CN116354706A - Aluminum-magnesium-chromium material fireclay and preparation method and application thereof - Google Patents
Aluminum-magnesium-chromium material fireclay and preparation method and application thereof Download PDFInfo
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- CN116354706A CN116354706A CN202310222691.9A CN202310222691A CN116354706A CN 116354706 A CN116354706 A CN 116354706A CN 202310222691 A CN202310222691 A CN 202310222691A CN 116354706 A CN116354706 A CN 116354706A
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- fireclay
- aluminum
- magnesium
- chromium material
- tundish
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- 239000000463 material Substances 0.000 title claims abstract description 60
- -1 Aluminum-magnesium-chromium Chemical compound 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 42
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 37
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 27
- 239000010431 corundum Substances 0.000 claims abstract description 27
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 25
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 241000276425 Xiphophorus maculatus Species 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 239000008187 granular material Substances 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000008188 pellet Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 30
- 229910000831 Steel Inorganic materials 0.000 abstract description 20
- 239000010959 steel Substances 0.000 abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 5
- 230000035515 penetration Effects 0.000 abstract description 4
- 239000011819 refractory material Substances 0.000 abstract description 4
- 238000010304 firing Methods 0.000 abstract description 3
- 238000001354 calcination Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 36
- 239000004927 clay Substances 0.000 description 10
- 238000009749 continuous casting Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 239000011449 brick Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 229920001353 Dextrin Polymers 0.000 description 5
- 239000004375 Dextrin Substances 0.000 description 5
- 235000019425 dextrin Nutrition 0.000 description 5
- 235000019832 sodium triphosphate Nutrition 0.000 description 5
- 229920005551 calcium lignosulfonate Polymers 0.000 description 4
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000011895 specific detection Methods 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- APLNAFMUEHKRLM-UHFFFAOYSA-N 2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]-1-(3,4,6,7-tetrahydroimidazo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CC2=C(CC1)N=CN2 APLNAFMUEHKRLM-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical group [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 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
- C04B35/101—Refractories from grain sized mixtures
- C04B35/105—Refractories from grain sized mixtures containing chromium oxide or chrome ore
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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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- C04B35/64—Burning or sintering processes
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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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- 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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- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The application relates to the field of refractory materials, and particularly discloses aluminum-magnesium-chromium material fireclay, a preparation method and application thereof. The aluminum-magnesium-chromium material fireclay comprises 55-75% of platy corundum, 0-20% of high aluminum bauxite clinker, 8-12% of fused magnesia, 1-3% of chrome green, 4-10% of ultrafine powder, 1-3% of sintering agent and 0.5-1% of additive. Mixing the raw materials to prepare aluminum-magnesium-chromium material fireclay with better comprehensive performance, and calcining at 1500 ℃ for 3 hours to obtain the fireclay with the normal-temperature flexural strength of more than 11 MPa; the normal temperature fracture-resistant bonding strength is above 3MPa, and the line change rate after firing is 0-0.5%. The aluminum-magnesium-chromium material fireclay is used for the split double-section water inlet of the tundish, fills in the joints of the split water inlet and the joints of the water inlet and the pocket block, reduces the problems of steel seepage, steel leakage, steel penetration and the like, and ensures that the service life of the tundish is more than 50 hours.
Description
Technical Field
The application relates to the field of refractory materials, in particular to aluminum-magnesium-chromium material fireclay, a preparation method and application thereof.
Background
The tundish is one of main equipment in continuous casting (hereinafter referred to as continuous casting for short), mainly receives molten steel in a smelting furnace, and then controls the flow of the molten steel to pour into a crystallizer through a tundish functional part, so that the continuous casting blank is stably and orderly pulled out. The slide block tundish is a type commonly used in the tundish, and mainly controls the amount of molten steel flowing into a crystallizer through a sizing water inlet and a slide block so as to control the pulling speed of a continuous casting blank.
Along with the rapid development of continuous casting technology, the sizing water inlet in the sliding block tundish is developed from a single-section water inlet to a split double-section water inlet, so that the total length of the zirconium core is increased, and the continuous casting is used under the condition that the pulling speed is more than 4.0 m/min. Because of adopting the split double-section water feeding port, the gap between the water feeding ports and the pocket blocks are filled with fireclay, so that the problems of steel seepage, steel leakage and steel penetration are avoided, and the service life of the tundish is further ensured.
At present, the common fireclay is high-aluminum material fireclay, which mainly comprises white corundum and high-aluminum bauxite clinker fine powder. When the pulling speed is above 4.0m/min and the continuous casting blank section of 165mm multiplied by 165mm is produced, after the gap is filled with high-aluminum material fireclay, the average service life of the tundish is about 30h, but the phenomenon that the steel is penetrated at the joint of the split water feeding port and the steel is penetrated at the joint of the water feeding port and the brick cup tends to occur, the service life of the tundish is severely restricted, and meanwhile, the large potential safety hazard is brought.
Therefore, a need exists for a fireclay with better overall properties to fill the joints of the water inlet and the brick cup, so as to improve the service life of the tundish.
Disclosure of Invention
In order to prolong the service life of the tundish, the application provides aluminum-magnesium-chromium material fireclay and a preparation method and application thereof.
In a first aspect, the application provides an aluminum-magnesium-chromium material fireclay, which comprises, by weight, 55-75% of plate-shaped corundum, 0-20% of high-alumina bauxite clinker, 8-12% of fused magnesia, 1-3% of chrome green, 4-10% of ultrafine powder, 1-3% of a sintering agent and 0.5-1% of an additive.
In the application, the aluminum-magnesium-chromium material fireclay with better comprehensive performance can be obtained through the mutual matching of the plate-shaped corundum, the high-aluminum bauxite clinker, the fused magnesia, the chrome green, the superfine powder, the sintering agent and the additive. The normal temperature flexural strength of the obtained aluminum-magnesium-chromium material fireclay is above 11MPa after the fireclay is calcined for 3 hours at 1500 ℃; the normal temperature fracture-resistant bonding strength is above 3MPa, and the line change rate after firing is 0-0.5%.
The aluminum-magnesium-chromium material fireclay obtained by the application is applied to the split double-section water inlet of the tundish, and in the use process, the fireclay shows micro-expansion to generate certain compressive stress, so that gaps between the water inlets and the brick cup are filled well. When the drawing speed is more than 4.0m/min and the section of a continuous casting blank with the thickness of 165mm multiplied by 165mm is produced, the service life of the tundish is more than 50 hours.
In one embodiment, the platy corundum is 65-75% and the bauxite chamotte is 10-20%.
Preferably, the plate-shaped corundum is 70% and the high alumina bauxite clinker is 15%.
In the application, with the increase of the proportion of the plate-shaped corundum and the high-alumina bauxite chamotte, the normal-temperature flexural strength and the normal-temperature flexural bond strength of the aluminum-magnesium-chromium material fireclay are improved, and the thermal shock stability of the fireclay is also improved. However, as the plate-shaped corundum and the high-alumina bauxite clinker are increased, the line change rate after burning is reduced, and the risks of steel seepage, steel leakage and steel penetration are increased.
The usage amount of the plate-shaped corundum and the high-alumina bauxite chamotte in the application not only affects the performance of the aluminum-magnesium-chromium material chamotte, but also affects the performance of the aluminum-magnesium-chromium material chamotte.
The plate-shaped corundum consists of 200-600 mu m granules and 200 meshes of fine powder, wherein the weight ratio of the granules to the fine powder is 1 (1-1.5); the grain diameter of the high alumina bauxite chamotte is 200-600 mu m.
Further preferably, the weight ratio of the pellet to the fine powder is 1:1.5.
In one embodiment, the fused magnesia is 10-12% and the chrome green is 2-3%.
Preferably, the fused magnesia is 12% and the chrome green is 3%.
In the application, the fused magnesia and the chrome green are added when the aluminum-magnesium-chromium material fireclay is prepared, so that the magnesia-alumina spinel and the magnesia-chromium spinel can be generated, the alkaline tundish slag resistance, the normal-temperature flexural strength and the normal-temperature flexural bonding strength of the fireclay are improved, the scouring of molten steel can be well resisted without being damaged, and the service life of the tundish is prolonged.
In the present application, the particle size of the fused magnesia is 200 meshes, and the particle size of the chrome green is 200 meshes.
In one embodiment, the ultra-fine powder is selected from alpha-Al 2 O 3 Fine powder and SiO 2 Fine powder.
In one embodiment, the α -Al 2 O 3 Fine powder and said SiO 2 The particle size of the fine powder is less than 2 μm.
In one embodiment, the sintering agent is a clay fines.
In one embodiment, the clay fines have a particle size of 200 to 325 mesh.
In one embodiment, the additive is a mixture of calcium lignosulfonate, dextrin, and sodium tripolyphosphate.
Preferably, the weight ratio of the calcium lignosulfonate, the dextrin and the sodium tripolyphosphate is 1 (0.5-1.5) to 0.8-1.2.
More preferably, the weight ratio of the calcium lignosulfonate, the dextrin and the sodium tripolyphosphate is 1:1:1.
Ultrafine powder, sintering agent and additive are added into the aluminum-magnesium-chromium material fireclay, and the aluminum-magnesium-chromium material fireclay is used at the split double-section water inlet of the tundish, so that the combination property and stability of the fireclay between the water inlets and at the joint of the water inlet and the brick cup can be ensured. In addition, the superfine powder, the sintering agent and the additive are compounded with the platy corundum with the grain diameter of 200-600 mu m, so that the fireclay has better comprehensive performance, and the service life of the tundish is further prolonged.
In a second aspect, the application provides a preparation method of aluminum-magnesium-chromium material fireclay, which comprises the following steps,
(1) Premixing the superfine powder, the sintering agent and the additive to prepare premixed powder;
(2) And mixing the plate-shaped corundum, the high alumina bauxite clinker, the fused magnesia and the chrome green, then adding the premixed powder, continuously stirring and mixing for more than 15 minutes, and obtaining the aluminum-magnesium-chrome material fireclay.
In the application, firstly, adding ultrafine powder, a sintering agent and an additive into a double-cone stirrer for mixing to prepare premix; and mixing the plate-shaped corundum, the high-alumina bauxite clinker, the fused magnesia and the chrome green for 10-15min, adding the premix, and stirring and mixing for more than 15min to obtain the aluminum-magnesium-chrome material fireclay.
The aluminum-magnesium-chromium material fireclay needs to be mixed by adding water in the using process, and the weight ratio of the aluminum-magnesium-chromium material fireclay to the water is 1 (0.15-0.17).
In a third aspect, the present application provides the use of an aluminum magnesium chromium material fireclay for a tundish.
After the aluminum-magnesium-chromium material fireclay and water obtained by the method are mixed in proportion, the fireclay is applied to a tundish, particularly to a split double-section water inlet in a sliding block tundish, and can well fill the joints between the water inlets and the water inlet and the brick cup. When the drawing speed is more than 4.0m/min and the section of a continuous casting blank with the thickness of 165mm multiplied by 165mm is produced, the service life of the slide block tundish is more than 50 hours.
In summary, the present application has the following beneficial effects:
1. the method adopts the mutual matching of plate-shaped corundum, high alumina bauxite clinker, fused magnesia, chrome green, superfine powder and other raw materials, and the obtained aluminum-magnesium-chrome material fireclay has the normal temperature flexural strength of more than 11MPa after being calcined for 3 hours at 1500 ℃; the normal temperature fracture-resistant bonding strength is above 3MPa, and the line change rate after firing is 0-0.5%;
2. the aluminum-magnesium-chromium material fireclay obtained by the method has better comprehensive performance and certain micro-expansion, and is used at a split double-section water inlet of a tundish, so that the problems of steel seepage, steel leakage and steel penetration are effectively avoided, and the service life of the tundish is longer than 50 hours;
3. the preparation method of the aluminum-magnesium-chromium material fireclay is simple, easy to control and capable of realizing batch production.
Detailed Description
The present application is described in further detail below with reference to examples.
Raw materials
The raw materials described in the present application are commercially available unless otherwise specified.
Examples
Example 1
The preparation of the aluminum-magnesium-chromium material fireclay comprises the following steps:
(1) Adding 0.45kg of the ultrafine powder, 0.1kg of the sintering agent and 0.05kg of the additive into a double-cone mixer for premixing to prepare 0.6kg of premixed powder;
wherein the superfine powder is alpha-Al 2 O 3 Fine powder with particle size of 2 μm;
wherein the sintering agent is clay fine powder with the particle size of 200 meshes;
wherein the additive is calcium lignosulfonate, dextrin and sodium tripolyphosphate, and the weight ratio of the dextrin to the sodium tripolyphosphate is 1:1:1;
(2) Mixing 7kg of plate-shaped corundum, 1.5kg of high alumina bauxite clinker, 0.8kg of fused magnesia and 0.1kg of chrome green for 10min, then adding 0.6kg of premixed powder, continuously stirring and mixing for 15min to obtain 10kg of aluminum-magnesium-chrome material fireclay;
wherein the particle size of the plate-shaped corundum is composed of 400 mu m granules and 200 meshes of fine powder, and the weight ratio of the granules to the fine powder is 1:1.5;
wherein the grain diameter of the high alumina bauxite chamotte is 200 mu m;
wherein the grain size of the fused magnesia is 200 meshes;
wherein the particle size of the chrome green is 200 meshes.
Examples 2 to 5, comparative examples 1 to 6
Examples 2 to 5, comparative examples 1 to 3 are different from example 1 as shown in Table 1.
TABLE 1 parameters (unit: kg) for the differences between examples 2-5, comparative examples 1-3 and example 1
| Group of | Plate-shaped corundum | High alumina bauxite clinker | Electric smelting magnesia | Chrome green |
| Example 1 | 7.0 | 1.5 | 0.8 | 0.1 |
| Example 2 | 6.5 | 2.0 | 0.8 | 0.1 |
| Example 3 | 7.5 | 1.0 | 0.8 | 0.1 |
| Example 4 | 6.2 | 2.0 | 1.0 | 0.2 |
| Example 5 | 5.9 | 2.0 | 1.2 | 0.3 |
| Comparative example 1 | 5.9 | 2.0 | 1.0 | 0.5 |
| Comparative example 2 | 5.7 | 2.0 | 1.5 | 0.2 |
| Comparative example 3 | 5.4 | 2.5 | 1.0 | 0.2 |
Comparative example 4
Comparative example 4 the same preparation as in example 1 was carried out, comparative example 4 comprising 7.0kg of tabular corundum, 1.5kg of bauxite clinker, 0.3kg of chrome green, 0.85kg of ultrafine powder, 0.3kg of sintering agent and 0.05kg of additive, except that fused magnesia was not included in comparative example 4.
Comparative example 5
Comparative example 5 the same preparation as in example 1 was carried out, comparative example 5 comprising 7.0kg of platy corundum, 1.5kg of bauxite clinker, 0.9kg of fused magnesia, 0.45kg of ultrafine powder, 0.1kg of sintering agent and 0.05kg of additive, except that chromium green was not included in comparative example 5.
Comparative example 6
Comparative example 6 is a high aluminum material fireclay comprising 5kg white corundum and 5kg high aluminum bauxite clinker;
wherein the particle size of the white corundum is 200 meshes;
wherein the grain diameter of the high alumina bauxite chamotte is 200 meshes.
Performance test
The above-mentioned fireclay prepared in examples 1 to 5 and comparative examples 1 to 6 was mixed with water in an amount of 0.16 times that of the fireclay, and then subjected to performance test. Preserving heat of the fire clay mixed by adding water for 3 hours at 1500 ℃, and detecting normal-temperature flexural strength, normal-temperature flexural bonding strength and heating permanent line change of the fire clay;
wherein, the normal temperature flexural strength detection refers to GB/T3001-2017 method for testing normal temperature flexural strength of refractory materials;
the normal temperature flexural bond strength detection refers to GBT 22459.4-2008 part 4 of refractory mortar: normal temperature flexural bond strength test method;
wherein, the detection of the change of the heating permanent line is referred to GB/T5988-2007 method for testing the change of the heating permanent line of the refractory material, and the specific detection results are shown in Table 2.
TABLE 2 Performance test results
| Group of | Normal temperature flexural strength/MPa | Normal temperature fracture strength/MPa | Heat permanent line change/% |
| Example 1 | 11 | 4.2 | 0.1 |
| Example 2 | 13 | 4.0 | 0.2 |
| Example 3 | 13 | 3.5 | 0.2 |
| Example 4 | 15 | 5.7 | 0.3 |
| Example 5 | 13 | 3.6 | 0.5 |
| Comparative example 1 | 10 | 2.5 | 0.3 |
| Comparative example 2 | 9 | 2.2 | 0.1 |
| Comparative example 3 | 10 | 4.1 | -0.2 |
| Comparative example 4 | 7 | 1.5 | -3 |
| Comparative example 5 | 10 | 2.3 | -0.25 |
| Comparative example 6 | 6 | 1.1 | -5 |
As can be seen from the combination of examples 1 to 5 and comparative examples 1 to 6 and the combination of Table 2, when the aluminum-magnesium-chromium material fireclay is prepared according to the formulation described in examples 1 to 5, the obtained aluminum-magnesium-chromium material fireclay has high normal temperature flexural strength and normal temperature flexural bond strength, and has a certain micro-expansion, and the obtained aluminum-magnesium-chromium material fireclay has the normal temperature flexural strength of more than 11MPa, the normal temperature flexural bond strength of more than 3MPa and the heating permanent line change of 0.1 to 0.5 percent.
As can be seen by combining example 1 and comparative example 4 and combining Table 2, comparative example 4 does not add fused magnesia during the preparation of the aluminum-magnesium-chromium material fireclay, the fireclay after being mixed with water is kept at 1500 ℃ for 3 hours, the obtained aluminum-magnesium-chromium material fireclay has a normal-temperature flexural strength of 7MPa, a normal-temperature flexural bond strength of 1.5MPa and a heat permanent line change of-3%, which is shown as larger shrinkage.
As can be seen by combining examples 1-5 and comparative example 6 with Table 2, the aluminum magnesium chromium materials of examples 1-5 of the present application have higher properties and have some micro-expansion than the prior art high aluminum materials of comparative example 6. According to detection, the normal-temperature flexural strength of the aluminum-magnesium-chromium material fire clay obtained by the method is higher than that of the aluminum material fire clay by more than 5MPa, and the normal-temperature flexural bonding strength of the aluminum-magnesium-chromium material fire clay obtained by the method is higher than that of the aluminum material fire clay by more than 2.4 MPa.
Service life detection
The fire clay obtained by the method is used in a sliding block tundish, and the sliding block tundish is a T-shaped ladle with the specification: the length is 7900mm, the width is 3000mm, and the height is 1500mm. The continuous casting blank section of 165mm multiplied by 165mm is produced by using the slide block tundish, the pulling speed is 4.0m/min, the service life of the slide block tundish (the cold steel penetrating out of the joint of the split water inlet of the tundish is required to be less than or equal to 50mm or the cold steel penetrating in from the joint of the water inlet and the brick cup is required to be less than or equal to 50 mm) is detected, and the specific detection results are shown in table 3.
TABLE 3 detection results
| Group of | Service life/h |
| Example 1 | 50 |
| Example 2 | 55 |
| Example 3 | 61 |
| Example 4 | 86 |
| Example 5 | 73 |
| Comparative example 1 | 45 |
| Comparative example 2 | 38 |
| Comparative example 3 | 42 |
| Comparative example 4 | 35 |
| Comparative example 5 | 30 |
| Comparative example 6 | 22 |
As can be seen from the combination of examples 1 to 5 and comparative examples 1 to 6 and the combination of table 3, the aluminum magnesium chromium material fireclay obtained in examples 1 to 5 of the present application was used at the water inlet of the tundish, and the service life of the tundish was measured to be 50h or more after use, and was 2.27 times as long as that of example 6 (high aluminum material fireclay), particularly the aluminum magnesium chromium material fireclay obtained in example 4, and was 86h and 3.91 times as long as that of example 6 after application.
It can be seen from the combination of examples 1 to 5 and comparative examples 4 to 5 and the combination of Table 3 that when the fireclay of aluminum-magnesium-chromium material is prepared, the service life of the tundish can reach more than 50 hours under the mutual cooperation of the raw materials of plate-shaped corundum, high alumina bauxite clinker, fused magnesia, chrome green and the like.
It is to be understood that the above embodiments are merely illustrative of the exemplary embodiments employed to illustrate the principles of the present application, however, the present application is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the present application, and are also considered to be within the scope of the invention.
Claims (10)
1. The aluminum-magnesium-chromium material fireclay is characterized by comprising, by weight, 55-75% of plate-shaped corundum, 0-20% of high-aluminum bauxite clinker, 8-12% of fused magnesia, 1-3% of chrome green, 4-10% of ultrafine powder, 1-3% of sintering agent and 0.5-1% of additive.
2. The aluminum-magnesium-chromium material fireclay according to claim 1, wherein said platy corundum is 65-75% and said high alumina bauxite clinker is 10-20%.
3. An aluminium magnesium chromium material fireclay according to claim 2, wherein said platy corundum is 70% and said high alumina bauxite clinker is 15%.
4. The aluminum magnesium chromium material fireclay according to claim 1 wherein said fused magnesia is 10-12% and said chrome green is 2-3%.
5. The aluminum magnesium chromium material fireclay according to claim 4 wherein said fused magnesia is 12 percent and said chrome green is 3 percent.
6. The aluminum magnesium chromium material fireclay according to claim 1 wherein said ultra-fine powder is selected from the group consisting of α -Al 2 O 3 Fine powder and SiO 2 Fine powder.
7. An aluminium magnesium chromium material cement according to any one of claims 1 to 5, wherein said plate-like corundum consists of 200-600 μm granules and 200 mesh fines.
8. The aluminum magnesium chromium material fireclay according to claim 7, wherein the weight ratio of said pellets to said fine powder is 1 (1-1.5).
9. A method for preparing an aluminum-magnesium-chromium material fireclay according to any one of claims 1 to 8, comprising the steps of,
(1) Premixing the superfine powder, the sintering agent and the additive to prepare premixed powder;
(2) And mixing the plate-shaped corundum, the high alumina bauxite clinker, the fused magnesia and the chrome green, then adding the premixed powder, continuously stirring and mixing for more than 15 minutes, and obtaining the aluminum-magnesium-chrome material fireclay.
10. Use of a fireclay of an aluminium-magnesium-chromium material according to any one of claims 1-8, wherein said fireclay of an aluminium-magnesium-chromium material is used in a tundish.
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