CN103274710A - 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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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 present invention relates to employed refractory materials in the field of iron and steel smelting, specifically is a kind of RH vacuum oven tubular stinger Al
2O
3-MgO-Cr
2O
3The matter mould material.
Background technology
The RH vacuum oven is to produce one of indispensable visual plant of high quality steel in the external refining process, RH vacuum oven tubular stinger is owing to directly contact with slag with molten steel, be that the RH vacuum oven is etched maximum position, its work-ing life is the shortest in each position of RH vacuum oven.Change the increase of tubular stinger frequency, make the intermittent time between the heat elongated, cause the interior temperature fluctuation of stove to become big, increased the probability of internal vacuum chamber shelling of refractory again, therefore, the RH vacuum oven tubular stinger length that restricted a RH vacuum furnace service life with life-span or the wearing quality of refractory materials.The 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 relatively poor, are prone to crackle and cause structure spalling, thereby influenced production efficiency and caused production cost to increase.
Summary of the invention
Purpose 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 prolong the work-ing life of tubular stinger will be provided
2O
3-MgO-Cr
2O
3The matter 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 are that 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 micro mist 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 of described ultra-fine spinel micro mist≤25 μ m, the granularity≤0.1mm of described active oxidation aluminium powder.
Preferably, described explosion-proof organic fibre is one or both in polypropylene fibre or the polyethylene fibre.
Further, the size of various particles and account for the fused white corundum total weight percent and be in the 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 for the 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
3Each components selection of matter mould material is with the principle of weight percentage control: this mould material selects for use fused white corundum to become aggregate with useless magnesia chrome brick complex group, the electrofusion magnesia powder that adds suitable proportion simultaneously, and strictness controlled fused white corundum and useless magnesia chrome brick usage ratio, and controlled and form a certain amount of magnesia size composition and add-on in the mould material.This mould material is reacted the generation of original position generation magnesium-aluminium spinel when pyroprocessing microdilatancy 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 structural stability and spalling resistance preferably.The present invention also controls the speed that spinel generates by the granular size of the useless magnesia chrome brick of control adding and electrosmelted magnesite clinker; Thereby control the quantity of tiny crack in the content control mould material of generated in-situ spinel in the mould material by the add-on of controlling useless magnesia chrome brick and electrosmelted magnesite clinker fine powder; Control the total content of spinel in the mould material by the content of controlling the ultra-fine spinel micro mist that adds.The ultra-fine spinel micro mist of the granularity of using among the present invention≤25 μ m, but acceleration of sintering strengthen compactness and the hot strength of mould material, can improve heat-shock resistance and the intensity of mould material so simultaneously.In addition, the useless magnesia chrome brick of adding and fused white corundum react in sintering process and form 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, the FDN water reducer has excellent diminishing function, helps to improve 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 scheme optimization, by fused white corundum and useless magnesia chrome brick are carried out the maximum densification that grain composition can realize material, improve and improved the over-all properties of refractory materials greatly.
Embodiment
Below in conjunction with the specific embodiment RH vacuum oven tubular stinger Al designed to the present invention
2O
3-MgO-Cr
2O
3The matter mould material is described in further detail.
Embodiment 1
A kind of RH vacuum oven tubular stinger Al
2O
3-MgO-Cr
2O
3The matter 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 micro mist accounts for 10%,
The active oxidation aluminium powder accounts for 7%,
The aluminous cement group accounts for 5%,
Admixture comprises the FDN water reducer that accounts for major ingredient gross weight 1%, the explosion-proof organic fibre that accounts for major ingredient gross weight 0.15%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, the granularity of spinel micro mist≤25 μ m, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre are polypropylene fibre; The size of various particles and account for the fused white corundum total weight percent and be in the 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 for the RH vacuum oven with after magnesia chrome brick, it is 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
3The matter 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 micro mist accounts for 5%,
The active oxidation aluminium powder accounts for 9%,
The aluminous cement group accounts for 6%,
Admixture comprises the FDN water reducer that accounts for major ingredient gross weight 0.8%, the explosion-proof organic fibre that accounts for major ingredient gross weight 0.1%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, the granularity of spinel micro mist≤25 μ m, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre are polypropylene fibre; The size of various particles and account for the fused white corundum total weight percent and be in the 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 the 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
3The matter 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 micro mist accounts for 5%,
The active oxidation aluminium powder accounts for 10%,
The aluminous cement group accounts for 5%,
Admixture comprises the FDN water reducer that accounts for major ingredient gross weight 1%, the explosion-proof organic fibre that accounts for major ingredient gross weight 0.2%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, the granularity of spinel micro mist≤25 μ m, granularity≤the 0.1mm of active oxidation aluminium powder, explosion-proof organic fibre are that polypropylene fibre and polyethylene fibre mix by any ratio; The size of various particles and account for the fused white corundum total weight percent and be in the 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 the 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
3The matter 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 micro mist accounts for 7%,
The active oxidation aluminium powder accounts for 8%,
The aluminous cement group accounts for 5%,
Admixture comprises the FDN water reducer that accounts for major ingredient gross weight 0.5%, the explosion-proof organic fibre that accounts for major ingredient gross weight 0.1%, granularity≤the 0.1mm of electrosmelted magnesite clinker, the granularity of spinel micro mist≤25 μ m, granularity≤the 0.1mm of active oxidation aluminium powder, explosion-proof organic fibre are that polypropylene fibre and polyethylene fibre mix by any ratio; The size of various particles and account for the fused white corundum total weight percent and be in the 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 the 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
3The matter 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 micro mist accounts for 8%,
The active oxidation aluminium powder accounts for 6%,
The aluminous cement group accounts for 6%,
Admixture comprises the FDN water reducer that accounts for major ingredient gross weight 1%, the explosion-proof organic fibre that accounts for major ingredient gross weight 0.15%, granularity≤the 0.1mm of electrosmelted magnesite clinker, the granularity of spinel micro mist≤25 μ m, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre are polyethylene fibre; The size of various particles and account for the fused white corundum total weight percent and be in the 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 the 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
3The matter 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 micro mist accounts for 5%,
The active oxidation aluminium powder accounts for 5%,
The aluminous cement group accounts for 5%,
Admixture comprises the FDN water reducer that accounts for major ingredient gross weight 0.8%, the explosion-proof organic fibre that accounts for major ingredient gross weight 0.15%, wherein: the granularity≤0.1mm of electrosmelted magnesite clinker, the granularity of spinel micro mist≤25 μ m, the granularity≤0.1mm of active oxidation aluminium powder, explosion-proof organic fibre are polyethylene fibre; The size of various particles and account for the fused white corundum total weight percent and be in the 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 the 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%.
Select starting material according to the component of the various embodiments described above, wherein useless magnesia chrome brick for the RH vacuum oven with after magnesia chrome brick, choose the former brick layer of useless magnesia chrome brick, it is broken into 3 ~ 8mm, 1 ~ 3mm, three kinds of size ranges of 0.1 ~ 1mm.With aggregate and substrate material mixing, add FDN water reducer and explosion-proof organic fibre mixing then, 3 ~ 5% the water that adds compound total amount weight percent stirs, and inserts the vibrating head vibration in the whipping process and is beneficial to exhaust.Mould material is made the bar-shaped sample of 40 * 40 * 160mm, after batch mixing, stirring, moulding, maintenance, in 110 ℃ down insulation 24h heat-treat, prepare RH vacuum oven tubular stinger Al
2O
3-MgO-Cr
2O
3The matter 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 the anti-slag method of revolution that the mould material sample is incubated 2 hours in 1700 ℃ 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 gets the mean value of experimental data then, the corresponding table 1 of listing in:
Table 1
Table 1 result shows, the RH vacuum oven tubular stinger Al for preparing by component of the present invention
2O
3-MgO-Cr
2O
3The matter mould material, its scouring index (basicity=3.4) all less than 14% (conventional corundum castable is 14 ~ 17%), demonstrates it and has good anti-scour property, its heat-shock resistance/times (1100 ℃, water-cooled) all above 4 times, shows that it has good thermal shock resistance.Its volume density has all surpassed 3.15 g cm
-3, apparent porosity shows its compact structure all less than 14%.Its line velocity of variation illustrates that all less than 0.5% its expansion shrinkability is little, is beneficial to construction.Its normal temperature strength and hot strength are higher, more can adapt to rugged environment in the RH stove.
Claims (4)
1. RH vacuum oven tubular stinger Al
2O
3-MgO-Cr
2O
3The matter 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 micro mist 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 of described ultra-fine spinel micro mist≤25 μ m, the granularity≤0.1mm of described active oxidation aluminium powder.
2. RH vacuum oven tubular stinger Al according to claim 1
2O
3-MgO-Cr
2O
3The matter mould material is characterized in that: described explosion-proof organic fibre is one or both in polypropylene fibre or the polyethylene fibre.
3. RH vacuum oven tubular stinger Al according to claim 1 and 2
2O
3-MgO-Cr
2O
3The matter mould material, it is characterized in that: the size of various particles and account for the fused white corundum total weight percent and be in the described fused white corundum: 3mm＜granularity≤8mm accounts for 20 ~ 40%, 1mm＜granularity≤3mm accounts for 20 ~ 40%, 0.1mm＜granularity≤1mm and accounts for 10 ~ 30%, and granularity≤0.1mm accounts for 10 ~ 20%.
4. RH vacuum oven tubular stinger Al according to claim 1 and 2
2O
3-MgO-Cr
2O
3The matter mould material, it is characterized in that: described useless magnesia chrome brick for the 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 and accounts for 10 ~ 30%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482989A (en) * | 2013-09-06 | 2014-01-01 | 浙江自立股份有限公司 | Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable |
| CN104355636A (en) * | 2014-10-31 | 2015-02-18 | 浙江金磊高温材料股份有限公司 | RH furnace dip pipe castable and preparation method thereof |
| 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 |
| RU2625580C1 (en) * | 2016-05-26 | 2017-07-17 | Общество с ограниченной ответственностью "СпецОгнеупорКомплект" | Refractory concrete mixture for hearth lining of thermal units |
| CN107352978A (en) * | 2017-08-30 | 2017-11-17 | 徐州贝克福尔节能环保技术有限公司 | A kind of high-strength antiseepage brick and its preparation technology |
| 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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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103482989A (en) * | 2013-09-06 | 2014-01-01 | 浙江自立股份有限公司 | Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable |
| 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 |
| CN104355636A (en) * | 2014-10-31 | 2015-02-18 | 浙江金磊高温材料股份有限公司 | RH furnace 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 |
| CN107352978A (en) * | 2017-08-30 | 2017-11-17 | 徐州贝克福尔节能环保技术有限公司 | A kind of high-strength antiseepage brick and its preparation technology |
| 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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Effective date of registration: 20170720 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Hubei, Wuhan, Wuchang Friendship Road, No. 999, block A, floor 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |