WO2022237776A1 - 基于ca6的中等体积密度耐火材料、制法及其应用 - Google Patents
基于ca6的中等体积密度耐火材料、制法及其应用 Download PDFInfo
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- WO2022237776A1 WO2022237776A1 PCT/CN2022/091972 CN2022091972W WO2022237776A1 WO 2022237776 A1 WO2022237776 A1 WO 2022237776A1 CN 2022091972 W CN2022091972 W CN 2022091972W WO 2022237776 A1 WO2022237776 A1 WO 2022237776A1
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- refractory material
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- cao
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- 239000011819 refractory material Substances 0.000 title claims abstract description 496
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 135
- 239000010431 corundum Substances 0.000 claims abstract description 120
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 20
- 239000011029 spinel Substances 0.000 claims abstract description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 274
- 239000000843 powder Substances 0.000 claims description 252
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 232
- 239000000203 mixture Substances 0.000 claims description 225
- 239000011159 matrix material Substances 0.000 claims description 209
- 239000000126 substance Substances 0.000 claims description 150
- 238000000034 method Methods 0.000 claims description 148
- 235000012255 calcium oxide Nutrition 0.000 claims description 138
- 239000000292 calcium oxide Substances 0.000 claims description 138
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 136
- 239000000463 material Substances 0.000 claims description 125
- 239000000395 magnesium oxide Substances 0.000 claims description 116
- 235000012245 magnesium oxide Nutrition 0.000 claims description 116
- 238000005245 sintering Methods 0.000 claims description 105
- 238000007731 hot pressing Methods 0.000 claims description 53
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 52
- 239000008187 granular material Substances 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 37
- 239000010959 steel Substances 0.000 claims description 37
- 238000009413 insulation Methods 0.000 claims description 33
- 150000001875 compounds Chemical class 0.000 claims description 24
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 22
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 15
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 12
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 9
- 239000000920 calcium hydroxide Substances 0.000 claims description 9
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 9
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 8
- 239000001095 magnesium carbonate Substances 0.000 claims description 8
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 8
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 8
- 235000019738 Limestone Nutrition 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 7
- 239000006028 limestone Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052599 brucite Inorganic materials 0.000 claims description 6
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 5
- 239000000347 magnesium hydroxide Substances 0.000 claims description 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 33
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- -1 magnesium aluminate Chemical class 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 385
- 238000004458 analytical method Methods 0.000 description 170
- 230000003628 erosive effect Effects 0.000 description 51
- 239000002994 raw material Substances 0.000 description 36
- 239000007791 liquid phase Substances 0.000 description 32
- 239000002245 particle Substances 0.000 description 32
- 238000005259 measurement Methods 0.000 description 31
- 239000011575 calcium Substances 0.000 description 19
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 17
- 229910052791 calcium Inorganic materials 0.000 description 17
- 229910001570 bauxite Inorganic materials 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 238000000280 densification Methods 0.000 description 13
- 238000002844 melting Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 241000276425 Xiphophorus maculatus Species 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 229910020068 MgAl Inorganic materials 0.000 description 5
- 238000000748 compression moulding Methods 0.000 description 5
- 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 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 229910052863 mullite Inorganic materials 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000002447 crystallographic data Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910019440 Mg(OH) Inorganic materials 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 235000010216 calcium carbonate Nutrition 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
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- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
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- 230000035515 penetration Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 238000004846 x-ray emission Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910026161 MgAl2O4 Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000003313 weakening effect Effects 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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- 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
- C04B35/44—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 aluminates
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- 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
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- 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
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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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
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Definitions
- the invention relates to the technical field of refractory materials, in particular to a CA6-based medium volume density refractory material, a manufacturing method and an application thereof.
- the integrity, safety, leak-proof and certain thermal insulation performance of the ladle lining refractory material are very critical, and the permanent lining refractory material plays a very important role in it.
- the ladle lining is usually designed with a three-layer structure: working lining, permanent lining and thermal insulation lining.
- the working lining is in contact with the high-temperature melt, requiring good high-temperature performance and good resistance to molten steel and slag erosion.
- the permanent lining should have both safety and heat insulation effects. It should not only be able to resist the high temperature and erosion of slag and molten steel in the case of losing the working lining, and meet the first condition of safety, but also prevent or weaken the heat from being transmitted outwards. Reduce the temperature carried on the thermal insulation lining to realize the function of thermal insulation.
- the current permanent lining of the ladle, the existing application materials are generally medium-heavy high-alumina castables, or aluminum-magnesium castables, or ordinary low-cement high-alumina castables, or light-weight mullite Aggregate high alumina castables, etc.
- the slag erosion resistance of lightweight aggregate is poor, so, from the perspective of safety, relatively few ladles use lightweight mullite as permanent lining aggregate.
- the construction of the permanent lining is mostly carried out on site. After the ladle has built the heat insulation lining, the core mold is fixed inside the ladle, and the pouring material is poured and vibrated after adding water and stirring on site. The hydration of the hydrating components builds the whole and builds strength.
- the castable is a collection of aggregates and fine powders, aggregates are granular materials with a particle size greater than 0.088mm, and fine powders are powders with a particle size smaller than 0.088mm.
- the sintering activity of the granular material is very weak and basically does not sinter, while the sintering activity of the fine powder is relatively high, and the integrity of the castable mainly comes from the sintering of the fine powder.
- the fine powder also contains components with hydration bonding such as aluminate cement or MgO, components that enhance fluidity such as silica micropowder and activated alumina micropowder, and additives that promote sintering, Dispersion agent, etc., therefore, compared with the aggregate, the matrix part is the weakest link in the high temperature performance of the castable, but it is difficult to change, which is determined by the preparation concept and performance requirements of the refractory castable.
- components with hydration bonding such as aluminate cement or MgO
- components that enhance fluidity such as silica micropowder and activated alumina micropowder
- additives that promote sintering, Dispersion agent, etc. therefore, compared with the aggregate, the matrix part is the weakest link in the high temperature performance of the castable, but it is difficult to change, which is determined by the preparation concept and performance requirements of the refractory castable.
- the low-cement high-alumina castables currently used in permanent linings are generally prepared from bauxite, pure aluminate cement and silica micropowder, and the bulk density is generally 2.95-3.15g/cm 3 .
- Bauxite is generally secondary or tertiary bauxite, with high impurity components and a high content of liquid phase formed at high temperature.
- the high temperature deformation of the material is relatively large. Therefore, there is a process of densification of the structure of the material during use. , leading to higher thermal conductivity of the material and greater heat dissipation.
- Aluminum-magnesium castables are generally prepared from bauxite, magnesia powder and silicon micropowder, etc., and the bulk density is generally 3.0-3.15g/cm 3 .
- the raw materials used in this material are all natural raw materials, with high impurity components, high liquid phase content formed at high temperature, and high temperature deformation of the material. Therefore, there is also a process of densification of the structure of the material during use, resulting in The thermal conductivity is higher and the heat dissipation is larger.
- the structure of calcium hexaaluminate is more suitable as a raw material for permanent lining materials. Therefore, in addition to the existing applied technical materials, the materials used for the permanent lining also have some open patents, such as materials containing CA6.
- Calcium hexaaluminate (CaO ⁇ 6Al 2 O 3 , CA6 for short) has a chemical composition of CaO and Al 2 O 3 , a melting point of 1875°C, a theoretical density of 3.79g/cm 3 , and good fire resistance.
- the crystal structure of calcium hexaaluminate is a magnetoplumbite structure, which is formed by stacking lamellar structures in the C-axis.
- the thermal conductivity in the C-axis is low, and the gap between the lamellar structures also leads to a small thermal conductivity. , Therefore, the thermal conductivity of calcium hexaaluminate raw material is very small.
- CMA (the unified abbreviation of CaO ⁇ 2MgO ⁇ 8Al 2 O 3 and 2CaO ⁇ 2MgO ⁇ 14Al 2 O 3 ) is based on the structure of CA6 and MgO ⁇ Al 2 O 3 through the stacking of the C axis, and its structure is similar to that of CA6 , also tend to form a layered structure, and the thermal conductivity is also small. In view of the similar structure and performance of CMA and CA6, only CA6 will be substituted in the following description.
- this lamellar structure leads to poor heat transfer performance, and also makes it difficult to sinter the calcium hexaaluminate material.
- the bulk density of the calcium hexaaluminate material prepared in the laboratory is generally 2.20-2.70g/cm 3 , which is difficult to apply in the high-temperature field. It is precisely because of this lamellar structure that the sinterability is poor, which is the main reason why it is difficult to prepare CA6 series raw materials with a bulk density greater than 3.0g/cm 3 .
- the volume expansion effect accompanied by the reaction between components also affects the sintering and densification process of calcium hexaaluminate materials.
- Another example is "a preparation method of dense calcium hexaaluminate refractory clinker” (CN110171980A), “a dense calcium hexaaluminate refractory clinker and its preparation method” (CN105585314A), using TiO 2 and MnO as sintering agents respectively , but this method cannot achieve densification by controlling the stacking of atoms in the mirror layer, but only uses the liquid phase to shorten the distance between the crystal grains, and the liquid phase fills the crystal grains of calcium hexaaluminate to transfer the heat Therefore, although this method can improve the density of calcium hexaaluminate, the structure of calcium hexaaluminate is uncontrollable and the thermal conductivity is relatively high.
- CA6 materials can be roughly classified into three categories: (1) CA6 materials with a bulk density of less than 2.0g/ cm3 , although the thermal conductivity is low and the thermal insulation performance is good, this is necessary for the permanent lining of the ladle.
- CA6 materials are difficult to sinter, and the sintering densification is basically promoted by adding SiO 2 , TiO 2 , etc.; (5) CA6 materials are mostly added by adding more ( ⁇ 20%) Corundum or activated alumina fine powder, and through the sintering of corundum or activated alumina fine powder to achieve the strength of the composite material.
- Castables based on natural bauxite have high impurity content and large high-temperature liquid phase, which makes it difficult to resist the erosion of molten steel and slag. Therefore, it is difficult to ensure the safety of permanent lining materials and technologies when the working lining disappears. ; Although the concept of safety lining is given to permanent lining, it is difficult to meet the requirements.
- the bauxite-based permanent lining castables are all natural raw materials, contain more impurities, and have a high liquid phase at high temperatures.
- this type of castable is based on silica powder to improve fluidity.
- the amount of fine powder added is large, and the amount of liquid phase at high temperature will double. In this way, the castable will undergo a certain degree of shrinkage and densification process when it is used at high temperature.
- the material will be further densified with the application, and the thermal conductivity will be further improved. Increase.
- the current medium-heavy high-alumina castables no matter ordinary high-alumina castables, aluminum-magnesium castables, or low-cement high-alumina castables
- the aggregate and fine powder are basically sintered bauxite, and the medium-heavy molybdenum
- mullite is used as a part of the aggregate in stone castables
- the fine powder is still sintered bauxite, which has high density and high thermal conductivity, and the bulk density of these materials is mostly 2.6g /cm 3 or more, even as high as 3.15g/cm 3 .
- the density of these medium-heavy materials is very high, and the thermal conductivity cannot be greatly reduced.
- the castable based on natural raw material bauxite has high impurity content, large amount of high-temperature liquid phase, and sintering shrinkage during long-term use, which leads to weakening of the supporting force on the periphery of the working lining, and the outward expansion of the working lining, resulting in the appearance of the working lining. Cracks or broken bricks are prone to steel breakout accidents.
- CA6 series materials rely on admixtures to achieve sintering, with a large amount of liquid phase, reduced high-temperature performance, and high thermal conductivity.
- the density of high-purity CA6 products after firing is generally between 2.0 and 2.5g/cm3, and the structure is uneven and the strength is very low. It is impossible to speak.
- the high-temperature liquid phase of the material is large, and the creep of the organizational structure is large, so the material shrinks and the volume becomes smaller, resulting in frequent network cracks and large cracks in the permanent lining material; such cracks are very dangerous and are also of great concern to steel mills.
- the working lining is corroded or the molten steel penetrates between the working linings, it is easy to leak out through the cracks of the permanent lining, resulting in major steel breakout accidents.
- the preparation method of the castable determines that its weakness is difficult to change.
- the strength at room temperature and low temperature comes from the hydration and bonding of cement, and after the crystallization water and bound water disappear at 800-900 °C, it mainly depends on the material
- the strength is maintained by the close packing of itself and the addition of microsilica powder, etc., and the strength is maintained by the addition of microsilica powder and other low-melting point phases when the temperature rises.
- the refractory material is an aggregate of aggregate and fine powder. Since the surface of the aggregate particles is relatively passive in sintering and reaction, it is difficult to sinter, and the strength of the refractory material mainly comes from the sintering of the matrix fine powder. Therefore, the matrix fine powder of the refractory material requires a smaller fineness on the one hand. The specific surface area is large, and at the same time, some foreign components that need to promote sintering are mostly added to the matrix fine powder, which also leads to the inhomogeneity of the composition distribution of the refractory material. The high-temperature performance of the matrix fine powder is originally inferior to that of the aggregate, and the high-temperature performance is further weakened after adding sintering aids.
- sintering aids must exist, especially for castables such as ladle permanent lining, which are directly applied without high temperature sintering, and can only be sintered with the help of high temperature during use. In this way, there must be more Sintering aids, which are determined by the development concept of refractory materials, are difficult to improve. However, if the raw materials with high purity are the main materials, the prepared materials are difficult to sinter and cannot form a unified whole.
- castables also need to add additives such as water reducing agent and micro powder;
- the raw materials are basically natural raw materials, so permanent lining materials such as aluminum-magnesium castables and high-alumina castables , its weakness is difficult to change.
- the impurity content of natural raw materials is high, and there are many liquid phases at high temperatures.
- the refractory materials based on this natural raw material have large deformation under high temperature service, unstable organizational structure, densification and increased thermal conductivity; this is based on natural raw materials.
- the refractory material cannot be changed.
- Castables are different from sintered refractory materials, and must use matrix fine powder to meet the constructability, achieve sintering, and form strength.
- the hydration raw materials with medium temperature strength and so on are all added to the matrix fine powder, which makes the matrix composition of the castable very complex, and the high temperature performance will definitely be greatly reduced, which cannot be changed.
- CA6 castables also need to form strength by themselves at medium and high temperatures , to meet its integrity as a permanent lining, it also requires medium and low temperature sintering, which requires the introduction of components that can sinter the liquid phase at low temperature; 2CA6 castables also need to add micropowder, water reducing agent and micropowder to promote flow; 3Low temperature The sintering is promoted at high temperature, and a large amount of liquid phase is formed at high temperature, which leads to a series of problems such as decreased resistance to slag erosion, densified structure, and increased thermal conductivity at high temperature.
- the preparation method and characteristics of the castable determine that the matrix is the weak point, and this weak point will lead to a decrease in the performance of the entire castable. Therefore, in order to reduce the shortage of CA6 series castables, the only way is to introduce a large amount of activated alumina powder and corundum powder to enhance the high temperature performance of the matrix and strengthen its structural stability. However, this also increases the thermal conductivity, etc. series of questions.
- the matrix has good fluidity, proper hardening, easy sintering, less high-temperature liquid phase, high corrosion resistance, and no performance degradation. These all need to be implemented on the matrix, which has always been a contradiction that is difficult to reconcile. It is still difficult to solve.
- the significance of solving the above problems and defects is: it can realize the purification of the permanent lining material, enhance the resistance of the permanent lining material to the erosion of slag and molten steel, ensure the safety of the smelting ladle, and prevent major accidents such as steel leakage; it can strengthen the structure of the material Stability and high-temperature integrity, endow the permanent lining material with low and relatively stable thermal conductivity, prevent heat transfer to the outside, reduce the heating temperature of molten steel, reduce the tapping temperature and carbon-oxygen product of the converter, reduce the consumption of refractory materials, and reduce the alloy
- the consumption, economic benefit and socio-economic benefit are all very significant.
- the present invention provides a CA6-based medium volume density refractory material, its manufacturing method and its application.
- the invention mixes fine powder or granular material with fine powder, and then adopts a hot pressing sintering method to prepare a CA6-based medium volume density refractory material.
- the obtained refractory material has high purity, good high temperature stability, uniform structure and stable performance.
- a CA6-based medium bulk density thermal insulation refractory material includes CA6 and one or more phases selected from C2M2A14, CM2A8, magnesium aluminum spinel and corundum .
- the C2M2A14 phase is 0-72%, preferably 0-60%;
- CM2A8 phase is 0-72%, preferably 0-59.5%;
- the magnesium aluminum spinel phase is 0-10%, 0-4.60%, preferably 0, and
- the corundum phase is 0-30%, preferably 0-18%, more preferably 0-16.5%.
- the C2M2A14 phase is 0-72%, preferably 0-60%;
- CM2A8 phase is 0-72%, preferably 0-60%, more preferably 0-59.5%;
- the magnesium aluminum spinel phase is 0-10%, 0-8.0%, 0-4.60%, 0-4.0%, preferably 0, and
- the corundum phase is 0-30%, preferably 0-18%, more preferably 0-16.5%, further preferably 0-15%, most preferably 0-12%.
- thermoelectric material according to any one of items 1-3, wherein the chemical composition of the heat-insulating refractory material includes Al 2 O 3 , CaO and MgO, such that the In terms of mass percentage, the Al 2 O 3 is 86.65-94.10%, preferably 87.60-94.10%, 86.65-92.80%, more preferably 88.07-94.10%, 87.50-92.60%;
- the CaO is 5.80-8.40%, preferably 6.10-8.40%, 6.89-8.40%;
- the MgO is 0-6.05%, preferably 0-5.53%, 0-5.43%, 0-5.04%.
- the insulating refractory material according to any one of items 1-4, wherein the bulk density of the insulating refractory material is 2.40-2.90 g/cm 3 , preferably 2.40-2.82 g/cm 3 .
- thermoelectric material according to any one of items 1-5, wherein the phase of the matrix part of the heat-insulating refractory material includes CA6 and a one or more phases of matter.
- the corundum phase is 0-30%, preferably 0-20%, 0-25%;
- the magnesium aluminum spinel phase is 0-10%, 0-8.0%, 0-6.7%, 0-5.22%, preferably 0;
- C2M2A14 phase is 0-30%, preferably 0-25%, 0-20%, 0-18.8%;
- CM2A8 phase is 0-30%, preferably 0-25%, 0-20%, 0-18.8%.
- the CaO is 5.80-8.40%, preferably 6.25-8.40%, 6.60-8.40%;
- the MgO is 0-2.52%, preferably 0-2.10%, 0-1.68%.
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is obtained by hot pressing and sintering.
- the fine powder containing CaO is selected from quicklime, limestone, calcium hydroxide, CaO. Al 2 O 3 , CaO. 2Al 2 O 3 , 12CaO.
- the fine powder containing Al 2 O 3 is selected from active ⁇ -Al 2 O 3 powder, ⁇ -Al 2 O 3 powder, ⁇ -Al 2 O 3 powder, aluminum hydroxide, industrial alumina, white corundum One or more types of corundum powder, sub-white corundum powder, dense corundum powder, sintered corundum powder and tabular corundum powder;
- the MgO-containing fine powder is selected from one or more of magnesite, light-burned magnesia, brucite, magnesium hydroxide, magnesium chloride, high-purity magnesia and fused magnesia.
- thermal insulation refractory material according to item 9 or 10, wherein the granular material is selected from one or more of CA6, C2M2A14 and CM2A8, preferably CA6.
- thermoforming refractory material according to any one of items 9-12, wherein, in the hot-press sintering, the mixture is placed in a mold of a high-temperature device for hot-press sintering or the mixture is subjected to constant temperature After molding, it is put into a mold of a high-temperature device for hot-press sintering, or the mixture is molded at normal temperature and pre-sintered at low temperature, and then hot-press sintered.
- thermoplastic refractory material according to any one of items 9-13, wherein the hot-pressing sintering temperature is 1550-1750° C., preferably, the hot-pressing strength is 0.5-10 MPa.
- a method for preparing a heat-insulating refractory material comprising the steps of:
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is obtained by hot pressing and sintering.
- the fine powder is selected from one or more of CaO-containing fine powder, Al2O3 - containing fine powder and MgO-containing fine powder;
- the fine powder containing CaO is selected from quicklime, limestone, calcium hydroxide, CaO. Al 2 O 3 , CaO. 2Al 2 O 3 , 12CaO.
- the fine powder containing Al 2 O 3 is selected from active ⁇ -Al 2 O 3 powder, ⁇ -Al 2 O 3 powder, ⁇ -Al 2 O 3 powder, aluminum hydroxide, industrial alumina, white corundum One or more of sintered corundum powder, sub-white corundum powder, sintered corundum powder and tabular corundum powder;
- the MgO-containing fine powder is selected from one or more of magnesite, light-burned magnesia, brucite, magnesium hydroxide, magnesium chloride, high-purity magnesia and fused magnesia.
- a permanent lining for iron and steel smelting ladles comprising the heat-insulating refractory material described in any one of items 1-14 or the heat-insulating refractory material prepared by the preparation method described in any one of items 15-20. Material.
- a thermal insulation lining or working lining for an aluminum liquid drum which comprises the thermal insulation refractory material described in any one of items 1-14 or prepared by the preparation method described in any one of items 15-20 insulation refractory materials.
- the invention realizes good sintering of high-purity CA6 system materials, high material strength, good heat insulation performance and strength performance, good resistance to erosion of molten slag and molten steel, and is very suitable for permanent lining of ladles, molten aluminum, etc. Linings and heat insulation linings, refractory linings of some industrial kilns, etc., have good heat insulation, heat preservation, safety, and remarkable economic and social benefits. The specific effects are detailed as follows:
- the material of the present invention has high purity and no pollution to smelting materials
- the material of the present invention Compared with the corresponding ladle permanent lining material and aluminum liquid ladle material, the material of the present invention has higher purity, good high temperature stability, and the total content of Al 2 O 3 +CaO+MgO is ⁇ 96.5%.
- the material of the present invention has high purity, it will not introduce impurities into the solution during the process of smelting steel, aluminum alloy or other alloys, and will not affect the purity and performance of the alloys.
- sintering As a high-purity raw material system, the sintering of materials is relatively difficult. Therefore, in the current refractory materials, sintering is basically promoted by introducing admixtures, compounding reactions or generating low-melting liquid phases. This will also lead to inhomogeneous material structure: some regions are high-purity systems with higher melting points and better crystallization, and some are liquid phase regions with complex components, lower melting points and high-temperature properties. The inhomogeneity of this structure leads to its creep and slip at high temperature, the degradation of material properties, and the increase of thermal conductivity and other properties.
- the material of the present invention is not based on the generation of low-melting liquid phase to promote sintering, there is no low-melting liquid phase, there is no creep and slippage of the microstructure, and the performance is stable. At the same time, there is no performance degradation of materials in different service stages, which is not available in traditional materials.
- the material system is a high-purity system, and the structure of the material is not based on the sintering promoted by the low melting point liquid phase, the material structure is uniform, and there is no weak point to resist the erosion of slag. Therefore, the material of the present invention is resistant to metal melts and melts The overall erosiveness of the slag is very good, which can guarantee the safety characteristics of the permanent lining.
- CA6-based materials Due to the lamellar structure of CA6, the thermal conductivity of CA6-based materials is low. This is important for permanent linings where thermal insulation is required.
- Figure 1 is a schematic diagram of the heat-insulating refractory material obtained in Example 1 of the present invention and the CA6 castable obtained in Comparative Example 1 after being treated at 1500 ° C
- Figure A is the heat-insulating refractory material obtained in Example 1 after 1500 ° C
- Figure B is the schematic diagram of the CA6 castable obtained in Comparative Example 1 after treatment at 1500°C.
- Fig. 2 is a schematic cross-sectional view of the heat-insulating refractory material described in Example 1 of the present invention after being eroded by slag at 1500°C;
- Fig. 3 is a schematic cross-sectional view of the CA6 castable obtained in Comparative Example 1 after being corroded by slag at 1500°C.
- the present invention provides a CA6-based medium bulk density heat-insulating refractory material, the phase of the heat-insulating refractory material includes CA6 and one or more than two kinds selected from C2M2A14, CM2A8, magnesium aluminum spinel and corundum Phase.
- a phase is a phase in a substance that has specific physical and chemical properties.
- C2M2A14 refers to 2CaO ⁇ 2MgO ⁇ 14Al 2 O 3 .
- CM2A8 refers to CaO.2MgO.8Al 2 O 3 .
- the phase of the heat-insulating refractory material is determined by XRD, for example, the measured material is ground to below 325 mesh, and then scanned by an X-ray diffractometer. By analyzing the diffraction data and matching with the standard PDF card, the relevant phase is obtained, and then the content of the relevant phase is obtained by fitting the full spectrum of the diffraction data.
- the total content of CA6, C2M2A14, CM2A8, corundum and magnesium-aluminum spinel is ⁇ 90%, preferably 94.8-99.5%.
- the total content of CA6, C2M2A14, CM2A8, magnesia-aluminum spinel and corundum can be 90%, 91%, 92%, 93%, 94%, 95% in terms of mass percentage in the heat-insulating refractory material , 96%, 96.2%, 96.55%, 96.6%, 96.8%, 97.1%, 97.5%, 97.7%, 97.8%, 97.9%, 98%, 98.05%, 98.95%, 99.15%, 100% or between any range.
- the CA6 phase is 26.7-100%, preferably 29.0-100%, preferably 31.5- 100%, preferably 31.5-99.5%, more preferably 38.7-99.5%;
- the C2M2A14 phase is 0-72%, preferably 0-60%;
- CM2A8 phase is 0-72%, preferably 0-60%, more preferably 0-59.5%;
- the magnesium aluminum spinel phase is 0-10%, 0-8.0%, 0-4.60%, 0-4.0%, preferably 0, and
- the corundum phase is 0-30%, preferably 0-18%, more preferably 0-16.5%, further preferably 0-15%, most preferably 0-12%.
- the CA6 phase can be 26.7%, 28%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97.8%, 99.5%, 100%, or any range therebetween.
- C2M2A14 phase can be 0, 5%, 10%, 15%, 20%, 24.5%, 25%, 30%, 35%, 35.2%, 40%, 45%, 50%, 55%, 60%, 65% %, 70%, 71%, 72% or any range therebetween.
- CM2A8 phase can be 0, 5%, 10%, 15%, 20%, 24%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% %, 71%, 72%, or any range therebetween.
- the corundum phase can be 0, 5%, 10%, 12%, 15%, 18%, 20%, 25%, 30% or any range therebetween.
- the magnesium aluminum spinel can be 0, 1%, 2%, 3%, 4%, 4.60%, 5%, 6%, 7%, 8%, 9%, 10% or any range therebetween.
- the chemical composition of the heat-insulating refractory includes Al 2 O 3 , CaO and MgO, in terms of mass percentage in the heat-insulating refractory,
- the Al 2 O 3 is 86.65-94.10%, preferably 87.60-94.10%, 86.65-92.80%, more preferably 88.07-94.10%, 87.50-92.60%;
- the CaO is 5.80-8.40%, preferably 6.10-8.40%, 6.89-8.40%; and the MgO is 0-6.05%, preferably 0-5.53%, 0-5.43%, 0-5.04%.
- the Al 2 O 3 can be, for example, 86.65%, 87.60%, 88%, 89%, 90%, 91%, 92%, 93%, 94% %, 94.10% or any range therebetween;
- the CaO can be 5.80%, 6.0%, 7.0%, 8.0%, 8.40% or any range therebetween;
- the MgO may be 0, 1.0%, 2.0%, 3.0%, 4.0%, 5.0%, 5.60%, 6.05% or any range therebetween.
- the chemical composition of the heat-insulating refractory material is analyzed by fluorescence, that is, XRF, and determined according to GB/T 21114-2007.
- the bulk density of the heat-insulating refractory material is 2.40-2.90 g/cm 3 , preferably 2.40-2.82 g/cm 3 .
- the bulk density of the heat insulating refractory material can be 2.40g/cm 3 , 2.50g/cm 3 , 2.55g/cm 3 , 2.60g/cm 3 , 2.70g/cm 3 , 2.80g/cm 3 , 2.90g/cm 3 g/cm 3 or any range in between.
- the bulk density of the heat-insulating refractory material is measured according to GB/T2997-2000.
- the phase of the matrix part of the heat-insulating refractory material includes CA6 and one or more of them selected from corundum, magnesium-aluminum spinel, C2M2A14 and CM2A8 phase.
- the matrix portion of the heat-insulating refractory material refers to the portion of the heat-insulating refractory material that does not include particles.
- phase of the matrix part of the heat-insulating refractory material is determined by XRD micro-diffraction.
- the operation method may be, for example, to select 7 different samples and cut 7 samples from them. Each sample was subjected to micro-diffraction, and full-spectrum fitting was performed on the spectrum to determine the content of each phase. Remove the 2 data with large deviation, and then take the average value of the phase content of the remaining 5 samples, which is the phase content of the heat-insulating refractory matrix. In order to ensure accurate analysis and small deviation, the selected matrix area should be maximized during sample preparation and scanning.
- the CA6 phase is 67.4-100%, preferably 72.5-100%, 78.2-100%, 78.8-100%;
- the corundum phase is 0-30%, preferably 0-20%, 0-25%;
- the magnesium aluminum spinel phase is 0-10%, 0-8.0%, 0-6.7%, 0-5.22%, preferably 0;
- C2M2A14 phase is 0-30%, preferably 0-25%, 0-20%, 0-18.8%;
- CM2A8 phase is 0-30%, preferably 0-25%, 0-20%, 0-18.8%.
- the CA6 phase can be 67.4%, 70%, 75%, 80%, 85%, 90%, 95%, 98.5% , 100% or any range in between;
- the corundum phase can be 0, 5%, 10%, 15%, 20%, 25%, 30% or any range between them;
- the magnesium aluminum spinel phase can be 0, 1%, 2%, 3%, 4%, 4.85%, 5.22%, 6%, 7%, 8%, 9%, 10% or any range between them ;
- the C2M2A14 phase can be 0, 5%, 10%, 15%, 20%, 25%, 30% or any range between them;
- the CM2A8 phase can be 0, 5%, 10%, 15%, 20%, 25%, 28.4%, 30% or any range therebetween.
- the chemical composition of the heat-insulating refractory matrix includes Al 2 O 3 , CaO and MgO, in terms of mass percentage in the heat-insulating refractory matrix , the Al 2 O 3 is 89.03-94.10%, preferably 89.03-93.65%, 90.30-93.20%, 89.03-93.28%;
- the CaO is 5.80-8.40%, preferably 6.25-8.40%, 6.60-8.40%;
- the MgO is 0-2.52%, preferably 0-2.10%, 0-1.68%.
- the Al 2 O 3 may be 89.03%, 90.55%, 91.00%, 91.10%, 91.20%, 91.30%, 91.40%, 91.50% based on the mass percentage of the heat-insulating refractory material matrix , 91.60%, 91.70%, 91.80%, 91.90%, 92.00%, 92.10%, 92.20%, 92.30%, 92.40%, 92.50%, 92.60%, 92.70%, 92.80%, 92.90%, 93.00%, 93.10%, 93.20 %, 93.30%, 93.40%, 93.50%, 93.60%, 93.70%, 93.80%, 93.90%, 94.00%, 94.10% or any range therebetween;
- the CaO can be 5.80%, 5.85%, 5.90%, 6.00%, 6.10%, 6.20%, 6.30%, 6.40%, 6.50%, 6.60%, 6.70%, 6.80%, 6.90%, 7.00%, 7.10%, 7.20%, 7.30%, 7.40%, 7.50%, 7.60%, 7.70%, 7.80%, 7.90%, 8.00%, 8.10%, 8.20%, 8.30%, 8.40% or any range therebetween;
- the MgO can be 0, 1.00%, 1.10%, 1.20%, 1.30%, 1.40%, 1.48%, 1.50%, 1.60%, 1.70%, 1.80%, 1.90%, 2.00%, 2.10%, 2.20%, 2.30 %, 2.52%, or any range in between.
- the chemical composition of the heat-insulating refractory matrix is determined by performing elemental analysis on the matrix part of the sample under an electron microscope, that is, EDS analysis.
- the method includes the following steps: selecting 10 different samples, cutting out more than 12 samples from them, and polishing the surface. Put each sectioned sample under the electron microscope, select the matrix part and select a rectangular area of appropriate size for element collection; convert the element content into oxides and then calculate the chemical composition content. Remove the two data with large deviation, and then take the average of the Al 2 O 3 , CaO, and MgO contents of the 10 samples to obtain the chemical composition of the heat-insulating refractory matrix. In order to ensure accurate chemical composition and small deviation, the selected rectangular area should be maximized when collecting elements.
- thermoforming a thermoplastic material is prepared by a method comprising the following steps:
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is obtained by hot pressing and sintering.
- the granular material refers to the part that cannot be sieved through the 180 mesh square hole sieve (Xinxiang Zhongtuo Machinery Equipment Co., Ltd.), that is, the part on the 180 mesh square hole sieve, and the particle size of the granular material is 180 mesh -8mm.
- the fine powder refers to the part passing through the 180-mesh square-hole sieve, that is, the part under the 180-mesh square-hole sieve, and its particle size is ⁇ 180 mesh.
- the hot press sintering refers to a way of realizing material sintering under the joint action of applied pressure and temperature.
- the fine powder is selected from one or more of CaO-containing fine powder, Al2O3 - containing fine powder and MgO-containing fine powder;
- the fine powder containing CaO is selected from quicklime, limestone, calcium hydroxide, CaO. Al 2 O 3 , CaO. 2Al 2 O 3 (CA2), 12CaO.
- the fine powder containing Al 2 O 3 is selected from active ⁇ -Al 2 O 3 powder, ⁇ -Al 2 O 3 powder, ⁇ -Al 2 O 3 powder, aluminum hydroxide, industrial alumina, white corundum One or more types of corundum powder, sub-white corundum powder, dense corundum powder, sintered corundum powder and tabular corundum powder;
- the MgO-containing fine powder is selected from one or more of magnesite, light-burned magnesia, brucite, magnesium hydroxide, magnesium chloride, high-purity magnesia and fused magnesia;
- the fine powder containing CaO refers to the fine powder including CaO component in its chemical composition, or the fine powder including CaO, Al 2 O 3 , or the fine powder including CaO, MgO, Al 2 O 3 .
- the fine powder containing Al 2 O 3 refers to the alumina-based fine powder whose chemical composition is mainly Al 2 O 3 .
- the fine powder containing MgO refers to the fine powder whose chemical composition is mainly MgO or Mg(OH) 2 .
- the quicklime also known as burnt lime
- Active ⁇ -Al 2 O 3 powder is an alumina powder with ⁇ -Al 2 O 3 as the main ingredient and high activity obtained from industrial alumina or aluminum hydroxide as raw material and treated at 1250-1450°C;
- ⁇ -Al 2 O 3 powder is an alumina powder with high specific surface area and good adsorption capacity obtained from aluminum hydroxide as raw material through high temperature treatment.
- ⁇ -Al 2 O 3 powder is an alumina powder with certain hydration binding properties obtained from aluminum hydroxide as raw material through rapid high-temperature treatment at 600-900°C.
- Industrial alumina is an alumina-based raw material prepared by calcining aluminum hydroxide at 900-1250 °C.
- White corundum powder is an alumina raw material with a content of more than 97.5% of aluminum oxide (Al 2 O 3 ) prepared by electric melting of industrial alumina as raw material, and contains a small amount of iron oxide, silicon oxide and other components, and is white.
- Al 2 O 3 aluminum oxide
- Sub-white corundum powder is produced from bauxite. Because its chemical composition and physical properties are close to those of white corundum, it is called sub-white corundum.
- the product has the hardness of white corundum and the toughness of brown corundum. It is an ideal high-grade refractory material and abrasive material.
- Sintered corundum powder refers to the refractory clinker made of alumina as raw material, which is ground into balls or blanks and sintered at a high temperature of 1750-1900 °C. Good thermal shock resistance and slag erosion resistance.
- Tabular alumina powder has a coarse and well-developed ⁇ -Al 2 O 3 crystal structure, with an Al 2 O 3 content of more than 97%, a plate-like crystal structure, small pores and many closed pores.
- Light-burned magnesia is a magnesium oxide-based raw material with high activity and a phase of periclase, which is prepared from magnesite (mainly composed of magnesium carbonate) and calcined at 800-1000°C.
- Brucite is a raw material whose main component is Mg(OH) 2 .
- High-purity magnesia is a sintered magnesia raw material with MgO content ⁇ 96.5%, which is made of light-calcined magnesia as raw material, briquetted and calcined at high temperature.
- Fused magnesia is a dense magnesia raw material with MgO content ⁇ 96.5% prepared from light-burned magnesia or magnesite by arc melting.
- the fine powder when using one or more of quicklime, limestone, calcium hydroxide, CaO ⁇ Al 2 O 3 , CaO ⁇ 2Al 2 O 3 , 12CaO ⁇ 7Al 2 O 3
- the fine powder will be It also includes fine powder containing Al 2 O 3 or fine powder containing Al 2 O 3 and fine powder containing MgO, depending on the phase and chemical composition of the product;
- the The above-mentioned fine powder also includes Al2O3 - containing fine powder or Al2O3 - containing fine powder and CaO-containing fine powder, depending on the phase and chemical composition of the product;
- the fine powders When using fine powders containing Al 2 O 3 , if these fine powders containing Al 2 O 3 are used alone and cannot meet the phase and chemical composition of the product matrix, the fine powders also include fine powders containing CaO or containing MgO fine powder, or CaO-containing fine powder and MgO-containing fine powder, depending on the phase and chemical composition of the product.
- the granular material is selected from one or more of CA6, C2M2A14 and CM2A8, preferably CA6.
- the mass ratio of the granular material/the fine powder is 0-60:40-100.
- the mass ratio of the granular material to the fine powder can be 0, 1/99, 2/98, 3/97, 4/96, 5/95, 6/94, 7/93, 8/92, 9/91, 10/90, 11/89, 12/88, 13/87, 14/86, 15/85, 16/84, 17/83, 18/ 82, 19/81, 20/80, 21/79, 22/78, 23/77, 24/76, 25/75, 26/74, 27/73, 28/72, 29/71, 30/70, 31/69, 32/68, 33/67, 34/66, 35/65, 36/64, 37/63, 38/62, 39/61, 40/60, 41/59, 42/58, 43/ 57, 44/56, 45/55, 46/54, 47/53, 48/52, 49/51, 50/50, 51/49, 52/48, 53/47, 54/46, 55/45, 56/
- the mixture in the hot press sintering, is put into a mold of a high temperature device for hot press sintering or the mixture is molded at normal temperature and then put into a high temperature device Hot-press sintering in a mold or hot-press sintering after the mixture is molded at constant temperature and pre-sintered at low temperature.
- putting the mixed material into a mold of a high-temperature device for hot-press sintering means that the mixed material is put into a mold of a high-temperature device to heat up, and when the temperature reaches the highest temperature, pressure is applied to achieve sintering; Or put the mixture into the mold of the high temperature device and apply pressure when the temperature rises to a certain temperature, then gradually increase the temperature and increase the applied pressure until the temperature reaches the highest temperature and the pressure reaches the maximum value, and the hot pressing sintering of the material is completed; or Put the mixture into the mold of the high-temperature device, and gradually increase the pressure on the mixture while raising the temperature until the temperature reaches the highest temperature and the pressure reaches the maximum value, and the hot-press sintering of the material is completed.
- Molding the mixture at normal temperature and then putting it into a mold of a high-temperature device for hot-press sintering means that the mixture is pressed at normal temperature into a body or prefabricated at room temperature, dried and then hot-pressed and sintered.
- the method of hot pressing sintering is the same as above.
- the mixture After the mixture is molded at normal temperature and pre-sintered at low temperature, then hot-pressed and sintered, it means that the mixture is pressed at low temperature or preformed and pre-sintered at 1350-1500°C, and then put into a mold of a high-temperature device for hot pressing sintering.
- the high-temperature device is a high-temperature device commonly used in the art, for example, a high-temperature device is a hot-press furnace.
- the temperature of hot pressing sintering is 1550-1750°C, preferably, the hot pressing strength is 0.5-10MPa, for example, the temperature can be 1550°C, 1600°C, 1650°C, 1700°C, 1750°C or any range therebetween;
- Hot compression strength can be, for example, 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa, 3.5MPa, 4MPa, 4.5MPa, 5MPa, 5.5MPa, 6MPa, 6.5MPa, 7MPa, 7.5MPa, 8MPa, 8.5MPa, 9MPa , 9.5MPa, 10MPa or any range between them.
- the invention provides a method for preparing a heat-insulating refractory material, which comprises the following steps:
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is obtained by hot pressing and sintering.
- the mass ratio of the granular material to the fine powder is 0-60:40-100.
- the mixture in the hot press sintering, is put into a mold of a high temperature device for hot press sintering or the mixture is molded at normal temperature and then put into a high temperature device Hot pressing sintering in a mold or hot sintering after the mixture is molded at constant temperature and pre-sintered at low temperature.
- the hot pressing strength is 0.5-10 MPa.
- the heat insulation refractory material based on CA6 medium volume density obtained in the present invention realizes good sintering of high-purity CA6 system materials, and the material strength is high; the microstructure of the material is uniform, the heat insulation performance and strength performance are relatively uniform, and the resistance Slag and molten steel have good erosion ability, very suitable for permanent lining of ladle, molten aluminum and other working linings and heat insulation linings, refractory linings of some industrial kilns, etc., good heat insulation, heat preservation, safety, economic and social Significant benefits.
- the invention provides a permanent lining for iron and steel smelting ladles, which includes the above-mentioned heat-insulating refractory material or the heat-insulating refractory material prepared by the above-mentioned preparation method.
- the present invention provides a heat-insulating lining or working lining for an aluminum liquid ladle, which comprises the above-mentioned heat-insulating refractory material or the heat-insulating refractory material prepared by the above-mentioned preparation method.
- the present invention generally and/or specifically describes the materials and test methods used in the test.
- % means wt%, ie weight percentage.
- the raw materials or instruments used without indicating the manufacturer are all commercially available conventional raw material products, wherein Table 1 shows the quality of the raw materials used in the examples.
- the phase analysis of the refractory material adopts XRD analysis, that is, the measured material is ground to below 325 mesh, and then scanned by an X-ray diffractometer (Bruker: D8 ADVANCE).
- XRD analysis that is, the measured material is ground to below 325 mesh, and then scanned by an X-ray diffractometer (Bruker: D8 ADVANCE).
- the relevant phases are obtained, and then the content of the relevant phases is obtained through the full-spectrum fitting of the diffraction data, so that the phases are mainly CA6, so that in the refractory
- the content of the CA6 phase is 99.5%.
- the chemical composition analysis of the refractory material adopts fluorescence or XRF analysis, and is measured according to GB/T21114-2007.
- its chemical composition includes 91.04% Al 2 O 3 , 8.40% CaO .
- the phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, that is, 12 different refractory materials are selected, and 12 samples are cut out of them. In each sample, the matrix area with relatively uniform color and structure was selected for micro-area diffraction, and the diffraction pattern was fitted with a full spectrum to determine the content of each phase. Remove the 2 data with large deviation, and then take the average value of the phase content of the remaining 10 samples, which is the phase content of the refractory matrix, and the phase of the matrix part of the refractory material mainly includes CA6, wherein, based on the mass percentage of the phase in the matrix part of the refractory material, the content of the CA6 phase is 99.2%;
- the chemical composition of the matrix part in the refractory material was measured by EDS method, that is, 12 different refractory materials were selected, and 12 samples were cut out of them and surface polished. Put each sectioned sample under an electron microscope, select a region with a relatively uniform structure in the matrix part, and select a rectangular collection area of appropriate size in this area for element collection; convert the collected element content into oxides Then calculate the chemical composition content.
- the chemical composition of the matrix part of the refractory material includes Al 2 O 3 91.20% and CaO 8.40%.
- the CA6-based medium bulk density refractory material was measured according to GB/T2997-2000, and the measured bulk density was 2.54 g/cm 3 .
- the thermal conductivity of the refractory material obtained in embodiment 1 at 350°C is 0.61w/m.k.
- the prepared material was made into a crucible, steel slag was put into the crucible, the temperature was raised to 1500°C, and the temperature was kept for 3 hours, then the cooled sample was cut along the middle, and the thickness of the sample corroded by steel slag was measured to be 3.12 mm.
- the phase of the described medium bulk density refractory material comprises CA6, corundum, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 86.50%, and the content of the corundum phase is 12%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 92.60% Al 2 O 3 and 6.72% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.8%, and the content of the corundum phase is 20%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 93.28% Al 2 O 3 , 6.60 %CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- the measurement was carried out by the same method as in Example 1, and the erosion thickness of the refractory material was obtained to be 2.87 mm.
- CA6 granular material (maximum particle is 3mm) of 500g, the CA6 fine powder of 400g, the C2M2A14 powder of 100g are mixed to obtain compound;
- the phase of the described medium bulk density refractory material comprises CA6, C2M2A14, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 89.12%, and the content of the C2M2A14 phase is 9.4%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 91.03% Al 2 O 3 , 0.43% MgO, 8.02% CaO.
- the phase of the matrix part of the refractory material includes CA6, C2M2A14, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.2%, and the content of the C2M2A14 phase is 18.8%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 90.8% Al 2 O 3 , 0.8% % MgO, 8.0% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was obtained to be 3.66 mm.
- CA6 granular material (maximum particle is 3mm) of 500g, CA6 fine powder of 400g, industrial alumina powder of 85.8g, high-purity magnesia powder of 8.6g, calcium hydroxide powder of 7.8g are mixed to obtain compound;
- the phase of described medium bulk density refractory material comprises CA6, CM2A8, in the mass percentage accounted for in the phase of described refractory material, the phase of described CA6 phase
- the content is 89.04%
- the content of the CM2A8 phase is 9.4%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 90.34% Al 2 O 3 , 0.78% MgO, 7.86% CaO.
- the phase of the matrix part of the refractory material includes CA6, CM2A8, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.2%, and the content of the CM2A8 phase is 18.8%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 90.30% Al 2 O 3 , 1.68 % MgO, 7.81% CaO.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.53 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 3.70 mm.
- the phase of the described medium bulk density refractory material comprises CA6, C2M2A14, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 71.30%, and the content of the C2M2A14 phase is 23.5%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 88.67% Al 2 O 3 , 1.03% MgO, 7.64% CaO.
- the phase of the matrix part of the refractory material includes CA6, C2M2A14, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 87.2%, and the content of the C2M2A14 phase is 8.3%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 89.03% Al 2 O 3 , 0.35 % MgO, 7.95% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was obtained to be 3.46 mm.
- the phase of the medium bulk density refractory material includes CA6, corundum, and CM2A8.
- CA6 phase The content of the phase is 31.5%
- the content of the corundum phase is 7.78%
- the content of the CM2A8 phase is 58.4%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 87.92% Al 2 O 3 , 4.82% MgO, 6.10% CaO.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.8%, and the content of the corundum phase is 20%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 93.28% Al 2 O 3 , 6.60 %CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was found to be 3.72 mm.
- the phase of the described medium bulk density refractory material comprises CA6, corundum, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 82.0%
- the content of the corundum phase is 16.5%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 91.6% Al 2 O 3 and 6.92% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 82.0%, and the content of the corundum phase is 16.5%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 91.6% Al 2 O 3 , 6.92 %CaO.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.52 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was obtained to be 4.48 mm.
- CA6 fine powder of 800g, platy corundum fine powder of 100g, ⁇ - Al2O3 fine powder of 105g are mixed to obtain compound;
- the phase of the described medium bulk density refractory material comprises CA6, corundum, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 78.6%
- the content of the corundum phase is 20%.
- the chemical composition analysis was carried out by the same method as in Example 1, and the chemical composition of the obtained medium bulk density refractory material included 92.4% Al 2 O 3 and 6.52% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.6%, and the content of the corundum phase is 20%;
- the chemical composition of the matrix of the refractory material includes 92.4% Al 2 O 3 , 6.52 %CaO.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.52 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was obtained to be 4.34 mm.
- the phase of the medium bulk density refractory material includes CA6, C2M2A14, and CM2A8.
- CA6 phase The content of the phase is 29.0%
- the content of the C2M2A14 phase is 60%
- the content of the CM2A8 phase is 8.41%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 87.7% Al 2 O 3 , 3.74% MgO, 6.68% CaO.
- the phase of the matrix part of the refractory material includes CA6, CM2A8, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 72.5%, and the content of the CM2A8 phase is 25.0%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 89.03% Al 2 O 3 , 2.10 % MgO, 7.02% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- CM2A8 aggregate (maximum particle size is 5mm) of 600g, the CA6 fine powder of 200g, the C2M2A14 powder of 100g, the industrial alumina powder of 95g, the CaO powder of 8.7g are mixed evenly to obtain the mixture;
- the phase of the medium bulk density refractory material includes CA6, C2M2A14, and CM2A8.
- CA6 phase The content of the phase is 29%
- the content of the C2M2A14 phase is 9.07%
- the content of the CM2A8 phase is 60%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 86.65% Al 2 O 3 , 5.53% MgO, 6.22% CaO.
- the phase of the matrix part of the refractory material includes CA6, C2M2A14, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 72.5%, and the content of the C2M2A14 phase is 25.0%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 89.06% Al 2 O 3 , 1.20 % MgO, 7.64% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was found to be 4.28mm.
- CM2A8 granular material (maximum particle is 3mm) of 600g, the CA6 fine powder of 200g, the aluminum hydroxide fine powder of 280.2g, the calcium hydroxide fine powder of 22.2g are mixed to obtain compound;
- the phase of described medium bulk density refractory material comprises CA6, CM2A8, in the mass percent that the phase of described refractory material accounts for, the phase of CA6 phase
- the content is 38.7%
- the content of the CM2A8 phase is 59.5%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 88.07% Al 2 O 3 , 5.04% MgO, 6.89% CaO.
- the phase of the matrix portion of the refractory material includes CA6, wherein, in terms of the mass percentage of the phase of the matrix portion of the refractory material, The content of the CA6 phase is 98.7%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 90.5% Al 2 O 3 , 8.40 %CaO.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.65 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was obtained to be 3.67 mm.
- the phase of the described medium bulk density refractory material comprises CA6, C2M2A14, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 38.7%
- the content of the C2M2A14 phase is 60%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 89.32% Al 2 O 3 , 2.74% MgO, 7.41% CaO.
- the phase of the matrix portion of the refractory material includes CA6, wherein, in terms of the mass percentage of the phase of the matrix portion of the refractory material, The content of the CA6 phase is 100%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 90.8% Al 2 O 3 , 8.40 %CaO.
- the bulk density was analyzed in the same way as in Example 1, and the bulk density of the medium bulk density refractory material was 2.82 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 3.08 mm.
- CA6 fine powder of 600g, platy corundum fine powder of 247.8g, ⁇ - Al2O3 fine powder of 155g, CaO fine powder of 8.7g are mixed to obtain compound;
- the phase of the described medium bulk density refractory material comprises CA6, corundum, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 67.4%, and the content of the corundum phase is 30%.
- the chemical composition analysis was carried out by the same method as in Example 1, and the chemical composition of the obtained medium bulk density refractory material included 94.10% Al 2 O 3 and 5.80% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 67.4%, and the content of the corundum phase is 30%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 94.10% Al 2 O 3 , 5.80 %CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was found to be 4.55 mm.
- CM2A8 granular material (maximum particle is 3mm) of 600g, the CA6 fine powder of 320g, the CM2A8 fine powder of 80g are mixed to obtain compound;
- the phase of described medium bulk density refractory material comprises CA6, CM2A8, in the mass percentage accounted for in the phase of described refractory material, the phase of described CA6 phase
- the content is 31.5%
- the content of the CM2A8 phase is 67.1%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 87.60% Al 2 O 3 , 5.62% MgO, 6.43% CaO.
- the phase of the matrix part of the refractory material includes CA6, CM2A8, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.2%, and the content of the CM2A8 phase is 19.2%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 90.30% Al 2 O 3 , 1.68 % MgO, 7.82% CaO.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.63 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was obtained to be 4.06 mm.
- the phase of the described medium bulk density refractory material comprises CA6, C2M2A14, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 67.4%
- the content of the C2M2A14 phase is 30%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 89.32% Al 2 O 3 , 1.38% MgO, 7.81% CaO.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.48 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 5.60 mm.
- CM2A8 granular material (maximum particle is 8mm) of 600g, the CA6 fine powder of 80g, the aluminum hydroxide fine powder of 281g, the lime fine powder of 17.5g, the CM2A8 fine powder of 120g are mixed to obtain compound;
- the mixture After the mixture is press-molded at normal temperature and lightly fired at 1400°C, it is placed in a mold of a high-temperature device for hot-pressing sintering, and the pressure is applied when the temperature rises to 1500°C, and the pressure is gradually increased as the temperature rises , when the temperature rises to 1750°C, the maximum hot-pressing strength is 0.5MPa, and the medium volume density refractory material is obtained.
- the phase of described medium bulk density refractory material comprises CA6, CM2A8, in the mass percentage accounted for in the phase of described refractory material, the phase of described CA6 phase The content is 26.7%, and the content of the CM2A8 phase is 72%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 86.65% Al 2 O 3 , 6.05% MgO, 6.22% CaO.
- the phase of the matrix part of the refractory material includes CA6, CM2A8, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 68%, and the content of the corundum phase is 30%;
- the chemical composition of the matrix of the refractory material includes 89.03% Al 2 O 3 , 2.52 % MgO, 7.60% CaO.
- the bulk density was analyzed in the same way as in Example 1, and the bulk density of the medium bulk density refractory material was 2.90 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was obtained to be 2.94 mm.
- the phase of the refractory material with medium bulk density includes CA6, C2M2A14, MgO Al 2 O 3 , in terms of the mass percentage of the phase of the refractory material , the content of the CA6 phase is 84.2%, the content of the C2M2A14 phase is 9.28%, and the content of the MgO ⁇ Al 2 O 3 phase is 4.60%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 89.14% Al 2 O 3 , 1.71% MgO, 7.65% CaO.
- the phase of the matrix part of the refractory material includes CA6, MgO ⁇ Al 2 O 3 , wherein, the phase of the matrix part of the refractory material In terms of mass percentage, the content of the CA6 phase is 93.5%, and the content of the MgO ⁇ Al 2 O 3 phase is 5.22%;
- the chemical composition of the matrix of the refractory material includes 90.07% Al 2 O 3 , 1.32 % MgO, 7.67% CaO.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.57 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 5.04 mm.
- the phase of the described medium bulk density refractory material comprises CA6, corundum, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 66.4%
- the content of the corundum phase is 30%.
- the chemical composition analysis was carried out by the same method as in Example 1, and the chemical composition of the obtained medium bulk density refractory material included 94.10% Al 2 O 3 and 5.80% CaO in terms of the mass percentage of the refractory material.
- the bulk density was analyzed in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.52 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 4.55 mm.
- the phase of the described medium bulk density refractory material comprises CA6, C2M2A14, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 26.7%
- the content of the C2M2A14 phase is 72%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 88.87% Al 2 O 3 , 3.36% MgO, 7.16% CaO.
- the phase of the matrix part of the refractory material includes CA6, C2M2A14, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 68.1%, and the content of the C2M2A14 phase is 30%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 90.46% Al 2 O 3 , 1.31 % MgO, 7.82% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.60 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 4.9 mm.
- the phase of the described medium bulk density refractory material comprises CA6, corundum, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 85.5%
- the content of the corundum phase is 11.8%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 92.03% Al 2 O 3 and 7.18% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 77.2%, and the content of the corundum phase is 20%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 93.2% Al 2 O 3 , 6.61 %CaO.
- the bulk density was analyzed in the same way as in Example 1, and the bulk density of the medium bulk density refractory material was 2.90 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 2.73 mm.
- the phase of the refractory material with medium bulk density includes CA6, C2M2A14, MgO Al 2 O 3 , in terms of the mass percentage of the phase of the refractory material , the content of the CA6 phase is 70.7%, the content of the C2M2A14 phase is 9.28%, and the content of the MgO ⁇ Al 2 O 3 phase is 10.0%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 88.5% Al 2 O 3 , 3.02% MgO, 7.21% CaO.
- the phase of the matrix part of the refractory material includes CA6, MgO ⁇ Al 2 O 3 , wherein, the phase of the matrix part of the refractory material In terms of mass percentage, the content of the CA6 phase is 78.6%, and the content of the MgO ⁇ Al 2 O 3 phase is 11.2%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 89.3% Al 2 O 3 , 2.95% % MgO, 7.20% CaO.
- the bulk density was analyzed in the same way as in Example 1, and the bulk density of the medium bulk density refractory material was 2.85 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was obtained to be 4.83 mm.
- the phase of the medium bulk density refractory material includes CA6, C2M2A14, and CM2A8.
- CA6 phase The content of the phase is 31.5%
- the content of the C2M2A14 phase is 60%
- the content of the CM2A8 phase is 7.48%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 88.08% Al 2 O 3 , 3.41% MgO, 7.15% CaO.
- the phase of the matrix part of the refractory material includes CA6, CM2A8, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.8%, and the content of the CM2A8 phase is 20%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 89.03% Al 2 O 3 , 1.68 % MgO, 7.74% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was obtained to be 3.82 mm.
- CM2A8 granular material (maximum particle is 3mm) of 600g, the CA6 fine powder of 220g, the C2M2A14 fine powder of 80g, the active alumina micropowder of 94g, the CaO fine powder of 8.75g are mixed to obtain compound;
- the phase of the medium bulk density refractory material includes CA6, C2M2A14, and CM2A8.
- CA6 phase The content of the phase is 31.5%
- the content of the C2M2A14 phase is 8%
- the content of the CM2A8 phase is 60%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 87.50% Al 2 O 3 , 5.43% MgO, 6.08% CaO.
- the phase of the matrix part of the refractory material includes CA6, C2M2A14, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 78.8%, and the content of the C2M2A14 phase is 20%;
- the chemical composition of the matrix of the refractory material includes 90.60% Al 2 O 3 , 0.98 % MgO, 7.76% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was obtained to be 3.84 mm.
- the phase of the medium bulk density refractory material includes CA6, corundum, and MgAl 2 O 4 .
- the content of the CA6 phase is 82.8%
- the content of the corundum phase is 9.72%
- the content of the MgAl 2 O 4 phase is 4.0%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 89.31% Al 2 O 3 , 1.14% MgO, 6.92% CaO.
- the phase of the matrix part of the refractory material includes CA6, corundum, MgAl 2 O 4 , wherein, the phase of the matrix part of the refractory material In terms of mass percentage, the content of the CA6 phase is 73.8%, the content of the corundum phase is 16.3%, and the content of the MgAl2O4 phase is 6.7% ;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 90.28% Al 2 O 3 , 1.91 % MgO, 6.25% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was obtained to be 3.86 mm.
- the phase of the described medium bulk density refractory material comprises CA6, corundum, in the mass percent that the phase of the refractory material accounts for, the CA6 phase of the material
- the content is 82.7%, and the content of the corundum phase is 15%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 92.80% Al 2 O 3 and 6.52% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 72.5%, and the content of the corundum phase is 25%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 93.65% Al 2 O 3 , 6.25 %CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was obtained to be 3.74 mm.
- the phase of the medium bulk density refractory material includes CA6, corundum, and CM2A8.
- CA6 phase The content of the phase is 29.0%
- the content of the corundum phase is 9.15%
- the content of the CM2A8 phase is 57.5%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 88.91% Al 2 O 3 , 4.92% MgO, 5.80% CaO.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 73.1%, and the content of the corundum phase is 25.0%;
- the chemical composition analysis of the matrix part is carried out according to the same method as in Example 1.
- the chemical composition of the matrix part of the refractory material includes 93.65% Al 2 O 3 , 6.25 %CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- Example 2 Measurement was carried out by the same method as in Example 1, and the erosion thickness of the refractory material was obtained to be 3.98 mm.
- phase of described medium bulk density refractory material comprises CA6, in the mass percentage accounted for in the phase of described refractory material, the content of described CA6 phase of matter is 100%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 91.2% Al 2 O 3 and 8.40% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix portion of the refractory material includes CA6, wherein, in terms of the mass percentage of the phase of the matrix portion of the refractory material, The content of the CA6 phase is 100%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 91.1% Al 2 O 3 , 8.40 %CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- the measurement was carried out by the same method as in Example 1, and the erosion thickness of the refractory material was obtained to be 4.66 mm.
- the phase of the medium bulk density refractory material includes CA6, corundum, and MgAl 2 O 4 .
- the content of the CA6 phase is 61.7%
- the content of the corundum phase is 20.3%
- the content of the MgAl 2 O 4 phase is 8%.
- the chemical composition analysis is carried out.
- the chemical composition of the obtained medium bulk density refractory material includes 90.04% Al 2 O 3 , 2.25% MgO, 5.80% CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.55 g/cm 3 .
- the measurement was carried out by the same method as in Example 1, and the erosion thickness of the refractory material was obtained to be 4.72 mm.
- the phase of described medium bulk density refractory material comprises CA6, in the mass percentage accounted for in the phase of described refractory material, the content of described CA6 phase of matter is 99.5%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 91.51% Al 2 O 3 and 8.40% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix portion of the refractory material includes CA6, wherein, in terms of the mass percentage of the phase of the matrix portion of the refractory material, The content of the CA6 phase is 100%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 91.52% Al 2 O 3 , 8.40 %CaO.
- the bulk density analysis was carried out in the same manner as in Example 1, and the bulk density of the medium bulk density refractory material was 2.40 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was found to be 3.95 mm.
- phase of described medium bulk density refractory material comprises CA6, in the mass percentage accounted for in the phase of described refractory material, the content of described CA6 phase of matter is 100%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 91.51% Al 2 O 3 and 8.39% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6 wherein, in terms of the mass percentage of the phase of the matrix part of the refractory material, the The content of the CA6 phase is 100%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 91.54% Al 2 O 3 , 8.39 %CaO.
- the bulk density was analyzed in the same way as in Example 1, and the bulk density of the medium bulk density refractory material was 2.82 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was found to be 2.41 mm.
- the phase of described medium bulk density refractory material comprises CA6, in the mass percent that the phase of described refractory material accounts for, the content of described CA6 phase of matter is 99.5%.
- the chemical composition analysis was carried out by the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material included 91.51% Al 2 O 3 and 8.39% CaO in terms of the mass percentage of the refractory material.
- the phase of the matrix part of the refractory material includes CA6, corundum, wherein, with the mass percentage that the phase of the matrix part of the refractory material accounts for Calculated, the content of the CA6 phase is 99.5%;
- the chemical composition analysis of the matrix part is carried out.
- the chemical composition of the matrix part of the refractory material includes 91.51% Al 2 O 3 , 8.40 %CaO.
- the bulk density was analyzed in the same way as in Example 1, and the bulk density of the medium bulk density refractory material was 2.90 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was found to be 1.85 mm.
- the phase of the refractory material with medium bulk density includes CA6, MgO ⁇ Al 2 O 3 , in terms of the mass percentage of the phase of the refractory material, the The content of the CA6 phase is 86.7%, and the content of the MgO ⁇ Al 2 O 3 phase is 10.0%.
- the chemical composition analysis is carried out according to the same method as in Example 1.
- the chemical composition of the obtained medium bulk density refractory material includes 95.72% Al 2 O 3 , 2.81% MgO, 7.36% CaO.
- the bulk density was analyzed in the same way as in Example 1, and the bulk density of the medium bulk density refractory material was 2.85 g/cm 3 .
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion depth of the refractory material was found to be 4.78 mm.
- Comparative Example 1 uses a conventional preparation method, that is, adopts the method of Example 1 in Chinese patent application CN107500747A to obtain a refractory material.
- the chemical composition of the obtained refractory material includes Al 2 O 3 and CaO, in terms of the mass percentage in the refractory material, Al 2 O 3 is 92.03%, CaO was 7.12%.
- the phase of the refractory material that obtains is mainly CA6, corundum, CA2, CA, by the mass percent that the phase of matter of the refractory material accounts for, CA6 is 68.75%, and corundum is 68.75%. 24.16%, CA2 is 2.32%, and CA is 2.51%.
- Example 2 The same method as in Example 1 was used for analysis, and the thermal conductivity of the obtained refractory material at 350°C was 2.27w/m.k.
- Example 2 The measurement was carried out in the same manner as in Example 1, and the erosion thickness of the refractory material was found to be 11 mm.
- Example 1 0.61 3.12
- Example 2 1.02 2.87
- Example 3 0.95 3.66
- Example 4 0.96 3.70
- Example 5 0.84 3.46
- Example 6 1.32 3.72
- Example 7 0.9 4.48
- Example 8 0.92 4.34
- Example 9 1.42 4.21
- Example 10 1.48 4.28
- Example 11 1.12 3.67
- Example 12 1.55 3.08
- Example 13 1.02 4.55
- Example 14 1.29 4.06
- Example 15 1.00 5.60
- Example 16 1.71 2.94
- Example 17 1.15 5.04
- Example 18 1.02 4.55
- Example 19 1.21 4.90
- Example 20 1.67 2.73
- Example 21 1.96 4.83
- Example 22 1.23 3.82
- Example 23 1.30 3.84
- Example 24 1.34 3.86
- Example 25 1.37 3.74
- Example 26 1.53 3.98
- Example 27 0.56 4.66
- Example 28 0.95 4.72
- Example 29 0.46 3.95
- Example 30 1.75 2.41
- Example 31 1.87 1.85
- Example 32 1.57 4.78 Comparative example 1 2.27 11
- Example 1 The refractory material obtained in Example 1 was compared with the CA6 castable material obtained in Comparative Example 1.
- the treatment method is as follows: the CA6 refractory material obtained in Example 1 and the CA6 obtained in Comparative Example 1 are poured into a high-temperature furnace to raise the temperature to 1550 ° C, and subjected to heat preservation treatment for 3 hours. The appearance after treatment is shown in Figure 1 Show.
- Fig. 2 and Fig. 3 are respectively the schematic diagrams of the resistance to steel slag erosion of the samples of Example 1 and Comparative Example 1 after 1500°C ⁇ 3h, wherein the steps of resisting steel slag erosion after 1500°C ⁇ 3h are as follows: use refractory materials Make a crucible, put steel slag in the crucible, raise the temperature to 1500°C, keep it warm for 3 hours and then cool it down. Cut the cooled sample along the middle to measure the erosion thickness and corrosion of the slag.
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Abstract
Description
在350℃下的导热率(w/m.k) | 侵蚀厚度(mm) | |
实施例1 | 0.61 | 3.12 |
实施例2 | 1.02 | 2.87 |
实施例3 | 0.95 | 3.66 |
实施例4 | 0.96 | 3.70 |
实施例5 | 0.84 | 3.46 |
实施例6 | 1.32 | 3.72 |
实施例7 | 0.9 | 4.48 |
实施例8 | 0.92 | 4.34 |
实施例9 | 1.42 | 4.21 |
实施例10 | 1.48 | 4.28 |
实施例11 | 1.12 | 3.67 |
实施例12 | 1.55 | 3.08 |
实施例13 | 1.02 | 4.55 |
实施例14 | 1.29 | 4.06 |
实施例15 | 1.00 | 5.60 |
实施例16 | 1.71 | 2.94 |
实施例17 | 1.15 | 5.04 |
实施例18 | 1.02 | 4.55 |
实施例19 | 1.21 | 4.90 |
实施例20 | 1.67 | 2.73 |
实施例21 | 1.96 | 4.83 |
实施例22 | 1.23 | 3.82 |
实施例23 | 1.30 | 3.84 |
实施例24 | 1.34 | 3.86 |
实施例25 | 1.37 | 3.74 |
实施例26 | 1.53 | 3.98 |
实施例27 | 0.56 | 4.66 |
实施例28 | 0.95 | 4.72 |
实施例29 | 0.46 | 3.95 |
实施例30 | 1.75 | 2.41 |
实施例31 | 1.87 | 1.85 |
实施例32 | 1.57 | 4.78 |
对比例1 | 2.27 | 11 |
Claims (22)
- 一种基于CA6的中等体积密度的隔热耐火材料,所述隔热耐火材料的物相包括CA6以及选自C2M2A14、CM2A8、镁铝尖晶石和刚玉的一种或两种以上的物相。
- 根据权利要求1所述的隔热耐火材料,其中,以在隔热耐火材料中所占的质量百分比计,CA6、C2M2A14、CM2A8、镁铝尖晶石和刚玉的总含量≥90%,优选为94.8-100%。
- 根据权利要求1或2所述的隔热耐火材料,其中,以在隔热耐火材料的物相所占的质量百分比计,CA6物相为26.7-100%,优选为29.0-100%,优选为31.5-100%,优选为31.5-99.5%,进一步优选为38.7-99.5%;C2M2A14物相为0-72%,优选为0-60%;CM2A8物相为0-72%,优选为0-60%,进一步优选为0-59.5%;镁铝尖晶石物相为0-10%、0-8.0%、0-4.60%、0-4.0%,优选为0,以及刚玉物相为0-30%,优选为0-18%,进一步优选为0-16.5%,进一步优选为0-15%,最优选为0-12%。
- 根据权利要求1-3中任一项所述的隔热耐火材料,其中,所述隔热耐火材料的化学成分包括Al 2O 3、CaO和MgO,以在所述隔热耐火材料中所占的质量百分比计,所述Al 2O 3为86.65-94.10%,优选为87.60-94.10%、86.65-92.80%,进一步优选为88.07-94.10%、87.50-92.60%;所述CaO为5.80-8.40%,优选为6.10-8.40%、6.89—8.40%;以及所述MgO为0-6.05%,优选为0-5.53%、0-5.43%、0-5.04%。
- 根据权利要求1-4中任一项所述的隔热耐火材料,其中,所述隔热耐火材料的体积密度为2.40-2.90g/cm 3,优选为2.40-2.82g/cm 3。
- 根据权利要求1-5中任一项所述的隔热耐火材料,其中,所述隔热耐火材料的基质部分的物相包括CA6以及选自刚玉、镁铝尖晶石、C2M2A14和CM2A8中的一种或两种以上的物相。
- 根据权利要求6所述的隔热耐火材料,其中,以在所述隔热耐火材料基质部分的物相所占的质量百分比计,CA6物相为67.4-100%,优选为72.5-100%、78.2-100%、78.8-100%;刚玉物相为0-30%,优选为0-20%、0-25%;镁铝尖晶石物相为0-10%、0-8.0%、0-6.7%、0-5.22%,优选为0;C2M2A14物相为0-30%,优选为0-25%、0-20%、0-18.8%;以及CM2A8物相为0-30%,优选为0-25%、0-20%、0-18.8%。
- 根据权利要求6或7所述的隔热耐火材料,其中,所述隔热耐火材料基质部分的化学成分包括Al 2O 3、CaO和MgO,以在所述隔热耐火材料基质部分所占的质量百分比计,所述Al 2O 3为89.03-94.10%,优选为89.03-93.65%、90.30-93.20%、89.03-93.28%;所述CaO为5.80-8.40%,优选为6.25-8.40%、6.60-8.40%;以及所述MgO为0-2.52%,优选为0-2.10%、0-1.68%。
- 根据权利要求1-8中任一项所述的隔热耐火材料,其中,所述隔热耐火材料通过包含下述步骤的方法制备得到:将颗粒料和细粉混合得到混合料,将所述混合料进行热压烧结得到。
- 根据权利要求9所述的隔热耐火材料,其中,所述细粉选自含CaO的细粉、含Al 2O 3的细粉和含MgO的细粉中的一种或两种以上;优选的,所述含CaO的细粉选自生石灰、石灰石、氢氧化钙、CaO﹒Al 2O 3、CaO﹒2Al 2O 3、12CaO﹒7Al 2O 3、CA6、C2M2A14和CM2A8中的一种或两种以上;优选的,所述含Al 2O 3的细粉选自活性α-Al 2O 3粉、γ-Al 2O 3粉、ρ-Al 2O 3粉、氢氧化铝、工业氧化铝、白刚玉粉、亚白刚玉粉、致密刚玉粉、烧结刚玉粉和板状刚玉粉中的一种或两种以上;优选的,所述含MgO的细粉选自菱镁矿、轻烧氧化镁、水镁石、氢氧化镁、氯化镁、高纯镁砂和电熔氧化镁中的一种或两种以上。
- 根据权利要求9或10所述的隔热耐火材料,其中,所述颗粒料选自CA6、C2M2A14和CM2A8中的一种或两种以上,优选为CA6。
- 根据权利要求9-11中任一项所述的隔热耐火材料,其中,所述颗粒料与所述细粉的质量之比为0-60:40-100。
- 根据权利要求9-12中任一项所述的隔热耐火材料,其中,所述热压烧结将所述混合料放入高温装置的模具中进行热压烧结或者将所述混合料经常温成型后再放入高温装置的模具中进行热压烧结或者将所述混合料经常温 成型和低温预烧结后进行热压烧结。
- 根据权利要求9-13中任一项所述的隔热耐火材料,其中,热压烧结的温度为1550-1750℃,优选的,热压强度为0.5-10MPa。
- 一种隔热耐火材料的制备方法,其包括下述步骤:将颗粒料和细粉混合得到混合料,将所述混合料进行热压烧结得到。
- 根据权利要求15所述的制备方法,其中,所述细粉选自含CaO的细粉、含Al 2O 3的细粉和含MgO的细粉中的一种或两种以上;优选的,所述含CaO的细粉选自生石灰、石灰石、氢氧化钙、CaO﹒Al 2O 3、CaO﹒2Al 2O 3、12CaO﹒7Al 2O 3、CA6、C2M2A14和CM2A8中的一种或两种以上;优选的,所述含Al 2O 3的细粉选自活性α-Al 2O 3粉、γ-Al 2O 3粉、ρ-Al 2O 3粉、氢氧化铝、工业氧化铝、白刚玉粉、亚白刚玉粉、烧结刚玉粉和板状刚玉粉中的一种或两种以上;优选的,所述含MgO的细粉选自菱镁矿、轻烧氧化镁、水镁石、氢氧化镁、氯化镁、高纯镁砂和电熔氧化镁中的一种或两种以上。
- 根据权利要求15或16所述的制备方法,其中,所述颗粒料选自CA6、C2M2A14和CM2A8中的一种或两种以上,优选为CA6。
- 根据权利要求15-17中任一项所述的制备方法,其中,所述颗粒料/所述细粉的质量比为0-60:40-100。
- 根据权利要求15-18中任一项所述的制备方法,其中,所述热压烧结将所述混合料放入高温装置的模具中进行热压烧结或者将所述混合料经常温成型后再放入高温装置的模具中进行热压烧结或者将所述混合料经常温成型和低温预烧结后进行热烧结。
- 根据权利要求15-19中任一项所述的制备方法,其中,热压烧结的温度为1550-1750℃,优选的,热压强度为0.5-10MPa。
- 一种用于钢铁冶炼钢包的永久衬,其包括权利要求1-14中任一项所述的隔热耐火材料或者权利要求15-20中任一项所述的制备方法制备得到的隔热耐火材料。
- 一种用于铝液包的隔热衬或工作衬,其包括权利要求1-4中任一项所述的隔热耐火材料或者权利要求15-20中任一项所述的制备方法制备得到 的隔热耐火材料。
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CN116120042A (zh) * | 2023-01-19 | 2023-05-16 | 河北国亮新材料股份有限公司 | 一种耐火材料基质紧密堆积的方法及耐火材料 |
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