JPH0822780B2 - Casting amorphous refractory for blast furnace tappipe cover - Google Patents
Casting amorphous refractory for blast furnace tappipe coverInfo
- Publication number
- JPH0822780B2 JPH0822780B2 JP63229199A JP22919988A JPH0822780B2 JP H0822780 B2 JPH0822780 B2 JP H0822780B2 JP 63229199 A JP63229199 A JP 63229199A JP 22919988 A JP22919988 A JP 22919988A JP H0822780 B2 JPH0822780 B2 JP H0822780B2
- Authority
- JP
- Japan
- Prior art keywords
- blast furnace
- cover
- refractory
- weight
- amorphous refractory
- 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 - Fee Related
Links
Landscapes
- Ceramic Products (AREA)
- Blast Furnaces (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、高炉出銑樋カバー用流し込み不定形耐火物
に関する。Description: FIELD OF THE INVENTION The present invention relates to a castable refractory material for a blast furnace tappipe cover.
従来の技術 高炉出銑樋では、出銑時に溶銑の保温及び環境安全性
を目的として、耐火物で築造されたカバーが、樋を覆う
ような形で設置されている。2. Description of the Related Art In a blast furnace tap iron gutter, a cover made of refractory is installed in a form covering the gutter for the purpose of keeping the hot metal warm and environmental safety during tapping.
なかでも、高炉出銑口に最も近接した大樋カバーと称
する樋カバーは、他のカバーに比較して（１）出銑口か
らの溶銑飛沫によるアタツク（２）噴出ガスの二次燃焼
による高温化（３）出銑毎に樋カバーは着脱されるため
の熱スポーリングを受ける等のことから非常に苛酷な条
件にさらされる。Among them, the gutter cover, which is called the gutter cover closest to the blast furnace tap, is (1) attacked by the hot metal spray from the tap (2) the temperature rises due to the secondary combustion of the blown gas. (3) The gutter cover is exposed to extremely harsh conditions because it is subjected to heat spalling for attachment and detachment at each tap.
加えて最近では、高圧操業・集塵の強化等から密閉化
が一段と進み、条件の厳しさが増している。In addition, recently, due to the high pressure operation and the strengthening of dust collection, the hermetic sealing has been further advanced, and the strictness of the conditions is increasing.
従来、樋カバーの耐火物は、高アルミナ質原料をベー
スに５〜20重量％の炭化珪素微粉を配合した不定形耐火
物でライニングされ、各炉の条件に合わせてAl2O3の含
有量を変化させて適応させてきた。しかしながら、Al2O
3の含有量の増加は、耐溶損性に優れる反面、耐熱衝撃
性が低下し、亀裂や剥離の発生が多く、それほどの効果
が得られないと共に、嵩比重が増加して施工体の重量
が、高炉現場のクレーン能力を越えることが多く、抜本
的な耐用度の改善には至らなかつた。Conventionally, the refractory for the gutter cover is lined with an amorphous refractory containing 5 to 20% by weight of silicon carbide fine powder based on a high-alumina raw material, and the content of Al 2 O 3 according to the conditions of each furnace. Has been adapted by changing. However, Al 2 O
Increasing the content of 3 is excellent in melting resistance, on the other hand, the thermal shock resistance is lowered, cracks and peeling often occur, not so much effect is obtained, and the bulk specific gravity increases and the weight of the construction body increases. In many cases, the crane capacity at the blast furnace site was exceeded, and no drastic improvement in durability was achieved.
発明が解決しようとする課題 本発明は、高炉出銑樋に使用される樋カバー材の化学
組成と粒度構成を研究し、軽量で耐スポーリング性と同
時に耐蝕性の向上をはかり、出銑樋カバーの寿命を改善
せんとする高炉出銑樋カバー用流し込み不定形耐火物を
提供するものである。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is to study the chemical composition and grain size composition of the gutter cover material used for blast furnace tapping gutter, aiming to improve the corrosion resistance while being lightweight and spalling resistance. (EN) A castable refractory material for a blast furnace tappipe cover that improves the life of the cover.
課題を解決するための手段 本発明は上記目的を達成するため、耐火性骨材、耐火
性超微粉及び凝集剤からなる不定形耐火物100重量％に
おいて、化学成分としてSiCを50〜85重量％含有し、更
にカーボンブラックを外割１重量％から2.5重量％及び
適当量の分散剤を添加した高炉出銑樋カバー用流し込み
不定形耐火物である。本発明においては、スラグに対し
て優れた化学的安定性を有している、炭化珪素質原料を
主体とし、また耐熱スポーリング性を改良するために、
骨材の粒度構成及び成分構成の面からカーボンブラック
の添加を検討した。骨材としての炭化珪素は、SiC含有
量が70％以上のものを単独で又は組合せて、適宜粒度調
整を施して使用する。Means for Solving the Problems In order to achieve the above object, the present invention comprises a refractory aggregate, a refractory ultrafine powder, and 100% by weight of an irregular shaped refractory composed of a coagulant, and 50 to 85% by weight of SiC as a chemical component. It is a castable refractory for blast furnace tappipe cover containing 1% to 2.5% by weight of carbon black and an appropriate amount of dispersant. In the present invention, which has excellent chemical stability against slag, is mainly composed of a silicon carbide material, and in order to improve the heat-resistant spalling property,
The addition of carbon black was examined from the viewpoint of the particle size constitution and component constitution of the aggregate. As the silicon carbide as the aggregate, one having a SiC content of 70% or more is used alone or in combination, and the particle size is appropriately adjusted before use.
また、耐蝕性・耐スポール性等の面から、耐火性骨材
として炭化珪素、耐火性超微粉としてSiO2の超微粉（シ
リカフラワー）やAl2O3の超微粉、凝集剤としてアルミ
ナセメントを使用した不定形耐火物100重量％におい
て、SiC成分は50〜85重量％が適切である。SiCが50重量
％以下では、耐蝕性が不充分であり、85重量％以上では
強度の発現に問題がある。From the viewpoint of corrosion resistance and spall resistance, silicon carbide is used as a refractory aggregate, ultrafine powder of SiO 2 (silica flower) or ultrafine powder of Al 2 O 3 as refractory ultrafine powder, and alumina cement as a coagulant. 50 to 85 wt% of SiC component is suitable for 100 wt% of the amorphous refractory used. If SiC is 50 wt% or less, corrosion resistance is insufficient, and if it is 85 wt% or more, there is a problem in developing strength.
さらに、耐熱スポーリング性の向上を目的として、カ
ーボンブラックを１重量％から2.5重量％添加する。添
加量を１重量％から2.5重量％としたのは、１重量％以
下では耐スポーリング性の効果が減少し、2.5重量％以
上では、強度低下が顕著になると共に、混練時の流動性
が減少し、施工性が不良となるからである。最も好まし
くは、２重量％添加するのが良い。Further, carbon black is added in an amount of 1% by weight to 2.5% by weight for the purpose of improving the heat resistant spalling property. The amount of addition is from 1% by weight to 2.5% by weight. The effect of spalling resistance is reduced when the amount is 1% by weight or less, and the strength is significantly reduced when the amount is 2.5% by weight or more, and the fluidity during kneading is increased. This is because the workability is reduced and the workability becomes poor. Most preferably, 2 wt% is added.
実施例 第１表に示すような配合の材料を成形し、耐蝕性試験
・耐摩耗性及び耐スポール性等の試験を実施した。実施
例Ａ〜Ｃは本発明品、比較例Ａ〜Ｃは従来品である。Example A material having a composition as shown in Table 1 was molded, and a corrosion resistance test, a wear resistance test, and a spall resistance test were performed. Examples A to C are products of the present invention, and Comparative Examples A to C are conventional products.
耐蝕性は、回転侵蝕試験炉で高炉スラグを溶融させ、
試片を１時間回転侵蝕させた後、30分強制空冷する。こ
のサイクルを５回繰り返し、侵蝕スピードを測定した。Corrosion resistance, melting blast furnace slag in a rotary erosion test furnace,
After rotating and eroding the test piece for 1 hour, it is air-cooled for 30 minutes. This cycle was repeated 5 times and the erosion speed was measured.
耐摩耗性は、並型煉瓦大の試片を1500℃に加熱しなが
ら、アルミナ粒5kgを圧力7kg/cm2で吹付け、損耗程度を
比較した。As for the wear resistance, the average degree of wear was compared by spraying 5 kg of alumina particles at a pressure of 7 kg / cm 2 while heating a sample of a normal brick size to 1500 ° C.
耐スポール性は、1450℃に１時間加熱後強制空冷30分
を１サイクルとして10回実施後の亀裂発生状況を比較し
た。これらの結果を、他の物性と共に第１表の下段に示
す。The spall resistance was compared by comparing the crack generation conditions after 10 cycles of heating at 1450 ° C. for 1 hour and forced air cooling for 30 minutes as one cycle. The results are shown in the lower part of Table 1 together with other physical properties.
高炉出銑樋において、第１表の実施例Ｃを内張りした
樋カバーを用いて実用に供した。その結果を、従来品
（比較例Ｂ）の結果と比較して、第２表に示す。この表
から明らかなように実施例Ｃは従来品（比較例Ｂ）に比
べて、使用量は550kg減少し、使用日数で２日延長、原
単位で約20％低下と優れた結果を示した。 The blast furnace tap gutter was put to practical use by using the gutter cover lined with Example C in Table 1. The results are shown in Table 2 in comparison with the results of the conventional product (Comparative Example B). As can be seen from this table, Example C showed excellent results such that the usage amount was reduced by 550 kg, the usage days were extended by 2 days, and the basic unit was reduced by about 20%, as compared with the conventional product (Comparative Example B). .
発明の効果 以上の結果から、本発明品は、従来品に比較して高炉
スラグなどによる溶損、高温における摩耗性および熱ス
ポーリング等に対し、優れた抵抗性を有する。さらに、
樋カバーの築造に際し、施工所要量は従来品に比較して
10％以上の減量が出来、実炉での耐用度の向上と共に、
原単位の低減に寄与することができた。 EFFECTS OF THE INVENTION From the above results, the product of the present invention has superior resistance to melting loss due to blast furnace slag, abrasion at high temperature, and heat spalling, as compared with the conventional product. further,
When constructing a gutter cover, the required construction amount is
The weight can be reduced by 10% or more, and the durability in the actual furnace is improved,
It was possible to contribute to the reduction of the basic unit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 村岡 久義 福岡県北九州市戸畑区牧山新町１番１号 大光炉材株式会社内 (72)発明者 澤田 秀明 福岡県北九州市戸畑区牧山新町１番１号 大光炉材株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisayoshi Muraoka 1-1 Makiyama Shinmachi, Tobata-ku, Kitakyushu, Fukuoka Daiko Furnace Co., Ltd. No. 1 Daiko Furnace Material Co., Ltd.
Claims (1)
なる不定形耐火物100重量％において、化学成分としてS
iCを50〜85重量％含有し、更にカーボンブラックを外割
１重量％から2.5重量％及び適当量の分散剤を添加した
高炉出銑樋カバー用流し込み不定形耐火物。1. A 100% by weight amorphous refractory material consisting of refractory aggregate, ultrafine refractory powder and a flocculant, S as a chemical component
A castable refractory for a blast furnace tappipe cover containing iC in an amount of 50 to 85% by weight and further containing 1% to 2.5% by weight of carbon black and an appropriate amount of a dispersant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63229199A JPH0822780B2 (en) | 1988-09-13 | 1988-09-13 | Casting amorphous refractory for blast furnace tappipe cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63229199A JPH0822780B2 (en) | 1988-09-13 | 1988-09-13 | Casting amorphous refractory for blast furnace tappipe cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0277510A JPH0277510A (en) | 1990-03-16 |
| JPH0822780B2 true JPH0822780B2 (en) | 1996-03-06 |
Family
ID=16888366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63229199A Expired - Fee Related JPH0822780B2 (en) | 1988-09-13 | 1988-09-13 | Casting amorphous refractory for blast furnace tappipe cover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0822780B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH066514B2 (en) * | 1989-08-11 | 1994-01-26 | 黒崎窯業株式会社 | Unshaped refractories for blast furnace cast bed desiliconization gutter |
| JP2510352B2 (en) * | 1990-11-06 | 1996-06-26 | ハリマセラミック株式会社 | Blast furnace tap iron cover covering method |
| JP4722200B2 (en) * | 2009-06-11 | 2011-07-13 | 株式会社長府製作所 | Air temperature controller |
| CN101885615B (en) * | 2010-06-08 | 2012-09-19 | 武汉科技大学 | C-Si-N silicon steel hearth roller sleeve and manufacture method thereof |
| JP4848472B2 (en) * | 2011-04-01 | 2011-12-28 | 株式会社長府製作所 | Method for separating first and second casings of air temperature controller |
| CN102674853B (en) * | 2012-05-15 | 2013-09-04 | 河南方圆炭素集团有限公司 | Graphite core for nickel iron electric furnace door |
| CN102838367B (en) * | 2012-10-08 | 2014-04-02 | 巩义市泰威高温陶瓷材料有限公司 | Resin-combined fine structure hearth roller sleeve and preparation method thereof |
| CN102838368B (en) * | 2012-10-08 | 2014-04-02 | 巩义市泰威高温陶瓷材料有限公司 | Fine structure silicon steel hearth roller sleeve and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5047825A (en) * | 1973-08-30 | 1975-04-28 | ||
| JPS57100983A (en) * | 1980-12-12 | 1982-06-23 | Sumitomo Metal Ind | Carbonaceous refractories for blast furnace bed |
-
1988
- 1988-09-13 JP JP63229199A patent/JPH0822780B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5047825A (en) * | 1973-08-30 | 1975-04-28 | ||
| JPS57100983A (en) * | 1980-12-12 | 1982-06-23 | Sumitomo Metal Ind | Carbonaceous refractories for blast furnace bed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0277510A (en) | 1990-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |