CN102633512B - Abandoned molding sand based mullite light heat insulating bricks and preparation method thereof - Google Patents
Abandoned molding sand based mullite light heat insulating bricks and preparation method thereof Download PDFInfo
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- CN102633512B CN102633512B CN 201210105340 CN201210105340A CN102633512B CN 102633512 B CN102633512 B CN 102633512B CN 201210105340 CN201210105340 CN 201210105340 CN 201210105340 A CN201210105340 A CN 201210105340A CN 102633512 B CN102633512 B CN 102633512B
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- 239000003110 molding sand Substances 0.000 title claims abstract description 79
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 48
- 239000011449 brick Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 35
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000010443 kyanite Substances 0.000 claims abstract description 14
- 229910052850 kyanite Inorganic materials 0.000 claims abstract description 14
- 230000032683 aging Effects 0.000 claims abstract description 13
- 238000010792 warming Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 31
- 239000000203 mixture Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 18
- 239000004927 clay Substances 0.000 claims description 14
- 229910001570 bauxite Inorganic materials 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 12
- 235000011194 food seasoning agent Nutrition 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 12
- 229920001353 Dextrin Polymers 0.000 claims description 9
- 239000004375 Dextrin Substances 0.000 claims description 9
- 235000019425 dextrin Nutrition 0.000 claims description 9
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 7
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 7
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 7
- 101710194948 Protein phosphatase PhpP Proteins 0.000 claims description 6
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 6
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 5
- 239000008103 glucose Substances 0.000 claims description 5
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 239000004902 Softening Agent Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 19
- 238000005516 engineering process Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000035939 shock Effects 0.000 abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 239000007767 bonding agent Substances 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000011031 large-scale manufacturing process Methods 0.000 abstract 1
- 239000004014 plasticizer Substances 0.000 abstract 1
- 229910052594 sapphire Inorganic materials 0.000 abstract 1
- 238000003303 reheating Methods 0.000 description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 19
- 238000000034 method Methods 0.000 description 15
- 229910052570 clay Inorganic materials 0.000 description 13
- 239000002699 waste material Substances 0.000 description 13
- 238000005495 investment casting Methods 0.000 description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000012778 molding material 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
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052851 sillimanite Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to abandoned molding sand based mullite light heat insulating bricks and a preparation method thereof, wherein the preparation method in the technical scheme comprises the following steps: firstly mixing 45-80wt% of abandoned molded sand and 20-55wt% of special-grade alumina or alpha-Al2O3 as raw materials; then additionally adding 2-10wt% of kyanite, 5-15wt% of plasticine, 5-30wt% of pore-forming agent, 0.5-4wt% of plasticizer, 0.1-0.5wt% of bonding agent and 15-35wt% of water of the raw materials, mixing uniformly, aging for 3-10 hours, molding, drying naturally, baking at 110 DEG C for 8-12 hours, warming to 1200-1450 DEG C, and keeping the temperature for 2.5-10 hours. The abandoned molding sand based mullite light heat insulating bricks and the preparation method thereof provided by the invention have the advantages of low production cost, simple technology, energy conservation and environment friendliness and easiness for large scale production, and the prepared mullite light heat insulating bricks not only have high pressure-resistant intensity, good heat shock stability, low volume density and small heat conduction coefficient, and also have wide social and economic value.
Description
Technical field
The invention belongs to mullite light thermal-shield refractory material technology field, particularly a kind of mullite light heat-insulation brick based on discarded molding sand and preparation method thereof.
Background technology
Molding sand is to be used for the material of moulding in casting, is generally mixed according to a certain percentage by molding materials such as Foundry sand, moulding sand binder and additional things.In world wide, reach more than 70% with the foundry goods of molding sand Foundry Production.In general, 1 ton of castings of every production will produce 1～1.3 ton of antiquated sand, and the annual antiquated sand amount that produces of China reaches more than 3,000 ten thousand tons, and is few for the treatment process of precision casting waste sand at present, and general treatment process is to stack or landfill.Not only serious environment pollution, be also the waste to resource.How these cast waste sands are turned waste into wealth and become a significant problem that needs to be resolved hurrily.
Light mullite brick be a kind of alumina content be 50～80wt%, with mullite (3Al
2O
32SiO
2) be principal crystalline phase with in conjunction with mutually novel high-quality insulative refractory materials.Because it has the characteristics such as higher thermal structure intensity, higher load softening point, lower high temperature creep and resistance to chemical corrosion be good, can be used as the kiln inwall of direct contact flame.Simultaneously, because its lower thermal conductivity can improve the heat-insulating property of kiln, thereby improved the utilising efficiency of the energy.At present, the main raw material of production mullite light material is bauxitic clay, kyanite and sillimanite etc.But along with the continuous exploitation of limited Mineral resources, when the prices of raw and semifnished materials rise steadily, its grade is also reducing gradually.
The main component of precision casting waste sand is aluminum oxide and silicon-dioxide, the zirconium white (4.0～7.0wt%) that wherein also has suitable content, the raw material of precision casting waste sand as preparation mullite light heat-insulation brick used, not only effectively processed the solid waste of contaminate environment, realized the recycling of waste resource, and prepared mullite light heat-insulation brick makes the good thermal shock stability of goods due to zirconic existence.
" manufacture method of waste-sand road surface bricks " be patented technology (CN101396841), disclose and a kind ofly prepared the method for pavior brick as main raw material take cast waste sand, waste slag, and design a cover and can produce the pavior brick technical process that meets GB, but this technology is had relatively high expectations to the size of antiquated sand, be unfavorable for early stage to the processing of antiquated sand, thereby can not effectively utilize antiquated sand; Simultaneously, the cement amount that this technical requirements adds is larger, can not effectively reduce production costs." method of recovery chromite from cast waste sand " be patented technology (CN1605407), discloses a kind of technology that reclaims chromite from discarded foundry sand, but complex process, and can not utilize discarded molding sand fully.Above two patents are all the resource recyclings for quartzy cast waste sand and water glass cast waste sand.
At present, existing technology for repeating to recycle as the discarded molding sand of main precision casting take flint clay, mullite, zircon sand, as " precision casting waste sand reusing method " (CN101870562A) patented technology, a kind of patented technology take the discarded molding sand of precision casting as raw material manufacturing refractory material casting material is disclosed, this scheme has solved the problem of utilizing of discarded accurate molding sand to a great extent, and it is prepared mould material as main raw material.But because the bleeding of molding sand is very poor, can cause the associativity between mould material aggregate and powder bad, the problems such as outlet segregation sedimentation greatly reduce blank strength, and then cause its actual use properties can not be guaranteed.
Summary of the invention
The present invention is intended to overcome the prior art defective, purpose is to provide that a kind of technique is simple, cost is low, reduce and pollute and the preparation method based on the mullite light heat-insulation brick of discarded molding sand of save energy, has higher compressive strength, better thermal shock resistance, lower volume density and less thermal conductivity with the mullite light heat-insulation brick of the method preparation.
For achieving the above object, the technical solution used in the present invention is: first with the discarded molding sand of 45～80wt% and high grade bauxite or the α-Al of 20～55wt%
2O
3For raw material mixes, add again the kyanite of described raw material 2～10wt%, the soft clay of 5～15wt%, the pore-forming material of 5～30wt%, the softening agent of 0.5～4wt%, the wedding agent of 0.1～0.5wt% and the water of 15～35wt%, mix, ageing mixture 3～10 hours, moulding, seasoning was through 110 ℃ of bakings 8～12 hours, be warming up to 1200～1450 ℃, be incubated 2.5～10 hours.
The main chemical compositions of described discarded molding sand is: SiO
2Content is 50～54wt%, Al
2O
3Content is 35～42wt%, ZrO
2Content is 4.0～7.0wt%; Discarded molding sand is fine powder or for fine powder and particle, the particle diameter of discarded molding sand fine powder is less than 0.074 μ m, and the particle diameter of discarded molding sand particle is 0.10～0.30mm.
Describedly be shaped to extrusion moulding or vibrate extrusion forming for the semidrying mechanical pressing or for semidrying.
Described high grade bauxite and α-Al
2O
3Particle diameter all less than 0.088 μ m.
Described pore-forming material is sawmilling or is powdered rice hulls.
Described wedding agent is one or both of tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and Xylo-Mucine.
Described softening agent is dextrin or is glucose.
Owing to adopting technique scheme, main raw material of the present invention is the annual discarded molding sand that reaches more than 3,000 ten thousand tons, can effectively recycle discarding molding sand, avoid because its direct stacking or landfill are produced pollution to environment, both reduce raw materials cost, saved again limited Mineral resources; And in discarded molding sand, zirconia content is higher, is beneficial to the raising of light material thermal shock resistance energy; Production technique is also very simple, can use in the insulation of the brickwork of thermal technology's industries such as iron and steel, pottery through moulding, after burning till.Volume density 0.6～the 1.5g/cm of prepared mullite light heat-insulation brick
3, thermal conductivity 0.16～0.40w/ (mk) (600 ℃), compressive strength 3.1～16.8MPa, (1400 ℃ * 12h), can satisfy well present thermal technology's demand of industrial production of reheating linear change rate on reheating-0.1～-0.8%.
Therefore, the present invention has advantages of that production cost is low, technique is simple, energy-conserving and environment-protective and be easy to scale operation, prepared mullite light heat-insulation brick not only has higher compressive strength, better thermal shock resistance, lower volume density and less thermal conductivity, and has society and economic worth widely.
Embodiment
The invention will be further described below in conjunction with embodiment, is not the restriction to protection domain:
This embodiment is described below the improve parameter unification that will relate to, and will not give unnecessary details in embodiment:
The main chemical compositions of discarded molding sand is: SiO
2Content is 50～54wt%, Al
2O
3Content is 35～42wt%, ZrO
2Content is 4.0～7.0wt%; The particle diameter of discarded molding sand fine powder is less than 0.074 μ m, and the particle diameter of discarded molding sand particle is 0.10～0.30mm.
High grade bauxite and α-Al
2O
3Particle diameter all less than 0.088 μ m.
Embodiment 1
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.Be first that raw material mixes with the discarded molding sand fine powder of 40～50wt%, discarded molding sand particle and the high grade bauxite of 20～30wt% of 20～30wt%, add again the soft clay of described raw material 11～14wt%, the kyanite of 8～10wt%, Xylo-Mucine, 0.1～0.15wt% Sodium hexametaphosphate 99, the dextrin of 3～4wt%, the sawmilling of 20～30wt% and the water of 25～35wt% of 0.15～0.2wt%, mix, ageing mixture 5～8 hours, extrusion moulding, seasoning, through 110 ℃ of bakings 10～12 hours, be warming up to 1200～1250 ℃, be incubated 6～8 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 0.8～1.2g/cm
3, thermal conductivity is 0.21～0.32w/ (mk) (350 ℃), compressive strength 4.8～8.5Mpa, reheating linear change rate on reheating be-0.4～-0.6% (1400 ℃ * 12h).
Embodiment 2
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.Be first that raw material mixes with the discarded molding sand fine powder of 50～55wt%, discarded molding sand particle and the high grade bauxite of 30～35wt% of 15～20wt%, add again the soft clay of described raw material 8～11wt%, the kyanite of 7～9wt%, the tripoly phosphate sodium STPP of 0.3～0.5wt%, the dextrin of 2～3wt%, the sawmilling of 5～15wt% and the water of 15～25wt%, mix, ageing mixture 3～6 hours, the semidrying mechanical pressing, seasoning, through 110 ℃ of bakings 8～10 hours, be warming up to 1250～1300 ℃, be incubated 6～8 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 1.2～1.5g/cm
3, thermal conductivity is 0.29～0.40w/ (mk) (600 ℃), compressive strength 8.9～16.8Mpa, reheating linear change rate on reheating be-0.2～-0.35% (1400 ℃ * 12h).
Embodiment 3
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.First with the discarded molding sand fine powder of 55～60wt%, the discarded molding sand particle of 10～20wt% and α-Al of 20～35wt%
2O
3For raw material mixes, add again the soft clay of described raw material 7～9wt%, the kyanite of 5～7wt%, the Sodium hexametaphosphate 99 of 0.1～0.3wt%, the dextrin of 2～3wt%, the sawmilling of 15～20wt% and the water of 25～32wt%, mix, ageing mixture 6～9 hours, extrusion moulding, seasoning was through 110 ℃ of bakings 10～12 hours, be warming up to 1300～1350 ℃, be incubated 4～6 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 0.9～1.2g/cm
3, thermal conductivity is 0.26～0.35w/ (mk) (600 ℃), compressive strength 6.6～13.2Mpa, reheating linear change rate on reheating be-0.3～-0.4% (1400 ℃ * 12h).
Embodiment 4
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.Be first that raw material mixes with the discarded molding sand fine powder of 60～65wt%, discarded molding sand particle and the high grade bauxite of 20～30wt% of 5～10wt%, add again the soft clay of described raw material 6～8wt%, the kyanite of 2～5wt%, the Xylo-Mucine of 0.1～0.3wt%, the dextrin of 0.5～2wt%, the sawmilling of 25～30wt% and the water of 28～35wt%, mix, ageing mixture 7～10 hours, semidrying vibration extrusion forming, seasoning, through 110 ℃ of bakings 10～12 hours, be warming up to 1350～1400 ℃, be incubated 4～6 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 0.6～0.8g/cm
3, thermal conductivity is 0.16～0.27w/ (mk) (600 ℃), compressive strength 3.1～5.2Mpa, reheating linear change rate on reheating be-0.6～-0.8% (1400 ℃ * 12h).
Embodiment 5
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.First with the discarded molding sand fine powder of 65～70wt% and α-Al of 30～35wt%
2O
3For raw material mixes, add again the soft clay of described raw material 5～7wt%, the kyanite of 2～5wt%, the tripoly phosphate sodium STPP of 0.1～0.3wt%, the glucose of 0.5～2wt%, the sawmilling of 10～20wt% and the water of 25～35wt%, mix, ageing mixture 6～9 hours, semidrying vibration extrusion forming, seasoning was through 110 ℃ of bakings 10～12 hours, be warming up to 1400～1450 ℃, be incubated 2.5～4 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 0.7～0.8g/cm
3, thermal conductivity is 0.20～0.26w/ (mk) (600 ℃), compressive strength 3.5～5.0Mpa, reheating linear change rate on reheating be-0.55～-0.76% (1400 ℃ * 12h).
Embodiment 6
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.Be first that raw material mixes with the discarded molding sand fine powder of 48～52wt%, discarded molding sand particle and the high grade bauxite of 28～37wt% of 15～25wt%, add again the soft clay of described raw material 10～13wt%, the kyanite of 6～9wt%, Xylo-Mucine, 0.1～0.15wt% Sodium hexametaphosphate 99, the dextrin of 3～4wt%, the sawmilling of 10～15wt% and the water of 25～30wt% of 0.15～0.25wt%, mix, ageing mixture 3～6 o'clock, extrusion moulding, seasoning, through 110 ℃ of bakings 8～10 hours, be warming up to 1320～1400 ℃, be incubated 6～8 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 0.8～1.0g/cm
3, thermal conductivity is 0.21～0.28w/ (mk) (600 ℃), compressive strength 4.9～10.3Mpa, reheating linear change rate on reheating be-0.50～-0.65% (1400 ℃ * 12h).
Embodiment 7
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.Be first that raw material mixes with the discarded molding sand fine powder of 25～45wt%, discarded molding sand particle and the high grade bauxite of 35～55wt% of 20～35wt%, add again the soft clay of described raw material 13～15wt%, the kyanite of 8～10wt%, the Sodium hexametaphosphate 99 of 0.2～0.3wt%, the tripoly phosphate sodium STPP of 0.1～0.15wt%, the dextrin of 3～4wt%, the sawmilling of 15～20wt% and the water of 25～35wt%, mix, ageing mixture 6～9 hours, semidrying vibration extrusion forming, seasoning, through 110 ℃ of bakings 10～12 hours, be warming up to 1220～1280 ℃, be incubated 8～10 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 0.8～1.0g/cm
3, thermal conductivity is 0.22～0.25w/ (mk) (600 ℃), compressive strength 5.0～8.5Mpa, reheating linear change rate on reheating be-0.45～-0.60% (1400 ℃ * 12h).
Embodiment 8
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.First with the discarded molding sand fine powder of 30～45wt%, the discarded molding sand particle of 15～20wt% and α-Al of 35～55wt%
2O
3For raw material mixes, add again the soft clay of described raw material 12～15wt%, the kyanite of 7～9wt%, the Xylo-Mucine of 0.3～0.5wt%, the glucose of 3～4wt%, the sawmilling of 10～15wt% and the water of 20～30wt%, mix, ageing mixture 3～6 hours, semidrying vibration extrusion forming, seasoning was through 110 ℃ of bakings 8～10 hours, be warming up to 1200～1300 ℃, be incubated 4～6 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 0.8～0.9g/cm
3, thermal conductivity is 0.20～0.24w/ (mk) (600 ℃), compressive strength 4.7～6.6Mpa, reheating linear change rate on reheating be-0.5～-0.7% (1400 ℃ * 12h).
Embodiment 9
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.Be first that raw material mixes with the discarded molding sand fine powder of 40～50wt%, discarded molding sand particle and the high grade bauxite of 30～35wt% of 20～25wt%, add again the soft clay of described raw material 10～13wt%, the kyanite of 5～8wt%, the Xylo-Mucine of 0.1～0.2wt%, the tripoly phosphate sodium STPP of 0.1～0.2wt%, the dextrin of 3～4wt%, the powdered rice hulls of 1/8～30wt% and the water of 25～30wt%, mix, ageing mixture 7～10 hours, extrusion moulding, seasoning, through 110 ℃ of bakings 8～10 hours, be warming up to 1280～1350 ℃, be incubated 6～8 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 1.0～1.1g/cm
3, thermal conductivity is 0.2～0.30w/ (mk) (600 ℃), compressive strength 8.9～12.5Mpa, reheating linear change rate on reheating be-0.30～-0.40% (1400 ℃ * 12h).
Embodiment 10
A kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof.Be first that raw material mixes with the discarded molding sand fine powder of 45～60wt%, discarded molding sand particle and the high grade bauxite of 30～40wt% of 10～15wt%, add again the soft clay of described raw material 8～12wt%, the kyanite of 4～7wt%, the Sodium hexametaphosphate 99 of 0.3～0.5wt%, the glucose of 2～3wt%, the powdered rice hulls of 5～18wt% and the water of 15～25wt%, mix, ageing mixture 6～9 hours, the semidrying mechanical pressing, seasoning, through 110 ℃ of bakings 8～10 hours, be warming up to 1370～1450 ℃, be incubated 6～8 hours.
The prepared volume density based on the light mullite brick of discarding molding sand of the present embodiment is 1.1～1.3g/cm
3, thermal conductivity is 0.2～0.32w/ (mk) (600 ℃), compressive strength 9.0～9.9Mpa, reheating linear change rate on reheating be-0.1～-0.2% (1400 ℃ * 12h).
This embodiment main raw material used is the annual discarded molding sand that reaches more than 3,000 ten thousand tons, can effectively recycle discarding molding sand, avoid both having reduced raw materials cost because its direct stacking or landfill are produced pollution to environment, saved again limited Mineral resources; And in discarded molding sand, zirconia content is higher, is beneficial to the raising of light material thermal shock resistance energy; Production technique is also very simple, can use in the insulation of the brickwork of thermal technology's industries such as iron and steel, pottery through moulding, after burning till.Volume density 0.6～the 1.5g/cm of prepared mullite light heat-insulation brick
3, thermal conductivity 0.16～0.40w/ (mk) (600 ℃), compressive strength 3.1～16.8MPa, (1400 ℃ * 12h), can satisfy well present thermal technology's demand of industrial production of reheating linear change rate on reheating-0.1～-0.8%.
Therefore, this embodiment has advantages of that production cost is low, technique is simple, energy-conserving and environment-protective and be easy to scale operation, prepared mullite light heat-insulation brick not only has higher compressive strength, better thermal shock resistance, lower volume density and less thermal conductivity, and has society and economic worth widely.
Claims (8)
1. the preparation method based on the mullite light heat-insulation brick of discarded molding sand, is characterized in that first with the discarded molding sand of 45 ~ 80wt% and high grade bauxite or the α-Al of 20 ~ 55wt%
2O
3For raw material mixes, add again the kyanite of described raw material 2 ~ 10wt%, the soft clay of 5 ~ 15wt%, the pore-forming material of 5 ~ 30wt%, the softening agent of 0.5 ~ 4wt%, the wedding agent of 0.1 ~ 0.5wt% and the water of 15 ~ 35wt%, mix, ageing mixture 3 ~ 10 hours, moulding, seasoning was through 110 ℃ of bakings 8 ~ 12 hours, be warming up to 1200 ~ 1450 ℃, be incubated 2.5 ~ 10 hours.
2. the preparation method of the mullite light heat-insulation brick based on discarding molding sand according to claim 1, is characterized in that the main chemical compositions of described discarded molding sand is: SiO
2Content is 50 ~ 54wt%, Al
2O
3Content is 35 ~ 42wt%, ZrO
2Content is 4.0 ~ 7.0wt%; Discarded molding sand is fine powder or for fine powder and particle, the particle diameter of discarded molding sand fine powder is less than 0.074 μ m, and the particle diameter of discarded molding sand particle is 0.10 ~ 0.30mm.
3. the preparation method of the mullite light heat-insulation brick based on discarded molding sand according to claim 1 is characterized in that describedly being shaped to extrusion moulding or vibrating extrusion forming for the semidrying mechanical pressing or for semidrying.
4. the preparation method of the mullite light heat-insulation brick based on discarding molding sand according to claim 1, is characterized in that described high grade bauxite and α-Al
2O
3Particle diameter all less than 0.088 μ m.
5. the preparation method of the mullite light heat-insulation brick based on discarding molding sand according to claim 1, is characterized in that described pore-forming material is sawmilling or is powdered rice hulls.
6. the preparation method of the mullite light heat-insulation brick based on discarding molding sand according to claim 1, is characterized in that described wedding agent is one or both of tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and Xylo-Mucine.
7. the preparation method of the mullite light heat-insulation brick based on discarding molding sand according to claim 1, is characterized in that described softening agent is dextrin or is glucose.
8. the prepared mullite light heat-insulation brick of preparation method of the described mullite light heat-insulation brick based on discarded molding sand of any one according to claim 1 ~ 7.
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| CN103011856B (en) * | 2012-12-14 | 2014-02-26 | 武汉科技大学 | Mullite light insulating brick and preparation method thereof |
| CN103073275A (en) * | 2013-01-17 | 2013-05-01 | 武汉科技大学 | Abandoned sand-based mullite lightweight aggregate and preparation method thereof |
| CN103601525B (en) * | 2013-12-02 | 2016-01-20 | 武汉科技大学 | Based on the mullite light heat-insulation brick and preparation method thereof of high-voltage electric porcelain waste material |
| CN103951397B (en) * | 2014-04-08 | 2015-05-20 | 安徽省亚欧陶瓷有限责任公司 | Thermal-insulation ceramic tile having low thermal conductivity coefficient and preparation method thereof |
| CN104261849B (en) * | 2014-10-08 | 2016-06-08 | 江苏省陶瓷研究所有限公司 | A kind of containing zirconium mullite-vagcor composite diphase material and preparation method thereof |
| CN104261810B (en) * | 2014-10-08 | 2016-03-30 | 武汉科技大学 | A kind of containing zirconium mullite composite diphase material and preparation method thereof |
| CN108147827A (en) * | 2018-01-12 | 2018-06-12 | 安徽海螺暹罗耐火材料有限公司 | A kind of basic refractory bonding agent and preparation method thereof |
| CN109369203A (en) * | 2018-12-25 | 2019-02-22 | 郑州真金耐火材料有限责任公司 | Density mullite brick and preparation method thereof in high intensity |
| CN109650854A (en) * | 2018-12-25 | 2019-04-19 | 郑州真金耐火材料有限责任公司 | Corundum-mullite composite brick and preparation method thereof |
| CN110194673A (en) * | 2019-05-31 | 2019-09-03 | 武汉科技大学 | A kind of energy-saving mullite zirconium oxide multiple phase refractory material and preparation method thereof |
| CN111302773A (en) * | 2020-03-26 | 2020-06-19 | 攀枝花学院 | Preparation method of mullite porous ceramic |
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| JPS5835380A (en) * | 1981-08-27 | 1983-03-02 | 日本アスベスト株式会社 | Fibrous amorphous refractory heat insulating composition |
| CN101367666B (en) * | 2008-09-28 | 2012-05-23 | 瑞泰科技股份有限公司 | Large-sized special-shaped mullite-corundum series sintered refractory material product and production process thereof |
| CN101870562B (en) * | 2010-06-30 | 2012-05-02 | 泰州枫叶冶金设备有限公司 | Method for recycling waste sand in precision casting |
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