JP2020100853A - Monolithic refractory for blast furnace runner cover - Google Patents
Monolithic refractory for blast furnace runner cover Download PDFInfo
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- JP2020100853A JP2020100853A JP2018237807A JP2018237807A JP2020100853A JP 2020100853 A JP2020100853 A JP 2020100853A JP 2018237807 A JP2018237807 A JP 2018237807A JP 2018237807 A JP2018237807 A JP 2018237807A JP 2020100853 A JP2020100853 A JP 2020100853A
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Abstract
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本発明は、溶銑溶滓の飛散防止に用いる高炉樋カバー用不定形耐火物に関する。 TECHNICAL FIELD The present invention relates to an amorphous refractory for a blast furnace gutter cover used for preventing the spread of molten pig iron slag.
高炉出銑樋では、高炉から排出される溶銑溶滓の飛散を防止する為に高炉樋カバーが設置されており、高炉樋カバーの内側には鉄皮を保護する不定形耐火物が施工されている。 In the blast furnace tappipe, a blast furnace gutter cover is installed to prevent the scattering of molten pig iron slag discharged from the blast furnace, and an amorphous refractory that protects the steel shell is installed inside the blast furnace gutter cover. There is.
なかでも、高炉出銑口に最も近接した高炉樋カバーにおいては、(1)溶銑溶滓の飛沫によるアタック，(2)噴出ガスの二次燃焼による高温化，(3)出銑毎の高炉樋カバー着脱による加熱冷却等、非常に過酷な条件にさらされるため、耐火物が徐々に損耗し、背面赤熱もしくは耐火物の残存厚みがなくなることで高炉樋カバーの寿命となり、交換となる。
加えて近年では、高圧操業等から高出銑操業により溶銑溶滓の飛散が大きくなっている。
Among them, in the blast furnace gutter cover closest to the blast furnace tap hole, (1) attack by splash of molten pig iron slag, (2) high temperature by secondary combustion of blown gas, (3) blast furnace gutter for each tap iron Since the refractory is gradually exposed to extremely harsh conditions such as heating and cooling by removing and attaching the cover, the reddish heat of the back surface or the remaining thickness of the refractory disappears, and the life of the blast furnace gutter cover ends, and the cover is replaced.
In addition, in recent years, the spread of molten pig iron slag has been increasing due to high-pressure pig iron operation and the like.
溶銑溶滓の飛散は拡大する方向で、溶銑溶滓が高炉樋カバーに直接当たるようになってきた。そのため不定形耐火物の熱間摩耗による損耗と熱的スポーリングによる剥離が著しく、高炉樋カバーの稼動日数が低下する傾向にある。 The spread of molten pig iron slag is expanding, and the molten pig iron slag has come into direct contact with the blast furnace gutter cover. Therefore, the wear due to hot wear of the amorphous refractory and the peeling due to the thermal spalling are remarkable, and the number of operating days of the blast furnace gutter cover tends to decrease.
この対策として、例えば、特開平２−７７５１０号公報、特公平８−２２７８０号公報には，SiC-Al2O3系不定形耐火物で耐スポール性が向上する材料が提起されているが，高温での熱間強度の発現は低いという欠点がある。 As measures against this, for example, in JP-A-2-77510 and JP-B-8-22780, SiC-Al 2 O 3 type amorphous refractory materials having improved spall resistance are proposed. There is a drawback that the development of hot strength at high temperature is low.
また特開平３−８０１５９号公報には，Al2O3-SiC-C系不定形耐火物でも耐スポール性が向上する材料が提起されている。しかし，SiC-Al2O3系不定形耐火物、Al2O3-SiC-C系不定形耐火物とも高温での熱間強度向上は十分でなく，熱間摩耗するという問題がある。 Further, Japanese Patent Laid-Open No. 3-80159 proposes a material having improved spall resistance even with an Al 2 O 3 —SiC—C type amorphous refractory material. However, both SiC-Al 2 O 3 type amorphous refractory and Al 2 O 3 -SiC-C type amorphous refractory do not have sufficient improvement in hot strength at high temperatures and suffer from hot wear.
これらの不定形耐火物では，結合材としてアルミナセメントを配合したものが供されている。ところが、アルミナセメントの主成分であるCaOによりアノーサイト（CaO・Al2O3・2SiO2）等の低溶融点化合物が生成されてしまうため，高温での熱間強度が低下する問題がある。 For these irregular shaped refractories, alumina cement is used as a binder. However, since CaO, which is the main component of alumina cement, produces low melting point compounds such as anorthite (CaO.Al 2 O 3 .2SiO 2 ), there is a problem that the hot strength at high temperature is reduced.
高炉樋カバー用不定形耐火物には，高温での熱間強度、耐熱スポール性の高いものが求められている。
本発明は、上記特性が向上し、耐火物の損耗をより少なくすることで、高炉樋カバーの寿命を延ばすことを目的とする。
Amorphous refractory for blast furnace gutter cover is required to have high hot strength at high temperature and high heat resistant spall resistance.
An object of the present invention is to extend the life of the blast furnace gutter cover by improving the above characteristics and reducing the wear of refractory materials.
本発明品は、従来品に比較して高温での熱間強度、耐熱スポール性が高く、実使用時において稼動日数の延長が認められた。
また、高炉樋カバー以外に溶銑、溶鋼が直接触れ、耐火物が摩耗する設備においても稼動日数の延長を見込める。
The product of the present invention has higher hot strength at high temperature and higher heat-resistant spall resistance than the conventional product, and extension of the number of operating days was observed in actual use.
In addition to the blast furnace gutter cover, it is possible to expect an extension of the number of operating days in equipment where the hot metal and molten steel come into direct contact and the refractories wear.
本発明は上記目的を解決するため、耐火性骨材、耐火性超微粉および結合剤からなり，化学成分がAl2O3,SiC,SiO2,Cなどで構成され，Al2O3を主成分とする高炉樋カバー用不定形耐火物，または化学成分がAl2O3以外にSiC, SiO2,Cの１種類以上からなる高炉樋カバー用不定形耐火物であって，結合剤としてセメントを添加せずに，シリカゾル、高純度アルミナ骨材、超微粉アルミナを適量適用することで，熱間強度、耐スポール性の向上をみた。 Since the present invention is to solve the above object, refractory aggregate consists refractory ultrafine and a binder, the chemical components Al 2 O 3, SiC, is configured by a SiO 2, C, the Al 2 O 3 main Amorphous refractory for blast furnace gutter cover, or amorphous refractory for blast furnace gutter cover whose chemical component is one or more of SiC, SiO 2 and C in addition to Al 2 O 3 , and cement as binder By adding an appropriate amount of silica sol, high-purity alumina aggregate, and ultrafine alumina without adding, the hot strength and spall resistance were improved.
また，本発明は上記目的を達成するため、結合剤としてセメントを使用せず、シリカゾルのみを適用した高炉樋カバー用不定形耐火物である。シリカゾルとしてはSiO2固形分の濃度が40%のものが良好で、濃度が低いシリカゾルでは強度発現が不十分となる。
更にアルミナ含有量99％以上、Na2O含有量0.1％未満、粒径75μm以下の微粉アルミナ原料を適用した高炉樋カバー用不定形耐火物である。Na2O含有量を抑えることで高温度域に於ける液相生成を抑制し、熱間強度が向上する。
Further, in order to achieve the above object, the present invention is an amorphous refractory for a blast furnace gutter cover, which does not use cement as a binder and is applied only with silica sol. A silica sol having a SiO 2 solid content of 40% is preferable, and a silica sol having a low concentration has insufficient strength development.
Furthermore, it is an amorphous refractory for a blast furnace gutter cover to which a fine alumina raw material having an alumina content of 99% or more, a Na 2 O content of less than 0.1% and a particle size of 75 μm or less is applied. By suppressing the Na 2 O content, the liquid phase formation in the high temperature range is suppressed and the hot strength is improved.
上述のシリカゾルを適用した不定形耐火物に、平均粒径1μm以下の超微粉アルミナ原料を、不定形耐火物100重量％において3〜7重量％適用した高炉樋カバー用不定形耐火物である。超微粉アルミナ原料を3〜7重量％としたのは、3重量％未満では高温での熱間強度向上の効果が見られず、7重量％を超える添加量では混練時の流動性が低下し施工不良を招く為である。 An amorphous refractory for a blast furnace gutter cover, which is obtained by applying 3 to 7% by weight of ultrafine alumina raw material having an average particle size of 1 μm or less to 100% by weight of the irregular refractory to the irregular refractory to which the silica sol is applied. The ultrafine alumina raw material content was set to 3 to 7% by weight because when it is less than 3% by weight, the effect of improving hot strength at high temperatures is not observed, and when it is more than 7% by weight, fluidity during kneading decreases. This is because it leads to poor construction.
上述のシリカゾルを適用した不定形耐火物に、アルミナ含有量99％以上、Na2O含有量0.1％未満、粒径75μm以下の微粉アルミナ原料を適用し、平均粒径1μm以下の超微粉アルミナ原料を、不定形耐火物100重量％において3〜7重量％適用した高炉樋カバー用不定形耐火物である。 An amorphous refractory to which the silica sol described above is applied, an alumina content of 99% or more, a Na 2 O content of less than 0.1%, and a finely divided alumina raw material having a particle diameter of 75 μm or less is applied, and an ultrafine alumina raw material having an average particle diameter of 1 μm or less Is an amorphous refractory for a blast furnace gutter cover in which 3 to 7% by weight is applied to 100% by weight of the irregular refractory.
実施例3,7,9-11が本発明品である。
熱間強度は、予め1000℃3時間で予備焼成を行った40×40×160mmの供試体を、酸化雰囲気で1000℃30分保温した後、1450℃の炉に挿入、1時間保持した後に測定した。
耐熱スポール性は、予め1000℃3時間で予備焼成を行った230×114×65mmの並型れんがサイズの供試体を、1450℃保持の炉に試験体の3分の1を挿入し15分保持、その後水冷3分、空冷12分の加熱冷却を繰り返し，耐火物の外観を観察した。
Examples 3, 7, 9-11 are the products of the present invention.
The hot strength is measured after preheating the test piece at 1000°C for 3 hours with 40×40×160 mm test piece in an oxidizing atmosphere at 1000°C for 30 minutes, inserting it into a furnace at 1450°C and holding it for 1 hour. did.
Heat-resistant spall resistance is 230 × 114 × 65 mm standard brick size specimens pre-fired at 1000°C for 3 hours. Insert one-third of the specimen into a furnace at 1450°C and hold for 15 minutes. Then, heating and cooling were repeated for 3 minutes with water cooling and 12 minutes with air cooling, and the appearance of the refractory was observed.
実際に高炉出銑樋において、表1の実施例10を内張りした高炉樋カバーを用いて実用に供した。その結果を、従来品の結果と比較して、表2に示す。この表から明らかなように実施例１０は，従来品に比べて稼動日数で３日間延長し，優れた結果を示した。
The blast furnace tap gutter was actually put to practical use by using the blast furnace gutter cover lined with Example 10 in Table 1. The results are shown in Table 2 in comparison with the results of the conventional product. As is clear from this table, the working example of Example 10 was extended by 3 days in comparison with the conventional product and showed excellent results.
Claims (4)
An ultrafine alumina raw material having an Al 2 O 3 content of 99% or more, a Na 2 O content of less than 0.1% and a particle diameter of 75 μm or less is applied to claim 1, and an ultrafine alumina raw material having an average particle diameter of 1 μm or less is formed in an amorphous form. Amorphous refractory for blast furnace gutter cover applied at 3 to 7 wt% at 100 wt% refractory
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| JP2018237807A JP2020100853A (en) | 2018-12-19 | 2018-12-19 | Monolithic refractory for blast furnace runner cover |
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| JP2018237807A JP2020100853A (en) | 2018-12-19 | 2018-12-19 | Monolithic refractory for blast furnace runner cover |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7024147B1 (en) | 2021-08-06 | 2022-02-22 | 黒崎播磨株式会社 | Dry spraying material for firing furnaces |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63218586A (en) * | 1987-03-05 | 1988-09-12 | 日本鋼管株式会社 | Monolithic refractories |
| JPH02141480A (en) * | 1988-11-21 | 1990-05-30 | Kawasaki Refract Co Ltd | Castable refractory |
| JPH0948676A (en) * | 1995-08-04 | 1997-02-18 | Kawasaki Refract Co Ltd | Amorphous refractory for spraying |
| JPH0948675A (en) * | 1995-08-04 | 1997-02-18 | Kawasaki Refract Co Ltd | Amorphous refractory for apraying |
| JPH11240775A (en) * | 1998-02-27 | 1999-09-07 | Kawasaki Refract Co Ltd | Refractory composition for spraying execution and its execution |
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2018
- 2018-12-19 JP JP2018237807A patent/JP2020100853A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63218586A (en) * | 1987-03-05 | 1988-09-12 | 日本鋼管株式会社 | Monolithic refractories |
| JPH02141480A (en) * | 1988-11-21 | 1990-05-30 | Kawasaki Refract Co Ltd | Castable refractory |
| JPH0948676A (en) * | 1995-08-04 | 1997-02-18 | Kawasaki Refract Co Ltd | Amorphous refractory for spraying |
| JPH0948675A (en) * | 1995-08-04 | 1997-02-18 | Kawasaki Refract Co Ltd | Amorphous refractory for apraying |
| JPH11240775A (en) * | 1998-02-27 | 1999-09-07 | Kawasaki Refract Co Ltd | Refractory composition for spraying execution and its execution |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7024147B1 (en) | 2021-08-06 | 2022-02-22 | 黒崎播磨株式会社 | Dry spraying material for firing furnaces |
| WO2023013284A1 (en) * | 2021-08-06 | 2023-02-09 | 黒崎播磨株式会社 | Dry spraying material for firing furnace |
| JP2023024242A (en) * | 2021-08-06 | 2023-02-16 | 黒崎播磨株式会社 | Dry spray material for firing furnace |
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