CN113333724B - Square-round steel ladle and refractory material building method thereof - Google Patents
Square-round steel ladle and refractory material building method thereof Download PDFInfo
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- CN113333724B CN113333724B CN202110569385.3A CN202110569385A CN113333724B CN 113333724 B CN113333724 B CN 113333724B CN 202110569385 A CN202110569385 A CN 202110569385A CN 113333724 B CN113333724 B CN 113333724B
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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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- 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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Abstract
The invention discloses a square-round steel ladle, which is formed by transforming a round steel ladle, the height of a steel shell, the distance between trunnions, the positioning of a gas brick hole and a water gap hole at the bottom of the steel ladle are not changed, and the cross section of a ladle wall is formed by splicing 4 groups of arc sections 1 and 4 groups of arc sections 2 by alternative lines; angle theta of arc segment 11Angle theta to the circular arc segment 22The sum is 90 degrees; on the same ladle wall cross section, the radius R1 of the circular arc section 1 is 0.5-0.8 times of the radius R of the circular ladle on the ladle wall cross section with the same height, and the radius R2 of the circular arc section 2 is 1.5-2.5 times of the radius R of the circular ladle on the ladle wall cross section with the same height. The invention also provides a masonry method of the refractory material of the square and round ladle, wherein the working layer of the molten pool and the working layer of the slag line are formed by adopting 3 types of brick masonry. The invention can meet the requirements of refining and continuous casting processes, increase the internal volume of the steel shell without large-scale technical modification, improve the production efficiency of steelmaking and reduce the production cost.
Description
Technical Field
The invention relates to the technical field of steel ladles for ferrous metallurgy, in particular to a square-round steel ladle and a refractory material building method thereof.
Background
The steel ladle is important thermal equipment of a steel plant, along with the continuous development of a steel-making technology, the smelting temperature is increased, the refining ratio is increased, the residence time of molten steel in the steel ladle is prolonged, particularly, the requirements of external refining LF and RH processes on the lining of the steel ladle are more and more strict, the structure, the lining material and the construction process of the steel ladle need to be continuously improved, and the requirements of the refining and continuous casting processes are met. At present, most common steel ladles are inverted circular truncated cones with large upper circles and small lower circles, effective volume of the steel ladles is limited by circular space, and increasing the loading amount of molten steel leads to reduction of clearance height in the steel ladles, so that the molten steel/steel slag is easy to splash out of the steel ladles in the refining process, and safety and refining effects are affected.
The steel enterprises aim to improve the production efficiency of steel making, reduce the production cost and improve the market competitiveness all the time, but under the condition that a steel mill production line, equipment and a high-temperature metallurgical furnace are solidified and cannot be technically improved on a large scale, economic, reliable and relatively simple measures are required to achieve the aim. The adoption of ladle expansion and the increase of molten steel loading capacity is an effective scheme.
The "expanded ladle" CN201310345415.8 patent describes a ladle lining refractory material that is thinned to achieve a ladle capacity of 140 tons. However, under the harsh condition of smelting conditions, the use safety of the refractory material is affected. Patents CN201190170Y, CN201210007615.8 and CN201220011228.7 respectively describe a small oval ladle structure optimization, which increases the volume of the refining ladle. According to research and analysis of documents and patent technologies, the ladle expansion technology is mostly small-sized oval ladles or round ladles for thinning refractory materials, and the square and round ladle expansion method is not disclosed and reported.
Disclosure of Invention
In order to meet the requirements of refining and continuous casting processes, large-scale technical improvement is not required (the requirements on the height of a steel shell, the distance between trunnions, the positioning sizes of air brick holes and water gap holes at the bottom of the ladle, the working thickness of a refractory material lining and the like are not changed), the internal volume of the steel shell is increased, the production efficiency of steelmaking is improved, and the production cost is reduced.
One of the purposes of the invention is to solve the problems of insufficient clear height of the steel ladle caused by refining requirements and incapability of large-scale equipment replacement, and the invention provides an improved square-round steel ladle and a refractory material building method thereof, which increase the content of the steel ladle and the loading capacity of molten steel, ensure the service life and safety and stability of the steel ladle, improve the steel-making production efficiency and reduce the production cost.
Another object of the present invention is to provide a refractory masonry method for a ladle in a square and round shape, which can manufacture a ladle in a square and round shape having a long life and safety and stability.
A square-round ladle is formed by reforming a round ladle, the height of a steel shell, the distance between trunnions, air brick holes at the bottom of the ladle and the positioning of a water gap hole are not changed, and the cross section of a ladle wall is formed by splicing 4 groups of arc sections 1 and 4 groups of arc sections 2 by alternate lines;
angle theta of arc segment 11Angle theta to the circular arc segment 22The sum is 90 degrees;
on the cross section of the same ladle wall, the radius R1 of the circular arc section 1 is 0.5-0.8 times of the radius R of the circular ladle on the cross section of the ladle wall with the same height, and the radius R2 of the circular arc section 2 is 1.5-2.5 times of the radius R of the circular ladle on the cross section of the ladle wall with the same height.
In a preferred embodiment, the angle θ of the circular arc segment 22Is 20-40 degrees.
In a preferred embodiment, the square and round steel ladle has a large upper opening and a small lower opening, the ladle wall sequentially comprises a steel shell, a heat insulation layer built by a heat insulation plate, a ladle wall permanent layer formed by pouring high-aluminum castable, a molten pool working layer formed by pouring corundum spinel precast blocks, a slag line working layer built by magnesia carbon bricks and a ladle opening built by plastic materials from outside to inside, the ladle bottom sequentially comprises a ladle bottom permanent layer formed by pouring high-aluminum castable and a ladle bottom working layer formed by pouring corundum spinel castable from bottom to top, and the ladle bottom is provided with air bricks and nozzle brick blocks.
In a preferred example, the thickness of the heat insulation layer is 10-30mm, the thickness of the cladding wall permanent layer is 70-120mm, the thickness of the cladding bottom permanent layer is 130-230mm, the thickness of the melting pool working layer is 120-260 mm, the thickness of the slag line working layer is 150-350 mm, and the thickness of the cladding bottom working layer is 200-350 mm.
Wherein, because the corrosion mechanism of each region in the ladle wall working layer has great difference, the molten pool working layer adopts corundum spinel precast block or corundum spinel castable, and the slag line adopts magnesia carbon brick.
The invention also provides a refractory material masonry method of the square and round ladle, which comprises the following steps:
building a heat insulation layer: the heat-insulation plates are pasted on the inner wall of the steel shell by adopting aluminum-magnesium fire clay, so that the heat-insulation plates are ensured to be compacted and paved at staggered joints among layers; the heat-insulating board adopts a light microporous corundum prefabricated block or a high-strength light heat-insulating board;
building a permanent layer: uniformly welding Y-shaped anchoring parts at intervals of 200-300 mm before a permanent layer of a ladle bottom is not poured, reserving a gas permeable brick and a nozzle brick hole mould for arrangement, adopting a high-aluminum pouring material for the ladle bottom, adding 5-7wt% of water, horizontally vibrating by using a vibrating rod, curing for 16h after the pouring is finished, putting a square circular tire membrane of the permanent layer after the permanent layer of the bottom has strength, pouring a permanent layer of a ladle wall, adopting the high-aluminum pouring material for the ladle wall, centering the square circular tire membrane, ensuring that the thickness of the permanent layer of the ladle body is uniform and reaches the standard, and baking for 24h to preserve heat to 500 ℃ after 24h of natural curing 24h inside the membrane and 24h of natural curing outside the membrane;
building a working layer of a molten pool: when a ladle wall molten pool working layer is built, aluminum magnesium cement is adopted to level a ladle bottom permanent layer, and a certain inclination is smeared, so that the lowest ring of bricks are built to be flat, because the section of a steel ladle is square and round, the arc section 1 is built by adopting the brick type 1 and the brick type 2, the arc section 2 is built by adopting the brick type 1 and the brick type 3, the gap between the back of a brick body and the permanent layer is less than or equal to 3mm, the brick joint between the two adjacent bricks is less than or equal to 1mm, the brick joint between the upper and lower rings of bricks is staggered, the brick joint between the rings of bricks is less than or equal to 1mm, the brick joint is filled by the aluminum magnesium cement, and a corundum spinel precast block is adopted as a molten pool working lining; brick type 1 taper: 2.0-3.0 degrees, brick type 2 taper: 4.0-10.0 degrees, brick type 3 taper: 0.5-2.0 °;
building a slag line working layer: adopting magnesium-aluminum fire clay for building, building the section of the steel ladle into a square circle, building the arc section 1 by adopting a brick type 1 and a brick type 2, building the arc section 2 by adopting a brick type 1 and a brick type 3, wherein the gap between the back of a brick body and a permanent layer is less than or equal to 3mm, the brick joint between two adjacent bricks is less than or equal to 1mm, staggering the brick joints between an upper ring brick and a lower ring brick, the brick joint between the ring bricks is less than or equal to 1mm, and adopting magnesia carbon bricks as a slag line working layer;
building a ladle opening: welding a ladle opening flange pressing plate at a position 50-70mm away from the upper brick surface of the slag line, wherein the pressing plate is a steel plate with the thickness of 20-25mm, the two sides of the steel plate are fully welded, the pressing plate and the slag line magnesia carbon brick are filled with plastic, and the plastic covers the upper surface of the flange and a ladle opening steel shell;
building a bottom working layer: and arranging air bricks and nozzle pocket bricks, pouring a ladle bottom working layer by adopting corundum spinel castable, vibrating by using a vibrating rod, leveling after full exhaust, baking after pouring is finished and natural curing is carried out for 24 hours, and baking and preserving heat to 1000 ℃ after 24 hours.
In a preferable example, in the building of the permanent layer, high-aluminum castable is adopted, water is added according to the mass fraction by 6%, and the material is discharged after the water is added for stirring for 3-5min each time.
In a preferable example, in the building of the ladle bottom working layer, corundum spinel castable is adopted, water is added according to the mass fraction by 4.5%, and the material is discharged after the water is added for stirring for 3-5min each time.
In a preferred embodiment, the particle size of the aluminum-magnesium fire clay particles<1mm, the component of the aluminum-magnesium fire clay is Al2O3: 65wt.%, MgO: 25 wt.%, the other 10 wt.%.
In a preferred example, the working layer of the molten pool adopts aluminum magnesium fire clay to build corundum spinel precast blocks. Because of the steel ladle cross section is square circular, arc section 1 adopts brick type 1 and brick type 2 to build by laying bricks or stones, and arc section 2 adopts brick type 1 and brick type 3 to build by laying bricks or stones, 1 tapering of brick type: 2.0-3.0 degrees, brick type 2 taper: 4.0-10.0 degrees, brick type 3 taper: 0.5-2.0 degrees.
In a preferred example, the arc section 1 and the arc section 2 are built by adopting the combination of a brick type 1, a brick type 2 and a brick type 3, when the building height of each layer is 230mm, the working layer of a molten pool is built by 12-13 layers, and the working layer of a slag line is built by 6-7 layers; when the masonry height of each layer is 100mm, the masonry of the working layer of the molten pool is 27-30 layers, and the masonry of the working layer of the slag line is 14-16 layers.
In a preferred example, the thickness of a first layer from bottom to top in a working layer of the molten pool is smaller than that of a second layer, and the thickness of the two layers of brick shapes forms a concave-convex structure to prevent the ladle bottom castable from falling off.
Compared with the prior art, the invention has the main advantages that:
the square-round ladle provided by the invention is formed by reforming a round ladle, the height of a steel shell, the distance between trunnions, the positioning sizes of a ladle bottom air brick and a nozzle brick cup and the working thickness of a refractory material are not changed, and the ladle can be fully expanded by small-scale effective reforming, so that the molten steel loading capacity is increased, the requirements of refining and continuous casting processes are met, the production efficiency of steelmaking is improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of a round ladle (A-A is a front view of an original round steel ladle, and B-B is a cross-sectional top view of the original round ladle);
FIG. 2 is a schematic diagram of a square-round ladle (C-C is a front view of the square-round ladle, and D-D is a cross-sectional top view of the square-round ladle);
FIG. 3 and FIG. 4 are schematic diagrams of a ladle wall working layer in a square-round ladle being horizontally built by using a molten pool precast block and a slag line magnesia carbon brick being vertically built;
FIG. 5 is a schematic cross-sectional view of a slag line working layer of a ladle wall of the square-round ladle in FIG. 2;
FIG. 6 is a schematic diagram of the brick type dimension of the wall-covering working layer;
in the figure:
1, steel shell; 2, a heat insulation layer; 3 a permanent layer; 4 a molten pool working layer; 5, a slag line working layer; 6, covering the opening; 7, wrapping a bottom working layer; 8, air bricks; 9 nozzle brick cup.
Detailed Description
The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
Taking the masonry of a 300-ton ladle as an example,
ladle transformation basicThe method comprises the following steps: the distance between the upper openings of two opposite circular arc sections 1 in the design of the circular steel ladle shown in figure 1 is increased by 376mm (the distance is increased from 4624mm to 5000mm), the distance between the upper openings of two opposite circular arc sections 2 is still 4624mm, and the section of the steel ladle is composed of 4 groups of circular arc sections 1 (the angle is theta)162.86 °, radius R11600 mm) and 4 sets of arc segments 2 (angle: theta227.14 degrees and radius 4312mm), as shown in fig. 2, the steel shell is manufactured in the same way as the long round ladle, the angle of the circular arc section is kept unchanged, and the ladle can contain 320 tons of molten steel after being transformed.
The masonry method of the refractory material of the square and round steel ladle comprises the following steps: as shown in figure 2, a heat insulation layer 2 is firstly built, aluminum magnesium fire clay is adopted to be attached to the inside of a fully repaired steel ladle to be applied to the heat insulation layer 2, the heat insulation layer 2 and a steel shell are ensured to be filled firmly, staggered joints are paved among layers, the heat insulation layer 2 is a light microporous corundum precast block, the strength is high, the heat insulation effect is good, the thickness of the heat insulation layer 2 is controlled to be 18mm, and the thickness of the light microporous corundum precast block is 18 mm.
And then pouring a ladle bottom permanent layer 3 at the bottom of the ladle, uniformly welding Y-shaped anchoring parts at intervals of 200-300 mm before the ladle bottom permanent layer is poured, reserving air bricks and a nozzle block hole die for arrangement, adopting high-aluminum pouring materials for the ladle bottom, adding 6 wt% of water, horizontally vibrating by adopting a vibrating rod, and maintaining for 16 hours after the pouring, wherein the pouring thickness of the ladle bottom permanent layer is 150 mm.
Then building a permanent layer 3 of the ladle wall, after the permanent layer at the bottom has strength, putting a square circular tire mold of the permanent layer of the ladle wall, and pouring the permanent layer of the ladle wall, wherein the ladle wall is made of high-aluminum casting material, the square circular tire mold needs to be centered, and the corresponding circular arc section 1 and circular arc section 2 are positioned to ensure that the thickness of the permanent layer of the ladle body is uniform and reaches the standard, the pouring thickness of the permanent layer of the ladle wall is 80mm, and after 24 hours of natural curing in the mold and 24 hours of natural curing outside the mold, the permanent layer of the ladle wall is baked for 24 hours and is kept at 500 ℃.
After the permanent layer is built, the ladle wall working layer 4 is built firstly, when the ladle wall molten pool working layer 4 is built, the aluminium magnesium cement is adopted to level the ladle bottom permanent layer, and the aluminium magnesium cement is smeared to a certain inclination, so that the lowest ring of bricks are built to be flat, the thickness of the first layer of bricks of the molten pool working layer from bottom to top is smaller than that of the second layer of bricks, the thicknesses of the two layers of bricks form a concave-convex structure, because the section of the steel ladle is square and circular, the arc section 1 is built by adopting the brick type 1 and the brick type 2, the arc section 2 is built by adopting the brick type 1 and the brick type 3, the gap between the back of the brick body and the permanent layer is less than or equal to 3mm, the gap between the two adjacent bricks is less than or equal to 1mm, the brick joints between the upper ring of bricks are staggered, the ring brick joints are less than or equal to 1mm, the aluminium magnesium cement is adopted to fill the brick joints, and corundum spinel precast blocks are adopted as the molten pool working lining. The thickness of building by laying bricks or stones of molten bath working layer is 120 and supplyes 240mm, and arc section 1 adopts brick type 1 and brick type 2 to build by laying bricks or stones, and arc section 2 adopts brick type 1 and brick type 3 to build by laying bricks or stones, and every layer is built by laying bricks or stones highly and is 230mm, 1 tapering of brick type: 2.7 degrees, brick type 2 taper: 6.1 degrees, brick type 3 taper: 0.7 degree, L1 length near permanent layer end, L2 length near molten steel end, L3 working thickness, H masonry height (figure 6).
And a ladle wall slag line working layer 5 is built in the same way, magnesium-aluminum fire clay is used for building, the section of the steel ladle is square and round, the arc section 1 is built by adopting a brick type 1 and a brick type 2, and the arc section 2 is built by adopting a brick type 1 and a brick type 3. Arc section 1 adopts brick type 1 and 2 to build by laying bricks or stones, and arc section 2 adopts brick type 1 and 3 to build by laying bricks or stones of brick type (fig. 5), and every layer is built by laying bricks or stones highly and is 230mm, 1 tapering of brick type: 2.7 degrees, brick type 2 taper: 4.9 degrees, brick type 3 taper: 0.6 degree, L1 is the length near the permanent layer end, L2 is the length near the molten steel end, L3 is the working thickness, and H is the masonry height.
When the masonry heights of the molten pool working layer and the slag line working layer are 230mm, 13 layers of precast blocks of the molten pool working layer are masonry, and 7 layers of magnesia carbon bricks of the slag line working layer are masonry (figure 2); when the building height of the working layer of the molten pool is 100mm and the building height of the working layer of the slag line is 230mm, 28 layers of precast blocks of the working layer of the molten pool are built, and 7 layers of magnesia carbon bricks of the working layer of the slag line are built (figure 3); when the masonry height of the working layer of the molten pool and the working layer of the slag line is 100mm, the precast blocks of the working layer of the molten pool are masonry for 28 layers, and the magnesia carbon bricks of the working layer of the slag line are masonry for 16 layers (figure 4).
And (3) building a ladle opening 6, welding a ladle opening flange pressing plate at a height position which is 50-70mm away from the upper brick surface of the slag line, wherein a steel plate with the thickness of 20-25mm is required to be adopted by a ladle edge pressing plate, both sides of the steel plate are fully welded, the pressing plate and the slag line magnesia carbon brick are filled with plastic, and the plastic covers the upper surface of the flange and a steel ladle opening steel shell.
The ladle bottom working layer 7 is built by laying bricks, the air brick 8 and the nozzle brick cup 9 are arranged, the ladle bottom working layer is cast by adopting corundum spinel castable, the vibrating rod is used for vibrating, the air is fully exhausted and then trowelled, after the casting is finished, the ladle can be baked after natural curing is carried out for 24 hours, and the ladle bottom working layer is baked for 24 hours and is insulated to 1000 ℃.
The ladle after masonry is in a square round shape in appearance, and schematic diagrams of a round ladle and the square round ladle are shown in figures 1 and 2.
The comparison of the parameters of the round ladle and the square and round ladle is shown in table 1.
TABLE 1 round ladle and Square round ladle parameters
Because the height of the two steel ladles, the distance between the trunnions, the positioning sizes of the air brick holes at the bottom of the ladle and the water gap holes and the thickness of the refractory material of the working layer are the same, the service life of the steel ladles in operation, hoisting and overhaul is not influenced.
In the building process, the wall working layer of the square and round ladle adopts three brick types, 2 brick types are added, the square and round ladle can be built through calculation and actual building, the weight of the refractory material is increased by about 6 tons, and the molten steel loading capacity is increased by 20 tons under the condition that the clearance height is close to the height.
The square and round ladle of the invention uses 150 furnaces with the overhaul ladle age reaching 140-.
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A square-round ladle is characterized in that the ladle is formed by reforming a round ladle, the height of a steel shell, the distance between trunnions, the positioning of a gas brick hole and a water gap hole at the bottom of the ladle are not changed, and the cross section of a ladle wall is formed by splicing 4 circular arc sections 1 and 4 circular arc sections 2 alternately;
angle theta of arc segment 11Angle theta to the circular arc segment 22The sum is 90 degrees;
on the cross section of the same ladle wall, the radius R1 of the circular arc section 1 is 0.5-0.8 times of the radius R of the circular ladle on the cross section of the ladle wall with the same height, and the radius R2 of the circular arc section 2 is 1.5-2.5 times of the radius R of the circular ladle on the cross section of the ladle wall with the same height.
2. The ladle according to claim 1, wherein the angle θ of the circle segment 2 is2Is 20-40 degrees.
3. The square-round ladle according to claim 1, wherein the square-round ladle has a larger upper mouth and a smaller lower mouth, the ladle wall sequentially comprises a steel shell (1), a heat insulation layer (2) built by a heat insulation plate, a ladle wall permanent layer (3) cast by a high-alumina castable, a molten pool working layer (4) built by corundum spinel precast blocks, a slag line working layer (5) built by magnesia carbon bricks, and a ladle mouth (6) built by a plastic material from outside to inside, the ladle bottom sequentially comprises a ladle bottom permanent layer cast by the high-alumina castable, a ladle bottom working layer (7) cast by the corundum spinel castable, and the ladle bottom is provided with air bricks (8) and nozzle brick holders (9).
4. The square-round ladle of claim 3, wherein the thickness of the heat insulation layer (2) is 10-30mm, the thickness of the wall permanent layer (3) is 70-120mm, the thickness of the ladle bottom permanent layer (3) is 130-230mm, the thickness of the molten pool working layer (4) is 120-240mm, the thickness of the slag line working layer (5) is 150-260mm, and the thickness of the ladle bottom working layer (7) is 200-350 mm.
5. The method for laying refractory of a square-round ladle according to any one of claims 1 to 4, comprising the steps of:
building a heat insulation layer: the heat-insulation plates are pasted on the inner wall of the steel shell by adopting aluminum-magnesium fire clay, so that the heat-insulation plates are ensured to be compacted and paved at staggered joints among layers; the heat-insulating board adopts a light microporous corundum prefabricated block or a high-strength light heat-insulating board;
building a permanent layer: uniformly welding Y-shaped anchoring parts at intervals of 200-300 mm before a permanent layer of a ladle bottom is not poured, reserving air bricks and brick holes of a water faucet seat, adopting high-aluminum pouring materials for the ladle bottom, adding 5-7wt% of water, horizontally vibrating by using a vibrating rod, curing for 16h after the pouring is finished, putting a square circular tire membrane of the permanent layer after the permanent layer of the bottom has strength, pouring a permanent layer of a ladle wall, adopting the high-aluminum pouring materials for the ladle wall, centering the square circular tire membrane, and ensuring that the thickness of the permanent layer of the ladle body is uniform and reaches the standard through corresponding arc sections 1 and 2, and baking for 24h after 24h of natural curing inside the membrane and 24h of natural curing outside the membrane, and keeping the temperature to 500 ℃;
building a working layer of a molten pool: when a ladle wall molten pool working layer is built, aluminum magnesium cement is adopted to level a ladle bottom permanent layer, and a certain inclination is smeared, so that the lowest ring of bricks are built to be flat, because the section of a steel ladle is square and round, an arc section 1 is built by adopting a brick type 1 and a brick type 2, an arc section 2 is built by adopting a brick type 1 and a brick type 3, the gap between the back of a brick body and the permanent layer is less than or equal to 3mm, the brick joint between two adjacent bricks is less than or equal to 1mm, the brick joints between the upper and lower rings of bricks are staggered, the brick joints of the rings of bricks are less than or equal to 1mm, the brick joints are filled by adopting the aluminum magnesium cement, and corundum spinel precast blocks are adopted as the molten pool working layer; brick type 1 taper: 2.0-3.0 degrees, brick type 2 taper: 4.0-10.0 degrees, brick type 3 taper: 0.5-2.0 °;
building a slag line working layer: adopting magnesium-aluminum fire clay for building, building the section of the steel ladle into a square circle, building the arc section 1 by adopting a brick type 1 and a brick type 2, building the arc section 2 by adopting a brick type 1 and a brick type 3, wherein the gap between the back of a brick body and a permanent layer is less than or equal to 3mm, the brick joint between two adjacent bricks is less than or equal to 1mm, staggering the brick joints between an upper ring brick and a lower ring brick, the brick joint between the ring bricks is less than or equal to 1mm, and adopting magnesia carbon bricks as a slag line working layer;
building a ladle opening: welding a ladle opening flange pressing plate at a position 50-70mm away from the upper brick surface of the slag line, wherein the pressing plate is a steel plate with the thickness of 20-25mm, the two sides of the steel plate are fully welded, the pressing plate and the slag line magnesia carbon brick are filled with plastic, and the plastic covers the upper surface of the flange and a ladle opening steel shell;
building a bottom working layer: arranging air bricks and nozzle brick blocks, pouring a ladle bottom working layer by adopting corundum spinel castable, vibrating by using a vibrating rod, leveling after full exhaust, baking after pouring is finished and natural curing is carried out for 24 hours, and baking and insulating for 24 hours to 1000 ℃.
6. The method for building the refractory material according to claim 5, wherein the permanent layer is built by adopting a high-alumina castable, 6% of water is added according to the mass fraction, and the refractory material is discharged after being stirred for 3-5min each time after being added with water.
7. The method for building the refractory material according to claim 5, wherein the corundum spinel castable is adopted in the building of the ladle bottom working layer, 4.5% of water is added according to the mass fraction, and the corundum spinel castable is discharged after being stirred for 3-5min by adding water each time.
8. The method of laying refractory of claim 5, wherein the Al-Mg fireclay particles are of a size range<1mm, the component of the aluminum-magnesium fire clay is Al2O3: 65wt.%, MgO: 25 wt.%, the other 10 wt.%.
9. The refractory material masonry method according to claim 5, wherein the arc sections 1 and 2 are masonry by adopting the combination of brick type 1, brick type 2 and brick type 3, when the masonry height of each layer is 230mm, the working layer masonry of the molten pool is 12-13 layers, and the working layer masonry of the slag line is 6-7 layers; when the masonry height of each layer is 100mm, the masonry of the working layer of the molten pool is 27-30 layers, and the masonry of the working layer of the slag line is 14-16 layers.
10. The method for laying refractory according to claim 5, wherein the thickness of the first layer from bottom to top in the working layer of the molten pool is smaller than that of the second layer, and the two layers of brick-shaped thickness form a concave-convex structure to prevent the ladle bottom castable from falling off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110569385.3A CN113333724B (en) | 2021-05-25 | 2021-05-25 | Square-round steel ladle and refractory material building method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110569385.3A CN113333724B (en) | 2021-05-25 | 2021-05-25 | Square-round steel ladle and refractory material building method thereof |
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| CN113333724A CN113333724A (en) | 2021-09-03 |
| CN113333724B true CN113333724B (en) | 2022-04-08 |
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| CN202110569385.3A Active CN113333724B (en) | 2021-05-25 | 2021-05-25 | Square-round steel ladle and refractory material building method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60239604A (en) * | 1984-05-14 | 1985-11-28 | Sumitomo Metal Ind Ltd | Estimation of residual thickness of lining refractory material of molten metal vessel |
| CN201136050Y (en) * | 2007-12-29 | 2008-10-22 | 中冶东方工程技术有限公司上海分公司 | Ladle |
| CN102430749A (en) * | 2011-12-31 | 2012-05-02 | 大冶特殊钢股份有限公司 | Elliptical steel ladle and manufacturing method thereof |
| CN106735151A (en) * | 2016-12-29 | 2017-05-31 | 山东钢铁股份有限公司 | The compound building method of ladle builds ladle by laying bricks or stones with compound |
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2021
- 2021-05-25 CN CN202110569385.3A patent/CN113333724B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60239604A (en) * | 1984-05-14 | 1985-11-28 | Sumitomo Metal Ind Ltd | Estimation of residual thickness of lining refractory material of molten metal vessel |
| CN201136050Y (en) * | 2007-12-29 | 2008-10-22 | 中冶东方工程技术有限公司上海分公司 | Ladle |
| CN102430749A (en) * | 2011-12-31 | 2012-05-02 | 大冶特殊钢股份有限公司 | Elliptical steel ladle and manufacturing method thereof |
| CN202461497U (en) * | 2011-12-31 | 2012-10-03 | 大冶特殊钢股份有限公司 | Oval steel ladle |
| CN106735151A (en) * | 2016-12-29 | 2017-05-31 | 山东钢铁股份有限公司 | The compound building method of ladle builds ladle by laying bricks or stones with compound |
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| CN113333724A (en) | 2021-09-03 |
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