CN1297861A - Refractory material for working layer of intermediate ladle - Google Patents

Refractory material for working layer of intermediate ladle Download PDF

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Publication number
CN1297861A
CN1297861A CN99112577A CN99112577A CN1297861A CN 1297861 A CN1297861 A CN 1297861A CN 99112577 A CN99112577 A CN 99112577A CN 99112577 A CN99112577 A CN 99112577A CN 1297861 A CN1297861 A CN 1297861A
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CN
China
Prior art keywords
percent
magnesite
fine powder
weight ratio
working layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN99112577A
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Chinese (zh)
Inventor
李庆林
任学华
赵萍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGDONG EMEI GROUP CO Ltd
Original Assignee
SHANGDONG EMEI GROUP CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANGDONG EMEI GROUP CO Ltd filed Critical SHANGDONG EMEI GROUP CO Ltd
Priority to CN99112577A priority Critical patent/CN1297861A/en
Publication of CN1297861A publication Critical patent/CN1297861A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—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
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C04B28/344—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Ceramic Products (AREA)

Abstract

The present invention relates to the field of smelting technology. The refractory material mainly for the working layer of intermediate steel ladle contains granular magnesite part of different sizes in 45-87 wt% and powdered magnesite part. It has high structure strength, high heat stability and high erosion resistance and its use can prolong the service life of intermediate ladle greatly.

Description

Refractory material for working layer of tundish
The invention relates to the technical field of smelting, in particular to a refractory material mainly used for a working layer of a steelmaking tundish.
The existing tundish working layer adopts refractory materials which mainly comprise magnesium and siliceous heat insulation plates, magnesium coating materials and the like. The common deficiency of these materials is: the service life is short, generally about 8 hours, the requirement of high-efficiency continuous casting cannot be met, and the safety is poor; breakout accidents and the like often occur. The reason is mainly determined by the following points: because the organic bonding agent is adopted for forming, a large numberof air holes are left in the heating process, and the structural compactness is poor; the main material has poor thermal stability, the structural strength is further reduced along with the rise of temperature, and when the main material is contacted with molten steel, the molten steel and steel slag quickly invade the interior of the material to be corroded and damaged; the overall design of the material has the defect that Ca in the steel slag is not in contact with the steel2+、Fe3+、Al3+、Si4+The elements are diffused into the material to react with the material to generate a low-melting-point phase which is dissolved in slag, so that the corrosion of the material is accelerated.
The invention aims to ensure that only the material has high structural strength and good thermal stability in the whole using process by adding the inorganic bonding agent. And through the fine integral design, the optimized combination among all the groups of the materials is achieved, the erosion resistance is high, and the service life of the working layer of the tundish is greatly prolonged. The invention provides a technical scheme for achieving the aim, which comprises a magnesite grain part and a magnesite fine powder part, wherein the weight ratio of different grain diameters of the magnesite grain part is 45-87%,
the magnesite fine powder part comprises the following components in percentage by weight:
the components are as follows: the weight ratio is as follows:
20 to 30 percent of magnesia fine powder
Active SiO21.5-6％Quartz 1-5%, active MgO 0.5-4%, steel fiber 0.6-1.6%, sodium tripolyphosphate 0.1-0.3%, sodium hexametaphosphate 0.1-0.3%, magnesia particles, and the weight ratio of different particle diametersis as follows: the different weight ratios of the different particle diameters of 5-8mm 12-22% 3-5mm 13-23% 1-3mm 12-22% 0.1-1mm 10-20% first-grade fused magnesia particles are as follows: the weight ratio of the particle diameter to the fine powder of the magnesite grains is 5-8mm, 19%, 3-5mm, 15%, 1-3mm, 14%, 0.1-1mm, 17%, and the weight ratio is as follows: the weight percentage of the components is that the first-grade fused magnesia fine powder is 200 meshes, the sand content is 24 percent, and the sand content is 4 percent320 meshes of sintered magnesite, 2 percent of sulfosand, 0-2mm of sintered magnesite, 3 percent of steel fiber, 1.6 percent of sodium tripolyphosphate, 0.2 percent of sodium hexametaphosphate, 0.2 percent of sintered magnesiteThe content of Mgo in the refractory material is 80-95%.
The invention adds active SiO2Quartz and steel fibers, and improves the volume stability of the material. As the magnesium material has larger thermal expansion in the heating process, the structure of the material is easy to damage, the strength is reduced, and the performance is reduced. Adding active Sio2Quartz, which facilitates the Mgo reaction at a lower temperature, and due to the difference in activity, the reaction temperature range is large, so that M is continuously generated2S enhances the strength; SiO at about 1300 DEG C2The molten magnesium alloy is melted into a high-viscosity glass phase, and the thermal expansion of the magnesium material is buffered. The steel fiber is arranged in the material in a staggered way at the medium and low temperature to play a role in strengthening, and is gradually melted and oxidized to form fine gaps at the temperature of more than 1350 ℃, so that the steel fiber plays a good role in eliminating expansion stress and improving thermal shock.
The addition of sodium tripolyphosphate and sodium hexametaphosphate greatly reduces the repulsive force of the materials and water, so that the materials form a suspension with good flow under the condition of adding a small amount of water, and the performances of the materials in all aspects are obviously improved.
Erosion of the material occurs mainly at the slag line, i.e. immersion of the slag. The slag mainly comprises CaO and SiO2、Al2O3、Fe2O3Their diffusion rate inside the material is Ca2+＞Al3+＞Fe3+＞Si4+. The invention adjusts the proportion of each chemical component of the material to lead Ca to be used as2+、Al3+、Fe3+、Si4+When the material is invaded, the material is immediately captured by the material to regenerate a high-temperature phase, so that the performance of the material can be kept stable for a longer time. When Ca is present2+When the material is invaded, the C/S ratio can be controlled to ensure that the C/S is less than or equal to 1 and the phase is still at M2S + M is the main component; al (Al)3+At the time of intrusion, M+A→MAFe3+When the water enters the water tank, the water tank is immersed, ；Si4+continue to generate M with M2And S. The integral design enables the material to obtain better erosion resistance.
Through experiments, the invention has the advantages that the pressure resistance reaches 130Mpa and the body density (g/Cm) is high at 110 ℃ for 24 hours3) 2.9, 1550C multiplied by 3 hours, the pressure resistance reaches 80Mpa, and the volume density (g/Cm)3) At 2.7, the line variation is: + 0.07%, hourly erosion: 0.1. the experimental data show that the invention has the advantages of high structural strength, good thermal stability, high erosion resistance, capability of greatly prolonging the service life of the tundish and the like.
The embodiment of the invention comprises the following steps: the refractory material of the invention contains a magnesia particle part and a magnesia fine powder part, and the concrete contents are as follows: the different weight ratios of the different particle diameters of the primary fused magnesia particle part are as follows: the weight ratio of the particle diameter to the fine powder of the magnesite grains is 5-8mm, 19%, 3-5mm, 15%, 1-3mm, 14%, 0.1-1mm, 17%, and the weight ratio is as follows: the invention is made by adopting the known technology in the field, wherein the weight ratio of the components is that first-grade fused magnesia fine powder is 200 meshes, 24 percent sand ash is 4 percent sintered magnesia is 320 meshes, 2 percent sulfosand is 0-2mm 3 percent steel fiber is 1.6 percent sodium tripolyphosphate is 0.2 percent sodium hexametaphosphate is 0.2 percent.

Claims (3)

1. The tundish working layer refractory material is characterized in that: it comprises a magnesite particle part and a magnesite fine powder part, wherein the weight ratio of different particle diameters of the magnesite particle part is 45-87%,
the magnesite fine powder part comprises the following components in percentage by weight:
the components are as follows: the weight ratio is as follows:
20 to 30 percent of magnesia fine powder
Active SiO21.5-6％
1 to 5 percent of quartz
Active MgO 0.5-4%
Steel fiber 0.6-1.6%
Sodium tripolyphosphate 0.1-0.3%
Sodium hexametaphosphate 0.1-0.3%
2. The tundish working layer refractory of claim 1, wherein: the weight ratio of different particle diameters of the magnesite grain part is as follows:
particle diameter to weight ratio
5-8mm 12-22％
3-5mm 13-23％
1-3mm 12-22％
0.1-1mm 10-20％
3. The tundish working layer refractory of claim 1, wherein: the different weight ratios of the different particle diameters of the primary fused magnesia particle part are as follows:
particle diameter to weight ratio
5-8mm 19％
3-5mm 15％
1-3mm 14％
0.1-1mm 17％
The magnesite fine powder part comprises the following components in percentage by weight:
the weight ratio of the components
200 meshes of first-grade fused magnesia fine powder and 24 percent of the first-grade fused magnesia fine powder
4 percent of sand ash
320 mesh 2% of sintered magnesia
0-2mm 3% of sand
1.6 percent of steel fiber
Sodium tripolyphosphate 0.2%
0.2 percent of sodium hexametaphosphate
CN99112577A 1999-11-29 1999-11-29 Refractory material for working layer of intermediate ladle Pending CN1297861A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN99112577A CN1297861A (en) 1999-11-29 1999-11-29 Refractory material for working layer of intermediate ladle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN99112577A CN1297861A (en) 1999-11-29 1999-11-29 Refractory material for working layer of intermediate ladle

Publications (1)

Publication Number Publication Date
CN1297861A true CN1297861A (en) 2001-06-06

Family

ID=5275869

Family Applications (1)

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CN99112577A Pending CN1297861A (en) 1999-11-29 1999-11-29 Refractory material for working layer of intermediate ladle

Country Status (1)

Country Link
CN (1) CN1297861A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100339170C (en) * 2005-10-14 2007-09-26 河北理工大学 Dry type working liner material for erosion resistance continuous casting tundish
CN101502877B (en) * 2009-02-27 2010-10-13 莱芜钢铁股份有限公司 Baffle for special-shaped blank continuous casting machine tundish and preparation method thereof
CN102672155A (en) * 2012-04-17 2012-09-19 柳亚成 Iron ladle
CN104311076A (en) * 2014-10-13 2015-01-28 濮阳濮耐高温材料（集团）股份有限公司 Anti-permeation type tundish light coating and preparation method thereof
CN110272292A (en) * 2019-08-12 2019-09-24 瑞泰马钢新材料科技有限公司 A kind of magnesia coating of tundish and preparation method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100339170C (en) * 2005-10-14 2007-09-26 河北理工大学 Dry type working liner material for erosion resistance continuous casting tundish
CN101502877B (en) * 2009-02-27 2010-10-13 莱芜钢铁股份有限公司 Baffle for special-shaped blank continuous casting machine tundish and preparation method thereof
CN102672155A (en) * 2012-04-17 2012-09-19 柳亚成 Iron ladle
CN104311076A (en) * 2014-10-13 2015-01-28 濮阳濮耐高温材料（集团）股份有限公司 Anti-permeation type tundish light coating and preparation method thereof
CN104311076B (en) * 2014-10-13 2016-03-02 濮阳濮耐高温材料（集团）股份有限公司 A kind of impermeabilisation type tundish light paint and preparation method thereof
CN110272292A (en) * 2019-08-12 2019-09-24 瑞泰马钢新材料科技有限公司 A kind of magnesia coating of tundish and preparation method thereof

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