CN113620719A - Castable for permanent layer of main iron runner of blast furnace - Google Patents
Castable for permanent layer of main iron runner of blast furnace Download PDFInfo
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- CN113620719A CN113620719A CN202010370893.4A CN202010370893A CN113620719A CN 113620719 A CN113620719 A CN 113620719A CN 202010370893 A CN202010370893 A CN 202010370893A CN 113620719 A CN113620719 A CN 113620719A
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- blast furnace
- main iron
- castable
- iron runner
- permanent layer
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 121
- 150000008301 phosphite esters Chemical class 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 5
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 5
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 22
- 229910052593 corundum Inorganic materials 0.000 claims description 17
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 15
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000010431 corundum Substances 0.000 claims description 10
- 239000011325 microbead Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000006229 carbon black Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000011449 brick Substances 0.000 description 14
- 238000009413 insulation Methods 0.000 description 13
- 239000004927 clay Substances 0.000 description 12
- 239000002893 slag Substances 0.000 description 12
- 239000011819 refractory material Substances 0.000 description 11
- 230000003628 erosive effect Effects 0.000 description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000004005 microsphere Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000503 Na-aluminosilicate Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000429 sodium aluminium silicate Substances 0.000 description 2
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical group [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004567 concrete Chemical group 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Products (AREA)
- Blast Furnaces (AREA)
Abstract
The invention discloses a castable for a permanent layer of a main iron runner of a blast furnace, which mainly solves the technical problems that the permanent layer of the main iron runner of the blast furnace is easy to wear iron, the service life is short and the use cost is high. The invention relates to a castable for a permanent layer of a main iron runner of a blast furnace, which comprises the following chemical components in percentage by weight: al (Al)2O3：46～56％，SiO2: 25-35%, CaO: 2-4%, SiC: 15-20%, C: 1-2% of phosphite ester, 0.5-1.0% of phosphite ester, and the sum of the weight percentages of all the components is 100%. The compressive strength of a blast furnace main iron runner permanent layer made of the castable prepared by the invention is more than or equal to 40MPa under the condition of 110 ℃ for 24 h; the heat conductivity coefficient of the permanent layer of the main iron channel of the blast furnace at 550 ℃ is 0.25-0.35W/m.k, the castable disclosed by the invention is low in cost, and the permanent layer of the main iron channel of the blast furnace, which is made of the castable, is long in service life.
Description
Technical Field
The invention relates to a refractory material for a main iron runner of a blast furnace, in particular to a castable for a permanent layer of the main iron runner of the blast furnace, belonging to the technical field of unshaped refractory materials for thermal equipment in the steel industry.
Background
The main iron runner of the blast furnace is an important facility in front of the blast furnace, and the main iron runner of the blast furnace has the function of realizing the separation of liquid slag and iron. The method is divided into an iron storage type and a non-iron storage type according to whether molten iron is stored in the groove when the molten iron is not discharged. The iron storage type main iron runner is widely applied because the temperature in the runner is stable and molten iron does not directly wash the refractory material at the bottom of the runner during tapping. Because the main iron runner stores high-temperature molten iron for a long time, and the lining of the main iron runner is washed and eroded by the iron slag for a long time, the working condition is very bad, and the structural design of the section of the main iron runner is particularly important in order to control the temperature of the supporting structure of the main iron runner within a reasonable range.
The section of the blast furnace main iron runner is divided into a forced cooling type and a heat insulation type according to different cooling modes, and the heat insulation type main iron runner mainly controls heat conduction by means of the thermal resistance of refractory materials between molten iron and a concrete structure, so that reasonable distribution of control temperature is realized.
The heat-insulating blast furnace main iron runner comprises a steel shell, a permanent layer and a working layer.
At present, a blast furnace main iron runner permanent layer is built by adopting heat insulation clay bricks, the general thickness is 200-350 mm, the main iron runner permanent layer mainly plays a heat insulation role, the heat insulation clay bricks have brick joints and low strength, the normal-temperature compressive strength of the general heat insulation clay bricks is 25MPa, and the heat conductivity coefficient is 0.75W/m.k, so that the main iron runner permanent layer cannot play an effective protection role, and iron penetration accidents are easy to occur.
The working layer of the main iron runner of the blast furnace is a casting layer and mainly uses Al2O3the-SiC-C refractory material is used as a working lining, is mainly prepared from corundum, silicon carbide, a carbon material, a bonding agent, a proper amount of additives and other raw materials, and mainly plays a role in resisting molten iron erosion and molten iron corrosion.
The Chinese patent application with the publication number of CN101613211A discloses a regenerated castable manufactured by using waste blast furnace main channel materials, which mainly uses the castable of a used blast furnace main channel material regeneration working layer, and the functions of molten iron erosion resistance and molten iron erosion resistance can meet the requirements, but the heat-insulating property is not the main purpose and can not meet the requirements.
The Chinese patent application with the publication number of CN101096312A discloses a low-cost and durable blast furnace main channel material, which utilizes asphalt as a carbon material and uses the used blast furnace main channel material as a raw material to realize low cost, and simultaneously, the material is used in a working layer, the molten iron erosion resistance and the molten iron erosion resistance can meet the requirements, but the heat insulation performance is not the main purpose, and the requirements cannot be met.
Disclosure of Invention
The invention aims to provide a castable for a permanent layer of a main iron runner of a blast furnace, which mainly solves the technical problems that the permanent layer of the main iron runner of the blast furnace is easy to wear iron, the service life is short and the use cost is high.
The technical scheme of the invention is that the castable for the permanent layer of the main iron runner of the blast furnace comprises the following chemical components in percentage by weight: al (Al)2O3：46～56％，SiO2: 25-35%, CaO: 2-4%, SiC: 15-20%, C: 1-2% of phosphite ester, 0.5-1.0% of phosphite ester, and the sum of the weight percentages of all the components is 100%.
A castable for a permanent layer of a main iron runner of a blast furnace comprises the following raw material components in percentage by weight: 50-59% of treated castable for a used main iron runner working layer, 15-20% of corundum, 15-25% of silicon carbide, 3-5% of pure calcium aluminate cement, 2-4% of microbeads, 1.0-2.0% of carbon black and 0.5-1.0% of phosphite ester, wherein the sum of the weight percentages of the raw material components is 100%.
The compressive strength of a blast furnace main iron runner permanent layer made of the castable prepared by the invention is more than or equal to 40MPa under the condition of 110 ℃ for 24 h; the heat conductivity coefficient of the permanent layer of the main iron runner of the blast furnace at 550 ℃ is 0.25-0.35W/m.k, the normal-temperature compressive strength and the heat insulation effect are far better than those of heat insulation clay bricks, and the permanent layer of the main iron runner of the blast furnace has better protection effect on a steel shell of the main iron runner of the blast furnace; under the condition of 110 ℃ for 24h, the compressive strength of the permanent layer of the main iron runner of the blast furnace made of the heat-insulating clay brick is 25MPa, and the heat conductivity coefficient of the permanent layer of the main iron runner of the blast furnace made of the heat-insulating clay brick at 550 ℃ is 0.75W/m.k.
The reason why the composition of the castable for the permanent layer of the main iron channel of the blast furnace according to the present invention is limited to the above range is as follows:
because the permanent layer and the working layer of the blast furnace main iron runner are both made of aluminum-silicon refractory materials, the castable for the permanent layer of the blast furnace main iron runner also mainly adopts aluminum-silicon substances so as to prevent the reaction of alkaline substances and acidic substances.
The material of the casting material contains a certain amount of Al2O3，Al2O3Is an oxide with strong anti-erosion capability to alkaline and acid slag systems, but has large expansion coefficient and poor spalling resistance, the matrix part is easy to be infiltrated and melted by slag, the aggregate is exposed and peeled to be melted and damaged, and the requirement of the refractory material for the permanent layer of the tapping channel can not be met, so the Al is completely used2O3Other materials are introduced. Al in the castable of the invention2O3Is prepared from the treated casting material and corundum for the working layer of the used main iron runner2O3The content is controlled to be 46-56%.
The castable for the used main iron runner working layer comprises Al2O3-SiC-C, wherein Al2O3More than or equal to 70 percent, and the total content of the sum of the mass percentages of SiC and C is more than or equal to 20 percent. The treatment process of the castable for the used main iron runner working layer comprises the following steps: firstly disintegrating the used main runner material, then removing large slag iron, crushing by using a jaw crusher, and finally carrying out magnetic separation and screening to obtain the treated castable for the used main runner working layer, wherein the grain diameter of the castable is 3.0-5.0 mm. The treated castable for the used main iron runner working layer is utilized, so that the recycling of the main runner waste is realized, the production and construction cost of the slag runner is reduced, and meanwhile, the castable is strong in field adaptability, good in oxidation resistance, strong in erosion resistance and high in safety.
Corundum is an oxide with strong erosion resistance to alkaline and acid slag systems, but corundum has large expansion coefficient and poor spalling resistance, and a matrix part is easy to be infiltrated and damaged by slag, so that aggregates are exposed, stripped and damaged, and the requirement of a refractory material for a tapping channel cannot be met. For this purpose, silicon carbide and carbon are introduced into the corundum matrix. According to the Al content of the material2O3The total requirement of the content is that the corundum is controlled to be 15-20 percent.
Silicon carbide: silicon carbide has been used as a primary raw material for refractory materials in severe slag erosion and spalling sites because of its high melting point, high hardness, high strength, low coefficient of thermal expansion, high thermal conductivity, stable chemical properties, and the like, which are not normally found in many oxides that are difficult to react with slag. The amount of silicon carbide added may depend on the conditions of use such as: the volume of the blast furnace and the requirements of the iron slag on different parts of the material property are adjusted, and the volume is set to be 15-25%.
Carbon black: has the characteristics of no wetting by slag, high heat conductivity, low expansion and the like. Therefore, the introduction of carbon can significantly improve the erosion resistance and thermal shock stability of the refractory material. However, the addition amount of the carbon black is not too much, too much carbon black is easy to oxidize, and the addition amount is 1-2% after tests.
Pure calcium aluminate cement: proper pure calcium aluminate cement is added into the castable, which is necessary for ensuring high green body strength, but is not beneficial to maintaining the anti-decrepitation and the strength after heating of the castable, and the adding amount is 3-5% after repeated tests.
Microbeads: in order to reduce the thermal conductivity of the material, the hollow microsphere is adopted, and the microsphere is sodium aluminosilicate (2 AlNaO)3SiO·H2O) is a global fine microbead with continuous particle size distribution and different particle sizes, the particle size adopted by the invention is less than or equal to 10 mu m, and the main chemical component of the microbead is Al for enhancing the strength of the material2O3In micro beads Al2O3The weight percentage content of the sodium silicate is 40-45%, and the forming process is that silicon dioxide, aluminum oxide and sodium hydroxide react to generate insoluble sodium aluminosilicate, as shown in the following reaction formula, 2SiO2+Al2O3+2NaOH＝Na2O·Al2O3·2SiO2·H2O, if the addition amount of the hollow microspheres is too small, the effect of reducing the heat conductivity coefficient cannot be achieved, if the addition amount is too much, the strength of the formed material cannot meet the requirement, and through years of research, the weight percentage content of the microspheres in the coating material is controlled to be 2-4 percent; in order to facilitate construction and ensure construction quality, the particle size of the microbeads is controlled to be less than or equal to 10 microns.
Phosphite ester: phosphite ester is an antioxidant which can prevent the refractory material from being oxidized, and the addition amount of the phosphite ester is controlled to be 0.5-1.0 percent
The method for preparing the permanent layer of the main iron runner of the blast furnace by using the castable comprises the following steps:
1) cleaning a steel shell of a main iron runner of a blast furnace;
2) installing a permanent layer pouring template of a main iron runner of the blast furnace;
3) preparing pouring slurry, adding water into the pouring material and stirring, wherein the added water accounts for 5-6% of the mass of the pouring material, the stirring time is 6-8 minutes, and the pouring slurry is obtained after uniform stirring;
4) pouring a permanent layer of a main iron runner of the blast furnace, pouring the pouring slurry onto the surface of a steel shell of the main iron runner of the blast furnace, controlling the thickness of the permanent layer to be 200-350 mm, and demolding after finishing pouring and maintaining for 18-24 hours;
5) and (3) baking the permanent layer of the main iron runner of the blast furnace according to a conventional baking system of the main iron runner of the blast furnace.
The castable is used for preparing the permanent layer of the main iron runner of the blast furnace, has no gap, has certain strength after being constructed, can effectively play a role in protection, has lower coefficient of thermal conductivity, and plays a better role in heat insulation.
The permanent layer of the main iron runner of the blast furnace made of the castable has the advantages of high strength, low heat conductivity coefficient, effective protection and heat insulation, and reduced purchasing cost due to the use of the used castable on the main runner.
Compared with the prior art, the invention has the following positive effects: 1. the permanent layer of the main iron runner of the blast furnace made of the castable thoroughly solves the potential safety hazard of iron penetration caused by brick joints of the permanent layer of the main iron runner of the blast furnace made of the existing heat-insulating clay bricks, plays a better role in protecting the steel shell of the main iron runner of the blast furnace, and prolongs the service life of the main iron runner of the blast furnace. 2. The castable provided by the invention adopts the castable for the working layer of the main iron runner of the used blast furnace as a main raw material, realizes the recycling of the used refractory, and reduces the manufacturing cost of the permanent layer of the main iron runner of the blast furnace. 3. The compressive strength of the permanent layer of the main iron runner of the blast furnace made of the castable is more than or equal to 40MPa under the condition of 110 ℃ for 24 hours; the heat conductivity coefficient of the permanent layer of the main iron runner of the blast furnace at 550 ℃ is 0.25-0.35W/m.k, the normal-temperature compressive strength and the heat insulation effect are far better than those of heat insulation clay bricks, and the permanent layer of the main iron runner of the blast furnace has better protection effect on a steel shell of the main iron runner of the blast furnace; under the condition of 110 ℃ for 24h, the compressive strength of the permanent layer of the main iron runner of the blast furnace made of the heat-insulating clay brick is 25MPa, and the heat conductivity coefficient of the permanent layer of the main iron runner of the blast furnace made of the heat-insulating clay brick at 550 ℃ is 0.75W/m.k.
Detailed Description
The present invention will be further described with reference to examples 1 to 5, which are shown in tables 1 and 2.
A castable for a permanent layer of a main iron runner of a blast furnace comprises the following chemical components in percentage by weight: al (Al)2O3：46～56％，SiO2: 25-35%, CaO: 2-4%, SiC: 15-20%, C: 1-2% of phosphite ester, 0.5-1.0% of phosphite ester, and the sum of the weight percentages of all the components is 100%.
A castable for a permanent layer of a main iron runner of a blast furnace comprises the following raw material components in percentage by weight: 50-59% of treated castable for a used main iron runner working layer, 15-20% of corundum, 15-25% of silicon carbide, 3-5% of pure calcium aluminate cement, 2-4% of microbeads, 1.0-2.0% of carbon black and 0.5-1.0% of phosphite ester, wherein the sum of the weight percentages of the raw material components is 100%.
Table 1 chemical composition of castable of examples of the present invention, unit: the weight percentage is energy.
| Chemical composition | Al2O3 | SiO2 | CaO | SiC | C | Phosphite esters |
| The invention | 46～56 | 25～35 | 2～4 | 15～20 | 1.0～2.0 | 0.5～1.0％ |
| Example 1 | 46 | 34 | 2 | 15 | 2 | 1 |
| Example 2 | 46 | 35 | 2 | 15.5 | 1 | 0.5 |
| Example 3 | 48 | 31 | 2 | 17 | 1 | 1 |
| Example 4 | 49.5 | 25 | 4 | 20 | 1 | 0.5 |
| Example 5 | 56 | 25 | 2 | 15 | 1 | 1 |
Table 2 raw material components of castable of examples of the present invention, unit: and (4) weight percentage.
The method for preparing the permanent layer of the main iron runner of the blast furnace by using the castable comprises the following steps:
1) cleaning a steel shell of a main iron runner of a blast furnace;
2) installing a permanent layer pouring template of a main iron runner of the blast furnace;
3) preparing pouring slurry, adding water into the pouring material and stirring, wherein the added water accounts for 5.5 percent of the mass of the pouring material, the stirring time is 7 minutes, and the pouring slurry is obtained after uniform stirring;
4) pouring a permanent layer of the main iron runner of the blast furnace, pouring the pouring slurry on the surface of the steel shell of the main iron runner of the blast furnace, controlling the thickness of the permanent layer to be 250mm, and demoulding after the pouring is finished and the maintenance is carried out for 24 hours;
5) and (3) baking the permanent layer of the main iron runner of the blast furnace according to a conventional baking system of the main iron runner of the blast furnace.
Examples 1-5 the castable was used to make permanent layers of a blast furnace main iron runner, the compressive strength of the permanent layers was 40MPa, 42MPa, 43MPa, 45MPa, 48MPa at 110 ℃ for 24 h; under the condition of 110 ℃ for 24h, the compressive strength of a permanent layer of a main iron runner of the blast furnace made of the heat-insulating clay brick is 25 MPa; the strength of the permanent layer of the main iron channel of the blast furnace prepared by the castable is obviously improved, and the service life of the permanent layer of the main iron channel of the blast furnace is prolonged.
Examples 1-5 the thermal conductivity at 550 ℃ of the permanent layer of the main iron runner of the blast furnace made of the castable was 0.25W/m.k, 0.27W/m.k, 0.30W/m.k, 0.33W/m.k, 0.35W/m.k, respectively, and the thermal conductivity at 550 ℃ of the permanent layer of the main iron runner of the blast furnace made of the heat-insulating clay brick was 0.75W/m.k; the heat-insulating property of the permanent layer of the main iron runner of the blast furnace, which is prepared from the castable, is obviously improved, and the service life of the permanent layer of the main iron runner of the blast furnace is prolonged.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (8)
1. A castable for a permanent layer of a main iron runner of a blast furnace is characterized by comprising the following chemical components in percentage by weight: al (Al)2O3：46～56％，SiO2: 25-35%, CaO: 2-4%, SiC: 15-20%, C: 1-2% of phosphite ester, 0.5-1.0% of phosphite ester, and the sum of the weight percentages of all the components is 100%.
2. The castable according to claim 1, wherein the castable is prepared from the raw materials of a treated castable for a used main iron runner working layer, corundum, silicon carbide, pure calcium aluminate cement, microbeads, carbon black and phosphite ester according to the composition of claim 1.
3. The castable for the permanent layer of the main iron channel of the blast furnace as claimed in claim 2, wherein the castable comprises the following raw material components in percentage by weight: 50-59% of treated castable for a used main iron runner working layer, 15-20% of corundum, 15-25% of silicon carbide, 3-5% of pure calcium aluminate cement, 2-4% of microbeads, 1.0-2.0% of carbon black and 0.5-1.0% of phosphite ester, wherein the sum of the weight percentages of the raw material components is 100%.
4. The castable for the permanent layer of the main iron runner of the blast furnace as claimed in claim 2, wherein the treated castable for the working layer of the main iron runner after use has a chemical composition of hundreds of weightThe ratio of the components is as follows: al (Al)2O3More than or equal to 70 percent, the total content of the sum of the weight percentages of SiC and C is more than or equal to 20 percent, and the sum of the weight percentages of all the components is 100 percent.
5. The castable for the permanent layer of the main iron runner of the blast furnace according to claim 2, wherein the grain size of the treated castable for the working layer of the main iron runner after use is 3.0-5.0 mm.
6. The castable for a permanent layer of a main iron runner of a blast furnace according to claim 2, wherein the particle size of the microbeads is 10 μm or less.
7. A preparation method of a permanent layer of a main iron runner of a blast furnace is characterized in that the castable of claim 1 is adopted, and the method comprises the following steps:
1) cleaning a steel shell of a main iron runner of a blast furnace;
2) installing a permanent layer pouring template of a main iron runner of the blast furnace;
3) preparing pouring slurry, adding water into the pouring material and stirring, wherein the added water accounts for 5-6% of the mass of the pouring material, the stirring time is 6-8 minutes, and the pouring slurry is obtained after uniform stirring;
4) pouring a permanent layer of a main iron runner of the blast furnace, pouring the pouring slurry onto the surface of a steel shell of the main iron runner of the blast furnace, controlling the thickness of the permanent layer to be 200-350 mm, and demolding after finishing pouring and maintaining for 18-24 hours;
5) and baking the permanent layer of the main iron runner of the blast furnace.
8. The method for preparing the permanent layer of the main iron runner of the blast furnace as claimed in claim 7, wherein the compressive strength of the permanent layer of the main iron runner of the blast furnace made of the castable is not less than 40MPa at 110 ℃ for 24 h; the heat conductivity coefficient of the permanent layer of the main iron runner of the blast furnace at 550 ℃ is 0.25-0.35W/m.k.
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| JP2000203953A (en) * | 1998-12-28 | 2000-07-25 | Harima Ceramic Co Ltd | Castable refractory for trough of blast furnace |
| CN101096312A (en) * | 2006-06-30 | 2008-01-02 | 宝山钢铁股份有限公司 | Low-cost durable blast furnace main channel material |
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| CN101613211A (en) * | 2009-07-28 | 2009-12-30 | 武汉钢铁(集团)公司 | A kind of regenerated castable material that utilizes discarded blast furnace main channel material to make |
| CN104140232A (en) * | 2013-05-07 | 2014-11-12 | 中国石化工程建设有限公司 | A 1350 DEG C grade low-iron thermally-insulating castable used for industrial furnaces and a preparing method thereof |
| CN105367094A (en) * | 2015-11-04 | 2016-03-02 | 长兴明天炉料有限公司 | Alumina-silica environment-friendly main channel castable |
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| JP2000203953A (en) * | 1998-12-28 | 2000-07-25 | Harima Ceramic Co Ltd | Castable refractory for trough of blast furnace |
| CN101096312A (en) * | 2006-06-30 | 2008-01-02 | 宝山钢铁股份有限公司 | Low-cost durable blast furnace main channel material |
| CN101555535A (en) * | 2009-05-15 | 2009-10-14 | 佘成明 | Single iron-port blast furnace tapping main channel and making technique thereof |
| CN101613211A (en) * | 2009-07-28 | 2009-12-30 | 武汉钢铁(集团)公司 | A kind of regenerated castable material that utilizes discarded blast furnace main channel material to make |
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