JP2580204B2 - Blast furnace taphole plugging material - Google Patents
Blast furnace taphole plugging materialInfo
- Publication number
- JP2580204B2 JP2580204B2 JP62264905A JP26490587A JP2580204B2 JP 2580204 B2 JP2580204 B2 JP 2580204B2 JP 62264905 A JP62264905 A JP 62264905A JP 26490587 A JP26490587 A JP 26490587A JP 2580204 B2 JP2580204 B2 JP 2580204B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- alumina
- blast furnace
- plugging material
- corrosion resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Ceramic Products (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高炉出銑孔の閉塞材に関し、特にマグネシア
・アルミナスピネル原料を用いた高炉出銑孔閉塞材に関
する。Description: TECHNICAL FIELD The present invention relates to a blast furnace taphole plugging material, and more particularly to a blast furnace taphole plugging material using magnesia-alumina spinel raw material.
近年、高炉の大型化と高圧操業にともない出銑孔の閉
塞材は耐食性および耐火性に優れたものが要求されてい
る。また、経費節減の必要性から、出銑孔の開孔および
閉塞作業の工数削減、すなわち、作業要員の削減が進め
られており、従って、出銑回数の大巾な低減が必要であ
り、耐食性、耐火性に優れた出銑孔閉塞材の開発が求め
られている。In recent years, with the increase in the size of blast furnaces and high-pressure operations, tapping plugs having excellent corrosion resistance and fire resistance have been required. In addition, due to the necessity of cost reduction, the number of man-hours for opening and closing tap holes is reduced, that is, the number of working personnel is reduced. Therefore, there is a need for the development of a tap hole plugging material having excellent fire resistance.
従来のマッド材はシリカ質の耐火材を主原料に用いて
いたが、シリカ質原料はFeOに対する耐食性が悪いとい
う問題があり、そこで、最近では耐食性、耐火性の向上
を図るためアルミナ質原料のマッド材が開発され、使用
されている。Conventional mud materials have used silica-based refractory materials as the main raw material, but silica-based materials have the problem of poor corrosion resistance to FeO, so recently, in order to improve corrosion resistance and fire resistance, alumina-based Mud wood has been developed and used.
現在使用されているアルミナ質出銑孔閉塞材は主とし
てAl2O3−SiC−Ｃ系耐火物であり、シリカ系原料に比し
て耐食性および耐スポーリング性に優れている。しかし
ながら、体積安定性と耐滓性向上を図るために使用され
ている耐火珪素は、高温出銑により分解・酸化された時
にはSiO2が生成し、溶銑、そして溶銑中のFeOと反応し
やすくなり、耐食性が低下するという問題がある。Alumina tapping hole occluder in current use are mainly Al 2 O 3 -SiC-C based refractory, as compared with the silica-based material has excellent corrosion resistance and spalling resistance. However, refractory silicon used to improve volume stability and slag resistance, when decomposed and oxidized by high-temperature tapping, produces SiO 2, which easily reacts with hot metal and FeO in hot metal. However, there is a problem that the corrosion resistance is reduced.
この発明は上記従来の事情に鑑みて提案されたもので
あって、アルミナ質の閉塞材でより耐食性、耐火性に優
れた閉塞材を提供することを目的とする。The present invention has been proposed in view of the above-mentioned conventional circumstances, and has as its object to provide an alumina-based plugging material having more excellent corrosion resistance and fire resistance.
本発明はアルミナ質原料30〜58重量％、マグネシア・
アルミナスピネル原料10〜30重量％、炭素原料10〜20重
量％、結合材としてフェロシリコンを３〜10重量％、粘
土３〜10重量％にバインダーとして無水タールを10〜20
重量％添加し、混練したものである。The present invention relates to an alumina raw material of 30 to 58% by weight,
Alumina spinel material 10-30% by weight, carbon material 10-20% by weight, ferrosilicon 3-10% by weight as binder, clay 3-10% by weight, anhydrous tar 10-20 as binder
% By weight and kneaded.
アルミナ質原料としては電融アルミナ、焼結アルミ
ナ、、ボーキサイトそしてバン土頁岩が使用できる。そ
の粒度は3mm以下のものを使用する。アルミナ質原料が3
0重量％より少ないと耐食性が著しく低下し、58重量％
より多いと焼結不足となり耐摩性が低下する。As the alumina material, electrofused alumina, sintered alumina, bauxite and ban shale can be used. The particle size should be 3mm or less. 3 alumina raw materials
If it is less than 0% by weight, the corrosion resistance is remarkably reduced, and 58% by weight.
If the amount is larger than the above, sintering becomes insufficient and the wear resistance is reduced.
マグネシア・アルミナスピネル原料としては、合成ス
ピネルまたは電融スピネルが使用できる。その粒度は3m
m以下のものを使用する。使用量が10重量％未満の時は
耐食性向上にあまり寄与しない。30重量％以上になる
と、出銑孔閉塞材の価格上昇に見合うだけの耐食性の向
上効果が得られない。As the magnesia-alumina spinel raw material, synthetic spinel or electrofused spinel can be used. Its particle size is 3m
Use m or less. When the amount is less than 10% by weight, it does not contribute much to the improvement of corrosion resistance. If the content is 30% by weight or more, the effect of improving the corrosion resistance cannot be obtained in proportion to the increase in the price of the tap hole plugging material.
炭素原料としては、石炭コークス、石油コークス、タ
ールピッチ等が用いられ、その粒度は3mm以下のものを
用いる。炭素原料が10重量％以下の場合は溶銑・溶滓の
侵入防止の効果が小さく、また過焼結により開孔難を生
じせしめる可能性がある。また炭素原料が20重量％以上
になると焼結不足による耐摩耗性低下の原因となるので
望ましくない。As the carbon raw material, coal coke, petroleum coke, tar pitch and the like are used, and those having a particle size of 3 mm or less are used. When the carbon material content is 10% by weight or less, the effect of preventing intrusion of hot metal and slag is small, and over-sintering may cause difficulty in opening. Further, if the carbon material content is 20% by weight or more, it is not desirable because it causes a decrease in wear resistance due to insufficient sintering.
フェロシリコンは主として微粉粒度0.1mm以下を用
い、３重量％未満では焼結性向上に対する寄与が小さ
く、10重量％以上では耐食性が低下する。Ferrosilicon mainly has a fine powder particle size of 0.1 mm or less. If it is less than 3% by weight, the contribution to the improvement in sinterability is small, and if it is 10% by weight or more, the corrosion resistance decreases.
粘土としては、ジョージアカオリン、ケンタッキーボ
ールクレーが用いられる。粘土重量が３重量％以下では
作業性、すなわち、充填性が寄与せず、10重量％以上で
は耐食性が低下する。Georgia kaolin and Kentucky ball clay are used as the clay. When the clay weight is 3% by weight or less, workability, that is, the filling property does not contribute, and when the clay weight is 10% by weight or more, the corrosion resistance decreases.
バインダーとして用いる無水タールは、10重量％以下
では良好な作業性が得られない。すなわち、マッドをマ
ッドガンから出銑孔へ充填することができない。20重量
％以上では開孔時に出銑孔からのガスの吹き戻しが大き
く成って危険である。If the amount of the anhydrous tar used as the binder is 10% by weight or less, good workability cannot be obtained. That is, the mud cannot be filled into the tap hole from the mud gun. If the content is more than 20% by weight, the blow-back of gas from the tap hole at the time of opening is large, which is dangerous.
第１表に従来品としてシリカ質とアルミナ質原料を用
いた閉塞材を、また、本願発明品として実 施例１、２、３のマッド材の配合率を示す。Table 1 shows plugging materials using siliceous and alumina-based raw materials as conventional products, and actual products of the present invention. The mixing ratio of the mud material of Examples 1, 2, and 3 is shown.
第２表に焼成後の線変化率、1400℃での熱間曲げ強
さ、および溶損指数を、また、実炉で使用した場合の出
銑時間を示す。Table 2 shows the linear change rate after firing, the hot bending strength at 1400 ° C., and the erosion index, and the tapping time when used in an actual furnace.
第２表からも理解できるように本発明品は耐食性に優
れ、体積安定性もよい。これを4000m3級の大型高炉に使
用したところ、出銑回数は従来の１日当たり７〜９回が
５〜６回と大巾に減少した。 As can be seen from Table 2, the product of the present invention has excellent corrosion resistance and good volume stability. This was used for the large-scale blast furnace of 4000m 3 primary, tapping the number was reduced by a large margin and is 5-6 times the conventional one-day 7-9 times.
以上説明したようにこの発明は、アルミナ質耐火材に
マグネシア・アルミナスピネルを添加したので、溶銑・
溶滓に対する耐食性が向上し、出銑孔の孔径拡大の割合
が小さくなり、長時間出銑が可能になった。従って、出
銑回数が低減され、炉前における出銑作業の工数削減が
図れ、製銑コストの低減を図ることができる。As described above, according to the present invention, magnesia / alumina spinel is added to the alumina-based refractory material.
The corrosion resistance against slag was improved, the rate of expansion of the tap hole diameter was reduced, and tapping was possible for a long time. Therefore, the number of tapping times can be reduced, the man-hour for tapping work before the furnace can be reduced, and the cost of iron making can be reduced.
Claims (1)
・アルミナスピネル原料10〜30重量％、炭素原料10〜20
重量％、結合材としてフェロシリコンを３〜10重量％、
粘土３〜10重量％にバインダーとして無水タールを10〜
20重量％添加したことを特徴とする高炉出銑孔閉塞材。(1) 30 to 58% by weight of alumina raw material, 10 to 30% by weight of magnesia / alumina spinel raw material, 10 to 20% of carbon raw material
%, Ferrosilicon as binder 3-10% by weight,
3 to 10% by weight of clay and 10 to 10% of anhydrous tar as binder
A blast furnace tapping hole plugging material characterized by adding 20% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62264905A JP2580204B2 (en) | 1987-10-20 | 1987-10-20 | Blast furnace taphole plugging material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62264905A JP2580204B2 (en) | 1987-10-20 | 1987-10-20 | Blast furnace taphole plugging material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01108170A JPH01108170A (en) | 1989-04-25 |
| JP2580204B2 true JP2580204B2 (en) | 1997-02-12 |
Family
ID=17409845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62264905A Expired - Lifetime JP2580204B2 (en) | 1987-10-20 | 1987-10-20 | Blast furnace taphole plugging material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2580204B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0647504B2 (en) * | 1990-03-29 | 1994-06-22 | 品川炉材株式会社 | Mud material for tapping of blast furnace |
| US8062577B2 (en) | 2009-04-10 | 2011-11-22 | Edw. C. Levy Co. | Alumina taphole fill material and method for manufacturing |
| CN107042300B (en) * | 2017-04-18 | 2020-01-14 | 鞍山浦项特种耐火材料有限公司 | Sliding plate brick for special steel and production method thereof |
-
1987
- 1987-10-20 JP JP62264905A patent/JP2580204B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01108170A (en) | 1989-04-25 |
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