A type of lead-removing brick

Abstract

This application relates to a lead-removing brick, belonging to the field of iron and steel smelting technology. It includes a brick body in the shape of a truncated pyramid, with multiple narrow lead-removing channels of equal height within the brick body. These channels extend from the top surface to the bottom surface of the brick body and are used for discharging molten lead. Grooves are provided on the four side walls of the brick body, and a settling groove communicating with the lead-removing channels is located on the bottom surface. This application, by setting up narrow lead-removing channels, utilizes the surface tension difference between molten steel and molten lead to allow only molten lead to pass through, preventing molten steel from seeping into the channels. This significantly reduces the risk of steel leakage due to lead accumulation and improves production safety.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting technology, and in particular to a lead-removing brick. Background Technology

[0002] Free-cutting steels are mainly classified into sulfur-based, lead-based, calcium-based, and composite types based on the free-cutting elements they contain. Among them, lead-based free-cutting steels exhibit excellent machinability under conventional cutting conditions. Lead in steel primarily precipitates as a phase at grain boundaries. During cutting, the molten lead particles effectively lubricate the tool-workpiece contact surface and promote chip breakage, thereby significantly improving the steel's machinability and reducing tool wear. Therefore, lead-based free-cutting steels are widely used in the manufacture of precision instruments, automotive parts, and various mechanical components.

[0003] However, in the production of lead-based free-cutting steels, lead, with a density much greater than molten steel, easily accumulates at the bottom of the tundish. When the tundish reaches the middle to late stages of its lifespan, a large amount of molten lead accumulated at the bottom can seep into the crystallizer through the gaps between the tundish nozzle seat bricks and the refractory lining (or through the joint between the submerged entry nozzle and the nozzle seat bricks), causing serious steel leakage accidents. Furthermore, if the lead remaining at the bottom of the ladle is not completely removed during the next repair, it can contaminate the molten steel during the production of other steel grades, leading to surface quality defects in the billets. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a lead-removing brick.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a lead-removing brick, including a brick body, the brick body is in the shape of a quadrangular frustum, and multiple narrow lead-removing channels with a height equal to the height of the brick body are provided in the brick body. The narrow lead-removing channels run from the top surface of the brick body to the bottom surface of the brick body. The narrow lead-removing channels are used for lead liquid discharge. Grooves are provided on the four sides of the brick body, and a sinkhole communicating with the narrow lead-removing channels is provided on the bottom surface of the brick body.

[0006] Furthermore, the width of the slit lead removal channel is 0.2–0.4 mm, and the length is 10–20 mm.

[0007] Furthermore, the number of the slit lead removal channels is 20 to 40.

[0008] Furthermore, the multiple slit lead-removing channels are arranged in a quincunx pattern or a rectangular array.

[0009] Furthermore, the multiple slit lead removal channels are distributed in a ring-shaped radial pattern.

[0010] Furthermore, the brick body is made of corundum, chrome corundum, corundum spinel, or chrome corundum spinel.

[0011] Furthermore, the brick is placed inside the working lining of the tundish, and the bottom surface of the brick is in contact with the upper end of the bottom steel plate of the tundish. A working lining pad is provided between the working lining and the brick, and a lead discharge hole communicating with the settling trough is provided through the bottom of the bottom steel shell of the tundish.

[0012] Furthermore, the working liner layer is made of magnesium dry vibratory material.

[0013] The beneficial effects of this application are as follows: 1. By setting a narrow lead-removing channel with a width of 0.2 to 0.4 mm, this application utilizes the surface tension difference between molten steel and molten lead to allow only molten lead to pass through, preventing molten steel from seeping into the channel, greatly reducing the risk of steel leakage due to lead enrichment, and improving production safety.

[0014] 2. The grooved structure around the brick significantly increases its contact area and interlocking strength with the surrounding magnesium dry vibrating material, extends the possible seepage path of molten lead, and effectively prevents the lead-removing brick from floating due to thermal stress or molten steel flow during use, ensuring structural stability and reliability.

[0015] 3. Multiple through-type narrow lead discharge channels provide a smooth discharge path for molten lead. Combined with settling tanks and lead discharge holes, the lead discharge efficiency is greatly improved, effectively reducing the retention of molten lead in the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a top view of the present invention.

[0018] Figure 3 This is an installation diagram of this utility model.

[0019] Illustration markings: 1. Brick body, 11. Settling trough, 2. Slit lead removal channel, 3. Groove, 4. Working liner layer, 5. Working liner, 6. Bottom steel plate, 7. Lead removal hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Please see Figure 1-3 This utility model embodiment provides a lead-removing brick, including a brick body 1. The brick body 1 is shaped like a truncated pyramid, which helps to resist the buoyancy of molten steel and prevent drifting. The brick body 1 has multiple narrow lead-removing channels 2 with a height equal to that of the brick body 1. The narrow lead-removing channels 2 extend from the top surface of the brick body 1 to the bottom surface of the brick body 1 and are used for the discharge of molten lead. The side walls of the brick body 1 are provided with grooves 3, and the bottom surface of the brick body 1 is provided with a sinkhole 11 that communicates with the narrow lead-removing channels 2.

[0022] The slit lead-discharging channel 2 has a width of 0.2–0.4 mm and a length of 10–20 mm. Specifically, the width of the slit lead-discharging channel 2 is 0.3 mm. The number of slit lead-discharging channels 2 is 20–40. The slit lead-discharging channel 2 allows high-density molten lead to be smoothly discharged downwards under capillary action or gravity, while effectively preventing molten steel penetration due to its millimeter-level slits. Multiple slit lead-discharging channels 2 are arranged in a rectangular array to ensure coverage of most of the upper surface of the brick body 1, achieving uniform collection and discharge of molten lead. The brick body 1 is made of corundum, chromium corundum, corundum spinel, or chromium corundum spinel.

[0023] Furthermore, the bottom surface of the brick 1 contacts the upper end of the bottom steel plate 6 of the intermediate ladle, and a working lining layer 4 is provided between the working lining 5 and the brick 1. A lead-removing hole 7, communicating with the settling trough 11, is provided through the bottom of the ladle bottom steel shell. There are multiple lead-removing holes 7. The working lining layer 4 is made of magnesium-based dry vibratory material. The lead-removing holes 7 are connected to a collection container.

[0024] The brick 1 is placed inside the working liner 5 of the tundish, with the upper surface of the brick 1 lower than the upper surface of the working liner 5. By setting the groove 3, the contact area and interlocking strength between the lead-removing brick and the subsequently filled magnesium dry vibratory material 4 are significantly increased, forming a firm mechanical anchor and preventing the lead-removing brick from shifting or floating under thermal shock or steel flow impact.

[0025] During the production of lead-removable bricks, a slit filler made of a flammable material is fixed inside the lead-removable brick forming mold according to the aforementioned slit lead-removal channel 2 structure. The flammable material is wax thread or plastic fiber. The slit lead-removal channel 2 structure includes the number, direction, position, and size of the lead-removal channels 2. Release oil is uniformly coated on the surface of the slit filler; corundum refractory castable is injected into the mold for casting to obtain a green lead-removable brick; after curing and demolding, the slit filler is carefully removed; the green lead-removable brick is then subjected to drying and high-temperature firing treatments to finally obtain the lead-removable brick.

[0026] During lead removal brick installation, place brick 1 on the bottom steel plate 6, ensuring that the settling trough 11 covers multiple lead removal holes 7. Leave a 20-40mm gap between the side walls of brick 1 and the working liner 5 for filling with magnesium dry vibratory material. Cover the top of brick 1 with a 3-5mm thick layer of yellow straw paper, and fill the gaps around brick 1 with magnesium dry vibratory material. The yellow straw paper effectively prevents particles from scattering during dry material filling from clogging the entrance to the narrow lead removal channel 2.

[0027] During the casting of lead-based free-cutting steel, molten lead, with a density much greater than that of molten steel, gradually settles and accumulates at the bottom of the tundish, and then deposits on the upper surface of the brick body 1. Under pressure difference or capillary action, the accumulated molten lead preferentially enters the narrow lead-discharge channel 2 at the top of the brick body 1. Since the width of the narrow lead-discharge channel 2 is only 0.3 mm, molten steel cannot enter due to surface tension, thus effectively blocking the molten steel. The molten lead can then flow smoothly downwards along the narrow lead-discharge channel 2, and after collection, it is discharged through the lead-discharge hole 7 on the bottom steel plate 6 to an external collection container, thereby eliminating the risk of leakage and contamination caused by lead accumulation at the bottom of the ladle.

[0028] Of course, this utility model is not limited to the embodiments described above. Several other embodiments based on the design concept of this utility model are also provided below.

[0029] For example, in other embodiments, unlike the embodiments described above, the multiple slit lead removal channels 2 are arranged in a quincunx pattern.

[0030] For example, in other embodiments, unlike the embodiments described above, the multiple slit lead removal channels 2 are distributed in a ring-shaped radial pattern.

[0031] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A lead-removing brick, characterized in that, Includes a brick body (1), which is in the shape of a quadrangular frustum. The brick body (1) has multiple narrow lead-removing channels (2) with the same height as the brick body (1). The narrow lead-removing channels (2) run from the top surface of the brick body (1) to the bottom surface of the brick body (1). The narrow lead-removing channels (2) are used for the discharge of lead liquid. The brick body (1) has grooves (3) on its four sides. The bottom surface of the brick body (1) has a sinkhole (11) that communicates with the narrow lead-removing channels (2).

2. The lead-removing brick according to claim 1, characterized in that, The slit lead removal channel (2) has a width of 0.2 to 0.4 mm and a length of 10 to 20 mm.

3. A lead-removing brick according to claim 1, characterized in that, The number of the slit lead removal channels (2) is 20 to 40.

4. A lead-removing brick according to claim 1, characterized in that, Multiple slit lead-removing channels (2) are arranged in a plum blossom pattern or a rectangular pattern.

5. A lead-removing brick according to claim 1, characterized in that, Multiple narrow lead removal channels (2) are distributed in a ring-shaped radial pattern.

6. A lead-removing brick according to claim 1, characterized in that, The brick body (1) is made of corundum, chrome corundum, corundum spinel or chrome corundum spinel.

7. A lead-removing brick according to claim 1, characterized in that, The brick (1) is placed inside the working liner (5) of the intermediate tundish, and the bottom surface of the brick (1) is in contact with the upper end of the bottom steel plate (6) of the intermediate tundish. A working liner layer (4) is provided between the working liner (5) and the brick (1). A lead discharge hole (7) communicating with the sinker (11) is provided through the bottom of the bottom steel shell.

8. A lead-removing brick according to claim 7, characterized in that, The working liner layer (4) is made of magnesium dry vibratory material.

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