CN115180929A - Anti-oxidation Al 2 O 3 -SiC-C refractory castable and preparation method thereof - Google Patents
Anti-oxidation Al 2 O 3 -SiC-C refractory castable and preparation method thereof Download PDFInfo
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 title claims abstract description 35
- 230000003064 anti-oxidating effect Effects 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 57
- 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 42
- 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 claims abstract description 32
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 32
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000003647 oxidation Effects 0.000 claims abstract description 27
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 27
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 24
- 239000010431 corundum Substances 0.000 claims abstract description 24
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000010426 asphalt Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 17
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 18
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 16
- 239000004327 boric acid Substances 0.000 claims description 16
- 239000000395 magnesium oxide Substances 0.000 claims description 16
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 229910001570 bauxite Inorganic materials 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 11
- 239000011148 porous material Substances 0.000 abstract description 6
- 239000011819 refractory material Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 3
- 238000010079 rubber tapping Methods 0.000 description 9
- 239000002893 slag Substances 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000011056 performance test Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000013558 reference substance Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
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Abstract
The invention discloses anti-oxidation Al 2 O 3 A refractory-SiC-C castable and a preparation method thereof, belonging to the technical field of refractory materials. The refractory castable comprises the following components in parts by weight: 55-59 parts of alumina aggregate, 20-23 parts of silicon carbide, 15-18 parts of mullite, 5-8 parts of corundum fine powder, 4-6 parts of alumina micro powder, 5-20 parts of a burning promoter, 0.5-2.5 parts of spherical asphalt and 0.5-1.5 parts of metal silicon powder. The proper amount of the burning promoter is added into the casting material, and the proper liquid phase generated in the reaction and conversion process of the burning promoter and the matrix enters pores in the casting material under the action of capillary force to fill up pore channels and prevent oxygen in the air from entering the interior of the material, so that the oxidation of SiC and C in the material is reduced, and the oxidation resistance of the casting material is improved.
Description
Technical Field
The invention belongs to the technical field of refractory materials,in particular to an anti-oxidation Al 2 O 3 -SiC-C refractory castable and a preparation method thereof.
Background
With the continuous development of smelting technology, the large-scale, high-efficiency and long-life blast furnace is a necessary trend and requirement of blast furnace iron-making technology. The blast furnace tapping channel castable is a foundation for ensuring safe, stable and efficient operation of blast furnace tapping, prolongs the service life of the blast furnace tapping channel castable and can effectively reduce the cost of per ton iron, so the blast furnace tapping channel castable is one of the most important foundations and key refractory materials in an iron-making process. As a typical carbonaceous refractory, the main component of a blast furnace tapping runner castable includes corundum (Al) 2 O 3 ) Silicon carbide (SiC) and carbon (C), and the carbon material has excellent thermal shock stability and slag resistance, so the carbonaceous raw material in the tapping channel castable is a basic material and a core of the blast furnace tapping channel castable which can be used under extremely severe working conditions for a long time.
However, the carbon material is very easily oxidized at high temperature, and the oxidized pores create a channel for the erosion of slag/iron to the refractory material, finally resulting in Al 2 O 3 The high-temperature strength, especially the erosion and corrosion resistance, of the-SiC-C refractory castable is exponentially reduced. If the carbon material content is reduced, the thermal shock stability and slag erosion resistance of the material are impaired. Thus, al 2 O 3 The problems of poor oxidation resistance and the like of the-SiC-C refractory castable become technical bottlenecks which restrict the development of carbon-containing refractory materials.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an anti-oxidation Al 2 O 3 -SiC-C refractory castable. The invention also aims to provide anti-oxidation Al 2 O 3 A preparation method of-SiC-C refractory castable.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
anti-oxidation Al 2 O 3 the-SiC-C refractory castable comprises the following components in parts by weight: 55-59 parts of alumina aggregate and carbon20-23 parts of silicon oxide, 15-18 parts of mullite, 5-8 parts of corundum fine powder, 4-6 parts of alumina micro powder, 5-20 parts of a burning promoter, 0.5-2.5 parts of spherical asphalt and 0.5-1.5 parts of metal silicon powder.
The oxidation-resistant Al 2 O 3 the-SiC-C refractory castable comprises the following components in parts by weight: 56-57 parts of alumina aggregate, 20-22 parts of silicon carbide, 17-18 parts of mullite, 6-8 parts of corundum fine powder, 4-5 parts of alumina micro powder, 5-15 parts of a burning promoter, 1-2 parts of spherical asphalt and 0.5-1 part of metal silicon powder.
The oxidation-resistant Al 2 O 3 The burning promoter consists of 5 to 7 parts of magnesium oxide powder, 2 to 4 parts of boric acid and 1.5 to 3.5 parts of tar, wherein the particle size of the magnesium oxide powder is 0.5 to 1mm, and the mass fraction of the boric acid is 30 to 45 percent.
The oxidation-resistant Al 2 O 3 The burning accelerator consists of 6 parts of magnesium oxide powder, 3 parts of boric acid and 2 parts of tar, wherein the particle size of the magnesium oxide powder is 0.5-1mm, and the mass fraction of the boric acid is 35%.
The oxidation-resistant Al 2 O 3 -SiC-C refractory castable and Al in alumina aggregate 2 O 3 ≥ 88wt.%; the bauxite aggregate composition is as follows: 30-35 wt.% of alumina aggregate with the grain diameter of 5-8 mm, 27-33 wt.% of alumina aggregate with the grain diameter of 3-5 mm, and 35-40 wt.% of alumina aggregate with the grain diameter of 1-3 mm.
The oxidation-resistant Al 2 O 3 The SiC-C refractory castable has SiC content of more than or equal to 99 wt% in silicon carbide; the grain diameter of the silicon carbide powder is less than or equal to 0.025mm.
The oxidation-proof Al 2 O 3 -SiC-C refractory castable, al in mullite 2 O 3 60wt.% to 65wt.%, siO 2 22-25 wt.%, tiO 2 3.5wt.% to 4.0wt.%; the mullite grain size gradation is as follows: the grain diameter is 3-5 mm and accounts for 55-60 wt% of the natural fused mullite, and the grain diameter is more than 5mm and less than or equal to 8mm and accounts for 40-45 wt% of the natural fused mullite;
the oxidation-resistant Al 2 O 3 -SiC-C refractory castable, al in corundum fine powder 2 O 3 ≥99wt.％，SiO 2 0.8wt.% or less; the grain diameter of the corundum fine powder is less than or equal to 0.035mm.
The above-mentioned oxidation-preventing Al 2 O 3 The preparation method of the-SiC-C refractory castable comprises the steps of putting raw materials including alumina aggregate, silicon carbide, mullite, corundum fine powder, alumina micro powder, spherical asphalt, a burning promoter, metal silicon powder and aggregate into stirring equipment, stirring at the rotating speed of 200-300 r/min, and uniformly mixing to obtain the anti-oxidation Al 2 O 3 -SiC-C refractory castable.
Has the advantages that: compared with the prior art, the invention has the advantages that:
according to the invention, a proper amount of burning accelerator is added into the castable, and a proper liquid phase generated in the reaction and conversion process of the burning accelerator and the matrix enters pores in the castable under the action of capillary force to plug pore channels and prevent oxygen in air from entering the interior of the castable, so that the oxidation of SiC and C in the castable is reduced, and the oxidation resistance of the castable is improved.
The microstructure of the material is adjusted by adjusting the type, the grain diameter and the adding amount of the burning accelerant, and the oxygen is prevented from entering through the change of microscopic pores, so that the oxidation resistance of the material is improved.
The invention can obviously improve Al 2 O 3 The normal temperature/high temperature mechanical strength, oxidation resistance, slag corrosion resistance and slag corrosion resistance of the-SiC-C product further prolong the high temperature service life of the product, solve the technical bottleneck of the carbon-containing castable, and provide high-performance Al with excellent high temperature erosion wear resistance, slag corrosion resistance and thermal shock stability for the subsequent development of the iron tapping channel of the ultra-large blast furnace 2 O 3 the-SiC-C castable makes technical innovation.
Drawings
FIG. 1 is a graph showing the effect of different amounts of burn promoters on the oxidation resistance of a sample.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying specific embodiments of the present invention are described in detail below.
Al in the alumina aggregate used in the present invention 2 O 3 ≥ 88wt.%; the bauxite aggregate composition is as follows: the bauxite aggregate with the particle size of 5-8 mm accounts for 30-35 wt.%, the bauxite aggregate with the particle size of 3-5 mm accounts for 27-33 wt.%, and the bauxite aggregate with the particle size of 1-3 mm accounts for 35-40 wt.%.
The SiC content in the silicon carbide is more than or equal to 99wt.%; the grain diameter of the silicon carbide powder is less than or equal to 0.025mm.
Al in mullite 2 O 3 60wt.% to 65wt.%, siO 2 22-25 wt.%, tiO 2 3.5wt.% to 4.0wt.%; the mullite grain size gradation is as follows: the grain diameter of the mullite powder is 3-5 mm and accounts for 55-60 wt% of the natural fused mullite, and the grain diameter of the mullite powder is more than 5mm and less than or equal to 8mm and accounts for 40-45 wt% of the natural fused mullite.
Al in corundum fine powder 2 O 3 ≥99wt.％，SiO 2 0.8wt.% or less; the grain diameter of the corundum fine powder is less than or equal to 0.035mm.
Example 1
Anti-oxidation Al 2 O 3 the-SiC-C refractory castable comprises the following components in parts by weight: 56 parts of alumina aggregate, 21 parts of silicon carbide, 18 parts of mullite, 7 parts of corundum fine powder, 4 parts of alumina micro powder, 15 parts of burning promoter, 1 part of spherical asphalt and 0.5 part of metal silicon powder; wherein the burning promoter consists of 6 parts of magnesium oxide powder, 3 parts of boric acid and 2 parts of tar, the particle size of the magnesium oxide powder is 0.5-1mm, and the mass fraction of the boric acid is 35%.
The above-mentioned oxidation-resistant Al 2 O 3 The preparation method of the-SiC-C refractory castable comprises the steps of putting the raw materials of alumina aggregate, silicon carbide, mullite, corundum fine powder, alumina micro powder, spherical asphalt, a burning promoter, metal silicon powder and aggregate into stirring equipment according to the dosage in the formula, stirring at the rotating speed of 250 revolutions per minute, and uniformly mixing to obtain the anti-oxidation Al 2 O 3 -SiC-C refractory castable.
Example 2
Anti-oxidation Al 2 O 3 the-SiC-C refractory castable comprises the following components in parts by weight: 56 parts of alumina aggregate, 21 parts of silicon carbide, 18 parts of mullite, 7 parts of corundum fine powder, 4 parts of alumina micro powder, 5 parts of sintering promoter, 1 part of spherical asphalt and 0.5 part of metal silicon powder;the burning accelerator consists of 6 parts of magnesium oxide powder, 3 parts of boric acid and 2 parts of tar, wherein the particle size of the magnesium oxide powder is 0.5-1mm, and the mass fraction of the boric acid is 35%.
The above-mentioned oxidation-resistant Al 2 O 3 The preparation method of the-SiC-C refractory castable comprises the steps of putting the raw materials of alumina aggregate, silicon carbide, mullite, corundum fine powder, alumina micro powder, spherical asphalt, a burning promoter, metal silicon powder and aggregate into stirring equipment according to the dosage in the formula, stirring at the rotating speed of 250 revolutions per minute, and uniformly mixing to obtain the anti-oxidation Al 2 O 3 -SiC-C refractory castable.
Comparative example 1
Anti-oxidation Al 2 O 3 the-SiC-C refractory castable comprises the following components in parts by weight: 56 parts of alumina aggregate, 21 parts of silicon carbide, 18 parts of mullite, 7 parts of corundum fine powder, 4 parts of alumina micro powder, 1 part of spherical asphalt and 0.5 part of metal silicon powder.
The above-mentioned oxidation-resistant Al 2 O 3 The preparation method of the-SiC-C refractory castable comprises the steps of putting the raw materials of alumina aggregate, silicon carbide, mullite, corundum fine powder, alumina micro powder, spherical asphalt, a burning promoter, metal silicon powder and aggregate into stirring equipment according to the dosage in the formula, stirring at the rotating speed of 250 revolutions per minute, and uniformly mixing to obtain Al 2 O 3 -SiC-C refractory castable.
Oxidation-resistant Al obtained in examples 1 and 2 2 O 3 Al prepared in comparative example 1 with-SiC-C refractory castable as a test piece 2 O 3 the-SiC-C refractory castable is used as a reference substance, and the two samples are subjected to an oxidation resistance test, and the results are shown in figure 1. The middle dark black color in the figure is an unoxidized part, and as can be seen from figure 1, the anti-oxidation Al prepared by the method is 2 O 3 the-SiC-C refractory castable has good oxidation resistance; and different usage amounts of the burning accelerator will affect the oxidation resistance.
Example 3
Anti-oxidation Al 2 O 3 the-SiC-C refractory castable comprises the following components in parts by weight: 58 parts of alumina aggregate, 20 parts of silicon carbide, 15 parts of mullite, 8 parts of corundum fine powder and oxide6 parts of aluminum micro powder, 8 parts of a burning accelerator, 1.5 parts of spherical asphalt and 0.5 part of metal silicon powder; wherein the burning promoter consists of 6 parts of magnesium oxide powder, 3 parts of boric acid and 2 parts of tar, the particle size of the magnesium oxide powder is 0.5-1mm, and the mass fraction of the boric acid is 35%.
The above-mentioned oxidation-resistant Al 2 O 3 The preparation method of the-SiC-C refractory castable comprises the steps of putting the raw materials of alumina aggregate, silicon carbide, mullite, corundum fine powder, alumina micro powder, spherical asphalt, a burning promoter, metal silicon powder and aggregate into stirring equipment according to the dosage in the formula, stirring at the rotating speed of 200 revolutions per minute, and uniformly mixing to obtain the anti-oxidation Al 2 O 3 -SiC-C refractory castable.
Example 4
Anti-oxidation Al 2 O 3 the-SiC-C refractory castable comprises the following components in parts by weight: 57 parts of alumina aggregate, 21 parts of silicon carbide, 17 parts of mullite, 6 parts of corundum fine powder, 4 parts of alumina micro powder, 10 parts of sintering promoter, 1 part of spherical asphalt and 0.5 part of metal silicon powder; wherein the burning promoter consists of 6 parts of magnesium oxide powder, 3 parts of boric acid and 2 parts of tar, the particle size of the magnesium oxide powder is 0.5-1mm, and the mass fraction of the boric acid is 35%.
The above-mentioned oxidation-preventing Al 2 O 3 The preparation method of the-SiC-C refractory castable comprises the steps of putting the raw materials of alumina aggregate, silicon carbide, mullite, corundum fine powder, alumina micro powder, spherical asphalt, a burning promoter, metal silicon powder and aggregate into stirring equipment according to the dosage in the formula, stirring at the rotating speed of 300 revolutions per minute, and uniformly mixing to obtain the anti-oxidation Al 2 O 3 -SiC-C refractory castable.
The refractory castable materials prepared in examples 1 to 4 and comparative example 1 were subjected to performance tests, and the results are shown in table 1. As can be seen from Table 1, the oxidation-resistant Al of the present application 2 O 3 the-SiC-C refractory castable has excellent normal temperature/high temperature mechanical strength, oxidation resistance, slag corrosion resistance and slag corrosion resistance, further prolongs the high temperature service life of the product, solves the technical bottleneck faced by the carbon-containing castable, and is high-performance Al with excellent high temperature erosion wear resistance, slag corrosion resistance and thermal shock stability for the subsequent development of the ultra-large blast furnace tapping channel 2 O 3 the-SiC-C castable makes technical innovation.
Table 1 results of performance tests of refractory castable materials of examples 1-4
Claims (9)
1. Anti-oxidation Al 2 O 3 the-SiC-C refractory castable is characterized by comprising the following components in parts by weight: 55-59 parts of alumina aggregate, 20-23 parts of silicon carbide, 15-18 parts of mullite, 5-8 parts of corundum fine powder, 4-6 parts of alumina micro powder, 5-20 parts of a burning promoter, 0.5-2.5 parts of spherical asphalt and 0.5-1.5 parts of metal silicon powder.
2. The oxidation-resistant Al of claim 1 2 O 3 the-SiC-C refractory castable is characterized by comprising the following components in parts by weight: 56-57 parts of alumina aggregate, 20-22 parts of silicon carbide, 17-18 parts of mullite, 6-8 parts of corundum fine powder, 4-5 parts of alumina micro powder, 5-15 parts of a burning promoter, 1-2 parts of spherical asphalt and 0.5-1 part of metal silicon powder.
3. The oxidation-preventing Al as set forth in claim 1 or 2 2 O 3 the-SiC-C refractory castable is characterized in that the burning promoter consists of 5-7 parts of magnesium oxide powder, 2-4 parts of boric acid and 1.5-3.5 parts of tar, wherein the particle size of the magnesium oxide powder is 0.5-1mm, and the mass fraction of the boric acid is 30% -45%.
4. The oxidation-resistant Al according to claim 1 or 2 2 O 3 the-SiC-C refractory castable is characterized in that the burning promoter consists of 6 parts of magnesia powder, 3 parts of boric acid and 2 parts of tar, the particle size of the magnesia powder is 0.5-1mm, and the mass fraction of the boric acid is 35%.
5. The oxidation-preventing Al as set forth in claim 1 or 2 2 O 3 the-SiC-C refractory castable is characterized in that Al in alumina aggregate 2 O 3 ≥ 88wt.%; the bauxite aggregate composition is as follows: 30-35 wt.% of alumina aggregate with the grain diameter of 5-8 mm, 27-33 wt.% of alumina aggregate with the grain diameter of 3-5 mm, and 35-40 wt.% of alumina aggregate with the grain diameter of 1-3 mm.
6. The oxidation-preventing Al as set forth in claim 1 or 2 2 O 3 the-SiC-C refractory castable is characterized in that the SiC content in the silicon carbide is more than or equal to 99wt.%; the grain diameter of the silicon carbide powder is less than or equal to 0.025mm.
7. The oxidation-preventing Al as set forth in claim 1 or 2 2 O 3 the-SiC-C refractory castable is characterized in that Al in mullite 2 O 3 60wt.% to 65wt.%, siO 2 22-25 wt.%, tiO 2 3.5wt.% to 4.0wt.%; the mullite grain size gradation is as follows: the natural electrofused mullite has the grain size of 3-5 mm accounting for 55-60 wt% of the natural electrofused mullite and the grain size of more than 5-8 mm accounting for 40-45 wt% of the natural electrofused mullite.
8. The oxidation-preventing Al as set forth in claim 1 or 2 2 O 3 the-SiC-C refractory castable is characterized in that Al in corundum fine powder 2 O 3 ≥99wt.％，SiO 2 0.8wt.% or less; the grain diameter of the corundum fine powder is less than or equal to 0.035mm.
9. The oxidation-resistant Al as claimed in claim 1 or 2 2 O 3 The preparation method of the-SiC-C refractory castable is characterized by putting raw materials including alumina aggregate, silicon carbide, mullite, corundum fine powder, alumina micropowder, spherical asphalt, a burning promoter, metal silicon powder and aggregate into stirring equipment, stirring at the rotating speed of 200-300 revolutions per minute, and uniformly mixing to obtain the anti-oxidation Al 2 O 3 -SiC-C refractory castable.
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Application publication date: 20221014 |