CN102432316B - Carbon brick used for blast-furnace bottom hearth and its preparation method - Google Patents
Carbon brick used for blast-furnace bottom hearth and its preparation method Download PDFInfo
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- CN102432316B CN102432316B CN 201110279205 CN201110279205A CN102432316B CN 102432316 B CN102432316 B CN 102432316B CN 201110279205 CN201110279205 CN 201110279205 CN 201110279205 A CN201110279205 A CN 201110279205A CN 102432316 B CN102432316 B CN 102432316B
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Abstract
The invention relates to a carbon brick used for a blast-furnace bottom hearth and its preparation method. According to the technical scheme of the invention, the carbon brick comprises the following raw materials: 30-45 wt% of electrically calcined anthracite, 18-30 wt% of amorphous graphite, 33-42 wt% of blended powder, and additionally a binder of thermosetting phenolic resin accounting for 10-20 wt% of the above materials. The method comprises: according to the content of the above raw materials and binder, subjecting electrically calcined anthracite and amorphous graphite to mixed milling for 3-5min, then adding thermosetting phenolic resin for 5-7min of mixed milling, then adding blended powder for 15-40min of mixed milling, conducting compression molding or vibration molding, then carrying out drying at a temperature of 180-220DEG C, and finally performing sintering in an embedded carbon atmosphere at a temperature of 1200-1500DEG C. The method of the invention is characterized by low production cost and simple technology. And the prepared carbon brick used for a blast-furnace bottom hearth has a molten iron corrosion resisting index less than 7%, thermal conductivity over 30W/(m.K) and a volume of pores less than 1 micrometer over 80%. Therefore, the carbon brick used for a blast-furnace bottom hearth has excellent molten iron corrosion resistance, high thermal conductivity and high microporosity.
Description
Technical field
The invention belongs to technical field of refractory materials, be specifically related at the bottom of a kind of State of Blast Furnace cupola well with brick fuel and preparation method thereof.
Background technology
Along with the fast development of Iron And Steel Industry and the continuous progress of ironmaking technology, blast furnace develops to maximization, longevityization direction.The key link of restriction blast furnace longevity generally believes it is cupola well furnace bottom position, this is because behind the modernized large blast furnace strengthening smelting, molten iron circulation causes huge erosion damage effect to the cupola well furnace bottom, molten iron very easily is penetrated in the bricking along brickwork joint and hole, to bricking cause serious erosion and repair difficult unusually, thereby had a strong impact on blast furnace campaign.Therefore for the cupola well furnace bottom, it is particularly important that the brick fuel quality seems, life-span that we can say brick fuel has determined the life-span of blast furnace.
" a kind of high corrosion resistant porous baked carbon brick that is used for blast furnace lining " (ZL00116085.0) and " the micropore self-baked charcoal brick that is used for ironmaking blast furnace lining " (ZL00116084.2) patented technology, in traditional brick fuel, introduce metallic titanium powder, not only raw materials used metallic titanium powder costs an arm and a leg, cause the production cost of brick fuel to increase, and the resistance to fouling of brick fuel improve very little; " a kind of ironmaking blast furnace lining carbon brick and preparation method thereof " be patented technology (ZL200410061026.3), introduces titanium dioxide powder in brick fuel, has improved the solidity to corrosion of brick fuel to a certain extent, but can not satisfy the requirement of modern large blast furnace; " furnace lining with ultramicropore brick fuel and manufacture method " thereof be patented technology (ZL200410026087.6), though＜1 μ m pore volume arrives more than 80%, and its molten iron corrosion rate is higher, is 20%; " blast furnace carbon brick of a kind of molten iron erosion-resisting and preparation method thereof " be patented technology (CN200910063095.0), the molten iron corrosion rate of prepared brick fuel is about 15%, " a kind of Carboneous fire-resistant material for furnace brick lining and preparation method thereof " be patented technology (CN200910060989.4), substitute the main raw material of electro-forge hard coal with amorphous graphite, only improved the micropore rate and the erosion-resisting characteristics (its anti-corrosion index is greater than 9%) of brick fuel to a certain extent as the preparation brick fuel; Other has employing that brick fuel be impregnated in to contain in the zirconic solution (Materials and Corrosion, 2005,56:475-480), though improved its resistance to fouling to a certain extent, but its complicated process of preparation, production cost is higher, is unfavorable for the reduction of blast furnace ironmaking cost.
Summary of the invention
The present invention is intended to overcome the prior art defective, purpose provides at the bottom of the low and simple State of Blast Furnace of preparation technology of a kind of production cost cupola well with the preparation method of brick fuel, and cupola well has the characteristics of anti-hot metal erosion excellence, high heat conductance and high micropore rate at the bottom of the State of Blast Furnace for preparing with this method with brick fuel.
For achieving the above object, the technical solution used in the present invention is: the raw material and the percentage composition thereof of described brick fuel are: electric calcined anthracite is 30～45wt%, amorphous graphite 18～30wt%, blend powder 33～42wt%; The heat-reactive phenolic resin that adds above-mentioned raw materials 10～20wt% is a wedding agent.
The preparation method of described brick fuel is: the quality percentage composition of pressing above-mentioned raw materials and wedding agent, earlier with electro-forge hard coal and amorphous graphite mixed grind 3～5 minutes, add heat-reactive phenolic resin again and carry out mixed grind, the mixed grind time is 5～7 minutes, add the blend powder then, mixed grind 15～40 minutes, compression molding or vibratory compaction, dry under 180～220 ℃ of conditions after the moulding, burn till burying under charcoal atmosphere and 1200～1500 ℃ of conditions at last.
The granularity d of described amorphous graphite＜1mm (d represents granularity, down together); The anthracitic grain composition of electro-forge is: 5＜d≤3mm accounts for 30～40%, and 3＜d≤1mm accounts for 60～70%.
The preparation method of described blend powder is: with the natural flake graphite of 10～35wt%, the simple substance silica flour of 12～32wt%, α-Al of 10～25wt%
2O
3The metallic aluminium powder of micro mist, 5～16wt% and the zircon micropowder of 13～45wt% mixed 60～90 minutes; Wherein: the granularity d of natural flake graphite＜0.074mm, the granularity d of simple substance silica flour＜0.045mm, α-Al
2O
3The mean particle size d of micro mist＜0.005mm, the granularity d of metallic aluminium powder＜0.074mm, the mean particle size d of zircon micropowder＜0.005mm.
Because adopt technique scheme, the raw materials used zircon micropowder price of the present invention is relatively cheap, effectively reduces production cost; With burn till after again dipping contain ZrO
2The preparation method of solution compares, and preparation method of the present invention is simple.Zircon micropowder at high temperature decomposition in situ forms zirconium white and unbodied silicon-dioxide, formed zirconium white is distributed in the matrix of brick fuel equably, help strengthening the anti-hot metal erosion of brick fuel, the soft silica of Xing Chenging forms more silicon carbide burying under the charcoal atmosphere with CO reaction original position simultaneously, and become network structure to distribute, fill pore, it helps the raising of brick fuel thermal conductivity and micropore rate, further improve its anti-hot metal erosion, cupola well anti-molten iron corrosion index＜7% of brick fuel at the bottom of the prepared State of Blast Furnace, thermal conductivity reaches above and＜1 μ m pore volume of 30W/ (mK) greater than 80%
Therefore, preparation technology of the present invention is simple and production cost is low, and cupola well has the anti-molten iron infiltration of high heat conductance, high micropore rate and excellence and the characteristics of corrosion performance with brick fuel at the bottom of the prepared State of Blast Furnace.
Embodiment
The invention will be further described below in conjunction with embodiment, is not the restriction to its protection domain.
For avoiding repetition, existing technical parameter unification with the related raw material of this embodiment is described below, and repeats no more among the embodiment: the granularity d of amorphous graphite＜1mm (d represents granularity, down together); The anthracitic grain composition of electro-forge is: 5＜d≤3mm accounts for 30～40%, and 3＜d≤1mm accounts for 60～70%.
The preparation method of blend powder is: with the natural flake graphite of 10～35wt%, the simple substance silica flour of 12～32wt%, α-Al of 10～25wt%
2O
3The metallic aluminium powder of micro mist, 5～16wt% and the zircon micropowder of 13～45wt% mixed 60～90 minutes; Wherein: the granularity d of natural flake graphite＜0.074mm, the granularity d of simple substance silica flour＜0.045mm, α-Al
2O
3The mean particle size d of micro mist＜0.005mm, the granularity d of metallic aluminium powder＜0.074mm, the mean particle size d of zircon micropowder＜0.005mm.
Embodiment 1
The cupola well preparation method of brick fuel at the bottom of a kind of State of Blast Furnace, the raw material and the percentage composition thereof that it is characterized in that described brick fuel are: electro-forge hard coal 40～45wt%, amorphous graphite 22～26wt%, blend powder 33～36wt%, the heat-reactive phenolic resin that adds above-mentioned raw materials 10～14wt% is a wedding agent.
The preparation method of described brick fuel is: the quality percentage composition of pressing above-mentioned raw materials and wedding agent, earlier with electro-forge hard coal and amorphous graphite mixed grind 3～5 minutes, add heat-reactive phenolic resin again and carry out mixed grind, the mixed grind time is 5～7 minutes, add the blend powder then, mixed grind 15～40 minutes, compression molding, dry under 180～220 ℃ of conditions after the moulding, burn till burying under charcoal atmosphere and 1200～1300 ℃ of conditions at last.
At the bottom of the prepared State of Blast Furnace of present embodiment cupola well with brick fuel after testing, anti-molten iron corrosion index 6.4～6.7%, thermal conductivity (600 ℃) is 30～34.4W/ (mK), mean pore size is 0.086～0.096 μ m,＜1 μ m pore volume is 80.2～84.3%.
Embodiment 2
The cupola well preparation method of brick fuel at the bottom of a kind of State of Blast Furnace, the raw material and the percentage composition thereof that it is characterized in that described brick fuel are: electro-forge hard coal 35～40wt%, amorphous graphite 22～26wt%, blend powder 36～39wt%, the heat-reactive phenolic resin that adds above-mentioned raw materials 12～16wt% is a wedding agent.
Preparation technology is except that burning till under burying charcoal atmosphere and 1300～1400 ℃ of conditions at last, and all the other are with embodiment 1.
At the bottom of the prepared State of Blast Furnace of present embodiment cupola well with brick fuel after testing, anti-molten iron corrosion index 6.3～6.6%, thermal conductivity (600 ℃) is 31.8～35.4W/ (mK), mean pore size is 0.084～0.092 μ m,＜1 μ m pore volume is 82.2～85.3%.
Embodiment 3
The cupola well preparation method of brick fuel at the bottom of a kind of State of Blast Furnace, the raw material and the percentage composition thereof that it is characterized in that described brick fuel are: electro-forge hard coal 30～35wt%, amorphous graphite 26～30wt%, blend powder 39～42wt%, the heat-reactive phenolic resin that adds above-mentioned raw materials 16～20wt% is a wedding agent.
Preparation technology is except that burning till under burying charcoal atmosphere and 1400～1500 ℃ of conditions at last, and all the other are with embodiment 1.
At the bottom of the prepared State of Blast Furnace of present embodiment cupola well with brick fuel after testing, anti-molten iron corrosion index 6.4～6.6%, thermal conductivity (600 ℃) is 32.6～36.4W/ (mK), mean pore size is 0.089～0.097 μ m,＜1 μ m pore volume is 80.5～83.3%.
Embodiment 4
The cupola well preparation method of brick fuel at the bottom of a kind of State of Blast Furnace, the raw material and the percentage composition thereof that it is characterized in that described brick fuel are: electro-forge hard coal 40～45wt%, amorphous graphite 18～22wt%, blend powder 36～39wt%, the heat-reactive phenolic resin that adds above-mentioned raw materials 11～15wt% is a wedding agent.
Preparation technology removes vibratory compaction, and outside burning till under burying charcoal atmosphere and 1200～1300 ℃ of conditions, all the other are with embodiment 1.
At the bottom of the prepared State of Blast Furnace of present embodiment cupola well with brick fuel after testing, anti-molten iron corrosion index 6.0～6.3%, thermal conductivity (600 ℃) is 32.6～36.4W/ (mK), mean pore size is 0.074～0.086 μ m,＜1 μ m pore volume is 82.5～86.3%.
Embodiment 5
The cupola well preparation method of brick fuel at the bottom of a kind of State of Blast Furnace, the raw material and the percentage composition thereof that it is characterized in that described brick fuel are: electro-forge hard coal 33～38wt%, amorphous graphite 23～27wt%, blend powder 38～41wt%, the heat-reactive phenolic resin that adds above-mentioned raw materials 14～18wt% is a wedding agent.
Preparation technology removes vibratory compaction, and outside burning till under burying charcoal atmosphere and 1300～1400 ℃ of conditions, all the other are with embodiment 1.
At the bottom of the prepared State of Blast Furnace of present embodiment cupola well with brick fuel after testing, anti-molten iron corrosion index 6.7～7.0%, thermal conductivity (600 ℃) is 33.6～36.8W/ (mK), mean pore size is 0.076～0.088 μ m,＜1 μ m pore volume is 81.5～85.4%.
Embodiment 6
The cupola well preparation method of brick fuel at the bottom of a kind of State of Blast Furnace, the raw material and the percentage composition thereof that it is characterized in that described brick fuel are: electro-forge hard coal 36～41wt%, amorphous graphite 25～29wt%, blend powder 33～36wt%, the heat-reactive phenolic resin that adds above-mentioned raw materials 16～20wt% is a wedding agent.
Preparation technology removes vibratory compaction, and outside burning till under burying charcoal atmosphere and 1400～1500 ℃ of conditions, all the other are with embodiment 1.
At the bottom of the prepared State of Blast Furnace of present embodiment cupola well with brick fuel after testing, anti-molten iron corrosion index 6.1～6.4%, thermal conductivity (600 ℃) is 34.6～37.8W/ (mK), mean pore size is 0.080～0.092 μ m,＜1 μ m pore volume is 80～83.4%.
The raw materials used zircon micropowder price of this embodiment is relatively cheap, effectively reduces production cost; With burn till after again dipping contain ZrO
2The preparation method of solution compares, and preparation method of the present invention is simple.Zircon micropowder at high temperature decomposition in situ forms zirconium white and unbodied silicon-dioxide, formed zirconium white is distributed in the matrix of brick fuel equably, help strengthening the anti-hot metal erosion of brick fuel, the soft silica of Xing Chenging forms more silicon carbide burying under the charcoal atmosphere with CO reaction original position simultaneously, and become network structure to distribute, fill pore, it helps the raising of brick fuel thermal conductivity and micropore rate, further improve its anti-hot metal erosion, cupola well anti-molten iron corrosion index＜7% of brick fuel at the bottom of the prepared State of Blast Furnace, thermal conductivity reaches above and＜1 μ m pore volume of 30W/ (mK) greater than 80%
Therefore, the preparation technology of this embodiment is simple and production cost is low, and cupola well has the anti-molten iron infiltration of high heat conductance, high micropore rate and excellence and the characteristics of corrosion performance with brick fuel at the bottom of the prepared State of Blast Furnace.
Claims (3)
1. cupola well is with the preparation method of brick fuel at the bottom of the State of Blast Furnace, and it is characterized in that the raw material of described brick fuel and percentage composition thereof are: electric calcined anthracite is 30 ~ 45wt%, amorphous graphite 18 ~ 30wt%, blend powder 33 ~ 42wt%; The heat-reactive phenolic resin that adds above-mentioned raw materials 10 ~ 20wt% is a wedding agent;
The preparation method of described brick fuel is: the quality percentage composition of pressing above-mentioned raw materials and wedding agent, earlier with electric calcined anthracite and amorphous graphite mixed grind 3 ~ 5 minutes, add heat-reactive phenolic resin again and carry out mixed grind, the mixed grind time is 5 ~ 7 minutes, add the blend powder then, mixed grind 15 ~ 40 minutes, compression molding or vibratory compaction, dry under 180 ~ 220 ℃ of conditions after the moulding, burn till burying under charcoal atmosphere and 1200 ~ 1500 ℃ of conditions at last;
The preparation method of described blend powder is: with the natural flake graphite of 10 ~ 35wt%, the simple substance silica flour of 12 ~ 32wt%, α-Al of 10 ~ 25wt%
2O
3The metallic aluminium powder of micro mist, 5 ~ 16wt% and the zircon micropowder of 13 ~ 45wt% mixed 60 ~ 90 minutes.
2. cupola well is characterized in that the granularity d＜1mm of described amorphous graphite with the preparation method of brick fuel at the bottom of the State of Blast Furnace according to claim 1.
3. cupola well is characterized in that the granularity d of described natural flake graphite with the preparation method of brick fuel at the bottom of the State of Blast Furnace according to claim 1＜0.074mm, the granularity d of simple substance silica flour＜0.045mm, α-Al
2O
3The mean particle size d of micro mist＜0.005mm, the granularity d of metallic aluminium powder＜0.074mm, the mean particle size d of zircon micropowder＜0.005mm.
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| CN103242050A (en) * | 2013-05-13 | 2013-08-14 | 昆山思创耐火材料有限公司 | Carbon brick with high thermal conductivity for iron-smelting blast furnace lining, and preparation method thereof |
| CN103613393B (en) * | 2013-11-11 | 2017-06-16 | 中冶南方邯郸武彭炉衬新材料有限公司 | A kind of blast furnace lining brick fuel and preparation method thereof |
| CN107266096A (en) * | 2017-07-26 | 2017-10-20 | 中冶南方邯郸武彭炉衬新材料有限公司 | A kind of blast furnace carbon brick and preparation method thereof |
| CN109704774B (en) * | 2018-11-28 | 2020-01-10 | 北京精冶源新材料股份有限公司 | Preparation method of high-thermal-conductivity castable for hearth of blast furnace bottom instead of carbon brick |
| CN111647699A (en) * | 2020-07-04 | 2020-09-11 | 中冶南方邯郸武彭炉衬新材料有限公司 | Carbon block for hearth of blast furnace bottom and manufacturing method thereof |
| CN114988889B (en) * | 2022-05-06 | 2023-06-06 | 武汉科技大学 | Environment-friendly binding agent-based ultramicropore carbon brick and preparation method thereof |
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| CN1296318C (en) * | 2004-04-15 | 2007-01-24 | 兰州海龙新材料科技股份有限公司 | Soper microporous carbon brick for furnace lining and its producing method |
| CN1301934C (en) * | 2004-11-01 | 2007-02-28 | 武汉科技大学 | Briquette for iron-smelting blast furnace lining and its preparation method |
| CN1328219C (en) * | 2006-01-06 | 2007-07-25 | 巩义市第五耐火材料总厂 | Highly heat-conductive porous die stamping charcoal brick and its production method |
| CN101503302B (en) * | 2009-03-06 | 2012-03-21 | 武汉科技大学 | Carboneous fire-resistant material for furnace brick lining and preparation thereof |
| CN101602603B (en) * | 2009-07-09 | 2012-01-18 | 武汉钢铁(集团)公司 | Molten iron erosion-resisting blast furnace carbon brick and preparation method thereof |
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