CN101066878A - Alumina-silica refractory brick containing light porous aggegate and its making process - Google Patents
Alumina-silica refractory brick containing light porous aggegate and its making process Download PDFInfo
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- CN101066878A CN101066878A CNA2007100524702A CN200710052470A CN101066878A CN 101066878 A CN101066878 A CN 101066878A CN A2007100524702 A CNA2007100524702 A CN A2007100524702A CN 200710052470 A CN200710052470 A CN 200710052470A CN 101066878 A CN101066878 A CN 101066878A
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Abstract
The present invention relates to one kind of alumina-silica refractory brick containing light porous aggregate and its production process. The technological scheme is that the alumina-silica refractory brick is produced with light porous Al2O3-SiO2 refractory material 30-70 wt%, compact Al2O3-SiO2 refractory material 0-35 wt%, fine corundum powder 5-25 wt%, fine alpha-Al2O3 powder 3-10 wt%, fine mullite powder 5-15 wt% and fine clay powder 0-10 wt%, and through mixture, adding waste pulp liquid in 3-7 wt% and one or two kinds of silicasol as binding agent, stirring, pressing to form adobe, drying at 100-150 deg.c for 12-48 hr, sintering at 1400-1600 deg.c for 2-5 hr and naturally cooling. The alumina-silica refractory brick has high macro porosity, small average pore size, low heat conductivity and high medium erosion resistance, and may be used in the permanent layer or work layer in high temperature kiln, furnace and container.
Description
Technical field
The invention belongs to technical field of refractory materials, be specifically related to a kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof.
Background technology
Along with the world to cutting down the consumption of energy and the requirement of energy savings improves day by day, more and more higher to the requirement of light heat insulation material.But traditional light heat insulation material such as diatomite brick, asbestos brick, vermiculite brick, light weight fireclay brick, light-weight mullite and lightweight corundum brick etc. can not use at the position that directly contacts with liquid or other media.Because its be vulnerable to the erosion of working medium and wash away (Xu Pingkun, Dong Yingbang. corundum refractory. Beijing: metallurgical industry press, 1999; Wang Weibang. fire-proof material technology. Beijing: metallurgical industry press, 1994), influence work-ing life, even have influence on the safety in production of high temperature kiln or container.On the other hand, people are aggregate with the material of densification often in traditional refractory materials, fine and close aggregate requires high temperature to burn till, consume a large amount of energy, and refractory materials in use, the slag equal solvent at first corrodes matrix, matrix surrounds aggregate, when matrix is etched into metamorphic layer, aggregate is (W.E.Lee and S.Zhang in matrix is from the shelling of refractory to the slag just, " Melt corrosion ofoxide and oxide-carbon refractories " International Materials Reviews 1999 Vol.44 No.3 77.), thereby the advantage function of fine and close aggregate and not obvious, also can cause certain waste.
Summary of the invention
The purpose of this invention is to provide a kind of apparent porosity height, mean pore size is little, thermal conductivity is low and anti-neutrality or acidic medium erosional competency are strong contains alumina-silica refractory brick of light porous aggregate and preparation method thereof.This refractory brick not only can use permanent layer at high temperature kiln or container, but also can use working lining at high temperature kiln or container.
To achieve these goals, the technical solution used in the present invention is: with the Al of 30～70wt%
2O
3-SiO
2Be the Al of light porous refractory material, 0～35wt%
2O
3-SiO
2Be the corundum fine powder of compact refractory material, 5～25wt%, α-Al of 3～10wt%
2O
3The well as clay fines of micro mist, 5～15wt% mullite fine powder, 0～10wt% is mixed, and adds the bond of 3～7wt%, stirs, through forcing press compression moulding; Or the biscuit after the moulding under 100～150 ℃ of conditions dry 12～48 hours, or the biscuit after the moulding under 100～150 ℃ of conditions dry 12～48 hours, under 1400 ℃～1600 ℃ conditions, to burn till, temperature retention time is 2～5 hours, naturally cools off.
Described Al
2O
3-SiO
2Be that light porous refractory materials is one or more in light porous corundum, light porous corundum-mullite, light porous mullite, light porous alumina, the light porous clay; Al
2O
3-SiO
2Be that light porous fire resisting material particle grating is, 5～3mm is that 15～35wt%, 3～1mm are 15～35wt%; Apparent porosity greater than 20%, mean pore size＜30 μ m.Wherein: the Al of light porous corundum
2O
3Content 〉=97wt%, the Al of light porous corundum-mullite
2O
3Content 〉=76wt%, the Al of light porous mullite
2O
3Content is 66～76wt%, the Al of light porous alumina
2O
3Content is 50～90wt%, the Al of light porous clay
2O
3Content is 30～50wt%.
Described Al
2O
3-SiO
2Be that compact refractory material is one or more in corundum, mullite, the alumina; Particle diameter is 0～1mm.Wherein: the Al of corundum
2O
3The Al of content 〉=95wt%, mullite
2O
3Content be the Al of 66～76wt%, alumina
2O
3Content be 50～90wt%.
The Al of described corundum fine powder
2O
3Content 〉=95wt%, the Al of mullite fine powder
2O
3Content 66～76wt%, the Al of well as clay fines
2O
3Content be 30～50wt%, particle diameter all＜88 μ m; α-Al
2O
3The Al of micro mist
2O
3Content 〉=97wt%, particle diameter＜5 μ m.
Described wedding agent is one or both in spent pulping liquor, the silicon sol; The concentration of silicon sol is 20～40wt%; Forming pressure is 100～150Mpa.
Since adopt technique scheme, the refractory brick that contains light porous aggregate that the present invention is prepared, its aggregate part mainly is made up of light porous refractory material, and matrix is mainly by corundum fine powder, mullite fine powder, well as clay fines, α-Al
2O
3Micro mist forms; It is different from traditional lightweight refracrory (all being made of porous material), also is different from traditional compact refractory material (the aggregate part all is made up of the lower refractory material of apparent porosity), and it contains light porous aggregate.Wherein, light porous aggregate is to use for reference " a kind of porous mullite ceramic materials and manufacture method thereof " (CN 200610019552.2) to produce, and it has, and void content height, mean pore size are little, even aperture distribution and advantages of high strength.
Because product of the present invention is with Al
2O
3-SiO
2Be that light porous material is aggregate, all or part of replacement Dense aggregate, and the control composition of matrix and structure are to obtain the preferably performance of heat-insulating property and slag corrosion resistance.Therefore, adopt the refractory brick that contains light porous aggregate of its preparation to have thermal and insulating performance is preferably arranged than conventional dense refractory materials, the erosion of media such as anti-slag preferably and the ability of washing away are arranged than traditional lightweight refractory materials, can be used on the position that directly contacts with media such as slags, not only can use permanent layer, but also can use working lining at high temperature kiln or container at high temperature kiln or container.
The product chemical composition that the present invention produces mainly is Al
2O
3With SiO
2, corresponding principal crystalline phase is corundum, or corundum-mullite, or mullite; The product that the present invention produces is a kind of apparent porosity height, bulk density is little, average pore size is little, thermal conductivity is little, anti-neutrality or the strong refractory product that contains light porous aggregate of acid medium erosiveness.
Four, embodiment
Embodiment 1
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous corundum (Al of 5～3mm with particle diameter
2O
3Content 〉=97wt%), particle diameter are the light porous corundum (Al of 3～1mm
2O
3Corundum fine powder (the Al of content 〉=97wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 66wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 30～35wt%, 25～30wt%, 15～20wt%, 5～10wt% and 5～10wt%; Wherein, the apparent porosity of light porous corundum greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is wedding agent, the back mechanical pressing that stirs, and forming pressure is 120～150Mpa, the base substrate after the moulding is following dry 16～24 hours at 120～140 ℃.Can obtain apparent porosity and be 40～45%, volume density is at 2.30～2.40g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 4.0～6.5Mpa.
Embodiment 2
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous mullite (Al of 5～3mm with particle diameter
2O
3Content is 66wt%), particle diameter is the light porous mullite (Al of 3～1mm
2O
3Content is 76wt%), particle diameter is the mullite (Al of 1～0mm
2O
3Content is 66wt%), the corundum fine powder (Al of particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 66wt%), well as clay fines (Al
2O
3Content is 30wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%), respectively mixed by 15～20wt%, 15～20wt%, 25～30wt%, 12～22wt%, 5～10wt%, 5～8wt% and 4～6wt%; Wherein, the apparent porosity of light porous mullite all greater than 20%, average pore size＜30 μ m.The concentration that adds 3～5wt% of above-mentioned compound again is that the silicon sol of 30～40wt% is that wedding agent mixes, mechanical pressing, forming pressure 100～130Mpa.Base substrate after the moulding is following dry 24～48 hours at 100～130 ℃.Can obtain apparent porosity and be 37～45%, volume density is at 2.35～2.40g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 5.2～6.9Mpa.
Embodiment 3
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous mullite (Al of 5～3mm with particle diameter
2O
3Content is 76wt%), particle diameter is the light porous mullite (Al of 3～1mm
2O
3Content is 66wt%), the corundum fine powder (Al of particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 66wt%), well as clay fines (Al
2O
3Content is 40wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 30～35wt%, 25～30wt%, 5～10wt%, 10～15wt%, 5～10wt% and 8～10wt%; Wherein, the apparent porosity of light porous mullite all greater than 20%, average pore size＜30 μ m.The concentration that adds 3～5wt% of above-mentioned compound again is that the silicon sol of 30～35wt% is that wedding agent mixes, mechanical pressing, forming pressure 130～150Mpa.Base substrate after the moulding 130～150 ℃ dry 12～24 hours down, can obtain apparent porosity and be 38～42%, volume density is at 2.38～2.52g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 5.7～7.9Mpa.
Embodiment 4
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous corundum-mullite (Al of 5～3mm with particle diameter
2O
3Content is 80wt%), particle diameter is the light porous corundum-mullite (Al of 3～1mm
2O
3Content is 90wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 76wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 15～20wt%, 20～25wt%, 25～30wt%, 20～25wt%, 5～8wt% and 8～10wt%; Wherein, the apparent porosity of light porous corundum-mullite all greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is that wedding agent mixes, mechanical pressing, forming pressure 110～150Mpa.Base substrate after the moulding is following dry 16～32 hours at 120～140 ℃.Can obtain apparent porosity and be 35～38%, volume density is at 2.55～2.60g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 8.2～10.9Mpa.
Embodiment 5
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous alumina (Al of 5～3mm with particle diameter
2O
3Content is 50wt%), particle diameter is the light porous alumina (Al of 3～1mm
2O
3Content is 88wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 76wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 15～20wt%, 20～25wt%, 25～30wt%, 20～25wt%, 5～8wt% and 8～10wt%; Wherein, the apparent porosity of light porous alumina all greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is that wedding agent mixes, mechanical pressing, forming pressure 130～150Mpa.Base substrate after the moulding is following dry 24～48 hours at 110～140 ℃.Can obtain apparent porosity and be 43～48%, volume density is at 2.32～2.41g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 4.9～6.5Mpa.
Embodiment 6
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous clay (Al of 5～3mm with particle diameter
2O
3Content is 30wt%), particle diameter is the light porous alumina (Al of 3～1mm
2O
3Content is 88wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 73wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 20～25wt%, 20～25wt%, 20～25wt%, 20～25wt%, 5～8wt% and 5～8wt%; Wherein, the apparent porosity of light porous clay and light porous alumina all greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is that wedding agent mixes, mechanical pressing, forming pressure 110～130Mpa.Base substrate after the moulding 120～150 ℃ dry 24～36 hours down, can obtain apparent porosity and be 40～45%, volume density is at 2.32～2.40g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 3.6～5.5Mpa.
Embodiment 7
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous alumina (Al of 5～3mm with particle diameter
2O
3Content is 88wt%), particle diameter is the light porous alumina (Al of 3～1mm
2O
3Content is 88wt%), the corundum fine powder (Al of particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 73wt%), α-Al of well as clay fines and particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 30～35wt%, 30～35wt%, 5～10wt%, 10～15wt%, 5～10wt% and 8～10wt%; Wherein, the apparent porosity of light porous alumina greater than 20%, average pore size＜30 μ m.The concentration that adds 3～5wt% of above-mentioned compound again is that the silicon sol of 25～35wt% is that wedding agent mixes, mechanical pressing, forming pressure 110～130Mpa.Base substrate after the moulding 120～150 ℃ down dry 12～36, can obtain apparent porosity and be 43～48%, volume density is at 2.28～2.35g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 4.6～7.5Mpa.
Embodiment 8
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous clay (Al of 5～3mm with particle diameter
2O
3Content is 50wt%), particle diameter is the light porous clay (Al of 3～1mm
2O
3Content is 50wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 76wt%), well as clay fines (Al
2O
3Content is 50wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 25～30wt%, 15～20wt%, 25～30wt%, 15～20wt%, 5～10wt%, 5～8wt% and 4～6wt%; Wherein, the apparent porosity of light porous clay greater than 20%, average pore size＜30 μ m.The concentration that adds the spent pulping liquor of 3wt% of above-mentioned compound and 3wt% again is that the silicon sol of 20～30wt% is that wedding agent mixes, mechanical pressing, forming pressure 120～130Mpa.Base substrate after the moulding 120～140 ℃ dry 24～36 hours down, can obtain apparent porosity and be 35～38%, volume density is at 2.35～2.40g/cm
3, folding strength is the alumina-silica non-burning refractory brick that contains light porous aggregate of 7.2～10.3Mpa.
Embodiment 9
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous corundum (Al of 5～3mm with particle diameter
2O
3Content 〉=97wt%), particle diameter are the light porous corundum (Al of 3～1mm
2O
3Corundum fine powder (the Al of content 〉=97wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 66wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 30～35wt%, 25～30wt%, 15～20wt%, 5～10wt% and 5～10wt%; Wherein, the apparent porosity of light porous corundum greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is wedding agent, the back mechanical pressing that stirs, and forming pressure is 120～150Mpa, base substrate after the moulding is following dry 16～24 hours at 120～140 ℃, burn till under 1400～1600 ℃, soaking time is 3 hours, naturally cooling again.Can obtain apparent porosity and be 42～48%, volume density is at 2.28～2.35g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 6.0～8.5Mpa burns till refractory brick.
Embodiment 10
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous mullite (Al of 5～3mm with particle diameter
2O
3Content is 66wt%), particle diameter is the light porous mullite (Al of 3～1mm
2O
3Content is 76wt%), particle diameter is the mullite (Al of 1～0mm
2O
3Content is 66wt%), the corundum fine powder (Al of particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 66wt%), well as clay fines (Al
2O
3Content is 30wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 15～20wt%, 15～20wt%, 25～30wt%, 12～22wt%, 5～10wt%, 5～8wt% and 4～6wt%; Wherein, the apparent porosity of light porous mullite all greater than 20%, average pore size＜30 μ m.The concentration that adds 3～5wt% of above-mentioned compound again is that the silicon sol of 30～40wt% is that wedding agent mixes, mechanical pressing, forming pressure 100～130Mpa.Base substrate after the moulding descended dry 24～48 hours at 100～130 ℃, burnt till under 1500～1600 ℃ again, and soaking time is 3 hours, naturally cooling.Can obtain apparent porosity and be 43～47%, volume density is at 2.31～2.39g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 6.2～7.4Mpa burns till refractory brick.
Embodiment 11
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous mullite (Al of 5～3mm with particle diameter
2O
3Content is 76wt%), particle diameter is the light porous mullite (Al of 3～1mm
2O
3Content is 66wt%), the corundum fine powder (Al of particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 66wt%), well as clay fines (Al
2O
3Content is 40wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 30～35wt%, 25～30wt%, 5～10wt%, 10～15wt%, 5～10wt% and 8～10wt%; Wherein, the apparent porosity of light porous mullite all greater than 20%, average pore size＜30 μ m.The silicon sol that adds 3～5wt% of above-mentioned compound again is that wedding agent mixes, mechanical pressing, forming pressure 130～150Mpa.Base substrate after the moulding descended dry 12～24 hours at 130～150 ℃, burnt till under 1400～1600 ℃ again, and soaking time is 3 hours, naturally cooling.Can obtain apparent porosity and be 39～42%, volume density is at 2.36～2.51g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 6.7～9.7Mpa burns till refractory brick.
Embodiment 12
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous corundum-mullite (Al of 5～3mm with particle diameter
2O
3Content is 80wt%), particle diameter is the light porous corundum-mullite (Al of 3～1mm
2O
3Content is 90wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 76wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 15～20wt%, 20～25wt%, 25～30wt%, 20～25wt%, 5～8wt% and 8～10wt%; Wherein, the apparent porosity of light porous corundum-mullite all greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is that wedding agent mixes, mechanical pressing, forming pressure 100～150Mpa.Base substrate after the moulding descended dry 16～32 hours at 120～140 ℃, burnt till under 1400～1600 ℃ again, and soaking time is 3 hours, naturally cooling.Can obtain apparent porosity and be 35～40%, volume density is at 2.52～2.58g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 8.5～9.5Mpa burns till refractory brick.
Embodiment 13
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous alumina (Al of 5～3mm with particle diameter
2O
3Content is 50wt%), particle diameter is the light porous alumina (Al of 3～1mm
2O
3Content is 88wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 76wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 15～20wt%, 20～25wt%, 25～30wt%, 20～25wt%, 5～8wt% and 8～10wt%; Wherein, the apparent porosity of light porous clay all greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is that wedding agent mixes, mechanical pressing, forming pressure 130～150Mpa.Base substrate after the moulding descended dry 24～48 hours at 110～140 ℃, burnt till under 1400～1600 ℃ again, and soaking time is 3 hours, naturally cooling.Can obtain apparent porosity and be 38～42%, volume density is at 2.42～2.55g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 7.9～10.5Mpa burns till refractory brick.
Embodiment 14
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous clay (Al of 5～3mm with particle diameter
2O
3Content is 30wt%), particle diameter is the light porous alumina (Al of 3～1mm
2O
3Content is 88wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 73wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 20～25wt%, 20～25wt%, 20～25wt%, 20～25wt%, 5～8wt% and 5～8wt%; Wherein, the apparent porosity of light porous clay and light porous alumina all greater than 20%, average pore size＜30 μ m.The spent pulping liquor that adds 3～5wt% of above-mentioned compound again is that wedding agent mixes, mechanical pressing, forming pressure 110～130Mpa.Base substrate after the moulding descended dry 24～36 hours at 120～150 ℃, burnt till under 1400～1600 ℃ again, and soaking time is 3 hours, naturally cooling.Can obtain apparent porosity and be 35～38%, volume density is at 2.45～2.55g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 7.6～11.5Mpa burns till refractory brick.
Embodiment 15
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous alumina (Al of 5～3mm with particle diameter
2O
3Content is 88wt%), particle diameter is the light porous alumina (Al of 3～1mm
2O
3Content is 88wt%), the corundum fine powder (Al of particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 73wt%), α-Al of well as clay fines and particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 30～35wt%, 30～35wt%, 5～10wt%, 10～15wt%, 5～10wt% and 8～10wt%; Wherein, the apparent porosity of light porous alumina greater than 20%, average pore size＜30 μ m.The concentration that adds 3～5wt% of above-mentioned compound again is that the silicon sol of 30～40wt% is that wedding agent mixes, mechanical pressing, forming pressure 110～130Mpa.Base substrate after the moulding is drying 12～36 under 120～150 ℃, burns till under 1400～1600 ℃ again, and soaking time is 3 hours, naturally cooling.Can obtain apparent porosity and be 35～40%, volume density is at 2.45～2.55g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 7.6～9.5Mpa burns till refractory brick.
Embodiment 16
A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof: be the light porous clay (Al of 5～3mm with particle diameter
2O
3Content is 50wt%), particle diameter is the light porous clay (Al of 3～1mm
2O
3Content is 50wt%), particle diameter is the corundum (Al of 1～0mm
2O
3Corundum fine powder (the Al of content 〉=95wt%), particle diameter＜88 μ m
2O
3Content 〉=95wt%), mullite fine powder (Al
2O
3Content is 76wt%), well as clay fines (Al
2O
3Content is 50wt%) and α-Al of particle diameter＜5 μ m
2O
3Micro mist (Al
2O
3Content 〉=97wt%) respectively mixed by 25～30wt%, 15～20wt%, 25～30wt%, 15～20wt%, 5～10wt%, 5～8wt% and 4～6wt%; Wherein, the apparent porosity of light porous clay greater than 20%, average pore size＜30 μ m.The concentration that adds the spent pulping liquor of 3wt% of above-mentioned compound and 3wt% again is that the silicon sol of 25～35wt% is that wedding agent mixes,, mechanical pressing, forming pressure 120～130Mpa.Base substrate after the moulding descended dry 24～36 hours at 120～140 ℃, burnt till under 1400～1600 ℃ again, and soaking time is 3 hours, naturally cooling.Can obtain apparent porosity and be 30～35%, volume density is at 2.45～2.55g/cm
3, folding strength is that the alumina-silica that contains light porous aggregate of 8.2～9.3Mpa burns till refractory brick.
Claims (9)
1, a kind of preparation method who contains the alumina-silica refractory brick of light porous aggregate is characterized in that the Al with 30～70wt%
2O
3-SiO
2Be the Al of light porous refractory material, 0～35wt%
2O
3-SiO
2Be the corundum fine powder of compact refractory material, 5～25wt%, α-Al of 3～10wt%
2O
3The well as clay fines of micro mist, 5～15wt% mullite fine powder, 0～10wt% is mixed, and adds the bond of 3～7wt%, stirs, through forcing press compression moulding; Or the biscuit after the moulding under 100～150 ℃ of conditions dry 12～48 hours, or the biscuit after the moulding under 100～150 ℃ of conditions dry 12～48 hours, under 1400 ℃～1600 ℃ conditions, to burn till, temperature retention time is 2～5 hours, naturally cools off.
2, the preparation method who contains the alumina-silica refractory brick of light porous aggregate according to claim 1 is characterized in that described Al
2O
3-SiO
2Be that light porous refractory materials is one or more in light porous corundum, light porous corundum-mullite, light porous mullite, light porous alumina, the light porous clay; Al
2O
3-SiO
2Be that light porous fire resisting material particle grating is, 5～3mm is that 15～35wt%, 3～1mm are 15～35wt%; Apparent porosity greater than 20%, mean pore size＜30 μ m.
3, the preparation method who contains the alumina-silica refractory brick of light porous aggregate according to claim 2 is characterized in that the Al of described light porous corundum
2O
3Content 〉=97wt%, the Al of light porous corundum-mullite
2O
3Content 〉=76wt%, the Al of light porous mullite
2O
3Content is 66～76wt%, the Al of light porous alumina
2O
3Content is 50～90wt%, the Al of light porous clay
2O
3Content is 30～50wt%.
4, the preparation method who contains the alumina-silica refractory brick of light porous aggregate according to claim 1 is characterized in that described Al
2O
3-SiO
2Be that compact refractory material is one or more in corundum, mullite, the alumina; Particle diameter is 0～1mm.
5, the preparation method who contains the alumina-silica refractory brick of light porous aggregate according to claim 4 is characterized in that the Al of described corundum
2O
3The Al of content 〉=95wt%, mullite
2O
3Content be the Al of 66～76wt%, alumina
2O
3Content be 50～90wt%.
6, the preparation method who contains the alumina-silica refractory brick of light porous aggregate according to claim 1 is characterized in that the Al of described corundum fine powder
2O
3Content 〉=95wt%, the Al of mullite fine powder
2O
3Content 66～76wt%, the Al of well as clay fines
2O
3Content be 30～50wt%, particle diameter all＜88 μ m; α-Al
2O
3The Al of micro mist
2O
3Content 〉=97wt%, particle diameter＜5 μ m.
7, the preparation method who contains the alumina-silica refractory brick of light porous aggregate according to claim 1 is characterized in that described wedding agent is one or both in spent pulping liquor, the silicon sol; The concentration of silicon sol is 20～40wt%.
8, the preparation method who contains the alumina-silica refractory brick of light porous aggregate according to claim 1 is characterized in that described forming pressure is 100～150Mpa.
9, according to each described prepared alumina-silica refractory brick that contains light porous aggregate of preparation method that contains the alumina-silica refractory brick of light porous aggregate in the claim 1,2,4,6,7,8.
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| CNB2007100524702A CN100564318C (en) | 2007-06-14 | 2007-06-14 | A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof |
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| CNB2007100524702A CN100564318C (en) | 2007-06-14 | 2007-06-14 | A kind of alumina-silica refractory brick that contains light porous aggregate and preparation method thereof |
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