CN103524137A - Magnesium carbon brick for steel-making converter and steel ladle, and preparation method of magnesium carbon brick - Google Patents
Magnesium carbon brick for steel-making converter and steel ladle, and preparation method of magnesium carbon brick Download PDFInfo
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- CN103524137A CN103524137A CN201310454103.0A CN201310454103A CN103524137A CN 103524137 A CN103524137 A CN 103524137A CN 201310454103 A CN201310454103 A CN 201310454103A CN 103524137 A CN103524137 A CN 103524137A
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- carbon brick
- steel
- magnesite clinker
- electrosmelted magnesite
- magnesia
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Abstract
The invention discloses a magnesium carbon brick for a steel-making converter and a steel ladle, and a preparation method of the magnesium carbon brick. The magnesium carbon brick is prepared from the following raw materials in percentage by weight: 75 to 85 percent of fused magnesia, 3 to 14 percent of granulated graphite, 1 to 5 percent of antioxidant and 2 to 5 percent of binding agent. The preparation method comprises the following steps: (1) mechanically crushing block-shaped magnesia, feeding the magnesia into a ball mill and performing fine grinding to prepare magnesia of five specifications; (2) preparing materials according to the required weight percentage, feeding the prepared materials into a mixing machine and mixing, wherein the coarse-granule magnesia, the thermosetting phenol resin binding agent, the granulated graphite and mixed powder of the fine-granule magnesia and the antioxidant are added sequentially, and the total mixing time is not less than 25 minutes; and finally processing and forming. Flake graphite is replaced by the granulated graphite, so that the finished product ratio of the materials is increased, and thermal spalling resistance and structure spalling resistance are improved.
Description
Technical field
The present invention relates to technical field of refractory materials, particularly magnesia carbon brick and preparation method thereof for a kind of steelmaking system.
Background technology
So far, magnesia carbon brick (MgO-C) is the main inner lining material of steel-making converter, ladle.From the Investigation on damage with rear converter, ladle, the damage of magnesia carbon brick mainly: on the one hand, the oxidation-resistance of carbon is poor, oxidizable, brings brick body slag corrosion resistance, antistripping variation thereupon; On the other hand, the carbon that magnesia carbon brick adopts is mainly crystalline flake graphite, and because its unique laminated structure can be when brick be body formed, parallel pressure forming direction produces elastic effect, the stress concentration that causes brick laying structure to occur slabbing and heat transfer anisotropy and cause, accelerates brick laying structure and destroys.
Summary of the invention
The present invention has overcome above-mentioned the deficiencies in the prior art, and the magnesia carbon brick that a kind of anti-oxidant, slag corrosion resistance and Spalling resistance can be strong is provided, thereby has effectively improved converter and ladle work-ing life, is conducive to smelter cost efficiency.
Technical scheme of the present invention is achieved in that
, a ladle magnesia carbon brick, formulated by following raw materials by weight: electrosmelted magnesite clinker 75 ~ 85%, granular graphite 3 ~ 14%, antioxidant 1 ~ 5%, bonding agent 2 ~ 5%.
As preferably, described electrosmelted magnesite clinker size composition is: the electrosmelted magnesite clinker 8～15% of 6 ~ 3mm, the electrosmelted magnesite clinker 8～15% of 3 ~ 1mm, the electrosmelted magnesite clinker 8～15% of 1 ~ 0.5mm, the electrosmelted magnesite clinker 6～24% of the electrosmelted magnesite clinker 14～31% of 0.5 ~ 0.088mm, < 0.088mm, wherein, in magnesia, MgO weight percent is more than or equal to 96%.
As preferably, in described granular graphite, the weight percent of C is more than or equal to 98%, and described granular graphite is synthetic graphite, barren rock electrode ink or useless graphite carbon sleeve roller.
As preferably, described granular graphite processes like this: be first broken into the particle of 1～0.045mm, then these particles form through aluminium colloidal sol or zirconium sol impregnation post-drying.
As preferably, described antioxidant is aluminium powder, silica flour or carborundum powder, and its granularity is 0.075～0.045mm.
As preferably, described bonding agent is heat-reactive phenolic resin.
A kind of steel-making converter, the ladle preparation method of magnesia carbon brick, comprise the following steps: (1), block electrosmelted magnesite clinker is carried out to Mechanical Crushing through jaw crusher, oppositely rolling roller crusher, cone crusher, send into again ball mill and carry out fine grinding, after screen cloth screening, making granularity is the electrosmelted magnesite clinker of 6 ~ 3mm, 3 ~ 1mm, 1 ~ 0.5mm, 0.5 ~ 0.088mm, five kinds of specifications of < 0.088mm; (2), weight percent is on request prepared burden, through the material preparing, send in mixer and mix, its order of addition(of ingredients) is for first adding the electrosmelted magnesite clinker of 6 ~ 3mm, 3 ~ 1mm, 1 ~ 0.5mm, then add heat-reactive phenolic resin bonding agent, add granular graphite again, finally add 0.5 ~ 0.088mm, the electrosmelted magnesite clinker of < 0.088mm and the powder mix of antioxidant, the total time of batch mixing is no less than 25 minutes; (3), the material mixing is added in mould, carry out extrusion forming; (4), the blank of moulding is sent in drying room, toasted; (5), after work in-process kiln discharge, test and pack.
Adopted the invention has the beneficial effects as follows of technique scheme:
A kind of steel-making converter the present invention relates to, ladle magnesia brick, by adopting granular graphite to substitute crystalline flake graphite, the problem that the stress concentration causing because of heat transfer anisotropy when slabbing, use appear in brick laying structure while efficiently solving moulding causes brick laying structure to destroy, yield rate and the heat resistanceheat resistant that has improved material peeled off, structure spalling performance; Simultaneously, containing the magnesia carbon brick of graphite after sol impregnation, because of colloidal sol infiltration and carbon coated particle, can greatly improve the antioxidant property of carbon, the colloidal sol simultaneously adopting is high-melting-point, high erosion-resistant ceramic phase in oven dry afterwards, can further improve the anti-scour property of material.
The present invention is through scientific and reasonable batching and thermal treatment process, anti-oxidant, the slag corrosion resistance of magnesia carbon brick of preparation and heat resistanceheat resistant is peeled off, structure spalling excellent property, high life, can be applicable to steel-making converter, ladle, particularly in oxidizable, easy scouring such as ladle slag lines and to peel off position effect very obvious.
Embodiment
The specific embodiment of the present invention is as follows:
Embodiment: the component of different material is carried out to the Different Weight per-cent proportioning as following table:
Its performance gives to embody as following table:
scouring index:
Magnesia carbon brick is made to 40 * 40 * 160 bar-shaped sample, adopt revolution anti-slag method by sample in 1650 ℃ of rotary kilns and be incubated 2 hours.Lateral dissection sample section, the scouring index of test samples.Each formula needs 3 samples, and averages.
heat-shock resistance:
High Temperature Furnaces Heating Apparatus is preheated to 1100 ± 10 ℃ and be incubated after 15min, rapidly sample is moved in burner hearth, after insulation 20min, rapidly sample is immersed in 5～35 ℃ of flowing waters, sharply after cooling 3min, take out immediately, in air, be no less than 5min storage period.Then sample is put into stove again, repeat said process, until large crackle appears in sample, till can not continuing experiment, record experiment number.Each formula needs 3 samples, and averages.
oxidated layer thickness:
Magnesia carbon brick sample is put into High Temperature Furnaces Heating Apparatus, under air atmosphere, be heated to 1400 ℃ and be incubated 3 hours, after naturally cooling, lateral dissection sample section, the oxidated layer thickness of test samples.Each formula needs 3 samples, and averages.
anisotropic heat conductivity:
First adopt laser heat conducting instrument to measure 2 direction thermal conductivitys of magnesia carbon brick sample, perpendicular to forming direction (K
⊥) and be parallel to forming direction (K
∥); Anisotropic heat conductivity=K
⊥/ K
∥.
Claims (7)
1. steel-making converter, a ladle magnesia carbon brick, is characterized in that by following raw materials by weight formulated: electrosmelted magnesite clinker 75 ~ 85%, granular graphite 3 ~ 14%, antioxidant 1 ~ 5%, bonding agent 2 ~ 5%.
2. a kind of steel-making converter according to claim 1, ladle magnesia carbon brick, it is characterized in that: described electrosmelted magnesite clinker size composition is: the electrosmelted magnesite clinker 8～15% of 6 ~ 3mm, the electrosmelted magnesite clinker 8～15% of 3 ~ 1mm, the electrosmelted magnesite clinker 8～15% of 1 ~ 0.5mm, the electrosmelted magnesite clinker 6～24% of the electrosmelted magnesite clinker 14～31% of 0.5 ~ 0.088mm, < 0.088mm, wherein, in magnesia, MgO weight percent is more than or equal to 96%.
3. a kind of steel-making converter according to claim 1, ladle magnesia carbon brick, is characterized in that: in described granular graphite, the weight percent of C is more than or equal to 98%, and described granular graphite is synthetic graphite, barren rock electrode ink or useless graphite carbon sleeve roller.
4. a kind of steel-making converter according to claim 3, ladle magnesia carbon brick, it is characterized in that: described granular graphite processes like this: be first broken into the particle of 1～0.045mm, then these particles form through aluminium colloidal sol or zirconium sol impregnation post-drying.
5. a kind of steel-making converter according to claim 1, ladle magnesia carbon brick, is characterized in that: described antioxidant is aluminium powder, silica flour or carborundum powder, and its granularity is 0.075～0.045mm.
6. a kind of steel-making converter according to claim 1, ladle magnesia carbon brick, is characterized in that: described bonding agent is heat-reactive phenolic resin.
7. the preparation method of magnesia carbon brick for a steel-making converter, ladle, it is characterized in that comprising the following steps: (1), block electrosmelted magnesite clinker is carried out to Mechanical Crushing through jaw crusher, oppositely rolling roller crusher, cone crusher, send into again ball mill and carry out fine grinding, after screen cloth screening, making granularity is the electrosmelted magnesite clinker of 6 ~ 3mm, 3 ~ 1mm, 1 ~ 0.5mm, 0.5 ~ 0.088mm, five kinds of specifications of < 0.088mm; (2), weight percent is on request prepared burden, through the material preparing, send in mixer and mix, its order of addition(of ingredients) is for first adding the electrosmelted magnesite clinker of 6 ~ 3mm, 3 ~ 1mm, 1 ~ 0.5mm, then add heat-reactive phenolic resin bonding agent, add granular graphite again, finally add 0.5 ~ 0.088mm, the electrosmelted magnesite clinker of < 0.088mm and the powder mix of antioxidant, the total time of batch mixing is no less than 25 minutes; (3), the material mixing is added in mould, carry out extrusion forming; (4), the blank of moulding is sent in drying room, toasted; (5), after work in-process kiln discharge, test and pack.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310454103.0A CN103524137A (en) | 2013-09-29 | 2013-09-29 | Magnesium carbon brick for steel-making converter and steel ladle, and preparation method of magnesium carbon brick |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310454103.0A CN103524137A (en) | 2013-09-29 | 2013-09-29 | Magnesium carbon brick for steel-making converter and steel ladle, and preparation method of magnesium carbon brick |
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| CN103524137A true CN103524137A (en) | 2014-01-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104311082A (en) * | 2014-10-21 | 2015-01-28 | 安徽省萧县华龙耐火材料有限责任公司 | Magnesia-carbon ladle slag line brick and production method thereof |
| CN104496492A (en) * | 2014-10-10 | 2015-04-08 | 长兴正发热电耐火材料有限公司 | Composite magnesium-carbon fireproof crucible and preparation method thereof |
| CN107140950A (en) * | 2017-04-05 | 2017-09-08 | 中国地质大学（北京） | A kind of preparation method of sucrose combination MgO C fire resistant materials |
| CN107244925A (en) * | 2017-04-05 | 2017-10-13 | 中国地质大学（北京） | A kind of preparation method of glucose combination magnesia carbon brick |
| CN109279874A (en) * | 2018-09-28 | 2019-01-29 | 湖州盛特隆金属制品有限公司 | A kind of refining ladle of low erosion |
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| CN101186515A (en) * | 2007-12-21 | 2008-05-28 | 杨红 | Ultra-low-carbon steel slag inclusion line magnesium-carbon brick and producing method thereof |
| CN101407426A (en) * | 2008-11-11 | 2009-04-15 | 河南省西保冶材集团有限公司 | Material preparing technology of slag line brick for ladle |
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| CN101186515A (en) * | 2007-12-21 | 2008-05-28 | 杨红 | Ultra-low-carbon steel slag inclusion line magnesium-carbon brick and producing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496492A (en) * | 2014-10-10 | 2015-04-08 | 长兴正发热电耐火材料有限公司 | Composite magnesium-carbon fireproof crucible and preparation method thereof |
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| CN104311082B (en) * | 2014-10-21 | 2016-05-04 | 安徽省萧县华龙耐火材料有限责任公司 | A kind of magnesium carbon ladle slag line brick and production method thereof |
| CN107140950A (en) * | 2017-04-05 | 2017-09-08 | 中国地质大学（北京） | A kind of preparation method of sucrose combination MgO C fire resistant materials |
| CN107244925A (en) * | 2017-04-05 | 2017-10-13 | 中国地质大学（北京） | A kind of preparation method of glucose combination magnesia carbon brick |
| CN109279874A (en) * | 2018-09-28 | 2019-01-29 | 湖州盛特隆金属制品有限公司 | A kind of refining ladle of low erosion |
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Application publication date: 20140122 |