Process for improving casting self-flow rate of molten steel in steel ladle

Abstract

The invention discloses a process for improving the casting self-flow rate of molten steel in a steel ladle, which belongs to the technical field of metallurgy and comprises the following steps: 1, increasing the volume of an upper nozzle in a pocket block of a nozzle of the steel ladle, enabling the sum of the heights of an upper opening and an upper straight channel in the upper nozzle to be 225-245mm, and enabling the diameter of the top end of the upper opening to be 210-220mm; the height of the upper straight channel ranges from 60 mm to 70 mm, and the diameter of the upper straight channel ranges from 90 mm to 95 mm. The diameter of the lower straight channel is 60mm; 2, optimizing the masonry of the ladle nozzle pocket block, and cleaning the mounting foundation plate of the ladle nozzle pocket block; the method comprises the following steps: mounting a ladle nozzle seat brick on a ladle nozzle foundation plate, and finding out a masonry horizontal line at a position which is 30-50mm away from the ladle nozzle seat brick; the non-impact area bricks and the impact area bricks are sequentially built with the horizontal line as the standard till the permanent layer of the wall of the steel ladle is built; after bottom ladle bricks are built, the bricks are tightly plugged; a gap between the ladle nozzle pocket block and the ladle bottom brick is filled with castable and tamped; a gap between the ladle bottom brick and the ladle wall is filled with castable and tamped; the process is simple and feasible, and effectively improves the molten steel self-flowing rate.

Description

Technical Field

[0001] The invention relates to a process for pouring molten steel, in particular to a process for improving the self-flow rate of molten steel pouring in a ladle, and belongs to the technical field of metallurgy. Background Art

[0002] As competition in the steel market becomes increasingly fierce, higher requirements are placed on the product quality of enterprises. One of the links that affects the quality of molten steel is the self-flow of molten steel in the ladle, that is, the automatic pouring of molten steel in the continuous casting process. If the molten steel does not pour automatically in the continuous casting process, the water nozzle oxygen burning operation must be implemented. This operation will increase the oxygen content in the steel and increase the number of inclusions, affecting the quality of the ingot. In severe cases, it may even cause the continuous casting machine to stop pouring, causing a disorder in the production rhythm.

[0003] At present, in terms of controlling the self-flow of molten steel in the ladle, the refractory drainage sand used for steel tapping is generally improved. For example, the method of improving the self-flow rate of slab ladle in patent CN115502382A adds drainage sand into the ladle, optimizes the index of slab drainage sand by studying the self-flow pouring mechanism of molten steel in the ladle, adopts a special formula, improves the self-flow rate of the ladle, improves the automatic pouring rate of the casting machine, and reduces the labor intensity and oxygen consumption. By improving the self-flow rate of steel grades, reducing the secondary oxidation of molten steel, improving the quality of molten steel, reducing the loss of drainage change, and improving the problem of low self-flow rate of existing slab ladle, but the cost of improving the drainage sand is large and the process is complicated.

[0004] Patent CN115592106A discloses a method for improving the self-flow rate of the continuous casting tundish during pouring, which solves the problem of low self-flow rate of the tundish during pouring, the labor-intensive manual oxygen burning and drainage, the molten steel pollution, the burns to the upper water inlet caused by oxygen burning and drainage, and the short use time of the tundish during pouring. However, the height of the upper opening and the upper straight channel still adopt the existing technology, resulting in a short downward impact distance, a low amount of molten steel added, and a low self-flow rate of molten steel under the same working conditions.

[0005] Therefore, developing a process for increasing the self-flow rate of molten steel in a ladle that can overcome the above defects has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a process for improving the self-flow rate of molten steel in a ladle. The process is simple and easy to operate, effectively improves the self-flow rate of molten steel, and ensures the quality of molten steel.

[0007] In order to solve the above technical problems, the present invention provides a process for improving the self-flow rate of molten steel in a ladle, which specifically comprises the following steps: 1. The volume of the upper nozzle in the ladle nozzle seat brick increases An upper water inlet is detachably provided in a ladle water inlet seat brick with a flow channel. The upper water inlet comprises an upper water inlet seat brick, an upper opening, an upper straight channel, a lower opening and a lower straight channel. The upper opening and the lower opening are respectively inverted truncated cone structures. The upper straight channel and the lower straight channel are barrel-shaped structures. The top of the upper opening is flush with the upper plane of the ladle water inlet seat brick, the lower end of the upper opening is connected with the upper straight channel, the lower end of the upper straight channel is connected with the lower opening, the lower end of the lower opening is connected with the lower straight channel, the bottom end of the lower straight channel is flush with the lower plane of the ladle water inlet seat brick, and the lower opening and the lower straight channel are located in the upper water inlet seat brick; The sum of the heights of the upper opening and the upper straight channel in the upper water inlet is 225-245 mm, and the diameter of the top of the upper opening is 210-220 mm; The height of the upper straight channel is 60-70 mm, and the diameter of the upper straight channel is 90-95 mm; The height of the lower opening is 99mm; The height of the lower straight channel is 96mm; The diameter of the lower straight channel is 60mm; 2. Optimization of brickwork for ladle nozzle Clean the installation base plate of the ladle nozzle seat brick and adjust the base plate to be flat; Install the ladle nozzle seat brick on the ladle nozzle foundation plate, and find the masonry horizontal line at a distance of 30-50mm from the ladle nozzle seat brick; Based on the horizontal line, lay 270mm non-impact area bricks and 350mm impact area bricks in sequence upwards to the permanent layer of the ladle wall; After the bottom bricks are laid, the bricks should be packed tightly; Use castables to fill and compact the gap between the ladle nozzle seat bricks and the ladle bottom bricks; use castables to fill and compact the gap between the ladle bottom bricks and the ladle wall.

[0008] The technical solution further defined in the present invention is: Furthermore, in the aforementioned process for improving the self-flow rate of molten steel in the ladle, in step 1, for every increase of 1.2 dm³ in the volume of the upper water inlet in the ladle water inlet seat brick, the amount of drainage sand increased by 10 kg.

[0009] In the aforementioned process for improving the self-flow rate of molten steel in the ladle, when laying bricks in the non-impact area and the impact area in step 2, the brick joints are ≤1mm.

[0010] In the aforementioned process for improving the self-flow rate of molten steel in a ladle, after the bricks at the bottom of the ladle are laid in step 2, the bricks are tightly plugged with triangular wedges.

[0011] In the aforementioned process for improving the self-flow rate of molten steel in the ladle, the castable in step 2 is a corundum castable.

[0012] The beneficial effects of the present invention are: Compared with the existing technology structure such asFigure 1 As shown, the present invention lengthens the height of the upper opening and the upper straight channel, which is 60-80mm higher than the general height, which can increase the smoothness of the molten steel, increase the downward impact distance, and increase the speed of the steel self-flow. The height of the upper straight channel is shortened to increase the distance of the upper opening and further increase the self-flow rate; the diameter of the upper opening is enlarged to increase the amount of molten steel added and improve efficiency; the diameter of the upper straight channel is reduced to suddenly tighten the molten steel flow and narrow it, thereby increasing the speed of the molten steel flowing downward; and at the same time, the diameter of the lower opening is increased to facilitate rapid flow and feeding.

[0013] The present invention can effectively solve the problem of low molten steel self-flow rate under the same working conditions, thereby achieving the effect of improving the molten steel self-flow rate, increasing the amount of drainage sand, and increasing the molten steel self-flow rate by 3-5%, while also achieving significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A structural schematic diagram of a ladle nozzle seat brick in the prior art is obtained; Figure 2 This is a schematic diagram of the structure of the ladle nozzle seat brick in an embodiment of the present invention; Figure 3 It is a side view of the structure obtained by brick masonry of the ladle nozzle seat in an embodiment of the present invention; Figure 4 A top view of a structure obtained by brick-laying a ladle nozzle seat in an embodiment of the present invention; In the figure: 1- ladle nozzle seat brick, 2- upper nozzle seat brick, 3- upper opening, 4- upper straight channel, 5- lower opening, 6- lower straight channel, 7- non-impact zone brick, 8-impact zone brick. DETAILED DESCRIPTION Example 1

[0015] This embodiment provides a process for improving the self-flow rate of molten steel in a ladle, the structure of which is as follows: Figure 2-4 As shown, the specific steps include: 1. The volume of the upper nozzle in the ladle nozzle seat brick increases by 1.2 dm³, and the drainage sand increases by 10Kg; A ladle nozzle seat brick 1 with a flow channel is detachably provided with an upper nozzle, which includes an upper nozzle seat brick 2, an upper opening 3, an upper straight channel 4, a lower opening 5 and a lower straight channel 6. The upper opening 3 and the lower opening 5 are respectively inverted truncated cone structures, and the upper straight channel 4 and the lower straight channel 6 are barrel-shaped structures. The top of the upper opening 3 is flush with the upper plane of the ladle nozzle seat brick 1, the lower end of the upper opening 3 is connected to the upper straight channel 4, the lower end of the upper straight channel 4 is connected to the lower opening 5, the lower end of the lower opening 5 is connected to the lower straight channel 6, the bottom end of the lower straight channel 6 is flush with the lower plane of the ladle nozzle seat brick 1, and the lower opening 5 and the lower straight channel 6 are located in the upper nozzle seat brick 2; Compared with existing technologies such as Figure 1Compared with the figure, the height of the upper opening 3 and the upper straight channel 4 in the upper water inlet increases by 60mm from 165mm to 225mm, and the diameter of the top of the upper opening 3 increases by 10mm from 200mm to 210mm; The height of the upper straight channel 4 is reduced by 55mm from 115mm to 60mm, and the diameter of the upper straight channel 4 is increased by 10mm from 80mm to 90mm; The height of the lower opening 5 is 99 mm; The height of the lower straight channel 6 is 96 mm; The diameter of the lower straight channel 6 increases by 5 mm from 55 mm to 60 mm; 2. Optimization of brickwork for ladle nozzle Clean the installation base plate of the ladle nozzle seat brick 1 and adjust the base plate to be flat; Install the ladle nozzle seat brick 1 on the ladle nozzle base plate, and find the masonry horizontal line at a position 30 mm away from the ladle nozzle seat brick; Based on the horizontal line, lay 270mm non-impact area bricks 7 and 350mm impact area bricks 8 in sequence upwards to the permanent layer of the ladle wall, with the brick joints ≤1mm; After the bottom bricks are laid, use triangular wedges to tighten the bricks; Use corundum castable to fill and tamp the gap between the ladle nozzle seat brick 1 and the ladle bottom brick; use castable to fill and tamp the gap between the ladle bottom brick and the ladle wall.

[0016] When the present invention is used, under the same working conditions, the amount of drainage sand can be increased and the self-flow rate of molten steel can be increased by 3%. Example 2

[0017] This embodiment provides a process for improving the self-flow rate of molten steel in a ladle, the structure of which is as follows: Figure 2-4 As shown, the specific steps include: 1. The volume of the upper nozzle in the ladle nozzle seat brick increases by 1.2 dm³, and the drainage sand increases by 10Kg; A ladle nozzle seat brick 1 with a flow channel is detachably provided with an upper nozzle, which includes an upper nozzle seat brick 2, an upper opening 3, an upper straight channel 4, a lower opening 5 and a lower straight channel 6. The upper opening 3 and the lower opening 5 are respectively inverted truncated cone structures, and the upper straight channel 4 and the lower straight channel 6 are barrel-shaped structures. The top of the upper opening 3 is flush with the upper plane of the ladle nozzle seat brick 1, the lower end of the upper opening 3 is connected to the upper straight channel 4, the lower end of the upper straight channel 4 is connected to the lower opening 5, the lower end of the lower opening 5 is connected to the lower straight channel 6, the bottom end of the lower straight channel 6 is flush with the lower plane of the ladle nozzle seat brick 1, and the lower opening 5 and the lower straight channel 6 are located in the upper nozzle seat brick 2; Compared with existing technologies such as Figure 1Compared with the figure, the height of the upper opening 3 and the upper straight channel 4 in the upper water inlet increases by 80mm from 165mm to 245mm, and the diameter of the top of the upper opening 3 increases by 20mm from 200mm to 220mm; The height of the upper straight channel 4 is reduced by 45mm from 115mm to 70mm, and the diameter of the upper straight channel 4 is increased by 15mm from 80mm to 95mm; The height of the lower opening 5 is 99 mm; The height of the lower straight channel 6 is 96 mm; The diameter of the lower straight channel 6 increases by 5 mm from 55 mm to 60 mm; 2. Optimization of Brick Construction of Ladle Nozzle Seat Clean the installation base plate of the ladle nozzle seat brick 1 and adjust the base plate to be flat; Install the ladle nozzle seat brick 1 on the ladle nozzle base plate, and find the masonry horizontal line at a position 50 mm away from the ladle nozzle seat brick; Based on the horizontal line, lay 270mm non-impact area bricks 7 and 350mm impact area bricks 8 in sequence upwards to the permanent layer of the ladle wall, with the brick joints ≤1mm; After the bottom bricks are laid, use triangular wedges to tighten the bricks; Use corundum castable to fill and tamp the gap between the ladle nozzle seat brick 1 and the ladle bottom brick; use castable to fill and tamp the gap between the ladle bottom brick and the ladle wall.

[0018] When the present invention is used, under the same working conditions, the amount of drainage sand can be increased and the self-flow rate of molten steel can be increased by 5%.

[0019] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A process for improving the self-flow rate of molten steel in a ladle, characterized in that: The specific steps include:

1. The volume of the upper nozzle in the ladle nozzle seat brick increases A ladle nozzle seat brick (1) with a flow channel is provided with a removable upper nozzle, the upper nozzle comprising an upper nozzle seat brick (2), an upper opening (3), an upper straight channel (4), a lower opening (5) and a lower straight channel (6), the upper opening (3) and the lower opening (5) are respectively inverted truncated cone structures, the upper straight channel (4) and the lower straight channel (6) are barrel-shaped structures, the top of the upper opening (3) is flush with the upper plane of the ladle nozzle seat brick (1), the lower end of the upper opening (3) is connected to the upper straight channel (4), the lower end of the upper straight channel (4) is connected to the lower opening (5), the lower end of the lower opening (5) is connected to the lower straight channel (6), the bottom end of the lower straight channel (6) is flush with the lower plane of the ladle nozzle seat brick (1), and the lower opening (5) and the lower straight channel (6) are located in the upper nozzle seat brick (2); The sum of the heights of the upper opening (3) and the upper straight channel (4) in the upper water inlet is 225-245 mm, and the diameter of the top of the upper opening (3) is 210-220 mm; The height of the upper straight channel (4) is 60-70 mm, and the diameter of the upper straight channel (4) is 90-95 mm; The height of the lower opening (5) is 99 mm; The height of the lower straight channel (6) is 96 mm; The diameter of the lower straight channel (6) is 60 mm; 2. Optimization of Brick Construction of Ladle Nozzle Seat Clean the installation base plate of the ladle nozzle seat brick (1) and adjust the base plate to be flat; Install the ladle nozzle seat brick (1) on the ladle nozzle base plate, and find the masonry horizontal line at a distance of 30-50 mm from the ladle nozzle seat brick; Taking the horizontal line as the reference, 270 mm non-impact area bricks (7) and 350 mm impact area bricks (8) are laid upwards in sequence until they reach the permanent layer of the ladle wall; After the bottom bricks are laid, the bricks should be packed tightly; The gap between the ladle nozzle seat brick (1) and the ladle bottom brick is filled and compacted with the castable; the gap between the ladle bottom brick and the ladle wall is filled and compacted with the castable.

2. The process for improving the self-flow rate of molten steel in ladle pouring according to claim 1, characterized in that: In the step 1, for every 1.2 dm³ increase in the volume of the upper water inlet in the ladle water inlet seat brick, the amount of drainage sand increased by 10 kg.

3. The process for improving the self-flow rate of molten steel in ladle pouring according to claim 1, characterized in that: When laying non-impact area bricks and impact area bricks in step 2, the brick joints are ≤1mm.

4. The process for improving the self-flow rate of molten steel in ladle pouring according to claim 1, characterized in that: After the bottom bricks in step 2 are laid, the bricks are tightly packed with triangular wedges.

5. The process for improving the self-flow rate of molten steel in ladle pouring according to claim 1, characterized in that: The casting material in the step 2 is corundum casting material.

Images