CN116969748A - Corundum mullite brick produced by utilizing recycled 95 alumina ceramic and preparation method thereof - Google Patents
Corundum mullite brick produced by utilizing recycled 95 alumina ceramic and preparation method thereof Download PDFInfo
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- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 66
- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 59
- 239000010431 corundum Substances 0.000 title claims abstract description 59
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000011449 brick Substances 0.000 title claims abstract description 57
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 title claims description 54
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000011812 mixed powder Substances 0.000 claims abstract description 17
- 229910052849 andalusite Inorganic materials 0.000 claims abstract description 16
- 230000035939 shock Effects 0.000 claims abstract description 14
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 16
- 239000004927 clay Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims description 4
- 229920001353 Dextrin Polymers 0.000 claims description 3
- 239000004375 Dextrin Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 235000019425 dextrin Nutrition 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 7
- 239000011819 refractory material Substances 0.000 abstract description 5
- 239000002440 industrial waste Substances 0.000 abstract description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 10
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002694 phosphate binding agent Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011214 refractory ceramic Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/16—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 silicates other than clay
- C04B35/18—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 silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
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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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a corundum-mullite brick produced by utilizing recycled 95 alumina ceramic and a preparation method thereof, wherein the corundum-mullite brick comprises the following components in percentage by weight: 40-70% of recovered 95 alumina ceramic, 20-60% of mixed powder and 1-8% of binding agent, wherein the mixed powder comprises, by weight, 10-20% of sintered corundum, 5-20% of andalusite powder, 5-10% of argil powder and 1-10% of calcined alumina micropowder. The recycled 95 alumina ceramic used in the invention is industrial waste, and is used as the main raw material of the invention, so that the linear expansion rate and apparent porosity of the refractory product are reduced, the thermal shock resistance and the wear resistance coefficient are improved, the raw material cost of the refractory material is reduced, the comprehensive utilization of waste is realized, the resource utilization efficiency is improved, and the environment-friendly idea is realized.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a corundum-mullite brick produced by utilizing recycled 95 alumina ceramic and a preparation method thereof.
Background
Corundum mullite brick refers to a refractory product composed of corundum and mullite main crystal phases. The corundum-mullite brick has high use temperature, good corrosion resistance and good thermal shock resistance, but the corundum-mullite brick has high thermal expansion rate, is easy to peel off at the two longitudinal sides Cheng Tu of the top in the use process, and has higher raw material cost.
After various kiln chromium equipment is disassembled, a large amount of waste corundum materials and waste alumina materials can be obtained, and the recovered waste materials can cause a large amount of environmental pollution, so that the method is an effective utilization mode for green and environment-friendly production if the waste materials are effectively recovered and utilized.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the corundum mullite brick produced by using the recycled 95 alumina ceramic and the preparation method thereof are provided by the invention, the 95 alumina ceramic has the advantages of high volume density, low apparent porosity, good thermal shock stability, high compressive strength and small linear expansion rate, and can replace fused corundum so as to overcome the defects of high linear expansion rate and low cost in the prior art, and the corundum mullite brick with excellent comprehensive performance is produced.
The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a corundum mullite brick produced by using recycled 95 alumina ceramic, which comprises the following components in percentage by weight: 40-70% of recovered 95 alumina ceramic, 20-60% of mixed powder and 1-8% of binding agent, wherein the mixed powder comprises, by weight, 10-20% of sintered corundum, 5-20% of andalusite powder, 5-10% of clay powder and 1-10% of calcined alumina micropowder.
The invention takes the recovered 95 alumina ceramic as the main component raw material of the corundum mullite brick, takes the recovered 95 alumina ceramic as the particle phase to replace the original expensive corundum material, takes the mixed powder formed by corundum, andalusite powder, argil powder and calcined alumina micropowder as the matrix, effectively reduces the raw material cost on the premise of maintaining the effective product performance, increases the production benefit and has wide application prospect.
In one embodiment of the invention, the components of the recovered 95 alumina ceramic include Al in parts by weight 2 O 3 ≥94％、R 2 O≤0.2％。
In one embodiment of the invention, the recovered 95 alumina ceramic has a particle size of 3mm or less and a bulk density of 3.6g/cm or more 3 The apparent porosity is less than or equal to 3.5 percent, and the water absorption is less than or equal to 1 percent.
The high-performance ceramic manufactured by the 95 alumina micropowder through spray granulation, isostatic compaction and high-temperature sintering processes is called as a nine-penta alumina ceramic piece, and has the characteristics of high hardness, good wear resistance and good corrosion resistance. The recycled 95 alumina ceramic has the advantages of economy, and can replace fused corundum and reduce cost due to high volume density, low apparent porosity, good thermal shock stability, high compressive strength and small linear expansion rate.
In one embodiment of the invention, the corundum-mullite brick further comprises 5-20% of electric melting mullite according to weight percentage.
In one embodiment of the invention, the composition of the electrofused mullite comprises Al in parts by weight 2 O 3 ≥68％、Fe 2 O 3 ≤0.5％。
In one embodiment of the invention, the grain size of the fused mullite is less than or equal to 1mm.
Mullite is 3Al 2 O 3 ·2SiO 2 The method for synthesizing mullite is divided into a sintering method and an electric melting method, wherein the electric melting method is to add the batch into an electric arc furnace, melt the batch at high temperature formed by electric arc, and cool and crystallize to form the electric melting mullite. Compared with sintered mullite, the electric fused mullite has perfect crystal development, large crystal grains, few defects and hundreds of times of crystal size of the sintered mullite, so that the high-temperature mechanical property and erosion resistance are relatively good.
In one embodiment of the inventionThe components of the sintered corundum comprise Al in parts by weight 2 O 3 ≥99％、Fe 2 O 3 ≤0.2％。
In one embodiment of the invention, the grain size of the sintered corundum is less than or equal to 0.074mm.
The structure of the sintered corundum is a compact alpha-Al 2 O 3 Is milky white and contains a very small amount of beta-Al 2 O 3 And does not contain a glass phase.
In one embodiment of the invention, the andalusite powder comprises the following components in parts by weight 2 O 3 ≥56％、Fe 2 O 3 ≤1.5％。
In one embodiment of the invention, the andalusite powder has a particle size of 1mm or less.
The andalusite powder is grey brown, has glass luster, is opaque, has the hardness of 6.5-7.5 and the specific gravity of 3.15-3.16.
In one embodiment of the invention, the clay powder comprises the following components in parts by weight 2 O 3 ≥15％、Fe 2 O 3 ≤1.8％。
In one embodiment of the invention, the clay powder has a particle size of 0.088mm or less.
The clay powder is also called kaolinite, off-white powder, soft and white in texture and has a density of 2.54-2.60 mg/cm 3 The melting point is about 1785 ℃, the light resistance is good, and the modified aluminum alloy can be used as a binding agent for refractory materials.
In one embodiment of the invention, the calcined alumina micropowder comprises the following components in parts by weight 2 O 3 ≥99.2％。
In one embodiment of the present invention, the calcined alumina fine powder has a particle diameter of 0.005mm or less.
The high-temperature calcined alumina micropowder adopts a rotary kiln, the roasting temperature is about 1300-1400 ℃, and the high-temperature calcined alumina micropowder has the characteristics of high temperature resistance and wear resistance, so that the calcined alumina is generally used in the refractory material and ceramic industry. The high temperature calcined alumina and Bai Yugang are relatively less difficult to process and less costly to process than the calcined alumina and Bai Yugang.
In one embodiment of the invention, the binding agent is an organic or inorganic binding agent, including one or more of industrial phosphoric acid or aluminum dihydrogen phosphate and yellow dextrin.
In one embodiment of the invention, the corundum mullite brick prepared by the invention comprises Al in parts by weight 2 O 3 83％-88％、SiO 2 10％-13％、Fe 2 O 3 0.6％-0.8％、P 2 O 5 1％-6％。
In one embodiment of the invention, the corundum mullite brick prepared by the invention has a bulk density of 3.00 + -0.20 g/cm 3 。
In one embodiment of the invention, the compressive strength of the corundum-mullite brick prepared by the method is 120-180Mpa.
In one embodiment of the invention, the corundum mullite brick prepared by the invention has a soft temperature under load of 1620-1670 ℃ under 0.2 Mpa.
In one embodiment of the invention, the corundum mullite brick prepared by the invention has a apparent porosity of 14-16%.
In one embodiment of the invention, the corundum mullite brick prepared by the invention has a linear expansion coefficient of 0.93-0.95% at 1400 ℃.
In one embodiment of the invention, the corundum mullite brick prepared by the method has thermal shock resistance of more than or equal to 25 times.
In one embodiment of the invention, the corundum mullite brick prepared by the invention has a wear resistance coefficient of 6-8CC.
The invention also aims to provide a preparation method of corundum mullite brick produced by using recycled 95 alumina ceramic, which comprises the following steps:
1) Adding the raw materials into a strong rolling type mixing roll machine, and mixing and grinding for 10-15 minutes to obtain a mixture;
2) Aging the mixture for 12-24 hours, and grinding for 5 minutes again;
3) Pressing and molding the mixture after grinding again to prepare a green brick, drying at 80-180 ℃ for at least 24 hours, and calcining at 1480-1550 ℃ to prepare the corundum-mullite brick.
In one embodiment of the invention, in step 3), the mixture after back grinding is pressed into green bricks by a hanging and exhausting method.
The beneficial effects are that: compared with the prior art, the corundum mullite brick produced by utilizing the recovered 95 alumina ceramic and the preparation method thereof have the following advantages: the recycled 95 alumina ceramic used in the invention is industrial waste, and is used as the main raw material of the invention, so that the linear expansion rate and apparent porosity of the refractory product are reduced, the thermal shock resistance and the wear resistance coefficient are improved, the raw material cost of the refractory material is reduced, the comprehensive utilization of waste is realized, the resource utilization efficiency is improved, and the environment-friendly idea is realized.
Detailed Description
The invention will be further illustrated with reference to examples. The invention will be better understood from the following examples. However, it will be readily understood by those skilled in the art that the specific material ratios, process conditions and results thereof described in the examples are illustrative of the present invention and should not be construed as limiting the invention described in detail in the claims.
In the invention, the related raw materials are all conventional industrial raw materials sold in the market; the processing and manufacturing methods are conventional methods unless otherwise specified.
In the present invention, the reference to Al 2 O 3 Content of SiO 2 Content of Fe 2 O 3 Content, P 2 O 5 The content, volume density, compressive strength, 0.2Mpa load soft temperature, apparent porosity, 1400 ℃ linear expansion rate, thermal shock resistance stability, wear resistance coefficient and other testing methods are all measured by adopting a conventional method.
Example 1:
the corundum-mullite brick produced by using the recycled 95 alumina ceramic piece is designed to comprise the following raw materials in parts by weight: 60 parts of recovered 95 alumina ceramic parts, 40 parts of mixed powder (the mixed powder consists of 19 parts of sintered corundum, 10 parts of andalusite powder, 6 parts of clay powder, 5 parts of calcined alumina micro powder) and 5 parts of industrial phosphate binder.
Recovering 95 alumina ceramic: the components in parts by weight comprise Al 2 O 3 ：94.5％、R 2 O is 0.14 percent, and the grain diameter is less than or equal to 3mm; bulk Density of 3.60g/cm 3 The apparent porosity is less than or equal to 3.2%, the water absorption is 0.9%, and the porous ceramic material is industrial waste.
Sintering corundum: the components in parts by weight comprise Al 2 O 3 99.4％、Fe 2 O 3 0.16 percent, the grain diameter is less than or equal to 0.074mm;
andalusite powder: the components in parts by weight comprise Al 2 O 3 57.1％、Fe 2 O 3 1.49 percent, the grain diameter is less than or equal to 1mm;
clay powder: the components in parts by weight comprise Al 2 O 3 18.3％、Fe 2 O is 1.56%, and the grain diameter is less than or equal to 0.088mm;
calcining aluminum oxide micropowder: the components in parts by weight comprise Al 2 O 3 99.3 percent, the grain diameter is less than or equal to 0.005mm;
industrial phosphoric acid: concentration 60%, density 1.42g/cm 3 。
The preparation method of the corundum-mullite brick produced by using the recycled 95 alumina ceramic piece comprises the following steps:
1) The raw materials are used for recycling 60 parts of aluminum oxide ceramic parts, 40 parts of mixed powder (the mixed powder consists of 19 parts of sintered corundum, 10 parts of andalusite powder, 6 parts of clay powder, 5 parts of calcined aluminum oxide micro powder) and 5 parts of industrial phosphate binder according to the weight ratio.
Adding the mixture into a strong rolling type mixing roller, and mixing and grinding for 15 minutes to obtain a mixture;
2) Aging the mixture obtained in the step 1) for 20 hours, and grinding the aged mixture for 5 minutes again;
3) The mixture after grinding is pressed and formed into green bricks by a hanging and exhausting method, and is dried (dried for not less than 24 hours) at the temperature of 80-180 ℃ and calcined at the temperature of 1500 ℃ to prepare corundum mullite bricks.
Corundum mullite brick Al prepared in this example 2 O 3 The content is 84.65 percent, siO 2 The content is 12.04 percent, fe 2 O 3 The content is 0.79%, P 2 O 5 The content is 2.89%, and the volume density is 3.01g/cm 3 The compressive strength is 131mpa, the loading soft temperature is 1622 ℃ at 0.2mpa, the apparent porosity is 15.2%, the linear expansion rate is 0.946% at 1400 ℃, the thermal shock resistance is more than or equal to 25 times, and the wear resistance coefficient is 7.2CC.
Example 2:
the difference from example 1 is that:
the corundum mullite brick produced by using the recovered 95 alumina ceramic piece comprises the following raw materials in parts by weight:
50 parts of recovered 95 alumina ceramic parts, 10 parts of fused mullite, 40 parts of mixed powder (the mixed powder consists of 19 parts of sintered corundum, 10 parts of andalusite powder, 6 parts of clay powder, 5 parts of calcined alumina micropowder) and 6 parts of industrial phosphate binder.
Electric melting mullite: al (Al) 2 O 3 ≥68％，Fe 2 O 3 Less than or equal to 0.5 percent and the grain diameter less than or equal to 1mm;
industrial phosphoric acid with a concentration of 85% and a density of 1.689g/cm 3 。
Corundum mullite brick Al prepared by the invention 2 O 3 The content is 85.01 percent, siO 2 The content is 11.76 percent, fe 2 O 3 The content is 0.68%, P 2 O 5 The content is 4.9 percent, and the volume density is 3.09g/cm 3 The compressive strength is 1499Mpa, the loading soft temperature is 1647 ℃ at 0.2Mpa, the apparent porosity is 14.1%, the linear expansion rate is 0.938% at 1400 ℃, the thermal shock resistance is more than or equal to 25 times, and the wear resistance coefficient is 6.9CC.
Example 3:
the difference from example 1 is that:
the corundum mullite brick produced by using the recovered 95 alumina ceramic piece comprises the following raw materials in parts by weight:
60 parts of recovered 95 alumina ceramic parts, 40 parts of mixed powder (the mixed powder consists of 19 parts of sintered corundum, 10 parts of andalusite powder, 6 parts of clay powder, 5 parts of calcined alumina micro powder) and 4 parts of aluminum dihydrogen phosphate binder.
The density of the aluminum dihydrogen phosphate is 1.56g/cm 3 。
The steel prepared by the inventionJade mullite brick Al 2 O 3 The content is 84.88 percent, siO 2 The content of Fe is 12.13 2 O 3 The content is 0.69%, P 2 O 5 The content is 1.35%, and the volume density is 3.16g/cm 3 The compressive strength is 165Mpa, the soft temperature under load of 0.2Mpa is 1666 ℃, the apparent porosity is 14.5%, the linear expansion rate at 1400 ℃ is 0.94%, the thermal shock resistance is more than or equal to 25 times, and the wear resistance coefficient is 6.3CC.
Example 4:
the difference from example 1 is that:
the corundum mullite brick produced by using the recovered 95 alumina ceramic piece comprises the following raw materials in parts by weight:
65 parts of recovered 95 alumina ceramic pieces, 35 parts of mixed powder (the mixed powder consists of 12 parts of sintered corundum, 10 parts of andalusite powder, 10 parts of clay powder, 8 parts of calcined alumina micro powder) and 1 part of yellow dextrin bonding agent.
Corundum mullite brick Al prepared by the invention 2 O 3 The content of SiO is 82.14 percent 2 The content of Fe is 13.0 2 O 3 The content is 0.66%, P 2 O 5 The content is 0, and the volume density is 2.98g/cm 3 The compressive strength is 95mpa, the soft temperature under load of 0.2mpa is 1681 ℃, the apparent porosity is 17.5%, the linear expansion rate at 1400 ℃ is 0.941%, the thermal shock resistance is 18 times, and the wear resistance coefficient is 9.1CC.
The results of the performance test of the light insulating castable materials prepared according to the above examples 1 to 4 and the method of the present invention are shown in table 1 below.
Table 1 performance test of light insulating castable prepared in examples 1 to 4
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Al 2 O 3 Content/% | 84.65 | 85.01 | 84.88 | 82.14 |
| SiO 2 Content/% | 12.04 | 11.76 | 12.13 | 13.0 |
| Fe 2 O 3 Content/% | 0.79 | 0.68 | 0.69 | 0.66 |
| P 2 O 5 Content/% | 2.89 | 4.9 | 1.35 | 0 (free) |
| Bulk density/kg/cm 3 | 3.01 | 3.09 | 3.16 | 2.98 |
| Compressive Strength/MPa | 131 | 149 | 165 | 95 |
| Soft temperature under load of 0.2 MPa/. Degree.C | 1622 | 1647 | 1666 | 1681 |
| Apparent porosity/% | 15.2 | 14.1 | 14.5 | 17.5 |
| 1400 ℃ linear expansion/% | 0.946 | 0.938 | 0.94 | 0.941 |
| Thermal shock resistance stability/secondary | ≥25 | ≥25 | ≥25 | 18 |
| Wear coefficient/CC | 7.2 | 6.9 | 6.3 | 9.1 |
As can be seen from the results in Table 1, the corundum mullite bricks prepared in examples 1 to 4 using the recovered 95 alumina ceramic as the main raw material have good compressive strength, small linear expansion coefficient, excellent thermal shock resistance and low wear resistance coefficient, and other properties are equivalent to those of the corundum mullite brick products on the market. And the recycled 95 alumina ceramic has lower price and is easier to obtain, thereby greatly reducing the production cost of the corundum mullite brick.
The invention fully utilizes the unique physical characteristics of stable and compact chemical components of the 95 alumina ceramic, adopts multi-granularity collocation combination, and the main indexes of the prepared corundum mullite brick are superior to the existing indexes, particularly the thermal expansion rate is smaller than that of the existing products, so that the waste 95 alumina ceramic is reused, and the raw material cost of the refractory brick is reduced.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The corundum-mullite brick produced by using the recycled 95 alumina ceramic is characterized by comprising the following components in percentage by weight: 40-70% of recovered 95 alumina ceramic, 20-60% of mixed powder and 1-8% of binding agent, wherein the mixed powder comprises, by weight, 10-20% of sintered corundum, 5-20% of andalusite powder, 5-10% of clay powder and 1-10% of calcined alumina micropowder.
2. Corundum mullite brick according to claim 1 characterized in that the components of the recycled 95 alumina ceramic comprise Al in parts by weight 2 O 3 ≥94％、R 2 O is less than or equal to 0.2 percent, the grain diameter of the recovered 95 alumina ceramic is less than or equal to 3mm, and the volume density is more than or equal to 3.6g/cm 3 The apparent porosity is less than or equal to 3.5 percent, and the water absorption is less than or equal to 1 percent.
3. Corundum mullite brick according to claim 1 characterized in that the corundum mullite brick further comprises 5-20% by weight of electrically fused mullite, the electrically fused mullite comprising Al by weight 2 O 3 ≥68％、Fe 2 O 3 The grain diameter is less than or equal to 0.5 percent and less than or equal to 1mm.
4. Corundum mullite brick according to claim 1 characterized in that the sintered corundum component comprises Al in parts by weight 2 O 3 ≥99.0％、Fe 2 O 3 Less than or equal to 0.2 percent, and the grain diameter of the sintered corundum is less than or equal to 0.074mm.
5. Corundum mullite brick according to claim 1 characterized in that the andalusite powder comprises Al in parts by weight 2 O 3 ≥56％、Fe 2 O 3 The grain diameter of the andalusite powder is less than or equal to 1.5 percent, and the grain diameter of the andalusite powder is less than or equal to 1mm.
6. Corundum mullite brick according to claim 1 characterized in that the clay powder comprises Al in parts by weight 2 O 3 ≥15％、Fe 2 O 3 The grain diameter of the clay powder is less than or equal to 1.8 percent, and the grain diameter of the clay powder is less than or equal to 0.088mm.
7. Corundum mullite brick according to claim 1 characterized in that the calcined alumina micropowder comprises Al in parts by weight 2 O 3 99.2% or more, and the particle size of the calcined alumina micropowder is less than or equal to 0.005mm.
8. Corundum mullite brick according to claim 1 characterized in that the binding agent is an organic or inorganic binding agent comprising one or several of technical phosphoric acid or aluminium dihydrogen phosphate and yellow dextrin.
9. Corundum mullite brick according to claim 1 characterized in that it comprises Al in parts by weight 2 O 3 83％-88％、SiO 2 10％-13％、Fe 2 O 3 0.6％-0.8％、P 2 O 5 1 to 6 percent of corundum mullite brick, wherein the volume density of the corundum mullite brick is 3.00+/-0.20 g/cm 3 The compressive strength is 120-180mpa, the soft temperature under load of 0.2mpa is 1620-1670 ℃, the apparent porosity is 14-16%, the linear expansion rate at 1400 ℃ is 0.93-0.95%, the thermal shock resistance is more than or equal to 25 times, and the wear resistance coefficient is 6-8CC.
10. The method for preparing corundum mullite brick produced by using recycled 95 alumina ceramic according to any one of claims 1-9, characterized by comprising the steps of:
1) Adding the raw materials into a strong rolling type mixing roll machine, and mixing and grinding for 10-15 minutes to obtain a mixture;
2) Aging the mixture for 12-24 hours, and grinding for 5 minutes again;
3) Pressing and molding the mixture after grinding again to prepare a green brick, drying at 80-180 ℃ for at least 24 hours, and calcining at 1480-1550 ℃ to prepare the corundum-mullite brick.
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