Tundish inclusion adsorption device

Abstract

The tundish inclusion adsorption device comprises a tundish, and a tundish cover is arranged at an opening in the top of the tundish. The tundish cover is provided with at least one tundish cover hole, and an adsorption rod extending into the tundish is inserted into the tundish cover hole. According to the device, through the arrangement of the adsorption rods, the cleanliness of molten steel can be effectively improved, the content of steel inclusions is reduced, the removal efficiency of the inclusions in the tundish is improved, nozzle nodulation is reduced, the inclusion removal effect is remarkable, the cleanliness of the molten steel is effectively improved, and the qualification rate of the inclusions and the quality of casting blanks are improved. According to the device, the inclusion removal effect of the adsorption rod is remarkable, the inclusion qualification rate and the casting blank quality are effectively improved, the adsorption rod is not exploded or broken, the offline condition is good, and the service life is synchronous with that of a tundish.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking tundish casting technology, and in particular to a device for adsorbing inclusions in tundishes. Background Technology

[0002] Improving the cleanliness of molten steel is one of the key factors in the technological reform of the steel industry. However, during use, high-melting-point non-metallic inclusions often accumulate at the tundish nozzle and submerged entry nozzle. These inclusions are mainly related to aluminum and aluminum oxide in the molten steel, and secondarily to the presence of small amounts of molten glass such as silicon dioxide and manganese oxide. Among these, aluminum oxide, titanium dioxide, and small amounts of silicon dioxide and manganese oxide directly affect the cleanliness of the molten steel. The presence of inclusions is particularly severe when casting aluminum-killed steel, aluminum-containing steel, titanium-containing steel, and rare earth steel, leading to a decrease in the production efficiency of the continuous casting machine and thus affecting the entire continuous casting process.

[0003] In the continuous casting process of steelmaking, due to the presence of inclusions and their inability to be removed, inclusions often accumulate at the tundish nozzle during casting. The most common problem is that large inclusions are removed by flotation in the tundish, but some inclusions of a certain size cannot float and are carried into the crystallizer by the molten steel, eventually remaining in the billet and reducing the quality of the clean steel product.

[0004] Improving the inclusion removal rate is one of the effective ways to improve the cleanliness of molten steel. At present, there are many mature methods for removing inclusions. Promoting the flotation and removal of inclusions through argon blowing in the tundish, using baffles to control the flow of molten steel, and calcium treatment are all effective measures to improve the cleanliness of molten steel. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a device for adsorbing impurities in intermediate packages.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the adsorption method of this utility model is as follows: it includes an intermediate package, the top opening of which is provided with a cover; the cover has at least one cover hole, and an adsorption rod extending into the intermediate package is inserted into the cover hole.

[0007] Furthermore, the adsorption rod is inserted to a position 200-300mm from the bottom of the intermediate package.

[0008] Furthermore, the capping hole is a circular hole with a diameter of 250-350 mm; the adsorption rod is cylindrical with a diameter of 200-300 mm.

[0009] Furthermore, the surface of the adsorption rod is provided with grooves.

[0010] Furthermore, the intermediate ladle has slag-retaining walls on both sides inside; the ladle cover hole is located in the area between the two slag-retaining walls.

[0011] Furthermore, the cover hole is provided with at least two holes, distributed in the area between the two slag retaining walls.

[0012] The beneficial effects of adopting the above technical solution are as follows: (1) By setting the adsorption rod, this utility model can effectively improve the cleanliness of molten steel, reduce the content of steel inclusions, improve the removal efficiency of inclusions in the tundish, reduce nozzle nodules, and significantly remove inclusions, thereby effectively improving the cleanliness of molten steel, increasing the inclusion qualification rate and billet quality.

[0013] This invention's adsorption rod has a significant effect on removing inclusions, effectively improving the inclusion qualification rate and billet quality. Moreover, the adsorption rod does not crack or break, and its condition after leaving the production line is good, synchronizing with the life of the tundish. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a front view of the adsorption rod described in this utility model;

[0017] Figure 3 This is a side view of the adsorption rod described in this utility model.

[0018] In the diagram: 1. Adsorption rod; 2. Groove; 3. Intermediate container; 4. Stopper rod; 5. Seat brick; 6. Inlet; 7. Flow stabilizer; 8. Slag retainer; 9. Cover; 10. Long inlet; 11. Injection hole. Detailed Implementation

[0019] Figure 1 As shown, this intermediate ladle impurity adsorption device includes an intermediate ladle 3, with a cover 9 at the top opening of the intermediate ladle 3. A flow stabilizer 7 is located in the middle of the intermediate ladle 3, and an injection hole 11 is located in the middle of the cover 9, directly opposite the flow stabilizer 7. A long water inlet 10 is inserted into the injection hole 11 and extends into the intermediate ladle 3. A slag-blocking wall 8 is provided between the flow stabilizer 7 and the water inlet 6 inside the intermediate ladle 3. The water inlet 6 is located at the bottom of the intermediate ladle 3 via a seat brick 5, and a stopper rod opening is provided on the cover 9 opposite the water inlet 6, into which a stopper rod 4 is inserted. At least one cover hole is provided on the cover 9, located in the area between two slag-blocking walls 8. Preferably, at least two cover holes are provided, distributed within the area between the two slag-blocking walls 8. The cover hole is preferably circular, with a diameter of 250–350 mm, preferably 300 mm.

[0020] Figure 1 As shown, an adsorption rod 1 is inserted into the cover hole of the intermediate ladle 3 in this intermediate ladle impurity adsorption device. The adsorption rod 1 is inserted between the two slag retaining walls 8, and its bottom is 200-300mm away from the bottom of the intermediate ladle. Figure 2 , 3 As shown, the adsorption rod 1 is a long, cylindrical rod, preferably cylindrical, with a size suitable for passing through the cover hole, preferably with a diameter of 200-300 mm, and most preferably 250 mm. Grooves 2, preferably rectangular, are distributed on the surface of the adsorption rod 1. These grooves increase the effective contact surface area of ​​the adsorption rod, and the molten steel generates vortices at the grooves, which is beneficial for the aggregation and adsorption of inclusions. When the molten steel passes through the grooves of the adsorption rod, the vortices formed there generate strong suction, which helps inclusions to remain, aggregate, and be adsorbed in this area. The reason for the vortex generation in the grooves is mainly due to the frictional resistance generated between the fluid and the wall surface when the molten steel flows through the grooves. Local flow separation is observed at the leading edge of the grooves, thus breaking the original boundary layer. According to Bernoulli's equation, changes in the flow velocity of a liquid will cause changes in pressure. The liquid flow velocity is lowest and the pressure is highest near the wall inside the groove. The flow velocity is higher and the pressure is lower as you get closer to the outside of the groove. Eventually, driven by the pressure difference, liquid backflow occurs, creating a vortex backflow area in the groove for the molten steel.

[0021] The adsorption method of the adsorption device for the inclusions in the intermediate tundish includes the following steps: (1) Insert and fix an adsorption rod 1 in the intermediate tundish 3, inserting it to a position where the bottom of the adsorption rod 1 is 200-300 mm away from the bottom of the intermediate tundish; preferably insert it into the intermediate tundish 3 through the cover hole, inserting it into the area between the two slag retaining walls 8, and fix the adsorption rod 1 at the position of the cover hole of the intermediate tundish.

[0022] (2) Bake the intermediate bread 3 according to the normal baking schedule, and then pour the intermediate bread after baking;

[0023] (3) During the entire casting process, the adsorption rod 1 adsorbs the inclusions in the molten steel flowing through it, thereby purifying the molten steel.

[0024] The adsorption principle of the casting process is as follows: Inclusions in the molten steel, and inclusions encased in air bubbles, collide with the adsorption rods and rectangular groove walls in the tundish. After the collision, some inclusions are adsorbed onto the adsorption rods, while others bounce off. The bounced inclusions may be adsorbed by the adsorption rods due to further collisions. Inclusions contact and react with the adsorption rods and rectangular groove walls to form complex compounds, such as high-melting-point salts. These complex compounds adhere to the adsorption rods and are not easily detached. If the molten steel from the tundish has a high purity, the adsorption rods do not need to be replaced in a single casting process and can be reused. Conversely, if the molten steel is of poor quality and not required to be particularly pure, many inclusions will accumulate and adhere to the adsorption rods and rectangular groove walls after a period of casting. In such cases, the adsorption rods should be removed promptly, the inclusions on the rods treated, or a new adsorption rod should be inserted back into the tundish for continued use.

Claims

1. A device for adsorbing impurities in intermediate packages, characterized in that: The intermediate package (3) includes a top opening with a cover (9); the cover (9) has at least one cover hole, and an adsorption rod (1) is inserted into the intermediate package (3); the surface of the adsorption rod is provided with grooves.

2. The tundish inclusion adsorbing device according to claim 1, characterized in that: The adsorption rod (1) is inserted to a position 200-300 mm from the bottom of the middle bag.

3. The tundish inclusion adsorbing device according to claim 1, characterized in that: The cap hole is circular with a diameter of 250-350 mm; the adsorption rod is cylindrical with a diameter of 200-300 mm.

4. The tundish inclusion adsorbing device according to claim 1, characterized in that: The groove is a rectangular groove.

5. The intermediate package impurity adsorption device according to any one of claims 1-4, characterized in that: The intermediate bag (3) has slag retaining walls (8) on both sides inside; the bag cover hole is located in the area between the two slag retaining walls (8).

6. The tundish inclusion adsorbing device according to claim 5, characterized in that: The cover hole is provided in at least two parts, distributed in the area between the two slag retaining walls (8).

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