CN114751757A - Long-life ladle slag line brick and preparation method thereof - Google Patents

Long-life ladle slag line brick and preparation method thereof Download PDF

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Publication number
CN114751757A
CN114751757A CN202210503776.XA CN202210503776A CN114751757A CN 114751757 A CN114751757 A CN 114751757A CN 202210503776 A CN202210503776 A CN 202210503776A CN 114751757 A CN114751757 A CN 114751757A
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slag line
ladle slag
line brick
long
electric smelting
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CN202210503776.XA
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Inventor
金从进
姜爱君
吕义华
节闯
杨政宏
李�杰
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Jiangsu Jiaht Materials Co ltd
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Jiangsu Jiaht Materials 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
    • C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • C04B35/0435—Refractories from grain sized mixtures containing refractory metal compounds other than chromium oxide or chrome ore
    • 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
    • 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
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • 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
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C04B2235/3248—Zirconates or hafnates, e.g. zircon
    • 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
    • C04B2235/40—Metallic constituents or additives not added as binding phase
    • C04B2235/402—Aluminium
    • 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
    • C04B2235/422—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
    • 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
    • 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
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • 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
    • 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
    • C04B2235/9684—Oxidation resistance

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention discloses a long-life ladle slag line brick, which relates to the technical field of refractory materials and comprises 65-80% of an electric smelting magnesia material, 4-10% of an electric smelting calcium zirconate material, 3-10% of an electric smelting monoclinic zirconia material, 12-17% of a carbon material and 1-3% of an antioxidant, wherein the zirconia content of the electric smelting monoclinic zirconia material is more than 95%, and the antioxidant comprises one or more of metal aluminum, simple substance silicon and aluminum-silicon alloy powder. The steel ladle slag line brick has excellent molten steel corrosion resistance, high fluorine slag resistance, thermal shock resistance and oxidation resistance, has the characteristics of good corrosion resistance and long service life when being used as the steel ladle slag line brick under the refining conditions of a long-time LF furnace and a VD furnace, and completely meets the requirements.

Description

Long-life ladle slag line brick and preparation method thereof
Technical Field
The invention relates to the technical field of refractory materials, in particular to a long-life ladle slag line brick and a preparation method thereof.
Background
In recent years, with the development of high-quality steels such as bearing steels, high-grade line steels, and pressure vessel steels, there has been a demand for steels having lower contents of oxygen and sulfur, and for steels having lower contents of large inclusions. In order to achieve the above purpose, steel mills usually adopt high-alkalinity refining slag with high fluorine content, the refining time is long, ladle slag line bricks are seriously corroded, the minor repair life and the major repair life of a ladle are reduced, and the consumption of per ton steel refractory materials is increased. The existing ladle slag line bricks mainly adopt magnesia carbon bricks (such as patent CN108424151A, patent CN101531533A and patent CN 112456975A), and one part of special steel grades adopts zircon carbon bricks (patent CN 1631844A). The reasons influencing the reduction of the service life of the ladle magnesia carbon brick are not only the severe use environment, the low purity of the electric fused magnesia as the main raw material and the low purity of the graphite material, but also the reaction of the magnesia and the graphite at high temperature, the smaller the granularity of the magnesia is, the easier the reaction with the graphite is, and a certain amount of magnesia fine powder is added into the conventional magnesia carbon brick.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a long-life ladle slag line brick which comprises 65-80% of an electric smelting magnesia material, 4-10% of an electric smelting calcium zirconate material, 3-10% of an electric smelting monoclinic zirconia material, 12-17% of a carbon material and 1-3% of an antioxidant, wherein the zirconia content of the electric smelting monoclinic zirconia material is more than 95%, and the antioxidant comprises one or more of metal aluminum, simple substance silicon and aluminum-silicon alloy powder.
The invention further defines the technical scheme that:
the granularity range of the fused magnesia material of the long-life ladle slag line brick is 5-0.5 mm.
The particle size range of the calcium zirconate material of the long-life ladle slag line brick is 0.5-0.1 mm.
The long-life ladle slag line brick has the particle size range of the electric melting monoclinic zirconia material of 0.1-0.045 mm.
The carbon content of the carbon material is more than 98%, and the particle size range is 0.2-0.083 mm.
The long-life ladle slag line brick is characterized in that the carbon material is crystalline flake graphite with the carbon content of more than 98%.
The granularity range of the antioxidant is less than 0.045 mm.
The invention also aims to provide a preparation method of the ladle slag line brick with long service life, which comprises the following steps:
a. adding fused magnesia with granularity grading of 5-3 mm, 3-1 mm and 1-0.5 mm, fused calcium zirconate with granularity of 0.5-0.1mm and flake graphite with granularity of 0.2-0.083mm into a mulling machine, and carrying out dry blending for 5-8 min at a mulling speed of 10-50 r/min;
b. adding the phenolic resin into a mixing machine, and continuously mixing for 5-10 min;
c. adding the electric melting monoclinic zirconia powder with the thickness of 0.1-0.045mm and the antioxidant with the thickness of less than 0.045mm into a mixing machine, and continuously mixing and grinding for 20-30 min to obtain a pre-pressing material;
d. and pressing and molding the pre-pressing material, and drying for 12 hours at 200-300 ℃ to obtain the slag line brick.
The beneficial effects of the invention are: the invention has excellent molten steel erosion resistance, high fluorine slag resistance, thermal shock resistance and oxidation resistance, has the characteristics of good erosion resistance and long service life when being used as the ladle slag line brick under the refining conditions of long-time LF furnace and VD furnace, and completely meets the requirements.
Detailed Description
The long-life ladle slag line bricks provided in examples 1 to 4 have the compositions shown in Table 1,
TABLE 1 ingredients (weight percentages) and characteristics of examples 1-4
Figure DEST_PATH_IMAGE002
The slag line brick can be prepared by using fused magnesia, fused calcium zirconate, fused monoclinic zirconia, carbon materials and other additives as raw materials through mixing, high-pressure forming and drying at the temperature lower than 300 ℃.
The fused magnesia particles and fine powder with the particle size of less than 0.5mm are not added, the reaction speed and the reaction amount of the magnesia and the carbon at high temperature are reduced, meanwhile, the fused calcium zirconate with the particle size of 0.5-0.1mm and the fused monoclinic zirconia powder with the particle size of 0.1-0.045mm are adopted, the continuous distribution of the particles is ensured, and the produced slag line brick has high density. The fused calcium zirconate and the fused monoclinic zirconia are more resistant to corrosion of the high-fluorine refining slag than the fused magnesia. Under the VD vacuum high-temperature smelting environment, the reaction of magnesia and carbon is much faster than that under the non-vacuum condition, and the service life of the magnesia carbon brick under the VD refining condition is much shorter than that of the magnesia carbon brick without the VD refining condition. After the small-particle fused magnesia and the fine powder are replaced by the fused calcium zirconate and the fused monoclinic zirconia, the reaction of the magnesia and the carbon in the slag line brick is reduced, the compact structure of the slag line brick is reserved, and the service life of the slag line brick is prolonged by about 30 percent compared with that of a magnesia carbon brick.
The steel ladle slag line brick has excellent molten steel erosion resistance, high fluorine slag resistance, thermal shock resistance and oxidation resistance, has the characteristics of good erosion resistance and long service life when being used as the steel ladle slag line brick under the refining conditions of a long-time LF furnace and a VD furnace, and completely meets the requirements.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides a long-life ladle slag line brick which characterized in that: the material comprises 65-80% of an electric smelting magnesia material, 4-10% of an electric smelting calcium zirconate material, 3-10% of an electric smelting monoclinic zirconia material, 12-17% of a carbon material, 1-3% of an antioxidant and 2-4% of a binding agent, wherein the zirconia content of the electric smelting monoclinic zirconia material is more than 95%, and the antioxidant comprises one or more of metal aluminum, simple substance silicon and aluminum-silicon alloy powder.
2. The long life ladle slag line brick as recited in claim 1, wherein: the particle size range of the fused magnesia material is 5-0.5 mm.
3. The long life ladle slag line brick as recited in claim 1, wherein: the particle size range of the calcium zirconate material is 0.5-0.1 mm.
4. The long life steel ladle slag line brick as claimed in claim 1, characterized in that: the particle size range of the electric melting monoclinic zirconia material is 0.1-0.045 mm.
5. The long life steel ladle slag line brick as claimed in claim 1, characterized in that: the carbon content of the carbon material is more than 98 percent, and the particle size range is 0.2-0.083 mm.
6. The long life steel ladle slag line brick as claimed in claim 1 or 5, wherein: the carbon material is crystalline flake graphite with the carbon content of more than 98 percent.
7. The long life ladle slag line brick as recited in claim 1, wherein: the antioxidant has a particle size range of less than 0.045 mm.
8. A preparation method of a ladle slag line brick with a long service life is characterized by comprising the following steps: use according to any one of claims 1 to 7, comprising the steps of:
a. adding fused magnesia with granularity grading of 5-3 mm, 3-1 mm and 1-0.5 mm, fused calcium zirconate with granularity of 0.5-0.1mm and flake graphite with granularity of 0.2-0.083mm into a mulling machine, and carrying out dry blending for 5-8 min at a mulling speed of 10-50 r/min;
b. adding the phenolic resin into a mixing machine, and continuously mixing for 5-10 min;
c. adding 0.1-0.045mm of electrofusion monoclinic zirconia powder and less than 0.045mm of antioxidant into a mixer, and continuously mixing and grinding for 20-30 min to obtain a pre-pressing material;
d. and pressing and molding the pre-pressing material, and drying for 12 hours at 200-300 ℃ to obtain the slag line brick.
CN202210503776.XA 2022-05-10 2022-05-10 Long-life ladle slag line brick and preparation method thereof Withdrawn CN114751757A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000095556A (en) * 1998-09-25 2000-04-04 Yotai Refractories Co Ltd Magnesia-carbon refractory material
CN110451932A (en) * 2019-08-27 2019-11-15 北京利尔高温材料股份有限公司 A kind of Ladle slag line magnesia carbon brick
CN112456975A (en) * 2020-12-22 2021-03-09 上海利尔耐火材料有限公司 Magnesia-carbon brick for high-alkalinity slag corrosion resistant ladle slag line and preparation method thereof
CN113402272A (en) * 2021-06-30 2021-09-17 江苏嘉耐高温材料股份有限公司 Calcium zirconate carbon brick

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000095556A (en) * 1998-09-25 2000-04-04 Yotai Refractories Co Ltd Magnesia-carbon refractory material
CN110451932A (en) * 2019-08-27 2019-11-15 北京利尔高温材料股份有限公司 A kind of Ladle slag line magnesia carbon brick
CN112456975A (en) * 2020-12-22 2021-03-09 上海利尔耐火材料有限公司 Magnesia-carbon brick for high-alkalinity slag corrosion resistant ladle slag line and preparation method thereof
CN113402272A (en) * 2021-06-30 2021-09-17 江苏嘉耐高温材料股份有限公司 Calcium zirconate carbon brick

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张广宇等: "MgO-CaZrO3 -ZrO2系含MgO复合陶瓷的结构与烧结性能", 《人工晶体学报》 *

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Application publication date: 20220715