CN110372406A - A kind of converter slag-resisting Al2O3Outer nozzle brick of-C and preparation method thereof - Google Patents
A kind of converter slag-resisting Al2O3Outer nozzle brick of-C and preparation method thereof Download PDFInfo
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract
The invention discloses a kind of converter slag-resisting Al2O3Outer nozzle brick of-C and preparation method thereof, belongs to nozzle brick technical field.The outer nozzle brick includes aggregate and matrix, wherein the ratio of the aggregate and matrix is 65:35, the raw material components of the aggregate mainly include fused white corundum particle, and the raw material components of the matrix mainly include that fused white corundum fine powder and slide plate grind fecula again；Additional aggregate and the matrix gross mass of accounting for is the thermosetting phenolic resin of 4.5wt% and the hard resin of 0.5wt%.The discarded powder that the generation of slide plate plate face is ground using finishing by homogenizing, grinding, drying, and is added composite sintering knot agent and regeneration fine powder material is made, and prepare converter slag-resisting Al with this2O3The outer nozzle brick of-C, not only effectively solve slide plate grind generate useless pug recycle and problem of environmental pollution, the outer nozzle brick production cost of converter is greatly reduced, there are biggish economic results in society.
Description
Technical field
The invention belongs to nozzle brick technical fields, are kept off more specifically to a kind of using the preparation converter of slide plate powder-grinding
Slag Al2O3Outer nozzle brick of-C and preparation method thereof.
Background technique
Blocking dregs of converter furnace sliding plate technology has as Converter Skimming system and improves alloy recovery, reduces impurity in steel,
The advantages that reducing rephosphorization and improving molten steel cleanness, is now widely used in converter smelting.Blocking dregs of converter furnace sliding plate refractory material includes
Five refractory components such as tapping hole brick, inner nozzle brick, upper slide, lower skateboard, outer nozzle brick.In molten steel tapping process, the outer mouth of a river
Brick averagely smelts 13 furnace of service life, molten steel, the washing away repeatedly of steel slag, under corrosion function can reaming damage, or even occur seeping steel thing
Therefore this requires outer nozzle bricks to have excellent thermal shock resistance and erosion-resisting characteristics；In addition, outer nozzle brick is in tapping process
Liquid steel temperature is up to 1650 DEG C or more, and the high pressure that outer nozzle brick needs to bear molten steel in tapping is washed away and high temperature erosion, so that outside
Nozzle brick easily becomes loose porous because of oxidation, and intensity declines and easily occur longitudinal crack, or even fracture and erosion reaming, seriously
Influence the stability used and safety of the outer nozzle brick of converter slag-resisting.
Currently, using numerically control grinder to guarantee steel ladle slide board, converter slag-resisting slide plate plate face flatness requirement (≤0.05mm)
It is ground, plate face average cut amount is to grind the quality that process is ground off accounts for about molding semi product 5% in 2~4mm.Therefore,
A large amount of slide plate powder-grinding is generated every year, effectively cannot be digested and be recycled always at present.On the one hand slide plate powder-grinding is made
It is wasted at non-renewable resources；On the other hand the useless powder of the slide plate that can not be handled causes seriously to pollute to environment.
In order to solve the problems, such as that slide plate powder-grinding is intractable, through retrieving, Xu Chengfeng et al. will be by dry and fragmentation processing
Slide plate powder-grinding replace or all replace premixing flour (" the slide plate powder-grinding mud in common aluminum-zirconium-carbon slide factory formula on a small quantity
Research on utilization in slide plate " .2013/1. refractory material), ground with the slide plate of a small amount of (mass fraction 1.9%~5.5%) dry
When powder mud part replaces the premixing flour in slide plate factory formula, the performance of slide plate is influenced smaller；All replace premixing flour with it
And when aluminium powder and enhancing water resistant agent progress matrix adjusting is added, the close even more than slide plate production of the properties of outer nozzle brick
Outer nozzle brick.Above-mentioned process is analyzed, slide plate powder-grinding is dry and fragmentation is directly used in and prepares aluminum-zirconium-carbon slide, wherein needing
Increase aluminum-zirconium-carbon slide to be adjusted.But directly to be contacted with water in grinding technology process middle slide plate, it is ground out a large amount of slide plates
Powder.Slide plate component itself generates a large amount of Al there are also the metallic aluminium of 3%-6% or so in sintering process4C3, and Al4C3It is long with water
Phase contact, which can react, can generate a large amount of Al (OH)3If the unprocessed direct use of powder-grinding, the Al (OH) of generation3It is very unstable,
It is readily generated γ-Al2O3And H2O, which is one along with volume expansion, so that product internal material is acutely anti-
It answers, so that product is generated a large amount of crackles for release reaction stress, cause the broken of the institutional framework of strength of materials decaying and product itself
Bad, the reaction process and hydration phenomena, hydration phenomena will cause serious negative consequence i.e. scrap of the product.
In addition, our company also proposed a solution, being specifically shown in Chinese Patent Application No. is 201810447533.2,
Publication date is that the patent application document on the 3rd of August in 2018 discloses a kind of aluminium carbon fire clay of addition slide plate regeneration fine powder, group
At ingredient and weight percent are as follows: bauxite chamotte 15~25%, slide plate regeneration fine powder 45~60%, alumina powder 10~
15%, kyanite 3~10%, Guangxi white clay 5~10%, crystalline flake graphite 0.5~2%, asphalt powder 1~1.5%, total weight percentage
Than being 100%；Additive are as follows: sodium tripolyphosphate 0~0.5%, yellow starch gum 0.5~1%, polyacrylamide 0.01~0.05%,
Glycerol 0~2%, water 14~20%.It is well known that aluminium carbon fire clay and outer nozzle brick are two kinds of materials of different nature, and make
With environment difference, there are bigger differences for the requirement to performance.
For another example, other companies also proposed a similar solution, is specifically shown in Chinese Patent Application No. and is
201810376225.5, publication date discloses a kind of useless using slide plate grinding mud for the patent application document on the 21st of August in 2018
Lower nozzle brick made of expecting, raw material are as follows: 85 alumina 30~40% of 3~1mm of granularity；85 alumina 20 of 1~0mm of granularity~
30%；Granularity≤0.088mm vero mud 3~6%；94% metallic silicon power 2~5% of granularity≤0.045mm；Granularity≤
The recycling slide plate of 0.045mm is ground mud 20~35%；α-the Al of granularity≤2 μm2O3Micro mist 3~5%；- 194 crystalline flake graphites 1~
5%；Bonding agent phenolic resin 3~7%.It is well known that the complicated component of unprocessed good slide plate grinding mud, ingredient are unstable
It is fixed, the bad control of collector nozzle product quality that it is produced directly as raw material, it is important to which collector nozzle of ladle smelts casting
It when molten steel, pours the steel time 30 minutes to 60 minutes and differs with up to 1650 DEG C of molten steel, washed away by molten steel in the presence of oxidation, invaded for a long time
The possibility of erosion, fracture brings very serious consequence to production is smelted once bleed-out accident occurs, gently then causes production to pause, weight
Then cause equipment and the heavy losses of personnel.
It to sum up states, about the integrated application of slide plate powder-grinding, especially applies on outer nozzle brick, need further
Research and discussion.
Summary of the invention
1. to solve the problems, such as
For the problem that existing slide plate powder-grinding is difficult, fail to be integrated into, the present invention provides a kind of converter slag-resisting
Al2O3The outer nozzle brick of-C uses slide plate powder-grinding as raw material to produce outer nozzle brick, in the premise for the performance for guaranteeing outer nozzle brick
Under, it is as much as possible to use slide plate powder-grinding, slide plate powder-grinding is sufficiently utilized, discharge is reduced, avoids pollution ring
Border.
The present invention also provides a kind of converter slag-resisting Al2O3The preparation method of the outer nozzle brick of-C, step linking orderly, obtain
Converter slag-resisting Al2O3The outer nozzle brick quality of-C is high, fully meets service performance requirement.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows:
Converter slag-resisting Al of the invention2O3The outer nozzle brick of-C, including aggregate and matrix, wherein the ratio of the aggregate and matrix
Example is 65:35, and the raw material components of the aggregate mainly include fused white corundum particle, and the raw material components of the matrix mainly wrap
Fecula again is ground containing fused white corundum fine powder and slide plate；The additional thermosetting property phenol for accounting for aggregate and matrix gross mass is 4.5wt%
The hard resin of urea formaldehyde and 0.5wt%.The slide plate grinds the Al that regeneration powder main component is 200 mesh2O3And it is a small amount of
Metallic silicon and metallic zinc.
In a kind of possible embodiment of the present invention, the raw material components of the aggregate include: the electricity of 5~3mm of partial size
Molten white fused alumina particle 15wt%, the fused white corundum particle 30wt% of 3~1mm of partial size, partial size≤1mm fused white corundum particle
20wt%.
In a kind of possible embodiment of the present invention, the raw material components of the matrix include: fused white corundum fine powder
5wt%~15wt%, slide plate grind regeneration powder 5wt%~15wt%, crystalline flake graphite 1wt%~2wt%, SiC fine powder 2wt%~
5wt%, α-Al2O3Micro mist+almag composite antioxidant 12wt%~14wt%.
In a kind of possible embodiment of the present invention, the change of the fused white corundum particle, fused white corundum fine powder
The weight percent for learning component is equal are as follows: Al2O3>=99.1%, K2O+Na2O≤0.35%, the partial size of the fused white corundum fine powder
≤0.088mm。
In a kind of possible embodiment of the present invention, the slide plate grinds again partial size≤0.045mm of fecula, and carbon contains
Amount is w (C) >=99%.
In a kind of possible embodiment of the present invention, partial size≤0.088mm of the crystalline flake graphite；The SiC fine powder
Partial size≤0.075mm.
In a kind of possible embodiment of the present invention, the α-Al2O3Micro mist: the ratio of almag composite antioxidant
Value is 3:1.
Converter slag-resisting Al of the invention2O3The preparation method of the outer nozzle brick of-C, comprising the following specific steps
Step S101, it prepares slide plate and grinds fecula again
1) slide plate powder-grinding is made into wherein Al by filter tank precipitation reaction4C3Al (OH) is generated with the abundant fully reacting of water3,
The slide plate powder-grinding sufficiently reacted in filter tank passes through plate type pressure filter, and preliminary slide plate of collecting grinds mud, and moisture control is 4%
~6%；
2) slide plate come will be collected and grind mud feeding tunnel oven drying, it is dry according to certain temperature curve；
3) the slide plate powder-grinding after drying, by horizontal type dry-process corundum ball mill ball milling, addition accounts for slide plate and grinds before ball milling
The metallic silicon of powder gross mass 2wt% and the composite sintering knot agent ratio of metallic zinc are 1:1 co-ground, and granularity control is ground out
For 200 mesh；By adding the agent of composite sintering knot, improves the sintering character of product, promotes the formation raising of carbon-to-carbon network anti-oxidant
Property, the densification of product, and then oxygen is prevented to enter, slow down the process using damage, extends product service life；
Step S102, ingredient is carried out by the mass ratio of aggregate and matrix 65:35, thermosetting phenolic resin and solid tree is added
Cosmetics, material mixes 2~3min, with 150MPa pressure compression moulding, after green body demoulding first through 200 DEG C, for 24 hours solidify, then pass through
1300 DEG C, 3h bury carbon heat treatment after natural cooling.
In a kind of possible embodiment of the present invention, the drying temperature curve is that room temperature is warming up to 80 DEG C, when heating
Between be 2h, dry 2h under 80 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 120 DEG C, heating-up time 2h by 80 DEG C,
Dry 2h under 120 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 150 DEG C, heating-up time 3h, 150 DEG C perseverances by 120 DEG C
Dry 3h under temperature state；Combustion gas dry kiln temperature is warming up to 180 DEG C, heating-up time 3h, 180 DEG C temperature constant states by 150 DEG C
Lower dry 3h；Combustion gas dry kiln temperature is warming up to drying under 210 DEG C, heating-up time 3h, 210 DEG C temperature constant states by 180 DEG C
13h, total drying time are 36h.By the temperature curve, it can quickly make Al (OH) in slide plate powder-grinding3Heated reaction
Generate Al2O3, reaction process is 2Al (OH)3→Al2O3(S)+H2O (g) obtains the Al that fusing point is 2054 DEG C2O3High rigidity
The stable compound of matter.
3. beneficial effect
Compared with the prior art, the invention has the benefit that
(1) converter slag-resisting Al of the invention2O3The outer nozzle brick of-C grinds the discarded powder of slide plate plate face generation using finishing
Material by homogenizing, grinding, drying, and adds composite sintering knot agent and regeneration fine powder material is made, and prepare converter slag-resisting with this
Al2O3The outer nozzle brick of-C, not only effectively solve slide plate grind generate useless pug recycle and problem of environmental pollution, also make
The outer nozzle brick production cost of converter is greatly reduced, and has biggish economic results in society；
(2) converter slag-resisting Al of the invention2O3The outer nozzle brick of-C, addition accounts for the total matter of slide plate powder-grinding before powder-grinding ball milling
The metallic silicon of 2wt% and the composite sintering knot agent co-ground of metallic zinc are measured, it is 200 mesh that granularity control, which is ground out,；By adding
Add composite sintering knot agent, the formation raising inoxidizability for improving the sintering character of product, promoting carbon-to-carbon network, the densification of product
Change, and then oxygen is prevented to enter, slow down the process using damage, extends product service life.
Detailed description of the invention
Fig. 1 is converter slag-resisting Al of the invention2O3The outer nozzle brick preparation method flow chart of-C；
Fig. 2 is that the outer nozzle brick of converter slag-resisting of the embodiment of the present invention M2, M3 formula preparation uses 15 front and back comparison diagrams.
Specific embodiment
The present invention is further described below combined with specific embodiments below.
Converter slag-resisting Al of the invention2O3The outer nozzle brick of-C includes aggregate and matrix, wherein the ratio of the aggregate and matrix
For 65:35, the raw material components of the aggregate include fused white corundum particle 15wt%, the 3~1mm of partial size of 5~3mm of partial size
Fused white corundum particle 30wt%, partial size≤1mm fused white corundum particle 20wt%, the raw material components of the matrix include
Have: fused white corundum fine powder 5wt%~15wt%, slide plate grind regeneration powder 5wt%~15wt%, crystalline flake graphite 1wt%~
2wt%, SiC fine powder 2wt%~5wt%, α-Al2O3Micro mist+almag composite antioxidant 12wt%~14wt%；It is additional
It accounts for aggregate and matrix gross mass is the thermosetting phenolic resin of 4.5wt% and the hard resin of 0.5wt%.The slide plate mill
Preparation, regeneration powder main component is the Al of 200 mesh2O3And a small amount of metallic silicon and metallic zinc.
Wherein, the weight percent of the chemical constituent of the fused white corundum particle, fused white corundum fine powder is equal are as follows:
Al2O3>=99.1%, K2O+Na2O≤0.35%, partial size≤0.088mm of the fused white corundum fine powder.The slide plate is ground
Partial size≤0.045mm of fecula again, carbon content are w (C) >=99%.Partial size≤0.088mm of the crystalline flake graphite；It is described
Partial size≤0.075mm of SiC fine powder.α-the Al2O3Micro mist: the ratio of almag composite antioxidant is 3:1.
Converter slag-resisting Al of the invention2O3The preparation method of the outer nozzle brick of-C, comprising the following specific steps
Step S101, it prepares slide plate and grinds fecula again
1) slide plate powder-grinding is made into wherein Al by filter tank precipitation reaction4C3Al (OH) is generated with the abundant fully reacting of water3,
The slide plate powder-grinding sufficiently reacted in filter tank passes through plate type pressure filter, and preliminary slide plate of collecting grinds mud, moisture control 4~
6%；
2) slide plate come will be collected and grind mud feeding tunnel oven drying, it is dry according to certain temperature curve；
The drying temperature curve is that room temperature is warming up under 80 DEG C, heating-up time 2h, 80 DEG C temperature constant states dry 2h；It will
Combustion gas dry kiln temperature is warming up under 120 DEG C, heating-up time 2h, 120 DEG C temperature constant states dry 2h by 80 DEG C；Combustion gas is dry
Kiln temperature degree is warming up under 150 DEG C, heating-up time 3h, 150 DEG C temperature constant states dry 3h by 120 DEG C；By combustion gas dry kiln temperature
Dry 3h is warming up under 180 DEG C, heating-up time 3h, 180 DEG C temperature constant states by 150 DEG C；By combustion gas dry kiln temperature by 180 DEG C
Dry 13h is warming up under 210 DEG C, heating-up time 3h, 210 DEG C temperature constant states, and total drying time is 36h.
By the temperature curve, it can quickly make Al (OH) in slide plate powder-grinding3Heated reaction generates Al2O3, anti-
Answering process is 2Al (OH)3→Al2O3(S)+H2O (g) obtains the Al that fusing point is 2054 DEG C2O3The stable chemical combination of high rigidity property
Object；
3) the slide plate powder-grinding after drying adds 2% metallic silicon by horizontal type dry-process corundum ball mill ball milling before ball milling
With the composite sintering knot agent co-ground of metallic zinc, it is 200 mesh that granularity control, which is ground out,；By adding the agent of composite sintering knot,
The sintering character for improving product, the formation for promoting carbon-to-carbon network improve inoxidizability, the densification of product, and then prevent oxygen
Into, slow down using damage process, extend product service life；
Step S102, ingredient is carried out by the mass ratio of aggregate and matrix 65:35, thermosetting phenolic resin and solid tree is added
Cosmetics, material mixes 2~3min, with 150MPa pressure compression moulding, after green body demoulding first through 200 DEG C, for 24 hours solidify, then pass through
1300 DEG C, 3h bury carbon heat treatment after natural cooling.
Fused white corundum particle, fused white corundum fine powder used in following embodiment, crystalline flake graphite, SiC fine powder, α-
Al2O3Micro mist, almag composite antioxidant, metallic silicon, metallic zinc, thermosetting phenolic resin and hard resin are by market
It is commercially available；Slide plate powder-grinding mainly by our company produce slide plate, see application number 201810637618.7 or
201610943430.6。
Embodiment M1
The converter slag-resisting Al of the present embodiment2O3The outer nozzle brick of-C, raw material components proportion are shown in Table 1.
As shown in Figure 1, converter slag-resisting Al2O3The preparation method of the outer nozzle brick of-C, comprising the following specific steps
Step S101, it prepares slide plate and grinds fecula again
1) slide plate powder-grinding is made into wherein Al by filter tank precipitation reaction4C3Al (OH) is generated with the abundant fully reacting of water3,
The slide plate powder-grinding sufficiently reacted in filter tank passes through plate type pressure filter, and preliminary slide plate of collecting grinds mud, and moisture control exists
4%；
2) slide plate come will be collected and grind mud feeding tunnel oven drying, be that room temperature is warming up to 80 according to drying temperature curve
DEG C, heating-up time 2h, dry 2h under 80 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 120 DEG C by 80 DEG C, when heating
Between be 2h, dry 2h under 120 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 150 DEG C, heating-up time 3h by 120 DEG C,
Dry 3h under 150 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 180 DEG C, heating-up time 3h, 180 DEG C perseverances by 150 DEG C
Dry 3h under temperature state；Combustion gas dry kiln temperature is warming up to 210 DEG C, heating-up time 3h, 210 DEG C temperature constant states by 180 DEG C
Lower dry 13h, total drying time are 36h；
3) the slide plate powder-grinding after drying adds the metal of 2wt% by horizontal type dry-process corundum ball mill ball milling before ball milling
The composite sintering knot agent co-ground of silicon and metallic zinc, it is 200 mesh that granularity control, which is ground out, obtains slide plate and grinds fecula again；
Step S102, ingredient is carried out by the mass ratio of aggregate and matrix 65:35, thermosetting phenolic resin and solid tree is added
Cosmetics, material mixing 2min, with 150MPa pressure compression moulding, after green body demoulding first through 200 DEG C, for 24 hours solidify, then through 1300
DEG C, 3h bury carbon heat treatment after natural cooling.
The common way of slide plate powder-grinding is at present, such as application No. is remember in 201810376225.5 patent document
It carries, the categorized recycling of slide plate powder-grinding, uses mass fraction for the industrial dilute nitric acid pickling of 50%-70%, filtering, 150 at deposition
DEG C -200 DEG C dry 80-100 hour, to use 325 mesh screening process to obtain granularity≤0.045mm after vibromill is broken thin
Powder.This method is simple, but uses nitric acid acidwashing, and nitric acid is strong acid, can be with numerous substance reactions, finally obtained fine powder
In containing component it is more, if being used to prepare Al2O3The outer nozzle brick of-C, quality cannot ensure.
It is worth noting that on the one hand the present invention is improved the sintering character of product, is promoted by addition composite sintering knot agent
The formation of carbon-to-carbon network improves inoxidizability, the densification of product, and then oxygen is prevented to enter, and slows down the process using damage,
Extend product service life；On the other hand, during the grinding process, the agent of composite sintering knot can play good peptizaiton, make
The grain composition for obtaining again fecula is uniformly reasonable, ensure that the quality consistency of outer nozzle brick.
Embodiment M2
The converter slag-resisting Al of the present embodiment2O3The outer nozzle brick of-C, raw material components proportion are shown in Table 1, converter slag-resisting Al2O3-
The preparation method of the outer nozzle brick of C, comprising the following specific steps
Step S101, it prepares slide plate and grinds fecula again
1) slide plate powder-grinding is made into wherein Al by filter tank precipitation reaction4C3Al (OH) is generated with the abundant fully reacting of water3,
The slide plate powder-grinding sufficiently reacted in filter tank passes through plate type pressure filter, and preliminary slide plate of collecting grinds mud, and moisture control exists
5%；
2) slide plate come will be collected and grind mud feeding tunnel oven drying, be that room temperature is warming up to 80 according to drying temperature curve
DEG C, heating-up time 2h, dry 2h under 80 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 120 DEG C by 80 DEG C, when heating
Between be 2h, dry 2h under 120 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 150 DEG C, heating-up time 3h by 120 DEG C,
Dry 3h under 150 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 180 DEG C, heating-up time 3h, 180 DEG C perseverances by 150 DEG C
Dry 3h under temperature state；Combustion gas dry kiln temperature is warming up to 210 DEG C, heating-up time 3h, 210 DEG C temperature constant states by 180 DEG C
Lower dry 13h, total drying time are 36h；
3) the slide plate powder-grinding after drying adds the metal of 2wt% by horizontal type dry-process corundum ball mill ball milling before ball milling
The composite sintering knot agent co-ground of silicon and metallic zinc (wherein metallic silicon and the ratio of metallic zinc are 1:1), is ground out granularity
Control is 200 mesh, obtains slide plate and grinds fecula again；
Step S102, ingredient is carried out by the mass ratio of aggregate and matrix 65:35, thermosetting phenolic resin and solid tree is added
Cosmetics, material mixing 3min, with 150MPa pressure compression moulding, after green body demoulding first through 200 DEG C, for 24 hours solidify, then through 1300
DEG C, 3h bury carbon heat treatment after natural cooling.
Embodiment M3
The converter slag-resisting Al of the present embodiment2O3The outer nozzle brick of-C, raw material components proportion are shown in Table 1, converter slag-resisting Al2O3-
The preparation method of the outer nozzle brick of C, comprising the following specific steps
Step S101, it prepares slide plate and grinds fecula again
1) slide plate powder-grinding is made into wherein Al by filter tank precipitation reaction4C3Al (OH) is generated with the abundant fully reacting of water3,
The slide plate powder-grinding sufficiently reacted in filter tank passes through plate type pressure filter, and preliminary slide plate of collecting grinds mud, and moisture control exists
6%；
2) slide plate come will be collected and grind mud feeding tunnel oven drying, be that room temperature is warming up to 80 according to drying temperature curve
DEG C, heating-up time 2h, dry 2h under 80 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 120 DEG C by 80 DEG C, when heating
Between be 2h, dry 2h under 120 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 150 DEG C, heating-up time 3h by 120 DEG C,
Dry 3h under 150 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 180 DEG C, heating-up time 3h, 180 DEG C perseverances by 150 DEG C
Dry 3h under temperature state；Combustion gas dry kiln temperature is warming up to 210 DEG C, heating-up time 3h, 210 DEG C temperature constant states by 180 DEG C
Lower dry 13h, total drying time are 36h；
3) the slide plate powder-grinding after drying adds the metal of 2wt% by horizontal type dry-process corundum ball mill ball milling before ball milling
The composite sintering knot agent co-ground of silicon and metallic zinc, it is 200 mesh that granularity control, which is ground out, obtains slide plate and grinds fecula again；
Step S102, ingredient is carried out by the mass ratio of aggregate and matrix 65:35, thermosetting phenolic resin and solid tree is added
Cosmetics, material mixing 2.5min, with 150MPa pressure compression moulding, after green body demoulding first through 200 DEG C, for 24 hours solidify, then through 1300
DEG C, 3h bury carbon heat treatment after natural cooling.
Comparative example M0
The converter slag-resisting Al of this comparative example2O3The outer nozzle brick of-C, raw material components proportion are shown in Table 1, do not contain in raw material wherein
Slide plate grinds fecula again, and preparation method is consistent with embodiment M1.
1 converter slag-resisting Al of table2O3The raw material components of the outer nozzle brick of-C match
Cured and 1300 DEG C, the outer nozzle brick after 3h heat treatment, by the outer nozzle brick volume of GB/T 2997-2000 detection
Density and apparent porosity detect strength at normal temperature by GB/T 3001-2007, and GB/T 507-2008 detects the resistance to pressure of room temperature
Degree.The thermal shock resistance of outer nozzle brick is detected by water cooling: outer nozzle brick after 1300 DEG C, 3h heat treatment is placed in 1100 DEG C of Muffle furnaces
Middle heat preservation 30min takes out outer nozzle brick, and the chilling 3min in circulating water, takes out immediately, then standing time in air
Whether cracked 10min observes outer nozzle brick.It repeats this process and material is evaluated with this until outer nozzle brick is cracked
The thermal shock resistance of material.
The physical property of outer nozzle brick after the heat treatment of 2 different temperatures of table
Table 2 shows the physical property of outer nozzle brick after different temperatures heat treatment, it will thus be seen that with outer nozzle brick M0 phase
Than bulk density and apparent porosity change that slide plate grinds 3 kinds of outer nozzle bricks of regeneration fine powder is added after 200 DEG C of baking-curings
Change less, strength at normal temperature and compressive resistance slightly decline, and are primarily due to phenolic resin and aggregate, stone after 200 DEG C of bakings
The mix wettings such as ink, SiC fine powder are good, and inside forms solidified resin frame, and normal temperature strength is preferable.Hard resin in bonding agent
Powder is also cured, and forms carbon network structure in material internal, strength at normal temperature, cold crushing strength improve.Through 1300 DEG C
After burying carbon processing, as slide plate grinds the raising of regeneration fine powder additional amount, the bulk density decline of outer nozzle brick M1, M2, M3 are shown
The porosity rises.This is primarily due to the reduction of fused white corundum fine powder additional amount, and phenolic resin decomposes at high temperature, releases
CO2、H2O forms stomata in the material.1300 DEG C are buried strength at normal temperature after carbon is handled, cold crushing strength variation less.This
It is to improve the elevated temperature strength of material because crystalline flake graphite, SiC form the ceramic phase that carbon combines phase and carbide at high temperature.
The thermal shock resistance of detection for thermal shock resistance, outer nozzle brick M0, M1, M2, M3 is not much different, and shows good heat resistanceheat resistant
Shock stability.This is primarily due to the introducing of almag composite antioxidant, and the high temperature bond intensity of outer nozzle brick can be improved
And thermal shock resistance.
Comparative example M4
The slide plate of this comparative example grinds again the preparation method of fecula, comprising the following steps:
1) slide plate powder-grinding is made into wherein Al by filter tank precipitation reaction4C3Al (OH) is generated with the abundant fully reacting of water3,
The slide plate powder-grinding sufficiently reacted in filter tank passes through plate type pressure filter, and preliminary slide plate of collecting grinds mud, and moisture control exists
5%；
2) slide plate come will be collected and grind mud feeding tunnel oven drying, be that room temperature is warming up to 80 according to drying temperature curve
DEG C, heating-up time 2h, dry 2h under 80 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 120 DEG C by 80 DEG C, when heating
Between be 2h, dry 2h under 120 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 150 DEG C, heating-up time 3h by 120 DEG C,
Dry 3h under 150 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 180 DEG C, heating-up time 3h, 180 DEG C perseverances by 150 DEG C
Dry 3h under temperature state；Combustion gas dry kiln temperature is warming up to 210 DEG C, heating-up time 3h, 210 DEG C temperature constant states by 180 DEG C
Lower dry 13h, total drying time are 36h；
3) the slide plate powder-grinding after drying, by horizontal type dry-process corundum ball mill ball milling, it is 200 that granularity control, which is ground out,
Mesh obtains slide plate and grinds fecula again.
Slide plate grinds fecula again and contains Al2O3, and the grain composition of fecula again is analyzed, obtain coarse granule it is more and
In the presence of segregation situation, the converter slag-resisting Al being prepared2O3The quality degradation of the outer nozzle brick of-C.
Live use case
Two kinds of converter slag-resisting Al are prepared for according to embodiment M2, M3 formula2O3The outer nozzle brick of-C, batch application is in river respectively
It revives the 120t converter of certain steel mill, smelting condition: ladleful 100t, maximum tap are 110t, smelting cycle 35min
Furnace-1；Slag material is lime, light dolomite, calcined magnesite ball；Smelt steel grade are as follows: straight carbon steel, structural alloy steel, cord steel, bearing
Steel etc.；1650~1710 DEG C of Tapping Temperature of Bof, tap 3.5~7min of time；Enter converter molten iron chemical composition (w): C 4.0~
5.0%, Si≤1.25%, Mn 0.20~0.50%, P≤0.15%, S≤0.05%.
The result shows that: experimental converter outer mouth of a river average life is 15~17 furnaces.As shown in Fig. 2, original aperture isReaming is corroded using back aperture to arriveAverage 0.8~1.3mm of every furnace reaming.M2, M3 formula system
Two kinds of standby converter slag-resisting Al2O3For the outer nozzle brick of-C using melting loss and crackle without exception in rear peep hole, thermal shock resistance performance is good
It is good, reach the requirement of steel mill, and normally provide the product of goods without significant difference.
Described above is the further description done in conjunction with specific preferred embodiment to the present invention, not can determine that
Present invention specific implementation is confined to described above.For the member of ordinary skill of technical field of the present invention, do not departing from
Under the premise of present inventive concept, a number of simple deductions or replacements can also be made, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of converter slag-resisting Al2O3The outer nozzle brick of-C, including aggregate and matrix, which is characterized in that the wherein aggregate and matrix
Ratio be 65:35, the raw material components of the aggregate mainly include fused white corundum particle, the raw material components master of the matrix
It include that fused white corundum fine powder and slide plate grind fecula again；The additional thermosetting for accounting for aggregate and matrix gross mass is 4.5wt%
The hard resin of property phenolic resin and 0.5wt%.
2. converter slag-resisting Al according to claim 12O3The outer nozzle brick of-C, which is characterized in that the raw material components of the aggregate
Include: fused white corundum particle 30wt%, the partial size of the fused white corundum particle 15wt% of 5~3mm of partial size, 3~1mm of partial size
The fused white corundum particle 20wt% of≤1mm.
3. converter slag-resisting Al according to claim 12O3The outer nozzle brick of-C, which is characterized in that the raw material components of the matrix
Include: fused white corundum fine powder 5wt%~15wt%, slide plate grind regeneration powder 5wt%~15wt%, crystalline flake graphite 1wt%
~2wt%, SiC fine powder 2wt%~5wt%, α-Al2O3Micro mist+almag composite antioxidant 12wt%~14wt%.
4. converter slag-resisting Al according to any one of claims 1 to 32O3The outer nozzle brick of-C, which is characterized in that the electricity
The weight percent of the chemical constituent of molten white fused alumina particle, fused white corundum fine powder is equal are as follows: Al2O3>=99.1%, K2O+Na2O≤
0.35%, partial size≤0.088mm of the fused white corundum fine powder.
5. converter slag-resisting Al according to claim 42O3The outer nozzle brick of-C, which is characterized in that the slide plate grinds fecula again
Partial size≤0.045mm, carbon content be w (C) >=99%.
6. converter slag-resisting Al according to claim 52O3The outer nozzle brick of-C, which is characterized in that the partial size of the crystalline flake graphite
≤0.088mm；Partial size≤0.075mm of the SiC fine powder.
7. converter slag-resisting Al according to claim 32O3The outer nozzle brick of-C, which is characterized in that the α-Al2O3Micro mist: aluminium
The ratio of magnesium alloy composite antioxidant is 3:1.
8. a kind of converter slag-resisting Al2O3The preparation method of the outer nozzle brick of-C, which is characterized in that comprising the following specific steps
Step S101, it prepares slide plate and grinds fecula again
1) slide plate powder-grinding is made into wherein Al by filter tank precipitation reaction4C3Al (OH) is generated with the abundant fully reacting of water3, filtering
The slide plate powder-grinding sufficiently reacted in pond passes through plate type pressure filter, and preliminary slide plate of collecting grinds mud, moisture control 4%~
6%；
2) slide plate come will be collected and grind mud feeding tunnel oven drying, it is dry according to certain temperature curve；
3) the slide plate powder-grinding after drying, by horizontal type dry-process corundum ball mill ball milling, it is total to account for slide plate powder-grinding for addition before ball milling
The metallic silicon of quality 2wt% and the composite sintering knot agent co-ground of metallic zinc, it is 200 mesh that granularity control, which is ground out, is obtained
Slide plate grinds fecula again；
Step S102, ingredient is carried out by the mass ratio of aggregate and matrix 65:35, thermosetting phenolic resin and hard resin is added
Powder, material mixes 2~3min, with 150MPa pressure compression moulding, after green body demoulding first through 200 DEG C, for 24 hours solidify, then through 1300
DEG C, 3h bury carbon heat treatment after natural cooling.
9. converter slag-resisting Al according to claim 82O3The preparation method of the outer nozzle brick of-C, which is characterized in that the drying
Temperature curve is that room temperature is warming up under 80 DEG C, heating-up time 2h, 80 DEG C temperature constant states dry 2h；By combustion gas dry kiln temperature by
80 DEG C are warming up under 120 DEG C, heating-up time 2h, 120 DEG C temperature constant states dry 2h；Combustion gas dry kiln temperature is risen by 120 DEG C
Dry 3h under temperature to 150 DEG C, heating-up time 3h, 150 DEG C temperature constant states；Combustion gas dry kiln temperature is warming up to 180 by 150 DEG C
DEG C, heating-up time 3h, dry 3h under 180 DEG C of temperature constant states；Combustion gas dry kiln temperature is warming up to 210 DEG C by 180 DEG C, heating
Time is 3h, and dry 13h under 210 DEG C of temperature constant states, total drying time is 36h.
10. converter slag-resisting Al according to claim 82O3The preparation method of the outer nozzle brick of-C, which is characterized in that the gold
The ratio for belonging to silicon and metallic zinc is 1:1.
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| CN201910822517.1A CN110372406A (en) | 2019-09-02 | 2019-09-02 | A kind of converter slag-resisting Al2O3Outer nozzle brick of-C and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111116204A (en) * | 2019-12-13 | 2020-05-08 | 北京瑞普同创科技发展有限公司 | High-performance blast furnace main channel slag retaining wall prefabricated part, and preparation method and construction method thereof |
| CN114873997A (en) * | 2022-03-29 | 2022-08-09 | 内蒙古包钢利尔高温材料有限公司 | Composite lining brick produced by recycling various waste refractory materials for torpedo ladle |
| CN116589287A (en) * | 2023-01-08 | 2023-08-15 | 无锡市南方耐材有限公司 | Low-cost and long-service-life sliding plate brick and preparation method thereof |
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| CN105837233A (en) * | 2016-04-05 | 2016-08-10 | 鞍山浦项特种耐火材料有限公司 | Metal combined corundum ultralow carbon collector nozzle for special steel, and production technology thereof |
| CN107129793A (en) * | 2016-02-29 | 2017-09-05 | 江苏永和耐火材料有限公司 | A kind of slide plate is ground the recycling process of powder |
| CN108424155A (en) * | 2018-04-25 | 2018-08-21 | 宜兴市耐火材料有限公司 | It is a kind of to utilize lower nozzle brick and preparation method thereof made of slide plate grinding mud waste material |
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| CN107129793A (en) * | 2016-02-29 | 2017-09-05 | 江苏永和耐火材料有限公司 | A kind of slide plate is ground the recycling process of powder |
| CN105837233A (en) * | 2016-04-05 | 2016-08-10 | 鞍山浦项特种耐火材料有限公司 | Metal combined corundum ultralow carbon collector nozzle for special steel, and production technology thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111116204A (en) * | 2019-12-13 | 2020-05-08 | 北京瑞普同创科技发展有限公司 | High-performance blast furnace main channel slag retaining wall prefabricated part, and preparation method and construction method thereof |
| CN114873997A (en) * | 2022-03-29 | 2022-08-09 | 内蒙古包钢利尔高温材料有限公司 | Composite lining brick produced by recycling various waste refractory materials for torpedo ladle |
| CN116589287A (en) * | 2023-01-08 | 2023-08-15 | 无锡市南方耐材有限公司 | Low-cost and long-service-life sliding plate brick and preparation method thereof |
| CN116589287B (en) * | 2023-01-08 | 2024-04-05 | 无锡市南方耐材有限公司 | Low-cost and long-service-life sliding plate brick and preparation method thereof |
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