CN114749646B - Composite steel ladle free of calcium treatment process - Google Patents
Composite steel ladle free of calcium treatment process Download PDFInfo
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- CN114749646B CN114749646B CN202210355690.7A CN202210355690A CN114749646B CN 114749646 B CN114749646 B CN 114749646B CN 202210355690 A CN202210355690 A CN 202210355690A CN 114749646 B CN114749646 B CN 114749646B
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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
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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
- C04B35/10—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 aluminium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- 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
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a composite steel ladle free of a calcium treatment process, and belongs to the technical field of steelmaking production equipment in the metallurgical industry. The technical proposal is as follows: the wall-wrapping working layer is formed by building aluminum magnesia carbon bricks (6) and wall-wrapping magnesia-free bricks (7), and the wall-wrapping magnesia-free bricks comprise the following chemical components in percentage by mass: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the apparent porosity is less than or equal to 10 percent, and the compressive strength is more than or equal to 80MPa; the bottom-covered working layer (8) is formed by laying bottom-covered magnesia-free bricks, and the bottom-covered magnesia-free bricks comprise the following chemical components in percentage by mass: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the apparent porosity is less than or equal to 10 percent, and the compressive strength is more than or equal to 80MPa. The beneficial effects of the invention are as follows: the method can effectively block the mutual reaction of Al in molten steel and MgO in the aluminum-magnesia carbon bricks, improve the cleanliness of the molten steel and ensure the castability of the molten steel.
Description
Technical Field
The invention relates to a composite steel ladle free of a calcium treatment process, and belongs to the technical field of steelmaking production equipment in the metallurgical industry.
Background
The aluminum-magnesia carbon brick steel ladle is a steel ladle commonly used for steel making and pouring, al in the steel liquid can generate magnesia-alumina spinel inclusions with high melting point with MgO in the steel ladle brick and slag in the molten steel smelting process, and the magnesia-alumina spinel inclusions gather at a stopper rod flow control part to cause the rising of a stopper rod, influence the casting stability and cause the interruption of casting when serious. Therefore, calcium treatment processes are often employed to solve the problem of the castability of molten steel. However, the existing calcium treatment process has the problems of unstable calcium wire yield, prolonged smelting period, increased cost, environmental protection and the like. Therefore, some steel mills have begun to use a calcium-free treatment process for some steel grades, which places higher demands on the cleanliness of the molten steel.
Disclosure of Invention
The invention aims to provide a composite steel ladle free of a calcium treatment process, which can effectively block the mutual reaction of Al in molten steel and MgO in an aluminum-magnesia carbon brick, improve the cleanliness of the molten steel, ensure the castability of the molten steel and solve the problems in the background technology.
The technical scheme of the invention is as follows:
the composite steel ladle comprises a steel cladding, a heat preservation layer, a permanent layer, a wall cladding working layer and a bottom cladding working layer, wherein the wall cladding working layer is formed by laying aluminum-magnesium-carbon bricks and wall cladding magnesia-free bricks, the aluminum-magnesium-carbon bricks are positioned between the permanent layer and the wall cladding magnesia-free bricks, the bottom cladding working layer is formed by laying bottom magnesia-free bricks, and the chemical components of the wall cladding magnesia-free bricks and the bottom magnesia-free bricks are as follows in percentage by mass: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the apparent porosity is less than or equal to 10 percent, and the compressive strength is more than or equal to 80MPa.
The thickness of the wall-covering magnesia-free brick is 40% -90% of the total thickness of the whole wall-covering working layer.
When the magnesite bricks are not covered on the wall of the wall-covering working layer and the magnesite bricks are not covered on the bottom of the bottom-covering working layer, the bricking is carried out by using the refractory clay, and the chemical components of the refractory clay are as follows in mass percent: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the volume density is more than or equal to 2.50g/cm 3 The compressive strength is more than or equal to 50MPa, and the flexural strength is more than or equal to 10MPa.
The mechanism of the invention is as follows: endogenous inclusion in steelMainly comprises magnesia-alumina spinel inclusions with high melting point, which are easy to gather and agglomerate at the water gap in the casting process, thereby leading to blockage of the stopper rod and the water gap and quality degradation of the inclusions exceeding standards. Analysis of inclusions resulting in long rods revealed that these inclusions were mainly MgO-Al 2 O 3 Nonmetallic inclusions (magnesia-alumina spinel) mainly composed of [ Al ] in molten steel]Al and Al 2 O 3 The inclusions react with MgO in the alumina magnesia carbon bricks to generate the alumina magnesia carbon bricks. The reaction formula is as follows:
2[Al]+3 (MgO) lining or slag=3 [ mg]＋Al 2 O 3 ；
[Mg]＋2[Al]+4[O]=(MgO.Al 2 O 3 ) Inclusion;
[Mg]＋n/3(Al 2 O 3 ) Inclusion = (MgO (n-1)/3 Al 2 O 3 ) Inclusions +2/3[ Al ]]）
By adopting the invention, in the casting process, the magnesia-free bricks on the coating wall and the magnesia-free bricks on the coating bottom are contacted with the molten steel, so that the reaction is effectively blocked, the generation of magnesia-alumina spinel inclusions is greatly reduced, and the castability of the molten steel is ensured.
The beneficial effects of the invention are as follows: the magnesia-free brick has better performances of chemical erosion resistance, mechanical scouring resistance and the like; under the condition of improving the performance of the ladle wall bricks, the refractory material cost is reduced. The composite steel ladle has the advantages of low cost, high performance, high safety and the like, and has good use effect. In particular, in the casting process, the magnesia bricks without the wall and the magnesia bricks without the bottom are in direct contact with molten steel, so that the mutual reaction of Al in the molten steel and MgO in the alumina magnesia carbon bricks is effectively blocked, the generation of magnesia alumina spinel inclusions is stopped, the cleanliness of the molten steel is improved, the castability of the molten steel is ensured, and the continuous drawing furnace number is improved especially for the steel without calcium treatment.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a photograph showing a comparison of a nozzle after calcium treatment of an alumina magnesia carbon brick ladle with a nozzle after no calcium treatment of a magnesia free composite ladle;
in the figure: 1. a steel cladding; 2. a heat preservation layer; 3. a permanent layer; 4. a wrapping area; 5. a slag line zone; 6. wall-covered aluminum magnesia carbon bricks; 7. the wall of the bag is covered with no magnesia bricks; 8. and a bottom-wrapping working layer.
Detailed Description
The invention is further illustrated by way of example with reference to the accompanying drawings.
Referring to fig. 1, a composite ladle of a calcium-free treatment process comprises a steel cladding 1, a heat insulation layer 2, a permanent layer 3, a cladding area 4, a slag line area 5, a cladding working layer and a cladding bottom working layer 8, wherein the cladding working layer is formed by laying cladding aluminum-magnesium-carbon bricks 6 and cladding magnesium-free bricks 7, the cladding aluminum-magnesium-carbon bricks 6 are positioned between the permanent layer 3 and the cladding magnesium-free bricks 7, and the cladding magnesium-free bricks 7 comprise the following chemical components in percentage by mass: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the apparent porosity is less than or equal to 10 percent, and the compressive strength is more than or equal to 80MPa; the bottom-covered working layer (8) is formed by laying bottom-covered magnesia-free bricks, and the bottom-covered magnesia-free bricks comprise the following chemical components in percentage by mass: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the apparent porosity is less than or equal to 10 percent, and the compressive strength is more than or equal to 80MPa.
The thickness of the wall-covering magnesite brick is 40% -90% of the total thickness of the whole wall-covering working layer.
When the non-magnesia bricks 7 of the covering wall and the non-magnesia bricks of the covering bottom in the covering wall working layer 8 are built, the fire clay is used for building, and the chemical components of the fire clay are as follows in mass percent: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the volume density is more than or equal to 2.50g/cm 3 The compressive strength is more than or equal to 50MPa, and the flexural strength is more than or equal to 10MPa.
Example 1:260t ladle:
(1) The total thickness of the wall-cladding working layer is 170mm, the thickness of the wall-cladding magnesia-free brick 7 is 100mm, and the components of the wall-cladding working layer are Al 2 O 3 98.4%, the balance impurities; the performance index is 7% of apparent porosity, and the normal temperature compressive strength is 125MPa;
(2) The bottom working layer 8 is built by using bottom magnesia-free bricks, and the composition of the bottom working layer is Al 2 O 3 94.3 percent, 3.6 percent of C and the balance of impurities, wherein the performance index is apparent porosity 8 percent and compressive strength is 85MPa;
(3) In the wall-covering working layerWhen the non-magnesia bricks 7 of the covering wall and the non-magnesia bricks of the covering bottom in the working layer 8 of the covering bottom are built, the refractory clay is built, and the chemical components in percentage by mass are as follows: al (Al) 2 O 3 92.1%，SiO 2 3.2%, C3.5%; the balance of impurities, and the performance indexes are as follows: bulk Density of 2.7g/cm 3 The compressive strength is 56MPa, and the flexural strength is 12MPa.
(4) The bottom-covered air brick, the water gap brick and the slag line brick are still built by using magnesia carbon bricks.
The built magnesium-free composite steel ladle is used on line after being baked according to a baking curve, when the low-carbon steel SPHC steel grade is produced, the smelting process is not subjected to calcium treatment, the castability of molten steel is good, and 11-furnace continuous casting is realized.
Fig. 2 is a comparison of a photograph of a 10-furnace rear nozzle of an aluminum-magnesium-carbon brick ladle for continuous casting of an SPHC steel grade with a photograph of a 11-furnace rear nozzle of a magnesium-free composite ladle for continuous casting of an SPHC steel grade without calcium treatment, and by comparison, it can be found that the magnesium-free composite ladle is used, and the nozzle is not blocked even if no calcium treatment is performed.
Example 2:100t ladle:
(1) The total thickness of the wall-cladding working layer is 190mm, the thickness of the wall-cladding magnesia-free brick 7 is 90mm, and the components of the wall-cladding working layer are Al 2 O 3 90.4%, C8.5% and the balance of impurities; the performance index is 5% of apparent porosity, and the normal temperature compressive strength is 85MPa;
(2) The bottom working layer 8 is built by using bottom magnesia-free bricks, and the composition of the bottom working layer is Al 2 O 3 90.7 percent, 8.3 percent of C and the balance of impurities, wherein the performance index is apparent porosity 8 percent and compressive strength is 89MPa;
(3) When the magnesia bricks 7 and the magnesia bricks 8 are built, the refractory mortar is built, and the chemical components in mass percent are as follows: al (Al) 2 O 3 90%，SiO 2 4%, C4.5%; the balance of impurities, and the performance indexes are as follows: the volume density is more than or equal to 2.50g/cm 3 The compressive strength is more than or equal to 50MPa, and the flexural strength is more than or equal to 10MPa.
(4) The bottom-covered air brick, the water gap brick and the slag line brick are still built by using magnesia carbon bricks.
The built magnesium-free composite steel ladle is used on line after being baked according to a baking curve, when the high-carbon steel GCr15 steel grade is produced, the smelting process is not subjected to calcium treatment, the castability of molten steel is good, and 9-furnace continuous casting is realized.
Claims (3)
1. The utility model provides a composite steel ladle of no calcium treatment technology, includes ladle shell (1), heat preservation (2), permanent layer (3), package wall working layer and package bottom working layer (8), its characterized in that: the wall-wrapping working layer is formed by building aluminum magnesia carbon bricks (6) and wall-wrapping magnesia carbon bricks (7), wherein the aluminum magnesia carbon bricks (6) are positioned between the permanent layer (3) and the wall-wrapping magnesia carbon bricks (7), and the wall-wrapping magnesia carbon bricks (7) comprise the following chemical components in percentage by mass: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the apparent porosity is less than or equal to 10 percent, and the compressive strength is more than or equal to 80MPa; the bottom-covered working layer (8) is formed by laying bottom-covered magnesia-free bricks, and the bottom-covered magnesia-free bricks comprise the following chemical components in percentage by mass: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the apparent porosity is less than or equal to 10 percent, and the compressive strength is more than or equal to 80MPa.
2. The composite ladle of the calcium-free treatment process according to claim 1, wherein: the thickness of the wall-covering magnesite-free brick (7) is 40% -90% of the total thickness of the wall-covering working layer.
3. The composite ladle of the calcium-free treatment process according to claim 1, wherein: when the non-magnesia bricks (7) of the wall and the non-magnesia bricks of the bottom of the wall in the working layer (8) are built, the refractory clay is used for building, and the mass percentages of the chemical components of the refractory clay are as follows: al (Al) 2 O 3 ≥90%，SiO 2 Less than or equal to 5 percent, C less than or equal to 5 percent; the performance indexes are as follows: the volume density is more than or equal to 2.50g/cm 3 The compressive strength is more than or equal to 50MPa, and the flexural strength is more than or equal to 10MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210355690.7A CN114749646B (en) | 2022-04-06 | 2022-04-06 | Composite steel ladle free of calcium treatment process |
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| CN202210355690.7A CN114749646B (en) | 2022-04-06 | 2022-04-06 | Composite steel ladle free of calcium treatment process |
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| CN114749646B true CN114749646B (en) | 2023-06-02 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61269968A (en) * | 1985-05-24 | 1986-11-29 | Nippon Steel Corp | Lining structure for ladle |
| CN104972103A (en) * | 2015-07-15 | 2015-10-14 | 武汉钢铁(集团)公司 | Combined type steel ladle permanent layer casting body |
| CN108330389A (en) * | 2018-01-31 | 2018-07-27 | 日照钢铁控股集团有限公司 | One kind exempting from Calcium treatment calmness clean steel production technology |
| CN113845353A (en) * | 2020-06-28 | 2021-12-28 | 宝山钢铁股份有限公司 | Transition brick layer for ladle wall of ladle working lining |
| CN113930583A (en) * | 2021-09-17 | 2022-01-14 | 北京科技大学 | Method for improving pouring stability of calcium-treatment-free low-carbon aluminum killed steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015043452A1 (en) * | 2013-09-29 | 2015-04-02 | 武汉钢铁(集团)公司 | Method for improving use efficiency of smelting ladle, and smelting ladle of long service life and low material consumption |
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- 2022-04-06 CN CN202210355690.7A patent/CN114749646B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61269968A (en) * | 1985-05-24 | 1986-11-29 | Nippon Steel Corp | Lining structure for ladle |
| CN104972103A (en) * | 2015-07-15 | 2015-10-14 | 武汉钢铁(集团)公司 | Combined type steel ladle permanent layer casting body |
| CN108330389A (en) * | 2018-01-31 | 2018-07-27 | 日照钢铁控股集团有限公司 | One kind exempting from Calcium treatment calmness clean steel production technology |
| CN113845353A (en) * | 2020-06-28 | 2021-12-28 | 宝山钢铁股份有限公司 | Transition brick layer for ladle wall of ladle working lining |
| CN113930583A (en) * | 2021-09-17 | 2022-01-14 | 北京科技大学 | Method for improving pouring stability of calcium-treatment-free low-carbon aluminum killed steel |
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