CN1417351A - Cast refractory material for blast furnace draught pipes (gooseneck pipe, bent tube and direct-firing pipe) - Google Patents
Cast refractory material for blast furnace draught pipes (gooseneck pipe, bent tube and direct-firing pipe) Download PDFInfo
- Publication number
- CN1417351A CN1417351A CN 01133638 CN01133638A CN1417351A CN 1417351 A CN1417351 A CN 1417351A CN 01133638 CN01133638 CN 01133638 CN 01133638 A CN01133638 A CN 01133638A CN 1417351 A CN1417351 A CN 1417351A
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- China
- Prior art keywords
- blast furnace
- gooseneck
- pipe
- castable
- elbow
- Prior art date
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Abstract
The present invention discloses an unformed refractory material for blast furnace draught pipes and with high heat stability, high strength and high hot air flow erosion resistance. The cast material is mixture of sintered bauxite and magnesite with reasonable grain size distribution as raw material and fine silica powder as admixture and binder and through mechanical stirring. When used, the mixture is mixed with water, cast and vibrated to form and dried. It is used as the material for lining of blast furnace draught pipes.
Description
The invention relates to an unshaped refractory material for blast furnace air supply pipelines (gooseneck, elbow and belly pipe).
The current conditions of refractorymaterials for the inner lining of blast furnace air supply pipelines (gooseneck, elbow and belly pipe) are as follows: the small and medium blast furnaces generally adopt clay water glass or a ramming material combined with phosphoric acid; the large blast furnace is generally made of high-alumina or corundum refractory castable. The materials have the defects of poor thermal stability, no high temperature air flow scouring resistance, low strength and the like, and are easy to generate cracks to cause the air duct to be red, so the service life is short, generally 1-2 months, and the materials need to be frequently replaced in the production process, thereby influencing the normal production of the blast furnace.
The invention aims to provide a refractory castable for the inner lining of blast furnace air supply pipelines (gooseneck, elbow and belly pipe) with good thermal stability, high temperature airflow scouring resistance and high strength, so as to prolong the service life of the castable and ensure the normal production of a blast furnace.
The purpose of the invention is realized as follows: sintered alumina and sintered magnesia with reasonable grain size distribution are used as raw materials, silicon micropowder is used as an additive and a bonding agent, and the raw materials are mechanically stirred into dry uniform aggregate, wherein the weight proportion of the aggregate is as follows:
sintered alumina (0-8 mm): 50-90
Sintered magnesite (0-1 mm): 5-25
Silicon micropowder: 1-10 application method comprises adding water, stirring, casting, vibrating, molding, drying, maintaining for 24 hr, and oven drying at 300 deg.C. In the using process of the castable, sintering reaction is carried out under the action of high-temperature gas (1000-;
| chemical composition% | Al2O3 | ≥65 |
| Bulk density g/cm3 | 110℃×24h | ≥2.60 |
| 1500℃×3h | ≥2.55 | |
| Flexural strength Mpa | 110℃×24h | ≥3.0 |
| 1500℃×3h | ≥9.0 | |
| Compressive strength Mpa | 110℃×24h | ≥30 |
| 1500℃×3 | ≥60 | |
| Linear rate of change after firing% | 1400℃×3 | ±0.5 |
| Thermal shock stability (second time) | 1100 ℃ water cooling | ≥25 |
By adopting the scheme, the castable has the characteristics of good thermal stability, high temperature airflow scouring resistance, high strength and the like, can be used for medium-sized and large-sized blast furnace air supply pipelines (gooseneck, elbow and belly pipe), has the service life of 10-12 months, and is 5-6 times longer than the service life of the existing refractory material for the blast furnace air supply pipeline lining.
Claims (4)
1. A castable for the inner lining of blast furnace air supply pipelines (gooseneck, elbow and belly pipe) is prepared from sintered alumina and magnesia with reasonable grain size distribution as raw materials, and silicon micropowder as admixture and binder through mechanical stirring to form dry uniform aggregate, and is characterized in that: good thermal stability, high-temperature airflow scouring resistance and high strength. The service life is more than 10 months.
2. The castable for the inner liner of a blast furnace supply air duct (gooseneck, elbow, belly pipe) according to claim 1, wherein: 50-90% of sintered alumina, 5-25% of sintered magnesia and 1-10% of silicon micropowder.
3. The castable for the inner liner of a blast furnace supply air duct (gooseneck, elbow, belly pipe) according to claim 1, wherein: adding sintered magnesia into the raw materials, and taking silicon micropowder as an additive and a bonding agent.
4. The castable for the inner liner of a blast furnace supply air duct (gooseneck, elbow, belly pipe) according to claim 1, wherein: sintering the mixture into mineral mainly comprising sillimanite and magnesia alumina spinel under the action of high-temperature gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133638 CN1417351A (en) | 2001-11-06 | 2001-11-06 | Cast refractory material for blast furnace draught pipes (gooseneck pipe, bent tube and direct-firing pipe) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133638 CN1417351A (en) | 2001-11-06 | 2001-11-06 | Cast refractory material for blast furnace draught pipes (gooseneck pipe, bent tube and direct-firing pipe) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1417351A true CN1417351A (en) | 2003-05-14 |
Family
ID=4671976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01133638 Pending CN1417351A (en) | 2001-11-06 | 2001-11-06 | Cast refractory material for blast furnace draught pipes (gooseneck pipe, bent tube and direct-firing pipe) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1417351A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058669A (en) * | 2011-10-19 | 2013-04-24 | 贵阳联合高温材料有限公司 | Metallurgy electromagnetic induction intermediate frequency furnace ramming material |
| CN103276130A (en) * | 2013-05-29 | 2013-09-04 | 新兴铸管股份有限公司 | Maintenance method for air leakage from pipeline of hot-air system of blast furnace |
| CN103508740A (en) * | 2012-06-29 | 2014-01-15 | 上海梅山钢铁股份有限公司 | Ramming mass for repairing gap bridge magnesia-alumina spinel bricks of sleeve lime kiln |
| CN107043246A (en) * | 2017-02-08 | 2017-08-15 | 焦作金鑫恒拓新材料股份有限公司 | A kind of hot semidry method spray paint of mixed iron blast |
| CN109576425A (en) * | 2017-09-29 | 2019-04-05 | 上海宝钢工业技术服务有限公司 | The rubescent processing method of blast furnace gooseneck position shell high temperature |
| CN114105618A (en) * | 2021-12-24 | 2022-03-01 | 长兴兴鹰新型耐火建材有限公司 | Thermal shock-resistant, corrosion-resistant and wear-resistant castable for decomposing furnace gooseneck |
-
2001
- 2001-11-06 CN CN 01133638 patent/CN1417351A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058669A (en) * | 2011-10-19 | 2013-04-24 | 贵阳联合高温材料有限公司 | Metallurgy electromagnetic induction intermediate frequency furnace ramming material |
| CN103508740A (en) * | 2012-06-29 | 2014-01-15 | 上海梅山钢铁股份有限公司 | Ramming mass for repairing gap bridge magnesia-alumina spinel bricks of sleeve lime kiln |
| CN103508740B (en) * | 2012-06-29 | 2015-05-20 | 上海梅山钢铁股份有限公司 | Ramming mass for repairing gap bridge magnesia-alumina spinel bricks of sleeve lime kiln |
| CN103276130A (en) * | 2013-05-29 | 2013-09-04 | 新兴铸管股份有限公司 | Maintenance method for air leakage from pipeline of hot-air system of blast furnace |
| CN103276130B (en) * | 2013-05-29 | 2015-10-28 | 新兴铸管股份有限公司 | Maintenance method for air leakage from pipeline of hot-air system of blast furnace |
| CN107043246A (en) * | 2017-02-08 | 2017-08-15 | 焦作金鑫恒拓新材料股份有限公司 | A kind of hot semidry method spray paint of mixed iron blast |
| CN109576425A (en) * | 2017-09-29 | 2019-04-05 | 上海宝钢工业技术服务有限公司 | The rubescent processing method of blast furnace gooseneck position shell high temperature |
| CN114105618A (en) * | 2021-12-24 | 2022-03-01 | 长兴兴鹰新型耐火建材有限公司 | Thermal shock-resistant, corrosion-resistant and wear-resistant castable for decomposing furnace gooseneck |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |