CN107010965B - Quick-hardening type blast furnace hearth repairing material and preparation method thereof - Google Patents
Quick-hardening type blast furnace hearth repairing material and preparation method thereof Download PDFInfo
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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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- 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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- 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
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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
- 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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- 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
- C04B2235/70—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
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
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Abstract
The invention discloses a quick-hardening blast furnace hearth repairing material, which comprises the following components: the composite corundum superfine grinding material comprises a solid material, an additive and a bonding agent, wherein the solid material comprises corundum particles and/or fine powder, silicon carbide particles and/or fine powder, a carbon additive and composite superfine powder, and the additive comprises a dispersing agent and a coagulant. The invention also discloses a preparation method of the quick-hardening blast furnace hearth repairing material. The repair material is self-flowing and quick-hardening, can be tightly attached to a carbon brick formwork of the hearth for pumping and pouring, a pouring body is tightly attached to the carbon brick, the construction is quick, simple and convenient, the repair material is quickly hardened, the construction period can be effectively shortened by one fourth, the repaired hearth has good structural integrity, no brick joints exist, and the compactness is high.
Description
Technical Field
The invention belongs to the technical field of metallurgical refractory materials, relates to a material for repairing a blast furnace hearth and a preparation method thereof, and more particularly relates to a quick-hardening pumping self-flow repairing material for repairing the blast furnace hearth and a preparation method thereof.
Background
Since the copper cooling wall is adopted in the furnace body and the furnace belly, the weak link of the long service life of the blast furnace is transferred to the hearth part from the middle lower part of the furnace body, the furnace waist and the furnace belly. According to incomplete statistics, in recent years, more than 50 large blast furnace hearths have been subjected to burnthrough accidents in China, more than 10 blast furnaces have been subjected to burnthrough accidents abroad, many blast furnaces even occur in the initial stage of the campaign, and some blast furnaces are even opened for less than 1 year. Meanwhile, the phenomenon that the temperature of the side wall of the hearth of many domestic blast furnaces rises greatly after the blast furnaces are opened is avoided, and the safe production and the service life of the first-generation blast furnace are seriously threatened. Through research and analysis, the hearth structure of brickwork or ceramic cup commonly used in the blast furnace at present has the advantages that not only products need to be customized in advance and the construction time is long, but also the influence of the thickness of the brickwork joints of all parts on the long service life of the blast furnace is large, the general hearth corrosion starts from the brickwork joints, and the problem of the fit between the ceramic cup and the residual carbon brick is difficult to solve when the hearth is repaired. The existence of the hidden production troubles brings huge economic loss to enterprises, and effective measures should be taken to solve the problem.
Disclosure of Invention
The blast furnace hearth integral casting repair technology is developed at the same time, the construction adopts a continuous pumping mode, the materials adopt sol combination, free water is not generated, and the blast furnace hearth integral casting repair technology can be quickly baked and explosion-proof; the construction body has the characteristics of good integrity, high strength, slag iron corrosion resistance and the like; in order to shorten the overhaul time of the furnace hearth and prolong the service life, reliable guarantee is provided. Because the hearth is pumped and layered poured, the material firstly has self-fluidity and is convenient to construct; secondly, the hardening time of the material is as fast as possible to produce strength on the basis of construction time, which is beneficial to shortening the engineering period, improving the construction efficiency and creating engineering benefits.
Therefore, the invention is developed aiming at the whole pouring repair technology of the blast furnace hearth, and the invention aims to provide the quick-hardening type blast furnace hearth repair material and the preparation method thereof, wherein the repair material is self-flow type and quick-hardening type, can be tightly attached to a hearth carbon brick formwork for pumping pouring, a pouring body is tightly attached to a carbon brick, the construction is quick and simple, the repair material is quickly hardened, and the construction period can be effectively shortened by one fourth; the repaired hearth has good structural integrity, no brick joints and high compactness.
According to one aspect of the invention, the invention provides a quick-hardening type blast furnace hearth repairing material, a solid material, an additive and a bonding agent, wherein the solid material comprises corundum particles and/or fine powder, silicon carbide particles and/or fine powder, a carbon additive and composite superfine powder, and the additive comprises a dispersing agent and a coagulant.
Wherein the solid material component comprises, by weight percent,
62% -72% of corundum particles and/or fine powder;
15% -23% of the silicon carbide particles and/or fine powder;
1% -3% of the carbon additive;
8% -12% of the composite superfine powder;
preferably, Al is in the corundum particles or fines2O3The content is more than or equal to 94 percent; the corundum particles have the granularity of 5-8 mm, 3-5 mm, 1-3 mm and 0-1 mm; the granularity of the corundum fine powder is less than or equal to 0.088 mm; the raw materials with the corundum particle size larger than 1mm account for 40-52% of the total weight of the solid materials.
Preferably, the SiC content in the silicon carbide particles or the fine powder is more than or equal to 95 percent; the granularity of the silicon carbide particles is less than or equal to 1 mm; the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm.
Preferably, the carbon additive is spherical asphalt particles, and the softening point of the spherical asphalt particles is more than or equal to 90 ℃; the particle size of the spherical asphalt particles is less than or equal to 1 mm.
Preferably, the composite superfine powder comprises active SiO2Powders and α -Al2O3Powder, wherein the granularity of the composite superfine powder is less than or equal to 5 mu m; wherein the active SiO2SiO of powder2The content is more than or equal to 90 percent, and the α -Al2O3Powdered Al2O3The content is more than or equal to 99 percent.
Preferably, the weight of the dispersing agent is 1% of that of the composite superfine powder, and the dispersing agent is sodium hexametaphosphate.
Preferably, the accelerator comprises pure calcium aluminate cement, aluminum sulfate and at least one of the optional components, wherein the optional components comprise: the solid material comprises sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, sodium carbonate, potassium carbonate, lithium carbonate, magnesium carbonate, sodium sulfate, potassium sulfate, lithium sulfate, magnesium sulfate, sodium phosphate, potassium phosphate, lithium phosphate, magnesium phosphate, sodium phosphite, potassium phosphite, lithium phosphite and magnesium phosphite, wherein the pure calcium aluminate cement accounts for 1% of the total weight of the solid material, the aluminum sulfate accounts for 0.04% of the total weight of the solid material, and the optional components account for 0.01% of the total weight of the solid material.
Preferably, the bonding agent is silica sol, SiO2The content is 30-31%, and the weight of the bonding agent is 7-8% of the total weight of the solid material.
According to another aspect of the invention, the invention provides a preparation method of a quick-hardening type blast furnace hearth repairing material, which comprises the following steps:
sampling and preparing the composite superfine powder, the dispersing agent and the coagulant according to the weight percentage, uniformly mixing for 5-8 minutes in a double-helix conical stirrer to obtain mixed powder, and taking out the mixed powder;
preparing solid materials except the composite superfine powder according to the proportion, and uniformly mixing the prepared solid materials with the obtained mixed powder in a planetary forced mixer for 3-5 minutes to obtain a mixture;
and adding a sol binding agent prepared in proportion into the obtained mixture, uniformly mixing for 5-10 minutes in a planetary forced mixer, and uniformly stirring to obtain the quick-hardening blast furnace hearth repairing material.
The invention has the following beneficial effects through engineering inspection:
1. the quick-hardening type blast furnace hearth repairing material is suitable for pumping construction, has good self-flowing property, is quick to harden, and is simple and convenient to construct and high in efficiency;
2. the quick-hardening repairing material for the blast furnace hearth only needs to locally remove severely pulverized carbon bricks for repairing, and does not need to remove a large amount of carbon bricks for re-building;
3. the material of the quick-hardening blast furnace hearth repairing material has the advantages of no water, quick drying and explosion prevention, and can quickly recover the production of a blast furnace;
4. by adopting the rapid hardening type blast furnace hearth repairing material, the repaired hearth is seamless as a whole, and the expansion matching with carbon bricks is ensured, so that iron infiltration and iron drilling are avoided;
5. the high-temperature erosion resistance and corrosion resistance of the rapid-hardening type blast furnace hearth repairing material are good, and the service life of a blast furnace can be effectively prolonged by more than two years.
Detailed Description
The technical solution of the present invention is further described in detail with reference to specific embodiments, which are intended to better understand the content of the present invention and not to limit the protection scope of the present invention:
the invention provides a quick-hardening blast furnace hearth repairing material, which comprises a solid material, an additive and a bonding agent, wherein the solid material comprises corundum particles and/or fine powder, silicon carbide particles and/or fine powder, a carbon additive and composite superfine powder, and the additive comprises a dispersing agent and a coagulant;
wherein the solid material component comprises, by weight percent,
62% -72% of corundum particles and/or fine powder;
15% -23% of the silicon carbide particles and/or fine powder;
1% -3% of the carbon additive;
8% -12% of the composite superfine powder;
in the repair material, Al is contained in the corundum particles or fine powder2O3The content is more than or equal to 94 percent; the corundum particles are matched and combined in four grades with the granularity of 5-8 mm, 3-5 mm, 1-3 mm and 0-1 mm, and play a role in supporting a framework in the repair material; the granularity of the corundum fine powder is less than or equal to 0.088 mm. Wherein, in order to ensure the self-flowing property of the repair material, the raw material with the corundum particle size of 1 mm-8 mm accounts for 40% -52% of the total weight of the solid material; preferably, brown corundum particles and/or brown corundum fine powder are selected; as the hearth bears the mechanical scouring of liquid slag iron, the damage of high-temperature thermal stress, and the infiltration and floating action of molten iron in the blast furnace smelting process, corundum raw materials are required to be selected as a supporting framework to improve the refractoriness of the materials and ensure the refractory performance and the anti-scouring performance of the hearth repairing material.
The SiC content in the silicon carbide particles or the fine powder is more than or equal to 95 percent; the granularity of the silicon carbide particles is less than or equal to 1 mm; the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm. The addition of silicon carbide can improve the thermal shock resistance and oxidation resistance of the material and improve the spalling resistance and erosion resistance of the material.
The carbon additive is preferably spherical asphalt particles, and the softening point of the spherical asphalt particles is more than or equal to 90 ℃; the particle size of the spherical asphalt particles is less than or equal to 1 mm. The carbon additive plays a role in bonding and recarburizing, improves the compactness, the oxidation resistance and the anti-permeability, and enhances the erosion resistance and the anti-scouring capability of the repairing material. And the preferred spherical asphalt can improve the self-fluidity of the material, is easy for pumping construction of the repairing material and ensures the integrity of the lining body of the hearth.
The composite superfine powder is preferably active SiO2Powders and α -Al2O3Powder, wherein the granularity of the composite superfine powder is less than or equal to 5 mu m; preferably, wherein the active SiO2SiO of powder2The content is more than or equal to 90 percent, and the α -Al2O3Powdered Al2O3The content is more than or equal to 99 percent. The composite superfine powder can fill micropores, improve the fluidity and the volume density of the repair material, reduce the apparent porosity, promote the sintering of the material and obviously improve the high-temperature strength of the repair material.
The content of the dispersing agent is 1 percent of the weight of the composite superfine powder; the dispersing agent is sodium hexametaphosphate, and can improve the dispersibility of the composite superfine powder.
The accelerator comprises pure calcium aluminate cement, aluminum sulfate and at least one of optional components, wherein the optional components comprise: sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, sodium carbonate, potassium carbonate, lithium carbonate, magnesium carbonate, sodium sulfate, potassium sulfate, lithium sulfate, magnesium sulfate, sodium phosphate, potassium phosphate, lithium phosphate, magnesium phosphate and sodium phosphite, potassium phosphite, lithium phosphite, magnesium phosphite. Wherein, the pure calcium aluminate cement has high bonding strength and stable setting time. Preferably, the pure calcium aluminate cement accounts for 1% of the total weight of the solid material, the aluminum sulfate accounts for 0.04% of the total weight of the solid material, and the optional components account for 0.01% of the total weight of the solid material. More preferably, the accelerator comprises 1% by weight of pure calcium aluminate cement, based on the total weight of the solid charge, 0.04% by weight of aluminium sulphate, based on the total weight of the solid charge, and 0.01% by weight of sodium hydroxide, based on the total weight of the solid charge.
The binding agent is silica sol, wherein SiO2The content of the binder is 30% -31%, and the weight of the binder accounts for 7% -8% of the total weight of the solid material. The silica sol binder has the advantages of large specific surface area, high adsorbability, high cohesiveness, high temperature resistance, no free water, quick baking and explosion prevention, and is an ideal binder for hearth repairing materials.
The preparation method of the rapid hardening type blast furnace hearth repairing material comprises the following steps:
preparing the composite superfine powder, the dispersing agent and the coagulant according to the weight parts, uniformly mixing for 5-8 minutes in a double-helix conical mixer to obtain mixed powder, and taking out the mixed powder;
then preparing solid materials except the composite superfine powder according to the proportion, and uniformly mixing the prepared solid materials with the taken mixed powder in a planetary forced mixer for 3-5 minutes to obtain a mixed material;
and finally, adding the sol binder prepared according to the proportion into the obtained mixture on a construction site, uniformly mixing in a planetary forced mixer for 5-10 minutes, and uniformly stirring to obtain the quick-hardening blast furnace hearth repairing material which can be used for pumping construction.
The technical solutions of the present invention are further illustrated by the following examples, but the following examples should not be construed as limiting the scope of the present invention.
Examples
The raw materials, the content thereof according to parts by weight and the main technical performance indexes of the quick-hardening blast furnace hearth repairing material of the invention in each embodiment are listed in table 1.
TABLE 1 examples and Properties
The determination of the free flow value is to pour the uniformly mixed repairing material into a truncated cone circular mold of a cement mortar fluidity tester, lift the circular mold to enable the repairing material to flow on a smooth flat plate until the repairing material is immobile, and then measure the diameter of the repairing material to be the free flow value. And (3) casting and molding the uniformly mixed repairing material in a standard mold of 40 mm, 40 mm and 160 mm, wherein the pressing is regarded as a hardening standard. The fast-hardening repair material for the blast furnace hearth has good self-flowing property and fast hardening. The performance indexes such as flexural strength, compressive strength, linear change rate and the like measured according to the regulations in national standards are excellent.
Claims (2)
1. A quick-hardening blast furnace hearth repairing material is characterized by comprising a solid material, an additive and a bonding agent, wherein the solid material comprises corundum particles and fine powder, silicon carbide particles and fine powder, a carbon additive and composite superfine powder, and the additive comprises a dispersing agent and a coagulant;
the solid material components are calculated by weight percentage,
62 to 72 percent of corundum particles and fine powder;
15% -23% of silicon carbide particles and fine powder;
1% -3% of the carbon additive;
8% -12% of the composite superfine powder;
al in the corundum particles or corundum fine powder2O3The content is more than or equal to 94 percent; the particle size of the corundum particles is 5-8 mm, 3-5 mm, 1-3 mm and 0-1 mm; the granularity of the corundum fine powder is less than or equal to 0.088 mm; the raw material with the corundum particle size of 1 mm-8 mm accounts for 40% -52% of the total weight of the solid material;
the SiC content in the silicon carbide particles or the silicon carbide fine powder is more than or equal to 95 percent; the granularity of the silicon carbide particles is less than or equal to 1 mm; the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm;
the carbon additive is spherical asphalt particles, the softening point of the spherical asphalt particles is more than or equal to 90 ℃, and the granularity of the spherical asphalt particles is less than or equal to 1 mm;
the composite superfine powder comprises active SiO2Powders and α -Al2O3Powder, wherein the granularity of the composite superfine powder is less than or equal to 5 mu m; wherein the active SiO2SiO of powder2The content is more than or equal to 90 percent, and the α -Al2O3Powdered Al2O3The content is more than or equal to 99 percent;
the weight of the dispersing agent is 1% of that of the composite superfine powder, and the dispersing agent is sodium hexametaphosphate;
the accelerator comprises pure calcium aluminate cement, aluminum sulfate and at least one of optional components, wherein the optional components comprise: sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, sodium carbonate, potassium carbonate, lithium carbonate, magnesium carbonate, sodium sulfate, potassium sulfate, lithium sulfate, magnesium sulfate, sodium phosphate, potassium phosphate, lithium phosphate, magnesium phosphate and sodium phosphite, potassium phosphite, lithium phosphite, magnesium phosphite, wherein the pure calcium aluminate cement comprises 1% of the total weight of the solid material, the aluminum sulfate comprises 0.04% of the total weight of the solid material, and the optional component comprises 0.01% of the total weight of the solid material;
the binding agent is silica sol or SiO2The content is 30-31%, and the weight of the bonding agent is 7-8% of the total weight of the solid material.
2. The preparation method of the quick hardening type blast furnace hearth repairing material according to claim 1 comprises the following steps:
sampling and preparing the composite superfine powder, the dispersing agent and the coagulant, uniformly mixing for 5-8 minutes in a double-helix conical stirrer to obtain mixed powder, and taking out the mixed powder;
preparing solid materials except the composite superfine powder, and uniformly mixing the prepared solid materials with the obtained mixed powder in a planetary forced mixer for 3-5 minutes to obtain a mixed material;
and adding a binding agent into the obtained mixture, uniformly mixing for 5-10 minutes in a planetary forced mixer, and uniformly stirring to obtain the quick-hardening blast furnace hearth repairing material.
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| CN110963789B (en) * | 2018-09-29 | 2022-08-09 | 中冶建筑研究总院有限公司 | Blast furnace crack pouring material and preparation method thereof |
| CN111763088B (en) * | 2019-04-02 | 2022-03-15 | 上海梅山钢铁股份有限公司 | Spray paint for joint of blast furnace cast iron cooling wall and blast furnace lining and preparation method thereof |
| CN112479689A (en) * | 2020-10-30 | 2021-03-12 | 云南濮耐昆钢高温材料有限公司 | Quick-drying explosion-proof high-strength wear-resistant castable |
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| CN102234199A (en) * | 2011-04-18 | 2011-11-09 | 西峡县新锦耐化有限责任公司 | High-titanium furnace protection stemming |
| CN104944989A (en) * | 2015-06-30 | 2015-09-30 | 中冶武汉冶金建筑研究院有限公司 | Silicon sol combined corundum-silicon carbide wet-type spray material |
| CN105732052A (en) * | 2015-12-31 | 2016-07-06 | 中国京冶工程技术有限公司 | Nano silica sol combination hearth self-flowing material and preparation method thereof |
| CN106461333A (en) * | 2014-03-21 | 2017-02-22 | 维苏威坩埚公司 | Blast furnace hearth repair material |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234199A (en) * | 2011-04-18 | 2011-11-09 | 西峡县新锦耐化有限责任公司 | High-titanium furnace protection stemming |
| CN106461333A (en) * | 2014-03-21 | 2017-02-22 | 维苏威坩埚公司 | Blast furnace hearth repair material |
| CN104944989A (en) * | 2015-06-30 | 2015-09-30 | 中冶武汉冶金建筑研究院有限公司 | Silicon sol combined corundum-silicon carbide wet-type spray material |
| CN105732052A (en) * | 2015-12-31 | 2016-07-06 | 中国京冶工程技术有限公司 | Nano silica sol combination hearth self-flowing material and preparation method thereof |
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