CN111113634A - Combined plate blank continuous casting tundish turbulence controller and preparation method thereof - Google Patents
Combined plate blank continuous casting tundish turbulence controller and preparation method thereof Download PDFInfo
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/087—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/54—Producing shaped prefabricated articles from the material specially adapted for producing articles from molten material, e.g. slag refractory ceramic materials
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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
-
- 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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- 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
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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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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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
- C04B2235/425—Graphite
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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
- C04B2235/428—Silicon
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a combined plate blank continuous casting tundish turbulence controller and a preparation method thereof, wherein the combined plate blank continuous casting tundish turbulence controller comprises a shell and a sleeve core, the sleeve core is arranged in an inner cavity of the shell, the sleeve core comprises an upper sleeve core part and a lower sleeve core part which are arranged up and down, the lower sleeve core part is arranged on the bottom surface of the inner cavity of the shell, the longitudinal central line of the upper sleeve core part and the lower sleeve core part is superposed with the longitudinal central line of the inner cavity of the shell, a joint seam is arranged between the side walls of the shell and the sleeve core, the upper part of the width of the joint seam is large, the lower part of the width of the joint seam is small, a bulge structure deviating from the longitudinal central line of the inner cavity of the sleeve core and the pouring. The combined structure design of the body shell, the upper part of the sleeve core and the lower part of the sleeve core is adopted, the upper part of the sleeve core and the lower part of the sleeve core are integrally designed, made of different materials and manufactured in a split mode, and meanwhile performance requirements of metallurgy functionalization, long service life and low cost are met.
Description
Technical Field
The invention relates to the technical field of continuous casting refractory material processes, in particular to a combined plate blank continuous casting tundish turbulence controller and a preparation method thereof.
Background
The turbulence controller is arranged in the tundish of the continuous casting machine, so that the running route of molten steel in the tundish can be changed, the retention time is prolonged, floating removal of impurities is promoted, the important effect on improving the quality of a casting blank is achieved, meanwhile, the scouring of a ladle pouring stream on a tundish working lining impact area can be slowed down, and the continuous casting time of the tundish is prolonged. In recent years, the production technology of the turbulence controller is developed to the metallurgy functionalization, the longevity and the cost reduction, but the tundish turbulence controller produced by the prior art cannot meet the performance requirements of the metallurgy functionalization, the longevity and the cost reduction at the same time.
Patent document No. CN103658577B discloses a method for manufacturing a continuous casting tundish composite turbulence controller, the composite turbulence controller includes a housing, a bottom plate, a sleeve core, expansion joints, and an antioxidant coating, the housing is cast by magnesium castable, the bottom plate is built by magnesium carbon bricks formed by mechanical pressing, the sleeve core is built by "fan-shaped" magnesium carbon bricks formed by mechanical pressing, the expansion joints are arranged between the housing and the bottom plate, and between the housing and the sleeve core, and the antioxidant coating is coated on the outer surface of the sleeve core. The invention has the following defects: the inner cavity is cylindrical, the effect of inhibiting turbulent kinetic energy of ladle injection turbulence is poor, the flow characteristic of molten steel in the tundish is not favorably improved, and meanwhile, the sleeve core is built by fan-shaped magnesia carbon bricks, so that the integral performance is poor, bricks are easy to fall off, the quality stability is deficient, and the production cost is higher.
Disclosure of Invention
Aiming at the problems, the invention provides a combined plate blank continuous casting tundish turbulence controller and a preparation method thereof, the combined structure design of a body shell, the upper part of a sleeve core and the lower part of the sleeve core is adopted, the upper part of the sleeve core and the lower part of the sleeve core are integrally designed, are made of different materials and are separately prepared, the shape design of the inner cavity of the combined sleeve core is based on the numerical simulation research and application test of the plate blank continuous casting tundish, and simultaneously, the performance requirements of metallurgy functionalization, long service life and low cost are met.
The technical scheme for solving the technical problem of the invention is as follows:
the utility model provides a package turbulence controller in middle of modular slab continuous casting, includes shell and cover core, the cover core set up in the inner chamber of shell, the cover core including upper and lower cover core upper portion, the cover core lower part that sets up, cover core lower part set up on the bottom surface of shell inner chamber, and the coincidence of the vertical central line of cover core upper portion and cover core lower part and the vertical central line of shell inner chamber is equipped with the joint line between the lateral wall of shell and cover core, the width upper portion of joint line big, the lower part is little, can increase the density of joint line lower part stopping naturally, has effectively prevented the steel problem that oozes that joint line top-down link up. The bottom of the inner cavity at the lower part of the sleeve core is provided with a convex structure deviating from the longitudinal central line of the inner cavity of the sleeve core and the pouring center of the ladle, and the convex structure is in a circular truncated cone shape. The invention reduces the injection caused by the impact of the steel flow on the convex structure and the scouring of the inner cavity wall of the turbulence controller by arranging the convex structure deviating from the longitudinal central line of the inner cavity of the sleeve core and the pouring center of the ladle, and improves the effect of inhibiting the turbulent kinetic energy of the steel flow by arranging the convex structure on the longitudinal central line of the inner cavity of the sleeve core in a relative ratio through the eccentric design.
Furthermore, the inner cavity at the upper part of the sleeve core is in a circular truncated cone shape with a small inner diameter at the upper part and a large inner cavity at the lower part, the height a of the upper part of the sleeve core is 290-320 mm, the inner diameter d1 of the upper bottom surface is 440-460 mm, the inner diameter d2 of the lower bottom surface is 520mm, the bottom surface of the inner cavity at the lower part of the sleeve core is an arc curved surface, the side wall and the bottom surface of the inner cavity at the lower part of the sleeve core are in transition through an arc chamfer, the radius R of the arc chamfer is 75-85mm, the height b of the lower part of the sleeve core is 180mm, the diameter d1 of the bottom surface circle of the inner cavity at the lower part of the sleeve core is 518. The upper part of the sleeve core is designed into a structure with a small upper opening and a large lower inner diameter, so that the splashing problem of molten steel is solved.
Further, the shape of the upper part of the sleeve core is a circular truncated cone with a large upper bottom and a small lower bottom, the circular outer diameter D1 of the upper bottom is 710-730 mm, the circular outer diameter D2 of the lower bottom is 650-680 mm, the shape of the lower part of the sleeve core is a circular truncated cone with a large upper bottom and a small lower bottom, the circular outer diameter D2 of the upper bottom of the lower part of the sleeve core is 650-680 mm, the circular outer diameter D3 of the lower bottom of the lower part of the sleeve core is 620-640 mm, the inner diameter of the upper bottom of the lower part of the sleeve core is the same as the inner diameter of the lower bottom of the upper part of the sleeve core, and the. According to the design, the side wall of the sleeve core is of a structure with a thick upper end and a thin lower end, and the upper part is heavier than the lower part when the steel flow scours in the construction process, so that the technical problem that the erosion rate of the upper part is higher than that of the lower part is solved, and the service life of the turbulence controller is prolonged.
Further, protruding structure's shape for the conical shape intercepting 20mm high top and the round platform shape that forms, conical bottom surface circle diameter d be 190 ~ 210mm, height h is 190 ~ 210mm, set up protruding structure for the center deviating from the point that cover core lower part inner chamber bottom plane circle center distance x is 97 ~ 98mm, protruding structure and bale pouring flow central line's distance y is 15 ~ 25mm, cover core lower part inner chamber bottom plane passes through circular arc chamfer transition with the lateral wall of protruding structure, the radius r of this circular arc chamfer is 45 ~ 55 mm.
Furthermore, the width m of the upper part of the bonding seam is 10-15 mm, and the width n of the lower part of the bonding seam is 5-10 mm.
A preparation method of a combined plate blank continuous casting tundish turbulence controller comprises the following steps: sequentially sleeving the lower part and the upper part of the sleeve core in a shell of a turbulence controller from bottom to top, ensuring that the longitudinal center line of the lower part and the upper part of the sleeve core is superposed with the longitudinal center line of an inner cavity of the shell, filling a joint seam between the shell and the lower part and the upper part of the sleeve core by using sintered magnesia with the granularity of less than or equal to 1mm, smearing a layer of regenerated magnesia carbon coating material with the thickness of 25-35 mm on the outer surface of the sintered magnesia, and preventing the sintered magnesia in the joint seam from falling and causing the quality problems of sleeve core looseness and the like by the coating material; naturally curing for 1-2 days, and completing the preparation of the combined plate blank continuous casting tundish turbulence controller;
the shell is formed by casting magnesium spinel castable, natural curing and baking in a heating furnace, the shape and the size of the shell are designed according to the shape and the size of an impact area of a work lining of a continuous casting tundish of a beam blank, the magnesium spinel castable is produced by the prior art, the MgO content is more than or equal to 71 wt%, and the volume density is more than or equal to 3.03g/cm3The breaking strength (1500 ℃) is more than or equal to 9 Mpa;
the upper part of the sleeve core is molded by casting a regenerated magnesia carbon castable, and the regenerated magnesia carbon castable comprises the following raw materials: particle size of 3mm ≦ particle size<20-25% of waste magnesia carbon brick regenerated particle material with the particle size of 1mm ≦<22-25% of waste magnesia carbon brick regenerated particle material with the particle size of 3mm, and the particle size of 0.074mm is less than or equal to<15-20% of 1mm waste magnesia carbon brick regenerated particle material, and the particle size of 3mm is less than or equal to<0-5% of sintered magnesia with the particle size of 1mm ≦ and the particle size of 5mm<0-5% of 3mm sintered magnesia, and less than or equal to 0.074mm in particle size<0-7% of sintered magnesia with the particle size of 1mm, 10-13% of sintered magnesia with the particle size less than or equal to 0.074mm, 3.0-5.0% of light-burned magnesia powder with the particle size less than or equal to 0.045mm, 2-4% of silicon powder with the particle size of 200 meshes, 1.0-1.5% of silicon micropowder and α -AI (active ingredient)2O33.0-5.0% of micro powder, 3.2-3.8% of pure calcium aluminate cement, 0.15-0.2% of sodium tripolyphosphate and 0.05-0.1% of explosion-proof fiber; the explosion-proof fiber is prepared by modifying polypropylene fiber, has the characteristics of good dispersibility, no sintering, no doubling, less residue, good use effect and the like, is a good anti-explosion additive for various unshaped refractory materials, and particularly relates to a high-strength quick-drying unshaped refractory material. The length L is 6mm, the phasor diameter D is 0.048mm, and the melting point is 165-175 ℃.
As is well known, a carbon-containing refractory material has excellent slag resistance, wherein a carbon source is scale graphite, the scale graphite has a completely developed crystalline carbon structure, the erosion resistance and the oxidation resistance are superior to amorphous carbon such as asphalt, carbon black, resin, granular graphite and the like, but the scale graphite has poor wettability and dispersibility on water, and the development of a carbon-containing castable material by taking the scale graphite as the carbon source is a well-known technical difficulty in the technical fieldThe difference between the present invention and the prior art is characterized in that the waste magnesia carbon brick regenerated particle material is used as a carbon source, a proper amount of silicon micropowder and sodium tripolyphosphate are simultaneously introduced as a water reducing agent and a dispersing agent, and light-burned magnesia powder and α -AI are introduced2O3The micro powder reacts to generate magnesium aluminate spinel, volume expansion is generated, and slag penetration resistance of the regenerated magnesia-carbon dry material is further improved. The amount of the waste magnesia carbon brick regenerated particles in the regenerated magnesia carbon castable material composition reaches 60-70% instead of magnesia sand, so that the production cost of the regenerated magnesia carbon castable is greatly reduced, and the production cost of the slab continuous casting tundish turbulence controller with low cost and long service life is further greatly reduced.
The lower part of the sleeve core is prepared by an isostatic pressing forming method, and the lower part of the sleeve core comprises the following raw materials:
main materials: 76-84 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm,
auxiliary materials: 11.5 to 16 wt% of flake graphite,
antioxidant: 2-5 wt% of one or more of aluminum powder, silicon powder and silicon carbide powder with the granularity of 100 meshes,
binding agent: 3.5-4.0 wt% of phenolic resin.
Further, the preparation method of the upper part of the sleeve core comprises the following steps:
1) adding the raw materials of the regenerated magnesia-carbon castable into a mixer for dry mixing for 2-3 minutes;
2) adding water accounting for 6.7-7.2% of the total weight of the materials, and wet mixing for 4-6 minutes:
3) after mixing uniformly, placing the mixture into a casting tire film on the upper part of the sleeve core, compacting the mixture by using a vibrating rod, and finishing green body casting on the upper part of the sleeve core when no large bubbles emerge;
4) after solidification is carried out for 12-24 hours, a casting tire membrane on the upper part of the sleeve core is removed, and natural curing is carried out for 12-24 hours;
5) and (3) baking in a heating furnace, wherein ① is heated to 120-150 ℃ from room temperature at a heating rate of 10 ℃/h, ② is insulated for 8-12 h at 120-150 ℃, ③ is heated to 200-220 ℃ from the heating rate of 10 ℃/h, ④ is insulated for 16-24 h at 200-220 ℃, ⑤ is shut down, and the sleeve core is naturally cooled to room temperature, so that the preparation of the sleeve core is completed.
Further, the preparation method of the lower part of the sleeve core comprises the following steps:
1) preparing materials: weighing the raw materials at the lower part of the sleeve core according to the proportion;
2) mixing: preheating a mixing roll to 40-50 ℃, adding sintered magnesia with the particle size less than or equal to 1mm and less than or equal to 3mm and the particle size less than 1mm and less than 0.074mm at low speed, dry-mixing for 1-2 minutes, adding phenolic resin, wet-mixing for 2-3 minutes, adding crystalline flake graphite, wet-mixing for 2-3 minutes, adding sintered magnesia with the particle size less than or equal to 0.074mm and an antioxidant, wet-mixing for 2-3 minutes, high-speed mixing for 10-15 minutes, discharging, wherein the temperature of a pug in the mixing process is less than 70 ℃;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under the pressure of 200-250 MPa by equal static pressure, and then discharging the mold, thus completing green body molding;
4) and (3) naturally drying and baking, namely naturally drying the formed green body for 8-16 hours, then putting the green body into a kiln for baking, wherein ① is heated to 140-160 ℃ from room temperature at a heating rate of 10 ℃/h, preserving heat for 4-8 hours, ② is heated to 200-220 ℃ from the heating rate of 10 ℃/h, preserving heat for 16-24 hours, ③ is stopped, the green body is taken out of the kiln after being naturally cooled to room temperature, and the preparation of the lower part of the core sleeve is completed.
Further, the regenerated magnesia carbon coating is processed by waste magnesia carbon bricks, and the particle size of the coating is less than or equal to 1mm and less than or equal to 3mm, and the particle size of the coating is less than or equal to 0.074mm<The coating is prepared from 1mm of regenerated magnesia carbon granules, and sintered magnesia fine powder with the granularity of less than or equal to 0.074mm, soft clay, silica micropowder and sodium tripolyphosphate, wherein the regenerated magnesia carbon granules are 60-70 wt%, the MgO content is more than or equal to 65 wt%, and the bulk density is more than or equal to 1.87g/cm3。
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
1. the invention relates to a combined plateThe upper part and the lower part of a sleeve core of the turbulence controller of the billet continuous casting tundish are integrally designed and formed in a split mode, an inner cavity of the upper part of the sleeve core is in a circular truncated cone shape with a small upper bottom surface and a large lower bottom surface, the diameter d1 of an upper bottom surface circle of an outer circular truncated cone is 440-460 mm, and the diameter d2 of a lower bottom surface circle of the outer circular truncated cone is 500-520 mm; the bottom of the inner cavity at the lower part of the sleeve core is an arc curved surface, the diameter d1 of the bottom circle of the inner cavity is 518-538mm, a convex structure is arranged by taking a point which is deviated from the center of the bottom plane circle by a distance x of 97-98 mm as the center, and the distance y between the convex structure and the pouring center line of the ladle pouring flow is 15-25 mm; the convex structure is in a truncated cone shape and is formed in a cone shape with the top of 20mm in intercepting height, the diameter d of the bottom circle of the cone shape is 190-210 mm, the height h is 190-210 mm and the like, and the design is obtained by taking a slab continuous casting tundish as a research object through numerical simulation research and application test verification by technical personnel in the field, the design has direct influence on the flowing state of molten steel in the middle of a slab, the bottom of the inner cavity of the sleeve core of the slab continuous casting tundish turbulence controller designed by the invention is an arc curved surface, the truncated cone-shaped convex structure deviating from the center of the inner cavity of the turbulence controller and the side wall of the inner cavity of the truncated cone-shaped curved surface structure are arranged, so that a ladle stream is sputtered in different directions in the inner cavity of the sleeve core of the turbulence controller and collides with each other to dissipate most kinetic energy, the degree of the molten steel forming turbulence is weakened, and slag entrapment caused by strong turbulence, the numerical simulation calculation results show that the central section steel flow turbulence kinetic energy of the tundish of the continuous casting tundish composite turbulence controller with the straight cylindrical inner cavity is 1.52m respectively2s2，1.92m2s2The oxygen content in the molten steel in the crystallizer is reduced by more than 11 percent in the same ratio, and the problem of slag entrapment caused by injection flow in an impact zone is effectively solved.
2. The upper part of the sleeve core adopts the regenerated magnesia carbon castable which takes the waste magnesia carbon brick regenerated particle as the main raw material, the amount of the waste magnesia carbon brick regenerated particle substituting for magnesia reaches 60-70%, and the preparation method of casting molding by adopting the regenerated magnesia carbon castable has the beneficial effects that: the forming quality is high, the overall performance is good, the production cost is low, the problems that the CN103658577B composite flow stabilizer sleeve core of the continuous casting tundish is built by adopting fan-shaped magnesia carbon bricks, the overall performance is poor, the production cost is high, the service life is asynchronous with the service life of a tundish working lining are effectively solved, the service life is prolonged to 35-38 hours from 31-35 hours at the same time, and the production cost is reduced by more than 32 percent at the same time.
3. The lower part of the sleeve core of the combined slab continuous casting tundish turbulence controller is prepared by an isostatic pressing method by using sintered magnesia as a main raw material, the isostatic pressing method uniformly pressurizes a sample from all directions by utilizing the incompressible property and the uniform pressure transmission property of a liquid medium, and the pressure applied to powder in all directions is uniform and consistent, so that the powder is more compactly and uniformly molded, the molding quality and the overall performance of the arc curved surface of the inner cavity bottom of the lower part of the sleeve core and the circular truncated cone-shaped convex structure are improved, and the requirements of metallurgy functionalization and long service life are met.
Drawings
FIG. 1 is a front view of the combined slab continuous casting tundish turbulence controller of the present invention;
FIG. 2 is a top view of a core structure of the combined slab continuous casting tundish of the present invention;
in the figure, 1, a housing; 2. the upper part of the sleeve core; 3. the lower part of the sleeve core, 4, a joint seam; 5. and (4) a convex structure.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
The following examples are intended to further illustrate the invention, but the invention is not limited thereto. The magnesium spinel castable and the waste magnesia carbon brick regeneration granule used in the embodiment are produced by adopting the prior art. Other raw materials are all commercial products:
the sintered magnesia is produced by using light-burned magnesia with the MgO content of 95 wt% as a raw material through the processes of ball pressing, high-temperature shaft kiln calcination and the like, and the MgO content is 94-95 wt%.
The light-burned magnesia powder has MgO content not less than 92 wt% and granularity 325 mesh.
The silicon micropowder is a byproduct of the production of metallic silicon or ferrosilicon; the content of SiO2 in the silica fume is more than or equal to 92 wt%, the particle size is less than 5 mu m, and the particle size less than 2 mu m accounts for 80-85%.
The α -AI2O3Micro powder, AI2O3The content is more than or equal to 99.5wt percent, and the granularity is 325 meshes.
The silicon powder has the purity Si content of more than or equal to 97wt percent and the granularity of 100 meshes and 200 meshes.
The calcium aluminate cement is CA-70. The concrete indexes of the pure calcium aluminate cement with the CA-70 mark are as follows: AI2O368.5-71.5％；CaO 26.5-30.5％；SiO2≤0.5％；Fe2O3Less than or equal to 0.5 percent; specific surface area (cm)2/g) is more than or equal to 5000; the initial setting time (min) is more than or equal to 150; the final setting (h) is less than or equal to 6; the 24-hour curing strength (MPa) flexural strength (MPa) is more than or equal to 5, the compressive strength (MPa) is more than or equal to 40, and the refractoriness (DEG C) is 1680. The detection standard is GB 201-2000.
The explosion-proof fiber is prepared by modifying polypropylene fiber, has the characteristics of good dispersibility, no sintering, no doubling, less residue, good use effect and the like, is a good anti-explosion additive for various unshaped refractory materials, and particularly relates to a high-strength quick-drying unshaped refractory material. The length L is 6mm, the phasor diameter D is 0.048mm, and the melting point is 165-175 ℃.
The purity C content of the flake graphite is more than or equal to 98 wt%, and the granularity is 100 meshes.
The Al powder has a purity AI content of more than or equal to 99 wt% and a particle size of 100 meshes.
The SiC content of the silicon carbide powder is more than or equal to 94 wt%, and the granularity is 100 meshes.
The solid content of the phenolic resin is more than or equal to 72 wt%, the residual carbon content is more than or equal to 42 wt%, and the water content is less than or equal to 5 wt%.
Example 1:
as shown in figures 1 and 2, a combined plate blank continuous casting tundish turbulence controller is formed by combining a shell 1, a sleeve core upper part 2 and a sleeve core lower part 3, the sleeve core upper part 2 and the sleeve core lower part 3 are integrally designed and formed in a split mode, the sleeve core lower part 3 is positioned on the bottom of an inner cavity of the shell 1, the bottom of the inner core 2 of the sleeve core upper part 2 is positioned on the sleeve core lower part 3, the longitudinal central lines of the sleeve core upper part 2 and the sleeve core lower part 3 are superposed with the longitudinal central line of the inner cavity of the shell 1, a joint seam 4 is arranged between the shell 1 and the sleeve core upper part 2 as well as the sleeve core lower part 3, the shape design of the inner cavity formed by combining the sleeve core upper part 2 and the sleeve core lower part 3 is based on the numerical simulation research and application test of the plate blank tundish, a bulge structure 5 deviating from the center of the turbulence controller and the pouring center of a bale is arranged at the bottom of the inner cavity of the sleeve core, the lower part 3 of the sleeve core adopts a magnesium-carbon prefabricated part prepared by an isostatic pressing forming method.
The turbulence controller is characterized in that the shape of the upper part 2 of the sleeve core of the turbulence controller is a circular truncated cone with a large upper bottom surface and a small lower bottom surface, the height a of the outer circular truncated cone is 300mm, the diameter D1 of the upper bottom surface of the outer circular truncated cone is 720mm, the diameter D2 of the lower bottom surface of the outer circular truncated cone is 665mm, the inner cavity of the upper part 2 of the sleeve core is a circular truncated cone with a small upper bottom surface and a large lower bottom surface, the diameter D1 of the upper bottom surface of the inner circular truncated cone is 450mm, and the diameter D2 of the lower bottom surface of the inner.
The appearance of turbulence controller's cover core lower part 3 is that the bottom surface is big, the round platform shape that the bottom surface is little in the lower bottom surface, its round platform height b is 190mm, the last bottom surface circle diameter D2 of outer round platform is 665mm, the lower bottom surface circle diameter D3 of outer round platform is 630mm, the inner chamber bottom of cover core lower part 3 is circular arc curved surface, the bottom surface circle diameter D3 of its inner chamber is 528mm, the thickness c of inner chamber bottom plane is 100mm, set up a bulge 5 at the point that deviates from bottom plane circle center at a distance x and be 97.5mm as the center, bulge 5 and the distance y of big package notes stream pouring central line are 20 mm. The protruding structure 5 is in a round table shape and is formed in a conical shape with the intercepting height of 20mm, the diameter d of a conical bottom circle is 200mm, and the height h is 200 mm. The radius R of the curved arc of the side wall of the inner cavity of the lower part 3 of the connecting sleeve core and the bottom circle of the inner cavity is 80mm, and the radius R of the curved arc of the bottom plane of the inner cavity of the lower part 3 of the connecting sleeve core and the bottom circle of the conical bottom is 50 mm.
The width of the joint seam 4 is large at the upper part and small at the lower part, the width m of the upper part is 15mm, and the width n of the lower part is 10 mm.
The shape and the size of the shell 1 are designed according to the shape and the size of a work lining impact area of a continuous casting tundish of a special-shaped blank, and the shell is prepared by casting and molding a magnesium spinel castable produced by the prior art, naturally maintaining and baking in a heating furnace.
The upper part 2 of the sleeve core is molded by casting a regenerated magnesia carbon castable, and the regenerated magnesia carbon castable for the upper part 2 of the sleeve core is composed of the following materials in percentage by weight: particle size of 3mm ≦ particle size<25 percent of waste magnesia carbon brick regenerated particle material with the particle size of 5mm, 1mm ≦ particle size<25 percent of waste magnesia carbon brick regenerated particle material with the particle size of 3mm, and the particle size of 0.074mm is less than or equal to<20 percent of 1mm waste magnesia carbon brick regenerated particle material, and the particle size of 0.074mm is less than or equal to<5% of sintered magnesite with the particle size of 1mm, 10% of sintered magnesite with the particle size of less than or equal to 0.074mm, 3.0% of light-burned magnesia powder with the particle size of less than or equal to 0.045mm, 4% of silicon powder, 1.5% of silicon micropowder, α -AI2O33.0 percent of micro powder, 3.2 percent of pure calcium aluminate cement, 0.2 percent of sodium tripolyphosphate and 0.1 percent of explosion-proof fiber.
The preparation method of the upper part 2 of the sleeve core by casting molding of the regenerated magnesia-carbon castable comprises the following steps of adding the regenerated magnesia-carbon castable for the upper part 2 of the sleeve core into a mixer for dry mixing for 2 minutes, adding water accounting for 7.2 percent of the total weight of the materials, wet mixing for 6 minutes, uniformly mixing, putting the mixture into a casting tire film on the upper part of the sleeve core, compacting by using a vibrating rod, completing casting of a green body of the upper part 2 of the sleeve core when no large bubbles emerge, removing the casting tire film on the upper part of the sleeve core after solidification for 12 hours, naturally curing for 12 hours, baking in a heating furnace, wherein ① is heated to 120 ℃ from room temperature at a heating rate of 10 ℃/h, ② is kept at 120 ℃ for 8 hours, ③ is heated to 200 ℃ from a heating rate of 10 ℃/h, ④ is kept at 200 ℃ for 24 hours, ⑤ is stopped, is naturally cooled to room temperature, and the preparation of the upper.
The lower part 3 of the sleeve core is prepared by an isostatic pressing forming method and is prepared from the following raw materials in percentage by weight:
main materials: 84 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm
Auxiliary materials: flake graphite 10.5 wt%
Antioxidant: 2.0 wt% of aluminum powder
Binding agent: 3.5 wt% of phenolic resin.
The lower part 3 of the sleeve core is prepared by an isostatic pressing forming method, which comprises the following steps:
1) preparing materials: weighing the raw materials according to the proportion;
2) mixing: preheating a mixing roll to 40 ℃, adding sintered magnesia with the granularity being less than or equal to 1mm and less than or equal to 3mm and the granularity being less than or equal to 1mm when the mixing roll is at a low speed, adding phenolic resin after dry mixing for 1 minute, adding crystalline flake graphite after wet mixing for 3 minutes, adding sintered magnesia with the granularity being less than or equal to 0.074mm and an antioxidant after wet mixing for 2 minutes, wet mixing for 3 minutes, high-speed mixing for 10 minutes, discharging, wherein the temperature of a pug in the mixing process is less than 70 ℃;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under the pressure of 200MPa by equal static pressure, and then discharging the mold, thus completing green body molding;
4) and (3) naturally drying and baking, namely naturally drying the formed green body for 8 hours, then putting the green body into a kiln for baking, heating ① from room temperature to 140 ℃ at the heating speed of 10 ℃/h, preserving heat for 8 hours, heating ② from 10 ℃/h to 200 ℃, preserving heat for 24 hours, stopping heating ③, naturally cooling to room temperature, then taking the green body out of the kiln, and completing the preparation of the lower part 3 of the sleeve core, wherein the compressive strength of the green body is more than or equal to 40 MPa.
A preparation method of a combined plate blank continuous casting tundish turbulence controller comprises the following steps: the lower part 3 and the upper part 2 of the sleeve core are sleeved in the shell 1 of the turbulence controller from bottom to top in sequence, the longitudinal center lines of the lower part 3 and the upper part 2 of the sleeve core are ensured to coincide with the longitudinal center line of the inner cavity of the shell 1, the joint seam 4 between the shell 1 and the lower part 3 and the upper part 2 of the sleeve core is filled with sintered magnesia with the granularity of less than or equal to 1mm, a layer of regenerated magnesia carbon coating material with the thickness of 35mm is coated on the outer surface of the sintered magnesia carbon coating material, the natural continuous casting is carried out for 2 days, and the preparation of the turbulence controller of the combined slab tundish is completed.
Example 2:
as described in example 1, except that:
the height a of the circular truncated cone of the upper part 2 of the sleeve core of the turbulence controller is 290mm, the diameter D1 of the upper bottom surface of the outer circular truncated cone is 710mm, the diameter D2 of the lower bottom surface of the outer circular truncated cone is 650mm, the diameter D1 of the upper bottom surface of the circular truncated cone in the inner cavity of the turbulence controller is 440mm, and the diameter D2 of the lower bottom surface of the inner circular truncated cone is 500 mm.
The height b of the circular truncated cone of the sleeve core lower part 3 of the turbulence controller is 180mm, the diameter D2 of the upper bottom surface circle of the outer circular truncated cone is 650mm, the diameter D3 of the lower bottom surface circle of the outer circular truncated cone is 620mm, the bottom of the inner cavity of the sleeve core lower part 3 is a circular arc curved surface, the diameter D3 of the bottom surface circle of the inner cavity is 518mm, the thickness c of the bottom plane of the inner cavity is 80mm, a protruding structure 5 is arranged by taking a point which deviates from the center of the bottom plane circle and has a distance x of 97mm as a center, and the distance y between the protruding structure 5 and the pouring center line of the large-package. The protruding structure 5 is in a round table shape and is formed in a conical shape with the intercepting height of 20mm, the diameter d of a bottom circle of the conical shape is 190mm, and the height h is 190 mm. The radius R of the curved arc of the side wall of the inner cavity of the lower part 3 of the connecting sleeve core and the bottom circle of the inner cavity is 75mm, and the radius R of the curved arc of the bottom plane of the inner cavity of the lower part 3 of the connecting sleeve core and the bottom circle of the conical bottom circle is 45 mm.
The upper width m of the joint seam 4 is 10mm, and the lower width n is 5 mm.
The upper part 2 of the sleeve core is cast and molded by adopting a regenerated magnesia carbon castable, and the regenerated magnesia carbon castable for the upper part 2 of the sleeve core comprises, by weight, 20% of waste magnesia carbon brick regenerated particles with the particle size of less than or equal to 3mm, 22% of waste magnesia carbon brick regenerated particles with the particle size of less than or equal to 1mm, 20% of waste magnesia carbon brick regenerated particles with the particle size of less than or equal to 0.074mm and less than or equal to 1mm, 5% of sintered magnesia with the particle size of less than or equal to 3mm, 5% of sintered magnesia with the particle size of less than or equal to 0.074mm, 13% of sintered magnesia with the particle size of less than or equal to 0.045mm, 2% of silica powder, 2.0% of silica powder, α -AI2O3 micropowder, 5.0% of pure calcium aluminate cement, 0.15% of sodium tripolyphosphate and 0.05% of explosion-proof fiber.
The preparation method of the upper part 2 of the sleeve core by casting molding of the regenerated magnesia-carbon castable comprises the following steps of adding the regenerated magnesia-carbon castable for the sleeve core 2 into a mixer for dry mixing for 3 minutes, adding water accounting for 6.7 percent of the total weight of the materials, wet mixing for 6 minutes, uniformly mixing, putting the mixture into a casting tire film on the upper part of the sleeve core, compacting by a vibrating rod, completing casting of a green body of the sleeve core 2 when no large bubbles emerge, removing the casting tire film on the upper part of the sleeve core after solidification for 24 hours, naturally curing for 24 hours, baking in a heating furnace, raising the temperature of ① from room temperature to 150 ℃ at a speed of 10 ℃/h, preserving the heat of ② at 150 ℃ for 12 hours, raising the temperature of ③ to 220 ℃ at a speed of 10 ℃/h, preserving the heat of ④ at 220 ℃ for 16 hours, stopping fire at ⑤, naturally cooling to room temperature, and completing the preparation of the upper.
The lower part 3 of the sleeve core is prepared by an isostatic pressing forming method and is prepared from the following raw materials in percentage by weight:
main materials: 76 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm
Auxiliary materials: 16 wt% of flake graphite
Antioxidant: 2 wt% of silicon powder and 2 wt% of silicon carbide powder
Binding agent: 4.0 wt% of phenolic resin.
The lower part 3 of the sleeve core is prepared by an isostatic pressing forming method, which comprises the following steps:
1) preparing materials: weighing the raw materials according to the proportion;
2) mixing: preheating a mixing roll to 50 ℃, adding sintered magnesia with the granularity being less than or equal to 1mm and less than or equal to 3mm and the granularity being less than or equal to 1mm when the mixing roll is at a low speed, adding phenolic resin after dry mixing for 2 minutes, adding crystalline flake graphite after wet mixing for 2 minutes, adding sintered magnesia with the granularity being less than or equal to 0.074mm and an antioxidant after wet mixing for 3 minutes, wet mixing for 2 minutes, mixing at a high speed for 15 minutes, discharging, wherein the temperature of a pug in the mixing process is less than 70 ℃;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under 250MPa by isostatic pressure, and then discharging the mold, thus completing green body molding;
4) and (3) naturally drying and baking, namely naturally drying the formed green body for 16 hours, then putting the green body into a kiln for baking, ① raising the temperature from room temperature to 160 ℃ at a heating rate of 10 ℃/h, preserving the heat for 4 hours, ② raising the temperature from 10 ℃/h to 220 ℃ at a heating rate of 16 hours, ③ stopping heating, naturally cooling the green body to room temperature, taking the green body out of the kiln, and finishing the preparation of the lower part 3 of the sleeve core, wherein the compressive strength of the green body is more than or equal to 40 MPa.
A preparation method of a combined plate blank continuous casting tundish turbulence controller comprises the following steps: the lower part 3 and the upper part 2 of the sleeve core are sleeved in the shell 1 of the turbulence controller from bottom to top in sequence, the longitudinal center lines of the lower part 3 and the upper part 2 of the sleeve core are ensured to be coincident with the longitudinal center line of the inner cavity of the shell 1, the joint seam 4 between the shell 1 and the lower part 3 and the upper part 2 of the sleeve core is filled with sintered magnesia with the granularity of less than or equal to 1mm, a layer of regenerated magnesia carbon coating material with the thickness of 25mm is coated on the outer surface of the sintered magnesia carbon coating material, the natural maintenance is carried out for 1 day, and the preparation of the combined slab tundish turbulence controller is completed.
Example 3:
as described in example 1, except that:
the height a of the circular truncated cone of the upper part 2 of the sleeve core of the turbulence controller is 310mm, the diameter D1 of the upper bottom surface of the outer circular truncated cone is 730mm, the diameter D2 of the lower bottom surface of the outer circular truncated cone is 680mm, the diameter D1 of the upper bottom surface of the circular truncated cone in the inner cavity of the turbulence controller is 460mm, and the diameter D2 of the lower bottom surface of the inner circular truncated cone is 520 mm.
The round platform height b of turbulence controller's cover core lower part 3 is 200mm, the last bottom surface circle diameter D2 of outer round platform is 680mm, the lower bottom surface circle diameter D3 of outer round platform is 640mm, the inner chamber bottom of cover core lower part 3 is circular arc curved surface, the diameter D3 of its inner chamber bottom surface circle is 538mm, the thickness c of inner chamber basal plane is 90mm, set up a protruding structure 5 for the center deviating from basal plane circle center point that distance x is 98mm, protruding structure 5 and the distance y of big package notes flow pouring central line are 25 mm. The protruding structure 5 is in a round table shape and is formed in a conical shape with the intercepting height of 20mm, the diameter d of a conical bottom circle is 210mm, and the height h is 210 mm. The radius R of the curved arc connecting the side wall of the inner cavity of the lower part 3 of the sleeve core with the bottom circle of the inner cavity is 85mm, and the radius R of the curved arc connecting the bottom plane circle of the inner cavity of the lower part 3 of the sleeve core with the conical bottom circle is 55 mm.
The upper width m of the joint seam 4 is 10mm, and the lower width n is 5 mm.
The upper part 2 of the sleeve core is cast and molded by adopting a regenerated magnesia carbon castable, and the regenerated magnesia carbon castable used for the upper part 2 of the sleeve core comprises, by weight, 22% of waste magnesia carbon brick regenerated particles with the particle size of less than or equal to 3mm, 23% of waste magnesia carbon brick regenerated particles with the particle size of less than or equal to 1mm, 15% of waste magnesia carbon brick regenerated particles with the particle size of less than or equal to 0.074mm and less than or equal to 1mm, 5% of sintered magnesia with the particle size of less than or equal to 3mm, 7% of sintered magnesia with the particle size of less than or equal to 0.074mm, 12% of sintered magnesia with the particle size of less than or equal to 0.045mm, 3% of silica powder, 1.25% of silica powder, 4.0% of α -AI2O3 micropowder, 3.5% of pure calcium aluminate cement, 0.17% of trimeric sodium phosphate and 0.08% of explosion-proof fiber.
The preparation method of the upper part 2 of the sleeve core by casting molding of the regenerated magnesia-carbon castable comprises the following steps of adding the regenerated magnesia-carbon castable for the sleeve core 2 into a mixer for dry mixing for 2 minutes, adding water accounting for 7.0 percent of the total weight of the materials, wet mixing for 5 minutes, uniformly mixing, putting the mixture into a casting tire film on the upper part of the sleeve core, compacting by a vibrating rod, completing casting of a green body of the upper part 2 of the sleeve core when no large bubbles emerge, removing the casting tire film on the upper part of the sleeve core after solidification for 16 hours, naturally curing for 16 hours, baking in a heating furnace, heating ① from room temperature to 135 ℃ at a heating speed of 10 ℃/h, preserving heat for 10 hours at 135 ℃ at ② ℃, heating ③ from room temperature to 210 ℃, preserving heat for 20 hours at ④ ℃, stopping fire at ⑤, naturally cooling to room temperature, and completing the preparation of the upper part 2 of the sleeve core.
The lower part 3 of the sleeve core is prepared by an isostatic pressing forming method and is prepared from the following raw materials in percentage by weight:
main materials: 79 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm
Auxiliary materials: flake graphite 14 wt%
Antioxidant: 3.3 wt% of aluminum-magnesium alloy powder
Binding agent: 3.7 wt% of phenolic resin.
The lower part 3 of the sleeve core is prepared by an isostatic pressing forming method, which comprises the following steps:
1) preparing materials: weighing the raw materials according to the proportion;
2) mixing: preheating a mixing roll to 45 ℃, adding sintered magnesia with the granularity being less than or equal to 1mm and less than or equal to 3mm and the granularity being less than or equal to 1mm when the mixing roll is at a low speed, adding phenolic resin after dry mixing for 1 minute, adding crystalline flake graphite after wet mixing for 3 minutes, adding sintered magnesia with the granularity being less than or equal to 0.074mm and an antioxidant after wet mixing for 3 minutes, wet mixing for 2 minutes, mixing at a high speed for 10 minutes, discharging, wherein the temperature of a pug in the mixing process is less than 70 ℃;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under 220MPa by isostatic pressure, and then discharging the mold, thus completing green body molding;
4) and (3) naturally drying and baking, namely naturally drying the formed green body for 12 hours, then putting the green body into a kiln for baking, ① raising the temperature from room temperature to 150 ℃ at a heating rate of 10 ℃/h, keeping the temperature for 6 hours, ② raising the temperature from 10 ℃/h to 210 ℃, keeping the temperature for 20 hours, ③ stopping heating, naturally cooling the green body to room temperature, then taking the green body out of the kiln, and completing the preparation of the lower part 3 of the sleeve core, wherein the compressive strength of the lower part is more than or equal to 40 MPa.
A preparation method of a combined plate blank continuous casting tundish turbulence controller comprises the following steps: the lower part 3 and the upper part 2 of the sleeve core are sleeved in the shell 1 of the turbulence controller from bottom to top in sequence, the longitudinal center lines of the lower part 3 and the upper part 2 of the sleeve core are ensured to be coincident with the longitudinal center line of the inner cavity of the shell 1, the joint seam 4 between the shell 1 and the lower part 3 and the upper part 2 of the sleeve core is filled with sintered magnesia with the granularity of less than or equal to 1mm, a layer of regenerated magnesia carbon coating material with the thickness of 30mm is coated on the outer surface of the shell, the shell is naturally maintained for 2 days, and the preparation of the combined slab tundish turbulence controller is completed.
Comparative example 1: CN201244677B discloses a method for preparing a continuous casting tundish composite turbulence controller, which comprises a shell, a bottom plate, a sleeve core, an expansion joint and an antioxidant coating, wherein the shell is cast and molded by adopting a magnesium casting material, the bottom plate is built by adopting magnesium carbon bricks which are molded by machine pressing, the sleeve core is built by adopting fan-shaped magnesium carbon bricks which are molded by machine pressing, the expansion joint is arranged between the shell and the bottom plate and between the shell and the sleeve core, and the antioxidant coating is coated on the outer surface of the sleeve core.
Examples 1 to 3 of the present invention and a reference CN201244677B disclose a method for preparing a continuous casting tundish composite turbulence controller), the service life, the slag entrapment in the tundish injection impact area, and the total oxygen content in molten steel in the crystallizer (comparative test steel type SPHC) were compared in the slab continuous casting tundish application test of ledwi group yinshan type steel limited company, as shown in the following table:
through the comparison of the data in the table 1, the service life of the combined type plate blank continuous casting tundish turbulence controller prepared by the invention is improved by more than 4 hours compared with the combined type turbulence controller produced by CN103658577B in the prior art, the total oxygen content in molten steel in a crystallizer is reduced by more than 11 percent in a same ratio, the production cost is reduced by more than 32 percent in a same ratio, and the problem of injection flow and slag entrapment in a tundish impact area is effectively solved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto, and various modifications and variations which do not require inventive efforts and which are made by those skilled in the art are within the scope of the present invention.
Claims (9)
1. The utility model provides a package turbulence controller in middle of modular slab continuous casting, includes shell (1) and cover core, the cover core set up in the inner chamber of shell, a serial communication port, cover core upper portion (2), cover core lower part (3) including upper and lower setting, cover core lower part (3) set up on the bottom surface of shell (1) inner chamber, and the longitudinal center line of cover core upper portion (2) and cover core lower part (3) and the longitudinal center line coincidence of shell (1) inner chamber, be equipped with joint seam (4) between the lateral wall of shell (1) and cover core, the width upper portion of joint seam big, the lower part is little, the inner chamber bottom of cover core lower part (3) is equipped with protruding structure (5) of skew cover core inner chamber longitudinal center line and big package pouring center, protruding structure be round platform shape.
2. The combined type turbulence controller for the continuous casting of slabs in the tundish as set forth in claim 1, wherein the inner cavity of the upper portion (2) of the sleeve core is in a truncated cone shape with a small inner diameter at the upper portion and a large inner cavity at the lower portion, the bottom surface of the inner cavity of the lower portion (3) of the sleeve core is a circular arc curved surface, and the side wall and the bottom surface of the inner cavity of the lower portion (3) of the sleeve core are transited through a circular arc chamfer.
3. A combined turbulence controller for a continuous slab casting tundish according to claim 2, wherein the upper portion (2) of the core has a circular truncated cone shape with a large upper bottom surface and a small lower bottom surface, and the lower portion (3) of the core has a circular truncated cone shape with a large upper bottom surface and a small lower bottom surface.
4. The combined type slab continuous casting tundish turbulence controller of claim 1, wherein the convex structure is in a cone shape with a truncated cone top part 20mm high, and the diameter d of the bottom circle of the cone shape is 190-210 mm, and the height h is 190-210 mm.
5. A combined plate blank continuous casting tundish turbulence controller according to claim 1, characterized in that the upper width m of the joint seam (4) is 10-15 mm, and the lower width n is 5-10 mm.
6. A method for preparing a combined plate blank continuous casting tundish turbulence controller is characterized in that a shell (1) is cast and molded by adopting magnesium spinel castable and is prepared by natural curing and baking in a heating furnace, and the method comprises the following steps: sequentially sleeving a sleeve core lower part (3) and a sleeve core upper part (2) in a shell (1) of a turbulence controller from bottom to top, ensuring that the longitudinal center lines of the sleeve core lower part (3) and the sleeve core upper part (2) are overlapped with the longitudinal center line of an inner cavity of the shell (1), filling a joint seam (4) between the shell (1) and the sleeve core lower part (3) and the sleeve core upper part (2) by using sintered magnesia with the granularity of less than or equal to 1mm, smearing a layer of regenerated magnesia carbon coating with the thickness of 25-35 mm on the outer surface of the sintered magnesia, naturally maintaining for 1-2 days, and completing the preparation of the turbulence controller packaged in the middle of the combined slab;
the upper part (2) of the sleeve core is molded by casting a regenerated magnesia carbon castable, and the regenerated magnesia carbon castable comprises the following raw materials: particle size of 3mm ≦ particle size<20-25% of waste magnesia carbon brick regenerated particle material with the particle size of 1mm ≦<22-25% of waste magnesia carbon brick regenerated particle material with the particle size of 3mm, and the particle size of 0.074mm is less than or equal to<15-20% of 1mm waste magnesia carbon brick regenerated particle material, and the particle size of 3mm is less than or equal to<0-5% of sintered magnesia with the particle size of 1mm ≦ and the particle size of 5mm<0-5% of 3mm sintered magnesia, and less than or equal to 0.074mm in particle size<0-7% of sintered magnesia with the particle size of 1mm, 10-13% of sintered magnesia with the particle size less than or equal to 0.074mm, 3.0-5.0% of light-burned magnesia powder with the particle size less than or equal to 0.045mm, 2-4% of silicon powder with the particle size of 200 meshes, 1.0-1.5% of silicon micropowder and α -AI (active ingredient)2O33.0-5.0% of micro powder, 3.2-3.8% of pure calcium aluminate cement, 0.15-0.2% of sodium tripolyphosphate and 0.05-0.1% of explosion-proof fiber;
the lower part (3) of the sleeve core is prepared by an isostatic pressing forming method, and the lower part (3) of the sleeve core comprises the following raw materials:
main materials: 76-84 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm,
auxiliary materials: 11.5 to 16 wt% of flake graphite,
antioxidant: 2-5 wt% of one or more of aluminum powder, silicon powder and silicon carbide powder with the granularity of 100 meshes,
binding agent: 3.5-4.0 wt% of phenolic resin.
7. A combined continuous slab casting tundish turbulence controller as claimed in claim 6, characterised in that the method of preparing the mantle core upper part (2) comprises the steps of:
1) adding the raw materials of the regenerated magnesia-carbon castable into a mixer for dry mixing for 2-3 minutes;
2) adding water accounting for 6.7-7.2% of the total weight of the materials, and wet mixing for 4-6 minutes:
3) after mixing uniformly, placing the mixture into a casting tire film on the upper part of the sleeve core, compacting the mixture by using a vibrating rod, and finishing green body casting on the upper part (2) of the sleeve core when no large bubbles emerge;
4) after solidification is carried out for 12-24 hours, a casting tire membrane on the upper part of the sleeve core is removed, and natural curing is carried out for 12-24 hours;
5) and (2) baking in a heating furnace, wherein ① is heated to 120-150 ℃ from room temperature at a heating rate of 10 ℃/h, ② is insulated for 8-12 h at 120-150 ℃, ③ is heated to 200-220 ℃ from the heating rate of 10 ℃/h, ④ is insulated for 16-24 h at 200-220 ℃, ⑤ is shut down, and the sleeve core (2) is naturally cooled to room temperature.
8. A combined slab continuous casting tundish turbulence controller according to claim 6, characterized in that the preparation method of the mantle core lower part (3) comprises the following steps:
1) preparing materials: weighing the raw materials at the lower part (3) of the sleeve core according to the mixture ratio;
2) mixing: preheating a mixing roll to 40-50 ℃, adding sintered magnesia with the particle size less than or equal to 1mm and less than or equal to 3mm and the particle size less than 1mm and less than 0.074mm at low speed, dry-mixing for 1-2 minutes, adding phenolic resin, wet-mixing for 2-3 minutes, adding crystalline flake graphite, wet-mixing for 2-3 minutes, adding sintered magnesia with the particle size less than or equal to 0.074mm and an antioxidant, wet-mixing for 2-3 minutes, high-speed mixing for 10-15 minutes, discharging, wherein the temperature of a pug in the mixing process is less than 70 ℃;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under the pressure of 200-250 MPa by equal static pressure, and then discharging the mold, thus completing green body molding;
4) and (3) naturally drying and baking, namely naturally drying the formed green body for 8-16 hours, then putting the green body into a kiln for baking, wherein ① is heated to 140-160 ℃ from room temperature at a heating rate of 10 ℃/h, preserving heat for 4-8 hours, ② is heated to 200-220 ℃ from the heating rate of 10 ℃/h, preserving heat for 16-24 hours, ③ is stopped, the green body is taken out of the kiln after being naturally cooled to room temperature, and the preparation of the lower part (3) of the sleeve core is completed.
9. The combined turbulence controller for a continuous slab casting tundish according to claim 6, wherein the regenerated magnesia carbon coating is processed by waste magnesia carbon bricks with a grain size of 1mm to 3mm and a grain size of 0.074mm to less than<1mm of regenerated magnesia-carbon granules and sintered magnesia with the granularity less than or equal to 0.074mmThe coating material is prepared from powder, soft clay, silicon micropowder and sodium tripolyphosphate, wherein the weight percentage of the regenerated magnesium-carbon granules is 60-70%, the MgO content is not less than 65 wt%, and the volume density is not less than 1.87g/cm3。
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