CN115974541B - Carbon-free magnesium sewer nozzle brick and preparation method thereof - Google Patents
Carbon-free magnesium sewer nozzle brick and preparation method thereof Download PDFInfo
- Publication number
- CN115974541B CN115974541B CN202310107105.6A CN202310107105A CN115974541B CN 115974541 B CN115974541 B CN 115974541B CN 202310107105 A CN202310107105 A CN 202310107105A CN 115974541 B CN115974541 B CN 115974541B
- Authority
- CN
- China
- Prior art keywords
- content
- forsterite
- particles
- percent
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011449 brick Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 9
- 229910052749 magnesium Inorganic materials 0.000 title claims description 9
- 239000011777 magnesium Substances 0.000 title claims description 9
- 239000002245 particle Substances 0.000 claims abstract description 121
- 229910052839 forsterite Inorganic materials 0.000 claims abstract description 82
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 82
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 63
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 35
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 27
- 239000006004 Quartz sand Substances 0.000 claims abstract description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 14
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 239000005011 phenolic resin Substances 0.000 claims abstract description 9
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 9
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 238000001035 drying Methods 0.000 claims description 26
- 239000010703 silicon Substances 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 210000001161 mammalian embryo Anatomy 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 description 10
- 229910001570 bauxite Inorganic materials 0.000 description 9
- 229910052593 corundum Inorganic materials 0.000 description 7
- 239000010431 corundum Substances 0.000 description 7
- 230000003628 erosive effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000007767 bonding agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 229910021389 graphene Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The invention discloses a carbon-free magnesia runner brick and a preparation method thereof. The nozzle brick comprises the following components: 50-65% of forsterite particles, 5-15% of quartz sand particles and 30-35% of co-milled powder, wherein the total percentage is 100%; adding 4.0 to 4.8 percent of phenolic resin binder; wherein the co-grinding powder is prepared by uniformly mixing 12% -25% of forsterite fine powder, 5% -7% of metal silicon powder, 4% of silicon carbide fine powder and 1% -4% of defatted aluminum powder; the forsterite particles are treated as follows: stirring forsterite particles and a coating agent solution, wherein the ratio of the coating agent added is 0.5-1.5% based on the total mass of the forsterite particles; the main component of the coating agent is nano silicon dioxide, the coating agent solution is alkalescent, the coating temperature is 25-40 ℃, and the stirring time is 2-4 hours, so as to obtain forsterite particles with the surfaces coated with the silicon dioxide.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a carbon-free magnesia runner brick and a preparation method thereof, which are used for producing cord steel.
Background
The ladle sliding gate technology is used as an important system for controlling the flow of molten steel in the process of ladle to tundish, and mainly comprises a driving device, a mechanical part and a refractory part, wherein the refractory part comprises a lower gate brick for connection with a lower slide plate brick, and the molten steel is carried and guided into the tundish by the lower gate after flowing through the slide plate brick; under the condition that the lower nozzle brick is always subjected to rapid flushing and erosion of molten steel in the tapping process, the lower nozzle brick is required to have good flushing resistance and thermal shock stability. At present, most domestic sewer bricks are made of bauxite serving as a basic raw material, phenolic resin serving as a bonding agent, and the sewer bricks have good flushing resistance and high-temperature strength.
The cord steel is used as the skeleton of tyre meridian, and has the features of high strength and high toughness. According to studies, when hard nonmetallic inclusions such as alumina and spinel exist in the cord steel, breakage easily occurs during drawing and stranding. However, after the conventional high-bauxite produced runner bricks are used, the Al content in molten steel is more than 0.003 percent (standard requirement is less than 0.003 percent), and the service life of the runner bricks is reduced because the runner bricks are corroded by molten steel more quickly.
The following are the patent documents that are relevant to the search:
patent document 1: the invention discloses a sewer nozzle brick and a preparation method thereof, wherein the sewer nozzle brick comprises a sewer nozzle brick main body, and the sewer nozzle brick main body is mainly prepared from the following raw materials in parts by weight: 50 to 70 parts of homogenized bauxite chamotte, 15 to 25 parts of corundum, 8 to 15 parts of spinel and Al 2 O 3 15 to 25 parts of pure calcium aluminate cement 3 to 8 parts of silicon dioxide 1 to 2 parts of silicon dioxide and 0.1 to 0.3 part of additive; wherein Al in the homogenized bauxite chamotte 2 O 3 The mass fraction of (2) is 75-85%.
Patent document 2: the patent publication No. CN107473759A, publication day is 2017, 12 months and 15 days, discloses a homogenized material toughened aluminum carbon sewer nozzle brick and a production method thereof, wherein the aluminum carbon sewer nozzle brick comprises the following raw materials in percentage by weight: 20-30% of 88 bauxite homogenizing material, 38-48% of platy corundum, 8-12% of electric melting white corundum, 1-2% of-298 crystalline flake graphite, 6-8% of aluminum silicon alloy powder, 6-9% of active a-alumina powder and 4-6% of Guangxi white mud, wherein the total amount of the raw materials is 100%; adding phenolic resin binder 3-4% of the total weight of the raw materials.
Patent document 3: the patent publication number is CN106083096A, the publication date is 2016, 11 and 9, and a plain carbon steel ladle sliding runner brick and a preparation method are disclosed; the lower nozzle brick comprises the following components in percentage by weight: 60-75% of fused quartz particles, 17-32% of fused quartz fine powder and alpha-Al 2 O 3 3 to 6 percent of micro powder, 0 to 3.0 percent of metal aluminum powder fine powder, 0 to 3.0 percent of metal silicon powder fine powder, 3 to 7 percent of-195 graphite, 100 percent of total percentage and 2 to 6 percent of additional bonding agent.
Patent document 4: the patent publication number is CN110066180A, the publication date is 2019, 7 months and 30 days, and the graphene high-performance sewer nozzle brick and the manufacturing process thereof are disclosed, wherein the graphene high-performance sewer nozzle brick is prepared from plate-shaped corundum 3-1:20-35%, plate-shaped corundum 0-1:18-34%, plate-shaped corundum 200:22-30%, carbon black: 2-5% of graphene: 1-5% of aluminum powder: 2-8% of zirconia corundum: 8-15% of the raw materials are mixed, then the mixture is put into a 1000T press machine for high-pressure molding, naturally dried for 24 hours, then put into a drying kiln for baking and drying for 24 hours, naturally cooled to 60-80 ℃, then put into a high-temperature kiln for sintering, after the raw materials are taken out of the kiln, the raw materials are cooled to room temperature, and finally the raw materials are processed and assembled by a precise machine tool, and finally the packaging is completed.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the existing sewer bricks cannot meet the production requirements of cord steel, the invention provides the carbon-free magnesia sewer bricks and the preparation method thereof, and the forsterite particles are used as raw materials, so that the aluminum content in the sewer bricks can be effectively reduced, the Al content in molten steel can reach below 0.003 percent, and the service life of the sewer bricks is prolonged by 15-20 percent.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to a carbon-free magnesia runner brick, which comprises the following components in percentage by weight: 50-65% of forsterite particles, 5-15% of quartz sand particles and 30-35% of co-milled powder, wherein the total percentage is 100%; 4.0 to 4.8 percent of phenolic resin bonding agent (accounting for the total weight of the forsterite particles, the quartz sand particles and the co-grinding powder) is added; wherein the co-grinding powder is prepared by uniformly mixing 12% -25% of forsterite fine powder, 5% -7% of metal silicon powder, 4% of silicon carbide fine powder and 1% -4% of defatted aluminum powder; the forsterite particles are treated as follows: stirring forsterite particles and a coating agent solution, wherein the weight percentage of the coating agent added is 0.5-1.5% based on the total mass of the forsterite particles; the main component of the coating agent is nano silicon dioxide, the coating agent solution is alkalescent (pH is 7-8), the coating temperature is 25-40 ℃, and the stirring time is 2-4 hours, so as to obtain forsterite particles with the surfaces coated with the silicon dioxide.
According to the present invention, the inventors of the present invention have found that the pH of the aqueous nano-silica solution directly influences the morphology of the surface coating of the forsterite particles and the thickness of the coating, and that under weakly alkaline conditions, on the one hand, part of the silica can be activated and on the other hand, a hydroxyl-based layer is formed on the surface of the forsterite particles, enhancing the hydrogen bonding of the nano-silica to the forsterite particles.
The inventors have passed a number of experiments and analyses, probably because: the porosity of the currently used forsterite particles is 16% -22%, so that the prepared forsterite particles are subjected to coating agent treatment, nano silicon dioxide is coated on the surfaces of the forsterite particles, and the nano silicon dioxide further fills pores on the surfaces of the forsterite particles, so that the compressive strength of the forsterite particles is improved; in addition, the carbon-free magnesium runner brick is applied to the steel tapping process of the cord steel, the surfaces of the forsterite particles are wrapped by nano silicon dioxide in a high-temperature alkaline environment, and the nano silicon dioxide can react with defatted aluminum powder and calcium in the molten steel to generate a compact layer, so that the possibility that impurity ions, particularly iron ions and manganese ions in steel slag, enter the interior of the forsterite brick (particularly through holes) is prevented, solid solution substances with larger thermal expansion coefficients are avoided, and the possibility of cracking of the carbon-free magnesium runner brick is reduced as much as possible; and simultaneously, the erosion resistance and scouring resistance of the carbon-free magnesia runner brick are improved.
In one embodiment of the invention, the particle size of the forsterite particles comprises three types of particles of 5-3 mm, 3-1 mm and 1-0 mm, wherein the weight percentages of the particle sizes are as follows: 10-15% of forsterite with the grain size of 5-3 mm, 25-35% of forsterite with the grain size of 3-1 mm and 15-25% of forsterite with the grain size of 1-0 mm; the forsterite comprises the following chemical components in percentage by weight: mgO content is 38% -47%, siO 2 The content of (2) is 39-44%, fe 2 O 3 The content of (2) is 7% -11%.
In one embodiment of the invention, the particle size of the quartz sand particles comprises 2-1 mm and 1-0 mm, wherein the weight percentage of each particle sizeThe ratio is as follows: 3-8% of quartz sand with the grain diameter of 2-1 mm and 3-8% of quartz sand with the grain diameter of 1-0 mm; the quartz sand comprises the following chemical components in percentage by weight: siO (SiO) 2 The content of (C) is more than or equal to 99 percent, and the volume density is more than or equal to 2.6g/cm 3 。
In one embodiment of the present invention, the forsterite powder has a particle size of 0 to 2 μm; the content of MgO in the forsterite fine powder is 37% -46%, and SiO is the material 2 The content of (3) is 38-44%, fe 2 O 3 The content of (2) is 8-12%.
In one embodiment of the present invention, the metal silicon powder comprises: si content is more than or equal to 99.0%, fe 2 O 3 The content of SiO is less than or equal to 0.2 percent 2 The content of free silicon is less than or equal to 0.1 percent and the content of free silicon is less than or equal to 0.4 percent.
In one embodiment of the present invention, the silicon carbide fine powder comprises: the content of SiC is more than or equal to 94.5 percent, fe 2 O 3 The content of SiO is less than or equal to 0.4 percent 2 The content of free carbon is less than or equal to 0.6 percent, the content of free silicon is less than or equal to 0.5 percent, and the content of free silicon is less than or equal to 0.6 percent.
In one embodiment of the present invention, in the defatted aluminum powder: the content of Al is more than or equal to 99 percent, the content of Fe is less than or equal to 0.2 percent, the content of Si is less than or equal to 0.2 percent, and the content of Cu is less than or equal to 0.1 percent.
The invention also aims at a preparation method of the carbon-free magnesia runner brick, which comprises the following steps:
step one: co-grinding preparation: uniformly mixing forsterite fine powder, metal silicon powder, silicon carbide fine powder and defatted aluminum powder according to the weight percentage to prepare co-milled powder;
step two: and (3) preparing particles: uniformly mixing forsterite particles with the particle size of 5-3 mm, forsterite particles with the particle size of 3-1 mm, forsterite particles with the particle size of 1-0 mm, quartz sand particles with the particle size of 2-1 mm and quartz sand particles with the particle size of 1-0 mm according to the weight percentage to obtain a particle aggregate;
step three: mixing: stirring the granular aggregate for 2-4 minutes by using a sand mixer, then adding a phenolic resin binder, wet-mixing for 8-9 minutes, adding co-milled powder, and rolling for 25-35 minutes to obtain a mixed pug;
step four: and (3) forming: pressing and forming the mixed pug on a 630t electric spiral brick press to obtain an embryo brick;
step five: and (3) drying: placing the green bricks into a natural gas drying kiln for drying, wherein the initial kiln feeding temperature is 35 ℃, and drying for more than 2 hours at the initial kiln feeding temperature; raising the temperature to 100 ℃ and drying at the temperature for more than 8 hours; heating to 220 deg.c and drying for over 14 hr;
step six: the shell is as follows: the steel shell is buckled on a water gap of the smeared fireclay, and is reversely placed into a tool, and the steel shell is matched with the assembly size by a reverse pressing method;
step seven: and (3) drying: drying at 150deg.C for more than 6 hr to harden the fire clay;
step eight: and (3) packaging: and (5) packaging after inspection to obtain a finished product.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) Compared with the conventional high-aluminum sewer bricks, the carbon-free magnesia sewer bricks have better flushing resistance and erosion resistance, and the service life is prolonged; the main component of forsterite is MgO, siO 2 And a small part of Fe 2 O 3 Therefore, the forsterite does not generate Al when in contact reaction with molten steel 2 O 3 And aluminum-containing nonmetallic inclusions. At the same time, 2 MgO.SiO formed by forsterite 2 The solid phase melting point is 1890 ℃, so that the scouring and erosion of molten steel can be effectively resisted, and the service life of the product is ensured.
(2) The magnesia material is used for the sewer brick, so that the production process requirements of the cord steel can be well met, and the purity of molten steel is improved.
Drawings
FIG. 1 is a schematic diagram of a carbon-free magnesia-based nozzle brick structure of the invention;
fig. 2 is a physical diagram of a carbon-free magnesia-based down nozzle brick product of the invention.
Detailed Description
The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
As shown in fig. 1 and 2, the carbon-free magnesia-based down nozzle brick comprises the following components in percentage by weight: 50-65% of forsterite particles, 5-15% of quartz sand particles and 30-35% of co-milled powder, wherein the total percentage is 100%; 4.0 to 4.8 percent of phenolic resin bonding agent (accounting for the total weight of the forsterite particles, the quartz sand particles and the co-grinding powder) is added; wherein the co-grinding powder is prepared by uniformly mixing 12% -25% of forsterite fine powder, 5% -7% of metal silicon powder, 4% of silicon carbide fine powder and 1% -4% of defatted aluminum powder; the forsterite particles are treated as follows: stirring forsterite particles and a coating agent solution, wherein the ratio of the coating agent added is 0.5-1.5% based on the total mass of the forsterite particles; the main component of the coating agent is nano silicon dioxide, the coating agent solution is alkalescent (pH is 7-8), the coating temperature is 25-40 ℃, and the stirring time is 2-4 hours, so as to obtain forsterite particles with the surfaces coated with the silicon dioxide.
Because the surface of the metal aluminum powder is provided with a layer of stearic acid film after the production is finished, the activity of the metal aluminum powder is affected; the degreasing aluminum powder (commercial products such as products of Chang vibrating leaf chemical industry company) used in the invention is prepared by removing a stearic acid film on the surface of the metal aluminum powder by a certain method, so as to improve the chemical activity of the aluminum powder.
Further, the particle size of the forsterite particles is (5-3, 3-1, 1-0) mm, and the weight percentages of the particle sizes are as follows: 25% of forsterite particles with the particle size of 5-3 mm, 15% of forsterite particles with the particle size of 3-1 mm and 20% of forsterite particles with the particle size of 1-0 mm; the forsterite particles comprise the following chemical components in percentage by weight: mgO content is 38% -47%, siO 2 The content of (2) is 39-44%, fe 2 O 3 The content of (2) is 7% -11%.
Further, the particle size of the quartz sand particles is (2-1, 1-0) mm, and the particle sizes are heavyThe weight percentages are as follows: 2.5% of quartz sand particles with the particle size of 2-1 mm and 2.5% of quartz sand particles with the particle size of 1-0 mm; the quartz sand particles comprise the following chemical components in percentage by weight: siO (SiO) 2 The content of (C) is more than or equal to 99 percent, and the volume density is more than or equal to 2.6g/cm 3 。
Further, the particle size of the forsterite fine powder is 0-2 mu m; the content of MgO in the forsterite fine powder is 37% -46%, and SiO is the material 2 The content of (3) is 38-44%, fe 2 O 3 The content of (2) is 8-12%.
Further, in the metal silicon powder: si content is more than or equal to 99.0%, fe 2 O 3 The content of SiO is less than or equal to 0.2 percent 2 The content of free silicon is less than or equal to 0.1 percent and the content of free silicon is less than or equal to 0.4 percent.
Further, in the silicon carbide fine powder: the content of SiC is more than or equal to 94.5 percent, fe 2 O 3 The content of SiO is less than or equal to 0.4 percent 2 The content of free carbon is less than or equal to 0.6 percent, the content of free silicon is less than or equal to 0.5 percent, and the content of free silicon is less than or equal to 0.6 percent.
Further, in the defatted aluminum powder: al content is more than or equal to 79%, fe 2 O 3 The content of Al+Si2 is not more than 0.2 percent, the content of Cu is not more than 99 percent, and the content of Cu is not more than 0.1 percent.
Example 1
The preparation method of the carbonless magnesia runner brick added with the forsterite comprises the following steps:
step S101: co-grinding preparation: uniformly mixing forsterite fine powder, metal silicon powder, silicon carbide fine powder and defatted aluminum powder according to the weight percentage to prepare co-milled powder;
step S102: and (3) preparing particles: uniformly mixing forsterite particles with the particle size of 5-3 mm, forsterite particles with the particle size of 3-1 mm, forsterite particles with the particle size of 1-0 mm, quartz sand particles with the particle size of 2-1 mm and quartz sand particles with the particle size of 1-0 mm according to the weight percentage to obtain a particle aggregate;
step S103: mixing: stirring the granular aggregate for 2 minutes by using a sand mixer, then adding a quantitative phenolic resin binder, wet-mixing for 9 minutes, adding co-milled powder, and rolling for 35 minutes to obtain a mixed pug;
step S104: and (3) forming: pressing and forming the mixed pug on a 630t electric spiral brick press to obtain an embryo brick;
step S105: and (3) drying: placing the green bricks into a natural gas drying kiln for drying, wherein the initial kiln feeding temperature is 35 ℃, and drying for more than 2 hours at the initial kiln feeding temperature; raising the temperature to 100 ℃ and drying at the temperature for more than 8 hours; heating to 220 deg.c and drying for over 14 hr;
step S106: the shell is as follows: the steel shell is buckled on a water gap of the smeared fireclay, and is reversely placed into a tool, and the steel shell is matched with the assembly size by a reverse pressing method;
step S107: and (3) drying: drying at 150deg.C for more than 6 hr to harden the fire clay;
step S108: and (3) packaging: and (5) packaging after inspection to obtain a finished product.
Example 2
The carbon-free magnesia-based nozzle brick added with forsterite in this example has the following composition and weight percentage according to the formula shown in table 1, and the preparation method is the same as in example 1.
Example 3
The carbon-free magnesia-based nozzle brick added with forsterite in this example has the following composition and weight percentage according to the formula shown in table 1, and the preparation method is the same as in example 1.
Example 4
The carbon-free magnesia-based nozzle brick added with forsterite in this example has the following composition and weight percentage according to the formula shown in table 1, and the preparation method is the same as in example 1.
Table 1 granule type and percentage of ingredients used in each example of the present invention
Performance test was performed on the carbon-free magnesium-based sewer bricks added with forsterite prepared in the above examples. Table 2 shows the physicochemical properties and average service life parameters of the forsterite-added carbon-free magnesia-based nozzle bricks obtained in examples 1 to 4 and the conventional high alumina bauxite-based nozzle bricks.
TABLE 2 physicochemical Properties and average Life parameters
As can be seen from Table 2, the carbon-free magnesia-down nozzle brick added with forsterite is tried on a steel cord steel production ladle, after the test is finished, analysis of erosion, reaming, cracking, molten steel cleanliness and the like is carried out on the carbon-free magnesia-down nozzle brick added with forsterite and the existing high bauxite-down nozzle brick, and the service life is prolonged to 2-3 times/block. Compared with the existing product, the erosion rate of the carbon-free magnesia-based nozzle brick added with the forsterite is obviously reduced compared with that of the existing high-alumina bauxite-based nozzle brick through measurement and analysis. The product is mainly applied to reaming of the used water gap brick, and the aperture is increased from 60mm to 62mm after the product is used for 2-3 times of offline, compared with the aperture which is increased to 65mm after the bauxite is used for 1 time of offline.
Meanwhile, the Al content in the molten steel is detected, and W in the molten steel is obtained after steel making by using the high-alumina bauxite-based water outlet brick Al The content is 0.0042%, which is far beyond the requirement of the national/industry standard below 0.003%. W in molten steel after steelmaking using the products of examples 1 to 4 Al The content is 0.0021% at most and 0.0011% at most, thereby ensuring the cleanliness of molten steel and providing a basis for producing high-quality cord steel. Therefore, the carbon-free magnesia runner brick added with forsterite has the effect of greatly improving the cleanliness of molten steel while having long service life.
Claims (8)
1. A carbon-free magnesia runner brick is used for producing cord steel and is characterized by comprising the following components in percentage by weight: 50-65% of forsterite particles, 5-15% of quartz sand particles, 30-35% of co-milled powder and 100% of total percentage; adding 4.0 to 4.8 percent of phenolic resin binder; wherein the co-grinding powder is prepared by uniformly mixing 12% -25% of forsterite fine powder, 5% -7% of metal silicon powder, 4% of silicon carbide fine powder and 1% -4% of defatted aluminum powder; the forsterite particles are treated as follows: stirring forsterite particles and a coating agent solution, wherein the weight percentage of the coating agent added is 0.5-1.5% based on the total mass of the forsterite particles; the main component of the coating agent is nano silicon dioxide, the coating agent solution is alkalescent, the coating temperature is 25-40 ℃, and the stirring time is 2-4 hours, so as to obtain forsterite particles with the surfaces coated with the silicon dioxide.
2. The carbonless magnesia runner brick of claim 1, wherein the forsterite particles have a particle size of 5-3 mm, 3-1 mm, 1-0 mm, wherein the weight percentages of the particle sizes are: 10-15% of forsterite particles with the particle size of 5-3 mm, 25-35% of forsterite particles with the particle size of 3-1 mm and 15-25% of forsterite particles with the particle size of 1-0 mm; the forsterite particles comprise the following chemical components in percentage by weight: mgO content is 38% -47%, siO 2 The content of (2) is 39-44%, fe 2 O 3 The content of (2) is 7% -11%, and the total percentage is 100%.
3. The carbon-free magnesia runner brick of claim 1, wherein the particle size of the quartz sand particles comprises two types of 2-1 mm and 1-0 mm, and the weight percentages of the particle sizes are as follows: 3% -8% of quartz sand particles with the particle size of 2-1 mm and 3% -8% of quartz sand particles with the particle size of 1-0 mm; the quartz sand particles comprise the following chemical components in percentage by weight: siO (SiO) 2 The content of (C) is more than or equal to 99 percent, and the volume density is more than or equal to 2.6g/cm 3 。
4. The carbon-free magnesia-based sewer brick of claim 1, wherein the particle size of the forsterite powder is 0-2 μm; the content of MgO in the forsterite fine powder is 37% -46%, and SiO is the material 2 The content of (3) is 38-44%, fe 2 O 3 The content of (2) is 8% -12%, and the total percentage is 100%.
5. The carbon-free magnesium-based sewer brick of claim 1, wherein in the metal silicon powder: si content is more than or equal to 99.0 percent,Fe 2 O 3 the content of SiO is less than or equal to 0.2 percent 2 The content of free silicon is less than or equal to 0.1 percent and the content of free silicon is less than or equal to 0.4 percent.
6. The carbon-free magnesium-based sewer nozzle block of claim 1, wherein, in the silicon carbide fine powder: the content of SiC is more than or equal to 94.5 percent, fe 2 O 3 The content of SiO is less than or equal to 0.4 percent 2 The content of free carbon is less than or equal to 0.6 percent, the content of free silicon is less than or equal to 0.5 percent, and the content of free silicon is less than or equal to 0.6 percent.
7. The carbon-free magnesium-based sewer brick according to claim 1, wherein in the defatted aluminum powder: the content of Al is more than or equal to 99 percent, the content of Fe is less than or equal to 0.2 percent, the content of Si is less than or equal to 0.2 percent, and the content of Cu is less than or equal to 0.1 percent.
8. A method of producing a carbon-free magnesium-based sewer nozzle block according to any of claims 1 to 7, characterized by the steps of:
step S101: co-grinding preparation: uniformly mixing forsterite fine powder, metal silicon powder, silicon carbide fine powder and defatted aluminum powder according to the weight percentage to prepare co-milled powder;
step S102: and (3) preparing particles: uniformly mixing forsterite particles with the particle size of 5-3 mm, forsterite particles with the particle size of 3-1 mm, forsterite particles with the particle size of 1-0 mm, quartz sand particles with the particle size of 2-1 mm and quartz sand particles with the particle size of 1-0 mm according to the weight percentage to obtain a particle aggregate;
step S103: mixing: stirring the granular aggregate for 2-4 minutes by using a sand mixer, then adding a phenolic resin binder, wet-mixing for 8-9 minutes, adding co-milled powder, and rolling for 25-35 minutes to obtain a mixed pug;
step S104: and (3) forming: pressing and forming the mixed pug on a 630t electric spiral brick press to obtain an embryo brick;
step S105: and (3) drying: placing the green bricks into a natural gas drying kiln for drying, wherein the initial kiln feeding temperature is 35 ℃, and drying for more than 2 hours at the initial kiln feeding temperature; raising the temperature to 100 ℃ and drying at the temperature for more than 8 hours; heating to 220 deg.c and drying for over 14 hr;
step S106: the shell is as follows: the steel shell is buckled on a water gap of the smeared fireclay, and is reversely placed into a tool, and the steel shell is matched with the assembly size by a reverse pressing method;
step S107: and (3) drying: drying at 150deg.C for more than 6 hr to harden the fire clay;
step S108: and (3) packaging: and (5) packaging after inspection to obtain a finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310107105.6A CN115974541B (en) | 2023-01-30 | 2023-01-30 | Carbon-free magnesium sewer nozzle brick and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310107105.6A CN115974541B (en) | 2023-01-30 | 2023-01-30 | Carbon-free magnesium sewer nozzle brick and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115974541A CN115974541A (en) | 2023-04-18 |
| CN115974541B true CN115974541B (en) | 2023-12-22 |
Family
ID=85963165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310107105.6A Active CN115974541B (en) | 2023-01-30 | 2023-01-30 | Carbon-free magnesium sewer nozzle brick and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115974541B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584278A (en) * | 2012-01-12 | 2012-07-18 | 浙江铭德新材科技有限公司 | Forsterite seating brick and production method of forsterite seating brick |
| CN103787681A (en) * | 2014-02-14 | 2014-05-14 | 唐山市国亮特殊耐火材料有限公司 | Tundish diffuse type air brick and preparation method thereof |
| CN107382334A (en) * | 2017-06-28 | 2017-11-24 | 常州禾吉纺织品有限公司 | A kind of ladle magnesium zirconium draining ageng and preparation method thereof |
| CN114163228A (en) * | 2021-12-30 | 2022-03-11 | 马鞍山利尔开元新材料有限公司 | Slag-stopping sliding plate of aluminum-calcium-carbon converter and preparation method thereof |
-
2023
- 2023-01-30 CN CN202310107105.6A patent/CN115974541B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584278A (en) * | 2012-01-12 | 2012-07-18 | 浙江铭德新材科技有限公司 | Forsterite seating brick and production method of forsterite seating brick |
| CN103787681A (en) * | 2014-02-14 | 2014-05-14 | 唐山市国亮特殊耐火材料有限公司 | Tundish diffuse type air brick and preparation method thereof |
| CN107382334A (en) * | 2017-06-28 | 2017-11-24 | 常州禾吉纺织品有限公司 | A kind of ladle magnesium zirconium draining ageng and preparation method thereof |
| CN114163228A (en) * | 2021-12-30 | 2022-03-11 | 马鞍山利尔开元新材料有限公司 | Slag-stopping sliding plate of aluminum-calcium-carbon converter and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 中间包镁橄榄石座砖的研制;严培忠 等;《世界钢铁》;第12卷(第4期);第22-25页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115974541A (en) | 2023-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108863414B (en) | High-performance magnesia carbon brick and preparation method thereof | |
| CN101503302B (en) | Carboneous fire-resistant material for furnace brick lining and preparation thereof | |
| CN110790567A (en) | Al addition4SiC4Slag-stopping sliding plate brick of ternary non-oxide converter and preparation method thereof | |
| CN106518043A (en) | Preparing method of low-cost Al-Ca-Si tin bath bottom block | |
| EP4349797A1 (en) | Ca6-based refractory material with medium volume density, preparation method therefor, and use thereof | |
| CN113233908A (en) | Regenerated carbon-free brick and preparation method thereof | |
| CN101439976A (en) | Composition for making submerged nozzle | |
| CN106220206A (en) | A kind of castable | |
| CN103121849B (en) | Ferrosilicon-added slide plate refractory material and production method thereof | |
| CN115974541B (en) | Carbon-free magnesium sewer nozzle brick and preparation method thereof | |
| CN109279906A (en) | A kind of castable and preparation method thereof | |
| CN1298465C (en) | Bottom fire-proof material of large steel ladle | |
| CN114873996B (en) | Slag-corrosion-resistant ladle castable and preparation method thereof | |
| CN114644512B (en) | Erosion-resistant submerged nozzle for continuous casting of special steel and preparation method thereof | |
| CN112759381B (en) | Carbon-free ladle down nozzle and preparation method thereof | |
| CN110615670A (en) | High-performance magnesium sliding brick and preparation method thereof | |
| CN113416060A (en) | Magnesium-calcium dry vibration material for continuous casting tundish and preparation method thereof | |
| WO2010023813A1 (en) | Method for manufacturing silicon nitride-bonded sic refractory material | |
| JP3327883B2 (en) | Refractories containing massive graphite | |
| CN111113634A (en) | Combined plate blank continuous casting tundish turbulence controller and preparation method thereof | |
| CN106747517B (en) | Prefabricated brick, preparation method thereof and trolley breast board of circular cooler | |
| CN105665692B (en) | A kind of long nozzle anti-thermal shock liner complex and its preparation process | |
| CN116283315B (en) | Carbon-free inorganic pressed spinel sliding plate brick and preparation method thereof | |
| CN116655356B (en) | Low-carbon magnesia-zirconia-carbon converter sliding brick and preparation method thereof | |
| EP2695868B1 (en) | Refractory material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |