CN102815962A - Manufacturing method of low-heat-conducting light refractory brick for thermal-insulating layer of industrial kiln - Google Patents
Manufacturing method of low-heat-conducting light refractory brick for thermal-insulating layer of industrial kiln Download PDFInfo
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- CN102815962A CN102815962A CN2012103105415A CN201210310541A CN102815962A CN 102815962 A CN102815962 A CN 102815962A CN 2012103105415 A CN2012103105415 A CN 2012103105415A CN 201210310541 A CN201210310541 A CN 201210310541A CN 102815962 A CN102815962 A CN 102815962A
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Abstract
The invention discloses a manufacturing method of a low-heat-conducting light refractory brick for a thermal-insulating layer of an industrial kiln. The manufacturing method includes the steps: grinding the components, by weight, 10-15% of industrial alumina, 10-15% of flint clay clinker, 4-7% of Suzhou clay, 4-7% of feldspar, 3-5% of steatite, 3-5% of alum and the balance bauxite into slurry by adding water; dissolving rosin soap into bone glue liquor so as to form concentrated foaming agents; and adding water into the concentrated foaming agents, mixing the concentrated foaming agents with the slurry for foaming so that foamed slurry is obtained, injecting the obtained foamed slurry into a mould for drying, and placing the dried molded foamed slurry into the kiln for firing. By the manufacturing method, the foaming agents are added into slurry raw materials, and the proportion of the slurry can be adjusted by adjusting the adding proportion of the foaming agents; and the alum added into the slurry is used for stabilizing foam pores, so that foam pores formed in the brick are uniform, and the fired refractory brick is uniform in material volume density.
Description
Technical field
The present invention relates to a kind of method of manufacture of light fire brick, particularly relate to a kind of method of manufacture that is used for the low heat conductivity light fire brick of Industrial Stoves thermofin.
Background technology
Refractory brick is mainly used in the thermofin of Industrial Stoves, and the material that thermofin generally adopts is refractory brick and aluminum silicate fiber (cotton, felt, plate), and as only using aluminum silicate fiber, its compressive strength is low, anti-flame, sweep of gases ability; As only use refractory brick, then body of heater weight increases, the bearing requirements aggravation.Therefore according to the equipment working condition condition, difference mixes uses two kinds of materials, but since these two kinds of materials under the condition of high temperature; Their thermal expansivity is different, and in the kiln shutdown process, ratio of shrinkage swelling is different between multiple unlike material; And cause thermofin to be peeled off easily, influence overall performance.Existing refractory brick with pore, it is little that it has density, the characteristic that thermal conductivity is low.Mainly control its density in the production process of refractory brick at present through the amount of control weighting material.Existing weighting material is generally materials such as stone tar, expandable polystyrene particle or wood chip, and these weighting materials stay hole in refractory brick after the oxidation in the high-temperature firing process, and refractory materials is fired how much being directly proportional of back density and weighting material.But because the density of these weighting materials is usually less than the material density of producing high-temperature refractory, therefore in the whipping process of raw material, weighting material is suspended on the refractory raw material; Be difficult to be uniformly distributed in material internal; Cause the refractory brick density unevenness even, as adopting expandable polystyrene particle, particle size difference causes burning till back refractory brick internal pore pore size equally and differs; The anti-material volume density of different batches is different, influences the refractory brick heat-proof quality.
Summary of the invention
The object of the present invention is to provide a kind of method of manufacture of low heat conductivity light fire brick of Industrial Stoves thermofin, burn till back refractory brick internal density skewness, the big problem of each batch refractory brick volume density difference with solution.
For solving the problems of the technologies described above, technical scheme of the present invention is such, and a kind of method of manufacture of Industrial Stoves thermofin low heat conduction light refractory brick is characterized in that comprising following steps:
(1) preparation mud; The mud raw material is become mud with the water mixed grinding; The weight of said water accounts for mud weight 48～55%; Said mud raw material comprises following weight ratio ingredient: commercial alumina 10～15%, flint clay grog 10～15%, Suzhou soil 4～7%, feldspar 4～7%, talcum 3～5%, alum 3～5%, and all the other are bauxitic clay; Median size＜the 0.08mm of said mud particle;
(2) preparation concentrated foam agent mixed with gelatine water and is heated into gelatine liquid by weight 1: 0.25～1: 0.35, by weight 1: 0.15～1: 0.2 Hybrid Heating, rosined soap dissolved one-tenth concentrated foam agent afterwards with gelatine liquid and rosined soap;
(3) prepare foam mud, concentrated foam agent and water that step (2) is obtained mixed stirring formation foaming agent in the adding whisking machine by weight 1: 8～1: 9, be mixed into foam mud with mud then;
(4) shaping and drying in the foam mud injection moulding mould with step (3) acquisition, places under 15～35 ℃ of environment and is dried to blank, dry back blank water cut＜4%;
(5) burn till, blank is piled up in kiln, afterwards adopted oxidizing atmosphere to burn till 1300～1400 ℃ of firing temperatures, firing time 144～168 hours.
Preferably, the mud raw material comprises following weight ratio ingredient in the said step (1): commercial alumina 12%, flint clay grog 15%, Suzhou soil 5%, feldspar 5%, talcum 3%, alum 3.5%, all the other are bauxitic clay.
More even in order to obtain that foam mud is mixed; Preferably, foaming agent churning time in whisking machine is 12～18 minutes in the said step (3), and mixing speed is 180～200 rev/mins; Foaming agent mixed churning time 15～18 minutes with mud, mixing speed is 250～300 rev/mins.Control churning time and mixing speed when foaming agent stirs and mix stirring; Cross low mixing speed and too short churning time and can't make mud and foam thorough mixing; Influence the density distribution homogeneity of final refractory materials, stirring exceedingly then causes foam unstable easily, makes foam destroyed; Hole be can't form after material burns till, material monolithic density and heat conductivility influenced.
In order to guarantee sintering finished rate and end properties, in said step (5) sintering process, it is 115～120 hours that the interior temperature of kiln rises to 1000 ℃ of required heat-up times by normal temperature.
The advantage of technical scheme provided by the present invention is; In the mud raw material, select alum for use; The additional proportion of adjustment control alum can be regulated MW, reduces the specific gravity difference between foaming agent and the mud, simultaneously since alum have very strong water absorbing properties can stable foam; Under the stirring of power of enforcement, mud is being held up in the foamy surface be unlikely to destroy foam itself.The mixing solutions that adopts rosined soap and gelatine in addition is as foaming agent, and the protein molecule in the gelatine is absorbed in the rosin soda soap and has improved intermolecular interaction, has strengthened surface film intensity, strengthens foaming agent viscosity, has strengthened froth stability.Refractory brick material internal hole high conformity after burning till is evenly distributed, i.e. refractory brick overall volume density uniformity.
Embodiment
Below in conjunction with embodiment the present invention is described further, but not as to qualification of the present invention.
Embodiment 1:
(1) preparation mud; With mud primary industry aluminum oxide 10%, flint clay grog 14%, Suzhou soil 4%, feldspar 4%, talcum 4%, alum 3%; All the other add the interior grinding of ball mill and add entry for bauxitic clay; Infusion is ground after 16 hours and was obtained mud in 16 hours, and the mud weight in wet base is than 48%, the median size＜0.08mm of said mud particle;
(2) preparation concentrated foam agent mixed with gelatine water and is heated into gelatine liquid by weight 1: 0.25, by weight 1: 0.15 Hybrid Heating, rosined soap dissolved one-tenth concentrated foam agent afterwards with gelatine liquid and rosined soap;
(3) preparation foam mud, the concentrated foam agent that step (2) is obtained mixes in the adding whisking machine by weight 1: 9 with water, stirs 12 minutes; Mixing speed is 190 rev/mins and forms foaming agent; Then foaming agent is poured in the slush-pit launder and mixed with mud, continue to stir 15 minutes, mixing speed is 250 rev/mins and becomes foam mud; Make mud be adsorbed on the foam pore around, form closed pore;
(4) shaping and drying, the foam mud that step (3) is obtained injects in the forming moulds such as wooden model or porous aluminum dipping form, for the convenient demoulding; Minimizing is peeled off, and lays 2,3 layers of paper in the forming mould in advance, and foam mud slowly injects in the mould; Insert the mould corner gently with wood chip simultaneously, exhausted air makes foam mud closely knit; Also can vibrate a little; Make the foam mud homogeneous microstructure reduce cracking phenomena, be placed on outdoor then or in the low temperature drying room, keep 15 ℃ and be dried to blank, dry back blank water cut＜4%;
(5) burn till, with blank with the side coding mode at interval 5～10mm prevent that in the kiln of falling the cigarette employing oxidizing atmosphere is burnt till, 1400 ℃ of firing temperatures, firing time 144 hours, kiln temperature is risen to by normal temperature and heat-up time of 1000 ℃ is controlled to be 115 hours in the sintering process.
Finished product refractory brick density of material 0.34g/cm
3, thermal conductivity 0.28w/m.k, 1300 ℃ of permanent lines change 0.89%.
Embodiment 2:
(1) preparation mud; With mud primary industry aluminum oxide 12%, flint clay grog 13%, Suzhou soil 5%, feldspar 5%, talcum 3%, alum 3.5%; All the other add the interior grinding of ball mill and add entry for bauxitic clay; Infusion is ground after 18 hours and was obtained mud in 20 hours, and the mud weight in wet base is than 50%, the median size＜0.07mm of said mud particle;
(2) preparation concentrated foam agent mixed with gelatine water and is heated into gelatine liquid by weight 1: 0.3, by weight 1: 0.18 Hybrid Heating, rosined soap dissolved one-tenth concentrated foam agent afterwards with gelatine liquid and rosined soap;
(3) preparation foam mud, the concentrated foam agent that step (2) is obtained mixes in the adding whisking machine by weight 1: 8 with water, stirs 15 minutes; Mixing speed is 180 rev/mins and forms foaming agent; Then foaming agent is poured in the slush-pit launder and mixed with mud, continue to stir 18 minutes, mixing speed is 300 rev/mins and becomes foam mud; Make mud be adsorbed on the foam pore around, form closed pore;
(4) shaping and drying, the foam mud that step (3) is obtained injects in the forming moulds such as wooden model or porous aluminum dipping form, for the convenient demoulding; Minimizing is peeled off, and lays 2,3 layers of paper in the forming mould in advance, and foam mud slowly injects in the mould; Insert the mould corner gently with wood chip simultaneously, exhausted air makes foam mud closely knit; Also can vibrate a little; Make the foam mud homogeneous microstructure reduce cracking phenomena, be placed on outdoor then or in the low temperature drying room, keep 25 ℃ and be dried to blank, dry back blank water cut＜3.6%;
(5) burn till, with blank with the side coding mode at interval 5～10mm prevent that in the kiln of falling the cigarette employing oxidizing atmosphere is burnt till, 1350 ℃ of firing temperatures, firing time 168 hours, kiln temperature is risen to by normal temperature and heat-up time of 1000 ℃ is controlled to be 120 hours in the sintering process.
Finished product refractory brick density of material 0.36g/cm
3, thermal conductivity 0.25w/m.k, 1300 ℃ of permanent lines change 0.75%.
Embodiment 3:
(1) preparation mud; With mud primary industry aluminum oxide 13%, flint clay grog 10%, Suzhou soil 7%, feldspar 5%, talcum 5%, alum 5%; All the other add the interior grinding of ball mill and add entry for bauxitic clay; Infusion is ground after 22 hours and was obtained mud in 20 hours, and the mud weight in wet base is than 55%, the median size＜0.07mm of said mud particle;
(2) preparation concentrated foam agent mixed with gelatine water and is heated into gelatine liquid by weight 1: 0.32, by weight 1: 0.2 Hybrid Heating, rosined soap dissolved one-tenth concentrated foam agent afterwards with gelatine liquid and rosined soap;
(3) preparation foam mud, the concentrated foam agent that step (2) is obtained mixes in the adding whisking machine by weight 1: 88 with water, stirs 15 minutes; Mixing speed is 200 rev/mins and forms foaming agent; Then foaming agent is poured in the slush-pit launder and mixed with mud, continue to stir 16 minutes, mixing speed is 280 rev/mins and becomes foam mud; Make mud be adsorbed on the foam pore around, form closed pore;
(4) shaping and drying, the foam mud that step (3) is obtained injects in the forming moulds such as wooden model or porous aluminum dipping form, for the convenient demoulding; Minimizing is peeled off, and lays 2,3 layers of paper in the forming mould in advance, and foam mud slowly injects in the mould; Insert the mould corner gently with wood chip simultaneously, exhausted air makes foam mud closely knit; Also can vibrate a little; Make the foam mud homogeneous microstructure reduce cracking phenomena, be placed on outdoor then or in the low temperature drying room, keep 35 ℃ and be dried to blank, dry back blank water cut＜3.2%;
(5) burn till, with blank with the side coding mode at interval 5～10mm prevent that in the kiln of falling the cigarette employing oxidizing atmosphere is burnt till, 1300 ℃ of firing temperatures, firing time 156 hours, kiln temperature is risen to by normal temperature and heat-up time of 1000 ℃ is controlled to be 115 hours in the sintering process.
Finished product refractory brick density of material 0.42g/cm
3, thermal conductivity 0.30w/m.k, 1300 ℃ of permanent lines change 0.96%.
Embodiment 4:
(1) preparation mud; With mud primary industry aluminum oxide 15%, flint clay grog 15%, Suzhou soil 7%, feldspar 7%, talcum 3%, alum 4%; All the other add the interior grinding of ball mill and add entry for bauxitic clay; Infusion is ground after 24 hours and was obtained mud in 24 hours, and the mud weight in wet base is than 52%, the median size＜0.06mm of said mud particle;
(2) preparation concentrated foam agent mixed with gelatine water and is heated into gelatine liquid by weight 1: 0.35, by weight 1: 0.2 Hybrid Heating, rosined soap dissolved one-tenth concentrated foam agent afterwards with gelatine liquid and rosined soap;
(3) preparation foam mud, the concentrated foam agent that step (2) is obtained mixes in the adding whisking machine by weight 1: 85 with water, stirs 18 minutes; Mixing speed is 200 rev/mins and forms foaming agent; Then foaming agent is poured in the slush-pit launder and mixed with mud, continue to stir 18 minutes, mixing speed is 260 rev/mins and becomes foam mud; Make mud be adsorbed on the foam pore around, form closed pore;
(4) shaping and drying, the foam mud that step (3) is obtained injects in the forming moulds such as wooden model or porous aluminum dipping form, for the convenient demoulding; Minimizing is peeled off, and lays 2,3 layers of paper in the forming mould in advance, and foam mud slowly injects in the mould; Insert the mould corner gently with wood chip simultaneously, exhausted air makes foam mud closely knit; Also can vibrate a little; Make the foam mud homogeneous microstructure reduce cracking phenomena, be placed on outdoor then or in the low temperature drying room, keep 30 ℃ and be dried to blank, dry back blank water cut＜3.5%;
(5) burn till, with blank with the side coding mode at interval 5～10mm prevent that in the kiln of falling the cigarette employing oxidizing atmosphere is burnt till, 1350 ℃ of firing temperatures, firing time 156 hours, kiln temperature is risen to by normal temperature and heat-up time of 1000 ℃ is controlled to be 118 hours in the sintering process.
Finished product refractory brick density of material 0.44g/cm
3, thermal conductivity 0.29w/m.k, 1300 ℃ of permanent lines change 0.92%.
Claims (4)
1. the method for manufacture of an Industrial Stoves thermofin low heat conduction light refractory brick is characterized in that comprising following steps:
(1) preparation mud; The mud raw material is become mud with the water mixed grinding; The weight of said water accounts for mud weight 48～55%; Said mud raw material comprises following weight ratio ingredient: commercial alumina 10～15%, flint clay grog 10～15%, Suzhou soil 4～7%, feldspar 4～7%, talcum 3～5%, alum 3～5%, and all the other are bauxitic clay; Median size＜the 0.08mm of said mud particle;
(2) preparation concentrated foam agent mixed with gelatine water and is heated into gelatine liquid by weight 1: 0.25～1: 0.35, by weight 1: 0.15～1: 0.2 Hybrid Heating, rosined soap dissolved one-tenth concentrated foam agent afterwards with gelatine liquid and rosined soap;
(3) prepare foam mud, concentrated foam agent and water that step (2) is obtained mixed stirring formation foaming agent in the adding whisking machine by weight 1: 8～1: 9, be mixed into foam mud with mud then;
(4) shaping and drying in the foam mud injection moulding mould with step (3) acquisition, places under 15～35 ℃ of environment and is dried to blank, dry back blank water cut＜4%;
(5) burn till, blank is piled up in kiln, afterwards adopted oxidizing atmosphere to burn till 1300～1400 ℃ of firing temperatures, firing time 144～168 hours.
2. the method for manufacture of Industrial Stoves thermofin low heat conduction light refractory brick according to claim 1; It is characterized in that: the mud raw material comprises following weight ratio ingredient in the said step (1): commercial alumina 12%, flint clay grog 15%, Suzhou soil 5%, feldspar 5%, talcum 3%, alum 3.5%, all the other are bauxitic clay.
3. the method for manufacture of Industrial Stoves thermofin low heat conduction light refractory brick according to claim 1; It is characterized in that: foaming agent churning time in whisking machine is 12～18 minutes in the said step (3); Mixing speed is 180～200 rev/mins; Foaming agent mixed churning time 15～18 minutes with mud, mixing speed is 250～300 rev/mins.
4. the method for manufacture of Industrial Stoves thermofin low heat conduction light refractory brick according to claim 1 is characterized in that: in said step (5) sintering process, it is 115～120 hours that the interior temperature of kiln rises to 1000 ℃ of required heat-up times by normal temperature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106431362A (en) * | 2016-08-30 | 2017-02-22 | 山东磊宝锆业科技股份有限公司 | Production method of bauxite composite aluminum silicate fiber brick |
| CN112876225A (en) * | 2021-02-08 | 2021-06-01 | 新疆硅质耐火材料有限公司 | Sintered high-temperature-resistant light heat-insulating material and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382664A (en) * | 2001-04-26 | 2002-12-04 | 河南省登封市第二耐火材料总厂 | Acid-resistant refractory brick and its preparing process |
| CN101412631A (en) * | 2008-11-12 | 2009-04-22 | 平顶山新型耐材有限公司 | Light-weight refractory brick |
| CN101618968A (en) * | 2009-08-11 | 2010-01-06 | 郑州东方炉衬材料有限公司 | Ultra-microporous lightweight insulated firebrick and manufacture method thereof |
| WO2011066842A1 (en) * | 2009-12-02 | 2011-06-09 | Promat Gmbh | Composition for a light-weight refractory brick having a high anorthite percentage |
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2012
- 2012-08-28 CN CN201210310541.5A patent/CN102815962B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382664A (en) * | 2001-04-26 | 2002-12-04 | 河南省登封市第二耐火材料总厂 | Acid-resistant refractory brick and its preparing process |
| CN101412631A (en) * | 2008-11-12 | 2009-04-22 | 平顶山新型耐材有限公司 | Light-weight refractory brick |
| CN101618968A (en) * | 2009-08-11 | 2010-01-06 | 郑州东方炉衬材料有限公司 | Ultra-microporous lightweight insulated firebrick and manufacture method thereof |
| WO2011066842A1 (en) * | 2009-12-02 | 2011-06-09 | Promat Gmbh | Composition for a light-weight refractory brick having a high anorthite percentage |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106431362A (en) * | 2016-08-30 | 2017-02-22 | 山东磊宝锆业科技股份有限公司 | Production method of bauxite composite aluminum silicate fiber brick |
| CN112876225A (en) * | 2021-02-08 | 2021-06-01 | 新疆硅质耐火材料有限公司 | Sintered high-temperature-resistant light heat-insulating material and preparation method thereof |
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| CN102815962B (en) | 2014-09-10 |
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