CN1254456C - Light fire resisting brick of iolite-mulbite and preparation process thereby - Google Patents
Light fire resisting brick of iolite-mulbite and preparation process thereby Download PDFInfo
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- CN1254456C CN1254456C CN 200410006302 CN200410006302A CN1254456C CN 1254456 C CN1254456 C CN 1254456C CN 200410006302 CN200410006302 CN 200410006302 CN 200410006302 A CN200410006302 A CN 200410006302A CN 1254456 C CN1254456 C CN 1254456C
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Abstract
The present invention relates to a cordierite mullite light fire brick and a preparation method thereof, which belongs to the technical field of refractory materials. The present invention is characterized in that the cordierite mullite light fire brick uses 40.0 to 79.8WT% of coal gangue, 10.0 to 30.0WT% of magnesite and 10.0 to 30.0WT% of iron removal bauxite as main raw materials; 0.02 to 0.2WT% of sawdust is added in the main raw materials; water is added in the raw materials with the water to solid proportion of 0.5 to 0.6; the raw materials are added into a ball mill for mixed milling until the raw materials are finely milled to the bore diameter of 44 mu m and the screen residue of smaller than 2.0WT%; then, the raw materials are pumped into a mud filter to be filtered into mud cake; after uniformly mixed, mud cake and organic matter chips such as sawdust, etc. are extruded for forming by a pug extruder or are manually rammed or cast for forming; after dried, raw blanks are calcined under the temperature of 1200 to 1400 DEG C and have solid phase reaction and liquid phase reaction to generate cordierite and mullite; after brick blanks carry out cut milling, the light fire brick with the main crystal phase of the cordierite and the mullite is obtained. The present invention uses the coal gangue as the main raw materials, the solid waste is utilized, combustible substance in the coal gangue is utilized, energy is saved in the calcination process, simultaneously, the reducing atmosphere in the brick blanks can be easily maintained, and the product property can be optimized.
Description
Technical field
The invention belongs to fire resisting material field, particularly a kind of dichroite-mullite light fire brick.
Background technology
Trichroite is the minimum mineral of thermal expansivity in all known silicate mineralss, thereby is that the goods of principal crystalline phase all have the performance of good anti-rapid heat cycle with the trichroite.Light fire brick is used for the refractory lining of periodic kilns the kiln more, mainly is subjected to the influence of material heat impact strength the work-ing life of these light fire bricks.Therefore the periodic kilns the kiln that the dichroite-mullite light fire brick that has a relatively low thermel expansion coefficient is used for frequent intensification, cooling will make furnace lining that arranged long work-ing life, and the existence of mullite and a small amount of spinel simultaneously makes this light fire brick have higher use temperature.
The content of institute's producing coal spoil iron is very low in some layer position, China some areas (as Datong, Yangquan), can reach below the 2.0Wt.%.These coal gangues mainly are made up of kaolinite and ature of coal, therefore are called coal series kaolin rock again.The desirable chemical constitution of trichroite is 2MgO2Al
2O
35SiO
4, and kaolinic desirable chemical ingredients is Al
2O
32SiO
22H
2O, therefore by toward coal gangue in, introducing MgO, pass through again incinerating pyroreaction and crystallization control process just can synthesis of dichroite and mullite be the goods of main crystalline phase.
Patent " production method of trichroite aglite brick " (application number: 95110523X; Publication number: CN1121493A) having introduced with talcum powder, alumina, flint clay, clay and aluminum oxide powder etc. is that main raw material prepares aglite through foaming, moulding, oven dry, be that main raw material is made binding agent with talcum powder, red clay, smolmitza, aluminum oxide powder etc. again, aglite is bonded to the preparation method who is sintered into the trichroite light fire brick of brick after the adobe again, but not mentioning with coal gangue (or coal series kaolin rock) is main raw material and through once shaped, oven dry, the technology of dichroite-mullite light fire brick is made in calcining.
Summary of the invention
The object of the invention is to use coal gangue as main material production dichroite-mullite light fire brick, except making solid waste obtains utilizing, reduces production costs, also utilize the coal part in the coal gangue in calcination process, can generate heat, thereby save the energy and keep certain reducing atmosphere.
A kind of dichroite-mullite light fire brick, it is characterized in that the dichroite-mullite light fire brick is with coal gangue 70.0～89.8Wt.%, magnesia 10.0～30.0Wt.% is a main raw material, adds 0.02～0.2Wt.% sawdust (or porous plastics bead, chip or other organic debris).
Regulate the composition of goods, make it contain more mullite, also can add a certain amount of red bauxite that removes.
Material composition is coal gangue 40.0～79.8Wt.%; Magnesia 10.0～30.0Wt.%; Remove red bauxite 10.0～30.0Wt.%; Add 0.02～0.2Wt.% sawdust (or porous plastics bead, chip or other organic debris).
The present invention to the composition requirement of coal gangue is: Al
2O
334～37Wt.%; SiO
245～47Wt.%; MgO0.01～10.0Wt.%; CaO 0.01～0.5Wt.%; FeS
20.01～3.0Wt.%; TiO
20.01～1.0Wt.%; K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.%; Burn to lose 10.0～20.0Wt.%, the coal gangue that will meet above-mentioned composition is crushed to the size less than ball mills 1/6.Composition requirement to magnesia is: MgO80.0～95.0Wt.%; CaO 0.01～3.0Wt.%; Al
2O
30.01～5.0Wt.%; Si0
20.01～5.0Wt.%; Fe
2O
30.01～2.0Wt.%; K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.%; The magnesia raw material should be powdery, does not have the lump greater than 10cm.To the composition requirement that removes red bauxite be: Al
2O
360.0～80.0Wt.%; SiO
210.0～20.0Wt.%; MgO 0.01～5.0Wt.%; CaO 0.01～1.0Wt.%; FeS
20.01～1.0Wt.%; TiO
20.1～2.0Wt.%; K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.% burns and loses 10.0～16.0Wt.%, and the deironing alumina raw should be powdery, does not have the lump greater than 2mm.Sawdust (or porous plastics bead, chip or other organic debris) answers 100% can be the screen cloth of 2mm by the aperture.
The present invention adopts low iron coal gangues (Coaseries kaolin) that was produced from ground such as Datong, Yangquan and magnesia (major ingredient is MgO) ball mill wet method mix grinding, and then adding sawdust (or other organic debris) is made mixed soil cream (or mud).Mixed soil cream is extruded with forcing machine, or mud is poured into mould, rely on
Hydration reaction to produce sclerosis fixed, coal gangue also has certain adhesive property after wet method is levigate.Green compact are dry after 1200～1400 ℃ of calcinings can generate trichroite and mullite by solid state reaction and liquid phase reaction.It is the light fire brick of main crystalline phase that adobe can obtain with trichroite and mullite after cutting mill.Except principal crystalline phase trichroite and mullite, also can generate a small amount of spinel (Al in the finished bricks
2O
3MgO), the small amounts of iron impurity in the coal gangue can the big portion of isomorphous form enter the lattice of trichroite and spinel, thereby makes goods keep preferable performance.
The preparation technology of dichroite-mullite light fire brick is
Gu the coal gangue that will dispose according to the above ratio, magnesia, remove red bauxite and add water in the ratio of water /=0.5～0.6 and go into ball mill mix grinding together, be milled down to 44 μ m aperture sieve screen over-sizes jointly less than 2.0Wt.%; Squeeze into the filter mud machine filter again after mud taken out and become mud cake from ball mill, the water ratio of mud cake should be controlled between 20.0～30.0Wt.%.
2. the organic debris that adds 0.02～0.2Wt.% is mixed together mud cake and organic debris, uses mud extruder extrusion moulding or manual ramming or casting after mixing again.
3. the wet base after the moulding leaves standstill maintenance in room temperature and enters baking operation after 24 hours, the oven dry of wet base evenly rises to 110 ℃ from room temperature, the whole heating-up time is 4～8 hours, naturally be cooled to below 80 ℃ after being incubated 12 hours again and take out from drying plant, the dry body water ratio of taking-up is controlled at below the 3.0Wt.%.
4. the base substrate that drying is good is put into the calcining of high temperature kiln, keep weakly reducing atmosphere in the inherent calcination process of calcining kiln, rising to 200 ℃ from room temperature in the calcination process was controlled at 8～10 hours, rising to 1100 ℃ of heating-up times from 200 ℃ was controlled at 6～8 hours, be controlled at 5～7 hours from 1100 ℃ of times to 1350～1400 ℃ of maximum sintering temperatures, maximum sintering temperature insulation 6～10 hours, cool to 1100 ℃ with 1～2 hour average rate then, be incubated 6～8 hours again.The main purpose of this insulating process is will make part in the adobe melt body to be transformed into cordierite crystal again, to improve the performance of goods.In this nature cooling of can ceasing fire below temperature, also can squeeze into the cold wind fast cooling, to enhance productivity.Behind the adobe kiln discharge according to requirement of client with company standard is cut and precision sizing, through selling as finished product after the assay was approved.
Dichroite-mullite light fire brick involved in the present invention is mainly used to replace traditional lightweight refractory fireclay block and light weeight alumina brick refractory brick, utilizes its good resistance to thermal shocks to prolong the work-ing life of furnace lining.
The present invention uses coal gangue as main raw material, has not only utilized solid waste, can also utilize combustiblematerials contained in the coal gangue, saves the energy in sintering process, is easy to maintain the reducing atmosphere in the adobe simultaneously, makes the irony major part in the adobe remain on Fe
2+The reduction valence state so that enter trichroite and spinel lattice, help optimizing product properties with isomorph.
With patent " production method of trichroite aglite brick " (application number: 95110523X; Publication number: production technique CN1121493A) is compared, and the present invention also is reduced to single stage method brickmaking from two-step approach brickmaking except using low-cost raw material, saves processing charges, therefore manufacturing cost is descended significantly.
The performance of the typical species of product of the present invention and light weight fireclay brick and light weeight alumina brick is more as shown in table 1.
Table 1 dichroite-mullite light fire brick and light weight fireclay brick, light weeight alumina brick typical case performance are relatively
| Performance | The dichroite-mullite light fire brick | Light weight fireclay brick | Light weeight alumina brick | Examination criteria |
| Volume density (g/cm 3) compression strength (MPa) rupture strength (MPa) maximum operation (service) temperature ℃) thermal conductivity factor (W/mK) (25 ℃) thermal conductivity factors (W/mK) (800 ℃) thermal shock resistances (inferior) | 0.9 3.5 1.35 1350 0.195 0.320 57 | 0.9 2.5 1.24 1300 0.28 0.47 26 | 0.9 3.5 1.30 1400 2.72 0.44 28 | GB2998-82 GB3997.2-83 GB3001-82 GB3995-83 GB5990-86 GB5990-86 YB376-75 |
As can be seen from Table 1, the use temperature of lightweight cordierite refractory brick is between light weight fireclay brick and light weeight alumina brick, but thermal conductivity has reduction significantly, and the thermal shock resistance number of times is more than doubled.
Embodiment
Embodiment 1
Coal gangue is taken from the Datong, and its chemical ingredients is: Al
2O
336.12Wt.%; SiO
245.2Wt.%; MgO 0.3Wt.%; CaO 0.2Wt.%; FeS
21.8Wt.%; TiO
20.8Wt.%; K
2O 0.1Wt.%; Na
2O 0.08Wt.%; Burn and lose 15.4Wt.%.The Chemical Composition of magnesia is: MgO 95.2Wt.%; CaO1.5Wt.%; Al
2O
30.2Wt.%; SiO
21.2Wt.%; Fe
2O
31.4Wt.%; K
2O 0.3Wt.%; Na
2O0.2Wt.%; Present embodiment does not use except that red bauxite.The cooperation ratio of two kinds of raw materials when the preparation pug: coal gangue 85Wt.%; Magnesia 15.0Wt.% goes into ball mill mix grinding together Gu add water in the ratio of water /=0.5～0.6, is milled down to 44 μ m aperture sieve (325 order) screen over-sizes jointly less than 2.0Wt.%.Squeeze into the filter mud machine filter again after mud taken out and become mud cake from ball mill, the water ratio of mud cake should be controlled between 20.0～30.0Wt.%.Then organic chips such as mud cake and sawdust are mixed together.The add-on of sawdust and inorganic powder weight ratio are controlled at 0.12, use mud extruder extrusion moulding or manual ramming or cast (when water content is big) moulding after mixing again.Wet base after the moulding needs room temperature to leave standstill maintenance and enters baking operation after 24 hours.The oven dry of wet base evenly rises to 110 ℃ gradually from room temperature.6 hours whole heating-up times, be cooled to naturally below 80 ℃ after being incubated 12 hours again and from drying plant, take out.The dry body water ratio that takes out is controlled at below the 3.0Wt.%.The base substrate that drying is good is put into the calcining of high temperature kiln, keeps weakly reducing atmosphere in the inherent calcination process of calcining kiln.Rise to 200 ℃ from room temperature in the calcination process and be controlled at 9 hours, rise to 1100 ℃ of heat-up rates from 200 ℃ and be controlled at 7 hours, maximum sintering temperature was controlled at 6 hours from 1100 ℃ to 1350 ℃.This temperature range insulation 8 hours, cool to 1100 ℃ with 1 hour average rate then, be incubated 7 hours again.The resulting product performance sees Table 2.
The physicals of dichroite-mullite light fire brick among table 2 embodiment 1
| Ultimate compression strength (MPa) | Folding strength (MPa) | Volume density (g/cm 3) | Maximum operation (service) temperature (℃) | Thermal shock resistance (inferior) | Thermal conductivity (W/mK) | |
| 25℃ | 800℃ | |||||
| 3.8 | 1.5 | 0.9 | 1350 | 64 | 0.184 | 0.312 |
Embodiment 2
Coal gangue is taken from the Datong, and its chemical ingredients is: Al
2O
336.12Wt.%; SiO
245.2Wt.%; MgO 0.3Wt.%; CaO 0.2Wt.%; FeS
21.8Wt.%; TiO
20.8Wt.%; K
2O 0.1Wt.%; Na
2O 0.08Wt.%; Burn and lose 15.4Wt.%.The Chemical Composition of magnesia is: MgO 95.2Wt.%; CaO1.5Wt.%; Al
2O
30.2Wt.%; SiO
21.2Wt.%; Fe
2O
31.4Wt.%; K
2O 0.3Wt.%; Na
2O0.2Wt.%; The employed chemical ingredients of removing bauxite is: Al
2O
368.2Wt.%; SiO
214.8Wt.%; MgO 0.2Wt.%; CaO 0.05Wt.%; FeS
20.6Wt.%; TiO
20.7Wt.%; K
2O 0.05Wt.%; Na
2O 0.02Wt.%; Burn and lose 15.38Wt.%.The cooperation ratio of three kinds of raw materials is during the preparation pug: coal gangue 65.88Wt.%; Magnesia 15.0Wt.%; Remove red bauxite 20.0Wt.%; Go into ball mill mix grinding together Gu add water, be milled down to 44 μ m aperture sieve (325 order) screen over-sizes jointly less than 2.0Wt.% in the ratio of water /=0.5～0.6.Squeeze into the filter mud machine filter again after mud taken out and become mud cake from ball mill, the water ratio of mud cake should be controlled between 20.0～30.0Wt.%.Then organic chips such as mud cake and sawdust are mixed together.The add-on of sawdust and inorganic powder weight ratio are controlled at 0.12, use mud extruder extrusion moulding or manual ramming or cast (when water content is big) moulding after mixing again.Wet base after the moulding needs room temperature to leave standstill maintenance and enters baking operation after 24 hours.The oven dry of wet base evenly rises to 110 ℃ gradually from room temperature.6 hours whole heating-up times, be cooled to naturally below 80 ℃ after being incubated 12 hours again and from drying plant, take out.The dry body water ratio that takes out is controlled at below the 3.0Wt.%.The base substrate that drying is good is put into the calcining of high temperature kiln, keeps weakly reducing atmosphere in the inherent calcination process of calcining kiln.Rise to 200 ℃ from room temperature in the calcination process and will be controlled at 9 hours, rising to 1100 ℃ of heat-up rates from 200 ℃ should be built in 7 hour, and maximum sintering temperature was controlled at 6 hours from 1100 ℃ to 1400 ℃.This temperature range insulation 8 hours, cool to 1100 ℃ with 1 hour average rate then, be incubated 7 hours again.The resulting product performance sees Table 3.
The physicals of dichroite-mullite light fire brick among table 3 embodiment 2
| Ultimate compression strength (MPa) | Folding strength (MPa) | Volume density (g/cm 3) | Maximum operation (service) temperature (℃) | Thermal shock resistance (inferior) | Thermal conductivity (W/mK) | |
| 25℃ | 800℃ | |||||
| 4.0 | 1.7 | 0.9 | 1400 | 51 | 0.221 | 0.367 |
Claims (8)
1. dichroite-mullite light fire brick, it is characterized in that: the dichroite-mullite light fire brick is with coal gangue 70.0～89.8Wt.%, and magnesia 10.0～30.0Wt.% is a raw material, adds the organic debris of 0.02～0.2Wt.%; Composition requirement to coal gangue is: Al
2O
334～37Wt.%; SiO
245～47Wt.%; MgO 0.01～10.0Wt.%; CaO 0.01～0.5Wt.%; FeS
20.01～3.0Wt.%:TiO
20.01～1.0Wt.%; K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.%; Loss on ignition 10.0～20.0Wt.%, coal gangue are crushed to the size less than ball mills 1/6; Composition requirement to magnesia is: MgO80.0～95.0Wt.%; CaO 0.01～3.0Wt.%; Al
2O
30.01～5.0Wt.%; SiO
20.01～5.0Wt.%; Fe
2O
30.01～2.0Wt.%; K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.%; The magnesia raw material is a powdery, does not have the lump greater than 10cm.
2. a kind of dichroite-mullite light fire brick as claimed in claim 1 is characterized in that: described organic debris refers to sawdust or porous plastics bead, and sawdust 100% is the screen cloth of 2mm by the aperture.
3. the preparation method of a kind of dichroite-mullite light fire brick as claimed in claim 1 is characterized in that:
Go into ball mill mix grinding together Gu a. coal gangue+magnesia is added water by weight the ratio of water /=0.5～0.6, be milled down to 44 μ m aperture sieve screen over-sizes jointly less than 2.0Wt.%; Squeeze into the filter mud machine filter again after mud taken out and become mud cake from ball mill, the water ratio of mud cake is controlled between 20.0～30.0Wt.%;
B. the organic debris that adds 0.02～0.2Wt.% is mixed together mud cake and organic debris, uses mud extruder extrusion moulding or manual ramming or casting after mixing again;
C. the wet base after the moulding leaves standstill maintenance in room temperature and enters baking operation after 24 hours, the oven dry of wet base evenly rises to 110 ℃ from room temperature, the whole heating-up time is 4～8 hours, naturally be cooled to below 80 ℃ after being incubated 12 hours again and take out from drying plant, the dry body water ratio of taking-up is controlled at below the 3.0Wt.%;
D. drying is good base substrate is put into the calcining of high temperature kiln, keep weakly reducing atmosphere in the inherent calcination process of calcining kiln, rising to 200 ℃ from room temperature in the calcination process was controlled at 8～10 hours, rising to 1100 ℃ of heating-up times from 200 ℃ was controlled at 6～8 hours, be controlled at 5～7 hours from 1100 ℃ of times to 1350～1400 ℃ of maximum sintering temperatures, maximum sintering temperature insulation 6～10 hours, cool to 1100 ℃ with 1～2 hour average rate then, be incubated 6～8 hours again.
4. the preparation method of a kind of dichroite-mullite light fire brick as claimed in claim 3 is characterized in that: organic debris described in the b refers to sawdust or porous plastics bead, and sawdust 100% is the screen cloth of 2mm by the aperture.
5. dichroite-mullite light fire brick is characterized in that: added in the raw material and removed red bauxite, material composition is coal gangue 40.0～79.8Wt.%; Magnesia 10.0～30.0Wt.%; Remove red bauxite 10.0～30.0Wt.%; Add 0.02～0.2Wt.% organic debris, the composition that removes red bauxite is required be: Al
2O
360.0～80.0Wt.%; SiO
210.0～20.0Wt.%; MgO 0.01～5.0Wt.%; CaO 0.01～1.0Wt.%; FeS
20.01～1.0Wt.%; TiO
20.1～2.0Wt.%; K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.% burns and loses 10.0～16.0Wt.%, and the deironing alumina raw is a powdery, does not have the lump greater than 2mm; Composition requirement to coal gangue is: Al
2O
334～37Wt.%; SiO
245～47Wt.%; MgO 0.01～10.0Wt.%; CaO0.01～0.5Wt.%; FeS
20.01～3.0Wt.%; TiO
20.01～1.0Wt.%:K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.%; Loss on ignition 10.0～20.0Wt.%, coal gangue are crushed to the size less than ball mills 1/6; Composition requirement to magnesia is: MgO 80.0～95.0Wt.%; CaO 0.01～3.0Wt.%; Al
2O
30.01～5.0Wt.%; SiO
20.01～5.0Wt.%; Fe
2O
30.01～2.0Wt.%; K
2O 0.01～1.0Wt.%; Na
2O 0.01～1.0Wt.%; The magnesia raw material is a powdery, does not have the lump greater than 10cm.
6. a kind of dichroite-mullite light fire brick as claimed in claim 5 is characterized in that: described organic debris refers to sawdust or porous plastics bead, and sawdust 100% is the screen cloth of 2mm by the aperture.
7. the preparation method of a kind of dichroite-mullite light fire brick as claimed in claim 5 is characterized in that:
Gu, be milled down to 44 μ m aperture sieve screen over-sizes jointly less than 2.0Wt.% a. with coal gangue and magnesia with remove red bauxite and add water by weight the ratio of water /=0.5～0.6 and go into ball mill mix grinding together; Squeeze into the filter mud machine filter again after mud taken out and become mud cake from ball mill, the water ratio of mud cake is controlled between 20.0～30.0Wt.%;
B. the organic debris that adds 0.02～0.2Wt.% is mixed together mud cake and organic debris, uses mud extruder extrusion moulding or manual ramming or casting after mixing again;
C. the wet base after the moulding leaves standstill maintenance in room temperature and enters baking operation after 24 hours, the oven dry of wet base evenly rises to 110 ℃ from room temperature, the whole heating-up time is 4～8 hours, naturally be cooled to below 80 ℃ after being incubated 12 hours again and take out from drying plant, the dry body water ratio of taking-up is controlled at below the 3.0Wt.%;
D. drying is good base substrate is put into the calcining of high temperature kiln, keep weakly reducing atmosphere in the inherent calcination process of calcining kiln, rising to 200 ℃ from room temperature in the calcination process was controlled at 8～10 hours, rising to 1100 ℃ of heating-up times from 200 ℃ was controlled at 6～8 hours, be controlled at 5～7 hours from 1100 ℃ of times to 1350～1400 ℃ of maximum sintering temperatures, maximum sintering temperature insulation 6～10 hours, cool to 1100 ℃ with 1～2 hour average rate then, be incubated 6～8 hours again.
8. the preparation method of a kind of dichroite-mullite light fire brick as claimed in claim 7 is characterized in that: organic debris described in the b refers to sawdust or porous plastics bead, and sawdust 100% is the screen cloth of 2mm by the aperture.
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|---|---|---|---|
| CN 200410006302 CN1254456C (en) | 2004-02-24 | 2004-02-24 | Light fire resisting brick of iolite-mulbite and preparation process thereby |
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|---|---|---|---|
| CN 200410006302 CN1254456C (en) | 2004-02-24 | 2004-02-24 | Light fire resisting brick of iolite-mulbite and preparation process thereby |
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| CN1254456C true CN1254456C (en) | 2006-05-03 |
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| CN108002845A (en) * | 2017-10-30 | 2018-05-08 | 林龙 | A kind of preparation method of light thermal-insulation fired brick |
| CN108557779A (en) * | 2018-07-03 | 2018-09-21 | 贵州大学 | A kind of method of ardealite and flyash relieving haperacidity coproduction mullite firebrick |
| CN114195544A (en) * | 2021-12-10 | 2022-03-18 | 江西英矿新型墙体材料有限公司 | Method for preparing perforated brick by recycling coal gangue |
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2004
- 2004-02-24 CN CN 200410006302 patent/CN1254456C/en not_active Expired - Fee Related
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