CN102320845B - Al2O3-SiO2 tundish permeable brick and preparation method thereof - Google Patents
Al2O3-SiO2 tundish permeable brick and preparation method thereof Download PDFInfo
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- CN102320845B CN102320845B CN 201110231552 CN201110231552A CN102320845B CN 102320845 B CN102320845 B CN 102320845B CN 201110231552 CN201110231552 CN 201110231552 CN 201110231552 A CN201110231552 A CN 201110231552A CN 102320845 B CN102320845 B CN 102320845B
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Abstract
The invention relates to an Al2O3-SiO2 tundish permeable brick and a preparation method thereof. 65-78 wt% of tabular corundum particles, 7-20 wt% of mullite particles, 2-10 wt% of white corundum fine powder, 1-4 wt% of rho-Al2O3 fine powder, and 1-3 wt% of silicon micropowder are used as raw materials; 0.10-0.20 wt% of mixtures of sodium hexametaphosphate and sodium tripolyphosphate, 0.05-0.20 wt% of yellow dextrin, 0.01-0.20 wt% of azodicarbonamide, 1-4 wt% of Al2O3-SiO2 gel powder, and 0.20-1.0 wt% of aluminium fluoride are used as additives. The preparation method comprises the following steps: premixing the additives and silicon micropowder uniformly according to the contents, adding the tabular corundum particles and the mullite particles, mixing and grinding, adding the white corundum fine powder and rho-Al2O3 fine powder, mixing and grinding, adding 5-7 wt% of water, stirring, casting, molding, performing heat preservation at 110-200 DEG C for 12-48 hours, and finally sintering at 1200-1500 DEG C for 3 hours. The prepared permeable brick has good permeability and high strength, and is erosion-resistant and environment-friendly.
Description
Technical field
The invention belongs to Al
2O
3-SiO
2The fire resistant materials technical field.Be specifically related to a kind of Al
2O
3-SiO
2Matter ventilating brick of middle ladle and preparation method thereof.
Background technology
Development along with Technology of Tundish Metallurgy, gas permeable brick by being arranged on tundish bottom is blown into rare gas element in the molten steel and stirs, not only can effectively improve molten steel the residence time of flowing, extend molten steel, promote the mixing of molten steel and be beneficial to temperature even, and can utilize the micro-bubble of generation to catch inclusion, promote the floating of inclusion to remove, reduce total oxygen content in molten steel, be beneficial to the production of Clean Steel.Therefore, development has the tundish diffuse type gas permeable brick that fine air permeability, thermal shock resistance, high strength and the infiltration of anti-slag corrode becomes important problem.
There is the problem of the poor and poor thermal shock resistance of spalling in the basic material that uses in early stage gas permeable brick (MgO), therefore there be limited evidence currently of uses such product.By contrast, the corundum material has good high-temperature behavior, heat-shock resistance and the characteristics larger to the molten steel wetting angle, has become the main material that replaces magnesian.But in use erosion-resisting characteristics is poor due to pure corundum gas permeable brick, and the flake-off piece is serious, and people have carried out Al
2O
3The research of-MgO material.MgO adds with fine powder form usually, in sintering process and Al
2O
3The generation spinel that reacts, the coefficient of expansion of material increases and dense structure, though make erosion resistance and the oxidation-resistance raising of gas permeable brick, its ventilation property is had a strong impact on.
When guaranteeing diffuse type gas permeable brick ventilation property, make it have good high-temperature machinery intensity and refractoriness under load and thermal shock resistance.People have invented the corundum-mullite matter ventilating brick of middle ladle that the mullite crystal whisker original position strengthens, as " a kind of ventilating brick of middle ladle and preparation method thereof " (CN1699267A) patented technology mullite is added with the dry gel powder form, generate mullite crystal whisker, keep ventilation property, increased intensity.But dry gel powder be difficult for to disperse, and gas cell distribution is uneven, and is still a lot of than gross blow hole, and slag easily permeates to corrode and causes short-livedly, and the introducing of whisker also sealed a lot of perforation pores, and its efficient is still waiting to improve.
Summary of the invention
The present invention is intended to overcome the prior art defective, and purpose is to provide that a kind of apparent porosity is high, good permeability, and intensity is high, the Al of anti-thermal shock, anti-slag infiltration erosion, resistance to erosion, environmental friendliness and long service life
2O
3-SiO
2Matter ventilating brick of middle ladle and preparation method thereof.
For realizing above-mentioned task, the technical solution adopted in the present invention is: the raw material of this ventilating brick of middle ladle and quality percentage composition thereof are: the plate diamond spar particle of 65～78wt%, the mullite particle of 7～20wt%, the white fused alumina fine powder of 2～10wt%, ρ-Al of 1～4wt%
2O
3Fine powder, the silicon powder of 1～3wt%.
Take above-mentioned raw materials as mass percent, then add the Sodium hexametaphosphate 99 of following admixture: 0.10～0.20wt% and the mixture of tripoly phosphate sodium STPP, the yellow starch gum of 0.05～0.20wt%, the Cellmic C 121 of 0.01～0.20wt%, the Al of 1～4wt%
2O
3-SiO
2Gel powder, the aluminum fluoride of 0.20～1.0wt%.
Press the quality percentage composition of above-mentioned raw materials and admixture, first that admixture and silicon powder premix is even, make Preblend; With plate diamond spar particle, mullite particle and Preblend mixed grind, make the mixed grind material again; Then with white fused alumina fine powder, ρ-Al
2O
3Fine powder and mixed grind material mix, and add the water of above-mentioned raw materials 5～7wt%, stir, and cast, vibratory compaction, the base substrate after moulding is incubated 12～48 hours under 110～200 ℃ of conditions, burnt till in 3 hours under 1200～1500 ℃ of conditions at last.
In technique scheme: the Al of plate diamond spar particle
2O
3Content＞95wt%, its particle diameter are 3～0.088mm; The Al of mullite particle
2O
3Content＞65wt%, its particle diameter are 1～0.088mm; The Al of white fused alumina fine powder
2O
3Content＞99wt%, its particle diameter＜0.088mm; ρ-Al
2O
3The Al of fine powder
2O
3Content＞99wt%, its particle diameter＜0.01mm; The SiO of silicon powder
2Content＞92wt%, its particle diameter＜0.001mm; The mixture of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is Sodium hexametaphosphate 99: the mass ratio of tripoly phosphate sodium STPP is the mixture of 2: 1; Al
2O
3-SiO
2Gel powder be the sol-gel mullite precursor made gel, dry under 110 ℃ * 24h condition; The decomposition temperature of Cellmic C 121 is 120～180 ℃, its particle diameter＜0.005mm.
Owing to adopting technique scheme, the present invention can eliminate the reunion caking of Cellmic C 121 with Cellmic C 121 and silicon powder, yellow starch gum premix, guarantees its dispersiveness, and the environment of the slant acidity that builds has avoided the normal temperature of Cellmic C 121 to decompose; When thermal treatment, the Cellmic C 121 fast decoupled, utilize bubble ramp on polymer melt to produce very large tensile stress, produce original position expansion-rending effect, realize the Uniform Dispersion of aluminum oxide fine powder, mullite dry gel powder, yellow starch gum, silicon powder etc.Thus, equally distributed aluminum oxide fine powder and silicon powder reaction in－situ form more rational mullite network structure, the formation that mullite crystal whisker is better, length-to-diameter ratio is better, is more evenly distributed, and is difficult for stopping up pore, the ventilation property of larger lifting gas permeable brick and intensity, and slag is difficult for the infiltration erosion.The Al that the present invention is prepared
2O
3-SiO
2The apparent porosity of matter ventilating brick of middle ladle after burning till in 1200～1500 ℃ * 3 hours is 35～45%, mean pore size is that 1～10 μ m, Gas permeability are 20～40 μ m
2With compressive strength be 40～60MPa.
Therefore, the prepared gas permeable brick of this method has that apparent porosity is high, good permeability, intensity are high, the characteristics of anti-thermal shock, anti-slag infiltration erosion, resistance to erosion, environmental friendliness and long service life.
Embodiment
The invention will be further described below in conjunction with embodiment, is not the restriction to its protection domain.
For avoiding repetition, the first technical parameter unification of the raw material that this embodiment is related and admixture is described below, and repeats no more in embodiment:
The Al of plate diamond spar particle
2O
3Content＞95wt%, its particle diameter are 3～0.088mm; The Al of mullite particle
2O
3Content＞65wt%, its particle diameter are 1～0.088mm; The Al of white fused alumina fine powder
20
3Content＞99wt%, its particle diameter＜0.088mm; ρ-Al
2O
3The Al of fine powder
2O
3Content＞99wt%, its particle diameter＜0.01mm; The SiO of silicon powder
2Content＞92wt%, its particle diameter＜0.001mm; The mixture of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is Sodium hexametaphosphate 99: the mass ratio of tripoly phosphate sodium STPP is the mixture of 2: 1; Al
2O
3-SiO
2Gel powder be the sol-gel mullite precursor made gel, dry under 110 ℃ * 24h condition; The decomposition temperature of Cellmic C 121 is 120～180 ℃, its particle diameter＜0.005mm.
Embodiment 1
A kind of Al
2O
3-SiO
2Matter ventilating brick of middle ladle and preparation method thereof.The raw material of this ventilating brick of middle ladle and quality percentage composition thereof are: the plate diamond spar particle of 65～70wt%, the mullite particle of 15～20wt%, the white fused alumina fine powder of 8～10wt%, ρ-Al of 2～4wt%
2O
3Fine powder, the silicon powder of 2～3wt%.
Take above-mentioned raw materials as mass percent, then add the Sodium hexametaphosphate 99 of following admixture: 0.10～0.15wt% and the mixture of tripoly phosphate sodium STPP, the yellow starch gum of 0.05～0.10wt%, the Cellmic C 121 of 0.01～0.05wt%, the Al of 1～2wt%
2O
3-SiO
2Gel powder, the aluminum fluoride of 0.20～0.50wt%.
Press the quality percentage composition of above-mentioned raw materials and admixture, first that admixture and silicon powder premix is even, make Preblend; With plate diamond spar particle, mullite particle and Preblend mixed grind, make the mixed grind material again; Then with white fused alumina fine powder, ρ-Al
2O
3Fine powder and mixed grind material mix, and add the water of above-mentioned raw materials 5～6wt%, stir, and cast, vibratory compaction, the base substrate after moulding is incubated 24～48 hours under 110～160 ℃ of conditions, burnt till in 3 hours under 1200～1300 ℃ of conditions at last.
The prepared Al of the present embodiment 1
2O
3-SiO
2The apparent porosity of matter ventilating brick of middle ladle after burning till in 1300 ℃ * 3 hours is 35～40%, and mean pore size is 1～6 μ m, and Gas permeability is 20～28 μ m
2, compressive strength is 40～48MPa.
Embodiment 2
A kind of Al
2O
3-SiO
2Matter ventilating brick of middle ladle and preparation method thereof.The raw material of this ventilating brick of middle ladle and quality percentage composition thereof are: the plate diamond spar particle of 68～72wt%, the mullite particle of 12～18wt%, the white fused alumina fine powder of 7～9wt%, ρ-Al of 1～3wt%
2O
3Fine powder, the silicon powder of 2～3wt%.
Take above-mentioned raw materials as mass percent, then add the Sodium hexametaphosphate 99 of following admixture: 0.12～0.18wt% and the mixture of tripoly phosphate sodium STPP, the yellow starch gum of 0.08～0.13wt%, the Cellmic C 121 of 0.05～0.10wt%, the Al of 2～3wt%
2O
3-SiO
2Gel powder, the aluminum fluoride of 0.40～0.70wt%.
Press the quality percentage composition of above-mentioned raw materials and admixture, first that admixture and silicon powder premix is even, make Preblend; With plate diamond spar particle, mullite particle and Preblend mixed grind, make the mixed grind material again; Then with white fused alumina fine powder, ρ-Al
2O
3Fine powder and mixed grind material mix, and add the water of above-mentioned raw materials 6～7wt%, stir, and cast, vibratory compaction, the base substrate after moulding is incubated 12～24 hours under 150～200 ℃ of conditions, burnt till in 3 hours under 1300～1400 ℃ of conditions at last.
The prepared Al of the present embodiment 2
2O
3-SiO
2The apparent porosity of matter ventilating brick of middle ladle after burning till in 1400 ℃ * 3 hours is 38～42%, and mean pore size is 3～8 μ m, and Gas permeability is 25～32 μ m
2, compressive strength is 45～50MPa.
Embodiment 3
A kind of Al
2O
3-SiO
2Matter ventilating brick of middle ladle and preparation method thereof.The raw material of this ventilating brick of middle ladle and quality percentage composition thereof are: the plate diamond spar particle of 70～75wt%, the mullite particle of 10～17wt%, the white fused alumina fine powder of 5～8wt%, ρ-Al of 2～4wt%
2O
3Fine powder, the silicon powder of 1～2wt%.
Take above-mentioned raw materials as mass percent, then add the Sodium hexametaphosphate 99 of following admixture: 0.15～0.20wt% and the mixture of tripoly phosphate sodium STPP, the yellow starch gum of 0.10～0.15wt%, the Cellmic C 121 of 0.10～0.15wt%, the Al of 3～4wt%
2O
3-SiO
2Gel powder, the aluminum fluoride of 0.50～0.80wt%.
Press the quality percentage composition of above-mentioned raw materials and admixture, first that admixture and silicon powder premix is even, make Preblend; With plate diamond spar particle, mullite particle and Preblend mixed grind, make the mixed grind material again; Then with white fused alumina fine powder, ρ-Al
2O
3Fine powder and mixed grind material mix, and add the water of above-mentioned raw materials 5～6wt%, stir, and cast, vibratory compaction, the base substrate after moulding is incubated 24～48 hours under 110～160 ℃ of conditions, burnt till in 3 hours under 1400～1500 ℃ of conditions at last.
The prepared Al of the present embodiment 3
2O
3-SiO
2The apparent porosity of matter ventilating brick of middle ladle after burning till in 1500 ℃ * 3 hours is 40～44%, and mean pore size is 4～9 μ m, and Gas permeability is 28～35 μ m
2, compressive strength is 50～55MPa.
Embodiment 4
A kind of Al
2O
3-SiO
2Matter ventilating brick of middle ladle and preparation method thereof.The raw material of this ventilating brick of middle ladle and quality percentage composition thereof are: the plate diamond spar particle of 74～78wt%, the mullite particle of 7～15wt%, the white fused alumina fine powder of 2～7wt%, ρ-Al of 1～3wt%
2O
3Fine powder, the silicon powder of 1～2wt%.
Take above-mentioned raw materials as mass percent, then add the Sodium hexametaphosphate 99 of following admixture: 0.12～0.18wt% and the mixture of tripoly phosphate sodium STPP, the yellow starch gum of 0.14～0.20wt%, the Cellmic C 121 of 0.15～0.20wt%, the Al of 2～3wt%
2O
3-SiO
2Gel powder, the aluminum fluoride of 0.70～1.0wt%.
Press the quality percentage composition of above-mentioned raw materials and admixture, first that admixture and silicon powder premix is even, make Preblend; With plate diamond spar particle, mullite particle and Preblend mixed grind, make the mixed grind material again; Then with white fused alumina fine powder, ρ-Al
2O
3Fine powder and mixed grind material mix, and add the water of above-mentioned raw materials 6～7wt%, stir, and cast, vibratory compaction, the base substrate after moulding is incubated 12～24 hours under 150～200 ℃ of conditions, burnt till in 3 hours under 1300～1400 ℃ of conditions at last.
The prepared Al of the present embodiment 4
2O
3-SiO
2The apparent porosity of matter ventilating brick of middle ladle after burning till in 1400 ℃ * 3 hours is 42～45%, and mean pore size is 6～10 μ m, and Gas permeability is 32～40 μ m
2, compressive strength is 55～60MPa.
This embodiment can be eliminated the reunion caking of Cellmic C 121 with Cellmic C 121 and silicon powder, yellow starch gum premix, guarantees its dispersiveness, and the environment of the slant acidity that builds has avoided the normal temperature of Cellmic C 121 to decompose; When thermal treatment, the Cellmic C 121 fast decoupled, utilize bubble ramp on polymer melt to produce very large tensile stress, produce original position expansion-rending effect, realize the Uniform Dispersion of aluminum oxide fine powder, mullite dry gel powder, yellow starch gum, silicon powder etc.Thus, equally distributed aluminum oxide fine powder and silicon powder reaction in－situ form more rational mullite network structure, the formation that mullite crystal whisker is better, length-to-diameter ratio is better, is more evenly distributed, and is difficult for stopping up pore, the ventilation property of larger lifting gas permeable brick and intensity, and slag is difficult for the infiltration erosion.The Al that this embodiment is prepared
2O
3-SiO
2The apparent porosity of matter ventilating brick of middle ladle after burning till in 1200～1500 ℃ * 3 hours is 35～45%, mean pore size is that 1～10 μ m, Gas permeability are 20～40 μ m
2With compressive strength be 40～60MPa.
Therefore, the prepared Al of this embodiment
2O
3-SiO
2The matter ventilating brick of middle ladle has that apparent porosity is high, good permeability, intensity are high, the characteristics of anti-thermal shock, anti-slag infiltration erosion, resistance to erosion, environmental friendliness and long service life.
Claims (1)
1. Al
2O
3-SiO
2The preparation method of matter ventilating brick of middle ladle is characterized in that the raw material of this ventilating brick of middle ladle and quality percentage composition thereof are: the plate diamond spar particle of 65～78wt%, the mullite particle of 7～20wt%, the white fused alumina fine powder of 2～10wt%, ρ-Al of 1～4wt%
2O
3Fine powder, the silicon powder of 1～3wt%;
Take above-mentioned raw materials as mass percent, then add the Sodium hexametaphosphate 99 of following admixture: 0.10～0.20wt% and the mixture of tripoly phosphate sodium STPP, the yellow starch gum of 0.05～0.20wt%, the Cellmic C 121 of 0.01～0.20wt%, the Al of 1～4wt%
2O
3-SiO
2Gel powder, the aluminum fluoride of 0.20～1.0wt%;
Press the quality percentage composition of above-mentioned raw materials and admixture, first that admixture and silicon powder premix is even, make Preblend; With plate diamond spar particle, mullite particle and Preblend mixed grind, make the mixed grind material again; Then with white fused alumina fine powder, ρ-Al
2O
3Fine powder and mixed grind material mix, and add the water of above-mentioned raw materials 5～7wt%, stir, and cast, vibratory compaction, the base substrate after moulding is incubated 12～48 hours under 110～200 ℃ of conditions, burnt till in 3 hours under 1200～1500 ℃ of conditions at last;
The Al of described plate diamond spar particle
2O
3Content〉95wt%, its particle diameter is 3～0.088mm;
The Al of described mullite particle
2O
3Content〉65wt%, its particle diameter is 1～0.088mm;
The Al of described white fused alumina fine powder
2O
3Content〉99wt%, its particle diameter＜0.088mm;
Described ρ-Al
2O
3The Al of fine powder
2O
3Content〉99wt%, its particle diameter＜0.01mm;
The SiO of described silicon powder
2Content〉92wt%, its particle diameter＜0.001mm;
The mixture of described Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is Sodium hexametaphosphate 99: the mass ratio of tripoly phosphate sodium STPP is the mixture of 2: 1;
Described Al
2O
3-SiO
2Gel powder be the sol-gel mullite precursor made gel, dry under 110 ℃ * 24h condition;
The decomposition temperature of described Cellmic C 121 is 120～180 ℃, its particle diameter＜0.005mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110231552 CN102320845B (en) | 2011-08-12 | 2011-08-12 | Al2O3-SiO2 tundish permeable brick and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110231552 CN102320845B (en) | 2011-08-12 | 2011-08-12 | Al2O3-SiO2 tundish permeable brick and preparation method thereof |
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|---|---|
| CN102320845A CN102320845A (en) | 2012-01-18 |
| CN102320845B true CN102320845B (en) | 2013-06-05 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103553578B (en) * | 2013-10-23 | 2015-08-19 | 洛阳利尔耐火材料有限公司 | A kind of gel is in conjunction with easy fired gas permeable brick and preparation technology thereof |
| CN104446566B (en) * | 2014-12-16 | 2016-08-24 | 江苏苏嘉集团新材料有限公司 | Degasification sheet for jet refined metals liquid and preparation method thereof |
| CN108017379A (en) * | 2017-11-06 | 2018-05-11 | 宜兴摩根热陶瓷有限公司 | A kind of aluminum oxide lightweight thermal insulation brick and preparation method thereof |
| CN108285338A (en) * | 2018-04-04 | 2018-07-17 | 宜兴市国强炉业有限公司 | A kind of high-strength and high ductility high temperature abrasion material |
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|---|---|---|---|---|
| EP0686611A1 (en) * | 1994-06-08 | 1995-12-13 | Taiko Refractories Co., Ltd. | Castable refractory material |
| CN1699267A (en) * | 2005-06-17 | 2005-11-23 | 武汉科技大学 | Tundish permeable brick and its preparing process |
| CN101121602A (en) * | 2007-07-25 | 2008-02-13 | 濮阳濮耐高温材料（集团）股份有限公司 | Dispersion type magnesium air brick for bakie |
-
2011
- 2011-08-12 CN CN 201110231552 patent/CN102320845B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0686611A1 (en) * | 1994-06-08 | 1995-12-13 | Taiko Refractories Co., Ltd. | Castable refractory material |
| CN1699267A (en) * | 2005-06-17 | 2005-11-23 | 武汉科技大学 | Tundish permeable brick and its preparing process |
| CN101121602A (en) * | 2007-07-25 | 2008-02-13 | 濮阳濮耐高温材料（集团）股份有限公司 | Dispersion type magnesium air brick for bakie |
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| Title |
|---|
| "中间包用透气砖的生产工艺及使用经验";刘景林;《耐火与石灰》;20090831;第34卷(第4期);第26-27页 * |
| "莫来石轻质耐火材料的制备";董童霖;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20100315(第03期);第18页 * |
| 刘景林."中间包用透气砖的生产工艺及使用经验".《耐火与石灰》.2009,第34卷(第4期),第26-27页. |
| 董童霖."莫来石轻质耐火材料的制备".《中国优秀硕士学位论文全文数据库 工程科技I辑》.2010,(第03期),第18页. |
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