CN112194470A - Chromium corundum composite brick for rotary kiln of hazardous waste incinerator and preparation method thereof - Google Patents
Chromium corundum composite brick for rotary kiln of hazardous waste incinerator and preparation method thereof Download PDFInfo
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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
- C04B35/10—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 aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- 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
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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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
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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Abstract
The invention discloses a chromium corundum composite brick for a rotary kiln of a hazardous waste incinerator, which comprises a heavy part and a light part, wherein the heavy part adopts chromium oxide, sintered corundum, fused corundum, mullite and active alumina micro powder, the light part adopts light corundum aggregate and composite light burning powder, and the heavy part and the light part are sintered at high temperature to form a light and heavy integrated brick body. The light part is used as an insulating layer, and the heavy part is used as a working layer. The invention also discloses a preparation method of the corundum composite brick. Compared with the prior corundum brick and insulating brick, the corundum composite brick prepared by the method has a stable structure in technical performance, relatively increases the effective working thickness of the working layer under the condition of not increasing the total thickness, and prolongs the service life.
Description
Technical Field
The invention relates to a corundum composite brick, in particular to a chromium corundum composite brick for a rotary kiln of a hazardous waste incinerator and a preparation method thereof.
Background
The brick for the rotary kiln of the existing hazardous waste incinerator is generally divided into two layers, one layer is used as a working layer, the other layer is used as a heat insulation layer, the two layers are independent and do not influence each other, a partial gap can exist between the working layer and the heat insulation layer, the thickness of the working layer is generally 23cm, the thickness of the heat insulation layer is generally 7cm, however, in actual use, after the working layer is continuously worn by 15cm, the rear part is too short, the circular working layer structure cannot be continuously maintained due to insufficient arching force, and therefore the service life of the working layer is 15cm consumed on the inner side.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the problem that the brick for the rotary kiln of the conventional hazardous waste incinerator has a short service life on the premise that a working layer needs to maintain an annular structure due to the adoption of a two-layer separation structure.
The technical scheme is as follows: in order to achieve the purpose, the invention provides the following technical scheme:
the chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator comprises a heavy part and a light part, wherein the heavy part comprises chromium oxide, sintered corundum, fused corundum, mullite and active alumina micropowder, the light part comprises light corundum aggregate and composite light burning powder, the heavy part and the light part form light and heavy integration through high-temperature sintering, the light part serves as a heat insulation layer, and the heavy part serves as a brick body of a working layer.
The heavy part is used as a working layer, the light part is used as an insulating layer, and then the heavy part and the light part are integrated into a composite brick, so that one side of the current composite brick can be used as the working layer, and the other side of the current composite brick can be used as the insulating layer.
For the heavy fraction: because of the corrosivity of the materials in the kiln, the chromium oxide is added to improve the anti-corrosion performance, the sintered corundum is used as a main refractory raw material, the fused corundum is used for reducing the porosity, and the mullite is used for improving the overall thermal shock stability.
For the light fraction: the lightweight corundum aggregate is synthesized by a corundum firing machine, is used for reducing the volume density and the heat conductivity coefficient (meanwhile, the sintering temperature of the lightweight and heavy parts is close to the sintering temperature), the lightweight firing powder is made of a composite material of alumina, corundum, mullite and clay, so that the lightweight and heavy parts can be sintered at the same temperature as much as possible, and after the lightweight corundum aggregate is added, the material shrinkage ratio of the joint of the lightweight and heavy parts can be kept consistent under the condition of not reducing the firing temperature.
In contrast, there is a design in which lightweight corundum aggregate is used instead of the light burned powder, but the shrinkage ratio of the bonded portion is not buffered by the light burned powder, so that the lightweight portion is severely deformed.
Because this product is applied to the useless incinerator rotary kiln of danger, the structure of so product does but not only be limited to: the light part is used as a tail part, the heavy part is used as a head part, and the width of the composite brick is smaller and smaller in the length direction of the tail part towards the head part.
The light part is used as a heat insulation layer, the heavy part is used as a working layer at the outer side, the heavy part is used as a circular ring at the inner side, and the length of the outer diameter is obviously greater than that of the inner diameter.
Further, the heavy part of the corundum composite brick comprises 30-70 parts of sintered corundum, 30-70 parts of fused corundum, 0-50 parts of mullite, 5-10 parts of active alumina micro powder and 0-10 parts of chromium oxide in parts by weight; the light part comprises 50-70 parts by weight of light corundum aggregate and 30-60 parts by weight of composite light calcined powder.
Further, the composite light calcined powder is obtained by mixing and calcining alumina, corundum, mullite and clay at 1450 ℃.
Furthermore, in the heavy part, the components are sequentially sintered corundum, mullite, fused corundum, chromium oxide and active alumina micro powder according to the particle size from large to small, and the particle size of the active alumina micro powder is not more than 2 microns.
The design is adopted to better reduce the porosity of the heavy part of the product through the penetration of the activated alumina micro powder.
A preparation method of a chromium corundum composite brick for a rotary kiln of a hazardous waste incinerator comprises the following steps:
1) weighing the components required by the heavy part and the light part according to the mixture ratio;
2) adding the components of the heavy part into a stirring kettle according to the particle size from large to small;
3) putting the heavy part material which is stirred and mixed into the heavy part of the mould of the composite brick;
4) lightly burning the mixture of alumina, corundum, mullite and clay at 1450 ℃ to obtain composite light burning powder;
5) adding the components of the light part into a stirring kettle at the same time for stirring;
6) putting the stirred and mixed light part material into the light part of the mould of the composite brick;
7) pressing the light and heavy parts tightly by a press machine to form a light and heavy integrated semi-finished product;
8) and sintering the obtained semi-finished corundum composite brick at 1600-1780 ℃ to form an integral brick.
Further, in the step 7), pressing is performed by adopting a mode of multiple times of vibration pressing until the semi-finished product meets the design requirement.
Has the advantages that: compared with the prior art, the invention has the advantages that:
by adopting the design scheme of the invention, compared with the prior art, the prepared composite brick has better structural stability and greatly prolonged service life.
Further, because the heavy part and the light part are completely combined on the same composite brick at present, according to the design, the heavy part is 23cm, the light part is 7cm, and under the condition of maintaining the circular frame, when the 23cm is completely worn by actual tests, the circular frame can still be completely maintained, so that the service life of the composite brick is greatly prolonged.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
Example 1
The chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator comprises a heavy part and a light part, wherein the heavy part adopts chromium oxide, sintered corundum, fused corundum, mullite and active alumina micropowder, the light part adopts light corundum aggregate and composite light burning powder, the heavy part and the light part form light and heavy integration through high-temperature sintering, the light part serves as a heat insulation layer, and the heavy part serves as a brick body of a working layer.
The heavy part is used as a working layer, the light part is used as an insulating layer, and then the heavy part and the light part are integrated into a composite brick, so that one side of the current composite brick can be used as the working layer, and the other side of the current composite brick can be used as the insulating layer.
For the heavy fraction: because of the corrosivity of the materials in the kiln, the chromium oxide is added to improve the anti-corrosion performance, the sintered corundum is used as a main refractory raw material, the fused corundum is used for reducing the porosity, and the mullite is used for improving the overall thermal shock stability.
For the light fraction: the lightweight corundum aggregate is synthesized by a corundum firing machine, is used for reducing the volume density and the heat conductivity coefficient (meanwhile, the sintering temperature of the lightweight and heavy parts is close to the sintering temperature), the lightweight firing powder is made of a composite material of alumina, corundum, mullite and clay, so that the lightweight and heavy parts can be sintered at the same temperature as much as possible, and after the lightweight corundum aggregate is added, the material shrinkage ratio of the joint of the lightweight and heavy parts can be kept consistent under the condition of not reducing the firing temperature.
In contrast, there is a design in which lightweight corundum aggregate is used instead of the light burned powder, but the shrinkage ratio of the bonded portion is not buffered by the light burned powder, so that the lightweight portion is severely deformed.
Because this product is applied to the useless incinerator rotary kiln of danger, the structure of so product does but not only be limited to: the light part is used as a tail part, the heavy part is used as a head part, and the width of the composite brick is smaller and smaller in the length direction of the tail part towards the head part.
The light part is used as a heat insulation layer, the heavy part is used as a working layer at the outer side, the heavy part is used as a circular ring at the inner side, and the length of the outer diameter is obviously greater than that of the inner diameter.
The heavy part of the corundum composite brick comprises 70 parts of sintered corundum, 70 parts of fused corundum, 50 parts of mullite, 10 parts of active alumina micro powder and 10 parts of chromium oxide according to parts by weight; the light part comprises 70 parts of light corundum aggregate and 60 parts of composite light calcined powder according to weight parts.
The composite light-burned powder is obtained by mixing and calcining alumina, corundum, mullite and clay at 1450 ℃.
In the heavy part, the components are sequentially sintered corundum, mullite, fused corundum, chromium oxide and active alumina micro powder according to the particle size from large to small, and the particle size of the active alumina micro powder is not more than 2 microns.
The design is adopted to better reduce the porosity of the heavy part of the product through the penetration of the activated alumina micro powder.
The final product has the following test indexes:
example 2
The chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator comprises a heavy part and a light part, wherein the heavy part adopts chromium oxide, sintered corundum, fused corundum, mullite and active alumina micropowder, the light part adopts light corundum aggregate and composite light burning powder, the heavy part and the light part form light and heavy integration through high-temperature sintering, the light part serves as a heat insulation layer, and the heavy part serves as a brick body of a working layer.
The heavy part is used as a working layer, the light part is used as an insulating layer, and then the heavy part and the light part are integrated into a composite brick, so that one side of the current composite brick can be used as the working layer, and the other side of the current composite brick can be used as the insulating layer.
For the heavy fraction: because of the corrosivity of the materials in the kiln, the chromium oxide is added to improve the anti-corrosion performance, the sintered corundum is used as a main refractory raw material, the fused corundum is used for reducing the porosity, and the mullite is used for improving the overall thermal shock stability.
For the light fraction: the lightweight corundum aggregate is synthesized by a corundum firing machine, is used for reducing the volume density and the heat conductivity coefficient (meanwhile, the sintering temperature of the lightweight and heavy parts is close to the sintering temperature), the lightweight firing powder is made of a composite material of alumina, corundum, mullite and clay, so that the lightweight and heavy parts can be sintered at the same temperature as much as possible, and after the lightweight corundum aggregate is added, the material shrinkage ratio of the joint of the lightweight and heavy parts can be kept consistent under the condition of not reducing the firing temperature.
In contrast, there is a design in which lightweight corundum aggregate is used instead of the light burned powder, but the shrinkage ratio of the bonded portion is not buffered by the light burned powder, so that the lightweight portion is severely deformed.
Because this product is applied to the useless incinerator rotary kiln of danger, the structure of so product does but not only be limited to: the light part is used as a tail part, the heavy part is used as a head part, and the width of the composite brick is smaller and smaller in the length direction of the tail part towards the head part.
The light part is used as a heat insulation layer, the heavy part is used as a working layer at the outer side, the heavy part is used as a circular ring at the inner side, and the length of the outer diameter is obviously greater than that of the inner diameter.
The heavy part of the corundum composite brick comprises 30 parts of sintered corundum, 30 parts of fused corundum and 5 parts of active alumina micropowder by weight; the light part comprises 50 parts of light corundum aggregate and 30 parts of composite light calcined powder according to weight parts.
The composite light-burned powder is obtained by mixing and calcining alumina, corundum, mullite and clay at 1450 ℃.
In the heavy part, the components are sequentially sintered corundum, mullite, fused corundum, chromium oxide and active alumina micro powder according to the particle size from large to small, and the particle size of the active alumina micro powder is not more than 2 microns.
The design is adopted to better reduce the porosity of the heavy part of the product through the penetration of the activated alumina micro powder.
The obtained product test indexes are as follows:
example 3
The chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator comprises a heavy part and a light part, wherein the heavy part adopts chromium oxide, sintered corundum, fused corundum, mullite and active alumina micropowder, the light part adopts light corundum aggregate and composite light burning powder, the heavy part and the light part form light and heavy integration through high-temperature sintering, the light part serves as a heat insulation layer, and the heavy part serves as a brick body of a working layer.
The heavy part is used as a working layer, the light part is used as an insulating layer, and then the heavy part and the light part are integrated into a composite brick, so that one side of the current composite brick can be used as the working layer, and the other side of the current composite brick can be used as the insulating layer.
For the heavy fraction: because of the corrosivity of the materials in the kiln, the chromium oxide is added to improve the anti-corrosion performance, the sintered corundum is used as a main refractory raw material, the fused corundum is used for reducing the porosity, and the mullite is used for improving the overall thermal shock stability.
For the light fraction: the lightweight corundum aggregate is synthesized by a corundum firing machine, is used for reducing the volume density and the heat conductivity coefficient (meanwhile, the sintering temperature of the lightweight and heavy parts is close to the sintering temperature), the lightweight firing powder is made of a composite material of alumina, corundum, mullite and clay, so that the lightweight and heavy parts can be sintered at the same temperature as much as possible, and after the lightweight corundum aggregate is added, the material shrinkage ratio of the joint of the lightweight and heavy parts can be kept consistent under the condition of not reducing the firing temperature.
In contrast, there is a design in which lightweight corundum aggregate is used instead of the light burned powder, but the shrinkage ratio of the bonded portion is not buffered by the light burned powder, so that the lightweight portion is severely deformed.
Because this product is applied to the useless incinerator rotary kiln of danger, the structure of so product does but not only be limited to: the light part is used as a tail part, the heavy part is used as a head part, and the width of the composite brick is smaller and smaller in the length direction of the tail part towards the head part.
The light part is used as a heat insulation layer, the heavy part is used as a working layer at the outer side, the heavy part is used as a circular ring at the inner side, and the length of the outer diameter is obviously greater than that of the inner diameter.
The heavy part of the corundum composite brick comprises 70 parts of sintered corundum, 70 parts of fused corundum, 50 parts of mullite, 10 parts of active alumina micro powder and 10 parts of chromium oxide according to parts by weight; the light part comprises 70 parts of light corundum aggregate and 60 parts of composite light calcined powder according to weight parts.
The composite light-burned powder is obtained by mixing and calcining alumina, corundum, mullite and clay at 1450 ℃.
In the heavy part, the components are sequentially sintered corundum, mullite, fused corundum, chromium oxide and active alumina micro powder according to the particle size from large to small, and the particle size of the active alumina micro powder is not more than 2 microns.
The design is adopted to better reduce the porosity of the heavy part of the product through the penetration of the activated alumina micro powder.
The technical indexes of the obtained product are as follows:
through three embodiments, the design of the invention can ensure that the fire-resistant temperature of the heavy part and the light part is as close as possible, the sintering temperature can be kept in the same interval, and the volume density, the porosity, the compressive strength of the light part and the content of the ferric oxide can be slightly changed by adjusting the components, but the overall technical index can be maintained above the conventional technical index in the field, and meanwhile, the technology can be continuously used on the premise of completely wearing the heavy part, thereby greatly prolonging the service life of the product.
Example 4
A preparation method of a chromium corundum composite brick for a rotary kiln of a hazardous waste incinerator comprises the following steps:
1) weighing the components required by the heavy part and the light part according to the mixture ratio;
2) adding the components of the heavy part into a stirring kettle according to the particle size from large to small;
3) putting the heavy part material which is stirred and mixed into the heavy part of the mould of the composite brick;
4) lightly burning the mixture of alumina, corundum, mullite and clay at 1450 ℃ to obtain composite light burning powder;
5) adding the components of the light part into a stirring kettle at the same time for stirring;
6) putting the stirred and mixed light part material into the light part of the mould of the composite brick;
7) pressing the light and heavy parts tightly by a press machine to form a light and heavy integrated semi-finished product;
and pressing by adopting a mode of multiple times of vibration and pressing until the semi-finished product meets the design requirement.
8) And sintering the obtained semi-finished corundum composite brick at 1600-1780 ℃ to form an integral brick.
Claims (6)
1. The utility model provides a dangerous useless burning furnace chrome corundum composite brick for rotary kiln which characterized in that: the brick comprises a heavy part and a light part, wherein the heavy part adopts chromium oxide, sintered corundum, fused corundum, mullite and active alumina micropowder, the light part adopts light corundum aggregate and composite light burning powder, the heavy part and the light part form light-weight and heavy-weight integration through high-temperature sintering, the light part serves as an insulating layer, and the heavy part serves as a brick body of a working layer.
2. The chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator according to claim 1, characterized in that: the heavy part comprises, by weight, 30-70 parts of sintered corundum, 30-70 parts of fused corundum, 0-50 parts of mullite, 5-10 parts of activated alumina micropowder and 0-10 parts of chromium oxide; the light part comprises 50-70 parts of light corundum aggregate and 30-60 parts of composite light calcined powder by weight.
3. The chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator according to claim 1 or 2, characterized in that: the composite light-burned powder is obtained by mixing and calcining alumina, corundum, mullite and clay at 1450 ℃.
4. The chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator according to claim 1, characterized in that: in the heavy part, the components are sequentially sintered corundum, mullite, fused corundum, chromium oxide and active alumina micro powder according to the particle size from large to small, and the particle size of the active alumina micro powder is not more than 2 microns.
5. The preparation method of the chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator according to claim 1, characterized by comprising the following steps: the method comprises the following steps:
1) weighing the components required by the heavy part and the light part according to the mixture ratio;
2) adding the components of the heavy part into a stirring kettle according to the particle size from large to small;
3) putting the heavy part material which is stirred and mixed into the heavy part of the mould of the composite brick;
4) lightly burning the mixture of alumina, corundum, mullite and clay at 1450 ℃ to obtain composite light-burned powder;
5) adding the components of the light part into a stirring kettle at the same time for stirring;
6) putting the stirred and mixed light part material into the light part of the mould of the composite brick;
7) pressing the light and heavy parts tightly by a press machine to form a light and heavy integrated semi-finished product;
8) and sintering the obtained semi-finished corundum composite brick at 1600-1780 ℃ to form an integral brick.
6. The preparation method of the chromium corundum composite brick for the rotary kiln of the hazardous waste incinerator according to claim 5, characterized by comprising the following steps: and 7), pressing by adopting a mode of multiple times of vibration pressing until the semi-finished product meets the design requirement.
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Cited By (4)
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| CN113135739A (en) * | 2021-04-27 | 2021-07-20 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of energy-saving refractory prefabricated part for ferronickel pre-reduction rotary kiln |
| CN113999029A (en) * | 2021-11-17 | 2022-02-01 | 江苏国豪耐火科技有限公司 | Low apparent porosity anti-chloride ion brick and preparation method thereof |
| CN114085071A (en) * | 2021-12-15 | 2022-02-25 | 无锡远能耐火材料有限公司 | High-chromium corundum refractory brick for high-temperature plasma melting furnace lining and preparation method thereof |
| CN115368117A (en) * | 2022-09-15 | 2022-11-22 | 山东理工大学 | Aluminum-silicon composite prefabricated member with different densities and preparation method thereof |
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| CN102230739A (en) * | 2011-06-06 | 2011-11-02 | 浙江大学 | Chromium corundum structure heat-insulation integrated composite brick and preparation method thereof |
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| CN113999029A (en) * | 2021-11-17 | 2022-02-01 | 江苏国豪耐火科技有限公司 | Low apparent porosity anti-chloride ion brick and preparation method thereof |
| CN114085071A (en) * | 2021-12-15 | 2022-02-25 | 无锡远能耐火材料有限公司 | High-chromium corundum refractory brick for high-temperature plasma melting furnace lining and preparation method thereof |
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