CN103274710B - Al2o3-Mgo-Cr2o3 casting material for insert tube of RH vacuum furnace - Google Patents
Al2o3-Mgo-Cr2o3 casting material for insert tube of RH vacuum furnace Download PDFInfo
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- CN103274710B CN103274710B CN201310240440.XA CN201310240440A CN103274710B CN 103274710 B CN103274710 B CN 103274710B CN 201310240440 A CN201310240440 A CN 201310240440A CN 103274710 B CN103274710 B CN 103274710B
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Abstract
The invention discloses a Al2o3-Mgo-Cr2o3 casting material for an insert tube of an RH vacuum furnace, which is composed of a basic material and an additive, wherein the basic material comprises the following components by weight percent: 40-60 percent of white fused corundum, 5-25 percent of waste magnesite-chrome brick, 1-10 percent of fused magnesia powder, 1-10 percent of ultrafine spinel powder, 2-15 percent of activated alumina powder, and 1-8 percent of calcium aluminate cement group; and the additive is composed of an FDN water-reducing agent about 0.1-1 percent of basic material in total weight, and explosion-proof organic fibers about 0.10-0.20 percent of basic material in total weight. Practice shows that the casting material is strong in slag erosion resistance, excellent in thermal shock resistance, and can effectively prolong the service life of the insert tube.
Description
Technical field
The refractory materials that the present invention relates to use in field of iron and steel smelting, specifically a kind of RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material.
Background technology
RH vacuum oven is in external refining process, to produce one of indispensable visual plant of high quality steel, RH vacuum oven tubular stinger is owing to directly contacting with slag with molten steel, be that RH vacuum oven is etched maximum position, its work-ing life is the shortest in the each position of RH vacuum oven.Change the increase of tubular stinger frequency, make the intermittent time between heat elongated, cause temperature fluctuation in stove to become large, increased again the probability of internal vacuum chamber shelling of refractory, therefore, RH vacuum oven tubular stinger has restricted the length of a RH vacuum furnace service life by life-span of refractory materials or wearing quality.Tubular stinger liner adopts magnesia chrome brick at present, the outside magnalium (Al that adopts
2o
3-MgO) matter or aluminate (Al
2o
3-MgO Al
2o
3) mould material of matter, these mould material anti-scour properties, slag penetration resistance and heat-shock resistance are poor, are prone to crackle and cause structure spalling, thereby affected production efficiency and caused production cost to increase.
Summary of the invention
Object of the present invention is exactly that the RH vacuum oven tubular stinger Al that a kind of anti-scour property is strong, heat-shock resistance is good and can effectively extend the work-ing life of tubular stinger will be provided
2o
3-MgO-Cr
2o
3matter mould material.
For achieving the above object, the designed RH vacuum oven tubular stinger Al of the present invention
2o
3-MgO-Cr
2o
3matter mould material, its special character is, and this mould material is made up of major ingredient and admixture, and the component of major ingredient is by weight percentage:
Fused white corundum 40 ~ 60%,
Useless magnesia chrome brick 5 ~ 25%,
Electrofusion magnesia powder 1 ~ 10%,
Ultra-fine Spinel micropowder 1 ~ 10%,
Active oxidation aluminium powder 2 ~ 15%,
Aluminous cement group 1 ~ 8%,
Described admixture comprises: accounts for the FDN water reducer of major ingredient gross weight 0.1 ~ 1%, and accounts for the explosion-proof organic fibre of major ingredient gross weight 0.10 ~ 0.20%,
Wherein: the granularity≤0.1mm of described electrosmelted magnesite clinker, the granularity≤25 μ m of described ultra-fine Spinel micropowder, the granularity≤0.1mm of described active oxidation aluminium powder.
Preferably, described explosion-proof organic fibre is one or both in polypropylene fibre or polyethylene fibre.
Further, the size of various particles and account for fused white corundum total weight percent and be in described fused white corundum: 3mm < granularity≤8mm accounts for 20 ~ 40%; 1mm < granularity≤3mm accounts for 20 ~ 40%; 0.1mm < granularity≤1mm accounts for 10 ~ 30%; Granularity≤0.1mm accounts for 10 ~ 20%.
Again further, described useless magnesia chrome brick be RH vacuum oven with after magnesia chrome brick after break process, form, its granular size and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 10 ~ 40%; 1mm < granularity≤3mm accounts for 10 ~ 40%; 0.1mm < granularity≤1mm accounts for 10 ~ 30%.
RH vacuum oven tubular stinger Al of the present invention
2o
3-MgO-Cr
2o
3the selection of the each component of matter mould material is with the principle of weight percentage control: this mould material selects fused white corundum to become aggregate with useless magnesia chrome brick complex group, add the electrofusion magnesia powder of suitable proportion simultaneously, and strictly controlled fused white corundum and useless magnesia chrome brick usage ratio, and control and in mould material, formed a certain amount of magnesia size composition and add-on.The microdilatancy that this mould material is reacted the generation of original position generation magnesium-aluminium spinel in the time of pyroprocessing can compensate the contraction that sintering brings, its globality is remained unchanged, produce tiny crack, buffering stress simultaneously, improve the heat-shock resistance of mould material, reach good structural stability and spalling resistance.The present invention also adds the granular size of useless magnesia chrome brick and electrosmelted magnesite clinker to control the speed that spinel generates by control; Thereby the content of controlling the spinel of mould material situ generation by controlling the add-on of useless magnesia chrome brick and electrosmelted magnesite clinker fine powder is controlled the quantity of tiny crack in mould material; The content of the ultra-fine Spinel micropowder adding by control is controlled the total content of spinel in mould material.The ultra-fine Spinel micropowder of the granularity≤25 μ m using in the present invention, can acceleration of sintering, strengthens compactness and the hot strength of mould material, can improve like this heat-shock resistance and the intensity of mould material simultaneously.In addition, the useless magnesia chrome brick adding reacts in sintering process with fused white corundum and forms magnesia chrome spinel and chromium corundum sosoloid, can improve the slag resistance of mould material.The present invention adopts FDN water reducer and explosion-proof organic fibre as admixture, and wherein, FDN water reducer has excellent diminishing function, helps and improves the effect of material monolithic intensity, and explosion-proof organic fibre has the moisture of being beneficial to and discharges the local decrepitation of prevention material.
As the optimization of scheme, by being carried out to grain composition, fused white corundum and useless magnesia chrome brick can realize the maximum densification of material, improve greatly the over-all properties of refractory materials.
Embodiment
Below in conjunction with the specific embodiment RH vacuum oven tubular stinger Al designed to the present invention
2o
3-MgO-Cr
2o
3matter mould material is described in further detail.
Embodiment 1
A kind of RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material, is made up of major ingredient and admixture, and the component of major ingredient is by weight percentage:
Fused white corundum accounts for 50%,
Useless magnesia chrome brick accounts for 20%,
Electrofusion magnesia powder accounts for 8%,
Ultra-fine Spinel micropowder accounts for 10%,
Active oxidation aluminium powder accounts for 7%,
Aluminous cement group accounts for 5%,
Admixture comprise account for major ingredient gross weight 1% FDN water reducer, account for the explosion-proof organic fibre of major ingredient gross weight 0.15%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, granularity≤25 μ the m of Spinel micropowder, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre is polypropylene fibre; The size of various particles and account for fused white corundum total weight percent and be in fused white corundum: 3mm < granularity≤8mm accounts for 40%; 1mm < granularity≤3mm accounts for 20%; 0.1mm < granularity≤1mm accounts for 30%; Granularity≤0.1mm accounts for 10%; Useless magnesia chrome brick be RH vacuum oven with after magnesia chrome brick, be broken into different-grain diameter, wherein, the size of various particles and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 40%; 1mm < granularity≤3mm accounts for 30%; 0.1mm < granularity≤1mm accounts for 30%.
Embodiment 2
A kind of RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material, is made up of major ingredient and admixture, and the component of major ingredient is by weight percentage:
Fused white corundum accounts for 55%,
Useless magnesia chrome brick accounts for 18%,
Electrofusion magnesia powder accounts for 7%,
Ultra-fine Spinel micropowder accounts for 5%,
Active oxidation aluminium powder accounts for 9%,
Aluminous cement group accounts for 6%,
Admixture comprise account for major ingredient gross weight 0.8% FDN water reducer, account for the explosion-proof organic fibre of major ingredient gross weight 0.1%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, granularity≤25 μ the m of Spinel micropowder, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre is polypropylene fibre; The size of various particles and account for fused white corundum total weight percent and be in fused white corundum: 3mm < granularity≤8mm accounts for 35%; 1mm < granularity≤3mm accounts for 25%; 0.1mm < granularity≤1mm accounts for 25%; Granularity≤0.1mm accounts for 15%; In useless magnesia chrome brick, the size of various particles and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 30%; 1mm < granularity≤3mm accounts for 40%; 0.1mm < granularity≤1mm accounts for 30%.
Embodiment 3
A kind of RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material, is made up of major ingredient and admixture, and the component of major ingredient is by weight percentage:
Fused white corundum accounts for 45%,
Useless magnesia chrome brick accounts for 25%,
Electrofusion magnesia powder accounts for 10%,
Ultra-fine Spinel micropowder accounts for 5%,
Active oxidation aluminium powder accounts for 10%,
Aluminous cement group accounts for 5%,
Admixture comprise account for major ingredient gross weight 1% FDN water reducer, account for the explosion-proof organic fibre of major ingredient gross weight 0.2%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, granularity≤25 μ the m of Spinel micropowder, granularity≤the 0.1mm of active oxidation aluminium powder, explosion-proof organic fibre is that polypropylene fibre and polyethylene fibre are mixed by any ratio; The size of various particles and account for fused white corundum total weight percent and be in fused white corundum: 3mm < granularity≤8mm accounts for 30%; 1mm < granularity≤3mm accounts for 30%; 0.1mm < granularity≤1mm accounts for 30%; Granularity≤0.1mm accounts for 10%; In useless magnesia chrome brick, the size of various particles and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 30%; 1mm < granularity≤3mm accounts for 30%; 0.1mm < granularity≤1mm accounts for 40%.
Embodiment 4
A kind of RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material, is made up of major ingredient and admixture, and the component of major ingredient is by weight percentage:
Fused white corundum accounts for 60%,
Useless magnesia chrome brick accounts for 15%,
Electrofusion magnesia powder accounts for 5%,
Ultra-fine Spinel micropowder accounts for 7%,
Active oxidation aluminium powder accounts for 8%,
Aluminous cement group accounts for 5%,
Admixture comprise account for major ingredient gross weight 0.5% FDN water reducer, account for the explosion-proof organic fibre of major ingredient gross weight 0.1%, granularity≤the 0.1mm of electrosmelted magnesite clinker, granularity≤25 μ the m of Spinel micropowder, granularity≤the 0.1mm of active oxidation aluminium powder, explosion-proof organic fibre is that polypropylene fibre and polyethylene fibre are mixed by any ratio; The size of various particles and account for fused white corundum total weight percent and be in fused white corundum: 3mm < granularity≤8mm accounts for 22%; 1mm < granularity≤3mm accounts for 28%; 0.1mm < granularity≤1mm accounts for 32%; Granularity≤0.1mm accounts for 18%; In useless magnesia chrome brick, the size of various particles and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 38%; 1mm < granularity≤3mm accounts for 35%; 0.1mm < granularity≤1mm accounts for 27%.
Embodiment 5
A kind of RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material, is made up of major ingredient and admixture, and the component of major ingredient is by weight percentage:
Fused white corundum accounts for 50%,
Useless magnesia chrome brick accounts for 25%,
Electrofusion magnesia powder accounts for 5%,
Ultra-fine Spinel micropowder accounts for 8%,
Active oxidation aluminium powder accounts for 6%,
Aluminous cement group accounts for 6%,
Admixture comprise account for major ingredient gross weight 1% FDN water reducer, account for the explosion-proof organic fibre of major ingredient gross weight 0.15%, granularity≤the 0.1mm of electrosmelted magnesite clinker, granularity≤25 μ the m of Spinel micropowder, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre is polyethylene fibre; The size of various particles and account for fused white corundum total weight percent and be in fused white corundum: 3mm < granularity≤8mm accounts for 20%; 1mm < granularity≤3mm accounts for 30%; 0.1mm < granularity≤1mm accounts for 30%; Granularity≤0.1mm accounts for 20%; In useless magnesia chrome brick, the size of various particles and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 35%; 1mm < granularity≤3mm accounts for 35%; 0.1mm < granularity≤1mm accounts for 30%.
Embodiment 6
A kind of RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material, is made up of major ingredient and admixture, and the component of major ingredient is by weight percentage:
Fused white corundum accounts for 60%,
Useless magnesia chrome brick accounts for 20%,
Electrofusion magnesia powder accounts for 5%,
Ultra-fine Spinel micropowder accounts for 5%,
Active oxidation aluminium powder accounts for 5%,
Aluminous cement group accounts for 5%,
Admixture comprise account for major ingredient gross weight 0.8% FDN water reducer, account for the explosion-proof organic fibre of major ingredient gross weight 0.15%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, granularity≤25 μ the m of Spinel micropowder, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre is polyethylene fibre; The size of various particles and account for fused white corundum total weight percent and be in fused white corundum: 3mm < granularity≤8mm accounts for 20%; 1mm < granularity≤3mm accounts for 30%; 0.1mm < granularity≤1mm accounts for 30%; Granularity≤0.1mm accounts for 20%; In useless magnesia chrome brick, the size of various particles and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 35%; 1mm < granularity≤3mm accounts for 35%; 0.1mm < granularity≤1mm accounts for 30%.
According to the compositional selecting starting material of the various embodiments described above, wherein useless magnesia chrome brick is the magnesia chrome brick after RH vacuum oven is used, and chooses the former brick layer of useless magnesia chrome brick, is broken into 3 ~ 8mm, 1 ~ 3mm, tri-kinds of size ranges of 0.1 ~ 1mm.Aggregate and substrate material are mixed, then add FDN water reducer and explosion-proof organic fibre to mix, add 3 ~ 5% water of compound total amount weight percent to stir, in whipping process, insert vibrating head vibration and be beneficial to exhaust.Mould material is made to the bar-shaped sample of 40 × 40 × 160mm, after batch mixing, stirring, moulding, maintenance, at 110 DEG C, be incubated 24h and heat-treat, prepare RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material.
Mould material performance to gained is tested, and adopts apparent porosity and the volume density of YB/T 5200-1993 test material; Adopt strength at normal temperature and the compressive strength of YB/T 5201-1993 test material; Adopt the line velocity of variation of YB/T 5203-1993 test material; Adopt the high temperature break resistant intensity of GB/T 3002-2007 test material; Adopt the heat-shock resistance of YB/T376.1-2004 standard testing material;
Scouring index (basicity of slag=3.4): adopt revolution anti-slag method that mould material sample is incubated to 2 hours in 1700 DEG C of rotary kilns, cut the horizontal section of sample, the scouring index of test samples.
The mould material finished product of each embodiment is all chosen 3 samples and is tested, and then gets the mean value of experimental data, the corresponding table 1 of listing in:
Table 1
Table 1 result shows, the RH vacuum oven tubular stinger Al preparing by component of the present invention
2o
3-MgO-Cr
2o
3matter mould material, its scouring index (basicity=3.4) is all less than 14% (conventional corundum castable is 14 ~ 17%), demonstrates it and has good anti-scour property, its heat-shock resistance/times (1100 DEG C, water-cooled) all exceed 4 times, show that it has good thermal shock resistance.Its volume density has all exceeded 3.15 g cm
-3, apparent porosity is all less than 14%, shows its compact structure.Its line velocity of variation is all less than 0.5%, illustrates that its expansibility and contractibility is little, is beneficial to construction.Its normal temperature strength and hot strength are higher, more can adapt to rugged environment in RH stove.
Claims (3)
1. a RH vacuum oven tubular stinger Al
2o
3-MgO-Cr
2o
3matter mould material, is characterized in that: this mould material is made up of major ingredient and admixture, and the each component of described major ingredient is by weight percentage:
Fused white corundum 40～60%,
Useless magnesia chrome brick 5～25%,
Electrofusion magnesia powder 1～10%,
Ultra-fine Spinel micropowder 1～10%,
Active oxidation aluminium powder 2～15%,
Aluminous cement group 1～8%,
Described admixture comprises: accounts for the FDN water reducer of major ingredient gross weight 0.1～1%, and accounts for the explosion-proof organic fibre of major ingredient gross weight 0.10～0.20%,
Wherein: the granularity≤0.1mm of described electrofusion magnesia powder, the granularity≤25 μ m of described ultra-fine Spinel micropowder, the granularity≤0.1mm of described active oxidation aluminium powder;
Described useless magnesia chrome brick is that the magnesia chrome brick after RH vacuum oven is used forms after break process, its granular size and account for useless magnesia chrome brick total weight percent and be: 3mm < granularity≤8mm accounts for 10～40%, 1mm < granularity≤3mm accounts for 10～40%, 0.1mm < granularity≤1mm and accounts for 10～30%.
2. RH vacuum oven tubular stinger Al according to claim 1
2o
3-MgO-Cr
2o
3matter mould material, is characterized in that: described explosion-proof organic fibre is one or both in polypropylene fibre or polyethylene fibre.
3. RH vacuum oven tubular stinger Al according to claim 1 and 2
2o
3-MgO-Cr
2o
3matter mould material, it is characterized in that: the size of various particles and account for fused white corundum total weight percent and be in described fused white corundum: 3mm < granularity≤8mm accounts for 20～40%, 1mm < granularity≤3mm accounts for 20～40%, 0.1mm < granularity≤1mm accounts for 10～30%, and granularity≤0.1mm accounts for 10～20%.
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| CN103482989B (en) * | 2013-09-06 | 2014-12-10 | 浙江自立股份有限公司 | Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable |
| CN104609870A (en) * | 2013-12-16 | 2015-05-13 | 岑溪市新建球陶瓷有限公司 | Preparation method of porous brick |
| CN104355636B (en) * | 2014-10-31 | 2016-05-11 | 浙江金磊高温材料股份有限公司 | A kind of RH stove dip pipe castable and preparation method thereof |
| RU2625580C1 (en) * | 2016-05-26 | 2017-07-17 | Общество с ограниченной ответственностью "СпецОгнеупорКомплект" | Refractory concrete mixture for hearth lining of thermal units |
| CN107352978B (en) * | 2017-08-30 | 2020-10-27 | 徐州贝克福尔节能环保技术有限公司 | High-strength anti-seepage brick and preparation process thereof |
| CN108863411A (en) * | 2018-06-20 | 2018-11-23 | 德清凯瑞新材料有限公司 | A kind of regenerative magnesia spinel matter dry-type vibration material and preparation method thereof |
| CN115385681A (en) * | 2022-08-29 | 2022-11-25 | 郑州瑞泰耐火科技有限公司 | Magnesium-aluminum-chromium spinel castable and preparation method thereof |
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| CN103114178A (en) * | 2013-03-06 | 2013-05-22 | 攀钢集团攀枝花钢铁研究院有限公司 | RH refining furnace, insertion tube thereof and preparation method |
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