CN105565830A - Composite material RH finery dipping pipe outer wrapping body and molding process thereof - Google Patents
Composite material RH finery dipping pipe outer wrapping body and molding process thereof Download PDFInfo
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Abstract
The invention discloses a composite material RH finery dipping pipe outer wrapping body and a molding process thereof. The outer wrapping body is arranged at the outer side of a steel cylinder in a tubular structure of the dipping pipe, and an outer wrapping refractory layer is formed by adopting an integral pouring structure and consists of an upper part refractory pouring material layer exposed in air and a lower part refractory pouring material layer immersed in molten steel; the upper part refractory pouring material layer is made of a corundum spinel pouring material taking corundum reclaimed material as a main material, and percents by weight of respective components are as follows: 45-53 percent of corundum reclaimed material, 17-28 percent of sintered tabular corundum aggregate, 10-17 percent of fine powder, 8-15 percent of micropowder, 3-7 percent of binder, 0.1-0.5 percent of water reducing agent, 0.05-0.15 percent of organic antiexplosion fiber and 0.5-2.0 percent of stainless steel fiber; the lower part refractory pouring material layer is made of a corundum spinel pouring material taking sintered micropore corundum aggregate as a main material, and percents by weight of respective components are as follows: 35-43 percent of sintered micropore corundum aggregate, 25-33 percent of corundum aggregate containing spinel, 10-17 percent of fine powder, 8-15 percent of micropowder, 3-7 percent of binder, 0.1-0.5 percent of water reducing agent, 0.05-0.15 percent of organic antiexplosion fiber and 0.5-2.0 percent of stainless steel fiber.
Description
Technical field
The present invention relates to Refractory For Steelmaking technical field, refer to a kind of composite RH refining furnace soaking tub encasing and moulding process thereof particularly.
Background technology
One of indispensable visual plant of high quality steel produced in external refining process by RH refining furnace.Soaking tub is as the passage passing in and out molten steel in RH refining furnace, and subject the effects such as molten steel washes away at a high speed, the violent erosion of extremely cold very hot and slag, is the key link in restriction RH refining furnace life-span.
The primary structure of traditional RH soaking tub is: internal layer uses the electric smelting of leaching salt to build by laying bricks or stones in conjunction with magnesia chrome brick layering, and outer employing amorphous refractory casting is middle using steel courage as main body load larrying member; Fill with self-flowing material between internal layer and steel courage, be usually welded with a large amount of Y shapes or V-arrangement anchoring piece in the outside of steel courage with fixing mould material.
The factor affecting RH soaking tub work-ing life mainly comprises: the material of mould material, pouring type, soaking tub structure and the shape of steel courage thereof and the repairing treatment etc. of user's use procedure outside soaking tub.Under normal circumstances, because soaking tub bottom long period of soaking is in molten steel, outside flame retardant coating top and the bottom are heated uneven, often occur that bottom refractory materials bursts situations such as coming off.At present, it is the pour mass adopting same refractory material casting outside the most of RH soaking tub of steel mill, but due to increasing price of raw materials, product cost improves, many producers bring into use the original raw material of low-grade raw material substitution to carry out the production supply of material, the work-ing life of the RH soaking tub that this also directly causes can not improve rapidly, even occurs decline situation.
Summary of the invention
The object of the present invention is to provide a kind of long service life, low cost of manufacture, easy construction, the composite RH refining furnace soaking tub encasing of economic environmental protection and moulding process thereof.
For achieving the above object, composite RH refining furnace soaking tub encasing designed by the present invention, be arranged on outside this soaking tub steel courage body in tubular construction, adopt integrated poured structure to form outsourcing flame retardant coating, its special character is: described outsourcing flame retardant coating is combined by the exposed aerial top refractory casting bed of material and the bottom refractory casting bed of material be immersed in molten steel;
Described top refractory casting bed of material employing corundum reclaimed materials is the corundum spinel mould material of main preparation, and wherein each component weight percent is:
The described bottom refractory casting bed of material adopts sintered microporous corundum aggregate to be the corundum spinel mould material of main preparation, and wherein each component weight percent is:
Simultaneously:
Particle diameter≤the 0.088mm of described fine powder, and described fine powder is mixed by component A and B component, described component A is any one in fused white corundum and sintering plate corundum, described B component is any one in the electrosmelted magnesite clinker of aluminum-spinel, content of MgO >=97%, and the weight ratio of described component A and B component is 1 ~ 2: 1;
Particle diameter≤20 μm of described micro mist, and described micro mist is by SiO
2micro mist and active alpha-Al
2o
3micro mist mixes, described SiO
2micro mist and active alpha-Al
2o
3the weight ratio of micro mist is 1: 10 ~ 20.
Further, the corundum reclaimed materials that the described top refractory casting bed of material adopts is with the carbon-free prefabricated component of rear ladle corundum, with the mouth of a river under rear ladle corundum, with rear ladle corundum pocket block, with one or more the mixture in rear ladle corundum air supply brick brick cup, its overall particle diameter≤12mm; Described with the carbon-free prefabricated component of rear ladle corundum successively through choose, remove slag, broken, strong magnetic deironing and sieve operation process and obtain, wherein Al
2o
3weight content>=97.5%, CaO weight content≤1.0%, Fe
2o
3weight content≤0.8%.
Again further, described corundum reclaimed materials is divided into by size: 8mm < particle diameter≤12mm, 5mm < particle diameter≤8mm, 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits in corundum reclaimed materials is followed successively by: 18 ~ 22%, 28 ~ 32%, 18 ~ 22%, 13 ~ 17% and 13 ~ 15%.
Further, the sintering plate corundum aggregate that the described top refractory casting bed of material adopts is divided into by size: 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm two gratings, the weight percent that each grade fits in sintering plate corundum aggregate is followed successively by: 50 ~ 60% and 40 ~ 50%.
Further, the described bottom refractory casting bed of material adopt sintered microporous corundum aggregate in Al
2o
3content>=99.5%, volume density are 3.0 ~ 3.3g/cm
3, closed porosity>=10%, granule interior mean pore size≤0.5 μm, overall particle diameter≤18mm.
Again further, described sintered microporous corundum aggregate is divided into by size: 12mm < particle diameter≤18mm, 7mm < particle diameter≤12mm, 3mm < particle diameter≤7mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits over sintered microporous corundum aggregate is followed successively by: 18 ~ 22%, 28 ~ 32%, 18 ~ 22%, 13 ~ 17% and 13 ~ 15%.
Further, the Al contained in the corundum aggregate of spinel that the described bottom refractory casting bed of material adopts
2o
3content>=95%, content of MgO>=3%, Spinel content>=10%, overall particle diameter≤5mm.
Again further, the described corundum aggregate containing spinel is divided into by size: 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm tri-gratings, each grade fits over and be followed successively by containing the weight percent in the corundum aggregate of spinel: 28 ~ 32%, 36 ~ 44% and 28 ~ 32%.
Further, in the mixed composition of described micro mist, SiO
2the SiO of micro mist
2content>=92%, particle diameter≤5 μm; Active alpha-Al
2o
3α-the Al of micro mist
2o
3content>=99%, particle diameter≤10 μm.
Further, described bonding agent is the mixture of one or both arbitrary proportions in pure calcium aluminate cement, hydrated aluminum oxide.
Further, described water reducer is the mixture of one or more arbitrary proportions in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, polycarboxylic acids dehydragent ADS1/ADW1.
For a moulding process for above-mentioned composite RH refining furnace soaking tub encasing, comprise the following steps:
1) according to described weight percent by after the raw materials used weighing of the top refractory casting bed of material, drop in forced stirrer and stir 2 ~ 3min, to be mixed evenly after discharging for subsequent use; Equally, according to described weight percent by after the raw materials used weighing of the bottom refractory casting bed of material, drop in forced stirrer and stir 2 ~ 3min, evenly rear discharging to be mixed is for subsequent use;
2) install ring flange in advance in the steel courage bodies top of described tubular structure, and install in advance inside steel courage body or poured into a mould inner core flame retardant coating, its entirety is placed on working plate; Then, the peripheral refractory castable fetal membrane of brush oil is fixed on steel courage body peripheral, and ensures that the distance between steel courage body and peripheral refractory castable fetal membrane is even;
3) the steel courage body adjusting distance is inverted together with peripheral refractory castable fetal membrane is placed on shaking platform;
4) by raw materials used for the top refractory casting bed of material stirring that adds water, amount of water is 3.8 ~ 4.2% of raw materials used gross weight, churning time 3 ~ 5min, pour in the gap between steel courage body and peripheral refractory castable fetal membrane after stirring, open shaking platform to vibrate, in mould material, insert vibrating head strengthening vibration simultaneously;
5) stop when the top refractory casting bed of material is poured into setting height pouring into, simultaneously by raw materials used for the bottom refractory casting bed of material stirring that adds water, amount of water is 4.0 ~ 4.2% of raw materials used gross weight, churning time 3 ~ 5min, continue after stirring to pour in the gap between steel courage body and peripheral refractory castable fetal membrane, and in mould material, insert vibrating head strengthening vibration, till mould material surface bleeding, form outsourcing flame retardant coating;
6) the maintenance demoulding is carried out to outsourcing flame retardant coating shaping outside steel courage body, when room temperature is lower than 15 DEG C, at least natural curing 48h demoulding again; When room temperature is higher than 15 DEG C, at least natural curing 24h demoulding again;
7) the above rebake of natural curing 240h is continued after the demoulding; In bake process, be first raised to 110 DEG C with the heat-up rate of 10 ~ 12 DEG C/h from room temperature, 110 DEG C time, be incubated 23 ~ 25h; Be warmed up to 250 DEG C with the heat-up rate of 9 ~ 10 DEG C/h again, 250 DEG C time, be incubated 23 ~ 25h; Be warmed up to 450 DEG C with the heat-up rate of 8 ~ 9 DEG C/h again, cease fire be incubated 11 ~ 13h 450 DEG C time after, naturally cooling, cooling time is 12 ~ 24h, can obtain RH refining furnace soaking tub.
The invention has the advantages that: outsourcing flame retardant coating of the present invention adopts upper and lower two portions composite casting to form, the mould material raw material that namely its top refractory casting bed of material does not contact molten steel part mainly adopts corundum reclaimed materials, manufacturing cost is reduced significantly, further raising cost performance, and effectively alleviate refractory material resources problem in short supply; The mould material that namely its underpart refractory casting bed of material contacts molten steel part mainly adopts sintered microporous corundum aggregate, its inside has a large amount of micro-pores of remaining silent, effectively prevent the expansion of crackle, can further improve the thermal shock resistance of prepared soaking tub, make improve 60 ~ 80% the actual service life of RH soaking tub.
Accompanying drawing explanation
Fig. 1 is the application state schematic diagram that composite RH refining furnace soaking tub encasing of the present invention is applied on refining furnace soaking tub.
In figure, ring flange 1, steel courage body 2, inner core flame retardant coating 4, the gap gravity flow bed of material 5, outsourcing flame retardant coating 6 (wherein: top refractory casting bed of material 6a, bottom refractory casting bed of material 6b), molten steel 7.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, composite RH refining furnace soaking tub encasing of the present invention, be arranged on outside this soaking tub steel courage body 2 in tubular construction, adopt integrated poured structure to form outsourcing flame retardant coating 6, outsourcing flame retardant coating 6 is combined by exposed aerial top refractory casting bed of material 6a and the bottom refractory casting bed of material 6b be immersed in molten steel 7; Be provided with inside steel courage body 2 and adopt preform structure to form inner core flame retardant coating 4, be filled with gap between itself and steel courage body 2 inwall and flow automatically the bed of material 5, steel courage body 2 top is provided with the ring flange 1 be connected with vacuum tank.
The top refractory casting bed of material 6a employing corundum reclaimed materials of above-mentioned outsourcing flame retardant coating 6 is the corundum spinel mould material of main preparation, and wherein each component weight percent is:
Corundum reclaimed materials 53%;
Sintering plate corundum aggregate 16.9%;
Fine powder 16.85%;
Micro mist 9%;
Bonding agent 3%;
Water reducer 0.1%;
Organic explosion-proof fiber 0.15%;
Stainless Steel Fibre 1.0%;
Bottom refractory casting bed of material 6b adopts sintered microporous corundum aggregate to be the corundum spinel mould material of main preparation, and wherein each component weight percent is:
Sintered microporous corundum aggregate 36%;
Containing the corundum aggregate 32% of spinel;
Fine powder 9.9%;
Micro mist 14.85%;
Bonding agent 5%;
Water reducer 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 adopts is with the carbon-free prefabricated component of rear ladle corundum, with the mouth of a river under rear ladle corundum, with rear ladle corundum pocket block, with one or more the mixture in rear ladle corundum air supply brick brick cup, its overall particle diameter≤12mm; With the carbon-free prefabricated component of rear ladle corundum successively through choose, remove slag, broken, strong magnetic deironing and sieve operation process and obtain, wherein Al
2o
3weight content>=97.5%, CaO weight content≤1.0%, Fe
2o
3weight content≤0.8%.Corundum reclaimed materials is divided into by size: 8mm < particle diameter≤12mm, 5mm < particle diameter≤8mm, 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits in corundum reclaimed materials is followed successively by: 18%, 32%, 18%, 17% and 15%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a adopts is divided into by size: 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm two gratings, the weight percent that each grade fits in sintering plate corundum aggregate is followed successively by: 50% and 50%.
Al in the sintered microporous corundum aggregate that bottom refractory casting bed of material 6b adopts
2o
3content>=99.5%, volume density are 3.0 ~ 3.3g/cm
3, closed porosity>=10%, granule interior mean pore size≤0.5 μm, overall particle diameter≤18mm.Sintered microporous corundum aggregate is divided into by size: 12mm < particle diameter≤18mm, 7mm < particle diameter≤12mm, 3mm < particle diameter≤7mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits over sintered microporous corundum aggregate is followed successively by: 18%, 32%, 18%, 17% and 15%.
The Al contained in the corundum aggregate of spinel of bottom refractory casting bed of material 6b employing
2o
3content>=95%, content of MgO>=3%, Spinel content>=10%, overall particle diameter≤5mm.Corundum aggregate containing spinel is divided into by size: 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm tri-gratings, each grade fits over and be followed successively by containing the weight percent in the corundum aggregate of spinel: 28%, 44% and 28%.
Simultaneously:
Comprehensive particle diameter≤the 0.088mm of fine powder, and fine powder is mixed by component A and B component, in the present embodiment, component A is fused white corundum, and B component is aluminum-spinel, and the weight ratio of component A and B component is 1 ~ 2: 1;
Micro mist is by SiO
2micro mist and active alpha-Al
2o
3micro mist mixes, SiO
2the SiO of micro mist
2content>=92%, particle diameter≤5 μm; Active alpha-Al
2o
3α-the Al of micro mist
2o
3content>=99%, particle diameter≤10 μm.SiO in the present embodiment
2micro mist and active alpha-Al
2o
3the mixed weight ratio of micro mist is 1: 10.
In the present embodiment, bonding agent adopts hydrated aluminum oxide, and water reducer adopts tripoly phosphate sodium STPP;
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, and top refractory casting bed of material 6a adopts corundum reclaimed materials to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Corundum reclaimed materials 45%;
Sintering plate corundum aggregate 24.8%;
Fine powder 9.85%;
Micro mist 13%;
Bonding agent 5%;
Water reducer 0.2%;
Organic explosion-proof fiber 0.15%;
Stainless Steel Fibre 2.0%;
Bottom refractory casting bed of material 6b adopts sintered microporous corundum aggregate to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Sintered microporous corundum aggregate 40%;
Containing the corundum aggregate 29.75% of spinel;
Fine powder 9.9%;
Micro mist 13.5%;
Bonding agent 5%;
Water reducer 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 adopts is with the carbon-free prefabricated component of rear ladle corundum, with the mouth of a river under rear ladle corundum, with rear ladle corundum pocket block, with one or more the mixture in rear ladle corundum air supply brick brick cup, its overall particle diameter≤12mm; With the carbon-free prefabricated component of rear ladle corundum successively through choose, remove slag, broken, strong magnetic deironing and sieve operation process and obtain, wherein Al
2o
3weight content>=97.5%, CaO weight content≤1.0%, Fe
2o
3weight content≤0.8%.Corundum reclaimed materials is divided into by size: 8mm < particle diameter≤12mm, 5mm < particle diameter≤8mm, 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits in corundum reclaimed materials is followed successively by: 22%, 28%, 22%, 13% and 15%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a adopts is divided into by size: 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm two gratings, the weight percent that each grade fits in sintering plate corundum aggregate is followed successively by: 60% and 40%.
Al in the sintered microporous corundum aggregate that bottom refractory casting bed of material 6b adopts
2o
3content>=99.5%, volume density are 3.0 ~ 3.3g/cm
3, closed porosity>=10%, granule interior mean pore size≤0.5 μm, overall particle diameter≤18mm.Sintered microporous corundum aggregate is divided into by size: 12mm < particle diameter≤18mm, 7mm < particle diameter≤12mm, 3mm < particle diameter≤7mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits over sintered microporous corundum aggregate is followed successively by: 22%, 28%, 22%, 13% and 15%.
The Al contained in the corundum aggregate of spinel of bottom refractory casting bed of material 6b employing
2o
3content>=95%, content of MgO>=3%, Spinel content>=10%, overall particle diameter≤5mm.Corundum aggregate containing spinel is divided into by size: 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm tri-gratings, each grade fits over and be followed successively by containing the weight percent in the corundum aggregate of spinel: 32%, 36% and 32%.
Simultaneously:
Comprehensive particle diameter≤the 0.088mm of fine powder, and fine powder is mixed by component A and B component, in the present embodiment, component A is sintering plate corundum, and B component is the electrosmelted magnesite clinker of content of MgO >=97%, and the weight ratio of component A and B component is 1: 1;
Micro mist is by SiO
2micro mist and active alpha-Al
2o
3micro mist mixes, SiO
2the SiO of micro mist
2content>=92%, particle diameter≤5 μm; Active alpha-Al
2o
3α-the Al of micro mist
2o
3content>=99%, particle diameter≤10 μm.SiO in the present embodiment
2micro mist and active alpha-Al
2o
3the mixed weight ratio of micro mist is 1: 20.
In the present embodiment, bonding agent adopts pure calcium aluminate cement, and water reducer adopts tripoly phosphate sodium STPP;
Embodiment 3:
As shown in Figure 1, the outsourcing flame retardant coating 6 in the present embodiment is identical with embodiment 1, and top refractory casting bed of material 6a still adopts corundum reclaimed materials to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Corundum reclaimed materials 50%;
Sintering plate corundum aggregate 21.5%;
Fine powder 9.85%;
Micro mist 11.5%;
Bonding agent 6%;
Water reducer 0.5%;
Organic explosion-proof fiber 0.15%;
Stainless Steel Fibre 0.5%;
Bottom refractory casting bed of material 6b still adopts sintered microporous corundum aggregate to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Sintered microporous corundum aggregate 40%;
Containing the corundum aggregate 31.7% of spinel;
Fine powder 9.9%;
Micro mist 11%;
Bonding agent 6%;
Water reducer 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 adopts is with the carbon-free prefabricated component of rear ladle corundum, with the mouth of a river under rear ladle corundum, with rear ladle corundum pocket block, with one or more the mixture in rear ladle corundum air supply brick brick cup, its overall particle diameter≤12mm; With the carbon-free prefabricated component of rear ladle corundum successively through choose, remove slag, broken, strong magnetic deironing and sieve operation process and obtain, wherein Al
2o
3weight content>=97.5%, CaO weight content≤1.0%, Fe
2o
3weight content≤0.8%.Corundum reclaimed materials is divided into by size: 8mm < particle diameter≤12mm, 5mm < particle diameter≤8mm, 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits in corundum reclaimed materials is followed successively by: 20%, 30%, 20%, 15% and 15%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a adopts is divided into by size: 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm two gratings, the weight percent that each grade fits in sintering plate corundum aggregate is followed successively by: 55% and 45%.
Al in the sintered microporous corundum aggregate that bottom refractory casting bed of material 6b adopts
2o
3content>=99.5%, volume density are 3.0 ~ 3.3g/cm
3, closed porosity>=10%, granule interior mean pore size≤0.5 μm, overall particle diameter≤18mm.Sintered microporous corundum aggregate is divided into by size: 12mm < particle diameter≤18mm, 7mm < particle diameter≤12mm, 3mm < particle diameter≤7mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits over sintered microporous corundum aggregate is followed successively by: 20%, 30%, 20%, 15% and 15%.
The Al contained in the corundum aggregate of spinel of bottom refractory casting bed of material 6b employing
2o
3content>=95%, content of MgO>=3%, Spinel content>=10%, overall particle diameter≤5mm.Corundum aggregate containing spinel is divided into by size: 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm tri-gratings, each grade fits over and be followed successively by containing the weight percent in the corundum aggregate of spinel: 30%, 40% and 30%.
Simultaneously:
Comprehensive particle diameter≤the 0.088mm of fine powder, and fine powder is mixed by component A and B component, in the present embodiment, component A is fused white corundum, and B component is the electrosmelted magnesite clinker of content of MgO >=97%, and the weight ratio of component A and B component is 1: 1.5;
Micro mist is by SiO
2micro mist and active alpha-Al
2o
3micro mist mixes, SiO
2the SiO of micro mist
2content>=92%, particle diameter≤5 μm; Active alpha-Al
2o
3α-the Al of micro mist
2o
3content>=99%, particle diameter≤10 μm.SiO in the present embodiment
2micro mist and active alpha-Al
2o
3the mixed weight ratio of micro mist is 1: 15.
In the present embodiment, bonding agent adopts the mixture of pure calcium aluminate cement and hydrated aluminum oxide, and its blending ratio is 2: 1, the polycarboxylic acids dehydragent ADS1/ADW1 that water reducer adopts Qingdao An Mai company to produce;
Embodiment 4:
As shown in Figure 1, the outsourcing flame retardant coating 6 in the present embodiment is identical with embodiment 1, and top refractory casting bed of material 6a adopts corundum reclaimed materials to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Corundum reclaimed materials 48%;
Sintering plate corundum aggregate 21.85%;
Fine powder 14.88%;
Micro mist 9%;
Bonding agent 5%;
Water reducer 0.15%;
Organic explosion-proof fiber 0.12%;
Stainless Steel Fibre 1.0%;
Bottom refractory casting bed of material 6b adopts sintered microporous corundum aggregate to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Sintered microporous corundum aggregate 38%;
Containing the corundum aggregate 31.65% of spinel;
Fine powder 14.9%;
Micro mist 8%;
Bonding agent 5%;
Water reducer 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 adopts is with the carbon-free prefabricated component of rear ladle corundum, with the mouth of a river under rear ladle corundum, with rear ladle corundum pocket block, with one or more the mixture in rear ladle corundum air supply brick brick cup, its overall particle diameter≤12mm; With the carbon-free prefabricated component of rear ladle corundum successively through choose, remove slag, broken, strong magnetic deironing and sieve operation process and obtain, wherein Al
2o
3weight content>=97.5%, CaO weight content≤1.0%, Fe
2o
3weight content≤0.8%.Corundum reclaimed materials is divided into by size: 8mm < particle diameter≤12mm, 5mm < particle diameter≤8mm, 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits in corundum reclaimed materials is followed successively by: 19%, 31%, 19%, 17% and 14%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a adopts is divided into by size: 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm two gratings, the weight percent that each grade fits in sintering plate corundum aggregate is followed successively by: 52% and 48%.
Al in the sintered microporous corundum aggregate that bottom refractory casting bed of material 6b adopts
2o
3content>=99.5%, volume density are 3.0 ~ 3.3g/cm
3, closed porosity>=10%, granule interior mean pore size≤0.5 μm, overall particle diameter≤18mm.Sintered microporous corundum aggregate is divided into by size: 12mm < particle diameter≤18mm, 7mm < particle diameter≤12mm, 3mm < particle diameter≤7mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits over sintered microporous corundum aggregate is followed successively by: 19%, 31%, 19%, 17% and 14%.
The Al contained in the corundum aggregate of spinel of bottom refractory casting bed of material 6b employing
2o
3content>=95%, content of MgO>=3%, Spinel content>=10%, overall particle diameter≤5mm.Corundum aggregate containing spinel is divided into by size: 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm tri-gratings, each grade fits over and be followed successively by containing the weight percent in the corundum aggregate of spinel: 29%, 40% and 31%.
Simultaneously:
Comprehensive particle diameter≤the 0.088mm of fine powder, and fine powder is mixed by component A and B component, in the present embodiment, component A is fused white corundum, and B component is the electrosmelted magnesite clinker of content of MgO >=97%, and the weight ratio of component A and B component is 1: 1;
Micro mist is by SiO
2micro mist and active alpha-Al
2o
3micro mist mixes, SiO
2the SiO of micro mist
2content>=92%, particle diameter≤5 μm; Active alpha-Al
2o
3α-the Al of micro mist
2o
3content>=99%, particle diameter≤10 μm.SiO in the present embodiment
2micro mist and active alpha-Al
2o
3the mixed weight ratio of micro mist is 1: 18.
In the present embodiment, bonding agent adopts pure calcium aluminate cement, and water reducer adopts the mixture of tripoly phosphate sodium STPP and Sodium hexametaphosphate 99, and its blending ratio is 1: 1;
Embodiment 5:
As shown in Figure 1, the outsourcing flame retardant coating 6 in the present embodiment is identical with embodiment 1, and top refractory casting bed of material 6a adopts corundum reclaimed materials to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Corundum reclaimed materials 47%;
Sintering plate corundum aggregate 23.6%;
Fine powder 11.85%;
Micro mist 12.7%;
Bonding agent 4%;
Water reducer 0.4%;
Organic explosion-proof fiber 0.15%;
Stainless Steel Fibre 0.3%;
Bottom refractory casting bed of material 6b adopts sintered microporous corundum aggregate to be the corundum spinel mould material of main preparation, unlike wherein each component weight percent is:
Sintered microporous corundum aggregate 42%;
Containing the corundum aggregate 29.8% of spinel;
Fine powder 11.85%;
Micro mist 10%;
Bonding agent 4%;
Water reducer 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 adopts is with the carbon-free prefabricated component of rear ladle corundum, with the mouth of a river under rear ladle corundum, with rear ladle corundum pocket block, with one or more the mixture in rear ladle corundum air supply brick brick cup, its overall particle diameter≤12mm; With the carbon-free prefabricated component of rear ladle corundum successively through choose, remove slag, broken, strong magnetic deironing and sieve operation process and obtain, wherein Al
2o
3weight content>=97.5%, CaO weight content≤1.0%, Fe
2o
3weight content≤0.8%.Corundum reclaimed materials is divided into by size: 8mm < particle diameter≤12mm, 5mm < particle diameter≤8mm, 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits in corundum reclaimed materials is followed successively by: 21%, 29%, 21%, 15% and 14%.
The sintering plate corundum aggregate that top refractory casting bed of material 6a adopts is divided into by size: 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm two gratings, the weight percent that each grade fits in sintering plate corundum aggregate is followed successively by: 58% and 42%.
Al in the sintered microporous corundum aggregate that bottom refractory casting bed of material 6b adopts
2o
3content>=99.5%, volume density are 3.0 ~ 3.3g/cm
3, closed porosity>=10%, granule interior mean pore size≤0.5 μm, overall particle diameter≤18mm.Sintered microporous corundum aggregate is divided into by size: 12mm < particle diameter≤18mm, 7mm < particle diameter≤12mm, 3mm < particle diameter≤7mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits over sintered microporous corundum aggregate is followed successively by: 21%, 29%, 21%, 15% and 14%.
The Al contained in the corundum aggregate of spinel of bottom refractory casting bed of material 6b employing
2o
3content>=95%, content of MgO>=3%, Spinel content>=10%, overall particle diameter≤5mm.Corundum aggregate containing spinel is divided into by size: 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm tri-gratings, each grade fits over and be followed successively by containing the weight percent in the corundum aggregate of spinel: 30%, 40% and 30%.
Simultaneously:
Comprehensive particle diameter≤the 0.088mm of fine powder, and fine powder is mixed by component A and B component, in the present embodiment, component A is sintering plate corundum, and B component is aluminum-spinel, and the weight ratio of component A and B component is 1: 1.8;
Micro mist is by SiO
2micro mist and active alpha-Al
2o
3micro mist mixes, SiO
2the SiO of micro mist
2content>=92%, particle diameter≤5 μm; Active alpha-Al
2o
3α-the Al of micro mist
2o
3content>=99%, particle diameter≤10 μm.SiO in the present embodiment
2micro mist and active alpha-Al
2o
3the mixed weight ratio of micro mist is 1: 16.
In the present embodiment, bonding agent adopts pure hydrated aluminum oxide, and water reducer adopts Sodium hexametaphosphate 99;
The moulding process of composite RH refining furnace soaking tub encasing described in above-described embodiment 1 ~ 5, comprises the following steps:
1, according to weight percent by after the raw materials used weighing of top refractory casting bed of material 6a, drop in forced stirrer and stir 2 ~ 3min, to be mixed evenly after discharging for subsequent use; Equally, according to weight percent by after the raw materials used weighing of bottom refractory casting bed of material 6b, drop in forced stirrer and stir 2 ~ 3min, evenly rear discharging to be mixed is for subsequent use;
2, install ring flange 1 in advance at steel courage body 2 top of tubular structure, and install in advance inside steel courage body 2 or poured into a mould inner core flame retardant coating 4, its entirety is placed on working plate; Then, the peripheral refractory castable fetal membrane of brush oil is fixed on steel courage body 2 peripheral, and ensures that the distance between steel courage body 2 and peripheral refractory castable fetal membrane is even;
3, the steel courage body 2 adjusting distance is inverted together with peripheral refractory castable fetal membrane is placed on shaking platform;
4, by raw materials used for the top refractory casting bed of material 6a stirring that adds water, amount of water is 3.8 ~ 4.2% of raw materials used gross weight, churning time 3 ~ 5min, pour in the gap between steel courage body 2 and peripheral refractory castable fetal membrane after stirring, open shaking platform to vibrate, in mould material, insert vibrating head strengthening vibration simultaneously;
5, stop when top refractory casting bed of material 6a is poured into setting height pouring into, simultaneously by raw materials used for the bottom refractory casting bed of material 6b stirring that adds water, amount of water is 4.0 ~ 4.2% of raw materials used gross weight, churning time 3 ~ 5min, continue after stirring to pour in the gap between steel courage body 2 and peripheral refractory castable fetal membrane, and in mould material, insert vibrating head strengthening vibration, till mould material surface bleeding, form outsourcing flame retardant coating 6;
6, the maintenance demoulding is carried out to outsourcing flame retardant coating 6 shaping outside steel courage body 2, when room temperature is lower than 15 DEG C, at least natural curing 48h demoulding again; When room temperature is higher than 15 DEG C, at least natural curing 24h demoulding again;
7, the above rebake of natural curing 240h is continued after the demoulding; In bake process, be first raised to 110 DEG C with the heat-up rate of 10 ~ 12 DEG C/h from room temperature, 110 DEG C time, be incubated 24h; Be warmed up to 250 DEG C with the heat-up rate of 9 ~ 10 DEG C/h again, 250 DEG C time, be incubated 24h; Be warmed up to 450 DEG C with the heat-up rate of 8 ~ 9 DEG C/h again, cease fire be incubated 12h 450 DEG C time after, naturally cooling, cooling time is 15 ~ 20h, can obtain RH refining furnace soaking tub.
Finally, it should be pointed out that above embodiment is only the more representational example of the present invention.Obviously, the invention is not restricted to above-described embodiment, many distortion can also be had.Every according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all should think and belong to protection scope of the present invention.
Claims (12)
1. a composite RH refining furnace soaking tub encasing, is arranged on this soaking tub steel courage body (2) outside in tubular construction, adopts integrated poured structure to form outsourcing flame retardant coating (6), it is characterized in that:
Described outsourcing flame retardant coating (6) is combined by the exposed aerial top refractory casting bed of material (6a) and the bottom refractory casting bed of material (6b) be immersed in molten steel (7);
The described top refractory casting bed of material (6a) adopts corundum reclaimed materials to be the corundum spinel mould material of main preparation, and wherein each component weight percent is:
The described bottom refractory casting bed of material (6b) adopts sintered microporous corundum aggregate to be the corundum spinel mould material of main preparation, and wherein each component weight percent is:
Simultaneously:
Particle diameter≤the 0.088mm of described fine powder, and described fine powder is mixed by component A and B component, described component A is any one in fused white corundum and sintering plate corundum, described B component is any one in the electrosmelted magnesite clinker of aluminum-spinel, content of MgO >=97%, and the weight ratio of described component A and B component is 1 ~ 2: 1;
Particle diameter≤20 μm of described micro mist, and described micro mist is by SiO
2micro mist and active alpha-Al
2o
3micro mist mixes, described SiO
2micro mist and active alpha-Al
2o
3the weight ratio of micro mist is 1: 10 ~ 20.
2. composite RH refining furnace soaking tub encasing according to claim 1, it is characterized in that: the corundum reclaimed materials that the described top refractory casting bed of material (6a) adopts is with the carbon-free prefabricated component of rear ladle corundum, with the mouth of a river under rear ladle corundum, with rear ladle corundum pocket block, with one or more the mixture in rear ladle corundum air supply brick brick cup, its overall particle diameter≤12mm; Described with the carbon-free prefabricated component of rear ladle corundum successively through choose, remove slag, broken, strong magnetic deironing and sieve operation process and obtain, wherein Al
2o
3weight content>=97.5%, CaO weight content≤1.0%, Fe
2o
3weight content≤0.8%.
3. composite RH refining furnace soaking tub encasing according to claim 2, it is characterized in that: described corundum reclaimed materials is divided into by size: 8mm < particle diameter≤12mm, 5mm < particle diameter≤8mm, 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits in corundum reclaimed materials is followed successively by: 18 ~ 22%, 28 ~ 32%, 18 ~ 22%, 13 ~ 17% and 13 ~ 15%.
4. composite RH refining furnace soaking tub encasing according to claim 1, it is characterized in that: the sintering plate corundum aggregate that the described top refractory casting bed of material (6a) adopts is divided into by size: 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm two gratings, the weight percent that each grade fits in sintering plate corundum aggregate is followed successively by: 50 ~ 60% and 40 ~ 50%.
5. composite RH refining furnace soaking tub encasing according to claim 1, is characterized in that: the Al in the sintered microporous corundum aggregate that the described bottom refractory casting bed of material (6b) adopts
2o
3content>=99.5%, volume density are 3.0 ~ 3.3g/cm
3, closed porosity>=10%, granule interior mean pore size≤0.5 μm, overall particle diameter≤18mm.
6. composite RH refining furnace soaking tub encasing according to claim 5, it is characterized in that: described sintered microporous corundum aggregate is divided into by size: 12mm < particle diameter≤18mm, 7mm < particle diameter≤12mm, 3mm < particle diameter≤7mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm five gratings, the weight percent that each grade fits over sintered microporous corundum aggregate is followed successively by: 18 ~ 22%, 28 ~ 32%, 18 ~ 22%, 13 ~ 17% and 13 ~ 15%.
7. composite RH refining furnace soaking tub encasing according to claim 1, is characterized in that: the described bottom refractory casting bed of material (6b) adopt containing spinel corundum aggregate in Al
2o
3content>=95%, content of MgO>=3%, Spinel content>=10%, overall particle diameter≤5mm.
8. composite RH refining furnace soaking tub encasing according to claim 7, it is characterized in that: the described corundum aggregate containing spinel is divided into by size: 3mm < particle diameter≤5mm, 1mm < particle diameter≤3mm and 0mm < particle diameter≤1mm tri-gratings, each grade fits over and be followed successively by containing the weight percent in the corundum aggregate of spinel: 28 ~ 32%, 36 ~ 44% and 28 ~ 32%.
9. composite RH refining furnace soaking tub encasing according to claim 1, is characterized in that: in the mixed composition of described micro mist, SiO
2the SiO of micro mist
2content>=92%, particle diameter≤5 μm; Active alpha-Al
2o
3α-the Al of micro mist
2o
3content>=99%, particle diameter≤10 μm.
10. composite RH refining furnace soaking tub encasing according to claim 1, is characterized in that: described bonding agent is the mixture of one or both arbitrary proportions in pure calcium aluminate cement, hydrated aluminum oxide.
11. composite RH refining furnace soaking tub encasing according to claim 1, is characterized in that: described water reducer is the mixture of one or more arbitrary proportions in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, polycarboxylic acids dehydragent ADS1/ADW1.
The moulding process of composite RH refining furnace soaking tub encasing described in 12. 1 kinds of claims 1, comprises the following steps:
1) according to described weight percent by after the refractory casting bed of material (6a) the raw materials used weighing of top, drop in forced stirrer and stir 2 ~ 3min, to be mixed evenly after discharging for subsequent use; Equally, according to described weight percent by after the refractory casting bed of material (6b) the raw materials used weighing of bottom, drop in forced stirrer and stir 2 ~ 3min, evenly rear discharging to be mixed is for subsequent use;
2) ring flange (1) is installed in advance at steel courage body (2) top of described tubular structure, and install or poured into a mould inner core flame retardant coating (4) in advance in steel courage body (2) inner side, its entirety is placed on working plate; Then, the peripheral refractory castable fetal membrane of brush oil is fixed on steel courage body (2) peripheral, and ensures that the distance between steel courage body (2) and peripheral refractory castable fetal membrane is even;
3) the steel courage body (2) and peripheral refractory castable fetal membrane of adjusting distance are inverted together are placed on shaking platform;
4) by raw materials used for the top refractory casting bed of material (6a) stirring that adds water, amount of water is 3.8 ~ 4.2% of raw materials used gross weight, churning time 3 ~ 5min, pour in the gap between steel courage body (2) and peripheral refractory castable fetal membrane after stirring, open shaking platform to vibrate, in mould material, insert vibrating head strengthening vibration simultaneously;
5) stop when the top refractory casting bed of material (6a) is poured into setting height pouring into, simultaneously by raw materials used for the bottom refractory casting bed of material (6b) stirring that adds water, amount of water is 4.0 ~ 4.2% of raw materials used gross weight, churning time 3 ~ 5min, continue after stirring to pour in the gap between steel courage body (2) and peripheral refractory castable fetal membrane, and in mould material, insert vibrating head strengthening vibration, till mould material surface bleeding, form outsourcing flame retardant coating (6);
6) the maintenance demoulding is carried out to the shaping outsourcing flame retardant coating (6) in steel courage body (2) outside, when room temperature is lower than 15 DEG C, at least natural curing 48h demoulding again; When room temperature is higher than 15 DEG C, at least natural curing 24h demoulding again;
7) the above rebake of natural curing 240h is continued after the demoulding; In bake process, be first raised to 110 DEG C with the heat-up rate of 10 ~ 12 DEG C/h from room temperature, 110 DEG C time, be incubated 23 ~ 25h; Be warmed up to 250 DEG C with the heat-up rate of 9 ~ 10 DEG C/h again, 250 DEG C time, be incubated 23 ~ 25h; Be warmed up to 450 DEG C with the heat-up rate of 8 ~ 9 DEG C/h again, cease fire be incubated 11 ~ 13h 450 DEG C time after, naturally cooling, cooling time is 12 ~ 24h, can obtain RH refining furnace soaking tub.
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| CN113943167A (en) * | 2021-12-02 | 2022-01-18 | 湖南湘钢瑞泰科技有限公司 | RH dip pipe castable and preparation method thereof |
| CN115340370A (en) * | 2022-08-17 | 2022-11-15 | 江苏锦耐新材料科技有限公司 | High-alumina self-flow castable based on used refractory material and preparation method thereof |
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Cited By (12)
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| CN106493320A (en) * | 2016-10-28 | 2017-03-15 | 北京利尔高温材料股份有限公司 | A kind of tundish cover of continuous casting tundish castable and preparation method thereof |
| CN107311672A (en) * | 2017-06-30 | 2017-11-03 | 张静芬 | A kind of aluminium chloride combination castable |
| JP2022548176A (en) * | 2019-09-26 | 2022-11-16 | 瀋陽恒泰▲しん▼源精鋳耐材有限公司 | Ultra-thin aluminum base runner groove |
| JP7313562B2 (en) | 2019-09-26 | 2023-07-24 | 瀋陽恒泰▲しん▼源精鋳耐材有限公司 | Ultra-thin aluminum base runner groove |
| CN110903077A (en) * | 2019-12-20 | 2020-03-24 | 攀枝花钢城集团有限公司 | Castable for ladle cover of steelmaking tundish |
| CN111960806A (en) * | 2020-08-18 | 2020-11-20 | 武汉钢铁集团耐火材料有限责任公司 | Recycling method of rebound material of RH dip pipe gunning material |
| CN113477931A (en) * | 2021-07-16 | 2021-10-08 | 山东鲁铭高温材料股份有限公司 | Casting water nozzle for ferrochrome granulation system |
| CN113477931B (en) * | 2021-07-16 | 2024-01-19 | 山东鲁铭新型材料股份有限公司 | Pouring water nozzle for ferrochrome granulating system |
| CN113943167A (en) * | 2021-12-02 | 2022-01-18 | 湖南湘钢瑞泰科技有限公司 | RH dip pipe castable and preparation method thereof |
| CN115340370A (en) * | 2022-08-17 | 2022-11-15 | 江苏锦耐新材料科技有限公司 | High-alumina self-flow 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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