CN115819097A - Zirconium-mullite composite silicon carbide castable for garbage incinerator and prefabricated part - Google Patents
Zirconium-mullite composite silicon carbide castable for garbage incinerator and prefabricated part Download PDFInfo
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- CN115819097A CN115819097A CN202211646291.2A CN202211646291A CN115819097A CN 115819097 A CN115819097 A CN 115819097A CN 202211646291 A CN202211646291 A CN 202211646291A CN 115819097 A CN115819097 A CN 115819097A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a zirconium mullite composite silicon carbide castable for a waste incinerator, which comprises coarse aggregate, medium aggregate, fine aggregate, an additive, a bonding agent and explosion-proof fibers; the coarse aggregate comprises zirconium mullite particles with the particle size of 3-5mm, the middle aggregate comprises silicon carbide particles with the particle size of 1-2mm, the fine aggregate comprises zirconium mullite powder with the particle size of 0.1-0.6 mm, and the additive comprises alumina powder, silica powder and silicon micropowder. The pouring material provided by the invention also comprises a certain amount of additives, wherein the additives comprise alumina, silica and silica micropowder, the silica micropowder can fill tiny gaps of the material due to small particle size and reduce porosity, and the alumina and the silica react at high temperature to form a mullite structure, so that volume expansion is generated when the mullite structure is formed, pores formed by explosion-proof fibers can be blocked, and the apparent porosity is reduced.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a zirconium mullite composite silicon carbide castable for a garbage incinerator and a prefabricated member prepared from the castable.
Background
Because chemical waste incinerated by the industrial waste incinerator contains various substances with different properties, in the incineration process, the incineration products can generate great corrosion to a furnace lining. In addition, the requirement on the performance of refractory materials is particularly high because the heat value of materials burned by the incinerator is unstable and the temperature difference in the incinerator is large. However, the wear resistance, corrosion resistance, oxidation resistance and thermal shock stability of the refractory materials used in the industrial incinerator at present can not meet the technical requirements of the industrial incinerator, the service cycle is short, frequent repair or replacement is needed, the normal operation of the incinerator is affected, and a large amount of manpower and financial resources are consumed.
Patent document CN201911389561.4 discloses a zirconium mullite castable for a waste incineration kiln and a preparation process thereof, wherein the castable comprises the following components: zirconium mullite particles, zirconium mullite hollow spheres, zirconium mullite micro powder, silicon carbide micro powder, alumina micro powder, pure calcium aluminate cement and explosion-proof steel fibers, wherein the pore-reserving agent and the thermal expansion coefficient retarder are heated, volatilize and are used for increasing the thermal shock resistance of the castable in a pore-reserving mode. According to the technical scheme, the pore-reserving agent and the thermal expansion coefficient retarder are added into a zirconium-mullite system, so that the effect of prominent thermal shock resistance of the castable is achieved, the basic castable using effect is ensured together with a proper castable main material, the thermal shock resistance is good, and the castable is suitable for a refuse burning kiln, particularly a kiln opening flashboard part. However, the patent document causes a pore structure formed inside the product to have a negative influence on the structural strength of the product in order to improve the shock resistance of the product, and the presence of pores causes a reduction in the corrosion resistance of the product.
Disclosure of Invention
In order to solve the problems, the invention provides the zirconium-mullite composite silicon carbide castable for the waste incinerator, and a product prepared from the castable has good shock resistance, corrosion resistance and structural strength.
In order to achieve the purpose, the invention adopts the following technical scheme:
a zirconium mullite composite silicon carbide castable for a waste incinerator comprises coarse aggregate, medium aggregate, fine aggregate, an additive, a bonding agent and explosion-proof fiber; the coarse aggregate comprises zirconium mullite particles with the particle size of 3-5 mm, the medium aggregate comprises silicon carbide particles with the particle size of 1-2mm, the fine aggregate comprises zirconium mullite powder with the particle size of 0.1-0.6 mm, and the additive comprises alumina powder, silica powder and silicon micropowder.
The invention adopts a close packing mode to arrange aggregates, the aggregates are divided into coarse aggregates with the grain diameter of 3-5 mm, medium aggregates with the grain diameter of 1-2mm and fine aggregates with the grain diameter of 0.1-0.6 mm, and the aggregates with smaller grain diameter can be filled in the gaps of a packing structure formed by the aggregates with larger grain diameter to improve the packing density, thereby improving the structural strength and the fire-resistant and high-temperature-resistant performance of the finally prepared product. The coarse aggregate used in the invention is zirconium mullite, and zirconium dioxide in the zirconium mullite has the phase-change toughening property and can improve the mechanical property at high temperature, so that the zirconium mullite grains used as the coarse aggregate can improve the strength of the product at high temperature, and the zirconium mullite grain has good anti-seismic property especially for a flashboard part which is opened and closed frequently and movably; the medium aggregate is silicon carbide particles, the silicon carbide has excellent thermal stability and structural strength, generally does not react with other materials at high temperature, and has high thermal conductivity, so that the thermal stability of the product can be greatly improved; the fine aggregate is zirconium mullite, and the fine aggregate can wrap silicon carbide and form a whole with the coarse aggregate, so that the bonding performance between the silicon carbide and the coarse aggregate is improved during sintering and curing. The invention is also added with the explosion-proof fiber, the explosion-proof fiber can be melted, contracted and carbonized in the product forming process, and air holes are left at the original position, so that tiny network air holes are generated in the pouring structure, a water-gas channel can be opened, the internal stress is lightened, the explosion is prevented, and the integral service life is prolonged. The addition of the explosion-proof fibers improves the porosity of the product, reduces the heat resistance and the corrosion resistance of the product, and particularly has negative effects on a garbage incinerator which needs to deal with a high-temperature environment and a corrosion environment. On the other hand, the secondary mullite formed by the alumina and the silicon oxide can be combined with the zirconium mullite of the coarse aggregate and the fine aggregate, so that the combination effect of all the components is improved, the volume shrinkage of the product in the molding process is compensated to a certain extent, and the molding shrinkage is reduced.
Further, the binding agent is calcium aluminate cement.
Further, the length of the explosion-proof fiber is 5-10mm, and the diameter of the explosion-proof fiber is 15-35 μm.
Furthermore, the zirconium mullite grains and the zirconium mullite powder have a zirconium dioxide content of 20-30%.
Furthermore, the additive also comprises magnesium oxide powder. The magnesia powder and alumina can form magnesia-alumina spinel at high temperature, the volume expansion in the process of forming the magnesia-alumina spinel is larger than that of mullite, the shrinkage resistance and hole sealing effect of the additive can be improved, and the magnesia-alumina spinel also has excellent fire resistance. In addition, the magnesia can be inserted into the crystal phase of the zirconium mullite at high temperature to form zirconia with magnesia stability, so that the volume effect of the zirconia during phase change is reduced, and the mechanical property is improved.
Further, in the additive, by mass, the ratio of alumina: silicon oxide: magnesium oxide = (2.5 to 2.7): 1: (0.1 to 0.2).
Further, the addition amount of the explosion-proof fiber is 0.3 to 0.5 percent of the sum of the coarse aggregate, the medium aggregate and the fine aggregate.
Furthermore, the addition amount of the additive is 3-6% of the sum of the coarse aggregate, the medium aggregate and the fine aggregate.
Further, in the castable, by mass, a coarse aggregate: medium aggregate: fine aggregate =1: (1.8 to 2.3): (1.2 to 1.4).
Further, the castable comprises the following raw materials in parts by mass: 15-20 parts of coarse aggregate, 25-35 parts of middle aggregate, 20-25 parts of fine aggregate, 0.2-0.5 part of explosion-proof fiber, 8978 parts of additive, 8978 parts of zxft, and 5-10 parts of binding agent.
The invention also aims to provide a prefabricated member which is prepared by mixing the pouring material and water to form slurry and then pouring.
In summary, the following beneficial effects can be achieved by applying the scheme of the invention:
1. the aggregate is arranged in a close packing manner, the aggregate is composed of coarse aggregate with the grain diameter of 3-5 mm, medium aggregate with the grain diameter of 1-2mm and fine aggregate with the grain diameter of 0.1-0.6 mm, and the aggregate with the smaller grain diameter can be filled in a gap of a packing structure formed by the aggregate with the larger grain diameter to improve the packing density, so that the structural strength and the fire resistance and high temperature resistance of a finally prepared product are improved.
2. The coarse aggregate used in the invention is zirconium mullite, and zirconium dioxide in the zirconium mullite has the phase-change toughening property and can improve the mechanical property at high temperature, so that the zirconium mullite grains used as the coarse aggregate can improve the strength of the product at high temperature, and the zirconium mullite grain has good anti-seismic property especially for a flashboard part which is opened and closed frequently and movably; the medium aggregate is silicon carbide particles, the silicon carbide has excellent thermal stability and structural strength, generally does not react with other materials at high temperature, and has high thermal conductivity, so that the thermal stability of the product can be greatly improved; the fine aggregate is zirconium mullite, the fine aggregate can wrap silicon carbide and is integrated with the coarse aggregate, and the bonding performance between the silicon carbide and the coarse aggregate is improved during sintering and curing.
3. The invention is also added with the explosion-proof fiber, the explosion-proof fiber can be melted, contracted and carbonized in the product forming process, and air holes are left at the original positions, so that tiny network air holes are generated in the pouring structure, a water-gas channel can be opened, the internal stress is lightened, the explosion is prevented, and the integral service life is prolonged.
4. The pouring material provided by the invention also comprises a certain amount of additives, wherein the additives comprise alumina, silica and silica micropowder, the silica micropowder can fill tiny gaps of the material due to small particle size and reduce porosity, and the alumina and the silica react at high temperature to form a mullite structure, so that volume expansion is generated when the mullite structure is formed, pores formed by explosion-proof fibers can be blocked, and the apparent porosity is reduced. On the other hand, the secondary mullite formed by the alumina and the silicon oxide can be combined with the zirconium mullite of the coarse aggregate and the fine aggregate, so that the combination effect of all the components is improved, the volume shrinkage of the product in the molding process is compensated to a certain extent, and the molding shrinkage is reduced.
5. In some embodiments of the present invention, the additive may further include a certain amount of magnesium oxide, the magnesium oxide reacts with aluminum oxide to form spinel, the volume expansion is more obvious, the shrinkage resistance and the sealing effect of the additive can be improved, and the magnesium aluminate spinel has excellent refractory performance. In addition, the magnesia can be inserted into the crystal phase of the zirconium mullite at high temperature to form zirconia with magnesia stability, so that the volume effect of the zirconia during phase change is reduced, and the mechanical property is improved.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
Example 1
The embodiment provides a zirconium mullite composite silicon carbide castable for a waste incinerator, which comprises the following components: 15 parts of zirconium mullite particles with the particle size of 3-5 mm, 25 parts of silicon carbide particles with the particle size of 1-2mm, 20 parts of zirconium mullite powder with the particle size of 0.1-0.6 mm, 0.25 part of polypropylene explosion-proof fiber with the length of 5-10mm and the diameter of 15-35 mu m, 1.3 parts of alumina, 0.5 part of silicon oxide, 0.1 part of magnesium oxide and 6 parts of aluminum silicate cement.
Taking a certain amount of the castable, adding water accounting for 8 percent of pouring amount by weight, uniformly stirring to obtain pouring slurry, pouring the pouring slurry into a mold for casting molding, demolding, maintaining, heating and baking to obtain the prefabricated member.
Example 2
The embodiment provides a zirconium mullite composite silicon carbide castable for a waste incinerator, which comprises the following components: 20 parts of zirconium mullite particles with the particle size of 3-5 mm, 30 parts of silicon carbide particles with the particle size of 1-2mm, 25 parts of zirconium mullite powder with the particle size of 0.1-0.6 mm, 0.3 part of polypropylene explosion-proof fiber with the length of 5-10mm and the diameter of 15-35 mu m, 1.8 parts of alumina, 0.7 part of silicon oxide, 0.1 part of magnesium oxide and 10 parts of aluminum silicate cement.
Taking a certain amount of the castable, adding water accounting for 8 percent of pouring amount by weight, uniformly stirring to obtain pouring slurry, pouring the pouring slurry into a mold for casting molding, demolding, maintaining, heating and baking to obtain the prefabricated member.
Example 3
The embodiment provides a zirconium mullite composite silicon carbide castable for a waste incinerator, which comprises the following components: 20 parts of zirconium mullite particles with the particle size of 3-5 mm, 30 parts of silicon carbide particles with the particle size of 1-2mm, 25 parts of zirconium mullite powder with the particle size of 0.1-0.6 mm, 0.3 part of polypropylene explosion-proof fiber with the length of 5-10mm and the diameter of 15-35 mu m, 1.8 parts of alumina, 0.7 part of silicon oxide and 10 parts of aluminum silicate cement.
Taking a certain amount of the pouring material, adding 8 percent by weight of water into the pouring amount, uniformly stirring to obtain pouring slurry, pouring the pouring slurry into a mold for casting molding, demolding, maintaining, heating and baking to obtain the prefabricated member.
Comparative example 1
This comparative example provides a castable material, the composition of which comprises: 15 parts of zirconium mullite particles with the particle size of 3-5mm, 25 parts of silicon carbide particles with the particle size of 1-2mm, 20 parts of zirconium mullite powder with the particle size of 0.1-0.6 mm, 0.25 part of polypropylene explosion-proof fiber with the length of 5-10mm and the diameter of 15-35 mu m and 6 parts of aluminum silicate cement.
Taking a certain amount of the castable, adding water accounting for 8 percent of pouring amount by weight, uniformly stirring to obtain pouring slurry, pouring the pouring slurry into a mold for casting molding, demolding, maintaining, heating and baking to obtain the prefabricated member.
Comparative example 2
The embodiment provides a zirconium mullite composite silicon carbide castable for a waste incinerator, which comprises the following components: 15 parts of zirconium mullite particles with the particle size of 3-5 mm, 25 parts of silicon carbide particles with the particle size of 1-2mm, 20 parts of zirconium mullite powder with the particle size of 0.1-0.6 mm, 0.25 part of polypropylene explosion-proof fiber with the length of 5-10mm and the diameter of 15-35 mu m, 1.3 parts of alumina and 6 parts of aluminum silicate cement.
Taking a certain amount of the pouring material, adding 8 percent by weight of water into the pouring amount, uniformly stirring to obtain pouring slurry, pouring the pouring slurry into a mold for casting molding, demolding, maintaining, heating and baking to obtain the prefabricated member.
The preforms produced in example 1~3 and comparative examples 1 and 2 were tested for performance and the results are shown in table 1.
TABLE 1
As can be seen from table 1, in the examples provided by the present invention, there is a change in properties during the baking forming process, and after the baking conditions are changed from 1000 ℃x3 h to 1450 ℃x3 h, the compressive strength and the flexural strength of the product are significantly improved because the silica in the additive reacts with the alumina to produce mullite, the magnesia reacts with the alumina to produce magnesia alumina spinel, and the volume of the mullite and the magnesia alumina spinel expands during the production process, thereby filling the internal pores formed by the decomposition of the polypropylene explosion-proof fiber and the loss of the solvent, so that the compressive strength and the flexural strength are improved, while in the comparative examples, it can be seen that the change in the compressive strength and the flexural strength is not large after the baking temperature is increased, and in combination with the bulk density, the bulk density of example 1 is substantially equivalent to that of comparative examples 1 and 2, and therefore it can be judged that the mullite and the magnesium alumina spinel can expand toward the internal pores during the production process, so that the change in the external dimensions of the product is not caused, and thus the addition of the additive to the product is significantly reduced in the thermal resistance and the addition of the additive is hardly caused.
In summary, compared with the prior art, the mechanical strength of the product can be improved under the condition of baking at a higher temperature by applying the scheme of the invention, so that the product is better applied to the garbage incinerator (especially a flashboard part which is opened and closed frequently), and the pore-forming rate of the product is relatively lower under the action of the additive, so that the heat resistance and the corrosion resistance of the product can be improved, and the high-temperature environment and the corrosion environment of the garbage incinerator can be met.
Claims (10)
1. The zirconium-mullite composite silicon carbide castable for the garbage incinerator is characterized by comprising the following components in parts by weight: comprises coarse aggregate, medium aggregate, fine aggregate, additive, binder and explosion-proof fiber; the coarse aggregate comprises zirconium mullite particles with the particle size of 3-5 mm, the medium aggregate comprises silicon carbide particles with the particle size of 1-2mm, the fine aggregate comprises zirconium mullite powder with the particle size of 0.1-0.6 mm, and the additive comprises alumina powder, silica powder and silicon micropowder.
2. The zirconium mullite composite silicon carbide castable for the waste incinerator according to claim 1, characterized in that: the length of the explosion-proof fiber is 5-10mm, and the diameter of the explosion-proof fiber is 15-35 mu m.
3. The zirconium mullite composite silicon carbide castable for the waste incinerator according to claim 1, characterized in that: the zirconium dioxide content in the zirconium mullite grains and the zirconium mullite powder is 20-30%.
4. The zirconium mullite composite silicon carbide castable for the waste incinerator according to claim 1, characterized in that: the additive also comprises magnesium oxide powder.
5. The zirconium mullite composite silicon carbide castable for garbage incinerators according to claim 4, wherein: in the additive, by mass parts, alumina: silicon oxide: magnesium oxide = (2.5 to 2.7): 1: (0.1 to 0.2).
6. The zirconium mullite composite silicon carbide castable for the waste incinerator according to claim 1, characterized in that: the addition amount of the explosion-proof fiber is 0.3 to 0.5 percent of the sum of the coarse aggregate, the medium aggregate and the fine aggregate.
7. The zirconium mullite composite silicon carbide castable for garbage incinerators as claimed in claim 5, wherein: the addition amount of the additive is 3-6% of the sum of the coarse aggregate, the medium aggregate and the fine aggregate.
8. The zirconium mullite composite silicon carbide castable for the waste incinerator according to claim 1, characterized in that: the coarse aggregate comprises the following components in parts by mass: medium aggregate: fine aggregate =1: (1.8 to 2.3): (1.2 to 1.4).
9. The zirconium mullite composite silicon carbide castable for the waste incinerator according to claim 1, characterized in that: the composite material is prepared from the following raw materials in parts by mass: 15-20 parts of coarse aggregate, 25-35 parts of medium aggregate, 20-25 parts of fine aggregate, 0.2-0.5 part of explosion-proof fiber, 8978 parts of additive, 8978 parts of zxft 8978 parts of binder and 5-10 parts of binder.
10. A preform made by mixing the castable material of claim 1~9 with water to form a slurry and then casting.
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| CN202211646291.2A CN115819097A (en) | 2022-12-21 | 2022-12-21 | Zirconium-mullite composite silicon carbide castable for garbage incinerator and prefabricated part |
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| JP2002220290A (en) * | 2001-01-16 | 2002-08-09 | Kawasaki Refract Co Ltd | Castable refractory |
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| CN104311056A (en) * | 2014-10-08 | 2015-01-28 | 宁夏天纵泓光余热发电技术有限公司 | Mullite fiber refractory casting material |
| CN109987949A (en) * | 2019-03-25 | 2019-07-09 | 宜兴市泰科耐火材料有限公司 | Silicon carbide crusting resistant pouring material and preparation method thereof |
| CN111635220A (en) * | 2020-06-15 | 2020-09-08 | 武汉钢铁有限公司 | Refractory material for preventing slag entrapment of steel ladle, steel ladle slag entrapment prevention product and preparation method of steel ladle slag entrapment prevention product |
-
2022
- 2022-12-21 CN CN202211646291.2A patent/CN115819097A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002220290A (en) * | 2001-01-16 | 2002-08-09 | Kawasaki Refract Co Ltd | Castable refractory |
| CN103539473A (en) * | 2013-11-09 | 2014-01-29 | 宁夏天纵泓光余热发电技术有限公司 | Mullite refractory castable |
| CN104086191A (en) * | 2014-06-26 | 2014-10-08 | 浙江锦诚耐火材料有限公司 | Gunning mix for blast furnace tapping channel |
| CN104311056A (en) * | 2014-10-08 | 2015-01-28 | 宁夏天纵泓光余热发电技术有限公司 | Mullite fiber refractory casting material |
| CN109987949A (en) * | 2019-03-25 | 2019-07-09 | 宜兴市泰科耐火材料有限公司 | Silicon carbide crusting resistant pouring material and preparation method thereof |
| CN111635220A (en) * | 2020-06-15 | 2020-09-08 | 武汉钢铁有限公司 | Refractory material for preventing slag entrapment of steel ladle, steel ladle slag entrapment prevention product and preparation method of steel ladle slag entrapment prevention product |
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