JPH10251716A - Mud material in blast furnace and method for protecting furnace buttom of blast furnace - Google Patents
Mud material in blast furnace and method for protecting furnace buttom of blast furnaceInfo
- Publication number
- JPH10251716A JPH10251716A JP7666797A JP7666797A JPH10251716A JP H10251716 A JPH10251716 A JP H10251716A JP 7666797 A JP7666797 A JP 7666797A JP 7666797 A JP7666797 A JP 7666797A JP H10251716 A JPH10251716 A JP H10251716A
- Authority
- JP
- Japan
- Prior art keywords
- vanadium
- blast furnace
- brick
- furnace
- tapping hole
- 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.)
- Withdrawn
Links
Landscapes
- Blast Furnaces (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、高炉の出銑口閉塞
時に用いるマッド材、および、高炉炉底の保護方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mud material used for closing a tap hole of a blast furnace and a method for protecting a blast furnace bottom.
【0002】[0002]
【従来の技術】高炉の長寿命化には溶銑原価を低減する
効果があり、いろいろな対策が実施されてきている。と
くに近年、高炉設備の改良、具体的には炉体冷却装置の
強化(例、ステーブ冷却能、冷却盤冷却能、羽口冷却
能、等)、および、損傷した炉体部分の補修技術の進歩
より、炉体の寿命が飛躍的に延びてきており、近年では
炉寿命の実績の平均値は15年に近くなってきている。2. Description of the Related Art Prolonging the life of a blast furnace has the effect of reducing the cost of hot metal, and various measures have been taken. Especially in recent years, blast furnace facilities have been improved, specifically, furnace body cooling systems have been strengthened (eg, stave cooling capacity, cooling board cooling capacity, tuyere cooling capacity, etc.), and repair techniques for damaged furnace body parts have been improved. Accordingly, the life of the furnace body has been dramatically extended, and in recent years, the average value of the results of the furnace life has been approaching 15 years.
【0003】このように寿命を延ばしてきた高炉の改修
を決める律速部位は、現状では、シャフト下部と炉底側
壁部である。シャフト下部については、中間補修技術の
進歩により律速部分でなくなりつつあり、炉底側壁部の
レンガ残存厚みが改修の律速となる高炉が大半である。At present, the rate-determining parts that determine the repair of a blast furnace that has extended its life are the lower part of the shaft and the bottom wall of the furnace. The lower part of the shaft is no longer the rate limiting part due to the progress of the intermediate repair technology, and most blast furnaces have the remaining brick thickness on the furnace bottom side wall as the rate limiting part of the repair.
【0004】炉底側壁部のレンガ残存厚みの低減を抑制
する技術としては、炉底側壁部の冷却を強化する方法、
レンガ残存厚みが薄い箇所の上部の羽口からチタン酸化
物を吹き込み、粘性の高い溶銑の粘稠層をレンガの炉内
側に形成させて保護する方法、レンガ残存厚みが薄い箇
所の上部の羽口を盲化する方法、レンガ残存厚みが薄い
箇所の上部の羽口の送風量を支管風量制御弁で絞る方
法、休風してレンガ残存厚みが薄い箇所に粘稠層を形成
させる方法等が実施されてきている。Techniques for suppressing the reduction of the remaining brick thickness of the furnace bottom side wall include a method of enhancing cooling of the furnace bottom side wall,
Titanium oxide is blown from the tuyere above the place where the remaining brick thickness is thin, and a viscous layer of hot metal is formed inside the furnace of the brick to protect it. The tuyere above the place where the brick remaining thickness is thin Method of blinding the air, narrowing the air volume of the tuyere above the place where the brick residual thickness is thin with a branch pipe air flow control valve, and forming a viscous layer at the place where the brick residual thickness is thin by cooling off Have been.
【0005】また、特開平6−256822号公報で
は、金属チタンまたは鉄チタン合金と加粘性物質の混合
材料を高炉の出銑孔より圧入し、出銑孔近傍の粘性を上
昇させて粘稠層を形成させ、出銑孔近傍の側壁レンガの
残存厚みの低減を抑制する技術が開示されている。In Japanese Patent Application Laid-Open No. 6-256822, a mixed material of metallic titanium or iron-titanium alloy and a viscous substance is injected from a tap hole of a blast furnace, and the viscosity near the tap hole is increased to increase the viscosity of the viscous layer. There is disclosed a technique for suppressing the reduction of the remaining thickness of the side wall brick near the tap hole.
【0006】[0006]
【発明が解決しようとする課題】一般的に炉底側壁部と
いっても、レンガ残存厚みが薄くなるのは出銑口近傍の
出銑口より下の側壁部である。したがって、炉底側壁部
の冷却を強化する方法を実施したとしても設備構造上冷
却能力には限界がある。上記手段のほかに、炉頂からの
チタン酸化物の装入、あるいはレンガ残存厚みが薄い箇
所の上部の羽口からのチタン酸化物の吹き込みにより粘
性の高い溶銑の粘稠層を形成させて保護する方法、レン
ガ残存厚みが薄い箇所の上部の羽口径を絞るあるいは盲
化する方法、レンガ残存厚みが薄い箇所の上部の羽口の
送風量を支管風量制御弁で絞る方法が実施されている。Generally speaking, even if the furnace bottom side wall is used, the remaining brick thickness is reduced in the side wall below the tap hole near the tap hole. Therefore, even if the method of strengthening the cooling of the furnace bottom side wall portion is implemented, the cooling capacity is limited due to the structure of the equipment. In addition to the above measures, protection by forming a viscous layer of hot metal with high viscosity by charging titanium oxide from the furnace top or blowing titanium oxide from the tuyere above the brick where the remaining thickness is thin A method of narrowing or blinding the tuyere diameter at a portion where the brick has a small remaining thickness, and a method of restricting the amount of air blown at the tuyere above a portion where the brick has a small thickness by a branch pipe air flow control valve.
【0007】しかし、いずれの方法もレンガ残存厚みが
薄くなりやすい出銑口近傍の出銑口より下の側壁部レン
ガの損耗抑制には限界がある。とくに炉頂からチタン酸
化物を装入する方法では、出銑口近傍のレンガ残存厚み
が薄い箇所の損耗を抑制するためには装入量を多くする
必要がある。しかし、装入量を過大にすると、炉床全体
の溶銑の粘性を上昇させ炉床の通液性を悪化させる可能
性も大きいため、装入量に上限がありレンガ損耗抑制効
果もあまり期待できない。However, in any of the methods, there is a limit to the suppression of wear of the side wall brick below the taphole near the taphole where the remaining brick thickness tends to be thin. In particular, in the method of charging the titanium oxide from the furnace top, it is necessary to increase the charging amount in order to suppress the wear at the place where the remaining brick thickness is small near the taphole. However, if the charging amount is excessive, there is a large possibility that the viscosity of the hot metal in the entire hearth increases and the liquid permeability of the hearth deteriorates, so the charging amount has an upper limit and the effect of suppressing brick wear cannot be expected much. .
【0008】特開平6−256822号公報で開示され
ている技術では、出銑口近傍の側壁レンガの残存厚みの
低減を抑制する効果がある。しかし、溶銑中へのチタン
1重量%の溶解による溶銑粘性上昇幅は20%程度であ
り、本技術適用による溶銑粘性上昇効果は小さい。The technique disclosed in Japanese Patent Application Laid-Open No. 6-256822 has an effect of suppressing a reduction in the remaining thickness of the side wall brick near the taphole. However, the increase in hot metal viscosity due to the dissolution of 1% by weight of titanium in hot metal is about 20%, and the effect of increasing the hot metal viscosity by applying the present technology is small.
【0009】[0009]
【課題を解決するための手段】本発明は、上記の問題を
解決するために、タール、ピッチ、グラファイト、粘土
の1種以上からなる高炉の出銑口の閉塞に用いるマッド
材において、バナジウムを5〜50重量%含有したこと
を特徴とする。また、前記において、バナジウムが、金
属バナジウムおよび/または鉄バナジウム合金であるこ
とを特徴とする。また、高炉の出銑口を閉塞する際に、
バナジウムを5〜50重量%含むマッド材を用いること
を特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a mud material for blocking a taphole of a blast furnace comprising at least one of tar, pitch, graphite, and clay, which comprises vanadium. It is characterized by containing 5 to 50% by weight. Further, in the above, it is characterized in that the vanadium is a metal vanadium and / or an iron vanadium alloy. Also, when closing the tap hole of the blast furnace,
A mud material containing 5 to 50% by weight of vanadium is used.
【0010】[0010]
【発明の実施の形態】本発明では、レンガ残存厚みが薄
くなりやすい出銑口近傍の出銑口より下の側壁部のレン
ガ損耗を抑制するために、高炉の出銑口閉塞時に使用す
るマッド材に溶銑の粘性を大きく上昇させる添加物を混
合させる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a mud used for closing a tap hole of a blast furnace in order to suppress brick wear on a side wall portion below the tap hole near the tap hole where the remaining brick thickness tends to be thin. An additive is added to the material to greatly increase the viscosity of the hot metal.
【0011】溶銑中へのバナジウム1重量%の溶解によ
る溶銑粘性上昇効果は40%強と、チタンを添加したマ
ッド使用した場合の溶銑粘性上昇効果の2倍強ときわめ
て大きい。したがって、本発明適用時には、チタンを添
加したマッド使用した場合に比べて、出銑口近傍での粘
稠層を容易に形成させることができる。The effect of increasing the viscosity of hot metal by dissolving 1% by weight of vanadium in the hot metal is as large as slightly over 40%, and more than twice the effect of increasing the viscosity of hot metal when a mud containing titanium is used. Therefore, when the present invention is applied, a viscous layer near the taphole can be easily formed as compared with the case where a mud to which titanium is added is used.
【0012】ここで、本発明のマッド材におけるバナジ
ウムの含有量を50%超にすると、マッドの材質変化が
大きくなりすぎ、出銑閉塞機能を発揮しなくなる。ま
た、本発明のマッド材におけるバナジウムの含有量が5
重量%未満では、出銑口近傍の溶銑の粘性上昇幅が小さ
くて、出銑口近傍での粘稠層形成効果が小さすぎる。さ
らに、バナジウムを金属バナジウムおよび/または鉄バ
ナジウム合金の形態とするのは、溶銑中への溶解を容易
に進行させるためである。Here, when the content of vanadium in the mud material of the present invention is more than 50%, the material change of the mud becomes too large, and the tapping function is not exhibited. Further, the content of vanadium in the mud material of the present invention is 5%.
If the amount is less than the weight percentage, the increase in the viscosity of the hot metal near the taphole is small, and the viscous layer forming effect near the taphole is too small. Further, the reason why vanadium is in the form of metal vanadium and / or iron vanadium alloy is to facilitate the dissolution in hot metal.
【0013】なお、稼動期間が10年以上の高炉では、
出銑口近傍の出銑口より下の側壁部のレンガの摩耗・浸
食による損耗が進行しており、本発明法を常時提供する
ことが望ましい。In a blast furnace having an operation period of 10 years or more,
Since the wear and erosion of the brick on the side wall portion below the taphole near the taphole is progressing, it is desirable to always provide the method of the present invention.
【0014】[0014]
【実施例】本発明を適用した高炉は、炉口径9m弱の内
容積が2000m3 級の高炉で、出銑口を2本有してお
り、本高炉は現在火入れからの稼動期間が13年を経過
している。図1に示すように、本高炉では、稼動期間が
10年経過した時期から、粘稠層を含む炉底側壁のレン
ガ残厚が1000mm以下の状態になり、年に1〜2回
粘稠層が消滅して出銑口近傍の出銑口より下の炉壁部レ
ンガ温度が、250〜280℃まで上昇する現象が発生
した。DESCRIPTION OF THE PREFERRED EMBODIMENTS A blast furnace to which the present invention is applied is a blast furnace having a furnace diameter of less than 9 m and a 2,000 m 3 class internal volume, having two tap holes, and this blast furnace has been operating for 13 years since the current ignition. Has passed. As shown in FIG. 1, in the present blast furnace, from the time when the operation period has passed 10 years, the brick thickness on the bottom wall of the furnace including the viscous layer becomes 1000 mm or less, and the viscous layer once or twice a year. Disappeared and the temperature of the furnace wall brick below the taphole near the taphole rose to 250 to 280 ° C.
【0015】11年経過後より本発明法を実施し、バナ
ジウムを20重量%含むマッド材を出銑口の閉塞に用い
た結果、出銑口近傍の出銑口より下の炉壁部レンガ温度
が徐々に低下しはじめ、5ケ月後には125℃前後の温
度になると同時に変動が小さくなった。After the elapse of 11 years, the method of the present invention was carried out, and a mud material containing 20% by weight of vanadium was used for closing the tap hole. As a result, the temperature of the brick wall below the tap hole near the tap hole was reduced. Began to gradually decrease, and after 5 months, the temperature became around 125 ° C. and the fluctuation became small.
【0016】その結果、従来法では1〜2時間の臨時休
風をして炉壁部レンガ温度が上昇した箇所の上部の羽口
を盲化したり、数時間から数十時間の休風をして粘稠層
の形成を促進する手段を実施せざるを得なかったが、本
発明法の適用後にはこれらの処置を皆無にすることがで
きた。As a result, in the conventional method, the temporary wind is shut off for 1 to 2 hours to blind the tuyere above the place where the temperature of the furnace wall brick is increased, or to shut off the wind for several hours to several tens of hours. However, it was necessary to take measures to promote the formation of a viscous layer, but these treatments could be completely eliminated after application of the method of the present invention.
【0017】[0017]
【発明の効果】本発明の実施により、出銑口近傍の出銑
口より下の側壁部レンガ温度が上昇する現象が皆無とな
り、出銑口近傍の出銑口より下の側壁部レンガ損耗の抑
制対策のための休風による減産がなくなると同時に、高
炉の長寿命化を可能にした。By the practice of the present invention, there is no phenomenon that the temperature of the side wall brick below the taphole near the taphole rises, and the wear of the side wall brick below the taphole near the taphole is reduced. In addition to eliminating production cuts due to wind breaks as a countermeasure, it has also made it possible to extend the life of the blast furnace.
【図1】本発明実施前後の出銑口近傍の出銑口より下の
側壁レンガ温度のmax値の推移を示す図FIG. 1 is a diagram showing a transition of a maximum value of a side wall brick temperature below a taphole near a taphole before and after implementation of the present invention.
Claims (3)
1種以上からなる高炉の出銑口の閉塞に用いるマッド材
において、バナジウムを5〜50重量%含有したことを
特徴とする高炉のマッド材。1. A blast furnace mud material comprising at least one of tar, pitch, graphite, and clay for use in closing a taphole of a blast furnace, comprising 5 to 50% by weight of vanadium.
または鉄バナジウム合金であることを特徴とする請求項
1記載の高炉のマッド材。2. The method according to claim 1, wherein the vanadium is metallic vanadium and / or vanadium.
The mud material for a blast furnace according to claim 1, wherein the mud material is an iron vanadium alloy.
ムを5〜50重量%含むマッド材を用いることを特徴と
する高炉炉底の保護方法。3. A method for protecting a blast furnace bottom, comprising using a mud material containing 5 to 50% by weight of vanadium when closing a tap hole of the blast furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7666797A JPH10251716A (en) | 1997-03-13 | 1997-03-13 | Mud material in blast furnace and method for protecting furnace buttom of blast furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7666797A JPH10251716A (en) | 1997-03-13 | 1997-03-13 | Mud material in blast furnace and method for protecting furnace buttom of blast furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10251716A true JPH10251716A (en) | 1998-09-22 |
Family
ID=13611777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7666797A Withdrawn JPH10251716A (en) | 1997-03-13 | 1997-03-13 | Mud material in blast furnace and method for protecting furnace buttom of blast furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10251716A (en) |
-
1997
- 1997-03-13 JP JP7666797A patent/JPH10251716A/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20040601 |