CN111484348A - Mullite fiber toughened Al for blast furnace tapping channel2O3-SiC-C refractory castable and preparation method thereof - Google Patents
Mullite fiber toughened Al for blast furnace tapping channel2O3-SiC-C refractory castable and preparation method thereof Download PDFInfo
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- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 57
- 239000000835 fiber Substances 0.000 title claims abstract description 56
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 13
- 239000010703 silicon Substances 0.000 claims abstract description 13
- 239000010426 asphalt Substances 0.000 claims abstract description 12
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 18
- 229910052593 corundum Inorganic materials 0.000 claims description 15
- 239000000523 sample Substances 0.000 claims description 14
- 239000010431 corundum Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000009970 fire resistant effect Effects 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 229910052742 iron Inorganic materials 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052582 BN Inorganic materials 0.000 description 5
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003094 microcapsule Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- OJMOMXZKOWKUTA-UHFFFAOYSA-N aluminum;borate Chemical compound [Al+3].[O-]B([O-])[O-] OJMOMXZKOWKUTA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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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
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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Abstract
The invention discloses mullite fiber toughened Al for a blast furnace tapping channel2O3The method comprises the steps of firstly pouring 55-65 parts by mass of brown fused alumina, 20-30 parts by mass of silicon carbide, 0.3-0.9 part by mass of mullite fiber and 1-3 parts by mass of spherical asphalt into a stirrer, stirring for 10-20 minutes, then pouring 6-10 parts by mass of α -alumina micropowder, 2-4 parts by mass of pure calcium aluminate cement, 0.5-1.5 parts by mass of silicon micropowder and 0.05-0.15 part by mass of a water reducer, stirring uniformly, and obtaining the Al-toughened mullite fiber Al-toughened alumina for blast furnace tapping runners2O3-SiC-C refractory castable. The invention has simple process and wide raw material source, and the prepared mullite fiber toughened Al for the blast furnace tapping channel2O3Strength of-SiC-C refractory castableHigh thermal shock stability.
Description
Technical Field
The invention relates to the technical field of refractory castable, in particular to mullite fiber toughened Al for a blast furnace tapping channel2O3-SiC-C refractory castable and a preparation method thereof.
Background
With the continuous progress of blast furnace metallurgical technology, the blast furnace gradually develops towards large-scale and long-life; and in the present day with increasingly intense market competition, the tapping time is longer, and the higher molten iron flow rate is the inevitable development direction of the tapping runner. Al for blast furnace tapping channel2O3the-SiC-C castable is easy to damage due to long-term erosion by slag and molten iron and unstable working condition temperature, and the quality of the molten iron is seriously influenced. Therefore, the Al for the blast furnace tapping channel with excellent strength and good thermal shock stability is prepared2O3the-SiC-C refractory castable is imminent.
The patent technology of 'a boron nitride enhanced iron runner material' (CN105777146A) discloses a boron nitride enhanced iron runner material prepared from brown corundum, silicon carbide, silicon oxide micro powder, hexagonal boron nitride, Si micro powder, graphite and other raw materials. The method improves the slag corrosion resistance and the thermal shock stability of the iron runner material to a certain extent. But its main drawbacks are: (1) the addition amount of hexagonal boron nitride is large, which results in high production cost. (2) As the hexagonal boron nitride is oxidized at 900 ℃ to generate boron oxide and reacts with the alumina in the material to generate aluminum borate, the phenomena of cracking and the like of the iron runner material are easily caused by volume expansion in the process.
A technology for preparing the refractory material for iron runner (CN101481254) features that the aggregate, alumina clinker, SiC, α alumina powder, graphite, metallic silicon, alumina clinker powder and the waste powder from iron and steel works are used as raw materials, and liquid resin is then added to obtain said refractory material.
' A whisker-reinforced Al2O3The patent technology of the-SiC-C iron runner castable and the preparation method thereof (CN110240486A) discloses a method for preparing whisker reinforced Al by taking 45-65 wt% of corundum aggregate, 15-35 wt% of silicon carbide, 2-4 wt% of carbon black, 2-10 wt% of metal aluminum powder/ceramic membrane microcapsule, 4-6 wt% of α -alumina powder, 2-4 wt% of silica powder and 4-6 wt% of calcium aluminate cement as raw materials and adding 0.1-0.3 wt% of catalyst and 0.1-0.3 wt% of water reducer2O3-SiC-C iron runner castable. The method optimizes Al to a certain extent2O3Erosion resistance and thermal shock resistance of the-SiC-C castable. But its main drawbacks are: mullite fiber toughened Al2O3The production process of the-SiC-C refractory castable is extremely complex and has higher cost: putting the metal aluminum powder into pressurized water vapor, and keeping for 10-35 min to prepare the metal aluminum powder with corroded surface; placing the metal aluminum powder with the corroded surface in alkaline silica sol for 10-60 min to obtain mixed slurry; and then carrying out vacuum filtration, roasting for 2-8 hours at 500-700 ℃ to obtain metal aluminum powder @ ceramic membrane microcapsules, and generating the mullite fiber toughened refractory castable material by utilizing an in-situ reaction. In addition, the aspect ratio of the whiskers and the fibers cannot be effectively controlled by the method.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide mullite fiber toughened Al for a blast furnace tapping channel2O3Preparation method of-SiC-C refractory castable and mullite fiber toughened Al for blast furnace tapping channel prepared by using preparation method2O3the-SiC-C refractory castable has high strength and good thermal shock stability, and the length and diameter of the whisker and the fiber can be effectively controlled.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
mullite fiber toughened Al for blast furnace tapping channel2O3The preparation method of the-SiC-C refractory castable comprises the following steps of 55-65 partsThe method comprises the following steps of taking brown corundum, 20-30 parts by mass of silicon carbide, 6-10 parts by mass of α -alumina micropowder, 2-4 parts by mass of pure calcium aluminate cement as raw materials, and taking 0.3-0.9 part by mass of mullite fiber, 0.5-1.5 parts by mass of silicon micropowder, 1-3 parts by mass of spherical asphalt and 0.05-0.15 part by mass of water reducing agent as additives, wherein the method specifically comprises the following steps:
1) according to the mass parts, firstly pouring brown corundum, silicon carbide, mullite fiber and spherical asphalt into a stirrer, and stirring for 10-20 minutes;
2) then α -alumina micro powder, pure calcium aluminate cement, silicon micro powder and water reducing agent are poured into the mixture to be stirred, and the mixture is uniformly stirred to obtain mullite fiber toughened Al for blast furnace tapping runners2O3-SiC-C refractory castable.
Further, Al in brown corundum2O3The content is more than or equal to 95 wt%; the grain composition of brown corundum is: the particle size range of 30-35 wt% is 5-8 mm, the particle size range of 27-33 wt% is 3-5 mm, and the particle size range of 35-40 wt% is 1-3 mm.
Further, the SiC content in the silicon carbide is more than or equal to 97 wt%; the grain composition of the silicon carbide is: 45-51 wt% of the powder with the particle size range of 0.075-1 mm, 24-31 wt% of the powder with the particle size range of 0.044-0.075 mm, and 21-25 wt% of the powder with the particle size range of 0-0.044 mm.
Furthermore, the grain size of the α -alumina micro powder is less than or equal to 0.005 mm.
Furthermore, the mullite fiber is a mullite chopped fiber with the length of 1-3 mm and the diameter of 0.003-0.015 mm.
Furthermore, the grain size of the silicon micropowder is less than or equal to 0.045 mm.
Furthermore, the grain diameter of the spherical asphalt is less than or equal to 0.1 mm.
Mullite fiber toughened Al for blast furnace tapping channel prepared by the preparation method2O3-SiC-C refractory castable.
The mullite fiber toughens Al2O3Application of-SiC-C refractory castable in preparation of blast furnace tapping runners.
Further, the blast furnace tapping channel comprises a main channel body,a permanent refractory layer, an external mould insulating layer and a main channel body made of Al2O3The SiC-C refractory castable is poured, a groove is formed in the main groove body, two side faces of the main groove body are respectively provided with a skirt edge, and the outer edge of the skirt edge is provided with a convex block which is matched with a groove on the outer membrane heat-insulating layer; the permanent fire-resistant layer is arranged between the main groove body and the outer mold heat-insulating layer; a cooling water pipeline is inserted into the outer mold heat insulation layer in a penetrating way, and a leakage-proof safety layer is arranged outside the cooling water pipeline; the outer wall of the permanent fire-resistant layer and the outer wall of the outer mold heat-insulating layer at the corresponding position are provided with temperature probes, probe protective sleeves are arranged outside the temperature probes, and the outer wall of the outer mold heat-insulating layer is also provided with a water vapor pressure sensor.
Has the advantages that: compared with the prior art, the invention has the advantages that:
1) the invention adopts mullite chopped fiber with the length of 1-3 mm and the diameter of 0.003-0.015 mm as a reinforcing agent to be added into Al for a blast furnace tapping channel2O3-SiC-C refractory castable. The mullite chopped fiber has the characteristics of corrosion resistance, high modulus, high temperature resistance, oxidation resistance and the like, and has good effects of inhibiting the diffusion of cracks in the matrix and promoting the oxidation resistance of the matrix. In addition, Al for blast furnace tapping channel due to interfacial debonding effect and fiber extraction effect of mullite chopped fiber in matrix2O3the-SiC-C castable plays a role in toughening and reinforcing;
2) the mullite fiber toughened Al for the blast furnace tapping channel prepared by the invention2O3The normal-temperature breaking strength of the-SiC-C refractory castable product after heat treatment at 1450 ℃ for × 3 hours is 15-19 MPa, the strength retention rate is 66-77% after heat shock and water cooling at 1100 ℃ for 5 times, and the Al content is remarkably improved2O3Strength and thermal shock stability of the-SiC-C refractory castable;
3) in the prior art, the mullite whiskers or mullite fibers are mainly generated in situ by adding a reaction material, the length-diameter ratio of the whiskers or fibers cannot be effectively controlled, and the whiskers or fibers generated by the in-situ reaction are difficult to grow to the length of 1-3 mm.
Drawings
FIG. 1 is a schematic view showing the structure of a blast furnace tapping runner in example 4;
FIG. 2 shows mullite fiber toughened Al prepared by the present invention2O3A material characterization diagram of the-SiC-C refractory castable.
Detailed Description
The invention is further described with reference to specific examples.
In order to avoid repetition, the raw materials and additives used in this embodiment are described below in a unified manner, and are not further described in the examples.
Al in brown corundum2O3The content is more than or equal to 95 wt%; the grain composition of brown corundum is: the particle size range of 30-35 wt% is 5-8 mm, the particle size range of 27-33 wt% is 3-5 mm, and the particle size range of 35-40 wt% is 1-3 mm.
Further, the SiC content in the silicon carbide is more than or equal to 97 wt%; the grain composition of the silicon carbide is: 45-51 wt% of the powder with the particle size range of 0.075-1 mm, 24-31 wt% of the powder with the particle size range of 0.044-0.075 mm, and 21-25 wt% of the powder with the particle size range of 0-0.044 mm.
Furthermore, the grain size of the α -alumina micro powder is less than or equal to 0.005 mm.
Furthermore, the mullite fiber is a mullite chopped fiber with the length of 1-3 mm and the diameter of 0.003-0.015 mm.
Furthermore, the grain size of the silicon micropowder is less than or equal to 0.045 mm.
Furthermore, the grain diameter of the spherical asphalt is less than or equal to 0.1 mm.
Example 1
Mullite fiber toughened Al for blast furnace tapping channel2O3The preparation method of the-SiC-C refractory castable comprises the following steps of taking 62-65 parts by mass of brown fused alumina, 20-24 parts by mass of silicon carbide, 9-10 parts by mass of α -alumina micropowder and 3-4 parts by mass of pure calcium aluminate cement as raw materials, and taking 0.8-0.9 part by mass of mullite fiber, 0.5-1.5 parts by mass of silicon micropowder, 1-3 parts by mass of spherical asphalt and 0.05 ℃0.15 parts by mass of a water reducing agent is taken as an additive, and the method specifically comprises the following steps:
1) according to the mass parts, firstly pouring brown corundum, silicon carbide, mullite fiber and spherical asphalt into a stirrer, and stirring for 10-20 minutes;
2) then α -alumina micro powder, pure calcium aluminate cement, silicon micro powder and water reducing agent are poured into the mixture to be stirred, and the mixture is stirred evenly to obtain mullite fiber toughened Al for blast furnace tapping channel2O3-SiC-C refractory castable.
Mullite fiber toughened Al for blast furnace tapping channel prepared in the embodiment 12O3The strength retention rate of the-SiC-C refractory castable product at room temperature after heat treatment at 1450 ℃ for × 3 hours is 15-17 MPa, and the strength retention rate at 1100 ℃ for 5 times of heat shock and water cooling is 66-69%.
Example 2
The procedure of example 1 was followed, except for the following technical parameters.
Mullite fiber toughened Al for blast furnace tapping channel2O3The preparation method of the-SiC-C refractory castable comprises the following steps of taking 58-62 parts by mass of brown fused alumina, 24-27 parts by mass of silicon carbide, 7-9 parts by mass of α -alumina micropowder, and 2.5-3 parts by mass of pure calcium aluminate cement as raw materials, and taking 0.6-0.8 part by mass of mullite fiber, 0.5-1.5 parts by mass of silicon micropowder, 1-3 parts by mass of spherical asphalt and 0.05-0.15 part by mass of water reducing agent as additives.
Mullite fiber toughened Al for blast furnace tapping channel prepared in the embodiment 22O3The strength retention rate of the-SiC-C refractory castable product at room temperature after heat treatment at 1450 ℃ for × 3 hours is 16-18 MPa, and the strength retention rate is 68-72% after heat shock and water cooling at 1100 ℃ for 5 times.
Example 3
The procedure of example 1 was followed, except for the following technical parameters.
Mullite fiber toughened Al for blast furnace tapping channel2O3The preparation method of the-SiC-C refractory castable comprises the following steps of taking 55-58 parts by mass of brown fused alumina, 27-30 parts by mass of silicon carbide, 6-7 parts by mass of α -alumina micropowder and 2-2.5 parts by mass of pure calcium aluminate cement as raw materials, and taking 0.3-0.6 part by mass of pure calcium aluminate cementThe additive comprises mullite fiber, 0.5-1.5 parts by mass of silicon micropowder, 1-3 parts by mass of spherical asphalt and 0.05-0.15 part by mass of water reducing agent.
Mullite fiber toughened Al for blast furnace tapping channel prepared in the embodiment 32O3The strength retention rate of the-SiC-C refractory castable product at room temperature after heat treatment at 1450 ℃ for × 3 hours is 17-19 MPa, and the strength retention rate is 72-77% after heat shock and water cooling at 1100 ℃ for 5 times.
Example 4
Mullite fiber toughened Al prepared by using the above examples2O3the-SiC-C refractory castable material is applied to preparing a blast furnace tapping channel and comprises a main channel body 1, a permanent refractory layer 2 and an outer mold insulating layer 3, wherein the main channel body 1 is made of Al2O3The SiC-C refractory castable is poured, a groove 4 is arranged in the SiC-C refractory castable, two side faces of the main groove body 1 are respectively provided with a skirt edge 5, and the outer edge of the skirt edge 5 is provided with a convex block 6 which is matched with a groove on the outer membrane heat-insulating layer 3; the permanent fire-resistant layer 2 is arranged between the main ditch body 1 and the outer mold heat-insulating layer 3; a cooling water pipeline 7 is inserted into the outer mold heat-insulating layer 3 in a penetrating manner, a leakage-proof safety layer 8 is arranged outside the cooling water pipeline 7 to be used as protection, and the leakage-proof safety layer 8 is made of metal ceramics, so that the detection devices arranged nearby are prevented from being damaged due to the leakage of cold water, and the accuracy of the detection devices is prevented from being influenced; the temperature probes 9 are respectively and uniformly arranged on the outer side wall and the bottom wall of the permanent refractory layer 2 and the outer layer inner wall of the outer mold heat-insulating layer 3 at the corresponding positions, the probe protective sleeve 10 is arranged outside the temperature probes 9, the protective sleeve can play roles of preventing abrasion and breakage at the joint of the connecting lead and the probe body, and meanwhile, the influence of cold water and vapor on the detection of the temperature probes is avoided again; the outer inner wall of the outer mold heat-insulating layer 3 is also provided with a water vapor pressure sensor 11, and the water vapor pressure sensors 11 are uniformly arranged on the outer inner side wall and the bottom wall of the outer mold heat-insulating layer 3; the temperature probe 9 and the pressure sensor 11 are respectively connected with a control system, and the control system judges the cooling effect according to the temperature difference detected by the temperature probe on the outer wall of the permanent fire-resistant layer and the temperature probe on the inner wall of the outer layer of the outer mold heat-insulating layer and controls the flow of cooling water; meanwhile, the control system evaluates the water vapor pressure in the closed space according to the pressure value of the water vapor pressure sensor.
The shape of the inner wall surface of the groove 4 is semicircular, U-shaped or V-shaped, which is beneficial for smooth passing of iron slag, and the size of the groove can be designed adaptively according to the specific size and structure of the blast furnace tapping channel.
The mullite fiber has the characteristics of corrosion resistance, high modulus, high temperature resistance, oxidation resistance and the like, and has good effects of inhibiting the diffusion of cracks in the matrix and promoting the oxidation resistance of the matrix. In addition, Al for blast furnace tapping channel due to the interfacial debonding effect and fiber pulling-out effect of mullite fiber in the matrix2O3the-SiC-C castable plays a role in toughening and reinforcing, and the probability that the conventional high-temperature tapping channel castable is easy to damage is reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. Mullite fiber toughened Al for blast furnace tapping channel2O3The preparation method of the-SiC-C refractory castable is characterized by taking 55-65 parts by mass of brown fused alumina, 20-30 parts by mass of silicon carbide, 6-10 parts by mass of α -alumina micropowder and 2-4 parts by mass of pure calcium aluminate cement as raw materials, and taking 0.3-0.9 part by mass of mullite fiber, 0.5-1.5 parts by mass of silicon micropowder, 1-3 parts by mass of spherical asphalt and 0.05-0.15 part by mass of water reducing agent as additives to prepare the mullite fiber toughened Al for the blast furnace tapping runner2O3the-SiC-C refractory castable specifically comprises the following steps:
1) according to the mass parts, firstly pouring brown corundum, silicon carbide, mullite fiber and spherical asphalt into a stirrer, and stirring for 10-20 minutes;
2) then α -alumina micro powder, pure calcium aluminate cement, silicon micro powder and water reducing agent are poured into the mixture to be stirred, and the mixture is uniformly stirred to obtain mullite fiber toughened Al for blast furnace tapping runners2O3-SiC-C refractory castable.
2. The mullite fiber-toughened Al for blast furnace tapping runners as claimed in claim 12O3The preparation method of the-SiC-C refractory castable is characterized in that Al in brown corundum2O3The content is more than or equal to 95 wt%; the grain composition of the brown corundum is as follows: the particle size range of 30-35 wt% is 5-8 mm, the particle size range of 27-33 wt% is 3-5 mm, and the particle size range of 35-40 wt% is 1-3 mm.
3. The mullite fiber-toughened Al for blast furnace tapping runners as claimed in claim 12O3The preparation method of the-SiC-C refractory castable is characterized in that the SiC content in the silicon carbide is more than or equal to 97 wt%; the grain composition of the silicon carbide is as follows: 45-51 wt% of the powder with the particle size range of 0.075-1 mm, 24-31 wt% of the powder with the particle size range of 0.044-0.075 mm, and 21-25 wt% of the powder with the particle size range of 0-0.044 mm.
4. The mullite fiber-toughened Al for blast furnace tapping runners as claimed in claim 12O3The preparation method of the-SiC-C refractory castable is characterized in that the grain size of the α -alumina micropowder is less than or equal to 0.005 mm.
5. The mullite fiber-toughened Al for blast furnace tapping runners as claimed in claim 12O3The preparation method of the-SiC-C refractory castable is characterized in that the mullite fiber is a mullite chopped fiber with the length of l-3 mm and the diameter of 0.003-0.015 mm.
6. The mullite fiber-toughened Al for blast furnace tapping runners as claimed in claim 12O3The preparation method of the-SiC-C refractory castable is characterized in that the grain size of the silicon micropowder is less than or equal to 0.045 mm.
7. The mullite fiber-toughened Al for blast furnace tapping runners as claimed in claim 12O3The preparation method of the-SiC-C refractory castable is characterized in that the grain size of the spherical asphalt is less than or equal to 0.1 mm.
8. Mullite fiber toughened Al for blast furnace tapping channel prepared by the method of any one of claims 1 to 72O3-SiC-C refractory castable.
9. Mullite fiber toughened Al as claimed in claim 82O3Application of-SiC-C refractory castable in preparation of blast furnace tapping runners.
10. Use according to claim 9, characterized in that the tapping runner comprises a main runner body (1), a permanent refractory layer (2), an outer mould insulation layer (3), the main runner body (1) being made of Al2O3The SiC-C refractory castable is poured, a groove (4) is arranged in the main groove body (1), two side faces of the main groove body (1) are respectively provided with a skirt edge (5), and the outer edge of the skirt edge (5) is provided with a convex block (6) which is matched with a groove on the outer membrane heat-insulating layer (3); the permanent fire-resistant layer (2) is arranged between the main trench body (1) and the outer mold insulating layer (3); a cooling water pipeline (7) is inserted into the outer mold heat-insulating layer (3), and a leakage-proof safety layer (8) is arranged outside the cooling water pipeline (7); the outer wall of the permanent fire-resistant layer (2) and the outer inner wall of the outer mold heat-insulating layer (3) in the corresponding position are provided with temperature probes (9), probe protective sleeves (10) are arranged outside the temperature probes (9), and the outer inner wall of the outer mold heat-insulating layer (2) is further provided with a water vapor pressure sensor (11).
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| CN114956839A (en) * | 2022-04-18 | 2022-08-30 | 南京联合荣大工程材料有限责任公司 | Baffle plate for skimmer and preparation method thereof |
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