CN1740115A - Sailon corundum refractory material for permeable ladle stopper and its prepn process - Google Patents

Sailon corundum refractory material for permeable ladle stopper and its prepn process Download PDF

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Publication number
CN1740115A
CN1740115A CNA200410060767XA CN200410060767A CN1740115A CN 1740115 A CN1740115 A CN 1740115A CN A200410060767X A CNA200410060767X A CN A200410060767XA CN 200410060767 A CN200410060767 A CN 200410060767A CN 1740115 A CN1740115 A CN 1740115A
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China
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corundum
preparation
refractory materials
porous plug
grand
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CNA200410060767XA
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CN1300058C (en
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李亚伟
金胜利
李楠
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Wuhan University of Science and Engineering WUSE
Wuhan University of Science and Technology WHUST
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Wuhan University of Science and Engineering WUSE
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Abstract

The refractory sialon corundum brick material for permeable ladle stopper is prepared with corundum 65-75 wt%, metal silicon powder 5-12 wt%, alumina powder 3-10 wt%, silica powder 1-5 wt%, pure calcium aluminate cement 0-8 wt%, dispersed alumina 0-10 wt%, water reducing agent 4-6 wt% and water 4-6 wt%, and through stirring, vibration forming, pouring to form permeating pre-fabricated part, drying, and nitrogenating and sintering directly in nitrogen atmosphere. The present invention has simple preparation process, low treating temperature, cheap material, and the prepared refractory material has excellent slag resistance, excellent molten iron fuse loss resistance, high heat shock stability, high wear resistance and high finished product rate.

Description

A kind of ladle porous plug is with matching grand corundum based refractory materials and preparation method
One, technical field
The invention belongs to technical field of refractory materials.Relate in particular to a kind of ladle porous plug with matching grand corundum based refractory materials and preparation method.
Two, background technology
The ladle porous plug is to one of major parts of molten steel blowing device, it uses the position condition the harshest, not only to bear produce in thermal shocking in the use, the molten steel whipping process huge and wash away and deteriorate and the erosion of high-temperature slag, also will bring into play the airing function of giving it as structured material.In general, the porous plug material that different steelworkss adopt also is not quite similar, as corundum spinelle, corundum-mullite, high alumina corundum, chromium corundum etc.The thermal structure intensity difference of zirconium-mullite and corundum matter a little less than the erosion resistibility, influences its work-ing life.The Heat stability is good of high alumina-corundum matter, long service life, but wash away with the corrode loss also big (Fan Tianxi etc. straight-through multi-hole type gas permeable brick is at [J] on probation of 60t refining ladle. iron and steel, 1989,24 (6): 26~29).The chromium corundum material has excellent physical chemistry because of it such as chemical resistance of concrete, heat-shock resistance and wear resistance become one of material of widespread use, but the ecotope (Wu Aijun etc. that had severe contamination of chromium element, the performance of chrome corundum brick and application [J]. refractory materials, 2001,35 (3): 165~166).Therefore seek and the porous plug of Development of New Generation environmental friendliness and excellent property becomes people with material and studies focus.
In recent ten years, because non-oxidized substance has characteristics such as good heat-shock resistance, thermal conductivity, anti-molten metal attack and wear resistance and obtains widely applying at fire resisting material field, be representative with silicon carbide, silicon nitride and Sai Long especially.As " a kind of refined steel ladles refractory material for slot-type ventilating brick and making method " (CN02137247.3) patented technology, press the required stoicheiometry of molecular formula of β-sialon, select suitable oxide compound, nitride and SiC particle, cooperate batch mixing compression moulding, sintering to form with certain proportion, work-ing life is considerably beyond common refractory.Obvious crackle is not found on surface at the Sailong and silicon carbide combined refractory materials, does not have the interaction of discovery and molten pig iron yet.As seen it resists molten steel infiltration and slag or metal oxide corrosive validity.But related goods raw material is as AlN and sintering agent rare earth compound Y 2O 3Cost an arm and a leg, the mechanical pressing mode is not suitable for complicated shape processing, the temperature required height of treatment articles, so its production cost height, and complex process, scale operation is restricted.
Three, summary of the invention
Task of the present invention provides the ladle porous plug that a kind of technology is simple, cost is moderate, treatment temp is low and swells/silicon nitride/corundum multiple phase refractory material technology of preparing with match, and prepared refractory materials should have good resistance to slag corrosion, anti-molten iron melting loss, anti-thermal shock stability, wear resistance and blow out rate height, environmentally friendly.
For finishing above-mentioned task, the technical solution adopted in the present invention is: corundum in granules and fine powder, metallic silicon power, alumina powder, fine silica powder, pure calcium aluminate cement, dispersed alumina are mixed, add water reducer and water, burn till through stirring, moulding, drying, segmentation insulation.
Each above-mentioned weight percentages of components is: corundum is 65~75%, metallic silicon power is 5~12%, alumina powder is 3~10%, fine silica powder is 1~5%, pure calcium aluminate cement is 0~8%, dispersed alumina is 0~10%, adds water reducer and be 0~1%, water is 4~6%.
Described corundum is compact alumina or brown corundum, in 65~75% corundum, its grain composition and weight ratio thereof are: 8~5mm is 20~30%, 5~3mm is 15~20%, 3~1mm is 10~15%, 1~0mm is 5~10%, be 5~10% less than 0.088mm.Water reducer is a sodium phosphate.
Processing condition of the present invention are: mix and stir, adopt the vibratory compaction mode, pour into the porous plug prefabricated component.Dry back is carried out nitrogenize and is burnt till under nitrogen atmosphere, used nitrogen is industrial nitrogen, and firing temperature is room temperature~1500 ℃.The segmentation insulation is to be incubated 12~24 hours under 1000~1300 ℃ of conditions, is warmed up to 1400~1500 ℃ then, is incubated 5~10 hours with this understanding, and temperature rise rate is 0.5~1 ℃/minute.
Owing to adopt technique scheme, the present invention has the advantages that technology is simple, treatment temp is low, cost of material is cheap, and Sai Long/silicon nitride of being produced/corundum multiple phase refractory material has good resistance to slag corrosion, anti-molten iron melting loss, anti-thermal shock stability and wear resistance, goods are environmentally friendly, cost performance is high.As the porous plug material, on-the-spot actual use the on the ladle of different tonnages, than original chromium corundum material, improve work-ing life greatly, and access times exceed more than one times, and after each tapping, need not to burn oxygen blows logical, the rate of blowing out reaches 100%, has shortened the ladle refining treatment time, has reached efficient, the safety of liquid steel refining, reliable and full on-the-spot service requirements.
Four, embodiment
Embodiment 1:
Take by weighing a certain amount of fused brown corundum particle and fine powder, metallic silicon power, alumina powder, fine silica powder, pure calcium aluminate cement.Its weight percent is: metallic silicon power is 6~10%, alumina powder is 5~9%, fine silica powder is 2~5%, pure calcium aluminate cement is 1.5~6.5%, brown corundum 70~75%.Wherein, brown corundum in granules grating and weight ratio thereof are: 8~5mm accounts for 20~30%, 5~3mm accounts for 15~20%, 3~1mm accounts for 10~15%, 1~0mm accounts for 5~10%, accounts for mm5~10% less than 0.088.
Its processing condition are: above-mentioned compound is put into sand mill mix, add 0.3% sodium phosphate water reducer and 5% water simultaneously, stirred 2~3 minutes.Vibration is 30 times on diving tower, measures yield point value and is higher than casting behind the 120mm.Natural curing 12 hours, the demoulding 110 ℃ of dryings 24 hours, is burnt till under the nitrogen atmosphere in nitriding furnace in baking oven.Firing range is room temperature~1450 ℃, and used nitrogen is industrial nitrogen.The segmentation insulation is 1100~1200 ℃ of insulations 15~18 hours, is warmed up to 1400~1450 ℃ of insulations 6~9 hours then, and temperature rise rate is 0.5~1 ℃/minute.
Main thing in the X-ray diffraction test article be mutually β-Sai Long, silicon nitride phase, corundum mutually and a spot of o '-Sai Long mutually, wherein nitrogen content 3~5%.Detecting its performance is volume density 3.2~3.32g/cm 3, apparent porosity 13~14%, compressive strength is higher than 120Mpa, high temperature break resistant intensity 13~30Mpa.
Embodiment 2:
Take by weighing a certain amount of electric smelting compact alumina particle and fine powder, metallic silicon power, alumina powder, fine silica powder, dispersed alumina.Its weight percent is: metallic silicon power is 6~10%, alumina powder accounts for 5~9%, fine silica powder accounts for 2~5%, dispersed alumina accounts for 1.5~6.5%, compact alumina accounts for 70~75%.Wherein, compact alumina grain composition and weight ratio thereof are: 8~5mm accounts for that 20-30%, 5~3mm account for 15~20%, 3~1mm accounts for 10~15%, 1~0mm accounts for 5~10%, accounts for 5~10% less than 0.088mm.
Its processing condition are: above-mentioned compound is put into sand mill mix, add 0.3% sodium phosphate water reducer and 5% water simultaneously, stirred 2~3 minutes.Vibration is 30 times on diving tower, and measure yield point value and be higher than casting behind the 120mm, natural curing 12 hours, the demoulding places baking oven 110 ℃ of dryings 24 hours, burns till under the nitrogen atmosphere in nitriding furnace.Firing range is room temperature~1500 ℃, and used nitrogen is industrial nitrogen.The segmentation insulation is 1200~1300 ℃ of insulations 10~15 hours, is warmed up to 1450~1500 ℃ of insulations 6~9 hours then, 0.5~1 ℃/minute of temperature rise rate.
Dispose, the main thing in the X-ray diffraction test article be mutually β-Sai Long, silicon nitride phase, corundum mutually and a spot of o '-Sai Long mutually, wherein nitrogen content 3~5%.Detecting its performance is volume density 3.25~3.32g/cm 3, apparent porosity 13~14%, compressive strength is higher than 120Mpa, high temperature break resistant intensity 13~30Mpa.

Claims (7)

1, a kind of ladle porous plug preparation method of the grand corundum based refractory materials of match, it is characterized in that corundum in granules and fine powder, metallic silicon power, alumina powder, fine silica powder, pure calcium aluminate cement, dispersed alumina are mixed, add water reducer and water, burn till through stirring, moulding, drying, segmentation insulation.
2, the ladle porous plug according to claim 1 preparation method of the grand corundum based refractory materials of match, it is characterized in that described each weight percentages of components is: corundum is 65~75%, metallic silicon power is 5~12%, alumina powder is 3~10%, fine silica powder is 1~5%, pure calcium aluminate cement is 0~8%, dispersed alumina is 0~10%, adds water reducer and be 0~1%, water is 4~6%.
3, the ladle porous plug according to claim 2 preparation method of the grand corundum based refractory materials of match, it is characterized in that described corundum is compact alumina or brown corundum, in 65~75% corundum, its grain composition and weight ratio thereof are: 8~5mm is 20~30%, 5~3mm is 15~20%, 3~1mm is 10~15%, 1~0mm is 5~10%, be 5~10% less than 0.088mm.
4, ladle porous plug according to claim 1 is characterized in that with the preparation method of the grand corundum based refractory materials of match described moulding is to adopt the vibratory compaction mode, pours into the porous plug prefabricated component.
5, the ladle porous plug according to claim 1 preparation method of the grand corundum based refractory materials of match, it is characterized in that described burning till is that dry back is carried out nitrogenize and burnt till under nitrogen atmosphere, used nitrogen is industrial nitrogen, firing temperature is room temperature~1500 ℃, the segmentation insulation is to be incubated 12~24 hours under 1000~1300 ℃ of conditions, is warmed up to 1400~1500 ℃ then, is incubated 5~10 hours with this understanding, temperature rise rate is 0.5~1 ℃/minute.
6, ladle porous plug according to claim 1 is characterized in that with the preparation method of the grand corundum based refractory materials of match described water reducer is a sodium phosphate.
7, according to the refractory materials of the described ladle porous plug of claim 1~6 with preparation method's preparation of the grand corundum based refractory materials of match.
CNB200410060767XA 2004-08-25 2004-08-25 Sailon corundum refractory material for permeable ladle stopper and its prepn process Expired - Fee Related CN1300058C (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101823892A (en) * 2010-04-29 2010-09-08 河南科技大学 Cement-free in-situ silicon nitride combined silicon carbide prefabricated member and preparation method thereof
CN102249719A (en) * 2011-06-24 2011-11-23 郑州振东耐磨材料有限公司 Light-burning corundum precast block for refining steel ladle
CN102276273A (en) * 2011-07-15 2011-12-14 郑州大学 Silicon nitride and corundum combined breathable bricks and preparation method
CN102329126A (en) * 2011-07-15 2012-01-25 郑州大学 In-situ formed beta-Sialon combined corundum prefabricated member and production method thereof
CN102503492A (en) * 2011-11-10 2012-06-20 中钢集团洛阳耐火材料研究院有限公司 Low-cost, low-density and high-CaO corundum castable and preparation method thereof
CN102503353A (en) * 2011-10-31 2012-06-20 神华集团有限责任公司 Abrasion-resisting lining material
CN107986804A (en) * 2017-12-11 2018-05-04 洛阳名力科技开发有限公司 A kind of neutral refractory
CN109627040A (en) * 2019-02-27 2019-04-16 佛山石湾鹰牌陶瓷有限公司 Lightweight thermal insulation brick
CN112028647A (en) * 2020-08-25 2020-12-04 贵阳明通炉料有限公司 High-performance sialon corundum plastic material and preparation method thereof
WO2022144013A1 (en) * 2020-12-31 2022-07-07 郑州轻工业大学 Corundum-based micro-nano-porous heat insulating refractory material and preparation method therefor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1255354C (en) * 2002-07-24 2006-05-10 宝山钢铁股份有限公司 High-temperature ceramic refractory material and its manufacturing method
CN1289241C (en) * 2003-01-07 2006-12-13 武汉科技大学 Preparation method of Al2O3-MgO-ZrO2 ladle air plug

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101823892B (en) * 2010-04-29 2012-08-08 河南科技大学 Cement-free in-situ silicon nitride combined silicon carbide prefabricated member and preparation method thereof
CN101823892A (en) * 2010-04-29 2010-09-08 河南科技大学 Cement-free in-situ silicon nitride combined silicon carbide prefabricated member and preparation method thereof
CN102249719A (en) * 2011-06-24 2011-11-23 郑州振东耐磨材料有限公司 Light-burning corundum precast block for refining steel ladle
CN102249719B (en) * 2011-06-24 2013-03-06 郑州振东科技有限公司 Light-burning corundum precast block for refining steel ladle
CN102329126A (en) * 2011-07-15 2012-01-25 郑州大学 In-situ formed beta-Sialon combined corundum prefabricated member and production method thereof
CN102276273A (en) * 2011-07-15 2011-12-14 郑州大学 Silicon nitride and corundum combined breathable bricks and preparation method
CN102503353A (en) * 2011-10-31 2012-06-20 神华集团有限责任公司 Abrasion-resisting lining material
CN102503353B (en) * 2011-10-31 2013-10-30 神华集团有限责任公司 Abrasion-resisting lining material
CN102503492A (en) * 2011-11-10 2012-06-20 中钢集团洛阳耐火材料研究院有限公司 Low-cost, low-density and high-CaO corundum castable and preparation method thereof
CN107986804A (en) * 2017-12-11 2018-05-04 洛阳名力科技开发有限公司 A kind of neutral refractory
CN109627040A (en) * 2019-02-27 2019-04-16 佛山石湾鹰牌陶瓷有限公司 Lightweight thermal insulation brick
CN112028647A (en) * 2020-08-25 2020-12-04 贵阳明通炉料有限公司 High-performance sialon corundum plastic material and preparation method thereof
WO2022144013A1 (en) * 2020-12-31 2022-07-07 郑州轻工业大学 Corundum-based micro-nano-porous heat insulating refractory material and preparation method therefor

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