CN107032806A - One kind produces converter body brick and preparation method thereof using black magnesia - Google Patents

One kind produces converter body brick and preparation method thereof using black magnesia Download PDF

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Publication number
CN107032806A
CN107032806A CN201710216389.7A CN201710216389A CN107032806A CN 107032806 A CN107032806 A CN 107032806A CN 201710216389 A CN201710216389 A CN 201710216389A CN 107032806 A CN107032806 A CN 107032806A
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Prior art keywords
particle
magnesia
parts
black
brick
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Inventor
曹阳
王新杰
张义先
尹斌
金钊
王健骁
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Haicheng Zhongxing High-Grade Magnesia Brick Co Ltd
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Haicheng Zhongxing High-Grade Magnesia Brick Co Ltd
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Priority to CN201710216389.7A priority Critical patent/CN107032806A/en
Publication of CN107032806A publication Critical patent/CN107032806A/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
    • C04B35/01—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
    • 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
    • C04B2235/34—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
    • C04B2235/3472—Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/40—Metallic constituents or additives not added as binding phase
    • 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
    • C04B2235/425—Graphite
    • 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
    • C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
    • 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
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/608—Green bodies or pre-forms with well-defined density
    • 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
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/61—Mechanical properties, e.g. fracture toughness, hardness, Young's modulus or strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

Converter body brick is produced using black magnesia, it is characterised in that the raw material including following parts by weight is prepared the present invention relates to one kind：35~50 parts of fused magnesite particle, black 20~30 parts of magnesia particle, 10~20 parts of fused magnesite fine powder, 1~3 part of alusil alloy powder, 1~2 part of carbide fine powder, 0~1 part of potassium feldspar fine powder, 12~14 parts of crystalline flake graphite, 2~3 parts of magnesium aluminate spinel, 2~4 parts of bonding agent phenolic resin.The fused magnesite of the invention matched somebody with somebody using variable grain level, black magnesia is primary raw materials, using phenolic resin as bonding agent, by adding compound additive, brick residual to magnesium carbon carries out secondary resource and made full use of, not only effectively reduce the cost and steel-making cost of refractory material, the mineral resources and the energy of country are saved simultaneously, reduce environmental pollution.

Description

One kind produces converter body brick and preparation method thereof using black magnesia
Technical field
The present invention relates to a kind of refractory material, one kind produces converter body brick and its preparation method using black magnesia.
Background technology
Black magnesia, also referred to as regeneration magnesia, is a kind of used refractory.At present, what China produced every year uses rear fire resisting Nearly 9,000,000 t of material.These waste refractory materials are often used by emergency burial or downshift, cause the wasting of resources and environmental pollution. If if these used refractories can be fully utilized as secondary resource, not only saving substantial amounts of resource for China, Especially improvement and environmental protection are played an important role.Therefore, used refractory is recycled not only to improving enterprise Benefit, social benefit and improvement environment are significant.And black magnesia be by being chosen, classified to used refractory and Special PROCESS FOR TREATMENT and the amorphous refractory being made.Refractory can be used to obtain fully by the way that black magnesia is made Recycle, you can save the mineral resources and the energy of country, and environmental pollution, the cost of significantly low refractory material can be reduced And steel-making cost.
The content of the invention
The technical problems to be solved by the invention are to provide one kind and produce converter body brick and its preparation method using black magnesia, Open pit mining is carried out to used refractory, the cost and steel-making cost of refractory material is reduced.
To achieve the above object, the present invention is realized using following technical scheme：
One kind produces converter body brick using black magnesia, is formulated by the raw material of following parts by weight：Fused magnesite 35~50 parts of particle, black 20~30 parts of magnesia particle, 10~20 parts of fused magnesite fine powder, 1~3 part of alusil alloy powder, carborundum 1~2 part of fine powder, 0~1 part of potassium feldspar fine powder, 12~14 parts of crystalline flake graphite, 2~3 parts of magnesium aluminate spinel, bonding agent phenolic resin 2 ~4 parts.
Described black magnesia particle is that with the residual brick particle of rear magnesium carbon, its physical and chemical index is：MgO >=70.5%, CaO≤ 2.10%, SiO2≤ 3.25%, FeO≤0.42%；Its particle fraction is：Less than the particle that 5mm is more than or equal to 3mm：5~8 parts, Less than the particle that 3mm is more than or equal to 1mm：10~25 parts, the particle less than 1mm more than or equal to 0.2mm：4~10 parts.
The fused magnesite particle, its grade has three kinds：12~18 parts of 5~3mm particle；3~1mm particle 15~28 Part；1~0mm particle：5~10 parts；The grade of fused magnesite fine powder is 200 mesh.
The physical and chemical index of described fused magnesite is：MgO >=97.5%, CaO≤1.5%, SiO2≤ 1.2%, Fe2O3≤ 0.6%, body is close >=3.45g/ ㎝3。
The grade of described crystalline flake graphite is 100 mesh, and the mass percent of its chemical constituent is：C >=96.0%.
The alusil alloy powder, its grade is 320 mesh；The mass percent of its chemical constituent is respectively：Purity >= 99.0%.
The carbide fine powder, its grade is 200 mesh, SiC >=97.0%.
The bonding agent is phenolic resin, and the mass percent and index of its chemical constituent are：Solid content >=80%, carbon residue >=46%, free phenol≤10%, moisture≤3.0%, pH value 6~7.
A kind of preparation method that converter body brick is produced using black magnesia, specific steps are included：
First step：Prepare black magnesia particle
1) classification pick will be carried out with the rear residual brick of magnesium carbon, residue therein, soil and other impurities are removed；
2) it will be crushed with the residual brick of rear magnesium carbon as the particle between 20~30mm；
3) the residual brick particle of magnesium carbon in step 2 is put into melting plant and heated, keep the temperature in melting plant to exist 1460 DEG C~1550 DEG C, the heat time is 5~7 hours；In heating process, the oxidation of impurities iron in particle is reduced with carbon Reaction, wherein carbon conversion are that carbon dioxide or carbon monoxide are discharged, and iron oxides impurity and the carbon in solution or are generated Reaction of carbon monoxide forms iron liquid in melting plant, and the iron liquid collector that iron liquid is melted bottom of device is collected；
4) aquation when the residual brick particle of step 3 being naturally cooled into 80~90 DEG C, hydration time is 7~8 hours；
5) by the residual brick particle drying after aquation, second-time breakage, be finely ground into black magnesia particle；
Second step：Dispensing
Raw material is weighed by converter body brick formula；
Third step：Shaping
First by carbide fine powder, alusil alloy powder, potassium feldspar fine powder and fused magnesite fine powder in vibromill it is dry-mixed It is even, common milling is made；In production, first the residual brick particle of fused magnesite particle and magnesium carbon is done as aggregate by above-mentioned parts by weight It is mixed 2~5 minutes, bonding agent disposably then was slowly added in 2~3 minutes, crystalline flake graphite is added afterwards and is mixed 1~2 minute, Discharged after being eventually adding common milling mixing 20~30 minutes, be then pressed into type；
Four steps：Heat treatment
Compressing semi-finished product, which enter, carries out heat treatment more than 24 hours in dry kiln, must not be high wherein entering kilneye temperature In 60 DEG C, baking time more than 8 hours, 110 DEG C of baking times more than 8 hours, 200~250 DEG C of baking times more than 8 hours；
5th step：Kiln discharge is chosen, and obtains converter body brick.
Compared with prior art, the beneficial effects of the invention are as follows：
1. the present invention removes iron during preparing black magnesia particle using melting plant, effectively remove with iron in the rear residual brick of magnesium carbon Iron tramp.Eliminate magnetic separation process.Hydration process is carried out to the residual brick of bulky grain using the residual temperature after high-temperature iron removing, saved Hydration time.Twice a day aquation under traditional full sized brick normal temperature, hydration time needs one week.Aluminium carbide clearance is high, makes black magnesia Quality is high.
2. there is the course of reaction between the slag and refractory material of complexity with the residual brick of rear magnesium carbon.Formation etc. low melting point phase adds The speed damage of material, but the formation of magnesium aluminate spinel effectively prevents the erosion and infiltration of molten iron and slag into brick, Improve the anti-scour property of brick.
3. the fused magnesite matched somebody with somebody using variable grain level, black magnesia is primary raw materials, using phenolic resin as bonding agent, by adding Adding composite additive, brick residual to magnesium carbon carries out secondary resource and made full use of, not only the effectively cost of reduction refractory material and refining Steel cost, while saving the mineral resources and the energy of country, reduces environmental pollution.
Embodiment
With reference to embodiment, the present invention is further described：
The present invention will be described in detail for following examples.These embodiments are only that preferred embodiment of the invention is entered Row description, is not limited the scope of the present invention.
Example example 1-3 produces converter body brick using black magnesia and uses dispensing component as shown in table 1；
Table 1：
Fused magnesite particle and black magnesia particle level, which are matched somebody with somebody, in embodiment 1-3 is shown in Table 2；
Table 2：
Black magnesia particle is that with the residual brick particle of rear magnesium carbon, its physical and chemical index is：MgO >=70.5%, CaO≤2.10%, SiO2≤ 3.25%, FeO≤0.42%.
The physical and chemical index of fused magnesite is：MgO >=97.5%, CaO≤1.5%, SiO2≤ 1.2%, Fe2O3≤ 0.6%, Body is close >=3.45g/ ㎝3。
The mass percent of described crystalline flake graphite chemical constituent is：C >=96.0%.
The mass percent of the metal alusil alloy efflorescence component is respectively：Purity >=99.0%.
Carborundum powder SiC >=97.0%.
The bonding agent is phenolic resin, and the mass percent and index of its chemical constituent are：Solid content >=80%, carbon residue >=46%, free phenol≤10%, moisture≤3.0%, pH value 6~7.
The black magnesia of utilization of embodiment 1 produces the preparation method of converter body brick, and specific steps include：
First step：Prepare black magnesia particle
1) classification pick will be carried out with the rear residual brick of magnesium carbon, residue therein, soil and other impurities are removed；
2) it will be crushed with the residual brick of rear magnesium carbon as the particle between 20~30mm；
3) the residual brick particle of magnesium carbon in step 2 is put into melting plant and heated, keep the temperature in melting plant to exist 1460 DEG C~1500 DEG C, the heat time is 6 hours；In heating process, with carbon reduction occurs for the oxidation of impurities iron in particle instead Should, wherein carbon conversion is that carbon dioxide or carbon monoxide are discharged, and iron oxides impurity and the carbon in solution or generated one Carbon dioxide reaction forms iron liquid in melting plant, and the iron liquid collector that iron liquid is melted bottom of device is collected；
4) aquation when the residual brick particle of step 3 being naturally cooled into 80~90 DEG C, hydration time is 8 hours；
5) by the residual brick particle drying after aquation, second-time breakage, be finely ground into black magnesia particle；
Second step：Dispensing
Raw material is weighed by converter body brick formula；
Third step：Shaping
First by carbide fine powder, alusil alloy powder, potassium feldspar fine powder and fused magnesite fine powder in vibromill it is dry-mixed It is even, common milling is made；In production, first the residual brick particle of fused magnesite particle and magnesium carbon is done as aggregate by above-mentioned parts by weight It is mixed 2~5 minutes, bonding agent disposably then was slowly added in 2~3 minutes, crystalline flake graphite is added afterwards and is mixed 1~2 minute, Discharged after being eventually adding common milling mixing 20~30 minutes, be then pressed into type；
Four steps：Heat treatment
Compressing semi-finished product, which enter, carries out heat treatment 24 hours in dry kiln, wherein 60 must not be higher than by entering kilneye temperature DEG C, baking time 8 hours, 110 DEG C of baking times 8 hours, 200~250 DEG C of baking times 8 hours；
5th step：Kiln discharge is chosen, and obtains converter body brick.
The main physical and chemical index of the present embodiment converter body brick is as follows：MgO：74.0%, bulk density after 200 DEG C of bakings 2.98g/cm3, apparent porosity (200 DEG C × 24h)：3.8%, compressive resistance (200 DEG C × 24h)：35MPa, Linear change rate (1600 DEG C × 3h) 0~1.0%.High temperature break resistant intensity (1400 × 0.5h)：12MPa.
The black magnesia of utilization of embodiment 2 produces the preparation method of converter body brick, and specific steps include：
First step：Prepare black magnesia particle
1) classification pick will be carried out with the rear residual brick of magnesium carbon, residue therein, soil and other impurities are removed；
2) it will be crushed with the residual brick of rear magnesium carbon as the particle between 20~25mm；
3) the residual brick particle of magnesium carbon in step 2 is put into melting plant and heated, keep the temperature in melting plant to exist 1500 DEG C~1550 DEG C, the heat time is 6 hours；In heating process, with carbon reduction occurs for the oxidation of impurities iron in particle instead Should, wherein carbon conversion is that carbon dioxide or carbon monoxide are discharged, and iron oxides impurity and the carbon in solution or generated one Carbon dioxide reaction forms iron liquid in melting plant, and the iron liquid collector that iron liquid is melted bottom of device is collected；
4) aquation when the residual brick particle of step 3 being naturally cooled into 80~90 DEG C, hydration time is 7 hours；
5) by the residual brick particle drying after aquation, second-time breakage, be finely ground into black magnesia particle；
Second step：Dispensing
Raw material is weighed by converter body brick formula；
Third step：Shaping
First by carbide fine powder, alusil alloy powder, potassium feldspar fine powder and fused magnesite fine powder in vibromill it is dry-mixed It is even, common milling is made；In production, first the residual brick particle of fused magnesite particle and magnesium carbon is done as aggregate by above-mentioned parts by weight It is mixed 2~5 minutes, bonding agent disposably then was slowly added in 2~3 minutes, crystalline flake graphite is added afterwards and is mixed 1~2 minute, Discharged after being eventually adding common milling mixing 20~30 minutes, be then pressed into type；
Four steps：Heat treatment
Compressing semi-finished product, which enter, carries out heat treatment 28 hours in dry kiln, wherein 60 must not be higher than by entering kilneye temperature DEG C, baking time 9 hours, 110 DEG C of baking times 10 hours, 200~250 DEG C of baking times 9 hours；
5th step：Kiln discharge is chosen, and obtains converter body brick.
The main physical and chemical index of the present embodiment converter body brick is as follows：MgO：74.65%,.Bulk density after 200 DEG C of bakings： 3.0g/cm3, apparent porosity (200 DEG C × 24h)：4%, compressive resistance (200 DEG C × 24h)：36MPa, (1600 DEG C of Linear change rate × 3h) 0~1.0%.High temperature break resistant intensity (1400 × 0.5h)：13MPa.
The black magnesia of utilization of embodiment 3 produces the preparation method of converter body brick, and specific steps include：
First step：Prepare black magnesia particle
1) classification pick will be carried out with the rear residual brick of magnesium carbon, residue therein, soil and other impurities are removed；
2) it will be crushed with the residual brick of rear magnesium carbon as the particle between 25~30mm；
3) the residual brick particle of magnesium carbon in step 2 is put into melting plant and heated, keep the temperature in melting plant to exist 1480 DEG C~1520 DEG C, the heat time is 7 hours；In heating process, with carbon reduction occurs for the oxidation of impurities iron in particle instead Should, wherein carbon conversion is that carbon dioxide or carbon monoxide are discharged, and iron oxides impurity and the carbon in solution or generated one Carbon dioxide reaction forms iron liquid in melting plant, and the iron liquid collector that iron liquid is melted bottom of device is collected；
4) aquation when the residual brick particle of step 3 being naturally cooled into 80~90 DEG C, hydration time is 7.5 hours；
5) by the residual brick particle drying after aquation, second-time breakage, be finely ground into black magnesia particle；
Second step：Dispensing
Raw material is weighed by converter body brick formula；
Third step：Shaping
First by carbide fine powder, alusil alloy powder, potassium feldspar fine powder and fused magnesite fine powder in vibromill it is dry-mixed It is even, common milling is made；In production, first the residual brick particle of fused magnesite particle and magnesium carbon is done as aggregate by above-mentioned parts by weight It is mixed 2~5 minutes, bonding agent disposably then was slowly added in 2~3 minutes, crystalline flake graphite is added afterwards and is mixed 1~2 minute, Discharged after being eventually adding common milling mixing 20~30 minutes, be then pressed into type；
Four steps：Heat treatment
Compressing semi-finished product, which enter, carries out heat treatment 30 hours in dry kiln, wherein 60 must not be higher than by entering kilneye temperature DEG C, baking time 10 hours, 110 DEG C of baking times 10 hours, 200~250 DEG C of baking times 10 hours；
5th step：Kiln discharge is chosen, and obtains converter body brick.
The main physical and chemical index of the present embodiment converter body brick is as follows：MgO：74.5%,.Bulk density after 200 DEG C of bakings： 3.2g/cm3, apparent porosity (200 DEG C × 24h)：3.95%, compressive resistance (200 DEG C × 24h)：40MPa, Linear change rate (1600 DEG C × 3h) 0~1.0%.High temperature break resistant intensity (1400 × 0.5h)：12MPa.

Claims (9)

1. one kind produces converter body brick using black magnesia, it is characterised in that the raw material including following parts by weight is prepared：Electric smelting 35~50 parts of magnesia particle, black 20~30 parts of magnesia particle, 10~20 parts of fused magnesite fine powder, 1~3 part of alusil alloy powder, carbon 1~2 part of SiClx fine powder, 0~1 part of potassium feldspar fine powder, 12~14 parts of crystalline flake graphite, 2~3 parts of magnesium aluminate spinel, bonding agent phenolic aldehyde 2~4 parts of resin.
2. one kind according to claim 1 produces converter body brick using black magnesia, it is characterised in that described black magnesia Particle is that with the residual brick particle of rear magnesium carbon, its physical and chemical index is：MgO >=70.5%, CaO≤2.10%, SiO2≤ 3.25%, FeO ≤ 0.42%；Its particle fraction is：Less than the particle that 5mm is more than or equal to 3mm：5~8 parts, less than 3mm more than or equal to 1mm Grain：10~25 parts, the particle less than 1mm more than or equal to 0.2mm：4~10 parts.
3. one kind according to claim 1 produces converter body brick using black magnesia, it is characterised in that the fused magnesite Particle, its grade has three kinds：12~18 parts of 5~3mm particle；15~28 parts of 3~1mm particle；1~0mm particle：5~ 10 parts；The grade of fused magnesite fine powder is 200 mesh.
4. one kind according to claim 1 produces converter body brick using black magnesia, it is characterised in that described electric-melting magnesium The physical and chemical index of sand is：MgO >=97.5%, CaO≤1.5%, SiO2≤ 1.2%, Fe2O3≤ 0.6%, body is close >=3.45g/ ㎝3。
5. one kind according to claim 1 produces converter body brick using black magnesia, it is characterised in that described scale stone The grade of ink is 100 mesh, and the mass percent of its chemical constituent is：C >=96.0%.
6. one kind according to claim 1 produces converter body brick using black magnesia, it is characterised in that the alusil alloy Powder, its grade is 320 mesh；The mass percent of its chemical constituent is respectively：Purity >=99.0%.
7. one kind according to claim 1 produces converter body brick using black magnesia, it is characterised in that the carborundum is thin Powder, its grade is 200 mesh, SiC >=97.0%.
8. a kind of converter body brick is produced according to claim 1 using black magnesia, it is characterised in that the bonding agent is Phenolic resin, the mass percent and index of its chemical constituent are：Solid content >=80%, carbon residue >=46%, free phenol≤10%, Moisture≤3.0%, pH value 6~7.
9. a kind of preparation method according to claim 1 that converter body brick is produced using black magnesia, it is characterised in that tool Body step includes：
First step：Prepare black magnesia particle
1) classification pick will be carried out with the rear residual brick of magnesium carbon, residue therein, soil and other impurities are removed；
2) it will be crushed with the residual brick of rear magnesium carbon as the particle between 20~30mm；
3) the residual brick particle of magnesium carbon in step 2 is put into melting plant and heated, keep the temperature in melting plant at 1460 DEG C ~1550 DEG C, the heat time is 5~7 hours；In heating process, with carbon reduction reaction occurs for the oxidation of impurities iron in particle, Wherein carbon conversion is that carbon dioxide or carbon monoxide are discharged, and iron oxides impurity and the carbon in solution or the oxidation generated Carbon reaction forms iron liquid in melting plant, and the iron liquid collector that iron liquid is melted bottom of device is collected；
4) aquation when the residual brick particle of step 3 being naturally cooled into 80~90 DEG C, hydration time is 7~8 hours；
5) by the residual brick particle drying after aquation, second-time breakage, be finely ground into black magnesia particle；
Second step：Dispensing
Raw material is weighed by converter body brick formula；
Third step：Shaping
First by carbide fine powder, alusil alloy powder, potassium feldspar fine powder and fused magnesite fine powder in vibromill dry-mixed uniform, system Into common milling；In production, first using fused magnesite particle and the residual brick particle of magnesium carbon as aggregate by above-mentioned parts by weight dry-mixed 2~ 5 minutes, bonding agent disposably then was slowly added in 2~3 minutes, crystalline flake graphite mixing 1~2 minute is added afterwards, finally Add milling mixing altogether to discharge after 20~30 minutes, be then pressed into type；
Four steps：Heat treatment
Compressing semi-finished product, which enter, carries out heat treatment more than 24 hours in dry kiln, wherein 60 must not be higher than by entering kilneye temperature DEG C, baking time more than 8 hours, 110 DEG C of baking times more than 8 hours, 200~250 DEG C of baking times more than 8 hours；
5th step：Kiln discharge is chosen, and obtains converter body brick.
CN201710216389.7A 2017-04-05 2017-04-05 One kind produces converter body brick and preparation method thereof using black magnesia Pending CN107032806A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108440009A (en) * 2018-05-10 2018-08-24 苏州佳耐材料科技有限公司 A method of addition silicon carbide whisker prepares high-performance magnesia carbon brick
CN109809808A (en) * 2017-11-20 2019-05-28 鞍山市和丰耐火材料有限公司 A kind of smelting fine work steel invades performance magnesia-spinel brick and preparation method thereof with resistance to slag

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JP2000313675A (en) * 1999-04-26 2000-11-14 Asahi Glass Co Ltd Castable refractory, and waste-melting furnace
CN103789467A (en) * 2014-02-19 2014-05-14 中冶建筑研究总院有限公司 Method for carrying out remelting, reduction and modification treatment on massive steel slag
CN105622070A (en) * 2015-12-31 2016-06-01 海城市中兴高档镁质砖有限公司 Magnesia-carbon brick prepared from residual magnesia-carbon bricks and preparation method of magnesia-carbon brick
CN105859307A (en) * 2016-03-30 2016-08-17 重庆钢铁(集团)有限责任公司 Method for processing and recovering carboniferous waste fireproof materials
CN106431437A (en) * 2016-09-26 2017-02-22 北京利尔高温材料股份有限公司 Ladle slag line magnesia carbon brick as well as preparation and application thereof

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JP2000313675A (en) * 1999-04-26 2000-11-14 Asahi Glass Co Ltd Castable refractory, and waste-melting furnace
CN103789467A (en) * 2014-02-19 2014-05-14 中冶建筑研究总院有限公司 Method for carrying out remelting, reduction and modification treatment on massive steel slag
CN105622070A (en) * 2015-12-31 2016-06-01 海城市中兴高档镁质砖有限公司 Magnesia-carbon brick prepared from residual magnesia-carbon bricks and preparation method of magnesia-carbon brick
CN105859307A (en) * 2016-03-30 2016-08-17 重庆钢铁(集团)有限责任公司 Method for processing and recovering carboniferous waste fireproof materials
CN106431437A (en) * 2016-09-26 2017-02-22 北京利尔高温材料股份有限公司 Ladle slag line magnesia carbon brick as well as preparation and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109809808A (en) * 2017-11-20 2019-05-28 鞍山市和丰耐火材料有限公司 A kind of smelting fine work steel invades performance magnesia-spinel brick and preparation method thereof with resistance to slag
CN108440009A (en) * 2018-05-10 2018-08-24 苏州佳耐材料科技有限公司 A method of addition silicon carbide whisker prepares high-performance magnesia carbon brick

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Application publication date: 20170811