CN107759236A - The production technology of fused cast mullite brick - Google Patents
The production technology of fused cast mullite brick Download PDFInfo
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- CN107759236A CN107759236A CN201610690946.4A CN201610690946A CN107759236A CN 107759236 A CN107759236 A CN 107759236A CN 201610690946 A CN201610690946 A CN 201610690946A CN 107759236 A CN107759236 A CN 107759236A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/653—Processes involving a melting step
- C04B35/657—Processes involving a melting step for manufacturing refractories
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6022—Injection moulding
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
- C04B2235/661—Multi-step sintering
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
- C04B2235/661—Multi-step sintering
- C04B2235/662—Annealing after sintering
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- Manufacturing & Machinery (AREA)
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Abstract
The invention discloses the production technology of fused cast mullite brick, comprise the following steps：（1）, choose raw material and dispensing；（2）, raw material is melted；（3）, cast；（4）, heat treatment, be divided into crystallization and annealing two stages；1. crystallizing, 2. anneal, i.e. the cooling of cast article；（5）, cast article is machined.The present invention, through test of many times, by using high-purity raw material, adjusts smelting process to solve the problem of Cracking of product, and Mold Making technique is improved, and takes advanced insulation annealing method, so as to efficiently solve crack problem caused by product.
Description
Technical field
The invention belongs to the production technology of technical field of fire resistant material production, more particularly to fused cast mullite brick.
Background technology
Casting mullite brick is the sial system refractory product using mullite as principal crystalline phase.Because the principal crystalline phase of mullite brick is not
Carry out stone, therefore the refractoriness of mullite, at 1850 DEG C or so, refractoriness under load is high, and high temperature creep rate is low, good thermal shock, resistance to
Sour corrosion.For the superstructure of many kilns, the superstructure of feeding machine.
Fused cast mullite brick mainly carries out dispensing by alumine or commercial alumina, clay or silica, in electric arc furnaces
Melting, then cast molding and annealing are made, and its main mineral constituent is mullite.Mullite composition is 3Al2O3·2SiO2~
2Al2O3·SiO2, between melting temperature is about 1827-1890 DEG C, hardness is big.When its high temperature solution cooling crystallization, can produce thick
Very much not uniform crystallization tendency, makes melt-cast products produce crack or crackle.
The content of the invention
The present invention is in order to solve weak point of the prior art, there is provided a kind of fully reduce even prevents melt-cast products production
The production technology of the fused cast mullite brick of raw crack or crackle.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：The production technology of fused cast mullite brick, including
Following steps,
（1）, choose raw material and dispensing：It is original from premium high-alumina alumina, high-quality red bauxite, import quality oxide aluminium and clay
Material；Ensure the aluminium silicon systems number in raw material, i.e. Al in dispensing2O3And SiO2Mass ratio is 2.3-2.9；Reducing agent addition amount regards raw material
Middle Fe203Depending on content, it is ensured that the iron for reducing lkg uses 0.2-0.25kg activated carbon, i.e., appropriate wood chip is added in dispensing；
Add the raw material into double-spiral mixer and stir；
（2）, melting：The raw material to stir is added to the three-phawse arc furnace of Automatic Control, using low-voltage, high current electric power
System, general voltage are 150~190V, and current strength is up to 1600~2000A, and melting temperature is between 1900~2200 DEG C；
（3）, cast：Liquation is injected in the model of presetting shape and size, through being cooled into definite shape and size
The homogeneous cast article of compact structure, tissue, cast article should have accurate size, to make processing capacity minimum；Cast is used
Model is with the higher quartz sand of purity, i.e. molding sand SiO2Content>98.5%, and the bonding agent for accounting for gross weight 5-8% is added,
Re-dry forms after mixed-forming；
（4）, heat treatment, be divided into crystallization and annealing two stages；1. crystallize：For fused mullite product, inside cast article
Mullite-Crystallization in threadiness or small grains, be uniformly distributed；The principal element for determining grain size is cooling velocity；From
Al2O3-SiO2It is that mullite is congruent melting compound knowable to the research of balance chart, crystallization is directly solidified from liquation, not
Corundum is separated out in advance；But when containing a number of flux in liquation, fused mass separates out corundum first in cooling, and not
Carrying out stone crystal will just start stably to separate out below 1750~1800 DEG C；Should be maintained at fused mass start crystallization to 1800 DEG C it
Between within the temperature range of cool down rapidly, and in the temperature for starting crystallization less than mullite, give appropriate soaking time, sufficiently
Slow cooling, so that the corundum crystal grain that early stage separates out has enough time to act on forming mullite with liquation, so that in product
Mullite has the content of maximum；
2. anneal, i.e. the cooling of cast article；Cast article is in cooling procedure after crystallization, because each several part radiating is uneven,
Make thermograde inside cast article be present, produce very big stress, cracking or truncation, the waste product of unfilled corner can be caused；Cooling velocity
Bigger, tendency is also bigger caused by waste product；Therefore, the necessary Slow cooling of casting, annealing naturally is by good outside model
Thermal insulation layer, heat insulating material layer is made using vermiculite；Cooling velocity is adjusted by the thickness of thermal insulation layer；Slow cooling temperature range, it is main
If at 1800~1100 DEG C, slow cooling speed general control is in 60~70 DEG C/h.
（5）, cast article is machined：Because the shape of model is not accurate enough, and casting when above and below receive
Contract inconsistent, shrinkage cavity, and casting nozzle and surface fold can be produced, be both needed to carry out cutting processing, could use；But because casting is hard
Degree is very big, and processing is highly difficult, and the coarse grain skive that generally use phenolic resin combines is cut.
The step（1）In the Fe that contains203、TiO2, CaO percentage by weight be defined to respectively：Fe203<1.5%,
TiO2<3.0%, CaO<1.0%；Alumine and red bauxite raw material carry out pre-burning before dispensing, constitution water are excluded, to avoid
When electric arc furnaces internal cause water vapour concentrates decomposition discharge, produce detonation and simultaneously cause splash.
Using above-mentioned technical proposal, correct selection composition is to produce mullite content height, and corundum and glass are mutually few
The important process condition of melt-cast products.The aluminium silicon systems number (Al of dispensing2O3/SiO2Mass ratio) characterize Al in dispensing2O3And SiO2's
Relative amount.Theoretically analyze, it should using the aluminium silicon systems number (2.8~2.9) during mullite solid solution critical composition.But
During high-temperature fusion, Si02Volatilization and reduction reaction to consume a part of SiO2, make Al in dispensing2O3Content relative improve.Cause
This, in actual dispensing, the controlling value of aluminium silicon systems number is lower than theoretical value, and general desirable 2.5 or so.Reducing agent addition amount regards raw material
Middle Fe203Depending on content, unsuitable excessive, reducing lkg iron about needs 0.225kg activated carbon.If addition is excessive, will necessarily make
SiO2The quantity being reduced is excessive, influences mullite quantity.To make caused gas in melting process be easy to escape, in dispensing
Add appropriate wood chip.
In summary, the present invention is in order to solve the problem of Cracking of product, through test of many times, by using high-purity raw material,
Smelting process is adjusted, and Mold Making technique is improved, and takes advanced insulation annealing method, so as to effectively solve
Crack problem caused by product.
Embodiment
The production technology of the fused cast mullite brick of the present invention, comprises the following steps：
（1）, choose raw material and dispensing：It is original from premium high-alumina alumina, high-quality red bauxite, import quality oxide aluminium and clay
Material；Ensure the aluminium silicon systems number in raw material, i.e. Al in dispensing2O3And SiO2Mass ratio is 2.3-2.9；Reducing agent addition amount regards raw material
Middle Fe203Depending on content, it is ensured that the iron for reducing lkg uses 0.2-0.25kg activated carbon, i.e., appropriate wood chip is added in dispensing；
Add the raw material into double-spiral mixer and stir；
（2）, melting：The raw material to stir is added to the three-phawse arc furnace of Automatic Control, using low-voltage, high current electric power
System, general voltage are 150~190V, and current strength is up to 1600~2000A, and melting temperature is between 1900~2200 DEG C；
（3）, cast：Liquation is injected in the model of presetting shape and size, through being cooled into definite shape and size
The homogeneous cast article of compact structure, tissue, cast article should have accurate size, to make processing capacity minimum；Cast is used
Model is with the higher quartz sand of purity, i.e. molding sand SiO2Content>98.5%, and the bonding agent for accounting for gross weight 5-8% is added,
Re-dry forms after mixed-forming；
（4）, heat treatment, be divided into crystallization and annealing two stages；1. crystallize：For fused mullite product, inside cast article
Mullite-Crystallization in threadiness or small grains, be uniformly distributed；The principal element for determining grain size is cooling velocity；From
Al2O3-SiO2It is that mullite is congruent melting compound knowable to the research of balance chart, crystallization is directly solidified from liquation, not
Corundum is separated out in advance；But when containing a number of flux in liquation, fused mass separates out corundum first in cooling, and not
Carrying out stone crystal will just start stably to separate out below 1750~1800 DEG C；Should be maintained at fused mass start crystallization to 1800 DEG C it
Between within the temperature range of cool down rapidly, and in the temperature for starting crystallization less than mullite, give appropriate soaking time, sufficiently
Slow cooling, so that the corundum crystal grain that early stage separates out has enough time to act on forming mullite with liquation, so that in product
Mullite has the content of maximum；
2. anneal, i.e. the cooling of cast article；Cast article is in cooling procedure after crystallization, because each several part radiating is uneven,
Make thermograde inside cast article be present, produce very big stress, cracking or truncation, the waste product of unfilled corner can be caused；Cooling velocity
Bigger, tendency is also bigger caused by waste product；Therefore, the necessary Slow cooling of casting, annealing naturally is by good outside model
Thermal insulation layer, heat insulating material layer is made using vermiculite；Cooling velocity is adjusted by the thickness of thermal insulation layer；Slow cooling temperature range, it is main
If at 1800~1100 DEG C, slow cooling speed general control is in 60~70 DEG C/h.
（5）, cast article is machined：Because the shape of model is not accurate enough, and casting when above and below receive
Contract inconsistent, shrinkage cavity, and casting nozzle and surface fold can be produced, be both needed to carry out cutting processing, could use；But because casting is hard
Degree is very big, and processing is highly difficult, and the coarse grain skive that generally use phenolic resin combines is cut.
The step（1）In the Fe that contains203、TiO2, CaO percentage by weight be defined to respectively：Fe203<1.5%,
TiO2<3.0%, CaO<1.0%；Alumine and red bauxite raw material carry out pre-burning before dispensing, constitution water are excluded, to avoid
When electric arc furnaces internal cause water vapour concentrates decomposition discharge, produce detonation and simultaneously cause splash.
Claims (2)
1. the production technology of fused cast mullite brick, it is characterised in that：Comprise the following steps,
（1）, choose raw material and dispensing：It is original from premium high-alumina alumina, high-quality red bauxite, import quality oxide aluminium and clay
Material；Ensure the aluminium silicon systems number in raw material, i.e. Al in dispensing2O3And SiO2Mass ratio is 2.3-2.9；Reducing agent addition amount regards raw material
Middle Fe203Depending on content, it is ensured that the iron for reducing lkg uses 0.2-0.25kg activated carbon, i.e., appropriate wood chip is added in dispensing；
Add the raw material into double-spiral mixer and stir；
（2）, melting：The raw material to stir is added to the three-phawse arc furnace of Automatic Control, using low-voltage, high current electric power
System, general voltage are 150~190V, and current strength is up to 1600~2000A, and melting temperature is between 1900~2200 DEG C；
（3）, cast：Liquation is injected in the model of presetting shape and size, through being cooled into definite shape and size
The homogeneous cast article of compact structure, tissue, cast article should have accurate size, to make processing capacity minimum；Cast is used
Model is with the higher quartz sand of purity, i.e. molding sand SiO2Content>98.5%, and the bonding agent for accounting for gross weight 5-8% is added,
Re-dry forms after mixed-forming；
（4）, heat treatment, be divided into crystallization and annealing two stages；1. crystallize：For fused mullite product, inside cast article
Mullite-Crystallization in threadiness or small grains, be uniformly distributed；The principal element for determining grain size is cooling velocity；From
Al2O3-SiO2It is that mullite is congruent melting compound knowable to the research of balance chart, crystallization is directly solidified from liquation, not
Corundum is separated out in advance；But when containing a number of flux in liquation, fused mass separates out corundum first in cooling, and not
Carrying out stone crystal will just start stably to separate out below 1750~1800 DEG C；Should be maintained at fused mass start crystallization to 1800 DEG C it
Between within the temperature range of cool down rapidly, and in the temperature for starting crystallization less than mullite, give appropriate soaking time, sufficiently
Slow cooling, so that the corundum crystal grain that early stage separates out has enough time to act on forming mullite with liquation, so that in product
Mullite has the content of maximum；
2. anneal, i.e. the cooling of cast article；Cast article is in cooling procedure after crystallization, because each several part radiating is uneven,
Make thermograde inside cast article be present, produce very big stress, cracking or truncation, the waste product of unfilled corner can be caused；Cooling velocity
Bigger, tendency is also bigger caused by waste product；Therefore, the necessary Slow cooling of casting, annealing naturally is by good outside model
Thermal insulation layer, heat insulating material layer is made using vermiculite；Cooling velocity is adjusted by the thickness of thermal insulation layer；Slow cooling temperature range, it is main
If at 1800~1100 DEG C, slow cooling speed general control is in 60~70 DEG C/h；
（5）, cast article is machined：Because the shape of model is not accurate enough, and casting when above and below shrink not
Unanimously, shrinkage cavity, and casting nozzle and surface fold can be produced, is both needed to carry out cutting processing, could use；But due to casting hardness very
Greatly, processing is highly difficult, and the coarse grain skive that generally use phenolic resin combines is cut.
2. the production technology of fused cast mullite brick according to claim 1, it is characterised in that：The step（1）In contain
Fe203、TiO2, CaO percentage by weight be defined to respectively：Fe203<1.5%, TiO2<3.0%, CaO<1.0%；High alumina alum
Soil and red bauxite raw material carry out pre-burning before dispensing, exclude constitution water, to avoid concentrating the row of decomposition in electric arc furnaces internal cause water vapour
When going out, produce detonation and cause splash.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610690946.4A CN107759236A (en) | 2016-08-20 | 2016-08-20 | The production technology of fused cast mullite brick |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610690946.4A CN107759236A (en) | 2016-08-20 | 2016-08-20 | The production technology of fused cast mullite brick |
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| CN107759236A true CN107759236A (en) | 2018-03-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113510823A (en) * | 2021-06-23 | 2021-10-19 | 河南省瑞泰科实业集团有限公司 | Heat insulation molding method and heat insulation box of fusion-cast high-purity alumina refractory product and refractory product obtained by heat insulation molding method |
| CN114105653A (en) * | 2020-08-25 | 2022-03-01 | 中国科学院理化技术研究所 | A kind of method to strengthen the performance of magnesia refractory |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102241521A (en) * | 2010-05-13 | 2011-11-16 | 郑州振中电熔锆业有限公司 | High-temperature wear-resistance brick and casting method thereof |
-
2016
- 2016-08-20 CN CN201610690946.4A patent/CN107759236A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102241521A (en) * | 2010-05-13 | 2011-11-16 | 郑州振中电熔锆业有限公司 | High-temperature wear-resistance brick and casting method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李红霞主编: "《耐火材料手册》", 31 January 2007, 北京：冶金工业出版社 * |
| 鞍山钢铁学院耐火材料教研室编: "《耐火材料生产》", 28 February 1981, 北京：冶金工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105653A (en) * | 2020-08-25 | 2022-03-01 | 中国科学院理化技术研究所 | A kind of method to strengthen the performance of magnesia refractory |
| CN114105653B (en) * | 2020-08-25 | 2022-10-28 | 中国科学院理化技术研究所 | Method for strengthening performance of magnesium refractory material |
| CN113510823A (en) * | 2021-06-23 | 2021-10-19 | 河南省瑞泰科实业集团有限公司 | Heat insulation molding method and heat insulation box of fusion-cast high-purity alumina refractory product and refractory product obtained by heat insulation molding method |
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