CN110451932A - A kind of Ladle slag line magnesia carbon brick - Google Patents
A kind of Ladle slag line magnesia carbon brick Download PDFInfo
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- CN110451932A CN110451932A CN201910799678.3A CN201910799678A CN110451932A CN 110451932 A CN110451932 A CN 110451932A CN 201910799678 A CN201910799678 A CN 201910799678A CN 110451932 A CN110451932 A CN 110451932A
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- magnesia carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- 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
- C04B2235/70—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
Abstract
The invention discloses a kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 15-25 parts of fused magnesite of 3mm≤granularity < 5mm；25-35 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 15-25 parts of fused magnesite of 1mm；13-15 parts of flaky graphite；1-3 parts of bonding agent (phenolic resin)；0-8 parts of additive (alumina powder) (does not include 0 part).The present invention improves the difference that refractory brick corner intensity is low, center intensity is high, to improve corner improved strength ladle slag line brick steamed bun shape, masonry is alternateed by label is positive and negative to brick progress when building, brickwork joint is influenced with reducing depanning slightly, to mitigate clinker to residue pile corner erosion, magnesia particles of aggregates is closely combined with crystalline flake graphite, enhances the Ceramic bond of material matrix, materials microstructure is improved, to improve intensity.
Description
Technical field
The invention belongs to magnesia carbon brick technical field, specially a kind of Ladle slag line magnesia carbon brick.
Background technique
Magnesia carbon brick is with high-melting-point alkalinity oxides magnesium (2800 DEG C of fusing point) and to be difficult to be invaded the high-melting-point of profit by clinker
Carbon materials add various non-oxidized substance additives as raw material, do not burn carbon composite fire with what carbonaceous bonding agent was combined into
Material.Magnesia carbon brick be mainly used for converter, ac arc furnace, direct current electric arc furnace liner, the positions such as slag line of ladle；
Current magnesia carbon brick residue pile corner etching problem is serious, and brick strength is lower, magnesia carbon brick in process, by
In resistance of the pug by mould template, lead to pug unbalance stress, keeps the residue pile steamed bun shape phenomenon of magnesia carbon brick serious, it is unfavorable
In use,.
Summary of the invention
It is an object of the invention to solve the problems in background technique, a kind of Ladle slag line magnesia carbon brick is provided.
The technical solution adopted by the invention is as follows:
A kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 3mm≤granularity < 5mm fused magnesite
15-25 parts；25-35 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 15-25 parts of fused magnesite of 1mm；Flakey stone
It is 13-15 parts black；1-3 parts of bonding agent (phenolic resin)；0-8 parts of additive (alumina powder) (does not include 0 part).
Wherein, the physical and chemical index of the fused magnesite sum: MgO >=97.5, CaO≤1.6, SiO2≤1.4, Fe2O3≤
0.8, bulk density >=3.45g/cm3；The granularity of flaky graphite is less than 0.088mm, wherein carbon containing mass percent are as follows: and C >=
93.0%；Bonding agent (phenolic resin) is phenolic resin, physical and chemical index are as follows: solid content >=80%, carbon residue >=46%, free phenol
≤ 10%, moisture≤3.0%, pH value 6-7；Additive (alumina powder) is silicon powder, aluminium powder, silicon powder-aluminium powder composite powder, oxidation
The mixtures of the one or more of aluminium micro mist, asphalt powder, silicon carbide, boron carbide, magnesium aluminum-alloy powder, grade≤320 mesh.
Wherein, the corner of the magnesia carbon brick using material is taken off in quadrangle, material is pressed on four sides, shakeout after press brick again.
Wherein, the magnesia carbon brick end is equipped with label.
A kind of preparation method of Ladle slag line magnesia carbon brick, it is characterised in that: the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, it is standby that total milling is made
With by each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weighs up spare according to the ratio；
2): the fused magnesite in step 1 being mixed with phenolic resin, fine powder is added and flaky graphite mixing is stirred
It mixes, discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, to complete the preparation to slag line brick for ladle.
Wherein, at 40-50 DEG C, the process time of step 2 controlled at 30 minutes the mixing stability contorting of the step 2
Within.
Wherein, the position that the brick machine upper cover plate of the production magnesia carbon brick corresponds to magnesia carbon brick is welded with a length of 3-5mm, diameter
For 4.5-5.5mm small column.
Wherein, the step 4 from room temperature to 110 DEG C heat time be 8h, from 110 DEG C be heated to 200 DEG C heating when
Between be 8h, then 200 DEG C of heat preservation 6h, then kiln discharge sorting.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
In the present invention, material is taken off by quadrangle, material is pressed on four sides, shakeout after press the principle of brick again, alleviate pug by mold
The resistance of template improves the difference that refractory brick corner intensity is low, center intensity is high, to improve corner improved strength ladle slag line
Brick steamed bun shape alternates masonry by label is positive and negative to brick progress when building, to reduce depanning slightly by the way that brick is marked
Brickwork joint is influenced, to mitigate clinker to residue pile corner erosion；When introducing aluminium oxide enters micro mist in magnesia carbon brick, due to oxidation
Aluminium micro mist good dispersion, the spinelle that reaction in-situ generates under alumina powder and magnesia high temperature in matrix is in continuous point
Magnesia particles of aggregates is closely combined with crystalline flake graphite, enhances the Ceramic bond of material matrix, improve material by cloth
Institutional framework is expected, to improve intensity.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
Embodiment 1:
A kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 3mm≤granularity < 5mm fused magnesite
25 parts；25 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 20 parts of fused magnesite of 1mm；13 parts of flaky graphite；Knot
2 parts of mixture (phenolic resin)；6 parts of additive (alumina powder).
The preparation method of above-mentioned Ladle slag line magnesia carbon brick the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, it is standby that total milling is made
With by each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weighs up spare according to the ratio；
2): the fused magnesite in step 1 being mixed with phenolic resin, fine powder is added and flaky graphite mixing is stirred
It mixes, discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, and completes the preparation to slag line brick for ladle.
Embodiment 2:
A kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 3mm≤granularity < 5mm fused magnesite
25 parts；25 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 18 parts of fused magnesite of 1mm；14 parts of flaky graphite；Knot
3 parts of mixture (phenolic resin)；4 parts of additive (alumina powder).
The preparation method of above-mentioned Ladle slag line magnesia carbon brick the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, it is standby that total milling is made
With by each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weighs up spare according to the ratio；
2): the fused magnesite in step 1 being mixed with phenolic resin, fine powder is added and flaky graphite mixing is stirred
It mixes, discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, and completes the preparation to slag line brick for ladle.
Embodiment 3:
A kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 3mm≤granularity < 5mm fused magnesite
20 parts；30 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 20 parts of fused magnesite of 1mm；14 parts of flaky graphite；Knot
2 parts of mixture (phenolic resin)；3 parts of additive (alumina powder).
The preparation method of above-mentioned Ladle slag line magnesia carbon brick the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, it is standby that total milling is made
With by each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weighs up spare according to the ratio；
2): the fused magnesite in step 1 being mixed with phenolic resin, fine powder is added and flaky graphite mixing is stirred
It mixes, discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, and completes the preparation to slag line brick for ladle.
Embodiment 4；
A kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 3mm≤granularity < 5mm fused magnesite
20 parts；30 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 18 parts of fused magnesite of 1mm；14 parts of flaky graphite；Knot
3 parts of mixture (phenolic resin)；5 parts of additive (alumina powder).
The preparation method of above-mentioned Ladle slag line magnesia carbon brick the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, it is standby that total milling is made
With by each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weighs up spare according to the ratio；
2): the fused magnesite in step 1 being mixed with phenolic resin, fine powder is added and flaky graphite mixing is stirred
It mixes, discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, and completes the preparation to slag line brick for ladle.
Embodiment 5:
A kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 3mm≤granularity < 5mm fused magnesite
25 parts；25 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 20 parts of fused magnesite of 1mm；15 parts of flaky graphite；Knot
3 parts of mixture (phenolic resin)；1 part of additive (alumina powder).
The preparation method of above-mentioned Ladle slag line magnesia carbon brick the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, it is standby that total milling is made
With by each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weighs up spare according to the ratio；
2): the fused magnesite in step 1 being mixed with phenolic resin, fine powder is added and flaky graphite mixing is stirred
It mixes, discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, and completes the preparation to slag line brick for ladle.
Embodiment 6:
A kind of Ladle slag line magnesia carbon brick, consist of the following raw materials in parts by weight: 3mm≤granularity < 5mm fused magnesite
20 parts；30 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 20 parts of fused magnesite of 1mm；15 parts of flaky graphite；Knot
3 parts of mixture (phenolic resin)；1 part of additive (alumina powder).
The preparation method of above-mentioned Ladle slag line magnesia carbon brick the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, it is standby that total milling is made
With by each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weighs up spare according to the ratio；
2): the fused magnesite in step 1 being mixed with phenolic resin, fine powder is added and flaky graphite mixing is stirred
It mixes, discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, and completes the preparation to slag line brick for ladle.
By test thermal shock resistance, (1-5 grades, be the Ladle slag line magnesia carbon brick produced by above-mentioned 6 embodiments greater than 3 grades
Thermal shock resistance is fine) obtain following table:
Therefore embodiment 2 is preferred embodiment.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of Ladle slag line magnesia carbon brick, it is characterised in that: by the raw material of following parts by weight: 3mm≤granularity < 5mm electric smelting
15-25 parts of magnesia；25-35 parts of fused magnesite of 1mm≤granularity < 3mm；Granularity is less than 15-25 parts of fused magnesite of 1mm；Scale
13-15 parts of shape graphite；1-3 parts of bonding agent (phenolic resin)；0-8 parts of additive (alumina powder) (does not include 0 part).
2. a kind of Ladle slag line magnesia carbon brick as described in claim 1, it is characterised in that: the physics and chemistry of the fused magnesite sum refers to
Mark: MgO >=97.5, CaO≤1.6, SiO2≤1.4, Fe2O3≤0.8, bulk density >=3.45g/cm3；The grain of flaky graphite
Degree is less than 0.088mm, wherein carbon containing mass percent are as follows: C >=93.0%；Bonding agent (phenolic resin) is phenolic resin, reason
Change index are as follows: solid content >=80%, carbon residue >=46%, free phenol≤10%, moisture≤3.0%, pH value 6-7；Additive (oxidation
Aluminium micro mist) it is silicon powder, aluminium powder, silicon powder-aluminium powder composite powder, alumina powder, asphalt powder, silicon carbide, boron carbide, magnesium aluminum-alloy powder
One or more kinds of mixtures, grade≤320 mesh.
3. a kind of Ladle slag line magnesia carbon brick as described in claim 1, it is characterised in that: the corner of the magnesia carbon brick uses quadrangle
Take off material, material is pressed on four sides, shakeout after press brick again.
4. a kind of Ladle slag line magnesia carbon brick as described in claim 1, it is characterised in that: the magnesia carbon brick end is equipped with label.
5. a kind of preparation method of Ladle slag line magnesia carbon brick as described in claim 1, it is characterised in that: the following steps are included:
1): additive (alumina powder) and fused magnesite fine powder is dry-mixed uniform in vibromill, total spare, the general that is milled is made
Each granularity magnesia, bonding agent (phenolic resin), additive (alumina powder) weigh up spare according to the ratio；
2): the fused magnesite in step 1 is mixed with phenolic resin, fine powder is added and flaky graphite is mixed,
It discharges after being eventually adding total milling mixed at high speed 8-12min- mixed on low speed 10-15min；
3): material is taken off in quadrangle, material is pressed in quadrangle, high-pressure molding, heavy after first light, while mark being marked；
4): being heat-treated with tunnel oven, kiln discharge sorts, and completes the preparation to slag line brick for ladle.
6. a kind of preparation method of Ladle slag line magnesia carbon brick as claimed in claim 5, it is characterised in that: the step 2 is mixed
Stirring stability contorting is closed at 40-50 DEG C, the process time of step 2 controlled within 30 minutes.
7. a kind of preparation method of Ladle slag line magnesia carbon brick as claimed in claim 5, it is characterised in that: the production magnesia carbon brick
Brick machine upper cover plate correspond to the position of magnesia carbon brick and be welded with a length of 3-5mm, diameter is 4.5-5.5mm small column.
8. a kind of preparation method of Ladle slag line magnesia carbon brick as claimed in claim 5, it is characterised in that: the step 4 is from normal
The time that temperature is heated to 110 DEG C is 8h, and the time that 200 DEG C of heating are heated to from 110 DEG C is 8h, then 200 DEG C of heat preservation 6h, then is gone out
Kiln sorts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910799678.3A CN110451932A (en) | 2019-08-27 | 2019-08-27 | A kind of Ladle slag line magnesia carbon brick |
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| CN201910799678.3A CN110451932A (en) | 2019-08-27 | 2019-08-27 | A kind of Ladle slag line magnesia carbon brick |
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Cited By (8)
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| CN111517761A (en) * | 2020-04-16 | 2020-08-11 | 北京利尔高温材料股份有限公司 | Composite lining material and application method thereof |
| CN112125650A (en) * | 2020-09-28 | 2020-12-25 | 北京利尔高温材料股份有限公司 | Magnesia carbon brick for vicinity of electric furnace door and preparation method thereof |
| CN112250421A (en) * | 2020-09-28 | 2021-01-22 | 北京利尔高温材料股份有限公司 | Magnesia carbon brick for impact area of converter and preparation method thereof |
| CN112479684A (en) * | 2020-11-27 | 2021-03-12 | 云南濮耐昆钢高温材料有限公司 | Magnesium carbon brick for hot spot area of furnace wall of electric arc furnace |
| CN114751757A (en) * | 2022-05-10 | 2022-07-15 | 江苏嘉耐高温材料股份有限公司 | Long-life ladle slag line brick and preparation method thereof |
| CN115340362A (en) * | 2022-08-30 | 2022-11-15 | 宜兴市耐火材料有限公司 | Alumina fiber reinforced magnesia carbon sliding plate and preparation process thereof |
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| CN117362056A (en) * | 2023-12-07 | 2024-01-09 | 山东海泰高温材料有限公司 | Preparation method and application of magnesia carbon brick for steel ladle |
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| CN111517761A (en) * | 2020-04-16 | 2020-08-11 | 北京利尔高温材料股份有限公司 | Composite lining material and application method thereof |
| CN112125650A (en) * | 2020-09-28 | 2020-12-25 | 北京利尔高温材料股份有限公司 | Magnesia carbon brick for vicinity of electric furnace door and preparation method thereof |
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| CN116410008A (en) * | 2023-04-24 | 2023-07-11 | 鞍山市和丰耐火材料有限公司 | Long-service-life low-carbon magnesia carbon brick and preparation method thereof |
| CN117362056A (en) * | 2023-12-07 | 2024-01-09 | 山东海泰高温材料有限公司 | Preparation method and application of magnesia carbon brick for steel ladle |
| CN117362056B (en) * | 2023-12-07 | 2024-02-20 | 山东海泰高温材料有限公司 | Preparation method and application of magnesia carbon brick for steel ladle |
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Application publication date: 20191115 |