CN103058687A - Middle-density high-alumina brick for revolving kiln and preparation method of brick - Google Patents
Middle-density high-alumina brick for revolving kiln and preparation method of brick Download PDFInfo
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Abstract
The invention discloses a middle-density high-alumina brick for a revolving kiln. The components of the middle-density high-alumina brick comprise alumina, granule, powder and binding agent; the components of the middle-density high-alumina brick for the revolving kiln further comprise lightweight aggregate; moreover, the alumina in the middle-density high-alumina brick for the revolving kiln is 65wt%-85wt%. Preferably, the adopted lightweight aggregate is at least one of corundum hollow sphere, alumina hollow sphere, titanium-aluminum hollow sphere, chrome corundum hollow sphere, mullite hollow sphere, lightweight ceramsite, lightweight aluminum aggregate and light mullite aggregate; and the grain size specification of the lightweight aggregate is at least one of 0mm-1mm, 0mm-3mm, and 0mm-5mm. The middle-density high-alumina brick for the revolving kiln has the advantages of a low heat conductivity coefficient, good thermal shock resistance and light weight. The invention further discloses a preparation method of the middle-density high-alumina brick for the revolving kiln.
Description
Technical field
The present invention relates to technical field of refractory materials, especially relate to density high alumina brick in a kind of rotary kiln usefulness.The invention still further relates to the preparation method of density high alumina brick in this rotary kiln usefulness.
Background technology
Along with the continuous appearance of manufacture of cement new technology, the manufacture of cement main process equipment increases output, improves quality, saves energy and reduce the cost, reduces cost becomes increases benefit in the production management key to the maximization future development.Existing refractory brick and insulating brick are single structure mostly, need during use the brick of various performances is used in conjunction with, if on relatively fixed equipment, such as tunnel furnace, down-draft kiln, are used in conjunction with and can both meet the demands; But on the equipment of some relative movement, such as rotary kiln, be used in conjunction with and just be difficult to meet the demands.Some producers and research unit are studied this and tackle key problems, and have released the composite brick that some heavys and lightweight combine, but because lightweight working lining structural strength is excessively low, and can't satisfy service requirements and do not promote on a large scale, or take the heavy brick as main.Transitional zone uses spinel brick, clinkering zone to use magnesia chrome brick before the present existing rotary kiln, since the thermal conductivity of the magnesia chrome brick that spinel brick and clinkering zone use large (〉=2.7W/mK), so that kiln cylinder body outside wall temperature higher (about about 380 ℃, can reach 420 ℃ during high temperature greatly).The cylinder body outer wall temperature is higher, the kiln cylinder body heat radiation is increased, thereby strengthen heat consumption of clinker, causes that the grog unit cost increases; Very easily make on the other hand the cylindrical shell expanded by heating, cause kiln middle part support roller Wa Wendu to raise, especially using the normal operation to equipment of later stage or summer to bring larger hidden danger.Cylindrical shell is the excessively heat gain damage probability of mechanical means, accelerated barrel distortion, and barrel distortion has accelerated the physical disturbance of liner, consequently falls brick, stop kiln, affects the operation factor of cement rotary kiln.If therefore can use at this position composite brick fire-resistant, heat insulation dual-use function that the barrel temperature at transitional zone position is reduced, reduce heat lost by radiation, and be conducive to maintenance of the equipment, improve operation rate.Although use heavy lightweight stratiform composite brick can obviously reduce heat lost by radiation, but the bonding strength between heavy layer and the light layer and Performance Match require very high to preparation technology, the present invention reduces product density by introduce aglite in the high-density high alumina brick, then can avoid this problem to produce, reduce the production technology process requirement, and can reach same energy-saving effect.
Summary of the invention
The purpose of this invention is to provide density high alumina brick in a kind of rotary kiln usefulness, it has, and thermal conductivity is low, thermal shock resistance good, lightweight characteristics.The invention also discloses the preparation method of density high alumina brick in this rotary kiln usefulness.
The technical solution adopted in the present invention is: density high alumina brick during rotary kiln is used, its component comprises particulate material, powder, aglite, wedding agent, and the weight percentage of aluminum oxide is 65 ~ 85% in this particulate material.
The density of density high alumina brick was during described rotary kiln was used: 1.8 ~ 2.3g/cm3.
Described aglite is at least a in corundum bollow ball, alumina hollow ball, aluminium titanium hollow ball, Magnalium hollow ball, hollow chrome corundum spheres, Zirconia corundum hollow sphere, mullite hollow ball, light ceramic, lightweight bauxites aggregate, the light-weight mullite aggregate.
The granularity specification of described aglite is at least a among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
Described particulate material comprises the alumine of 3 ~ 8mm, the alumine of 0～3mm.
Described powder includes: be not more than 180 purpose mullite powders, be not more than 180 purpose andaluzite powder, be not more than 180 purpose sillimanite powder, be not more than a kind of in the 180 purpose aquamaine stone flours and be not more than 180 purpose clays and be not more than 180 purpose alumines.
Described wedding agent is a kind of in phosphoric acid solution, yellow starch gum solution, lignin sulfonic acid salts solution, the methocel solution.
Described rotary kiln with in the component of density high alumina brick, by weight, include: 14 ~ 24 parts of the alumines of 25 ~ 30 parts of the alumines of 10 ~ 30 parts of aglites, 3 ~ 8mm, 0～3mm, be not more than 4 ~ 6 parts of 180 purpose clays, be not more than 19 ~ 27 parts of 180 purpose alumines, 5～8 parts of wedding agents and be not more than 180 purpose mullite powders, be not more than 180 purpose andaluzite powder, be not more than 180 purpose sillimanite powder, be not more than at least a 4 ~ 10 parts in the 180 purpose aquamaine stone flours.
Rotary kiln of the present invention with in the advantage of density high alumina brick be: thermal conductivity is low, thermal shock resistance good, lightweight.The density high alumina brick increased aglite and has reduced product density during rotary kiln of the present invention was used in high-density high alumina brick component commonly used.Simultaneously, because the thermal conductivity of aglite is lower, make then that density high alumina brick has lower thermal conductivity in this.And aglite can with the preferably combination of other components, thereby should in the thermal shock resistance of density high alumina brick better.After tested, the density of density high alumina brick was 1.8 ~ 2.3g/cm during this rotary kiln was used
3, thermal conductivity is 0.9 ~ 1.3W/m.k, all is lower than mean density and the thermal conductivity of high-density high alumina brick.And the compressive strength of density high alumina brick is not less than 40MPa in this rotary kiln usefulness, can satisfy the needs of actual use.That is: this rotary kiln with in can reduce heat lost by radiation in the use procedure of density high alumina brick, reduce the energy and equipment dynamic consumption, play the effect that improves Working environment and energy-saving and emission-reduction.
The preparation method of density high alumina brick during this rotary kiln is used may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, add in proportion again powder stirring even;
B, moulding: the equal refining that steps A is formed adds in the mould mechanical pressing;
C, drying and burn till: the base substrate that step B is formed is after 80～150oC oven dry, and loading of kiln forms finished product in 1400～1580oC insulation, 3～8h.
The breakage rate of aglite is not more than 15% in the described mechanical pressing.
The method guaranteed preferably this rotary kiln with in the mass parameter of density high alumina brick, and processing parameter, method, equipment all have no special requirements, and is easy to realize.
Embodiment
The following stated only is preferred embodiment of the present invention, does not therefore limit protection scope of the present invention.
In following examples: rotary kiln with in the density high alumina brick, its component comprises aluminum oxide and particulate material, powder, wedding agent, aglite.Make the density of density high alumina brick in this rotary kiln usefulness be by adding aglite and mechanical pressing: 1.8 ~ 2.3g/cm
3
Preferred aglite is at least a in corundum bollow ball, alumina hollow ball, aluminium titanium hollow ball, Magnalium hollow ball, hollow chrome corundum spheres, Zirconia corundum hollow sphere, mullite hollow ball, light ceramic, lightweight bauxites aggregate, the light-weight mullite aggregate.
The granularity specification of preferred aglite is at least a among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
Preferred particulate material comprises the alumine of 3 ~ 8mm, the alumine of 0～3mm.
Preferred powder includes: be not more than 180 purpose mullite powders, be not more than 180 purpose andaluzite powder, be not more than 180 purpose sillimanite powder, be not more than at least a in the 180 purpose aquamaine stone flours and be not more than 180 purpose clays and be not more than 180 purpose alumines.
Preferred wedding agent is a kind of in phosphoric acid solution, yellow starch gum solution, lignin sulfonic acid salts solution, the methocel solution.
Embodiment 1
The raw material that adopts in the present embodiment by weight, and is as follows: 14 parts of the alumines of 25 parts of the alumines of 3 ~ 8mm, 0～3mm, be not more than 23 parts of 180 purpose alumines, be not more than 4 parts of 180 purpose mullite powders, be not more than 4 parts of 180 purpose clays, 30 parts of 0 ~ 5mm corundum bollow balls, add 7 parts of wedding agent phosphoric acid solutions.The quality of alumina percentage composition is 88% in the alumine, by the rotary kiln of this prescription preparation with in the density high alumina brick quality of alumina percentage composition be 85%.The preparation method may further comprise the steps: A, batching: after particulate material and aglite and wedding agent are mixed in proportion, add in proportion powder stirring even again; B, moulding: the equal refining that steps A is formed adds in the mould, and vibrating forming is base substrate on the vibrations press, and vibrations pressure is 4 tons, and product density is 1.8g/cm
3, hollow ball percentage of damage 15%; C, drying and burn till: the base substrate that step B is formed after the 80oC oven dry, loading of kiln in 1580oC insulation 3h form the finished product rotary kiln with in the density high alumina brick.
In the present embodiment: the granularity of corundum bollow ball can be 0 ~ 1mm or 0 ~ 3mm, also can be the mixture of at least 2 kinds arbitrary proportion in 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm corundum bollow ball.
Embodiment 2
The raw material that adopts in the present embodiment is by weight, and is as follows: 14 parts of the alumines of 25 parts of the alumines of 3 ~ 8mm, 0～3mm, be not more than 27 parts of 180 purpose alumines, be not more than 180 purpose mullites, sillimanite, andaluzite and kyanite arbitrary proportion 10 parts of mixing composite powders, be not more than 6 parts of 180 purpose clays, 18 parts of 0 ~ 5mm corundum-mullite hollow balls, add 6 parts of wedding agent yellow starch gum solution.The quality of alumina percentage composition is 88% in the alumine, by the rotary kiln of this prescription preparation with in the density high alumina brick quality of alumina percentage composition be 85%.The preparation method may further comprise the steps: A, batching: after particulate material and aglite and wedding agent are mixed in proportion, add in proportion powder stirring even again; B, moulding: the equal refining that steps A is formed adds in the mould, fixed stroke moulding on friction press, and product density is 2.1g/cm3, hollow ball percentage of damage 10%; C, drying and burn till: the base substrate that step B is formed after the 150oC oven dry, loading of kiln in 1450oC insulation 8h form the finished product rotary kiln with in the density high alumina brick.
In the present embodiment: the granularity of corundum-mullite hollow ball can be 0 ~ 1mm or 0 ~ 3mm, also can be the mixture of at least 2 kinds arbitrary proportion in 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm corundum-mullite hollow ball.
Embodiment 3
The raw material that adopts in the present embodiment by weight, and is as follows: 24 parts of the alumines of 30 parts of the alumines of 3 ~ 8mm, 0～3mm, be not more than 25 parts of 180 purpose alumines, be not more than 180 6 parts in purpose sillimanite powder, be not more than 5 parts of 180 purpose clays, 4 parts of 0 ~ 3mm alumina hollow balls, 4 parts of 0 ~ 1mm aluminium titanium hollow balls, 2 parts of 0 ~ 1mm Magnalium hollow balls, add 5 parts of wedding agent phosphoric acid solutions.The quality of alumina percentage composition is 85% in the alumine, by the rotary kiln of this prescription preparation with in the density high alumina brick quality of alumina percentage composition be 81%.The preparation method who adopts may further comprise the steps: A, batching: after particulate material and aglite and wedding agent are mixed in proportion, add in proportion powder stirring even again; B, moulding: the equal refining that steps A is formed adds in the mould, adopts 300 tons of press impact briquettings, and the control stroke keeps product size to fix, and it is 2.3g/cm3 that product reaches density, and the aglite percentage of damage is 2%; C, drying and burn till: the base substrate that step B is formed after the 120oC oven dry, loading of kiln in 1400oC insulation 5h form the finished product rotary kiln with in the density high alumina brick.
In the present embodiment: the granularity of Magnalium hollow ball can be 0 ~ 5mm or 0 ~ 3mm, also can be the mixture of at least 2 kinds arbitrary proportion in 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm Magnalium hollow ball.
Embodiment 4
The raw material that adopts in the present embodiment by weight, and is as follows: 18 parts of the alumines of 27 parts of the alumines of 3 ~ 8mm, 0～3mm, be not more than 19 parts of 180 purpose alumines, be not more than 180 7 parts in purpose andaluzite powder, be not more than 6 parts of 180 purpose clays, 5 parts of 0 ~ 3mm hollow chrome corundum spheres, 18 parts of 0 ~ 3mm Zirconia corundum hollow spheres, add 7 parts of wedding agent lignin sulfonic acid salts solutions.The quality of alumina percentage composition is 82% in the alumine, by the rotary kiln of this prescription preparation with in the density high alumina brick quality of alumina percentage composition be 76%.The preparation method may further comprise the steps: A, batching: after particulate material and aglite and wedding agent are mixed in proportion, add in proportion powder stirring even again; B, moulding: the equal refining that steps A is formed adds in the fixing mould of size, and vibrating forming is base substrate on the vibrations press, and product density is 1.9g/cm3, and the aglite percentage of damage is 5%; C, drying and burn till: the base substrate that step B is formed after the 100oC oven dry, loading of kiln in 1500oC insulation 6h form the finished product rotary kiln with in the density high alumina brick.
In the present embodiment: the granularity of hollow chrome corundum spheres can be 0 ~ 1mm or 0 ~ 5mm, also can be the mixture of at least 2 kinds arbitrary proportion in 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm hollow chrome corundum spheres.
Embodiment 5
The raw material that adopts in the present embodiment by weight, and is as follows: 23 parts of the alumines of 26 parts of the alumines of 3 ~ 8mm, 0～3mm, be not more than 21 parts of 180 purpose alumines, be not more than 180 5 parts of purpose aquamaine stone flours, be not more than 5 parts of 180 purpose clays, 11 parts of 0 ~ 5mm corundum-mullite hollow balls, 4 parts of 0 ~ 3mm light ceramics, 3 parts in 0 ~ 1mm light-weight mullite aggregate, 2 parts of lightweight bauxites aggregates, add 8 parts of wedding agent methocel solutions.The quality of alumina percentage composition is 75% in the alumine, by the rotary kiln of this prescription preparation with in the density high alumina brick quality of alumina percentage composition be 65%.The preparation method who adopts may further comprise the steps: A, batching: after particulate material and aglite and wedding agent are mixed in proportion, add in proportion powder stirring even again; B, moulding: the equal refining that steps A is formed adds in the mould, adopts the moulding of 150 tons of press oil pressure, and the control stroke keeps product size to fix, and product density is 2.0 g/cm3, and the aglite percentage of damage is 11%; C, drying and burn till: the base substrate that step B is formed after the 100oC oven dry, loading of kiln in 1400oC insulation 4h form the finished product rotary kiln with in the density high alumina brick.
Embodiment 6
Be with the difference of embodiment 1: corundum bollow ball replaces with aluminium titanium hollow ball, and the granularity specification is taked among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm any one; Being not more than 180 purpose mullite powders replaces with 180 purpose mullite powders and the mixture that is not more than 180 purpose andaluzite powder arbitrary proportions.
Embodiment 7
Be with the difference of embodiment 2: the corundum-mullite hollow ball replaces with Magnalium hollow ball, and the granularity specification is taked among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm any one; The mixing composite powder that is not more than 180 purpose mullites, sillimanite, andaluzite and kyanite arbitrary proportion be not more than 180 purpose andaluzite powder, be not more than 180 purpose sillimanite powder, the mixture that is not more than 180 purpose aquamaine stone flour arbitrary proportions replaces.
Embodiment 8
Be with the difference of embodiment 3: alumina hollow ball, aluminium titanium hollow ball, Magnalium hollow ball replace with Zirconia corundum hollow sphere, and the granularity specification is taked among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm any one; Being not more than 180 purpose sillimanite powder replaces with the mixture that is not more than 180 purpose sillimanite powder arbitrary proportions to be not more than 180 order andaluzite powder.
Embodiment 9
Be with the difference of embodiment 4: hollow chrome corundum spheres replaces with the mixture of two kinds arbitrary proportion in corundum bollow ball, alumina hollow ball, aluminium titanium hollow ball, Magnalium hollow ball, hollow chrome corundum spheres, Zirconia corundum hollow sphere, mullite hollow ball, light ceramic, lightweight bauxites aggregate, the light-weight mullite aggregate at least, and the granularity specification is got at least a arbitrary proportion among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm; Being not more than 180 purpose andaluzite powder replaces with the mixture that is not more than 180 purpose aquamaine stone flour arbitrary proportions to be not more than 180 purpose sillimanite powder.
Embodiment 10
Be with the difference of embodiment 5: be not more than 180 purpose aquamaine stone flours be not more than 180 purpose mullite powders, be not more than 180 purpose andaluzite powder, the mixture that is not more than 180 purpose sillimanite powder arbitrary proportions replaces.
Embodiment 11
Be with the difference of embodiment 1: be not more than 180 purpose mullite powders with the sillimanite powder, be not more than 180 purpose aquamaine stone flours, the mixture that is not more than 180 purpose mullite powder arbitrary proportions replaces.
Embodiment 12
Be with the difference of embodiment 3: be not more than 180 purpose sillimanite powder be not more than 180 purpose mullite powders, be not more than 180 purpose andaluzite powder, the mixture that is not more than 180 purpose aquamaine stone flour arbitrary proportions replaces.
Through the routine experiment, middle density high alumina brick prepared among the present invention is as shown in the table with the performance comparison of the high-density high alumina brick of commonly using:
| The performance title | The high-density high alumina brick | Middle density high alumina brick |
| Volume density (g/cm 3） | 2.5~2.8 | 1.8~2.3 |
| Compressive strength (MPa) | ≥50 | ≥40 |
| 350 ℃ of thermal conductivitys (W/m.k) | 1.6~1.8 | 0.9~1.3 |
| 1100 ℃ of water-cooleds (inferior) | ≥20 | ≥25 |
| Maximum operation (service) temperature (℃) | 1580 | 1580 |
As seen from the above table, the density high alumina brick was for high-density high alumina brick commonly used during the prepared rotary kiln of the present invention was used, have certain advantage at aspects such as density, thermal conductivity, heat-shock resistances, reached service requirements in compressive strength and maximum operation (service) temperature.
Claims (10)
1. density high alumina brick during rotary kiln is used, its component comprises particulate material, powder, aglite, wedding agent, and the weight percentage of aluminum oxide is 65 ~ 85% in this particulate material.
2. density high alumina brick during rotary kiln according to claim 1 is used is characterized in that: the density of density high alumina brick was during described rotary kiln was used: 1.8 ~ 2.3g/cm
3
Rotary kiln according to claim 2 with in the density high alumina brick, it is characterized in that: described aglite is at least a in corundum bollow ball, alumina hollow ball, aluminium titanium hollow ball, Magnalium hollow ball, hollow chrome corundum spheres, Zirconia corundum hollow sphere, mullite hollow ball, light ceramic, lightweight bauxites aggregate, the light-weight mullite aggregate.
Rotary kiln according to claim 3 with in the density high alumina brick, it is characterized in that: the granularity specification of described aglite is at least a among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
5. density high alumina brick during rotary kiln according to claim 4 is used, it is characterized in that: described particulate material comprises the alumine of 3 ~ 8mm, the alumine of 0～3mm.
Rotary kiln according to claim 5 with in the density high alumina brick, it is characterized in that: described powder includes: be not more than 180 purpose mullite powders, be not more than 180 purpose andaluzite powder, be not more than 180 purpose sillimanite powder, be not more than at least a in the 180 purpose aquamaine stone flours and be not more than 180 purpose clays and be not more than 180 purpose alumines.
Rotary kiln according to claim 6 with in the density high alumina brick, it is characterized in that: described wedding agent is a kind of in phosphoric acid solution, yellow starch gum solution, lignin sulfonic acid salts solution, the methocel solution.
8. density high alumina brick during rotary kiln according to claim 7 is used, it is characterized in that: described rotary kiln with in the component of density high alumina brick, by weight, include: 10 ~ 30 parts of aglites, 25 ~ 30 parts of the alumines of 3 ~ 8mm, 14 ~ 24 parts of the alumines of 0～3mm, be not more than 4 ~ 6 parts of 180 purpose clays, be not more than 19 ~ 27 parts of 180 purpose alumines, 5～8 parts of wedding agents and be not more than 180 purpose mullite powders, be not more than 180 purpose andaluzite powder, be not more than 180 purpose sillimanite powder, be not more than at least a 4 ~ 10 parts in the 180 purpose aquamaine stone flours.
According to claim 1 in 8 each described rotary kiln with in the preparation method of density high alumina brick, may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, add in proportion again powder stirring even;
B, moulding: the equal refining that steps A is formed adds in the mould mechanical pressing;
C, drying and burn till: the base substrate that step B is formed is after 80～150oC oven dry, and loading of kiln forms finished product in 1400～1580oC insulation, 3～8h.
10. the preparation method of density high alumina brick during rotary kiln is used according to claim 9, it is characterized in that: the breakage rate of aglite is not more than 15% in the described mechanical pressing.
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| CN103755363A (en) * | 2013-12-27 | 2014-04-30 | 郑州汇特耐火材料有限公司 | Lightweight siliceous mullite composite brick and preparation method thereof |
| CN105036713A (en) * | 2015-06-26 | 2015-11-11 | 湖南仁海科技材料发展有限公司 | Mixing technology of corundum composite ceramic material |
| CN105418098A (en) * | 2015-12-16 | 2016-03-23 | 董建军 | Heat-conductive and energy-saving refractory brick used for fire path wall in carbon roasting furnace and preparation method thereof |
| CN107663085A (en) * | 2016-07-29 | 2018-02-06 | 济源市涟源炉业有限公司 | A kind of clay insulating refractory block NG120 0.6 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103755363A (en) * | 2013-12-27 | 2014-04-30 | 郑州汇特耐火材料有限公司 | Lightweight siliceous mullite composite brick and preparation method thereof |
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| 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 |
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Application publication date: 20130424 |