CN116639963A - Refractory castable for blast furnace cast house iron runner and preparation method thereof - Google Patents

Refractory castable for blast furnace cast house iron runner and preparation method thereof Download PDF

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Publication number
CN116639963A
CN116639963A CN202310742200.3A CN202310742200A CN116639963A CN 116639963 A CN116639963 A CN 116639963A CN 202310742200 A CN202310742200 A CN 202310742200A CN 116639963 A CN116639963 A CN 116639963A
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parts
powder
blast furnace
castable
carboresp
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张志成
佘亚锋
佘凤娅
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Changxing Mingtian Furnace Material Co ltd
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Changxing Mingtian Furnace Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—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
    • C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • 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
    • 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
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/428—Silicon
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
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  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

The application discloses a refractory castable for a blast furnace cast house iron runner and a preparation method thereof, wherein the refractory castable for the blast furnace cast house iron runner comprises the following components: 45-55 parts of fused brown corundum; 15-25 parts of silicon carbide; 10-15 parts of composite micro powder; 2-5 parts of Secar71 high alumina cement; 2-4 parts of metal silicon powder; the high-temperature asphalt powder with the mass fraction of 1-3% and the carboresP with the mass fraction of 0.5-1.5% are additionally added as the composite carbon source, so that the problems that carbon in the carbon-containing refractory material in the prior art is easily oxidized, the thermal shock resistance and corrosion resistance of the castable are reduced, the castable of the tapping channel is peeled off, and the service life of the tapping channel of the blast furnace is reduced are solved.

Description

Refractory castable for blast furnace cast house iron runner and preparation method thereof
Technical Field
The application relates to the field of metal materials, in particular to a refractory castable for a blast furnace cast house iron runner and a preparation method thereof.
Background
In a blast furnace iron making system, the service life of the casting material of the blast furnace tapping channel is prolonged, so that the iron making cost can be effectively reduced, and the production efficiency can be improved. It is therefore one of the basic and key refractory materials in ironmaking processes. Since the tapping runners are frequently subjected to mechanical erosion and corrosion by high temperature molten iron and slag, the tapping runner castable must have excellent thermal shock resistance and slag resistance.
The Al2O3-SiC-C castable has the advantages of good erosion resistance, thermal shock resistance and the like, and is a common choice for the working lining of the blast furnace tapping channel at home and abroad at present. The embodiment of the application of application number CN201810306950.5 provides an erosion-resistant blast furnace iron runner self-flowing castable and a preparation method thereof, wherein the castable comprises: 40-60 parts of brown corundum particles, 10-20 parts of white corundum particles, 10-15 parts of silicon carbide powder, 3-5 parts of silicon micropowder, 3-5 parts of spherical asphalt, 5-7 parts of activated alumina micropowder, 1-2 parts of an additive, 0.5-1 part of an OP emulsifier and 3.5-4.2 parts of water. According to the application, the OP emulsifier is used for preparing the Al2O3-SiC-C iron runner self-flowing castable, so that the water adding amount of the iron runner is obviously reduced, the compactness of the material is improved, the slag erosion resistance of the iron runner is enhanced, the service life of the iron runner is prolonged, and the one-time iron passing amount of a blast furnace is improved. The application patent of application number 201811081169.9 provides a preparation method of a blast furnace tapping channel refractory castable for a large-scale blast furnace tapping channel. The high-quality high-alumina bauxite (Al 2O3 is more than or equal to 88%), fused brown alumina, fused white corundum and 97 silicon carbide are used as main raw materials, the high-alumina bauxite and the fused brown alumina are composed of certain grain composition, the fused white corundum powder, calcined alumina powder, 95 silica micropowder, spherical asphalt, metal silica powder and pure calcium aluminate cement are used as matrixes, and a proper amount of explosion-proof agent and efficient dispersing agent are added to prepare the high-quality high-alumina bauxite. In the Al2O3-SiC-C castable, matrix carbon can react with simple substance silicon to generate silicon carbide whiskers with high strength, but carbon in the carbon-containing refractory material is extremely easy to oxidize, so that the thermal shock resistance and corrosion resistance of the castable are reduced, the castable of the tapping channel is peeled off, and the service life of the tapping channel of the blast furnace is reduced.
Disclosure of Invention
The application provides a refractory castable for a blast furnace cast house iron runner and a preparation method thereof, which solve the problems that carbon in a carbon-containing refractory material is easy to oxidize, the thermal shock resistance and corrosion resistance of the castable are reduced, the castable of the iron runner is peeled off, and the service life of the blast furnace iron runner is reduced in the prior art.
In order to solve the technical problem, the application provides the following technical scheme:
the refractory castable for the blast furnace cast house iron runner comprises the following components:
45-55 parts of fused brown corundum;
15-25 parts of silicon carbide;
10-15 parts of composite micro powder;
2-5 parts of Secar71 high alumina cement;
2-4 parts of metal silicon powder;
adding high-temperature asphalt powder with the mass fraction of 1-3% and carboresP with the mass fraction of 0.5-1.5% into the raw materials as a composite carbon source.
Preferably, the composite micro powder is a mixture of Al2O3 micro powder and silicon micro powder.
Preferably, the refractory castable for the blast furnace cast house iron runner comprises the following components:
45-55 parts of fused brown corundum;
15-25 parts of silicon carbide;
10-15 parts of composite micro powder;
2-5 parts of Secar71 high alumina cement;
2-4 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% and carboresP with the mass fraction of 1% into the raw materials as a composite carbon source.
Preferably, the refractory castable for the blast furnace cast house iron runner comprises the following components:
55 parts of electric smelting brown corundum;
20 parts of silicon carbide;
12 parts of composite micro powder;
3 parts of Secar71 high alumina cement;
3 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% and carboresP with the mass fraction of 1% into the raw materials as a composite carbon source.
Preferably, the Al2O3 micro powder is Al2O3 micro powder with the granularity D50 less than 1.8 mu m, and the silicon micro powder is silicon micro powder with the granularity D50 less than 1.7 mu m.
Preferably, the weight ratio of the Al2O3 micro powder to the silicon micro powder is 1:1.
The scheme also provides a preparation method of the refractory castable for the blast furnace cast house iron runner, which comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with CarboresP and high-temperature asphalt powder;
(3) Adding the same amount of water for wet mixing; stirring the materials uniformly, vibrating and forming on a vibrating table to prepare a strip sample, curing by a normal temperature belt die, demolding, drying and baking to obtain the finished product.
Compared with the prior art, the application has the following advantages:
the brown corundum matrix castable is prepared by taking 2% of high-temperature asphalt powder and 1% of carboresP as a composite carbon source, and industrial tests are carried out in a blast furnace (the blast furnace capacity is 1080 cubic, the main ditch to small pit length is 15m, the slag ditch is 11m, the material consumption is 65t, the next time of sleeve disassembly is carried out, the total use is 123 days, the average iron flux is more than 17.9 ten thousand t under the condition of once repair, the comprehensive refractory ton iron consumption is low, and the economic benefit is obvious.
The method is used for the blast furnace tapping channel, effectively improves the slag iron erosion resistance, steadily improves the service life, reduces the ton iron cost consumption and effectively improves the comprehensive benefit. The product is used for blast furnace tapping channel, and has the characteristics of good construction performance, good slag and iron erosion resistance, high thermal shock stability, good environmental protection performance and the like.
As the high-temperature asphalt powder and the carboresP are used as the amorphous carbon with higher carbon residue, the composite carbon source has the advantages of small granularity, regular shape, high reactivity and the like, and the ceramic phase and the low melting phase formed at high temperature are introduced as the composite carbon source, so that the castable has good thermal shock property, small high-temperature creep deformation and difficult wetting with the iron slag.
The special coarse powder fine grinding device for producing the iron runner castable is adopted for products, so that the mixing uniformity is realized, the flow property of the castable is improved, the setting time is effectively controlled, the construction and demolding time of the castable is facilitated to be regulated, and the special production technology of the product is formed.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a graph showing the flow properties of samples of the present application containing different levels of high temperature bitumen powder;
FIG. 2 (a) is the bulk density of samples containing different levels of high temperature bitumen powder; FIG. 2 (b) shows the apparent porosity of samples containing different amounts of high temperature bitumen powder;
FIG. 3 is a graph showing the cold compressive strength of samples containing different amounts of high temperature asphalt powder;
FIG. 4 is a graph showing the high temperature flexural strength of samples containing different amounts of high temperature asphalt powder;
FIG. 5 shows the post-bake line change rate for samples containing varying amounts of carboresP;
FIG. 6 shows the cold compressive strength of samples containing varying amounts of carboresP;
FIG. 7 shows oxidation resistance of samples containing varying amounts of carboresP;
FIG. 8 shows the high temperature flexural strength of samples containing varying amounts of carboresP;
FIG. 9 is a high temperature fracture resistant microstructure of a carboresP-free sample;
FIG. 10 shows the high temperature fracture resistance microstructure of a sample with 1% carboresP added.
Detailed Description
The present application will be described in further detail with reference to the following examples, for the purpose of making the objects, technical solutions and advantages of the present application more apparent, and the description thereof is merely illustrative of the present application and not intended to be limiting.
Example 1
The casting material is prepared from the following raw materials in percentage by weight: 55 parts of electric smelting brown corundum;
15 parts of silicon carbide;
10 parts of composite micro powder;
2 parts of Secar71 high alumina cement;
2 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 1% of the total amount of the raw materials into the mixture to serve as a composite carbon source.
The preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with high-temperature asphalt powder for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Example 2
The casting material is prepared from the following raw materials in percentage by weight: 50 parts of fused brown corundum;
20 parts of silicon carbide;
15 parts of composite micro powder;
5 parts of Secar71 high alumina cement;
4 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% of the total amount of the raw materials into the mixture to serve as a composite carbon source.
The preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with high-temperature asphalt powder for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Example 3
The casting material is prepared from the following raw materials in percentage by weight: 50 parts of fused brown corundum;
20 parts of silicon carbide;
15 parts of composite micro powder;
5 parts of Secar71 high alumina cement;
4 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 3% of the total amount of the raw materials into the mixture to serve as a composite carbon source.
The preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with high-temperature asphalt powder for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Comparative example 1
The casting material is prepared from the following raw materials in percentage by weight: 55 parts of electric smelting brown corundum;
20 parts of silicon carbide;
12 parts of composite micro powder;
3 parts of Secar71 high alumina cement;
3 parts of metal silicon powder;
the preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Example 4
The casting material is prepared from the following raw materials in percentage by weight: 45 parts of fused brown corundum;
20 parts of silicon carbide;
12 parts of composite micro powder;
3 parts of Secar71 high alumina cement;
3 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% and 0.5% of carboresP as a composite carbon source.
The preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with CarboresP and high-temperature asphalt powder for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Example 5
The casting material is prepared from the following raw materials in percentage by weight: 45 parts of fused brown corundum;
20 parts of silicon carbide;
12 parts of composite micro powder;
3 parts of Secar71 high alumina cement;
3 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% and carboresP with the mass fraction of 1% into the raw materials as a composite carbon source.
The preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with CarboresP and high-temperature asphalt powder for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Example 6
The casting material is prepared from the following raw materials in percentage by weight: 45 parts of fused brown corundum;
20 parts of silicon carbide;
12 parts of composite micro powder;
3 parts of Secar71 high alumina cement;
3 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% and CarboresP with the mass fraction of 1.5% into the raw materials as a composite carbon source.
The preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with CarboresP and high-temperature asphalt powder for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Example 2
The casting material is prepared from the following raw materials in percentage by weight: 45 parts of fused brown corundum;
20 parts of silicon carbide;
12 parts of composite micro powder;
3 parts of Secar71 high alumina cement;
3 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% of the total amount of the raw materials into the mixture to serve as a composite carbon source.
The preparation method of the refractory castable for the blast furnace cast house iron runner comprises the following steps:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with CarboresP and high-temperature asphalt powder for 60s;
the same amount of water (meeting the construction requirement as a standard) is added for wet mixing for 120s. Uniformly stirring the materials, vibrating and forming on a vibrating table to obtain a strip sample with the size of 40mm multiplied by 160mm, curing for 24 hours by a normal temperature belt, demolding, putting into a constant temperature oven with 110 ℃ for drying for 24 hours, heating to 1000 ℃ and 1500 ℃ respectively in an air atmosphere, preserving heat for 3 hours, and naturally cooling to room temperature along with a furnace.
Firstly, the influence of the addition amount of the high-temperature asphalt powder on the normal-temperature physical properties of the castable is examined.
Under the same water adding amount, the change of the flow value along with the adding amount of the high-temperature asphalt powder is shown in figure 1. As can be seen from fig. 1, the fluidity of the castable becomes good and then bad with the increase of the high temperature asphalt powder, and when the high temperature asphalt powder is added more than 2%, the fluidity becomes bad. The analysis is mainly due to the fact that the high-temperature asphalt powder is good in dispersibility, fine in granularity and small in addition amount, air holes can be filled, the water consumption of casting materials is reduced, and the flow property is improved; when the amount added is further increased, the polymer is released outside the pores, and the fluidity is deteriorated.
The change of the volume density and apparent porosity of the samples treated at different temperatures with the addition of high-temperature asphalt powder is shown in FIG. 2. From fig. 2 (a), it can be seen that the volume density of the castable material after being treated for 110 ℃ x 3h, 1000 ℃ x 3h and 1500 ℃ x 3h all shows a tendency of increasing and then decreasing, and the castable material takes a maximum value when the high-temperature asphalt powder is added with 2%; as can be seen from FIG. 2 (b), the apparent porosity of the samples after low, medium and high temperature treatment tended to decrease and then increase, and the minimum value was obtained when 2% of the high temperature asphalt powder was added. The reason is that: firstly, air holes are filled with the increase of the addition amount of high-temperature asphalt powder, the structure is compact, sintering is promoted, and the volume density of a sample is increased; secondly, the high-temperature asphalt powder replaces white corundum powder with high density, so that the volume density of the castable is reduced; meanwhile, the high-temperature asphalt powder is excessively introduced, the flow value of the castable is reduced, the structural compactness is reduced, the volume density is reduced, and the apparent porosity is increased.
The change of the normal temperature compressive strength of the samples after heat treatment at different temperatures along with the addition amount of the high-temperature asphalt powder is shown in figure 3. As can be seen from fig. 3: the normal-temperature compressive strength of the sample after being dried at 110 ℃ is not obviously changed along with the increase of the addition amount of the high-temperature asphalt powder; the normal temperature compressive strength of the sample after burning at 1000 ℃ and 1500 ℃ shows a tendency of increasing and decreasing, and is maximum when the high temperature asphalt powder is added with 2%. The high-temperature asphalt powder is amorphous carbon, and the proper addition amount can be well dispersed in the castable, so that the pores are filled, and densification and sintering of the product are promoted.
The effect of high temperature asphalt addition on the high temperature flexural strength of the castable is shown in figure 4. As can be seen from fig. 4, as the amount of high-temperature asphalt powder added increases, the high-temperature flexural strength of the test specimen increases, and when the amount of high-temperature asphalt powder added exceeds 2%, the strength increases little. This is associated with green densification and good mullite crystal phase formation at high temperatures and is beneficial for improving the high temperature flexural strength of the castable.
The results show that the flow property, the volume density and the strength of the castable can be improved by adding different amounts of high-temperature asphalt powder into the iron runner castable, and the castable has the best comprehensive performance when the addition amount is 2%. Therefore, the optimal adding mass fraction of the high-temperature asphalt powder in the product is 2%.
Secondly, the influence of the determined addition of the carboresP addition on the normal-temperature physical properties of the castable is examined.
The change rate of the sample line after burning at 1000℃and 1500℃is shown in FIG. 5 as a function of the amount of carboresP added. From FIG. 5, it can be seen thatIt can be seen that: after the castable is burnt for 1000 ℃ multiplied by 3 hours and 1500 ℃ multiplied by 3 hours, the linear change rate is positive, and the samples are all expanded; with the increase of the addition amount of CarboresP, the linear expansion rate of the sample after burning at 1000 ℃ is gradually increased, and the reason is analyzed: c and Si react in situ at 800-1000 ℃ to generate SiC primary crystal to generate expansion. As the addition amount of carboresP increases, the silicon carbide generated by the reaction increases, and the expansion amount correspondingly increases. The linear expansion rate of the sample after being burned at 1500 ℃ shows a change trend of increasing and then decreasing, and the linear change rate is the largest when the CarboresP is added with 1 percent. The increase in linear expansion coefficient in the section where CarboresP is added in an amount of 0 to 1% is associated with both the generation of SiC and Al 2 O 3 With SiO 2 In connection with the mullite reaction, a volume expansion occurs; the reason why the linear expansion coefficient decreases at the CarboresP addition amount of 1.5% is related to the decrease in structural compactness.
The change of the normal temperature compressive strength of the sample with the addition amount of CarborasP after heat treatment at different temperatures is shown in fig. 6. As can be seen from fig. 6: with the increase of the addition amount of the carborasP, the normal-temperature compressive strength of the sample at 110 ℃ is not obviously changed; the room temperature compressive strength of the samples after 1000 ℃ and 1500 ℃ burn showed a tendency to increase and decrease, and was maximum at 1% CarborasP addition. The pouring strength after drying is mainly derived from the combination of cement and composite micro powder in a matrix, and the change of the flow property of the castable is caused by the increase of carboresP, so that the volume density of the castable is influenced; the strength of the casting material after firing is mainly controlled by the quantity of ceramic phases and low-melting phases formed by the sample at high temperature, carboresP contains low-melting-point substances, when excessive CarboresP is added, the sample can generate more low-melting-point phases at high temperature, and residual carbon is oxidized at high temperature to loosen the structure of the sample, so that the strength is affected. The analysis shows that the strength of the castable after treatment at each temperature is best when the addition amount of CarboresP is 1%.
The profile of the section (40 mm. Times.40 mm) of the sample after 1000 ℃ for 3h and 1500 ℃ for 3h is shown in FIG. 7. As can be seen from FIG. 7, the oxidation degree at 1500℃is less than that at 1000℃and is mainly due to the formation of a denser oxide film on the surface of the sample after 1500℃treatment, which alleviates the oxidation degree. Wherein the antioxidant property of the sample is equivalent when the carborasP addition amount is 1% and 1.5%. This is mainly because CarborasP is carbonized step by step at high temperature, and its ceramic volatiles permeate into the voids of the material to block the pores, so adding a proper amount of CarborasP can improve the compactness and oxidation resistance of the iron runner castable.
The effect of CarboresP addition on the high temperature flexural strength of the castable is shown in figure 8. As shown in fig. 8, the increase in strength was not significant with the addition of CarboresP exceeding 1%. FIG. 9 is a photograph of a high temperature fracture resistant microstructure of a sample without carboresP added; fig. 10 is a high temperature fracture micrograph of a sample with 1% carboresp added, which can be seen to form a more dense structure in fig. 10. Through experimental comparative analysis, a more compact mullite crystal phase can be formed by adding 1% of carboresP, and the high-temperature fracture resistance is improved.
Through the experimental comprehensive analysis, in the Al2O3-SiC-C iron runner system, the high-temperature asphalt powder is added by 2 percent, and the optimal adding amount of the carboresP is matched to be 1 percent, so that the optimal comprehensive performance can be obtained.
On the basis of the research result, 2% of high-temperature asphalt powder is compounded with 1% of carboresP as a composite carbon source to prepare the brown alumina matrix castable, and an industrial test is carried out on a blast furnace (the capacity of the blast furnace is 1080 cubic, the length of a main ditch to a small pit is 15m, the slag ditch is 11m, the material consumption is 65t, the next time of sleeve disassembly is carried out, the total use is 123 days, the average iron passing amount is more than 17.9 ten thousand t under the condition of once repair, the consumption of comprehensive refractory ton iron is low, and the economic benefit is obvious.
The method is used for the blast furnace tapping channel, effectively improves the slag iron erosion resistance, steadily improves the service life, reduces the ton iron cost consumption and effectively improves the comprehensive benefit. The product is used for blast furnace tapping channel, and has the characteristics of good construction performance, good slag and iron erosion resistance, high thermal shock stability, good environmental protection performance and the like.
As the high-temperature asphalt powder and the carboresP are used as the amorphous carbon with higher carbon residue, the composite carbon source has the advantages of small granularity, regular shape, high reactivity and the like, and the ceramic phase and the low melting phase formed at high temperature are introduced as the composite carbon source, so that the castable has good thermal shock property, small high-temperature creep deformation and difficult wetting with the iron slag.
The special coarse powder fine grinding device for producing the iron runner castable is adopted for products, so that the mixing uniformity is realized, the flow property of the castable is improved, the setting time is effectively controlled, the construction and demolding time of the castable is facilitated to be regulated, and the special production technology of the product is formed.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.

Claims (7)

1. The refractory castable for the blast furnace cast house iron runner is characterized by comprising the following components:
45-55 parts of fused brown corundum;
15-25 parts of silicon carbide;
10-15 parts of composite micro powder;
2-5 parts of Secar71 high alumina cement;
2-4 parts of metal silicon powder;
adding high-temperature asphalt powder with the mass fraction of 1-3% and carboresP with the mass fraction of 0.5-1.5% into the raw materials as a composite carbon source.
2. The refractory castable for a blast furnace casting pit according to claim 1, wherein the composite fine powder is a mixture of Al2O3 fine powder and silica fine powder.
3. The refractory castable for the blast furnace casting pit according to claim 1, comprising the following components:
45-55 parts of fused brown corundum;
15-25 parts of silicon carbide;
10-15 parts of composite micro powder;
2-5 parts of Secar71 high alumina cement;
2-4 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% and carboresP with the mass fraction of 1% into the raw materials as a composite carbon source.
4. The refractory castable for the blast furnace casting pit according to claim 1, comprising the following components:
55 parts of electric smelting brown corundum;
20 parts of silicon carbide;
12 parts of composite micro powder;
3 parts of Secar71 high alumina cement;
3 parts of metal silicon powder;
and adding high-temperature asphalt powder with the mass fraction of 2% and carboresP with the mass fraction of 1% into the raw materials as a composite carbon source.
5. The refractory castable for a blast furnace casting pit according to claim 2, wherein the fine powder of Al2O3 is a fine powder of Al2O3 having a particle size D50 of less than 1.8 μm, and the fine powder of silica is a fine powder of silica having a particle size D50 of less than 1.7 μm.
6. The refractory castable for a blast furnace casting pit according to claim 5, wherein the weight ratio of the Al2O3 fine powder to the silicon fine powder is 1:1.
7. A method for preparing the refractory castable for the blast furnace cast-iron runner according to claims 1 to 6, comprising the steps of:
(1) Detecting and premixing electric smelting brown corundum, silicon carbide and Secar71 high alumina cement and composite micro powder in the raw materials;
(2) Dry-mixing the raw materials with CarboresP and high-temperature asphalt powder;
(3) Adding the same amount of water for wet mixing; stirring the materials uniformly, vibrating and forming on a vibrating table to prepare a strip sample, curing by a normal temperature belt die, demolding, drying and baking to obtain the finished product.
CN202310742200.3A 2023-06-21 2023-06-21 Refractory castable for blast furnace cast house iron runner and preparation method thereof Pending CN116639963A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109293375A (en) * 2018-09-17 2019-02-01 洛阳润昌窑业有限公司 A kind of blast furnace iron tap channel refractory pour material and preparation method
CN112608138A (en) * 2020-12-18 2021-04-06 安徽工业大学 High oxidation resistance non-cement bonded Al2O3-SiC-C refractory castable and preparation method thereof
WO2021238029A1 (en) * 2020-05-29 2021-12-02 郑州市瑞沃耐火材料有限公司 High-thermal-conductivity molten iron trough castable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109293375A (en) * 2018-09-17 2019-02-01 洛阳润昌窑业有限公司 A kind of blast furnace iron tap channel refractory pour material and preparation method
WO2021238029A1 (en) * 2020-05-29 2021-12-02 郑州市瑞沃耐火材料有限公司 High-thermal-conductivity molten iron trough castable
CN112608138A (en) * 2020-12-18 2021-04-06 安徽工业大学 High oxidation resistance non-cement bonded Al2O3-SiC-C refractory castable and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨强等: "复合碳源对铁沟浇注料性能的影响", 工业加热, vol. 49, no. 20, 31 December 2020 (2020-12-31), pages 19 - 23 *

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