CN112552059A - Steel ladle slag line repairing material - Google Patents

Steel ladle slag line repairing material Download PDF

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Publication number
CN112552059A
CN112552059A CN202011447800.XA CN202011447800A CN112552059A CN 112552059 A CN112552059 A CN 112552059A CN 202011447800 A CN202011447800 A CN 202011447800A CN 112552059 A CN112552059 A CN 112552059A
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Prior art keywords
percent
slag line
powder
ladle slag
repairing material
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Inventor
陈超
青光红
刘嵩
黄天翔
赵杰
邓小兵
高亮
胡志豪
郑常波
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Gangcheng Group Liangshan Ruihai Industry Co ltd
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Gangcheng Group Liangshan Ruihai Industry Co ltd
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Priority to CN202011447800.XA priority Critical patent/CN112552059A/en
Publication of CN112552059A publication Critical patent/CN112552059A/en
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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
    • C—CHEMISTRY; METALLURGY
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • 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
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • 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
    • C04B2235/3427—Silicates other than clay, e.g. water glass
    • C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
    • C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C—CHEMISTRY; METALLURGY
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    • 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
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • 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

Abstract

The invention discloses a ladle slag line repairing material, which belongs to the technical field of ladle refractory materials and comprises the following components in percentage by weight: 43 to 47 percent of mullite, 11 to 13 percent of aluminum titanate, 6 to 8 percent of light-burned magnesia powder, 5 to 8 percent of activated alumina micro powder, 6 to 8 percent of waste slide plate micro powder, 10 to 11 percent of alumina powder, 3 to 5 percent of Guangxi white mud, 3 to 5 percent of bentonite, 2 to 4 percent of micro silicon powder, 5 to 6 percent of cement, 0.8 to 1 percent of borax, 0.1 to 0.15 percent of sodium hexametaphosphate and 0.05 to 0.08 percent of explosion-proof fiber; the ladle slag line repairing material has the characteristics of excellent thermal shock resistance, stability, slag corrosion resistance, easiness in sintering and long service life, protects the ladle slag line bricks, enables the service life of the ladle slag line bricks to be matched with that of other working layer bricks, and reduces material waste.

Description

Steel ladle slag line repairing material
Technical Field
The invention belongs to the technical field of ladle refractory materials, and particularly relates to a ladle slag line repairing material.
Background
Because of the continuous development of the steel-making technology in China and the continuous increase of steel types, the time of the treatment process of the LF furnace is obviously prolonged nowadays, in order to accelerate the melting speed of alloy and refined slag, a certain amount of sodium salt and calcium fluoride materials are added as fluxing agents, but the corrosion of the ladle slag line part is undoubtedly accelerated, so that the service life of the ladle slag line brick is shorter than that of the working layer bricks at other parts.
At present, most steel mills adopt the following measures in order to synchronize the service life of slag line bricks and other working layer bricks and reduce the off-line times: under the condition of unchanged thickness, improving the material quality to prolong the whole service life of the slag line brick, and painting a layer of slag line repairing material to supplement the service life during building; the overall service life of the slag line-lifting brick can effectively make up for the corresponding service life, but the cost is correspondingly higher, and the cost performance of the slag line repairing material is higher, so that the slag line repairing material is still widely applied to various large steel mills at present.
When the steel ladle is electrically heated, the electrode contacts with the slag line layer to be heated, the temperature is higher and is generally 1600 ℃, and when the slag layer is directly contacted with the molten steel, the contact temperature generally fluctuates between 1300 ℃ and 1550 ℃, so that the slag line repairing material needs to have certain sintering property and thermal shock resistance stability at the temperature, and has corresponding slag corrosion and infiltration resistance.
Disclosure of Invention
Aiming at the problem that the service life of the conventional slag line repairing material is fluctuated due to the common defects, the invention provides a ladle slag line repairing material.
The technical scheme of the invention is as follows: the steel ladle slag line repairing material comprises the following components in percentage by weight: 43 to 47 percent of mullite, 11 to 13 percent of aluminum titanate, 6 to 8 percent of light-burned magnesia powder, 5 to 8 percent of activated alumina micro powder, 6 to 8 percent of waste slide plate micro powder, 10 to 11 percent of alumina powder, 3 to 5 percent of Guangxi white mud, 3 to 5 percent of bentonite, 2 to 4 percent of micro silicon powder, 5 to 6 percent of cement, 0.8 to 1 percent of borax, 0.1 to 0.15 percent of sodium hexametaphosphate and 0.05 to 0.08 percent of explosion-proof fiber.
Further limiting, the mullite accounts for 16-18 wt% of the ladle slag line repairing material with the grain diameter of 2-5 mm, 15-16 wt% of the ladle slag line repairing material with the grain diameter of 1-2 mm, and 12-13 wt% of the ladle slag line repairing material with the grain diameter of 0.074-1 mm.
3. The ladle slag line repairing material according to claim 1, characterized in that: the grain diameter of the aluminum titanate is less than 0.074 mm.
Further, the particle size of the light-burned magnesium powder, the particle size of the active alumina micro powder, the particle size of the waste skateboard micro powder, the particle size of the alumina powder, the particle size of the Guangxi white mud, the particle size of the bentonite, the particle size of the silica fume and the particle size of the cement are all less than 0.074 mm.
Further limiting, the particle size of the borax is 0.074-1 mm.
Further defined in that, by weight percent, Al is present therein2O3≥50％，MgO≥5％，Al2TiO5≥9.0％，SiO2≤10，C≥0.5％。
Further limiting, the mass percentage of the water in the ladle slag line repairing material is less than or equal to 1%.
Further defined, at least one of: al in the mullite in percentage by weight2O3SiO is more than or equal to 60 percent2≤35％；
Al in the aluminum titanate2TiO5≥95％；
MgO in the light-burned magnesium powder is more than or equal to 90 percent;
al in the active alumina micro powder2O3≥99％；
Al in the waste slide plate micro powder2O3Not less than 60% and fixed carbon not less than 6%;
al in the bauxite powder2O3≥85％；
SiO in Guangxi white mud2Not less than 49% of Al2O3≥32％；
The bentonite is sodium-based, wherein the content of montmorillonite is 85-90%;
the cement is Al2O3More than or equal to 50 percent of CA-70 type calcium aluminate cement;
SiO in the micro silicon powder2≥94％；
The sodium hexametaphosphate meets the requirements of HG/T2837-1997;
the grade of the explosion-proof fiber is JX-3-3;
the borax meets the requirements of GB/T537-1997.
Compared with the prior art, the invention has the beneficial effects that: the ladle slag line repairing material has the characteristics of excellent thermal shock resistance, stability, slag corrosion resistance, easiness in sintering and long service life, protects the ladle slag line bricks, enables the service life of the ladle slag line bricks to be matched with that of other working layer bricks, and reduces material waste.
The slag line brick has Al as basic component2O3MgO-C, the basic component of the ladle slag line repairing material is Al2TiO5(aluminum titanate) to 3Al2O32SiO2The mullite is mainly used for providing a basic framework support for the ladle slag line repairing material, is a main source for providing a mullite phase, has certain volume stability and excellent slag corrosion resistance, can form a composite ceramic structure with aluminum titanate, makes up the low-temperature decomposition performance of the aluminum titanate, and forms composite ceramic with good thermodynamic property;
the aluminum titanate has a high melting point of 1800 ℃ and a low coefficient of expansion of 0 to 1 x 10-6Is a high-quality high-temperature resistant material;
the alumina powder, the light-burned magnesium powder, the active aluminum oxide, the Guangxi white mud, the bentonite, the micro silicon powder, the sodium hexametaphosphate and the cement can provide viscosity and health-preserving strength meeting basic construction conditions for the slag line repairing material, and simultaneously form new phases (such as mullite and magnesia alumina spinel) with the slag line bricks under high temperature conditions to promote high-temperature sintering, and the formed new phases can resist the erosion of slag.
Al in waste slide plate micro powder2O3The content of the fixed carbon is more than or equal to 60 percent and more than or equal to 6 percent, partial aluminum materials and carbon sources can be provided, and the smearing property and the oxidation resistance of the slag line repairing material are improved.
The mass percent of the mullite is 43-47%, the grain diameter is 0.074-5mm, the adhesion of the coating is reduced and the coating is loose mainly because of too much mullite, and the frame part of the coating is weak because of too little aggregate, thereby affecting the high-temperature mechanical property.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are described in detail and completely, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The components and physical and chemical index detection conditions of the ladle slag line repairing material are shown in table 1, and sodium hexametaphosphate, borax and explosion-proof fibers are not listed in national standards.
TABLE 1 example physical and chemical indexes of raw materials of ladle slag line repairing material
Figure BDA0002825442830000051
The ladle slag line repairing material prepared by the invention needs to meet the physicochemical indexes shown in the table 2:
TABLE 2 physical and chemical indexes of ladle slag line repairing material
Figure BDA0002825442830000052
Figure BDA0002825442830000061
Example 1
The formula of the adopted raw materials is shown in table 3, after the raw materials are qualified, the raw materials are weighed, stirred and packaged, then sampling detection is carried out, the physical and chemical indexes of the ladle slag line repairing material are shown in table 4, and the steel ladle slag line repairing material is transported to a steel ladle cold repair operation area for use after being qualified.
Table 3 ladle slag line repair material formulation 1
Figure BDA0002825442830000062
Figure BDA0002825442830000071
Table 4 example 1 physical and chemical detection index of ladle slag line repair material
Item The detection result is%
Al2O3 53.00
MgO 6.33
C 0.56
Al2TiO5 10.45
SiO2 19.80
Bulk density, g/cm3(110℃*24h) 2.88
Flexural strength, MP (1300 ℃ 3h) 5.16
Flexural strength, MP (1600 ℃ C. 3h) 6.20
Change in dead firing line (% (1300 ℃ C. 3h) 0.008
In the embodiment, the ladle slag line repairing material is smeared on the position of a ladle slag line brick, the ladle slag line repairing material is sent to a steel ladle cold repair area of a certain steel mill for 3 tons, smearing data and online data after smearing 3 ladles are collected, the smearing data and the online data are compared with slag line repairing materials of other manufacturers in an equal way, the smearing performance of 3 test ladles is superior, the adhesion rate reaches 94%, no material collapse and crack phenomena occur in the maintenance process, the online use times are 14 times, 16 times and 14 times respectively, the average use time is 14.6 times, and the use requirement that the online use time is more than 10 times of a user can be met; the smearing performance of the comparison tank is equivalent to that of the embodiment, the using times of the online process are respectively 8 times, 6 times and 8 times, and the average number is 7.3 times, so that the requirement that the online times are more than 10 times cannot be met.
Example 2
The formula of the adopted raw materials is shown in table 5, after the raw materials are qualified, the raw materials are weighed, stirred and packaged, then sampling detection is carried out, the physical and chemical indexes of the ladle slag line repairing material are shown in table 6, and the steel ladle slag line repairing material is transported to a steel ladle cold repair operation area for use after being qualified.
TABLE 5 ladle slag line repair material formulation 2
Name of raw materials Raw material particle size (mm) Ratio (%)
Mullite 2-5 18.00
Mullite 1-2 15.00
Mullite 0.074-1 12.00
Aluminum titanate <0.074 12.00
Light-burned magnesium powder <0.074 6.00
Activated alumina micropowder <0.005 5.00
Waste slide plate micro powder <0.074 8.00
85 bauxite powder <0.074 10.00
Guangxi white mud <0.074 3.00
Bentonite clay <0.074 3.00
Silicon micropowder <0.074 2.00
CA70 cement <0.074 5.00
Borax _ 1.00
Sodium hexametaphosphate _ 0.13
Explosion-proof fiber _ 0.05
TABLE 6 example 2 physicochemical detection indexes of ladle slag line repairing material
The items% The detection result is%
Al2O3 58.20
MgO 5.40
C 0.64
Al2TiO5 11.40
SiO2 19.80
Bulk density, g/cm3(110℃*24h) 2.79
Flexural strength, MP (1300 ℃ 3h) 5.11
Flexural strength, MP (1600 ℃ C. 3h) 6.80
Change in dead firing line (% (1300 ℃ C. 3h) 0.005
In the embodiment, the ladle slag line repairing material is smeared on the position of a ladle slag line brick, the ladle slag line repairing material is sent to a ladle cold repair area of a certain steel plant for 4 tons, smearing data and online data after smearing 4 ladles are collected, the smearing data and the online data are compared with slag line repairing materials of other manufacturers in an equivalent way, the smearing performance of 4 test ladles is superior, the adhesion rate reaches 92.5 percent, no material collapse occurs in the maintenance process, the crack phenomenon occurs, the online use times are respectively 15 times, 13 times and 17 times, the average use time is 15 times, and the use requirement that the online use time is more than 10 times can be met by a user; the smearing performance of the comparative tank is equivalent to that of the embodiment, the using times of the online process are respectively 7 times, 6 times and 10 times, and the average time is 7.5 times, but the requirement that the online times are more than 10 times cannot be met.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.

Claims (8)

1. The steel ladle slag line repairing material is characterized by comprising the following components in percentage by weight: 43 to 47 percent of mullite, 11 to 13 percent of aluminum titanate, 6 to 8 percent of light-burned magnesia powder, 5 to 8 percent of activated alumina micro powder, 6 to 8 percent of waste slide plate micro powder, 10 to 11 percent of alumina powder, 3 to 5 percent of Guangxi white mud, 3 to 5 percent of bentonite, 2 to 4 percent of micro silicon powder, 5 to 6 percent of cement, 0.8 to 1 percent of borax, 0.1 to 0.15 percent of sodium hexametaphosphate and 0.05 to 0.08 percent of explosion-proof fiber.
2. The ladle slag line repairing material according to claim 1, wherein the mullite has a grain size of 2-5 mm, a grain size of 15-16% and a grain size of 0.074-1 mm, and the mullite has a grain size of 16-18% by weight of the ladle slag line repairing material, and a grain size of 12-13% by weight of the ladle slag line repairing material.
3. The ladle slag line repairing material according to claim 1, characterized in that: the grain diameter of the aluminum titanate is less than 0.074 mm.
4. The ladle slag line repairing material according to claim 1, characterized in that: the particle size of the light-burned magnesium powder, the particle size of the active alumina micro powder, the particle size of the waste skateboard micro powder, the particle size of the alumina powder, the particle size of Guangxi white mud, the particle size of bentonite, the particle size of the micro silicon powder and the particle size of cement are all less than 0.074 mm.
5. The ladle slag line repairing material according to claim 1, characterized in that: the particle size of the borax is 0.074-1 mm.
6. The ladle slag line repairing material according to claim 1, characterized in that: in weight percent, wherein Al2O3≥50％，MgO≥5％，Al2TiO5≥9.0％，SiO2≤10，C≥0.5％。
7. The ladle slag line repairing mix according to any one of claims 1 to 6, characterized in that: the mass percentage of the water in the ladle slag line repairing material is less than or equal to 1 percent.
8. The ladle slag line repair mix according to claim 1, wherein at least one of the following is satisfied: al in the mullite in percentage by weight2O3SiO is more than or equal to 60 percent2≤35％；
Al in the aluminum titanate2TiO5≥95％；
MgO in the light-burned magnesium powder is more than or equal to 90 percent;
al in the active alumina micro powder2O3≥99％；
Al in the waste slide plate micro powder2O3Not less than 60% and fixed carbon not less than 6%;
al in the bauxite powder2O3≥85％；
SiO in Guangxi white mud2Not less than 49% of Al2O3≥32％；
The bentonite is sodium-based, wherein the content of montmorillonite is 85-90%;
the cement is Al2O3More than or equal to 50 percent of CA-70 type calcium aluminate cement;
SiO in the micro silicon powder2≥94％；
The sodium hexametaphosphate meets the requirements of HG/T2837-1997;
the grade of the explosion-proof fiber is JX-3-3;
the borax meets the requirements of GB/T537-1997.
CN202011447800.XA 2020-12-09 2020-12-09 Steel ladle slag line repairing material Pending CN112552059A (en)

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