CN113754415A - Composite combined ferronickel rotary kiln castable and preparation method thereof - Google Patents
Composite combined ferronickel rotary kiln castable and preparation method thereof Download PDFInfo
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- CN113754415A CN113754415A CN202111054957.0A CN202111054957A CN113754415A CN 113754415 A CN113754415 A CN 113754415A CN 202111054957 A CN202111054957 A CN 202111054957A CN 113754415 A CN113754415 A CN 113754415A
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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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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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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
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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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
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
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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
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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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
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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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
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
- C04B2235/9615—Linear firing shrinkage
Abstract
The invention provides a composite combined ferronickel rotary kiln castable and a preparation method thereof. The castable comprises the following components in percentage by weight: 60-65% of alumina particles, 20-27% of alumina fine powder, 3-6% of silica micropowder, 1-4% of high-alumina cement, 2-5% of expanding agent, 0.1-0.5% of explosion-proof agent, 1-3% of steel fiber, 0.1-0.5% of water reducing agent and 8-12% of liquid silica sol. By adopting a silica sol and high-alumina cement composite combination mode to replace single cement combination or single silica sol combination, the castable with strong demolding strength and good high-temperature service performance can be obtained.
Description
Technical Field
The invention relates to the technical field of unshaped refractory materials, in particular to a composite combined ferronickel rotary kiln castable and a preparation method thereof.
Background
The rotary kiln refers to a rotary calcining kiln (commonly called a rotary kiln) which is used for producing materials in a rotary mode and calcining the materials. Its technical performance and operational conditions determine to a great extent the quality, yield and cost of the products of the enterprise. The damage of the refractory lining of the rotary kiln often affects the continuity of production and is one of the common equipment accidents. Therefore, the selection of the kiln lining is very important, and the refractory material lining which is resistant to corrosion and abrasion and has the characteristic of micro expansion at high temperature is selected for the rotary kiln with the kiln coating or the rotary kiln without the kiln coating. Preventing high-temperature flame airflow and harmful substances (CO and SO)2) The materials and the airflow directly damage the kiln body. The damage mechanism of the kiln lining can be divided into mechanical stress damage, thermal damage, chemical erosion damage and the like. In order to resist the thermal stress of the kiln lining caused by high temperature, high pressure, mechanical impact and temperature change, the lining body is prevented from cracking, peeling and the like.
Disclosure of Invention
In order to overcome the defects in the background art, the invention provides a composite combined ferronickel rotary kiln castable and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the composite bonded ferronickel rotary kiln castable is bonded by high alumina cement and liquid silica sol.
The castable comprises the following components in percentage by weight: 60-65% of alumina particles, 20-27% of alumina fine powder, 3-6% of silica micropowder, 1-4% of high-alumina cement, 2-5% of expanding agent, 0.1-0.5% of explosion-proof agent, 1-3% of steel fiber, 0.1-0.5% of water reducing agent and 8-12% of liquid silica sol.
Furthermore, the silica sol is a liquid sol with the particle size of 5-100 nm.
Further, the alumina particlesThe physical and chemical performance requirements are as follows: al (Al)2O3≥75%、TiO2≥3%、CaO≤0.2%、Fe2O3≤1.7%、SiO2≤18%。
Further, the particle size of the alumina particles is required to be as follows: 8-5 mm, 5-3 mm, 3-1 mm, 1-0 mm.
Furthermore, the granularity of the alumina fine powder is 200 meshes, and the requirement of physical and chemical properties is Al2O3≥85%、TiO2≥2%、CaO≤0.2%、Fe2O3≤1.7%、SiO2≤16%。
Further, the physical and chemical performance requirements of the silicon micropowder are as follows: SiO 22≥92%,Fe2O3≤0.1%。
Further, the high-alumina cement has the following physical and chemical performance requirements: al (Al)2O3≥70%、TiO2≥2%、CaO≤28%、Fe2O3≤0.4%、SiO2≤0.3%。
Further, the expanding agent is quartz powder with the granularity of 200 meshes, and the requirements on the physical and chemical properties are as follows: SiO 22≥99%。
Further, the explosion-proof agent is organic fiber with the melting point of 340 ℃ and the length of 5 mm.
Further, the water reducing agent is sodium tripolyphosphate.
The preparation method of the composite combined ferronickel rotary kiln castable comprises the following steps:
1) the mixture prepared according to the proportion is stirred for 2 minutes, then 8 percent of liquid silica sol is added, and then the mixture is stirred for 3 minutes;
2) molding the mixture into a sample block with a set size by vibration casting, and maintaining for 24 hours;
3) baking at 110 ℃ for 24 h;
4) firing at 1350 ℃ for 3h in a high-temperature furnace.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a composite combination mode of silica sol and high-alumina cement is adopted to replace single cement combination or single silica sol combination, so that the castable which has strong demolding strength and good high-temperature service performance can be obtained.
Detailed Description
The following describes in detail specific embodiments of the present invention.
The composite combined ferronickel rotary kiln castable adopts a silica sol and high-alumina cement composite combination mode to replace single cement combination or single silica sol combination. The weight percentages of the components are as follows: 60-65% of alumina particles, 20-27% of alumina fine powder, 3-6% of silica powder, 1-4% of high-alumina cement, 2-5% of expanding agent, 0.1-0.5% of explosion-proof agent, 1-3% of steel fiber, 0.1-0.5% of water reducing agent and 8-12% of liquid silica sol.
The bauxite particles have the following physical and chemical property requirements: al (Al)2O3≥75%、TiO2≥3%、CaO≤0.2%、Fe2O3≤1.7%、SiO2≤18%。
The bauxite particle size requirement is as follows: 8-5 mm, 5-3 mm, 3-1 mm, 1-0 mm.
The granularity of the alumina fine powder is 200 meshes, and the requirement of physical and chemical properties is Al2O3≥85%、TiO2≥2%、CaO≤0.2%、Fe2O3≤1.7%、SiO2≤16%。
The physical and chemical performance requirements of the silicon micro powder are as follows: SiO 22≥92%,Fe2O3≤0.1%。
The high-alumina cement has the following physical and chemical performance requirements: al (Al)2O3≥70%、TiO2≥2%、CaO≤28%、Fe2O3≤0.4%、SiO2≤0.3%。
The expanding agent is quartz powder with the granularity of 200 meshes, and the requirements on the physical and chemical properties are as follows: SiO 22≥99%。
The explosion-proof agent is organic fiber with the melting point of 340 ℃ and the length of 5 mm.
The silica sol is a liquid sol with the particle size of 5-100 nm.
The water reducing agent is sodium tripolyphosphate.
The preparation method of the composite combined ferronickel rotary kiln castable comprises the following steps:
1) the mixture prepared by the high-alumina cement according to the proportion is stirred for 2 minutes, then 8 percent of liquid silica sol is added, and then the mixture is stirred for 3 minutes;
2) molding the mixture into a sample block with a set size by vibration casting, and maintaining for 24 hours;
3) baking at 110 ℃ for 24 h;
4) firing at 1350 ℃ for 3h in a high-temperature furnace.
The specific embodiment is as follows:
example 1
The invention relates to a composite combined ferronickel rotary kiln castable, which comprises the following components in percentage by weight: alumina particles are 8-5 mm, 5-3 mm, 3-1 mm and 1-0 mm, alumina fine powder is 200 meshes, and quartz powder is 200 meshes.
The proportion (weight percentage) of each component is as follows: 63% of alumina particles, 27% of fine alumina powder, 1% of high-alumina cement, 5% of fine silica powder, 3% of quartz powder, 0.1% of organic fibers, 1.5% of steel fibers, 0.2% of a water reducing agent and 8% of liquid silica sol.
The mixture prepared according to the proportion is stirred for 2 minutes, 8 percent of liquid silica sol is added and then stirred for 3 minutes, the mixture is molded into a sample block of 40mm multiplied by 160mm by vibration casting, the sample block is maintained for 24 hours, the sample block is baked for 110 ℃ multiplied by 24 hours and is baked for 1350 ℃ multiplied by 3 hours in a high-temperature furnace, and the detection result is shown in the table I:
watch 1
Example 2
The invention relates to a composite combined ferronickel rotary kiln castable, which comprises the following components in percentage by weight: alumina particles are 8-5 mm, 5-3 mm, 3-1 mm and 1-0 mm, alumina fine powder is 200 meshes, and quartz powder is 200 meshes.
The proportion (weight percentage) of each component is as follows: 64 percent of alumina particles, 24 percent of alumina fine powder, 2 percent of high alumina cement, 5 percent of silicon powder, 4 percent of quartz powder, 0.1 percent of organic fiber, 1.5 percent of steel fiber, 0.2 percent of water reducing agent and 10 percent of liquid silica sol.
The mixture prepared according to the proportion is stirred for 2 minutes, 10 percent of liquid silica sol is added and then stirred for 3 minutes, the mixture is molded into a sample block with the size of 40mm multiplied by 160mm by vibration casting, the sample block is maintained for 24 hours, the sample block is baked for 110 ℃ multiplied by 24 hours and is baked for 1350 ℃ multiplied by 3 hours in a high-temperature furnace, and the detection result is shown in the second table
Watch two
Bulk density after baking at 110 ℃ for 24h | 2.68g/cm3 |
Cold bending strength at 110 deg.c for 24 hr | 7.8MPa |
Cold state compression strength at 110 deg.c for 24 hr | 35.1MPa |
Cold bending strength at 1350 deg.C for 3 hr after burning | 12.7MPa |
Cold state compression strength after 1350 deg.C x 3h burning | 121.2MPa |
Permanent line change rate after 1350 ℃ multiplied by 3h burning | +0.3% |
Example 3
The invention relates to a composite combined ferronickel rotary kiln castable, which comprises the following components in percentage by weight: alumina particles are 8-5 mm, 5-3 mm, 3-1 mm and 1-0 mm, alumina fine powder is 200 meshes, and quartz powder is 200 meshes.
The proportion (weight percentage) of each component is as follows: 65% of alumina particles, 21% of fine alumina powder, 3% of high-alumina cement, 5% of fine silica powder, 5% of quartz powder, 0.1% of organic fiber, 1.5% of steel fiber, 0.2% of water reducing agent and 12% of liquid silica sol.
The mixture prepared according to the proportion is stirred for 2 minutes, 12 percent of liquid silica sol is added and then stirred for 3 minutes, the mixture is molded into a sample block with the size of 40mm multiplied by 160mm by vibration casting, the sample block is maintained for 24 hours, the sample block is baked for 110 ℃ multiplied by 24 hours and is baked for 1350 ℃ multiplied by 3 hours in a high-temperature furnace, and the detection result is shown in table III
Watch III
Bulk density after baking at 110 ℃ for 24h | 2.7g/cm3 |
Cold bending strength at 110 deg.c for 24 hr | 8.3MPa |
Cold state compression strength at 110 deg.c for 24 hr | 40.3MPa |
Cold bending strength at 1350 deg.C for 3 hr after burning | 15.2MPa |
Cold state compression strength after 1350 deg.C x 3h burning | 100.8MPa |
Permanent line change rate after 1350 ℃ multiplied by 3h burning | +0.5% |
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (10)
1. The composite bonded ferronickel rotary kiln castable is characterized in that the bonding mode of the castable is a composite bonding mode of high-alumina cement and liquid silica sol.
2. The composite bonded ferronickel rotary kiln castable according to claim 1, wherein the castable comprises the following components in percentage by weight: 60-65% of alumina particles, 20-27% of alumina fine powder, 3-6% of silica micropowder, 1-4% of high-alumina cement, 2-5% of expanding agent, 0.1-0.5% of explosion-proof agent, 1-3% of steel fiber, 0.1-0.5% of water reducing agent and 8-12% of liquid silica sol.
3. The composite bonded ferronickel rotary kiln castable material according to claim 1, wherein the silica sol is a liquid sol with a particle size of 5-100 nm.
4. The composite bonded ferronickel rotary kiln castable material according to claim 2, wherein the bauxite particles have physical and chemical property requirements of: al (Al)2O3≥75%、TiO2≥3%、CaO≤0.2%、Fe2O3≤1.7%、SiO2≤18%。
5. The composite bonded ferronickel rotary kiln castable material according to claim 2, wherein the bauxite grain size requirement is as follows: 8-5 mm, 5-3 mm, 3-1 mm, 1-0 mm.
6. The composite bonded ferronickel rotary kiln castable according to claim 2, wherein the alumina fine powder has a particle size of 200 meshes and physical and chemical performance requirements of Al2O3≥85%、TiO2≥2%、CaO≤0.2%、Fe2O3≤1.7%、SiO2≤16%。
7. The composite bonded ferronickel rotary kiln castable according to claim 2, wherein the fine silica powder has physical and chemical performance requirements of: SiO 22≥92%,Fe2O3≤0.1%。
8. The composite bonded ferronickel rotary kiln castable material according to claim 2, wherein the high alumina cement has physical and chemical performance requirements of: al (Al)2O3≥70%、TiO2≥2%、CaO≤28%、Fe2O3≤0.4%、SiO2≤0.3%。
9. The composite bonded ferronickel rotary kiln castable according to claim 2, wherein the expanding agent is quartz powder with a particle size of 200 meshes, and the physical and chemical performance requirements are as follows: SiO 22≥99%。
10. The method for preparing the composite bonded ferronickel rotary kiln castable according to claim 1, characterized by comprising the following steps:
1) the mixture prepared according to the proportion is stirred for 2 minutes, then 8 percent of liquid silica sol is added, and then the mixture is stirred for 3 minutes;
2) molding the mixture into a sample block with a set size by vibration casting, and maintaining for 24 hours;
3) baking at 110 ℃ for 24 h;
4) firing at 1350 ℃ for 3h in a high-temperature furnace.
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Citations (6)
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US4244745A (en) * | 1978-06-22 | 1981-01-13 | Hoganas Ab | High-strength refractory casting compound for the manufacture of monolithic linings |
CN102351547A (en) * | 2011-07-06 | 2012-02-15 | 马鞍山市泰来冶金炉料有限责任公司 | High strength high temperature resistance semi-lightweight high alumina castable and its preparation method |
CN102491770A (en) * | 2011-12-06 | 2012-06-13 | 安徽瑞泰新材料科技有限公司 | Wear-resisting castable refractory |
CN102491768A (en) * | 2011-12-06 | 2012-06-13 | 安徽瑞泰新材料科技有限公司 | Composite bonding wear-resistant castable refractory |
CN102633513A (en) * | 2012-05-08 | 2012-08-15 | 中国钢研科技集团有限公司 | Fast-baking explosion proof type refractory castable for blast furnace iron runner |
CN113149675A (en) * | 2021-06-01 | 2021-07-23 | 河南玉和新型节能建材有限公司 | Low-cement refractory castable for pumping construction |
-
2021
- 2021-09-09 CN CN202111054957.0A patent/CN113754415A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4244745A (en) * | 1978-06-22 | 1981-01-13 | Hoganas Ab | High-strength refractory casting compound for the manufacture of monolithic linings |
CN102351547A (en) * | 2011-07-06 | 2012-02-15 | 马鞍山市泰来冶金炉料有限责任公司 | High strength high temperature resistance semi-lightweight high alumina castable and its preparation method |
CN102491770A (en) * | 2011-12-06 | 2012-06-13 | 安徽瑞泰新材料科技有限公司 | Wear-resisting castable refractory |
CN102491768A (en) * | 2011-12-06 | 2012-06-13 | 安徽瑞泰新材料科技有限公司 | Composite bonding wear-resistant castable refractory |
CN102633513A (en) * | 2012-05-08 | 2012-08-15 | 中国钢研科技集团有限公司 | Fast-baking explosion proof type refractory castable for blast furnace iron runner |
CN113149675A (en) * | 2021-06-01 | 2021-07-23 | 河南玉和新型节能建材有限公司 | Low-cement refractory castable for pumping construction |
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