装入して操業することを特徴とする微粉
炭多量吹き込み時の高炉操業方法。 （２）１５０ｋｇ／ｔ−ｐ以上の微粉炭を羽口から高炉
に吹き込む際に、１ｍｍ以下の粒度を７５ｍａｓｓ％以
上とした珪石を０．１〜１．０ｍａｓｓ％、その他を鉄
鉱石、石灰石、蛇紋岩として配合して新原料に、コーク
スを配合して、ＦｅＯを４．５〜６．５ｍａｓｓ％、Ｓ
ｉＯ２を３．９〜４．９ｍａｓｓ％、ＭｇＯを０．５〜
１．２ｍａｓｓ％に調整して製造した焼結鉱を高炉に装
入して操業することを特徴とする微粉炭多量吹き込み時
の高炉操業方法。In the present invention, the above object is specifically achieved by the following means. (1) When blowing pulverized coal of 150 kg / tp or more into the blast furnace from tuyere, 0.1 to 1.0 mass% of silica stone having a particle size of 1 mm or less of 75 mass% or more, iron ore, limestone, etc. Coke is blended with the new raw material blended as serpentine, and SiO 2 is 4.2 to 4.9 mass%,
A method for operating a blast furnace at the time of blowing a large amount of pulverized coal, characterized in that a sinter produced by adjusting MgO to 0.5 to 1.2 mass% is put into a blast furnace for operation. (2) When blowing pulverized coal of 150 kg / tp or more from the tuyere into the blast furnace, 0.1 to 1.0 mass% of silica stone having a particle size of 1 mm or less of 75 mass% or more, iron ore, limestone, etc. Blended as a serpentine with a new raw material, coke blended, and FeO of 4.5 to 6.5 mass%, S
iO 2 is 3.9 to 4.9 mass% and MgO is 0.5 to
A method for operating a blast furnace at the time of blowing a large amount of pulverized coal, characterized in that a sinter ore produced by adjusting the amount to 1.2 mass% is charged into a blast furnace and operated.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】図面[Document name to be amended] Drawing
【補正対象項目名】図１[Correction target item name] Fig. 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図１】 FIG.
Claims (5)
から高炉に吹き込む際に、１ｍｍ以下の粒度を７５ｍａ
ｓｓ％以上とした珪石を０．１〜１．０ｍｍｍａｓｓ
％、その他を鉄鉱石、石灰石、蛇紋岩として配合した新
原料に、コークスを配合して、ＳｉＯ2 を４．２〜４．
９ｍａｓｓ％、ＭｇＯを０．５〜１．２ｍａｓｓ％に調
整して製造した焼結鉱を高炉に装入して操業することを
特徴とする微粉炭多量吹き込み時の高炉操業方法。1. When a pulverized coal of 150 kg / tp or more is blown into a blast furnace from a tuyere, a particle size of 1 mm or less is 75 ma.
Silica stone with ss% or more 0.1-1.0 mmmass
%, The other raw materials containing iron ore, limestone, and serpentine as the raw materials, and coke to be mixed to obtain SiO 2 of 4.2 to 4.
A blast furnace operating method at the time of blowing a large amount of pulverized coal, characterized in that a sinter produced by adjusting 9 mass% and MgO to 0.5 to 1.2 mass% is manufactured and charged into a blast furnace.
から高炉に吹き込む際に、１ｍｍ以下の粒度を７５ｍａ
ｓｓ％以上とした珪石を０．１〜１．０ｍｍｍａｓｓ
％、その他を鉄鉱石、石灰石、蛇紋岩として配合した新
原料に、コークスを配合して、ＦｅＯを４．５〜６．５
ｍａｓｓ％、ＳｉＯ2 を３．９〜４．９ｍａｓｓ％、Ｍ
ｇＯを０．５〜１．２ｍａｓｓ％に調整して製造した焼
結鉱を高炉に装入して操業することを特徴とする微粉炭
多量吹き込み時の高炉操業方法。2. When the pulverized coal of 150 kg / tp or more is blown into the blast furnace from the tuyere, the grain size of 1 mm or less is 75 ma.
Silica stone with ss% or more 0.1-1.0 mmmass
%, The other raw materials containing iron ore, limestone, and serpentine, and coke, and FeO of 4.5 to 6.5.
mass%, SiO 2 3.9 to 4.9 mass%, M
A method for operating a blast furnace at the time of blowing a large amount of pulverized coal, characterized in that the sinter produced by adjusting gO to 0.5 to 1.2 mass% is put into a blast furnace for operation.
粒物を、５０〜１００ｍａｓｓ％含む石灰石を新原料に
配合して製造した焼結鉱を高炉に装入することを特徴と
する請求項１または請求項２に記載の微粉炭多量吹き込
み時の高炉操業方法。3. A sinter ore produced by mixing limestone containing 50 to 100 mass% of particles or granules having a particle size of 1.0 to 3.0 mm with a new raw material is charged into a blast furnace. A blast furnace operating method at the time of blowing a large amount of pulverized coal according to claim 1 or 2.
粒物を、５０〜１００ｍａｓｓ％含むコークスを焼結原
料に配合して製造した焼結鉱を高炉に装入することを特
徴とする請求項１ないし請求項３のいずれかに記載の微
粉炭多量吹き込み時の高炉操業方法。4. A sinter ore produced by mixing coke containing 50 to 100 mass% of particles or granules having a particle size of 0.5 to 1.5 mm with a sintering raw material is charged into a blast furnace. The method for operating a blast furnace at the time of blowing a large amount of pulverized coal according to any one of claims 1 to 3.
焼結新原料中に２５ｍａｓｓ％以上配合して製造した焼
結鉱を高炉に装入することを特徴とする請求項１ないし
請求項４のいずれかに記載の微粉炭多量吹き込み時の高
炉操業方法。5. A sinter ore produced by mixing 25 mass% or more of iron ore containing 5 mass% or more of water of crystallization in a new raw material for sintering is charged into a blast furnace. A method for operating a blast furnace when a large amount of pulverized coal is blown in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15746996A JP3746842B2 (en) | 1995-11-10 | 1996-05-30 | Blast furnace operation method when a large amount of pulverized coal is injected |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31584795 | 1995-11-10 | ||
| JP7-315847 | 1995-11-10 | ||
| JP15746996A JP3746842B2 (en) | 1995-11-10 | 1996-05-30 | Blast furnace operation method when a large amount of pulverized coal is injected |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09194914A true JPH09194914A (en) | 1997-07-29 |
| JP3746842B2 JP3746842B2 (en) | 2006-02-15 |
Family
ID=26484908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15746996A Expired - Lifetime JP3746842B2 (en) | 1995-11-10 | 1996-05-30 | Blast furnace operation method when a large amount of pulverized coal is injected |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3746842B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113272463A (en) * | 2018-12-26 | 2021-08-17 | 杰富意钢铁株式会社 | Method for producing sintered ore |
| CN115491446A (en) * | 2022-09-21 | 2022-12-20 | 中冶南方工程技术有限公司 | A low-carbon smelting method and system for efficiently utilizing waste heat of blast furnace slag |
| CN117265194A (en) * | 2023-09-27 | 2023-12-22 | 山西潞安环保能源开发股份有限公司 | Additive for blast furnace injection coal and preparation method and application thereof |
-
1996
- 1996-05-30 JP JP15746996A patent/JP3746842B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113272463A (en) * | 2018-12-26 | 2021-08-17 | 杰富意钢铁株式会社 | Method for producing sintered ore |
| CN115491446A (en) * | 2022-09-21 | 2022-12-20 | 中冶南方工程技术有限公司 | A low-carbon smelting method and system for efficiently utilizing waste heat of blast furnace slag |
| CN117265194A (en) * | 2023-09-27 | 2023-12-22 | 山西潞安环保能源开发股份有限公司 | Additive for blast furnace injection coal and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3746842B2 (en) | 2006-02-15 |
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