CN102040391B - Boron iron powder-containing magnesia carbon product - Google Patents
Boron iron powder-containing magnesia carbon product Download PDFInfo
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- CN102040391B CN102040391B CN 201010549264 CN201010549264A CN102040391B CN 102040391 B CN102040391 B CN 102040391B CN 201010549264 CN201010549264 CN 201010549264 CN 201010549264 A CN201010549264 A CN 201010549264A CN 102040391 B CN102040391 B CN 102040391B
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Abstract
The invention relates to a boron iron powder-containing magnesia carbon product, which belongs to the technical field of refractory materials for metallurgy. According to the technical scheme provided by the invention, the magnesia carbon product comprises 0.2 to 6 percent of boron iron powder and the balance of magnesia and carbon element which serve as major components and are combined with each other by a carbon-containing binding agent. The boron iron powder can enhance the graphitization degree of the carbon binding structure of the magnesia carbon product, enhances oxidation resistance, lowers internal thermal stress, enhances volume stability and remarkably enhances impact resistance.
Description
Technical field
The present invention relates to a kind of magnesium carbonaceous article of boracic iron powder, belong to metallurgical use technical field of refractory materials, specifically a kind of magnesium carbonaceous article.
Background technology
Magnesia carbon brick is to be the refractory materials of staple with Natural manganese dioxide and carbon, contains Natural manganese dioxide 60% ~ 95%, carbon element 1% ~ 40%.Owing to combined magnesia and carbon element advantage separately; Magnesia carbon brick has good resistance to slag corrosion, slag penetration property and thermal conductivity; Mainly be used to furnace lining, the tap hole of steel-making converter; Superpower electric furnace liner, and position such as external refining inner lining of furnace, steel teeming ladle slag line are that present most important steel-making is with one of refractory materials.
Magnesia carbon brick is used for high-temperature work environment, and carbon element wherein at high temperature is oxidized to CO or CO easily
2The oxidation of carbon element is the topmost damage factor of magnesia carbon brick.For suppressing the oxidation of carbon in the magnesia carbon brick, generally all add the metal oxidation resistance agent.Commonly used have aluminium powder, an aluminium-magnesium alloy powder etc.Above-mentioned inhibitor is at the inner aluminium carbide that produces of magnesia carbon brick under the high temperature, and the heat-shock resistance of magnesia carbon brick is had disadvantageous effect.
Summary of the invention
The object of the present invention is to provide a kind of magnesium carbonaceous article, its oxidation-resistance, heat-shock resistance and shock resistance are improved synchronously.
According to technical scheme provided by the invention, the magnesium carbonaceous article of said boracic iron powder is following by weight percentage:
Magnesia 65% ~ 94.5%;
Carbon element 1% ~ 25%;
Ferro-boron powder 0.2% ~ 6%;
Liquid phenolic resin 2.5% ~ 4%.
By said proportioning magnesia powder and ferro-boron powder are packed into together and to mix in the mixing machine, obtain the pre-mixing fine powder; Magnesia particle is added in the wheel roller, add liquid phenolic resin and mix; Add carbon element again, continue to mix; Add the pre-mixing fine powder at last, obtain the magnesium carbonaceous article crude green body compound of boracic iron powder; With putting into stock mould after the compound weighing, obtain the product adobe with press-molding, adobe baking back kiln discharge packing, obtain the magnesium carbonaceous article of boracic iron powder.
Said magnesia is magnesia particle and magnesia powder.Said ferro-boron powder is the alloy of ferro element and boron, and wherein boron content is 10% ~ 30%, and all the other are ferro element and unavoidable impurities.Said ferro-boron powder order number is less than 80 orders.Said carbon element is the mixture of one or both materials in graphite, the carbon black.
Beneficial effect of the present invention: adopt the magnesium carbonaceous article of the boracic iron powder of the present invention's technology preparation, oxidation-resistance, heat-shock resistance and shock resistance all can be improved synchronously.
Embodiment
Technical scheme of the present invention: a kind of magnesium carbonaceous article of boracic iron powder, said magnesium carbonaceous article is following by weight percentage:
Magnesia 65% ~ 94.5%; Carbon element 1% ~ 25%; Ferro-boron powder 0.2% ~ 6%; Liquid phenolic resin 2.5% ~ 4%;
The magnesium carbonaceous article preparation process of said boracic iron powder is following:
(1) batch mixing: by said proportioning magnesia powder and ferro-boron powder are packed into together and to mix 10 ~ 20 minutes in the mixing machine, obtain the pre-mixing fine powder; Magnesia particle is added in the wheel roller, add liquid phenolic resin, mixed 4 ~ 6 minutes; Add carbon element, continue to mix 4 ~ 6 minutes; Add the pre-mixing fine powder again, mix the magnesium carbonaceous article crude green body compound that obtains the boracic iron powder after 10 ~ 20 minutes;
(2) moulding: with the weighing of step (1) gained compound, in the moulding of 1000 tons of friction press stock moulds, 180 ~ 200 ℃ of temperature were toasted 15 ~ 20 hours; Obtain the product adobe;
(3), promptly get the magnesium carbonaceous article of boracic iron powder with the product kiln discharge packing of step (2) gained.
Said magnesia is magnesia particle and magnesia powder, and the magnesia particle granularity is smaller or equal to 10mm, and magnesia powder order number is less than 180 orders.
Said ferro-boron powder is the alloy of ferro element and boron, and wherein boron content is 10% ~ 30%, and all the other are mainly ferro element, and granularity is less than 80 orders.Said carbon element is the mixture of one or both materials in graphite, the carbon black.Contain ferro-boron powder 0.2% ~ 6% in the said magnesium carbonaceous article.All the other staples are magnesia and carbon element, and use contains the combination of resol liquid wedding agent.
Contain 10% ~ 30% boron in the ferro-boron powder, all the other mainly are ferro elements.According to the ferro-boron binary phase diagram, ferro-boron has a low eutectic point (1149 ℃) when boracic 17%, and promptly fusing point both had been lower than pure iron and also has been lower than pure boron at this moment.Because also contain impurity such as a spot of carbon, silicon in the ferro-boron, its actual fusing point also will more be lower than shown in the binary phase diagram.
Ferro-boron plays following effect in the magnesium carbonaceous article:
1. improve the thermal conductivity of magnesium carbonaceous article, reduce internal stress thereby reduce the material internal thermograde.
2. ferro-boron softens, liquefies and offset material heat expansion under the high temperature, reduces the coefficient of thermal expansion of goods, improves volume stability.
3. the reaction of metallic iron and carbon element generates alloy, under middle temperature, produces superplasticity, and certain creep properties is provided.
4. form B on the magnesia carbon brick surface after the ferro-boron oxidation
2O
3And generate low-melting MgOB with MgO reaction in the magnesia carbon brick
2O
3, form the liquid phase layer on the magnesia carbon brick surface, stop the infiltration of oxygen.
5. the metallic iron oxidation becomes red stone, and pore is stopped up in volumetric expansion, can play the effect of inhibitor.Red stone can generate dystectic solution that is total to continuously with Natural manganese dioxide, further plays the densification effect.
6. form network-like carbon structure in the magnesia carbon brick after the wedding agent carbonization.Metallic iron has the catalyzed graphitization effect to this carbon structure, can improve microtexture, density, intensity and the oxidation-resistance of this kind carbon structure.
7. along with the loss of magnesia carbon brick, boron and ferro element get into molten steel, do not produce pollution.
Experiment shows that the ferro-boron powder is suitable to the antioxidant effect and the aluminium powder of magnesia carbon brick.But compare with the magnesia carbon brick that adds aluminium powder, it does not in use produce aluminium carbide, can avoid the aquation crackle.
Content among the following embodiment is weight percentage.
Embodiment 1
(1) batch mixing: with 25% granularity is that the ferro-boron powder of 200 purpose electrosmelted magnesite clinkers and 0.2% (800 orders, contain B element 30%) is packed into together and mixed 10 minutes in the mixing machine, obtains the pre-mixing fine powder; With 66.8% granularity is in the electrosmelted magnesite clinker adding wheel roller of 0 ~ 6mm, adds heat-reactive phenolic resin liquid 3% again, mixes 5 minutes;-198 graphite, the 0.5%N220 carbon black of adding 4.5% continue to mix 5 minutes; In wheel roller, add the pre-mixing fine powder, mix obtaining compound after 20 minutes;
(2) moulding: with the weighing of step (1) gained compound,, obtain adobe, put into the tunnel baking to adobe, 200 ℃ of top temperatures, total storing time 20 hours with the moulding of 1000 tons of friction press stock moulds;
(3), promptly get the magnesium carbonaceous article of boracic iron powder with the product kiln discharge packing of step (2) gained.
The volume stability of this product is good, and erosion resistance is strong, is applicable to positions such as ladle slag line.
Embodiment 2
(1) batch mixing: be to mix 10 minutes in ferro-boron powder (800 orders, the contain B element 20%) mixing machine of packing into together of 200 purpose electrosmelted magnesite clinkers and 2% 24% order number, obtain the pre-mixing fine powder; The electrosmelted magnesite clinker of 70.5% 0 ~ 5mm is added in the wheel roller, add 2.5% heat-reactive phenolic resin liquid again, mixed 5 minutes; Add the 1%N220 carbon black, continue to mix 5 minutes; In wheel roller, add the pre-mixing fine powder, mix obtaining compound after 20 minutes.
(2) moulding: with the weighing of step (1) gained compound, obtain adobe, put into the tunnel baking to adobe, 170 ℃ of top temperatures, total storing time 20 hours with the moulding of 630 tons of friction press stock moulds;
(3), promptly get the magnesium carbonaceous article of boracic iron powder with the product kiln discharge packing of step (2) gained.
This product has excellent oxidation-resistance and shock resistance, even a small amount of decarburization still keeps good high-temperature performance and intensity, is applicable to positions such as ladle bag mouth, electric furnace stove gate.
Embodiment 3
(1) batch mixing: be to mix 10 minutes in ferro-boron powder (80 orders, the contain B element 10%) mixing machine of packing into together of 200 purpose electrosmelted magnesite clinkers and 6% 10% granularity, obtain the pre-mixing fine powder; With granularity is in the electrosmelted magnesite clinker adding wheel roller of 0 ~ 10mm, weight fraction 55%, adds 4% heat-reactive phenolic resin liquid again, mixes 5 minutes;-197 graphite of adding 25% mixed 15 minutes; Add the pre-mixing fine powder again, mix obtaining compound after 20 minutes;
(2) moulding: with the weighing of step (1) gained compound, obtain adobe, put into the tunnel baking to adobe, 240 ℃ of top temperatures, total storing time 14 hours with the moulding of 1600 tons of friction press stock moulds;
(3), promptly get the magnesium carbonaceous article of boracic iron powder with the product kiln discharge packing of step (2) gained.
This product is used for the refining furnace slag line.
Claims (4)
1. the magnesium carbonaceous article of a boracic iron powder, said magnesium carbonaceous article is following by weight percentage:
Magnesia 65% ~ 94.5%;
Carbon element 1% ~ 25%;
Ferro-boron powder 0.2% ~ 6%;
Liquid phenolic resin 2.5% ~ 4%;
Said magnesia is magnesia particle and magnesia powder;
It is characterized in that, by proportioning magnesia powder and ferro-boron powder are packed into together and mix in the mixing machine, obtain the pre-mixing fine powder; Magnesia particle is added in the wheel roller, add liquid phenolic resin and mix; Add carbon element again, continue to mix; Add the pre-mixing fine powder at last, obtain the magnesium carbonaceous article crude green body compound of boracic iron powder; With putting into stock mould after the compound weighing, obtain the product adobe with press-molding, adobe baking back kiln discharge packing, obtain the magnesium carbonaceous article of boracic iron powder.
2. according to the magnesium carbonaceous article of the said boracic iron powder of claim 1, it is characterized in that said ferro-boron powder is the alloy of ferro element and boron, wherein boron content is 10% ~ 30%, and all the other are ferro element and unavoidable impurities.
3. according to the magnesium carbonaceous article of the said boracic iron powder of claim 1, it is characterized in that said ferro-boron powder order number is less than 80 orders.
4. according to the magnesium carbonaceous article of the said boracic iron powder of claim 1, it is characterized in that said carbon element is the mixture of one or both materials in graphite, the carbon black.
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| CN 201010549264 CN102040391B (en) | 2010-11-18 | 2010-11-18 | Boron iron powder-containing magnesia carbon product |
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| CN 201010549264 CN102040391B (en) | 2010-11-18 | 2010-11-18 | Boron iron powder-containing magnesia carbon product |
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| CN102040391A CN102040391A (en) | 2011-05-04 |
| CN102040391B true CN102040391B (en) | 2012-12-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102276271A (en) * | 2011-06-29 | 2011-12-14 | 江苏苏嘉集团新材料有限公司 | Preparation method of normal temperature solidified magnesium carbon brick |
| CN102329136B (en) * | 2011-06-29 | 2013-11-06 | 江苏苏嘉集团新材料有限公司 | Method for preparing magnesia carbon brick |
| CN102320849B (en) * | 2011-08-24 | 2013-01-23 | 江苏苏嘉集团新材料有限公司 | Inorganically bonded magnesia-carbon brick |
| CN103387396B (en) * | 2013-07-22 | 2015-08-12 | 东北大学 | A kind of converter extracting vanadium magnesium iron carbon brick and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215177A (en) * | 2007-12-29 | 2008-07-09 | 中国钢研科技集团公司 | Low-carbon magnesium oxide base composite fireproof material and preparation method thereof |
| CN101423417A (en) * | 2008-10-31 | 2009-05-06 | 江苏苏嘉集团新材料有限公司 | Low carbon magnesia-carbon brick containing metal iron |
| CN101423925A (en) * | 2008-11-28 | 2009-05-06 | 锦州北方耐火模具有限公司 | Carbon and boron complex seeping treatment process of Mg-Cr refractory product mould |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008151425A (en) * | 2006-12-18 | 2008-07-03 | Kurosaki Harima Corp | Repair method of magnesia carbon brick |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215177A (en) * | 2007-12-29 | 2008-07-09 | 中国钢研科技集团公司 | Low-carbon magnesium oxide base composite fireproof material and preparation method thereof |
| CN101423417A (en) * | 2008-10-31 | 2009-05-06 | 江苏苏嘉集团新材料有限公司 | Low carbon magnesia-carbon brick containing metal iron |
| CN101423925A (en) * | 2008-11-28 | 2009-05-06 | 锦州北方耐火模具有限公司 | Carbon and boron complex seeping treatment process of Mg-Cr refractory product mould |
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| JP特开2008-151425A 2008.07.03 |
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