CN105565830B - Composite RH refining furnace dip pipe encasing and its moulding process - Google Patents

Composite RH refining furnace dip pipe encasing and its moulding process Download PDF

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CN105565830B
CN105565830B CN201510925906.9A CN201510925906A CN105565830B CN 105565830 B CN105565830 B CN 105565830B CN 201510925906 A CN201510925906 A CN 201510925906A CN 105565830 B CN105565830 B CN 105565830B
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corundum
partial size
micro mist
casting bed
dip pipe
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CN105565830A (en
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洪学勤
王志强
田先明
雷中兴
彭肖仟
何见林
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Wuhan Iron and Steel Group Corp
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Wuhan Iron and Steel Group Corp
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Abstract

A kind of composite RH refining furnace dip pipe encasing and its moulding process, the steel gallbladder outer body of the dip pipe in tubular construction is arranged in the encasing, outsourcing flame retardant coating is formed using integrated poured structure, which is composed of the exposed aerial top refractory casting bed of material and the lower part refractory casting bed of material being immersed in molten steel；The top refractory casting bed of material is using the corundum spinel castable prepared based on corundum reclaimed materials, wherein each component weight percent are as follows: corundum reclaimed materials 45~53%；Sintering plate corundum aggregate 17~28%；Fine powder 10~17%；Micro mist 8~15%；Bonding agent 3~7%；Water-reducing agent 0.1~0.5%；Organic explosion-proof fiber 0.05~0.15%；Stainless steel fibre 0.5~2.0%；The lower part refractory casting bed of material is using the corundum spinel castable prepared based on sintered microporous corundum aggregate, wherein each component weight percent are as follows: sintered microporous corundum aggregate 35~43%；Corundum aggregate 25~33% containing spinelle；Fine powder 10~17%；Micro mist 8~15%；Bonding agent 3~7%；Water-reducing agent 0.1~0.5%；Organic explosion-proof fiber 0.05~0.15%；Stainless steel fibre 0.5~2.0%.

Description

Composite RH refining furnace dip pipe encasing and its moulding process
Technical field
The present invention relates to Refractory For Steelmaking technical fields, in particular to a kind of composite RH refining furnace dip pipe outside Backpack body and its moulding process.
Background technique
RH refining furnace is that external refining produces indispensable one of the important equipment of high quality steel in the process.Dip pipe is made For in RH refining furnace pass in and out molten steel channel, subject molten steel high speed wash away, extremely it is cold very hot and steel slag acutely corrode etc. make With, be restrict RH refining furnace li` key link.
The primary structure of traditional RH dip pipe is: internal layer is built using leaching salt electric smelting combination magnesite-chrome brick layering, and outer layer is adopted With amorphous refractory moulding by casting, centre is using steel gallbladder as main body load-carrying members；It is filled out between internal layer and steel gallbladder with self-flowing material It fills, is welded with a large amount of Y shape or V-arrangement anchoring piece usually in the outside of steel gallbladder to fix castable.
The factor for influencing RH dip pipe service life specifically includes that the material of castable, pouring type, leaching on the outside of dip pipe The shape and the repairing treatment of user's use process etc. of stain pipe structure and its steel gallbladder.Under normal circumstances, due to dip pipe lower part For long period of soaking in molten steel, external refractory layer top and the bottom uneven heating is even, lower part refractory material often occurs and bursts the feelings such as fall off Condition.Currently, being the pour mass made of same refractory material casting on the outside of the most of RH dip pipes of steel mill, but due to raw material Rise in price, product cost improve, and many producers begin to use low-grade raw material substitution original raw material to carry out the production supply of material, this The service life of the RH dip pipe directly resulted in cannot be improved rapidly, or even decline situation occur.
Summary of the invention
The purpose of the present invention is to provide low, easy for construction, economic and environment-friendly compound of a kind of long service life, manufacturing cost Material RH refining furnace dip pipe encasing and its moulding process.
To achieve the above object, the composite RH refining furnace dip pipe encasing designed by the present invention is arranged in the leaching The steel gallbladder outer body of stain pipe in tubular construction forms outsourcing flame retardant coating using integrated poured structure, is characterized in that institute Outsourcing flame retardant coating is stated by the exposed aerial top refractory casting bed of material and the lower part refractory casting bed of material being immersed in molten steel It is composed；
The top refractory casting bed of material using the corundum spinel castable prepared based on corundum reclaimed materials, wherein Each component weight percent are as follows:
The lower part refractory casting bed of material using the corundum spinel castable prepared based on sintered microporous corundum aggregate, Wherein each component weight percent are as follows:
Simultaneously:
Partial size≤0.088mm of the fine powder, and the fine powder is mixed by component A and B component, the component A is Any one in fused white corundum and sintering plate corundum, the B component are the electricity of aluminum-spinel, content of MgO >=97% Any one in fused magnesia, the weight ratio of the component A and B component are 1~2: 1；
Partial size≤20 μm of the micro mist, and the micro mist is by SiO2Micro mist and active alpha-Al2O3Micro mist mixes, institute State SiO2Micro mist and active alpha-Al2O3The weight ratio of micro mist is 1: 10~20.
Further, the corundum reclaimed materials that the top refractory casting bed of material uses is carbon-free pre- with rear ladle corundum Product, with rear ladle corundum collector nozzle, with rear ladle corundum pocket block, in rear ladle corundum air supply brick brick cup One or more mixtures, entirety partial size≤12mm；It is described with the rear carbon-free prefabricated component of ladle corundum successively through sorting, It removes slag, be crushed, strong magnetic is except iron and screening process handle to obtain, wherein Al2O3Weight content >=97.5%, CaO weight content≤ 1.0%, Fe2O3Weight content≤0.8%.
Still further, the corundum reclaimed materials is divided by particle size: 8mm < partial size≤12mm, 5mm < partial size≤ 8mm, 3mm < partial size≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over corundum and return Weight percent in rewinding is successively are as follows: 18~22%, 28~32%, 18~22%, 13~17% and 13~15%.
Further, the sintering plate corundum aggregate that the top refractory casting bed of material uses is divided by particle size: 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm two, each grade fit over the weight percent in sintering plate corundum aggregate Successively are as follows: 50~60% and 40~50%.
Further, the Al in sintered microporous corundum aggregate that the lower part refractory casting bed of material uses2O3Content >= 99.5%, bulk density is 3.0~3.3g/cm3, it is closed porosity >=10%, average pore size≤0.5 μm inside particle, whole Partial size≤18mm.
Still further, the sintered microporous corundum aggregate is divided by particle size: 12mm < partial size≤18mm, 7mm < Partial size≤12mm, 3mm < partial size≤7mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over burning Tie the weight percent of micropore corundum aggregate successively are as follows: 18~22%, 28~32%, 18~22%, 13~17% and 13~ 15%.
Further, the Al in the corundum aggregate containing spinelle that the lower part refractory casting bed of material uses2O3Content >= 95%, content of MgO >=3%, Spinel content >=10%, entirety partial size≤5mm.
Still further, the corundum aggregate containing spinelle is divided by particle size: 3mm < partial size≤5mm, 1mm < Partial size≤3mm and 0mm < partial size≤gradation of 1mm tri-, each grade fit over the weight percent in the corundum aggregate containing spinelle Successively are as follows: 28~32%, 36~44% and 28~32%.
Further, in the mixed composition of the micro mist, SiO2The SiO of micro mist2Content >=92%, partial size≤5 μm；Activity α-Al2O3α-the Al of micro mist2O3Content >=99%, partial size≤10 μm.
Further, the bonding agent is one or both of pure calcium aluminate cement, hydrated alumina arbitrary proportion Mixture.
Further, the water-reducing agent is sodium tripolyphosphate, in calgon, polycarboxylic acids dehydragent ADS1/ADW1 One or more of arbitrary proportions mixture.
A kind of moulding process for above-mentioned composite RH refining furnace dip pipe encasing, comprising the following steps:
1) it is put into forced stirrer according to the weight percent by after the raw materials used weighing of the top refractory casting bed of material 2~3min is stirred, uniformly rear discharging to be mixed is spare；Equally, according to the weight percent by lower part refractory casting bed of material institute It after raw material weighing, puts into and stirs 2~3min in forced stirrer, uniformly rear discharging to be mixed is spare；
2) ring flange is installed in advance in the steel gallbladder bodies top of the tubular structure, and pacify in advance on the inside of steel gallbladder ontology It fills or pours and be poured in inner core flame retardant coating, its entirety is placed on working plate；Then, by the peripheral castable refractory fetal membrane of brush oil It is fixed on steel gallbladder ontology periphery, and guarantees the distance between steel gallbladder ontology and peripheral castable refractory fetal membrane uniformly；
3) the steel gallbladder ontology for adjusting distance and peripheral castable refractory fetal membrane are inverted are placed on shaking platform together；
4) add water and stir the top refractory casting bed of material is raw materials used, amount of water be raw materials used total weight 3.8~ 4.2%, 3~5min of mixing time are poured into after mixing evenly in the gap between steel gallbladder ontology and peripheral castable refractory fetal membrane, It opens shaking platform to be vibrated, while being inserted into vibrating head in castable and strengthening vibration；
5) when top, the refractory casting bed of material stops when being poured into setting height pouring into, while by lower part refractory casting bed of material institute It is added water and stirred with raw material, amount of water is 4.0~4.2%, 3~5min of mixing time of raw materials used total weight, after mixing evenly Continue to pour into the gap between steel gallbladder ontology and peripheral castable refractory fetal membrane, and is inserted into vibrating head in castable and strengthens vibration It is dynamic, until the bleeding of castable surface, form outsourcing flame retardant coating；
6) maintenance demoulding is carried out to the molding outsourcing flame retardant coating of steel gallbladder outer body, when room temperature is lower than 15 DEG C, at least certainly So maintenance 48h is demoulded again；When room temperature is higher than 15 DEG C, at least natural curing demoulds again for 24 hours；
7) continue natural curing 240h or more after demoulding to toast again；In baking process, first with the liter of 10~12 DEG C/h Warm speed is raised to 110 DEG C from room temperature, and 23~25h is kept the temperature at 110 DEG C；250 are warming up to again with the heating rate of 9~10 DEG C/h DEG C, 23~25h is kept the temperature at 250 DEG C；Be warming up to 450 DEG C again with the heating rate of 8~9 DEG C/h, at 450 DEG C keep the temperature 11~ Cease fire after 13h, natural cooling, cooling time be 12~for 24 hours, RH refining furnace dip pipe can be obtained.
The present invention has the advantages that outsourcing flame retardant coating of the present invention is formed using upper and lower two parts composite casting, upper part is resistance to The castable raw material that fiery cast bed of material does not contact molten steel part mainly uses corundum reclaimed materials, so that manufacturing cost is able to greatly It reduces to width, further increases cost performance, and refractory material resources problem in short supply has been effectively relieved；Its underpart refractory casting The bed of material is that the castable of contact molten steel part mainly uses sintered microporous corundum aggregate, internal to have a large amount of silent micro- gas Hole effectively prevents the extension of crackle, can further improve the thermal shock resistance of prepared dip pipe, so that RH dip pipe Actual life improves 60~80%.
Detailed description of the invention
Fig. 1 is the application state that composite RH refining furnace dip pipe encasing of the present invention is applied on refining furnace dip pipe Schematic diagram.
In figure, ring flange 1, steel gallbladder ontology 2, inner core flame retardant coating 4, gap gravity flow bed of material 5, outsourcing flame retardant coating 6 (wherein: on Portion refractory casting bed of material 6a, lower part refractory casting bed of material 6b), molten steel 7.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Embodiment 1:
As shown in Figure 1, composite RH refining furnace dip pipe encasing of the invention, setting is tied in a tubular form in the dip pipe 2 outside of steel gallbladder ontology of structure, forms outsourcing flame retardant coating 6 using integrated poured structure, outsourcing flame retardant coating 6 is by exposed aerial Top refractory casting bed of material 6a and the lower part refractory casting bed of material 6b being immersed in molten steel 7 are composed；In 2 inside of steel gallbladder ontology It is provided with to be formed to fill between inner core flame retardant coating 4, with 2 inner wall of steel gallbladder ontology using preform structure and has the gap gravity flow bed of material 5, The ring flange 1 being connected with vacuum tank is provided at the top of steel gallbladder ontology 2.
The top refractory casting bed of material 6a of above-mentioned outsourcing flame retardant coating 6 is brilliant using the corundum point prepared based on corundum reclaimed materials Stone matter castable, wherein each component weight percent are as follows:
Corundum reclaimed materials 53%；
Sintering plate corundum aggregate 16.9%；
Fine powder 16.85%；
Micro mist 9%；
Bonding agent 3%；
Water-reducing agent 0.1%；
Organic explosion-proof fiber 0.15%；
Stainless steel fibre 1.0%；
Lower part refractory casting bed of material 6b using the corundum spinel castable prepared based on sintered microporous corundum aggregate, Middle each component weight percent are as follows:
Sintered microporous corundum aggregate 36%；
Corundum aggregate 32% containing spinelle；
Fine powder 9.9%；
Micro mist 14.85%；
Bonding agent 5%；
Water-reducing agent 0.1%；
Organic explosion-proof fiber 0.15%；
Stainless steel fibre 2.0%；
The corundum reclaimed materials that top refractory casting bed of material 6a is used for the carbon-free prefabricated component of rear ladle corundum, with rear steel Packet corundum collector nozzle, with rear ladle corundum pocket block, with one of rear ladle corundum air supply brick brick cup or a variety of Mixture, entirety partial size≤12mm；With the rear carbon-free prefabricated component of ladle corundum successively by sorting, removing slag, be crushed, Qiang Ci Except iron and screening process handle to obtain, wherein Al2O3Weight content >=97.5%, CaO weight content≤1.0%, Fe2O3Weight Content≤0.8%.Corundum reclaimed materials is divided by particle size: 8mm < partial size≤12mm, 5mm < partial size≤8mm, 3mm < Diameter≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight in corundum reclaimed materials Percentage is successively are as follows: 18%, 32%, 18%, 17% and 15%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a is used is divided by particle size: 1mm < partial size≤3mm With 0mm < partial size≤gradation of 1mm two, each grade fits over the weight percent in sintering plate corundum aggregate successively are as follows: 50% With 50%.
The Al in sintered microporous corundum aggregate that lower part refractory casting bed of material 6b is used2O3Content >=99.5%, bulk density For 3.0~3.3g/cm3, closed porosity >=10%, average pore size≤0.5 μm, entirety partial size≤18mm inside particle.Sintering Micropore corundum aggregate is divided by particle size: 12mm < partial size≤18mm, 7mm < partial size≤12mm, 3mm < partial size≤7mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight percent of sintered microporous corundum aggregate Successively are as follows: 18%, 32%, 18%, 17% and 15%.
The Al in the corundum aggregate containing spinelle that lower part refractory casting bed of material 6b is used2O3Content >=95%, content of MgO >=3%, Spinel content >=10%, entirety partial size≤5mm.Corundum aggregate containing spinelle is divided by particle size: 3mm < Partial size≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm tri-, each grade fit over the corundum aggregate containing spinelle In weight percent successively are as follows: 28%, 44% and 28%.
Simultaneously:
Synthesis partial size≤0.088mm of fine powder, and fine powder is mixed by component A and B component, component A in the present embodiment For fused white corundum, B component is aluminum-spinel, and the weight ratio of component A and B component is 1~2: 1；
Micro mist is by SiO2Micro mist and active alpha-Al2O3Micro mist mixes, SiO2The SiO of micro mist2Content >=92%, partial size≤ 5μm；Active alpha-Al2O3α-the Al of micro mist2O3Content >=99%, partial size≤10 μm.SiO in the present embodiment2Micro mist and active alpha- Al2O3The mixed weight ratio of micro mist is 1: 10.
Bonding agent uses hydrated alumina in the present embodiment, and water-reducing agent uses sodium tripolyphosphate；
Embodiment 2:
As shown in Figure 1, the outsourcing flame retardant coating 6 in the present embodiment is in the same manner as in Example 1, top refractory casting bed of material 6a It is the corundum spinel castable prepared based on corundum reclaimed materials, the difference is that wherein each component weight percent Are as follows:
Corundum reclaimed materials 45%；
Sintering plate corundum aggregate 24.8%；
Fine powder 9.85%；
Micro mist 13%；
Bonding agent 5%；
Water-reducing agent 0.2%；
Organic explosion-proof fiber 0.15%；
Stainless steel fibre 2.0%；
Lower part refractory casting bed of material 6b is also the corundum spinel casting prepared based on sintered microporous corundum aggregate Material, the difference is that wherein each component weight percent are as follows:
Sintered microporous corundum aggregate 40%；
Corundum aggregate 29.75% containing spinelle；
Fine powder 9.9%；
Micro mist 13.5%；
Bonding agent 5%；
Water-reducing agent 0.25%；
Organic explosion-proof fiber 0.1%；
Stainless steel fibre 1.5%；
The corundum reclaimed materials that top refractory casting bed of material 6a is used for the carbon-free prefabricated component of rear ladle corundum, with rear steel Packet corundum collector nozzle, with rear ladle corundum pocket block, with one of rear ladle corundum air supply brick brick cup or a variety of Mixture, entirety partial size≤12mm；With the rear carbon-free prefabricated component of ladle corundum successively by sorting, removing slag, be crushed, Qiang Ci Except iron and screening process handle to obtain, wherein Al2O3Weight content >=97.5%, CaO weight content≤1.0%, Fe2O3Weight Content≤0.8%.Corundum reclaimed materials is divided by particle size: 8mm < partial size≤12mm, 5mm < partial size≤8mm, 3mm < Diameter≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight in corundum reclaimed materials Percentage is successively are as follows: 22%, 28%, 22%, 13% and 15%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a is used is divided by particle size: 1mm < partial size≤3mm With 0mm < partial size≤gradation of 1mm two, each grade fits over the weight percent in sintering plate corundum aggregate successively are as follows: 60% With 40%.
The Al in sintered microporous corundum aggregate that lower part refractory casting bed of material 6b is used2O3Content >=99.5%, bulk density For 3.0~3.3g/cm3, closed porosity >=10%, average pore size≤0.5 μm, entirety partial size≤18mm inside particle.Sintering Micropore corundum aggregate is divided by particle size: 12mm < partial size≤18mm, 7mm < partial size≤12mm, 3mm < partial size≤7mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight percent of sintered microporous corundum aggregate Successively are as follows: 22%, 28%, 22%, 13% and 15%.
The Al in the corundum aggregate containing spinelle that lower part refractory casting bed of material 6b is used2O3Content >=95%, content of MgO >=3%, Spinel content >=10%, entirety partial size≤5mm.Corundum aggregate containing spinelle is divided by particle size: 3mm < Partial size≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm tri-, each grade fit over the corundum aggregate containing spinelle In weight percent successively are as follows: 32%, 36% and 32%.
Simultaneously:
Synthesis partial size≤0.088mm of fine powder, and fine powder is mixed by component A and B component, component A in the present embodiment For sintering plate corundum, B component is the fused magnesite of content of MgO >=97%, and the weight ratio of component A and B component is 1: 1；
Micro mist is by SiO2Micro mist and active alpha-Al2O3Micro mist mixes, SiO2The SiO of micro mist2Content >=92%, partial size≤ 5μm；Active alpha-Al2O3α-the Al of micro mist2O3Content >=99%, partial size≤10 μm.SiO in the present embodiment2Micro mist and active alpha- Al2O3The mixed weight ratio of micro mist is 1: 20.
Bonding agent uses pure calcium aluminate cement in the present embodiment, and water-reducing agent uses sodium tripolyphosphate；
Embodiment 3:
As shown in Figure 1, the outsourcing flame retardant coating 6 in the present embodiment is same as Example 1, top refractory casting bed of material 6a is still Using the corundum spinel castable prepared based on corundum reclaimed materials, unlike wherein each component weight percent are as follows:
Corundum reclaimed materials 50%；
Sintering plate corundum aggregate 21.5%；
Fine powder 9.85%；
Micro mist 11.5%；
Bonding agent 6%；
Water-reducing agent 0.5%；
Organic explosion-proof fiber 0.15%；
Stainless steel fibre 0.5%；
Lower part refractory casting bed of material 6b is still using the corundum spinel casting prepared based on sintered microporous corundum aggregate Material, the difference is that wherein each component weight percent are as follows:
Sintered microporous corundum aggregate 40%；
Corundum aggregate 31.7% containing spinelle；
Fine powder 9.9%；
Micro mist 11%；
Bonding agent 6%；
Water-reducing agent 0.3%；
Organic explosion-proof fiber 0.1%；
Stainless steel fibre 1.0%；
The corundum reclaimed materials that top refractory casting bed of material 6a is used for the carbon-free prefabricated component of rear ladle corundum, with rear steel Packet corundum collector nozzle, with rear ladle corundum pocket block, with one of rear ladle corundum air supply brick brick cup or a variety of Mixture, entirety partial size≤12mm；With the rear carbon-free prefabricated component of ladle corundum successively by sorting, removing slag, be crushed, Qiang Ci Except iron and screening process handle to obtain, wherein Al2O3Weight content >=97.5%, CaO weight content≤1.0%, Fe2O3Weight Content≤0.8%.Corundum reclaimed materials is divided by particle size: 8mm < partial size≤12mm, 5mm < partial size≤8mm, 3mm < Diameter≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight in corundum reclaimed materials Percentage is successively are as follows: 20%, 30%, 20%, 15% and 15%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a is used is divided by particle size: 1mm < partial size≤3mm With 0mm < partial size≤gradation of 1mm two, each grade fits over the weight percent in sintering plate corundum aggregate successively are as follows: 55% With 45%.
The Al in sintered microporous corundum aggregate that lower part refractory casting bed of material 6b is used2O3Content >=99.5%, bulk density For 3.0~3.3g/cm3, closed porosity >=10%, average pore size≤0.5 μm, entirety partial size≤18mm inside particle.Sintering Micropore corundum aggregate is divided by particle size: 12mm < partial size≤18mm, 7mm < partial size≤12mm, 3mm < partial size≤7mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight percent of sintered microporous corundum aggregate Successively are as follows: 20%, 30%, 20%, 15% and 15%.
The Al in the corundum aggregate containing spinelle that lower part refractory casting bed of material 6b is used2O3Content >=95%, content of MgO >=3%, Spinel content >=10%, entirety partial size≤5mm.Corundum aggregate containing spinelle is divided by particle size: 3mm < Partial size≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm tri-, each grade fit over the corundum aggregate containing spinelle In weight percent successively are as follows: 30%, 40% and 30%.
Simultaneously:
Synthesis partial size≤0.088mm of fine powder, and fine powder is mixed by component A and B component, component A in the present embodiment For fused white corundum, B component is the fused magnesite of content of MgO >=97%, and the weight ratio of component A and B component is 1: 1.5；
Micro mist is by SiO2Micro mist and active alpha-Al2O3Micro mist mixes, SiO2The SiO of micro mist2Content >=92%, partial size≤ 5μm；Active alpha-Al2O3α-the Al of micro mist2O3Content >=99%, partial size≤10 μm.SiO in the present embodiment2Micro mist and active alpha- Al2O3The mixed weight ratio of micro mist is 1: 15.
Mixture of the bonding agent using pure calcium aluminate cement and hydrated alumina in the present embodiment, mixed proportion 2: 1, Water-reducing agent uses the polycarboxylic acids dehydragent ADS1/ADW1 of Qingdao An Mai company production；
Embodiment 4:
As shown in Figure 1, the outsourcing flame retardant coating 6 in the present embodiment is same as Example 1, top refractory casting bed of material 6a is same It is the corundum spinel castable prepared based on corundum reclaimed materials, the difference is that wherein each component weight percent Are as follows:
Corundum reclaimed materials 48%；
Sintering plate corundum aggregate 21.85%；
Fine powder 14.88%；
Micro mist 9%；
Bonding agent 5%；
Water-reducing agent 0.15%；
Organic explosion-proof fiber 0.12%；
Stainless steel fibre 1.0%；
Lower part refractory casting bed of material 6b is equally that the corundum spinel prepared based on sintered microporous corundum aggregate is poured Material feeding, the difference is that wherein each component weight percent are as follows:
Sintered microporous corundum aggregate 38%；
Corundum aggregate 31.65% containing spinelle；
Fine powder 14.9%；
Micro mist 8%；
Bonding agent 5%；
Water-reducing agent 0.35%；
Organic explosion-proof fiber 0.1%；
Stainless steel fibre 2.0%；
The corundum reclaimed materials that top refractory casting bed of material 6a is used for the carbon-free prefabricated component of rear ladle corundum, with rear steel Packet corundum collector nozzle, with rear ladle corundum pocket block, with one of rear ladle corundum air supply brick brick cup or a variety of Mixture, entirety partial size≤12mm；With the rear carbon-free prefabricated component of ladle corundum successively by sorting, removing slag, be crushed, Qiang Ci Except iron and screening process handle to obtain, wherein Al2O3Weight content >=97.5%, CaO weight content≤1.0%, Fe2O3Weight Content≤0.8%.Corundum reclaimed materials is divided by particle size: 8mm < partial size≤12mm, 5mm < partial size≤8mm, 3mm < Diameter≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight in corundum reclaimed materials Percentage is successively are as follows: 19%, 31%, 19%, 17% and 14%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a is used is divided by particle size: 1mm < partial size≤3mm With 0mm < partial size≤gradation of 1mm two, each grade fits over the weight percent in sintering plate corundum aggregate successively are as follows: 52% With 48%.
The Al in sintered microporous corundum aggregate that lower part refractory casting bed of material 6b is used2O3Content >=99.5%, bulk density For 3.0~3.3g/cm3, closed porosity >=10%, average pore size≤0.5 μm, entirety partial size≤18mm inside particle.Sintering Micropore corundum aggregate is divided by particle size: 12mm < partial size≤18mm, 7mm < partial size≤12mm, 3mm < partial size≤7mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight percent of sintered microporous corundum aggregate Successively are as follows: 19%, 31%, 19%, 17% and 14%.
The Al in the corundum aggregate containing spinelle that lower part refractory casting bed of material 6b is used2O3Content >=95%, content of MgO >=3%, Spinel content >=10%, entirety partial size≤5mm.Corundum aggregate containing spinelle is divided by particle size: 3mm < Partial size≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm tri-, each grade fit over the corundum aggregate containing spinelle In weight percent successively are as follows: 29%, 40% and 31%.
Simultaneously:
Synthesis partial size≤0.088mm of fine powder, and fine powder is mixed by component A and B component, component A in the present embodiment For fused white corundum, B component is the fused magnesite of content of MgO >=97%, and the weight ratio of component A and B component is 1: 1；
Micro mist is by SiO2Micro mist and active alpha-Al2O3Micro mist mixes, SiO2The SiO of micro mist2Content >=92%, partial size≤ 5μm；Active alpha-Al2O3α-the Al of micro mist2O3Content >=99%, partial size≤10 μm.SiO in the present embodiment2Micro mist and active alpha- Al2O3The mixed weight ratio of micro mist is 1: 18.
Bonding agent uses pure calcium aluminate cement in the present embodiment, and water-reducing agent is using the mixed of sodium tripolyphosphate and calgon Close object, mixed proportion 1: 1；
Embodiment 5:
As shown in Figure 1, the outsourcing flame retardant coating 6 in the present embodiment is same as Example 1, top refractory casting bed of material 6a is still It is the corundum spinel castable prepared based on corundum reclaimed materials, the difference is that wherein each component weight percent Are as follows:
Corundum reclaimed materials 47%；
Sintering plate corundum aggregate 23.6%；
Fine powder 11.85%；
Micro mist 12.7%；
Bonding agent 4%；
Water-reducing agent 0.4%；
Organic explosion-proof fiber 0.15%；
Stainless steel fibre 0.3%；
Lower part refractory casting bed of material 6b is still to be poured using the corundum spinel prepared based on sintered microporous corundum aggregate Material feeding, the difference is that wherein each component weight percent are as follows:
Sintered microporous corundum aggregate 42%；
Corundum aggregate 29.8% containing spinelle；
Fine powder 11.85%；
Micro mist 10%；
Bonding agent 4%；
Water-reducing agent 0.2%；
Organic explosion-proof fiber 0.15%；
Stainless steel fibre 2.0%；
The corundum reclaimed materials that top refractory casting bed of material 6a is used for the carbon-free prefabricated component of rear ladle corundum, with rear steel Packet corundum collector nozzle, with rear ladle corundum pocket block, with one of rear ladle corundum air supply brick brick cup or a variety of Mixture, entirety partial size≤12mm；With the rear carbon-free prefabricated component of ladle corundum successively by sorting, removing slag, be crushed, Qiang Ci Except iron and screening process handle to obtain, wherein Al2O3Weight content >=97.5%, CaO weight content≤1.0%, Fe2O3Weight Content≤0.8%.Corundum reclaimed materials is divided by particle size: 8mm < partial size≤12mm, 5mm < partial size≤8mm, 3mm < Diameter≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight in corundum reclaimed materials Percentage is successively are as follows: 21%, 29%, 21%, 15% and 14%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a is used is divided by particle size: 1mm < partial size≤3mm With 0mm < partial size≤gradation of 1mm two, each grade fits over the weight percent in sintering plate corundum aggregate successively are as follows: 58% With 42%.
The Al in sintered microporous corundum aggregate that lower part refractory casting bed of material 6b is used2O3Content >=99.5%, bulk density For 3.0~3.3g/cm3, closed porosity >=10%, average pore size≤0.5 μm, entirety partial size≤18mm inside particle.Sintering Micropore corundum aggregate is divided by particle size: 12mm < partial size≤18mm, 7mm < partial size≤12mm, 3mm < partial size≤7mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight percent of sintered microporous corundum aggregate Successively are as follows: 21%, 29%, 21%, 15% and 14%.
The Al in the corundum aggregate containing spinelle that lower part refractory casting bed of material 6b is used2O3Content >=95%, content of MgO >=3%, Spinel content >=10%, entirety partial size≤5mm.Corundum aggregate containing spinelle is divided by particle size: 3mm < Partial size≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤gradation of 1mm tri-, each grade fit over the corundum aggregate containing spinelle In weight percent successively are as follows: 30%, 40% and 30%.
Simultaneously:
Synthesis partial size≤0.088mm of fine powder, and fine powder is mixed by component A and B component, component A in the present embodiment For sintering plate corundum, B component is aluminum-spinel, and the weight ratio of component A and B component is 1: 1.8；
Micro mist is by SiO2Micro mist and active alpha-Al2O3Micro mist mixes, SiO2The SiO of micro mist2Content >=92%, partial size≤ 5μm；Active alpha-Al2O3α-the Al of micro mist2O3Content >=99%, partial size≤10 μm.SiO in the present embodiment2Micro mist and active alpha- Al2O3The mixed weight ratio of micro mist is 1: 16.
Bonding agent uses pure hydrated alumina in the present embodiment, and water-reducing agent uses calgon；
The moulding process of the composite RH refining furnace dip pipe encasing of above-described embodiment 1~5, including following step It is rapid:
1, it puts into after the raw materials used weighing of top refractory casting bed of material 6a in forced stirrer and stirs according to weight percent 2~3min is mixed, uniformly rear discharging to be mixed is spare；Equally, according to weight percent by original used in the refractory casting bed of material 6b of lower part Expect after weighing, put into and stir 2~3min in forced stirrer, uniformly rear discharging to be mixed is spare；
2, ring flange 1 is installed in advance at 2 top of the steel gallbladder ontology of tubular structure, and pacify in advance in 2 inside of steel gallbladder ontology It fills or pours and be poured in inner core flame retardant coating 4, its entirety is placed on working plate；Then, by the peripheral castable refractory tire of brush oil Film is fixed on 2 periphery of steel gallbladder ontology, and guarantees the distance between steel gallbladder ontology 2 and peripheral castable refractory fetal membrane uniformly；
3, the steel gallbladder ontology 2 for adjusting distance and peripheral castable refractory fetal membrane are inverted are placed to shaking platform together On；
4, add water and stir top refractory casting bed of material 6a is raw materials used, amount of water be raw materials used total weight 3.8~ 4.2%, 3~5min of mixing time pour into the gap between steel gallbladder ontology 2 and peripheral castable refractory fetal membrane after mixing evenly In, it opens shaking platform and is vibrated, while being inserted into vibrating head in castable and strengthening vibration；
5, when top, refractory casting bed of material 6a stops when being poured into setting height pouring into, while by the lower part refractory casting bed of material 6b is raw materials used to be added water and stirred, and amount of water is 4.0~4.2%, 3~5min of mixing time of raw materials used total weight, and stirring is equal Continue to pour into the gap between steel gallbladder ontology 2 and peripheral castable refractory fetal membrane after even, and is inserted into vibrating head in castable Strengthen vibration, until the bleeding of castable surface, forms outsourcing flame retardant coating 6；
6, maintenance demoulding is carried out to the 2 molding outsourcing flame retardant coating 6 in outside of steel gallbladder ontology, when room temperature is lower than 15 DEG C, at least Natural curing 48h is demoulded again；When room temperature is higher than 15 DEG C, at least natural curing demoulds again for 24 hours；
7, continue natural curing 240h or more after demoulding to toast again；In baking process, first with the liter of 10~12 DEG C/h Warm speed is raised to 110 DEG C from room temperature, keeps the temperature for 24 hours at 110 DEG C；250 DEG C are warming up to the heating rate of 9~10 DEG C/h again, It is kept the temperature for 24 hours at 250 DEG C；450 DEG C are warming up to the heating rate of 8~9 DEG C/h again, is ceased fire after keeping the temperature 12h at 450 DEG C, it is natural Cooling, cooling time is 15~20h, and RH refining furnace dip pipe can be obtained.
Finally it is pointed out that above embodiments are only the more representational examples of the present invention.It is clear that the invention is not restricted to Above-described embodiment, acceptable there are many deformations.Any letter made to the above embodiment according to the technical essence of the invention Single modification, equivalent variations and modification, are considered as belonging to the scope of protection of the present invention.

Claims (8)

1. the steel gallbladder ontology (2) of the dip pipe in tubular construction is arranged in a kind of composite RH refining furnace dip pipe encasing Outside forms outsourcing flame retardant coating (6) using integrated poured structure, it is characterised in that:
The outsourcing flame retardant coating (6) is by the exposed aerial top refractory casting bed of material (6a) and is immersed in molten steel (7) The lower part refractory casting bed of material (6b) is composed；
The top refractory casting bed of material (6a) is the corundum spinel castable prepared based on corundum reclaimed materials, Middle each component weight percent are as follows:
The lower part refractory casting bed of material (6b) is the corundum spinel casting prepared based on sintered microporous corundum aggregate Expect, wherein each component weight percent are as follows:
Simultaneously:
Partial size≤0.088mm of the fine powder, and the fine powder is mixed by component A and B component, the component A is electric smelting Any one in white fused alumina and sintering plate corundum, the B component are the electric-melting magnesium of aluminum-spinel, content of MgO >=97% Any one in sand, the weight ratio of the component A and B component are 1~2: 1；
Partial size≤20 μm of the micro mist, and the micro mist is by SiO2Micro mist and active alpha-Al2O3Micro mist mixes, the SiO2 Micro mist and active alpha-Al2O3The weight ratio of micro mist is 1: 10~20；
The moulding process of the composite RH refining furnace dip pipe encasing, comprising the following steps:
1) it is put into forced stirrer according to the weight percent by after top the refractory casting bed of material (6a) raw materials used weighing 2~3min is stirred, uniformly rear discharging to be mixed is spare；Equally, according to the weight percent by the lower part refractory casting bed of material It after (6b) raw materials used weighing, puts into and stirs 2~3min in forced stirrer, uniformly rear discharging to be mixed is spare；
2) it is installed ring flange (1) in advance at the top of the steel gallbladder ontology (2) of the tubular structure, and on the inside of steel gallbladder ontology (2) It installs or pours in advance and be poured in inner core flame retardant coating (4), its entirety is placed on working plate；Then, by the peripheral fire resisting of brush oil Castable fetal membrane is fixed on steel gallbladder ontology (2) periphery, and guarantees between steel gallbladder ontology (2) and peripheral castable refractory fetal membrane Distance it is uniform；
3) the steel gallbladder ontology (2) for adjusting distance and peripheral castable refractory fetal membrane are inverted are placed on shaking platform together；
4) add water and stir the top refractory casting bed of material (6a) is raw materials used, amount of water be raw materials used total weight 3.8~ 4.2%, 3~5min of mixing time pour into the gap between steel gallbladder ontology (2) and peripheral castable refractory fetal membrane after mixing evenly In, it opens shaking platform and is vibrated, while being inserted into vibrating head in castable and strengthening vibration；
5) stop pouring into when the top refractory casting bed of material (6a) is poured into setting height, while by the lower part refractory casting bed of material (6b) is raw materials used to be added water and stirred, and amount of water is 4.0~4.2%, 3~5min of mixing time of raw materials used total weight, stirring Continue to pour into the gap between steel gallbladder ontology (2) and peripheral castable refractory fetal membrane after uniformly, and is inserted into vibration in castable Dynamic stick strengthens vibration, until the bleeding of castable surface, is formed outsourcing flame retardant coating (6)；
6) maintenance demoulding is carried out to outsourcing flame retardant coating (6) molding on the outside of steel gallbladder ontology (2), when room temperature is lower than 15 DEG C, at least Natural curing 48h is demoulded again；When room temperature is higher than 15 DEG C, at least natural curing demoulds again for 24 hours；
7) continue natural curing 240h or more after demoulding to toast again；In baking process, first with the heating speed of 10~12 DEG C/h Degree is raised to 110 DEG C from room temperature, and 23~25h is kept the temperature at 110 DEG C；250 DEG C are warming up to the heating rate of 9~10 DEG C/h again, 23~25h is kept the temperature at 250 DEG C；450 DEG C are warming up to the heating rate of 8~9 DEG C/h again, is stopped after keeping the temperature 11~13h at 450 DEG C Fire, natural cooling, cooling time be 12~for 24 hours, RH refining furnace dip pipe can be obtained.
2. composite RH refining furnace dip pipe encasing according to claim 1, it is characterised in that: the corundum returns Rewinding is divided by particle size: 8mm < partial size≤12mm, 5mm < partial size≤8mm, 3mm < partial size≤5mm, 1mm < partial size≤ 3mm the and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight percent in corundum reclaimed materials successively are as follows: 18~ 22%, 28~32%, 18~22%, 13~17% and 13~15%.
3. composite RH refining furnace dip pipe encasing according to claim 1, it is characterised in that: the top fire resisting The sintering plate corundum aggregate that cast bed of material (6a) uses is divided by particle size: 1mm < partial size≤3mm and 0mm < partial size≤ Two gradations of 1mm, each grade fit over the weight percent in sintering plate corundum aggregate successively are as follows: 50~60% and 40~ 50%.
4. composite RH refining furnace dip pipe encasing according to claim 1, it is characterised in that: described sintered microporous Corundum aggregate is divided by particle size: 12mm < partial size≤18mm, 7mm < partial size≤12mm, 3mm < partial size≤7mm, 1mm < Partial size≤3mm and 0mm < partial size≤gradation of 1mm five, each grade fit over the weight percent of sintered microporous corundum aggregate successively Are as follows: 18~22%, 28~32%, 18~22%, 13~17% and 13~15%.
5. composite RH refining furnace dip pipe encasing according to claim 1, it is characterised in that: described to contain spinelle Corundum aggregate be divided by particle size: 3mm < partial size≤5mm, 1mm < partial size≤3mm and 0mm < partial size≤grade of 1mm tri- Match, each grade fits over the weight percent in the corundum aggregate containing spinelle successively are as follows: 28~32%, 36~44% and 28~ 32%.
6. composite RH refining furnace dip pipe encasing according to claim 1, it is characterised in that: the micro mist mixes It is combined in part, SiO2The SiO of micro mist2Content >=92%, partial size≤5 μm；Active alpha-Al2O3α-the Al of micro mist2O3Content >=99%, Partial size≤10 μm.
7. composite RH refining furnace dip pipe encasing according to claim 1, it is characterised in that: the bonding agent is The mixture of one or both of pure calcium aluminate cement, hydrated alumina arbitrary proportion.
8. composite RH refining furnace dip pipe encasing according to claim 1, it is characterised in that: the water-reducing agent is The mixture of one of sodium tripolyphosphate, calgon or arbitrary proportion.
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CN115340370B (en) * 2022-08-17 2023-07-04 江苏锦耐新材料科技有限公司 High-alumina self-flowing castable based on used refractory material and preparation method thereof
CN115650737A (en) * 2022-08-29 2023-01-31 广西威林高温功能材料有限责任公司 Refractory castable and application thereof
CN115504772A (en) * 2022-09-19 2022-12-23 郑州荣盛窑炉耐火材料有限公司 Castable for RH furnace dip pipe and preparation method thereof

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