CN101391897A - Air brick for magnesia carbon ladle and method for producing the same - Google Patents
Air brick for magnesia carbon ladle and method for producing the same Download PDFInfo
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- CN101391897A CN101391897A CNA2007100129065A CN200710012906A CN101391897A CN 101391897 A CN101391897 A CN 101391897A CN A2007100129065 A CNA2007100129065 A CN A2007100129065A CN 200710012906 A CN200710012906 A CN 200710012906A CN 101391897 A CN101391897 A CN 101391897A
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Abstract
The invention discloses an air brick used for a magnesium and carbon ladle, and a producing method thereof, aiming at producing high-quality air bricks used for the ladles. The mass percentage of the chemical compositions of the air brick is: 55 to 99 percent of MgO, 0 to 20 percent of C, 0 to 20 percent of AI2O3, 0 to 5 percent of ZrO2, 0 to 5 percent of AI, 0 to 5 percent of AI-Mg alloy, 0 to 5 percent of CaB6, and 0 to 2 percent of B4; the physical property indexes are: volume density (g/cm<3>): 3.00 to 3.15, apparent porosity (%): 1.5 to 5.0, cold compressive strength (MPa): 40 to 65, and distortion resistance at high temperature (MPa): 14.0 to 25.0. Raw materials adopted by the invention comprise fused magnesite, magnesite clinker, crystalline flake graphite, corundum, zirconia and oxidation inhibitor. The raw materials are added into a pug mill and externally added with a bonding agent for mulling. Mulled pug is added into a mould, and molded by utilizing isopressing equipment or a friction brick press or a hydraulic press. The invention obviously reduces the apparent porosity of the air brick, not only can improve the basic slag corrosion resistant capability of the air brick, but also can reduce the cost of the raw materials by more than two thirds.
Description
Technical field
The present invention relates to the ferrous metallurgy carbon containing refractory, especially a kind of air brick for magnesia carbon ladle and production method thereof.
Background technology
Gas permeable brick is widely used a kind of functional refractory in the ferrous metallurgy industry, mainly be installed on metallurgical industry equipment such as converter, electric furnace or ladle, its major function can increase substantially smelting efficient for gases such as argon gas, nitrogen, helium are blown into the stirring molten steel by gas permeable brick.At present, ladle is chromium-corundum-mullite matter that corundum matter, chrome corundum, corundum-spinel matter, high temperature are burnt till with the main material of gas permeable brick, and the patent No. is the gas permeable brick that the disclosed content of the patent documentation of ZL94118264.9 has been represented this class material; Beta-Sialon is in conjunction with SiC matter, the patent documentation introduction of patent No. ZL 02137247.0; Aluminate carbonaceous, the patent No. are the patent documentation introduction of ZL200310115042.1; Aluminium and/or zirconium carbonaceous, the patent No. are that 200310115041.7 patent documentation also has introduction.Because above material is amphoteric refractory, easily and CaO, SiO in the basic slag
2, Fe
2O
3Deng the generation chemical reaction, generate low melting component, therefore the ability of alkali-resistivity slag corrosion is all poor than basic refractory, and all there is poor, the anti-molten steel of resistance to fouling in the gas permeable brick of above material and slag penetration is poor, easy dry slag, work-ing life are low, the workman must repeatedly change shortcomings such as gas permeable brick.
Above-mentioned material ladle all adopts vibrating casting moulding or pressure forming with gas permeable brick, there is the high problem of apparent porosity, the apparent porosity of the corundum matter gas permeable brick of vibrating casting moulding is 20%, and the beta-Sialon of pressure forming is 14% in conjunction with the apparent porosity of SiC matter gas permeable brick.Problem such as simultaneously also have poor, the anti-molten steel of resistance to fouling and slag penetration is poor, air flue stops up easily, easily dry slag, work-ing life be low.
Summary of the invention
The invention provides air brick for magnesia carbon ladle and production method thereof, produce that a kind of density is big, apparent porosity is low, anti-molten steel and slag penetration is good, good permeability, be difficult for the ladle gas permeable brick of dry slag, high life.
Air brick for magnesia carbon ladle chemical constitution mass percent provided by the present invention is: MgO 55～99%, and C 0～20%, Al
2O
30～20%, ZrO
20～5%, Al 0～5%, Al-Mg alloy 0～5%, CaB
60～5%, B
4C 0～2%;
Air brick for magnesia carbon ladle physical performance index provided by the present invention is: volume density g/cm
3: 3.00～3.15, apparent porosity %:1.5～5.0, cold crushing strength MPa (110 ℃ * 24h): 40～65, high temperature break resistant intensity MPa (1400 ℃ * 0.5h): 14.0～25.0.
The production method of air brick for magnesia carbon ladle provided by the invention is as follows:
1. raw material
The raw material that adopts comprises electrosmelted magnesite clinker, magnesite clinker, crystalline flake graphite, corundum, zirconium white, wedding agent and oxidation inhibitor, and wherein various raw material add-ons are as follows:
Electrosmelted magnesite clinker or magnesite clinker 58～99%
Corundum 0～20%
Crystalline flake graphite 0～21%
Zirconium white 0～6%
Wedding agent 2～5%
Oxidation inhibitor 0.5～5%
Wherein said electrosmelted magnesite clinker, magnesite clinker are MgO 〉=95%, and granularity＜5mm belongs to alkaline refractory raw material, with the difficult chemical reaction that takes place of the basic slag in the ladle, can improve the ability of alkali-resistivity slag corrosion;
Wherein said crystalline flake graphite is C 〉=95%, and the carbon materials of granularity＜0.15mm is difficult for wetting by molten steel or slag;
Wherein said corundum is Al
2O
3〉=99% sintering plate corundum or fused white corundum or Al
2O
3〉=98% fine and close fused corundom or sub-white corundum or Al
2O
3〉=94.5% fused brown corundum, granularity＜5mm, in the temperature elevation process can with magnesia reaction generate dystectic in conjunction with magnesium-aluminium spinel mutually, thereby improve the hot strength of goods;
Wherein said zirconium white is ZrO
2〉=92% PSZ or ZrO
2〉=90% desilicated zirconia, granularity＜3mm is used to improve the thermal shock resistance of goods;
Wherein said wedding agent is to be liquid heat-reactive phenolic resin under the normal temperature, and remaining carbon 〉=45%, or solid resin powder add ethylene glycol according to solid resin powder: ethylene glycol=1:2～4 ratios during use;
Wherein said oxidation inhibitor comprises metal A l powder, Al-Mg alloy powder, CaB
6Powder, B
4Wherein one or more of C powder;
2. production technique
With electrosmelted magnesite clinker, magnesite clinker, crystalline flake graphite, corundum, zirconium white and oxidation inhibitor join in the mud stone roller machine, add 2%～5% wedding agent, mix 30～40 minutes, and mixing to whole materials evenly is pug after calendering; Plastic strip, nylon strip, tinsel or metal tube are installed in the mould according to the pore arrangement form; Pug after calendering is joined in the mould, utilize equal pressing equipment or friction press or hydropress at 100～300MPa compacted under; Through 100 ℃～200 ℃ thermal treatments 12～48 hours; Utilize lathe that base substrate is carried out turning by the figure paper size, after the turning drying, according to the packaging technology assembling of gas permeable brick.
Gordian technique of the present invention is to utilize carbonaceous material to be difficult for the advantage that is difficult for the generation chemical reaction as the basic slag in alkaline refractory raw material and the ladle by the wetting characteristic of molten steel and slag and magnesia, select for use magnesium carbon material as the main material of ladle with gas permeable brick, utilize equal pressing equipment or friction press or hydropress moulding, big pressure when particularly utilizing the equal pressing equipment moulding and pressure homogeneity, preparation density is big, the goods that apparent porosity is low, solving the molten steel infiltration causes gas passage to stop up, molten steel or slag and gas permeable brick reaction make the life-span short, the workman must repeatedly change problems such as gas permeable brick, reduces labor strength, guarantee ladle turnover and saving steel-making refractory materials cost continuously.
The present invention compared with prior art, its significant beneficial effect is: by utilizing equal pressing equipment or friction press or hydropress moulding, significantly reduce the apparent porosity of the gas permeable brick that uses at present.Wetting by adopting carbonaceous material that it is difficult for by molten steel and slag, strengthened anti-molten steel or slag penetration performance, guarantee that gas passage is unimpeded, avoid or reduced because airway obstruction and " burning oxygen " operation that must adopt.By selecting this alkaline refractory raw material of magnesia for use, not only can improve the ability of gas permeable brick alkali-resistivity slag corrosion, and can reduce and produce with raw materials cost more than 2/3rds.
Corundum-spinel and chrome corundum gas permeable brick physical performance index are: volume density g/cm
3: 3.10～3.35, apparent porosity %:10.0～18.0, cold crushing strength MPa (1500 ℃ * 3h): 60～140, high temperature break resistant intensity MPa (1400 ℃ * 0.5h): 10.0～22.0, product of the present invention by comparison, the most obvious part is that apparent porosity has reduced by 50%～90%, thereby has significantly reduced the passage of molten steel and slag infiltration, has improved permeability resistance.
By the ladle gas permeable brick that above technical measures are produced, production cost descends, and reduces significantly and changes frequency, has reduced labor strength, has guaranteed that ladle has enough to meet the need continuously, has improved work-ing life, has saved steel-making refractory materials cost.
Embodiment
Describe content of the present invention in detail with specific embodiment below:
Embodiment 1
The air brick for magnesia carbon ladle chemical constitution mass percent that the present invention produced is: MgO 75～79%, C13～15%, Al
2O
33～6%;
The air brick for magnesia carbon ladle physical performance index that the present invention produced is: volume density g/cm
3: 3.00～3.04, apparent porosity %:1.5～3.0, cold crushing strength MPa (110 ℃ * 24h): 40～55, high temperature break resistant intensity MPa (1400 ℃ * 0.5h): 14.0～18.0.
The production method of air brick for magnesia carbon ladle of the present invention is as follows:
78～83% electrosmelted magnesite clinkers, 12～14% crystalline flake graphites, 2～3% oxidation inhibitor metal A l powder are mixed, and the heat-reactive phenolic resin that adds 3～5% liquid state mixed 30～40 minutes as wedding agent, evenly was pug to whole materials; Plastic strip is installed in the mould according to the pore arrangement form; Pug after calendering is joined in the mould, utilize equal pressing equipment at the 200MPa compacted under; Through 200 ℃ of thermal treatments 24 hours; Utilize lathe that base substrate is carried out turning by the figure paper size, after the turning drying, promptly make the gas permeable brick goods according to the assembling of the packaging technology of gas permeable brick.
Wherein said electrosmelted magnesite clinker is MgO 96～98%, granularity＜5mm;
Wherein said crystalline flake graphite is C 96～98%, granularity＜0.15mm;
Wherein said wedding agent is to be liquid heat-reactive phenolic resin, carbon residue rate 45～48% under the normal temperature.
Embodiment 2
The air brick for magnesia carbon ladle chemical constitution mass percent that the present invention produced is: MgO 65～69%, C13～15%, Al
2O
314～16%, Al wherein
2O
3Content is the resultant of plate diamond spar and metal A l;
The air brick for magnesia carbon ladle physical performance index that the present invention produced is: volume density g/cm
3: 3.04～3.10, apparent porosity %:1.5～3.0, cold crushing strength MPa (110 ℃ * 24h): 50～65, high temperature break resistant intensity MPa (1400 ℃ * 0.5h): 16.0～20.0.
The production method of air brick for magnesia carbon ladle of the present invention is as follows:
With 46～48% electrosmelted magnesite clinkers, 22～24% magnesite clinker, 12～14% crystalline flake graphites, 9～11% sintering plate corundum, 2～3% oxidation inhibitor Al-Mg alloy powder, 1.5～2.5% oxidation inhibitor CaB
6Powder mixes, the heat-reactive phenolic resin that adds 3～5% liquid state were mixed 30～40 minutes as wedding agent, and extremely all materials evenly are pug; Plastic strip is installed in the mould according to the pore arrangement form; Pug after calendering is joined in the mould, utilize equal pressing equipment at the 200MPa compacted under; Through 200 ℃ of thermal treatments 24 hours; Utilize lathe that base substrate is carried out turning by the figure paper size, after the turning drying, promptly make the gas permeable brick goods according to the assembling of the packaging technology of gas permeable brick.
Wherein said electrosmelted magnesite clinker and magnesite clinker are MgO 96～98%, granularity＜5mm;
Wherein said sintering plate corundum is Al
2O
399.5～99.8%, granularity＜2mm
Wherein said crystalline flake graphite is C 96～98%, granularity＜0.15mm;
Wherein said wedding agent is to be liquid heat-reactive phenolic resin, carbon residue rate 45～48% under the normal temperature.
Embodiment 3
The air brick for magnesia carbon ladle chemical constitution mass percent that the present invention produced is: MgO 70～74%, C13～15%, Al
2O
33～6%, ZrO
23～5%;
The air brick for magnesia carbon ladle physical performance index that the present invention produced is: volume density g/cm
3: 3.10～3.15, apparent porosity %:1.5～3.0, cold crushing strength MPa (110 ℃ * 24h): 50～60, high temperature break resistant intensity MPa (1400 ℃ * 0.5h): 15.0～18.0.
The production method of air brick for magnesia carbon ladle of the present invention is as follows:
With 73～77% electrosmelted magnesite clinkers, 12～14% crystalline flake graphites, 3～5% PSZ, 1.5～3% oxidation inhibitor metal A l powder, 1.5～2.5% oxidation inhibitor CaB6 powder mixes, the heat-reactive phenolic resin that adds 3～5% liquid state is as wedding agent, mixed 30～40 minutes, extremely all materials evenly are pug; Plastic strip is installed in the mould according to the pore arrangement form; Pug after calendering is joined in the mould, utilize equal pressing equipment at the 200MPa compacted under; Through 200 ℃ of thermal treatments 24 hours; Utilize lathe that base substrate is carried out turning by the figure paper size, after the turning drying, promptly make the gas permeable brick goods according to the assembling of the packaging technology of gas permeable brick.
Wherein said electrosmelted magnesite clinker is MgO 96～98%, granularity＜5mm;
Wherein said PSZ is the stable ZrO of CaO
293～95%, granularity＜0.088mm
Wherein said crystalline flake graphite is C 96～98%, granularity＜0.15mm;
Wherein said wedding agent is to be liquid heat-reactive phenolic resin, carbon residue rate 45～48% under the normal temperature.
Embodiment 4
The air brick for magnesia carbon ladle chemical constitution mass percent that the present invention produced is: MgO 65～69%, C13～15%, Al
2O
38～12%, ZrO
23～5%;
The air brick for magnesia carbon ladle physical performance index that the present invention produced is: volume density g/cm
3: 3.06～3.12, apparent porosity %:1.5～3.0, cold crushing strength MPa (110 ℃ * 24h): 50～65, high temperature break resistant intensity MPa (1400 ℃ * 0.5h): 16.0～20.0.
The production method of air brick for magnesia carbon ladle of the present invention is as follows:
With 68～72% electrosmelted magnesite clinkers, 12～14% crystalline flake graphites, 5～8% sintering plate corundum, 3～5% PSZ, 2～3% oxidation inhibitor metal A l powder, 1～2% oxidation inhibitor CaB
6Powder, 0.5% oxidation inhibitor B
4The C powder mixes is even, and the heat-reactive phenolic resin that adds 3～5% liquid state mixed 30～40 minutes as wedding agent, and extremely all materials evenly are pug; Plastic strip is installed in the mould according to the pore arrangement form; Pug after calendering is joined in the mould, utilize equal pressing equipment at the 200MPa compacted under; Through 200 ℃ of thermal treatments 24 hours; Utilize lathe that base substrate is carried out turning by the figure paper size, after the turning drying, promptly make the gas permeable brick goods according to the assembling of the packaging technology of gas permeable brick.
Wherein said electrosmelted magnesite clinker is MgO 96～98%, granularity＜5mm;
Wherein said sintering plate corundum is Al
2O
399.5～99.8%, granularity＜2mm
Wherein said PSZ is the stable ZrO of CaO
293～95%, granularity＜0.088mm
Wherein said crystalline flake graphite is C 96～98%, granularity＜0.15mm;
Wherein said wedding agent is to be liquid heat-reactive phenolic resin, carbon residue rate 45～48% under the normal temperature.
Claims (3)
1. air brick for magnesia carbon ladle, it is characterized in that gas permeable brick chemical constitution mass percent is: MgO 55～99%, and C 0～20%, Al
2O
30～20%, ZrO
20～5%, Al 0～5%, Al-Mg alloy 0～5%, CaB
60～5%, B
4C 0～2%;
Above-mentioned air brick for magnesia carbon ladle physical performance index is: volume density g/cm
3: 3.00～3.15, apparent porosity %:1.5～5.0, cold crushing strength MPa (110 ℃ * 24h): 40～65, high temperature break resistant intensity MPa (1400 ℃ * 0.5h): 14.0～25.0.
2. the production method of the described air brick for magnesia carbon ladle of claim 1 is as follows:
A. raw material
The raw material that adopts comprises electrosmelted magnesite clinker, magnesite clinker, crystalline flake graphite, corundum, zirconium white, wedding agent and oxidation inhibitor, and wherein various raw material add-ons are as follows:
Electrosmelted magnesite clinker or magnesite clinker 58～99%
Corundum 0～20%
Crystalline flake graphite 0～21%
Zirconium white 0～6%
Wedding agent 2～5%
Oxidation inhibitor 0.5～5%
B. production technique
With electrosmelted magnesite clinker, magnesite clinker, crystalline flake graphite, corundum, zirconium white and oxidation inhibitor join in the mud stone roller machine, add 2%～5% wedding agent, mix 30～40 minutes, and mixing to whole materials evenly is pug after calendering; Plastic strip, nylon strip, tinsel or metal tube are installed in the mould according to the pore arrangement form; Pug after calendering is joined in the mould, utilize equal pressing equipment or friction press or hydropress at 100～300MPa compacted under; Through 100 ℃～200 ℃ thermal treatments 12～48 hours; Utilize lathe that base substrate is carried out turning by the figure paper size, after the turning drying, according to the packaging technology assembling of gas permeable brick.
3. the production method of the described air brick for magnesia carbon ladle of claim 2, electrosmelted magnesite clinker described in the raw material or magnesite clinker MgO 〉=95%, granularity＜5mm; Crystalline flake graphite C 〉=95%, the carbon materials of granularity＜0.15mm; Corundum is Al
2O
3〉=99% sintering plate corundum or fused white corundum or Al
2O
3〉=98% fine and close fused corundom or sub-white corundum or Al
2O
3〉=94.5% fused brown corundum, granularity＜5mm; Zirconium white is ZrO
2〉=92% PSZ or ZrO
2〉=90% desilicated zirconia, granularity＜3mm; Wedding agent is to be liquid heat-reactive phenolic resin under the normal temperature, and remaining carbon 〉=45%, or solid resin powder add ethylene glycol according to solid resin powder: ethylene glycol=1:2～4 ratios during use; Oxidation inhibitor comprises metal A l powder, Al-Mg alloy powder, CaB
6Powder, B
4Wherein one or more of C powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100129065A CN101391897A (en) | 2007-09-20 | 2007-09-20 | Air brick for magnesia carbon ladle and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100129065A CN101391897A (en) | 2007-09-20 | 2007-09-20 | Air brick for magnesia carbon ladle and method for producing the same |
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|---|---|
| CN101391897A true CN101391897A (en) | 2009-03-25 |
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ID=40492437
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|---|---|---|---|
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| CN101811881A (en) * | 2010-04-20 | 2010-08-25 | 重庆钢铁(集团)有限责任公司 | MgO-C material slag line brick for steel ladle |
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| CN101943607A (en) * | 2010-08-31 | 2011-01-12 | 马鞍山钢铁股份有限公司 | Inlaid type infrared temperature-measuring tube for continuous temperature measurement of liquid steel as well as components and preparation method thereof |
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| CN102093065A (en) * | 2010-12-30 | 2011-06-15 | 中南大学 | Magnesia carbon brick taking composite magnesia as major raw material and preparation method thereof |
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| CN107075594A (en) * | 2014-09-23 | 2017-08-18 | 斯旺西大学 | Inlet port is configured and its manufacturing process |
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| CN110282987A (en) * | 2019-07-03 | 2019-09-27 | 辽宁科技大学 | The manufacturing method of vanadium-nitrogen alloy sintering furnace magnesium aluminate spinel vacuum insulating brick |
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| CN113213897A (en) * | 2021-06-23 | 2021-08-06 | 郑州振东科技有限公司 | Steel ladle low-carbon aluminum-magnesium-carbon brick |
| CN113213897B (en) * | 2021-06-23 | 2022-08-19 | 郑州振东科技有限公司 | Steel ladle low-carbon aluminum-magnesium-carbon brick |
| CN116813362A (en) * | 2023-08-31 | 2023-09-29 | 山东海泰高温材料有限公司 | Low-carbon magnesia carbon brick for refining ladle and preparation method thereof |
| CN116813362B (en) * | 2023-08-31 | 2023-12-05 | 山东海泰高温材料有限公司 | Low-carbon magnesia carbon brick for refining ladle and preparation method thereof |
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